WO2020196475A1 - 抗her2抗体-ピロロベンゾジアゼピン誘導体コンジュゲート - Google Patents
抗her2抗体-ピロロベンゾジアゼピン誘導体コンジュゲート Download PDFInfo
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Definitions
- the present invention relates to a novel anti-HER2 antibody and an antibody-drug conjugate containing the antibody.
- ADC Antibody-Drug Conjugate
- ADC is used in cancer treatment and the like. For example, it binds to an antigen expressed on the surface of cancer cells, and the binding internalizes the antigen into the cell.
- a drug having cytotoxic activity is bound to an antibody that can be produced.
- the ADC can be expected to accumulate the drug in the cancer cell and kill the cancer cell by being able to efficiently deliver the drug to the cancer cell.
- One of the useful drugs used in ADC is pirorobenzodiazepine (PBD).
- PBD exhibits cytotoxicity by binding to the PuGPu sequence of the DNA groove. Anthramycin, a naturally occurring PBD, was first discovered in 1965, and since then, various naturally occurring PBDs and their analogs have been discovered (Non-Patent Documents 1 to 4).
- the general structural formula of PBD is as follows
- HER2 Human epidermal growth factor receptor 2
- Non-Patent Documents 7 to 12 Human epidermal growth factor receptor 2
- HER2 is overexpressed in various cancer types such as breast cancer and gastric cancer (Non-Patent Documents 13 to 18), and has been reported to be a negative prognostic factor in breast cancer (Non-Patent Documents 19 and 20).
- Trastuzumab, cadosila, pertuzumab, lapatinib and the like are known as effective anti-HER2 drugs for HER2 overexpressing cancer.
- the responsiveness, strength of activity, and scope of application are still insufficient, and there is an unsatisfied need to target HER2.
- the present invention provides a novel anti-HER2 antibody, a conjugate of the antibody-pyrorobenzodiazepine (PBD) derivative, and a novel PBD derivative.
- the present invention also provides a pharmaceutical composition containing an anti-HER2 antibody and an anti-HER2 antibody-PBD derivative conjugate having antitumor activity, and a novel PBD derivative.
- the present invention provides a method for treating cancer using an anti-HER2 antibody, an anti-HER2 antibody-PBD derivative conjugate, and a novel PBD derivative.
- the present inventors have found that a novel anti-HER2 antibody-pyrrolobenzodiazepine (PBD) derivative conjugate has strong antitumor activity, and completed the present invention. That is, the present invention relates to the following.
- PBD anti-HER2 antibody-pyrrolobenzodiazepine
- m 1 indicates an integer of 1 or 2
- D is one of the following groups
- L is a linker that links D with a sugar chain (N297 sugar chain) that binds to Asn297 of Ab.
- N297 glycans may be remodeled Ab was substituted with CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, the amino acid sequence shown in SEQ ID NO: 3, or one to several amino acids in the amino acid sequence.
- the heavy chain containing CDRH3 consisting of the amino acid sequence
- CDRL1 consisting of the amino acid sequence shown in SEQ ID NO: 5
- CDRL2 consisting of the amino acid sequences shown in amino acid numbers 1 to 3 of SEQ ID NO: 6, and the amino acid sequence shown in SEQ ID NO: 7.
- it indicates that it is an antibody that specifically binds to HER2 or a functional fragment of the antibody, which comprises a light chain containing CDRL3 consisting of an amino acid sequence in which one to several amino acids of the amino acid sequence are substituted.
- B is a 1,4-phenyl group, a 2,5-pyridyl group, a 3,6-pyridyl group, a 2,5-pyrimidyl group or a 2,5-thienyl group.
- the antibody-drug conjugate according to [3], indicating that [5] D is the antibody-drug conjugate according to any one of [1] to [4], which is selected from the following groups;
- the antibody comprises a heavy chain containing CDRH1, CDRH2 and CDRH3 according to the following (a) to (c), and a light chain containing CDRL1, CDRL2 and CDRL3 [1] to [5].
- the antibody-drug conjugate according to any one of the above; (A) From CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 4, and the amino acid sequence shown in SEQ ID NO: 5.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6 and CDRL3 consisting of the amino acid sequences set forth in SEQ ID NO: 8.
- B From CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 3, and the amino acid sequence shown in SEQ ID NO: 5.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6, CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 8, or (C) From CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 3, and the amino acid sequence shown in SEQ ID NO: 5.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6, and CDRL3 consisting of the amino acid sequences set forth in SEQ ID NO: 7.
- the antibody consists of a heavy chain variable region consisting of an amino acid sequence selected from the group consisting of the following (a) to (d) and an amino acid sequence selected from the group consisting of (e) to (i).
- C An amino acid sequence having at least 95% or more homology to the sequence of the framework region other than each CDR sequence in the sequence of (a) or (b).
- (D) Amino acid sequences in which one or several amino acids have been deleted, substituted or added in the sequences of framework regions other than each CDR sequence in the sequence of (a) or (b), and (E) The amino acid sequence set forth in SEQ ID NO: 21, (F) The amino acid sequence set forth in SEQ ID NO: 25, (G) The amino acid sequence shown in SEQ ID NO: 29, (H) Amino acid sequences having at least 95% or more homology to the sequences of framework regions other than each CDR sequence in the sequences of (e) to (g), and (I) An amino acid sequence in which one or several amino acids are deleted, substituted or added in the sequence of the framework region other than each CDR sequence in the sequences of (e) to (g).
- A A heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 17 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 25,
- B A heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 13 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 29, or
- C A heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 13 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 21.
- the heavy chain constant region of the antibody is the heavy chain constant region of human IgG1, and in the heavy chain constant region, leucine at positions 234 and 235 indicated by the EU Index is replaced with alanine [11].
- A A heavy chain consisting of the amino acid sequences set forth in amino acid numbers 20 to 469 of SEQ ID NO: 15 and a light chain consisting of the amino acid sequences set forth in amino acid numbers 21 to 234 of SEQ ID NO: 23 (H01L02).
- B A heavy chain consisting of the amino acid sequences set forth in amino acid numbers 20 to 469 of SEQ ID NO: 11 and a light chain consisting of the amino acid sequences set forth in amino acid numbers 21 to 234 of SEQ ID NO: 27 (HwtL05).
- the antibody is N-linked glycosylation, O-linked glycosylation, N-terminal processing, C-terminal processing, deamidation, aspartic acid isomerization, methionine oxidation, methionine at N-terminal. Containing one or more modifications selected from the group consisting of addition of residues, amidation of proline residues, and deletion of one or two amino acid residues at the carboxyl ends of the heavy chain [1] to The antibody-drug conjugate according to any one of [14]. [16] The antibody-drug conjugate according to [15], wherein one or several amino acid residues are deleted at the carboxyl end of the heavy chain of the antibody.
- the N297 sugar chain is one of N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG having a structure represented by the following formula.
- the wavy line indicates that it is bound to the antibody Asn297.
- L (PEG) in the N297 sugar chain shows -NH-CH 2 CH 2- (O-CH 2 CH 2 ) n 5- *,
- n 5 indicates that it is an integer of 2 to 5, and the amino group at the left end is the non-reducing end on the 1-3 chain side or / and the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain. It is bonded to the carboxylic acid at the 2-position of sialic acid via an amide bond, and the asterisk (*) at the right end is bonded to the nitrogen atom at the 1- or 3-position on the triazole ring of Z 1 in L. Show that. [21] The antibody-drug conjugate according to [20], wherein n 5 is 3. [22] The following equation;
- m 1 is an integer of 1 or 2.
- Ab was substituted with CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, the amino acid sequence shown in SEQ ID NO: 3, or one to several amino acids in the amino acid sequence.
- N297 sugar chain is N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG having a structure represented by the following formula.
- the wavy line indicates that it is bound to the antibody Asn297
- L (PEG) in the N297 sugar chain is -NH-CH 2 CH 2- (O-CH 2 CH 2 ) 3- *.
- the amino group at the left end forms an amide bond with the carboxylic acid at the 2-position of the non-reducing terminal sialic acid on the 1-3 chain side or / and the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain.
- the asterisk (*) at the right end indicates that it is bound to the nitrogen atom at the 1st or 3rd position on the triazole ring in the above structural formula).
- m 1 is an integer of 1 or 2.
- Ab was substituted with CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, the amino acid sequence shown in SEQ ID NO: 3, or one to several amino acids in the amino acid sequence.
- N297 sugar chain is N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG having a structure represented by the following formula.
- the wavy line indicates that it is bound to the antibody Asn297
- L (PEG) in the N297 sugar chain is -NH-CH 2 CH 2- (O-CH 2 CH 2 ) 3- *.
- the amino group at the left end forms an amide bond with the carboxylic acid at the 2-position of the non-reducing terminal sialic acid on the 1-3 chain side or / and the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain.
- the asterisk (*) at the right end indicates that it is bound to the nitrogen atom at the 1st or 3rd position on the triazole ring in the above structural formula).
- m 1 is an integer of 1 or 2.
- Ab was substituted with CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, the amino acid sequence shown in SEQ ID NO: 3, or one to several amino acids in the amino acid sequence.
- N297 sugar chain is N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG having a structure represented by the following formula.
- the wavy line indicates that it is bound to the antibody Asn297
- L (PEG) in the N297 sugar chain is -NH-CH 2 CH 2- (O-CH 2 CH 2 ) 3- *.
- the amino group at the left end forms an amide bond with the carboxylic acid at the 2-position of the non-reducing terminal sialic acid on the 1-3 chain side or / and the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain.
- the asterisk (*) at the right end indicates that it is bound to the nitrogen atom at the 1st or 3rd position on the triazole ring in the above structural formula).
- m 1 is an integer of 1 or 2.
- Ab was substituted with CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, the amino acid sequence shown in SEQ ID NO: 3, or one to several amino acids in the amino acid sequence.
- N297 sugar chain is N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG having a structure represented by the following formula.
- the wavy line indicates that it is bound to the antibody Asn297
- L (PEG) in the N297 sugar chain is -NH-CH 2 CH 2- (O-CH 2 CH 2 ) 3- *.
- the amino group at the left end forms an amide bond with the carboxylic acid at the 2-position of the non-reducing terminal sialic acid on the 1-3 chain side or / and the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain.
- the asterisk (*) at the right end indicates that it is bound to the nitrogen atom at the 1st or 3rd position on the triazole ring in the above structural formula).
- the antibody is a heavy chain containing CDRH1 consisting of the amino acid sequence set forth in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence set forth in SEQ ID NO: 2, and CDRH3 consisting of the amino acid sequence set forth in SEQ ID NO: 4, and SEQ ID NO: It comprises a light chain containing CDRL1 consisting of the amino acid sequence set forth in 5; CDRL2 consisting of the amino acid sequences set forth in amino acids 1-3 of SEQ ID NO: 6 and CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 8 [22. ] To [25].
- the antibody-drug conjugate according to any one of.
- the antibody is a heavy chain containing CDRH1 consisting of the amino acid sequence set forth in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence set forth in SEQ ID NO: 2, and CDRH3 consisting of the amino acid sequence set forth in SEQ ID NO: 3, and SEQ ID NO: It comprises a light chain containing CDRL1 consisting of the amino acid sequence set forth in 5; CDRL2 consisting of the amino acid sequences set forth in amino acids 1-3 of SEQ ID NO: 6 and CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 8 [22. ] To [25].
- the antibody-drug conjugate according to any one of.
- the antibody is a heavy chain containing CDRH1 consisting of the amino acid sequence set forth in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence set forth in SEQ ID NO: 2, and CDRH3 consisting of the amino acid sequence set forth in SEQ ID NO: 3, and SEQ ID NO: It comprises a light chain containing CDRL1 consisting of the amino acid sequence set forth in 5; CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6 and CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 7 [22. ] To [25].
- the antibody-drug conjugate according to any one of.
- the antibody comprises a heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 17 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 25.
- the antibody-drug conjugate according to any one.
- the antibody comprises a heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 13 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 21.
- the antibody-drug conjugate according to any one.
- the antibody comprises a heavy chain consisting of the amino acid sequences set forth in amino acid numbers 20 to 469 of SEQ ID NO: 15 and a light chain consisting of the amino acid sequences set forth in amino acid numbers 21 to 234 of SEQ ID NO: 23 [22] to The antibody-drug conjugate according to any one of [26] and [29].
- the antibody comprises a heavy chain consisting of the amino acid sequences set forth in amino acid numbers 20 to 469 of SEQ ID NO: 11 and a light chain consisting of the amino acid sequences of amino acid numbers 21 to 234 of SEQ ID NO: 27 [22] to The antibody-drug conjugate according to any one of [25], [27] and [30].
- the antibody comprises a heavy chain consisting of the amino acid sequences set forth in amino acids 20 to 469 in SEQ ID NO: 11 and a light chain consisting of the amino acid sequences set forth in amino acids 21 to 234 in SEQ ID NO: 32 [22] to The antibody-drug conjugate according to any one of [25], [28] and [31].
- the antibody comprises a heavy chain consisting of the amino acid sequences set forth in amino acid numbers 20 to 469 in SEQ ID NO: 31 and a light chain consisting of the amino acid sequences set forth in amino acid numbers 21 to 234 in SEQ ID NO: 32, [22] to The antibody-drug conjugate according to any one of [25], [28] and [31].
- the antibody is N-linked glycosylation, O-linked glycosylation, N-terminal processing, C-terminal processing, deamidation, aspartic acid isomerization, methionine oxidation, methionine at N-terminal.
- CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1
- CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2
- amino acid sequence shown in SEQ ID NO: 3 or one to several amino acids in the amino acid sequence were substituted.
- the heavy chain containing CDRH3 consisting of the amino acid sequence CDRL1 consisting of the amino acid sequence set forth in SEQ ID NO: 5
- CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6, and the amino acid sequence set forth in SEQ ID NO: 7.
- an antibody that specifically binds to HER2 or a functional fragment of the antibody which comprises a light chain containing CDRL3 consisting of an amino acid sequence in which one to several amino acids of the amino acid sequence are substituted.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6, CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 8, or (B) From CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 3, and the amino acid sequence shown in SEQ ID NO: 5.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6, and CDRL3 consisting of the amino acid sequences set forth in SEQ ID NO: 8.
- a heavy chain variable region consisting of an amino acid sequence selected from the following groups (a) to (e) and a light chain variable region consisting of an amino acid sequence selected from the groups (f) to (k) below.
- (D) Amino acid sequences in which one or several amino acids have been deleted, substituted or added in the sequences of framework regions other than each CDR sequence in the sequence of (a) or (b), and (E) The amino acid sequence set forth in SEQ ID NO: 25, (F) The amino acid sequence set forth in SEQ ID NO: 29, (G) An amino acid sequence having at least 95% homology to the sequence of the framework region other than each CDR sequence in the sequence of (e) or (f), and of (h) (e) or (f). An amino acid sequence in which one or several amino acids are deleted, substituted, or added in a sequence of a framework region other than each CDR sequence in the sequence.
- [40] The antibody according to [39] or a functional fragment of the antibody, which comprises the heavy chain variable region and the light chain variable region according to (a) or (b) below; (A) A heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 17 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 25, or (B) A heavy chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 13 and a light chain variable region consisting of the amino acid sequence set forth in SEQ ID NO: 29. [41] The antibody according to any one of [37] to [40], which is a chimeric antibody or a human antibody, or a functional fragment of the antibody.
- the heavy chain constant region is the heavy chain constant region of human IgG1, and in the heavy chain constant region, leucine at positions 234 and 235 indicated by the EU Index is replaced with alanine, according to [43].
- Antibody or functional fragment of the antibody is the heavy chain constant region of human IgG1, and in the heavy chain constant region, leucine at positions 234 and 235 indicated by the EU Index is replaced with alanine, according to [43].
- [52] It is characterized by including a step of culturing the host cell according to any one of [49] to [51] and a step of collecting a target antibody from the culture obtained in the step.
- step ii) The step of treating the antibody obtained in step i) with a hydrolase to produce (Fuc ⁇ 1,6) GlcNAc-antibody, and iii) A sugar chain donor molecule obtained by introducing a PEG linker having an azide group into the carbonyl group of the carboxylic acid at the 2-position of sialic acid in MSG (9) or SG (10) and oxazolylation at the reducing end.
- a method for producing a sugar chain remodeling antibody which comprises a step of reacting a (Fuc ⁇ 1,6) GlcNAc-antibody in the presence of a glycosyltransferase.
- [59] The production method according to [58], further comprising a step of purifying the (Fuc ⁇ 1,6) GlcNAc-antibody by purifying the reaction solution of step ii) with a hydroxyapatite column.
- a sugar chain remodeling antibody which is obtained by the production method according to [58] or [59].
- An antibody-drug conjugate which is obtained by the production method according to [60].
- Antibodies-drug conjugates described in. [67] The antibody-drug conjugate according to any one of [1] to [36] and [62] to [66], or [37] to [47], [53] to [57] and A pharmaceutical composition comprising the antibody according to any one of [60] or a functional fragment of the antibody. [68] The pharmaceutical composition according to [67], which is an antitumor agent. [69] The pharmaceutical composition according to [68], wherein the tumor expresses HER2.
- novel anti-HER2 antibody-pyrorobenzodiazepine (PBD) derivative conjugate provided by the present invention is useful as an antitumor agent because it has excellent antitumor activity and safety.
- novel HER2 antibody of the present invention recognizes or binds to the antigen expressed in tumor cells, and is therefore useful as an antibody for the conjugate.
- FIG. 1 It is a schematic representation of the antibody-drug conjugate (molecule of (I)) of the present invention.
- A) is drug D
- (b) is linker L
- (c) is N 3- L (PEG)-
- (d) is N297 sugar chain (where the white oval is NeuAc (Sia), white six The square represents Man, the filled hexagon represents GlcNAc, the white rhombus represents Gal, and the white inverted triangle represents Fuc).
- the alkyne structure in the azide group (black teardrop type) in (c) and the spacer (white semicircle) in (b) react to form a triazole ring.
- the Y-shape represents antibody Ab.
- the N297 sugar chain is displayed as N297- (Fuc) MSG for convenience, and a PEG linker (N 3- L (PEG)-) having an azide group only in one branched chain of each N297 sugar chain is used.
- N297- (Fuc) MSG for convenience
- PEG linker N 3- L (PEG)-
- N297- (Fuc) SG shows an embodiment in which it has bound sialic acid and does not have sialic acid at the non-reducing end of the other branched chain
- N297- (Fuc) SG by adopting N297- (Fuc) SG, the non-reducing end of both branched chains is used.
- It may also have an embodiment having sialic acid to which a PEG linker having an azide group is bound. Unless otherwise stated, such labeling methods apply throughout this specification.
- FIG. 3A shows the process of producing a homogeneous (Fuc ⁇ 1,6) GlcNAc-antibody (II) by treating the heterogeneous N297 sugar chain of (IV) with a hydrolase such as EndoS.
- Figure 3B shows GlcNAc of the N297 sugar chain of antibody (II) by glycan transfer of the sugar chain of the MSG type sugar chain donor molecule using a glycosyltransferase such as EndoS D233Q / Q303L variant.
- (III) shows the process of producing the MSG-type sugar chain remodeling antibody.
- the MSG-type sugar chain donor molecule used here is a sialic acid at the non-reducing end of MSG modified with a PEG linker having an azide group, and the MSG-type N297 sugar chain remodeling antibody produced is also shown in the figure. As explained in 2B, the non-reducing terminal sialic acid is similarly modified.
- MSG is displayed as a donor molecule for convenience, but by using SG (10) as a sugar chain donor, the remodeling antibody of (III) has an azide group at both non-reducing ends of the N297 sugar chain.
- a sugar chain remodeling antibody to which a linker molecule having the above is bound is synthesized.
- the amino acid sequences (SEQ ID NOs: 1 to 3) of CDRH1 to 3 of the Trastuzumab A1, A2 and HwtL05 antibody heavy chains (Hwt) are shown.
- the amino acid sequences (SEQ ID NOs: 1, 2 and 4) of CDRH1 to 3 of the H01L02 antibody heavy chain (H01) are shown.
- the amino acid sequences of CDRL1 to 3 of the light chains of Trastuzumab A1 and A2 (Amino acid sequences 5 and 6 (amino acid sequences shown in amino acid numbers 1 to 3), 7) are shown.
- the amino acid sequences of CDRL1 to 3 (SEQ ID NOs: 5,6,8) of the H01L02 antibody and the HwtL05 antibody light chain (L02, L05) are shown.
- the amino acid sequence (SEQ ID NO: 11) of the heavy chain (Hwt) of Trastuzumab A1 is shown.
- the amino acid sequences (SEQ ID NO: 13) of the heavy chain variable region of A1, A2 and HwtL05 are shown.
- the underline in the amino acid sequence indicates the CDR sequence.
- the amino acid sequence (SEQ ID NO: 15) of the H01L02 antibody heavy chain (H01) is shown.
- the amino acid sequence (SEQ ID NO: 17) of the heavy chain variable region of the H01L02 antibody is shown.
- the underline in the amino acid sequence indicates the CDR sequence.
- the amino acid sequence (SEQ ID NO: 19) of the light chain (Lwt) of Trastuzumab A1 is shown.
- the amino acid sequences of the light chain variable regions of Trastuzumab A1 and A2 (SEQ ID NO: 21) are shown.
- the underline in the amino acid sequence indicates the CDR sequence.
- the amino acid sequence (SEQ ID NO: 23) of the H01L02 antibody light chain (L02) is shown.
- the amino acid sequence (SEQ ID NO: 25) of the light chain variable region of the H01L02 antibody is shown.
- the underline in the amino acid sequence indicates the CDR sequence.
- the amino acid sequence (SEQ ID NO: 27) of the HwtL05 antibody light chain (L05) is shown.
- the amino acid sequence (SEQ ID NO: 29) of the light chain variable region of the HwtL05 antibody is shown.
- the underline in the amino acid sequence indicates the CDR sequence.
- the effects of anti-HER2-antibody-drug conjugate ADC1 and ADC2 on CFPAC-1 cells, which are subcutaneously transplanted human pancreatic cancer lines, are shown.
- the amino acid sequence of the heavy chain of Trastuzumab A2 (SEQ ID NO: 31) is shown.
- the amino acid sequence of the light chain of Trastuzumab A2 (SEQ ID NO: 32) is shown.
- the effect of anti-HER2-antibody-drug conjugate ADC5 on KPL-4 cells, which is a subcutaneously transplanted human breast cancer strain, is shown.
- the anti-HER2-antibody-drug conjugate of the present invention is an anti-tumor drug in which an anti-tumor compound is bound to an antibody capable of recognizing or binding to an antigen expressed in tumor cells via a linker structure portion. is there.
- the antibody-drug conjugate of the present invention has the following formula
- m 1 is an integer of 1 or 2 (preferably 1), D is the drug, L is the linker linking the N297 sugar chain to D, Ab is the antibody or functional fragment of the antibody, and the N297 sugar chain is the antibody.
- the sugar chain that binds to the side chain of Asn297 is shown.
- the N297 sugar chain may be a remodeled sugar chain.
- the drug D of the present invention is preferably an antitumor compound.
- a part or all of the linker of the antibody-drug conjugate of the present invention is cleaved in the tumor cell and the antitumor compound portion is released to exhibit an antitumor effect.
- the drug or PBD derivative in the antibody-drug conjugate of the present invention is any one selected from the following group.
- the PBD derivative of the present invention has an asymmetric carbon at the 11'position, so that an optical isomer is present.
- the PBD derivatives of the present invention described above each contain an optical isomer and a mixture of the optical isomers in arbitrary proportions.
- the absolute configuration of the 11'position of the PBD derivative can be determined by X-ray crystal structure analysis of the crystalline product or intermediate or its derivative or by NMR such as Mosher method. At that time, the absolute configuration may be determined using a crystalline product or an intermediate derivatized with a reagent having an asymmetric center whose configuration is known.
- the stereoisomer can be obtained by isolating the synthesized compound according to the present invention, if desired, by using a usual optical resolution method or a separation method.
- the antibody-drug conjugate of the present invention includes optical isomers derived from stereoisomers or asymmetric carbon atoms, geometric isomers, tautomers or d-forms, l-forms, etc.
- Optical isomers such as atrop isomers may be present, but all of these isomers, optical isomers and mixtures thereof are included in the present invention.
- the above I (a) is preferable as the partial structure of the PBD derivative of the present invention. For example, any one selected from the following groups.
- the linker L of the present invention is a linker that links the N297 sugar chain and D.
- the asterisk (*) indicates that it is bound to the nitrogen atom at the N10'position of drug D, and Lb indicates the spacer that binds La to the N297 sugar chain or the remodeled N297 sugar chain.
- B represents a phenyl group or a heteroaryl group, preferably a 1,4-phenyl group, a 2,5-pyridyl group, a 3,6-pyridyl group, a 2,5-pyrimidyl group, or a 2,5-thienyl group. Yes, more preferably a 1,4-phenyl group.
- Lp indicates a linker consisting of an amino acid sequence that can be cleaved in vivo or in a target cell.
- Lp is cleaved by the action of enzymes such as esterase and peptidase, for example.
- Lp is a peptide residue composed of 2 to 7 (preferably 2 to 4) amino acids. That is, it is composed of oligopeptide residues in which 2 to 7 amino acids are peptide-bonded.
- the bond between the C-terminal of Lp and -NH- is cleaved by an enzyme such as esterase.
- the amino acid constituting Lp is not particularly limited, but is, for example, L- or D-amino acid, preferably L-amino acid.
- L-amino acids amino acids having a structure such as ⁇ -alanine, ⁇ -aminocaproic acid, and ⁇ -aminobutyric acid may be used, and further, unnatural amino acids such as N-methylated amino acids may be used. There may be.
- the amino acid sequence of Lp is not particularly limited, but the constituent amino acids include glycine (Gly; G), valine (Val; V), alanine (Ala; A), phenylalanine (Phe; F), and glutamic acid (Glu; E). , Isoleucine (Ile; I), Proline (Pro; P), Citrulin (Cit), Leucin (Leu; L), Serine (Ser; S), Lysine (Lys; K), Aspartic acid (Asp; D), etc. Can be mentioned. Of these, glycine (Gly; G), valine (Val; V), alanine (Ala; A), and citrulline (Cit) are preferable. These amino acids may overlap and have an amino acid sequence containing an arbitrarily selected amino acid. In addition, the pattern of drug release can be controlled by the type of amino acid.
- linker Lp As a specific example of the linker Lp, -GGVA-, -GG- (D-) VA-, -VA-, -GGFG-, -GGPI-, -GGVCit-, -GGVK-, -GG (D-) PI-, -GGPL-, -EGGVA, -PI-, -GGF-, -DGGF-, (D-) D-GGF-, -EGGF-, -SGGF-, -KGGF-, -DGGFG-, -GGFGG-, -DDGGFG-, -KDGGFG-,- GGFGGGF- Can be mentioned.
- the above "(D-) V” means D-valine
- (D-) P” means D-proline
- (D-) D” means D-aspartic acid.
- the linker Lp is preferably as follows. -GGVA-, -GG- (D-) VA-, -VA-, -GGFG-, -GGPI-, -GGVCit-, -GGVK-, -GG (D-) PI-, -GGPL-
- the linker Lp is more preferably as follows. -GGVA-, -GGVCit-, -VA-
- n 2 is an integer of 1 to 3 (preferably 1 or 2)
- n 3 is an integer of 1 to 5 (preferably an integer of 2 to 4, more preferably 2 or 4 -
- the spacer of Lb is not particularly limited, and examples thereof include a spacer represented by the following equation.
- the triazole ring site formed by the click reaction of the azide group and DBCO Dibenzocyclooctyne
- DBCO Dibenzocyclooctyne
- Lb Lb-1, Lb-2 or Lb-3 in L in the above is a mixture of either one or both of these two types of structures.
- B is a 1,4-phenyl group
- Z 2 is the structural formula shown below in Lb above:
- B is a 1,4-phenyl group.
- the free drug of the antibody-drug conjugate of the present invention is one selected from the following group.
- the free drug of the present invention is produced by cleaving the linker L portion of the antibody-drug conjugate after the antibody-drug conjugate of the present invention has migrated into the tumor cell.
- the free drug was confirmed to have an antitumor cell effect.
- the “gene” means a nucleotide or a nucleotide sequence containing a nucleotide sequence encoding an amino acid of a protein, or a complementary strand thereof, and for example, a nucleotide sequence or a nucleotide sequence containing a nucleotide sequence encoding an amino acid of a protein.
- the complementary strands such as polynucleotides, oligonucleotides, DNAs, mRNAs, cDNAs, and RNAs are included in the meaning of "gene”.
- HER2 gene examples include DNA, mRNA, cDNA, cRNA and the like containing a nucleotide sequence encoding the amino acid sequence of the HER2 protein.
- nucleotide refers to DNA, mRNA, cDNA, cRNA and the like containing a nucleotide sequence encoding the amino acid sequence of the HER2 protein.
- nucleotide refers to DNA, RNA, probe, oligonucleotide, polynucleotide, primer and the like.
- DNA, RNA, probe, oligonucleotide, polynucleotide, primer and the like are also “nucleotide” or "nucleotide sequence”. Is included in the meaning of.
- polypeptide refers to the HER2 protein.
- the "cell” also includes cells in an individual animal and cultured cells.
- cytodamaging activity means causing pathological changes in cells in some way, and is not limited to direct trauma, but also breaks DNA, forms dimers of bases, and forms chromosomes. It refers to causing any structural or functional damage to cells such as cleavage, damage to cell division devices, and decreased activity of various enzymes.
- the "epitope” means a partial peptide or partial three-dimensional structure (for example, a partial peptide or partial three-dimensional structure of HER2) of an antigen to which a specific antibody (for example, an anti-HER2 antibody) binds.
- the epitope of the partial peptide eg, partial peptide of HER2
- CDR in the present invention means a complementarity determining region (CDR). It is known that the heavy chain and the light chain of the antibody molecule each have three CDRs. CDRs, also called hypervariable regions, are sites within the variable regions of the heavy and light chains of an antibody that have particularly high primary structural variability, and are heavy and light chain polypeptide chains. In the primary structure, each is separated into three places.
- the CDR of the antibody is referred to as CDRH1, CDRH2, and CDRH3 from the amino-terminal side of the heavy chain amino acid sequence
- CDRL1 from the amino-terminal side of the light chain amino acid sequence.
- CDRL2 CDRL3.
- hybridizing under stringent conditions means hybridizing at 68 ° C. in a commercially available hybridization solution ExpressHyb Hybridization Solution (Clontech), or using a DNA-fixed filter 0.7. After hybridization at 68 ° C in the presence of -1.0M NaCl, wash at 68 ° C using a 0.1-2 times concentrated SSC solution (1x concentration SSC consists of 150 mM NaCl and 15 mM sodium citrate). It refers to hybridization under conditions that can be identified by the above or equivalent conditions.
- “1 to several” means 1 to 10, 1 to 9, 1 to 8, 1 to 7, 1 to 6, 1 to 5, 1 to 4, 1 to 1. Means 3 or 1-2 pieces.
- an antibody that recognizes or binds to HER2 may be labeled as an "anti-HER2 antibody”.
- anti-HER2 antibody Such antibodies include chimeric antibodies, humanized antibodies, human antibodies and the like.
- the binding property of the antibody to tumor cells can be confirmed by using flow cytometry.
- the uptake of the antibody into the tumor cell is as follows: (1) An assay in which the antibody taken up into the cell is visualized with a fluorescence microscope using a secondary antibody (fluorescent label) that binds to the therapeutic antibody (Cell Death and Differentiation (2008)).
- high endogenous ability means the viability of a target antigen-expressing cell (for example, HER2-expressing cell) to which the antibody and a saporin-labeled anti-mouse or rat IgG antibody are added (cell viability when no antibody is added). Is expressed as a relative ratio with 100%), which means that it is preferably 70% or less, more preferably 60% or less.
- anti-HER2 antibody used in the present invention will be described below. It should be noted that the embodiments described below show an example of typical embodiments of the present invention, and the scope of the present invention is not narrowly interpreted by this.
- the human HER2 protein is composed of a signal sequence consisting of 22 amino acid residues at the N-terminal, an extracellular domain consisting of 630 amino acid residues, a transmembrane domain consisting of 23 amino acid residues, and an intracellular domain consisting of 580 amino acid residues. ..
- the amino acid sequence and DNA sequence of human HER2 are published on public databases and can be referred to by accession numbers such as M11730 (Genbank) and NP_004439.2 (NCBI).
- the anti-HER2 antibody of the present invention is an antibody that can target tumor cells, that is, it has the property of being able to recognize tumor cells, the property of being able to bind to tumor cells, and the property of being taken up and internalized in tumor cells. ing. Therefore, the anti-HER2 antibody of the present invention and a compound having antitumor activity can be bound via a linker to form an antibody-drug conjugate.
- the anti-HER2 antibody of the present invention may have antitumor activity.
- the anti-HER2 antibody of the present invention can be obtained by immunizing an animal with a polypeptide as an antigen and collecting and purifying the antibody produced in vivo by using a method usually practiced in this field. Further, according to the above-mentioned known method, a hybridoma can be established by fusing an antibody-producing cell that produces an antibody against an antigen and a myeloma cell to obtain a monoclonal antibody.
- the anti-HER2 antibody of the present invention preferably has the following characteristics. (1) An antibody characterized by having the following characteristics (a) and (b); (A) Recognize or combine HER2.
- the antibody of the present invention recognizes HER2. In other words, the antibodies of the invention bind to HER2.
- the antibody of the present invention preferably binds to HER2, more preferably specifically to HER2.
- "specific recognition" that is, “specific binding” means a binding that is not a non-specific adsorption.
- KD dissociation constant
- the KD value of the preferred antibody of the present invention for HER2 is 1 ⁇ 10 -5 M or less, 5 ⁇ 10 -6 M or less, 2 ⁇ 10 -6 M or less or 1 ⁇ 10 -6 M or less, more preferably 5 ⁇ . 10-7 M or less, 2 x 10-7 M or less, or 1 x 10-7 M or less.
- the binding between the antigen and the antibody in the present invention can be measured or determined by an ELISA method, an RIA method, a Surface Plasmon Resonance (hereinafter referred to as “SPR”) analysis method, or the like.
- SPR Surface Plasmon Resonance
- the binding between the antigen and the antibody expressed on the cell surface can be measured by a flow sertometry method or the like.
- the anti-HER2 antibody of the present invention is not particularly limited as long as it is an antibody that recognizes or binds to HER2, but is preferably an antibody specified by the amino acid sequence shown in the sequence listing of the present application.
- the method for obtaining the anti-HER2 monoclonal antibody of the present invention usually goes through the following steps, but is not limited thereto.
- Method using hybridoma (Method using hybridoma)
- myeloma for example, mouse myeloma SP2 / 0-ag14 cells
- D Cell fusion between antibody-producing cells and myeloma
- E Selection of hybridoma groups that produce the desired antibody
- F Division into single cell clones (cloning)
- G In some cases, culturing hybridomas to produce large quantities of monoclonal antibodies, or breeding animals transplanted with hybridomas.
- the monoclonal antibody competes for the binding of the anti-HER2 antibody to HER2 (that is, the monoclonal antibody interferes with the binding of the anti-HER2 antibody to HER2), the specific epitope of the specific epitope. Even if the sequence or structure has not been determined, it can be determined that the monoclonal antibody binds to the same epitope as the anti-HER2 antibody. When it is confirmed that the epitopes are the same, it is strongly expected that the monoclonal antibody has the same antigen-binding ability, biological activity and / or internalization activity as the anti-HER2 antibody.
- the antibody of the present invention includes a recombinant antibody artificially modified for the purpose of reducing heterologous antigenicity to humans, for example, a chimeric antibody, a humanized antibody, and a human antibody. Etc. are also included. These antibodies can be produced using known methods.
- a chimeric antibody examples include an antibody in which the variable region and the constant region of the antibody are different from each other, for example, a chimeric antibody in which the variable region of a mouse or rat-derived antibody is bonded to a human-derived constant region ( Proc.Natl.Acad.Sci.USA, 81,6851-6855, (1984), etc.).
- Humanized antibody As a humanized antibody, an antibody in which only the complementarity determining region (CDR) is incorporated into a human-derived antibody (Nature (1986) 321, p.522-525, etc.), CDR transplantation, etc.
- CDR complementarity determining region
- some framework amino acid residues were also transplanted into human antibodies (WO90 / 07861), and some CDR amino acid sequences were modified (WO2012 / 075881, WO2011 / 084496, US2018 / 0501692), antibodies humanized using gene conversion mutagenesis strategies (US5821337).
- the amino acid sequence of the CDR can be determined by a known method such as Kabat definition, Chothia definition, Abm definition, IMGT, etc., but the CDR in the present invention may be defined by any method.
- the humanized anti-HER2 antibody of the present invention include H01L02 antibody, HwtL05 antibody, Trastuzumab A1 (HwtLwt), and Trastuzumab A2.
- the anti-HER2 antibody of the present invention is not limited to a specific humanized antibody as long as it retains the CDR sequences of all six types of H01L02 antibody, HwtL05 antibody, Trastuzumab A1 (HwtLwt) or Trastuzumab A2 and has HER2 binding activity.
- CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1 (FIG. 4) of the sequence listing or an amino acid sequence in which one to several (preferably one or two) amino acids of the amino acid sequence are substituted.
- CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2 (FIG.
- the amino acid of amino acid No. 9 of SEQ ID NO: 3 in the sequence listing was replaced with the amino acid of amino acid No. 4 of SEQ ID NO: 7 of CDRH3 shown in SEQ ID NO: 4 (Fig. 5) of the sequence listing.
- CDRL3 shown in SEQ ID NO: 8 (Fig. 7) in the sequence listing can be exemplified.
- an antibody containing a heavy chain containing CDRH1, CDRH2, and CDRH3 of the present invention and a light chain containing CDRL1, CDRL2, and CDRL3 an antibody containing the following (a) and (b) can be exemplified.
- CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1
- CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2
- CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 4
- CDRL1 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6
- CDRL3 consisting of the amino acid sequences set forth in SEQ ID NO: 8.
- CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1
- CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2
- CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 3
- CDRL1 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6
- CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 8.
- C From CDRH1 consisting of the amino acid sequence shown in SEQ ID NO: 1, CDRH2 consisting of the amino acid sequence shown in SEQ ID NO: 2, CDRH3 consisting of the amino acid sequence shown in SEQ ID NO: 3, and the amino acid sequence shown in SEQ ID NO: 5.
- CDRL1, CDRL2 consisting of the amino acid sequences set forth in amino acid numbers 1 to 3 of SEQ ID NO: 6 and CDRL3 consisting of the amino acid sequence set forth in SEQ ID NO: 7 (Trastuzumab A1 or A2).
- the amino acid sequence shown in SEQ ID NO: 13 (FIG. 9) of the sequence listing and the amino acid sequence shown in SEQ ID NO: 17 (FIG. 11) of the sequence listing can be exemplified.
- the amino acid sequence shown in SEQ ID NO: 29 (Fig. 17) in the column table can be exemplified.
- humanized antibody As a humanized antibody containing the combination of the heavy chain variable region and the light chain variable region described above, It comprises a heavy chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 17 (FIG. 11) of the sequence listing and a light chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 25 (FIG. 15) of the sequence listing.
- Humanized antibody (H01L02), It comprises a heavy chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 13 (FIG. 9) of the sequence listing and a light chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 29 (FIG. 17) of the sequence listing.
- Humanized antibody (HwtL05), It comprises a heavy chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 13 (FIG. 9) of the sequence listing and a light chain variable region consisting of the amino acid sequence shown in SEQ ID NO: 21 (FIG. 13) of the sequence listing.
- Humanized antibody (Trastuzumab A1 (HwtLwt), Trastuzumab A2), A humanized antibody comprising a light chain variable region consisting of the amino acid sequence shown in the above can be preferably exemplified.
- humanized antibody comprising a combination of a heavy chain containing the heavy chain variable region and a light chain containing the light chain variable region. From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 469 of SEQ ID NO: 15 (Fig. 10) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 23 (Fig. 14) in the sequence listing.
- Humanized antibody (H01L02) which comprises a light chain From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 469 of SEQ ID NO: 11 (Fig. 8) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 27 (Fig. 16) in the sequence listing.
- Humanized antibody which comprises a light chain From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 469 of SEQ ID NO: 11 (Fig. 8) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 19 (FIG. 12) of the sequence listing.
- Humanized antibody (Trastuzumab A1 (HwtLwt)), which comprises a light chain, and From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 469 of SEQ ID NO: 31 (Fig. 21) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 32 (Fig. 22) in the sequence listing.
- An exemplary humanized antibody (Trastuzumab A2) comprising the light chain.
- the carboxyl terminal of the heavy chain of the humanized antibodies H01L02, HwtL05, Trastuzumab A1 and Trastuzumab A2 may be deleted with one or two amino acids as described later, and the deleted product is also included in the present invention. ..
- Examples of the heavy chain of the deleted product include a heavy chain containing the amino acid sequences described in amino acid numbers 20 to 468 of SEQ ID NOs: 11, 15 and 31 in the sequence listing.
- the deletion From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 468 of SEQ ID NO: 15 (Fig. 10) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 23 (Fig. 14) in the sequence listing.
- Humanized antibody (H01L02), which comprises a light chain From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 468 of SEQ ID NO: 11 (Fig. 8) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 27 (Fig. 16) in the sequence listing.
- Humanized antibody (HwtL05), which comprises a light chain From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 468 of SEQ ID NO: 11 (Fig. 8) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 19 (Fig. 12) in the sequence listing.
- Humanized antibody (Trastuzumab A1 (HwtLwt)), which comprises a light chain, and From the heavy chain consisting of the amino acid sequences shown in amino acid numbers 20 to 468 of SEQ ID NO: 31 (Fig. 21) in the sequence listing and the amino acid sequences shown in amino acid numbers 21 to 234 of SEQ ID NO: 32 (Fig. 22) in the sequence listing.
- An exemplary humanized antibody (Trastuzumab A2) comprising the light chain.
- the amino acid sequence consisting of the 1st to 19th amino acid residues is a signal sequence.
- the amino acid sequence consisting of the 20th to 139th amino acid residues is the heavy chain variable region, and the amino acid sequence consisting of the 140th to 469th amino acid residues is the heavy chain constant region. It also consists of the 1st to 20th amino acid residues in the light chain amino acid sequence shown in SEQ ID NO: 19 (Fig. 12), 23 (Fig. 14), 27 (Fig. 16) or 32 (Fig. 22) in the sequence listing.
- the amino acid sequence is a signal sequence
- the amino acid sequence consisting of the 21st to 127th amino acid residues is the light chain variable region
- the amino acid sequence consisting of the 128th to 234th amino acid residues is the light chain constant region.
- the nucleotide sequence encoding the heavy chain amino acid sequence of the humanized antibody H01L02 is SEQ ID NO: 16, and the nucleotide sequence encoding the light chain amino acid sequence is SEQ ID NO: 24.
- the nucleotide sequence encoding the heavy chain amino acid sequence of the humanized antibody HwtL05 is SEQ ID NO: 12
- the nucleotide sequence encoding the light chain amino acid sequence is SEQ ID NO: 28
- the nucleotide sequence encoding the heavy chain amino acid sequence of the humanized antibody Trastuzumab A1 is the polynucleotide represented by SEQ ID NO: 12
- the nucleotide sequence encoding the light chain amino acid sequence is the polynucleotide represented by SEQ ID NO: 20.
- nucleotide sequence encoding the amino acid sequence of the heavy chain variable region of the humanized antibody H01L02 is SEQ ID NO: 18, and the nucleotide sequence encoding the amino acid sequence of the light chain variable region is SEQ ID NO: 26.
- the nucleotide sequence encoding the amino acid sequence of the heavy chain variable region of the humanized antibody HwtL05 is SEQ ID NO: 14
- the nucleotide sequence encoding the amino acid sequence of the light chain variable region is SEQ ID NO: 30
- the nucleotide sequence encoding the amino acid sequence of the heavy chain variable region of the humanized antibody Trastuzumab A1 is the polynucleotide represented by SEQ ID NO: 14
- the nucleotide sequence encoding the amino acid sequence of the light chain variable region is the polynucleotide represented by SEQ ID NO: 22.
- the nucleotide sequence consisting of the 1st to 57th nucleotides of each of the nucleotide sequences shown in SEQ ID NOs: 12 and 16 in the sequence listing encodes the signal sequence of the humanized antibody heavy chain, and starts from the 58th to 417th nucleotides.
- the nucleotide sequence is encoding the amino acid sequence of the humanized antibody heavy chain variable region, and the nucleotide sequence consisting of the nucleotides of the 418th to 1407th base sequences encodes the antibody heavy chain constant region.
- nucleotide sequence consisting of the 1st to 60th nucleotides of each of the nucleotide sequences shown in SEQ ID NOs: 20, 24, and 28 in the sequence listing encodes the signal sequence of the humanized antibody light chain, and is the 61st to 381st.
- the nucleotide sequence consisting of nucleotides encodes the amino acid sequence of the humanized antibody light chain variable region, and the nucleotide sequence consisting of nucleotides 382 to 702 encodes the antibody light chain constant region.
- an antibody preferably 90% or more, more preferably 95% or more, still more preferably 97% or more, and most preferably 99% or more is also included in the antibody of the present invention as long as it has HER2 binding activity. Further, it has a CDR having the same amino acid sequence as the CDR of the antibody comprising the combination of the heavy chain variable region and the light chain variable region or the antibody comprising the combination of the heavy chain and the light chain.
- the identity or homology of the amino acid sequence excluding the amino acid sequence of the CDR of the antibody is 80% or more, preferably 90% or more, more preferably 95% or more, still more preferably 97% or more, and most preferably 99%.
- the above-mentioned antibodies are also included in the antibodies of the present invention as long as they have HER2 binding activity. Furthermore, by combining an amino acid sequence in which one to several amino acid residues are substituted, deleted or added to the amino acid sequence of a heavy chain or a light chain, an antibody having the same biological activity as each of the above antibodies can be selected. It is possible to do. Further, as the amino acid substitution in the present specification, conservative amino acid substitution is preferable (WO2013154206 etc.).
- Conservative amino acid substitutions are substitutions that occur within a group of amino acids associated with the amino acid side chain. Such amino acid substitution is preferably carried out within a range that does not deteriorate the characteristics of the substance having the original amino acid sequence.
- the homology between the two amino acid sequences is Blast algorithm version 2.2.2 (Altschul, Stephen F., Thomas L. Madden, Alejandro A.Schaaffer, JinghuiZhang, ZhengZhang, Webb Miller, and David J. Lipman (1997), It can be determined by using the default parameters of "Gapped BLAST and PSI-BLAST: a new generation of protein database search programs", Nucleic Acids Res. 25: 3389-3402).
- the Blast algorithm can also be used by accessing it on the Internet (www.ncbi.nlm.nih.gov/blast).
- Human antibody Examples of the antibody of the present invention include a human antibody that binds to HER2.
- the anti-HER2 human antibody includes a human antibody having only the gene sequence of an antibody derived from a human chromosome.
- Anti-HER2 human antibodies can be obtained by known methods (Nature Genetics (1997) 16, p.133-143, Nucl. Acids Res.
- the chimeric antibody, humanized antibody, human antibody, etc. obtained by the above method can be evaluated for binding to an antigen by a known method or the like, and a suitable antibody can be selected.
- a suitable antibody can be selected.
- an index for comparing the properties of an antibody the stability of the antibody can be mentioned.
- Differential scanning calorimetry (DSC) is a device that can quickly and accurately measure the midpoint of heat denaturation (Tm), which is a good indicator of the relative structural stability of proteins. By measuring the Tm value using DSC and comparing the values, the difference in thermal stability can be compared.
- the storage stability of an antibody shows a certain degree of correlation with the thermal stability of an antibody (Pharmaceutical Development and Technology (2007) 12, p.265-273), and it is suitable using the thermal stability as an index.
- Antibodies can be selected.
- Other indicators for selecting antibodies include high yield in suitable host cells and low cohesiveness in aqueous solution. For example, the antibody with the highest yield does not always show the highest thermal stability, so it is necessary to make a comprehensive judgment based on the above-mentioned indicators and select the antibody most suitable for administration to humans. ..
- the antibody of the present invention also includes an "antibody that binds to the same site" as the anti-HER2 antibody provided by the present invention. That is, the present invention also includes an antibody that binds to a site on the HER2 protein recognized by the Trastuzumab A1 (HwtLwt), Trastuzumab A2, H10L02 antibody or H02L05 antibody of the present invention.
- the antibody of the present invention also includes a modified version of the antibody.
- the modified product means an antibody of the present invention that has been chemically or biologically modified.
- Chemical modifications include the binding of chemical moieties to the amino acid backbone, chemical modifications of N-linked or O-linked carbohydrate chains, and the like.
- Biological modifications are post-translational modifications (eg, N- or O-linked glycosylation, N-terminal or C-terminal processing, deamidation, aspartic acid isomerization, methionine oxidation). It also includes those with a methionine residue added to the N-terminal by expression using a prokaryotic host cell.
- those labeled to enable the detection or isolation of the antibody or antigen of the present invention for example, an enzyme-labeled substance, a fluorescent-labeled substance, and an affinity-labeled substance are also included in the meaning of such modified substances.
- Such a modified version of the antibody of the present invention is useful for improving the stability and retention of the antibody in blood, reducing the antigenicity, detecting or isolating the antibody or the antigen, and the like.
- antibody-dependent cellular cytotoxicity can be enhanced by regulating the sugar chain modification bound to the antibody of the present invention (glycosylation, defucose, etc.).
- WO1999 / 54342, WO2000 / 61739, WO2002 / 31140, WO2007 / 133855, WO2013 / 120066 and the like are known as techniques for regulating the sugar chain modification of an antibody, but the technique is not limited thereto.
- the antibody of the present invention also includes an antibody in which the sugar chain modification has been adjusted. Such modifications may be made at any position in the antibody or functional fragment thereof, or at any desired position, with the same or two or more different modifications at one or more positions. May be good.
- the "modified antibody fragment” also includes the "fragment of the modified antibody” in its meaning.
- an antibody gene When an antibody gene is once isolated and then introduced into an appropriate host to prepare an antibody, a combination of an appropriate host and an expression vector can be used.
- Specific examples of the antibody gene include a combination of a gene encoding the heavy chain sequence and the like of the antibody described in the present specification and a gene encoding the light chain sequence and the like.
- the heavy chain sequence gene and the like and the light chain sequence gene and the like When transforming a host cell, the heavy chain sequence gene and the like and the light chain sequence gene and the like can be inserted into the same expression vector, or can be inserted into different expression vectors. It is possible.
- animal cells, plant cells, and eukaryotic microorganisms can be used.
- animal cells include mammalian cells, for example, monkey cells, COS cells (Cell (1981) 23, p.175-182, ATCC CRL-1650), mouse fibroblasts NIH3T3 (ATCC No. CRL-1658).
- Chinese hamster ovary cells CHO cells, ATCC CCL-61) dihydrofolate reductase deficient strain (Proc.Natl.Acad.Sci.USA (1980) 77, p.4126-4220), FreeStyle 293F cells (Invitrogen) )
- prokaryotic cells for example, Escherichia coli and Bacillus subtilis can be mentioned.
- Antibodies can be obtained by introducing the antibody gene of interest into these cells by transformation and culturing the transformed cells in vitro.
- the yield may differ depending on the sequence of the antibody, and it is possible to select an antibody having the same binding activity that is easy to produce as a drug by using the yield as an index. Therefore, the antibody of the present invention is characterized by including a step of culturing the transformed host cell and a step of collecting a target antibody or a functional fragment of the antibody from the culture obtained in the step. The antibody obtained by the method for producing the antibody is also included.
- the antibody gene is preferably a polynucleotide containing the polynucleotide according to any one of (a) to (e) below.
- (A) A combination of a polynucleotide encoding the heavy chain amino acid sequence and a polynucleotide encoding the light chain amino acid sequence of any one of H1L02 antibody, HwtL05 antibody, Trastuzumab A1 (HwtLwt), and Trastuzumab A2
- H1L02 antibody HwtL05 antibody, Trastuzumab A1 (HwtLwt)
- Trastuzumab A2 a combination of a polynucleotide encoding a heavy chain amino acid sequence containing CDRH1 to CDRH3 and a polynucleotide encoding a light chain amino acid sequence containing CDRL1 to CDRL3.
- (C) A polynucleotide encoding a heavy chain amino acid sequence including an amino acid sequence of the heavy chain variable region of any one of H1L02 antibody, HwtL05 antibody, Trastuzumab A1 (HwtLwt), and Trastuzumab A2 and an amino acid sequence of the light chain variable region.
- Combination of polynucleotides encoding light chain amino acid sequence including (d) Hybrid with a nucleotide consisting of a polynucleotide complementary to the polynucleotide according to any one of (a) to (c) under stringent conditions.
- the present invention includes a nucleotide encoding the antibody of the present invention or a functional fragment thereof or a modified product thereof, a recombinant vector into which the gene is inserted, and a cell into which the gene or the vector has been introduced.
- the present invention also relates to a method for producing an antibody or a functional fragment thereof or a modified product thereof, which comprises a step of culturing the cells and a step of recovering the antibody or the functional fragment thereof or a modified product thereof from the culture. Including.
- the antibody according to the present invention also includes the modified antibody and a functional fragment of the antibody, and is aidated with a deletion substance lacking one or two amino acids at the heavy chain carboxyl terminal.
- the deletion product for example, a heavy chain in which the proline residue at the carboxyl terminal site is amidated
- the deletion of the carboxyl end of the heavy chain of the antibody according to the present invention is not limited to the above types.
- the two heavy chains constituting the antibody according to the present invention may be any one of the heavy chains selected from the group consisting of the full length and the above-mentioned deletion products, or a combination of the two. It may be a thing.
- the amount ratio of each deletion substance can be affected by the type of cultured mammalian cells producing the antibody according to the present invention and the culture conditions, but the main component of the antibody according to the present invention is carboxyl on both of the two heavy chains.
- the case where one amino acid residue at the end is deleted can be mentioned.
- Examples of the isotype of the anti-HER2 antibody of the present invention include IgG (IgG1, IgG2, IgG3, IgG4), and preferably IgG1, IgG2 or IgG4.
- IgG1 is used as the isotype of the antibody of the present invention
- the effector function can be adjusted by substituting a part of amino acid residues in the constant region.
- IgG1 mutant having reduced or attenuated effector function include IgG1 LALA (IgG1-L234A, L235A), IgG1 LAGA (IgG1-L235A, G237A), and the like, preferably IgG1 LALA.
- the L234A and L235A are ranked 234th and 235th specified by the EU index (Proc.Natl.Acad.Sci.USA, Vol.63, No.1 ( May 15,1969), p.78-85).
- Leucine replacement with alanine, G237A indicates the replacement of glycine at position 237 with alanine as specified by the EU index.
- the biological activity of an antibody includes antigen-binding activity, activity that is internalized in cells expressing the antigen by binding to the antigen, activity that neutralizes the activity of the antigen, and activity that enhances the activity of the antigen.
- the function of the antibody according to the present invention is an activity that binds to HER2, preferably an activity that is endogenous to HER2-expressing cells by binding to HER2.
- the obtained antibody can be purified to a uniform level.
- the separation and purification method used for ordinary proteins may be used.
- the antibody can be separated and purified by appropriately selecting and combining column chromatography, filter filtration, ultrafiltration, salting out, dialysis, polyacrylamide gel electrophoresis for preparation, isoelectric focusing, and the like (Strategies).
- Protein Purification and characterization A Laboratory Course Manual, Daniel R. Marshak et al.eds., Cold Spring Harbor Laboratory Press (1996); Antibodies: A Laboratory Manual. Ed Harlow and David Lane, Cold Spring Harbor Laboratory (1988))
- chromatography examples include affinity chromatography, ion exchange chromatography, hydrophobic chromatography, gel filtration chromatography, reverse phase chromatography, adsorption chromatography and the like. These chromatographies can be performed using liquid chromatography such as HPLC or FPLC.
- column used for affinity chromatography examples include a protein A column and a protein G column. It is also possible to purify an antibody by utilizing the binding property to an antigen using a carrier on which an antigen is immobilized.
- a hydrolase is used to excise the heterogeneous sugar chain added to the protein (antibody, etc.) leaving only the terminal GlcNAc, and then the uniform protein added with GlcNAc.
- Prepare the portion hereinafter referred to as "acceptor”
- an arbitrary sugar chain prepared separately is prepared (hereinafter referred to as “donor”), and the acceptor and the donor are ligated using a glycosyltransferase. This makes it possible to synthesize a uniform glycoprotein having an arbitrary sugar chain structure.
- the "sugar chain” means a structural unit in which two or more monosaccharides are bound by a glycosidic bond.
- Specific monosaccharides and sugar chains may be labeled as abbreviations, for example, "GlcNAc-" and "MSG-”.
- the oxygen atom or nitrogen atom belonging to the glycosidic bond with another structural unit at the reducing end is the abbreviation representing the sugar chain, unless otherwise specified. Displayed as not included.
- a monosaccharide as a basic unit of a sugar chain is, for convenience, in its ring structure, which is bonded to an oxygen atom constituting a ring and belongs to a hydroxyl group (or a glycosidic bond), unless otherwise specified.
- the carbon atom directly bonded to the oxygen atom is expressed as the 1st position (2nd position only in sialic acid).
- the name of the example compound is given as the whole chemical structure, and this rule does not necessarily apply.
- the partial structure when linked to a sugar chain in the side chain of an amino acid is expressed in parentheses, for example, "(SG-) Asn". Shall be.
- the antibody-drug conjugate of the present invention has the following formula.
- antibody Ab or a functional fragment thereof is bound to L from the N297 sugar chain or the remodeled N297 sugar chain, and preferably is bound to L from the remodeled N297 sugar chain of Ab. There is.
- the sugar chain of Ab in the present invention is an N-linked sugar chain or an O-linked sugar chain, and is preferably an N-linked sugar chain.
- the N-linked sugar chain is bound to the amino acid side chain of the antibody by N-glycosidic bond and the O-linked sugar chain is bound to the amino acid side chain of the antibody by O-glycosidic bond.
- IgG has an N-linked sugar chain well conserved at the 297th asparagine residue (hereinafter referred to as "Asn297 or N297") in the Fc region of the heavy chain, and contributes to the activity and kinetics of the antibody molecule. It is known to do (Biotechnol.Prog., 2012,28, 608-622, Anal.Chem., 2013,85,715-736).
- each amino acid is specified by the Eu number (Eu INDEX).
- Eu INDEX Eu INDEX
- Asn297 to which an N-linked sugar chain is added in the Fc region corresponds to the 297th position in the Eu number, and even if the actual amino acid position fluctuates due to molecular fragmentation or region deletion, the Eu number Amino acids are uniquely specified by displaying with.
- the antibody or a functional fragment thereof is bound to L from a sugar chain (hereinafter referred to as "N297 sugar chain”) that binds to the side chain of Asn297, and further.
- N297 sugar chain a sugar chain that binds to the side chain of Asn297
- the antibody or functional fragment thereof is bound to L from the N297 sugar chain, and the N297 sugar chain is a remodeled N297 sugar chain.
- SGP is an abbreviation for Sialyl GlycoPeptide and is a representative of N-linked complex sugar chains. From the yolk of a chicken egg, SGP can be isolated and purified, for example, according to the method described in WO2011 / 0278681. In addition, SGP refined products are commercially available (Tokyo Kasei Co., Ltd., Fushimi Pharmaceutical Co., Ltd.) and can be purchased. Disialooctasaccharide (Tokyo Kasei Co., Ltd.), which consists of only a sugar chain (hereinafter, “SG (10)”) lacking one GlcNAc at the reducing end in the sugar chain portion of SG, is commercially available.
- the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic acid at the non-reducing end is called MSG (9), and the 1-3 sugar chains of the branched chain are called MSG (9).
- MSG1 the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic acid at the non-reducing end
- MSG9 the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic acid at the non-reducing end
- MSG (9) the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic acid at the non-reducing end
- MSG (9) the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic acid at the non-reducing end
- MSG9 the sugar chain structure in which only one of the ⁇ -Man branched chains of SG (10) lacks sialic
- the remodeled sugar chains of the present invention are N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture of N297- (Fuc) MSG1 and N297- (Fuc) MSG2, or N297- (Fuc) SG.
- N297- (Fuc) MSG1, N297- (Fuc) MSG2 or N297- (Fuc) SG Preferably N297- (Fuc) MSG1, N297- (Fuc) MSG2 or N297- (Fuc) SG, and more preferably N297- (Fuc) MSG1 or N297- (Fuc) MSG2.
- N297- (Fuc) MSG1 is represented by the following structural formula or sequence formula.
- L (PEG) indicates -NH-CH 2 CH 2- (O-CH 2 CH 2 ) n 5- *, and the amino group at the left end is the 1-3 chain side of the ⁇ -Man branched chain of the N297 sugar chain. It is bonded to the carboxylic acid at the 2-position of sialic acid at the non-reducing end via an amide bond, and the asterisk (*) at the right end is the 1-position on the 1,2,3-triazole ring of Lb in the linker L. Or it indicates that it is bonded to the nitrogen atom at the 3-position,
- n 5 is an integer of 2 to 10, preferably an integer of 2 to 5.
- N297- (Fuc) MSG2 is represented by the following structural formula or sequence formula.
- L (PEG) indicates -NH-CH 2 CH 2- (O-CH 2 CH 2 ) n 5- *, and the amino group at the left end is the 1-6 chain side of the ⁇ -Man branched chain of the N297 sugar chain. It is bonded to the carboxylic acid at the 2-position of sialic acid at the non-reducing end via an amide bond, and the asterisk (*) at the right end is the 1-position on the 1,2,3-triazole ring of Lb in the linker L. Or it indicates that it is bonded to the nitrogen atom at the 3-position,
- n 5 is an integer of 2 to 10, preferably an integer of 2 to 5.
- N297- (Fuc) SG is represented by the following structural formula or sequence formula.
- L (PEG) indicates -NH-CH 2 CH 2- (O-CH 2 CH 2 ) n 5- *, and the amino group at the left end is the 1-3 chain side of the ⁇ -Man branched chain of the N297 sugar chain. It is bonded to the carboxylic acid at the 2-position of sialic acid at both non-reducing ends on the 1-6 chain side via an amide bond, and the asterisk (*) at the right end is 1,2, of Lb in the linker L. Indicates that it is bonded to the nitrogen atom at the 1st or 3rd position on the 3-triazole ring.
- n 5 is an integer of 2 to 10, preferably an integer of 2 to 5.
- N297 sugar chain of the antibody in the antibody-drug conjugate of the present invention is N297- (Fuc) MSG1 or N297- (Fuc) MSG2 or a mixture thereof
- the antibody is a dimer and therefore the antibody-drug conjugate.
- ADC1 is the case where the N297 sugar chain is N297- (Fuc) MSG1.
- N297 sugar chain of the antibody in the antibody-drug conjugate of the present invention is N297- (Fuc) SG
- the N297 sugar chain is preferably N297- (Fuc) MSG1 or N297- (Fuc) MSG2 or N297- (Fuc) SG, and more preferably N297- (Fuc) MSG1 or N297- (Fuc) MSG2. , Most preferably N297- (Fuc) MSG1. If the N297 sugar chain is N297- (Fuc) MSG1 or N297- (Fuc) MSG2 or N297- (Fuc) SG, a uniform quality ADC can be obtained.
- the present invention provides a method for producing a sugar chain remodeling antibody or a functional fragment of the antibody, which comprises the following steps i) to iii). i) A step of culturing the above-mentioned host cells (for example, animal cells (CHO cells, etc.)) and collecting the desired antibody from the obtained culture. ii) Step i) Treat the antibody obtained in step i) with a hydrolase to produce an antibody ((Fuc ⁇ 1,6) GlcNAc-antibody) whose N297 sugar chain is (Fuc ⁇ 1,6) GlcNAc (Fig. 3A).
- the reaction solution is further purified by a step including purification with a hydroxyapatite column to purify the (Fuc ⁇ 1,6) GlcNAc-antibody, and iii)
- a PEG linker- (N 3- L (PEG)) having an azide group is introduced into the carbonyl group of the carboxylic acid at the 2-position of sialic acid in MSG (9) or SG (10), and the reducing end is oxazoline.
- a step of reacting a converted sugar chain donor molecule with a (Fuc ⁇ 1,6) GlcNAc-antibody in the presence of glycosyltransferase to synthesize a sugar chain remodeling antibody in which an azide group is introduced into sialic acid (Fig. 3B).
- the present invention also includes a sugar chain remodeling antibody obtained by such a production method, a functional fragment thereof, or a modified product thereof.
- the production intermediate of this antibody-drug conjugate has an alkyne structure that reacts with an azide group such as DBCO (Dibenzocyclooctyne) (see Example 2-3). Therefore, the MSG1, MSG2 or SG type sugar chain remodeling antibody or the antibody in which the PEG linker having an azide group is introduced into the sialic acid of the sugar chain obtained in the steps i) to iii) of the production intermediate is introduced.
- the antibody-drug conjugate of the present invention can be produced by reacting with the functional fragment of.
- glcNAc- (Fuc ⁇ 1,6) GlcNAc) with fucose added at the reducing end is derived from an antibody produced in animal cells, and the sugar chain on the non-reducing end side is the MSG described above. (MSG1, MSG2) or those remodeled into a sugar chain structure similar to SG are preferable.
- the carboxylic acid bonded to the 2-position of sialic acid at the non-reducing end is used to bind to L (PEG).
- Such a sugar chain remodeling antibody having MSG (MSG1, MSG2) or SG type N297 sugar chain can be produced by the method shown in FIG.
- the N297 sugar chain has an N-linked sugar chain structure with fucose added as a basic structure.
- EndoS As the enzyme used for the hydrolysis reaction of the N297 sugar chain, EndoS or a mutant enzyme retaining its hydrolysis activity can be used.
- a sugar chain donor molecule having MSG (MSG1, MSG2) is adopted as the sugar chain.
- MSG1, MSG2 a sugar chain donor molecule having MSG
- Such a sugar chain is prepared in Example 3 using commercially available monosialo-Asn free (1S2G / 1G2S-10NC-Asn, GlyTech Research Institute Co., Ltd., hereinafter referred to as "(MSG-) Asn") as a raw material.
- (MSG-) Asn1 or (MSG2-) Asn can be used separately according to the described method, or can be used as a mixture without separation.
- a sugar chain donor molecule having SG (10) as a sugar chain is used for this glycosylation reaction.
- an SG (10) sugar chain for example, one obtained from SGP by hydrolysis or the like may be used, and an SG (10) sugar such as commercially available disialo octasaccharide (Tokyo Chemical Industry Co., Ltd.) may be used. Chains may be used.
- the MSG (MSG1, MSG2) or SG-type sugar chain contained in the donor molecule has a PEG linker (N 3- L (PEG)) containing an azide group at the 2-position of its sialic acid.
- GlcNAc at the reducing end of MSG (MSG1, MSG2) or SG type sugar chain contained in the donor molecule is, for example, oxazolined by 2-chloro-1,3-dimethyl-1H-benzimidazole-3-ium-chloride treatment. It is preferable to use one that has been activated in a similar manner (J. Org. Chem., 2009, 74 (5), 2210-2212.).
- EndoS D233Q is a variant in which the hydrolysis reaction is suppressed by substituting with Gln.
- the glycosyl rearrangement reaction using EndoS D233Q is described in WO2013 / 120066 and the like.
- a modified enzyme such as EndoS D233Q / Q303L in which a mutation is further added to EndoS D233Q may be used.
- the purification operation of an antibody after sugar chain remodeling (sugar hydrolysis and sugar chain transfer reaction) of the antibody is aimed at separation from the low molecular weight compound and enzyme used in the reaction, and such purification is usually performed.
- Gel filtration chromatography, ion exchange chromatography, affinity chromatography and the like are used, but additional purification with a hydroxyapatite column may be performed.
- the present invention provides a method for producing an antibody-drug conjugate, which comprises a step of purifying an intermediate from a reaction solution after sugar hydrolysis of an antibody, and further a step of purifying with a hydroxyapatite column.
- sugar chain remodeling reports JACS. 2012, 134, 12308-12318., Angelw. Chem.
- the reaction solution obtained by treating the antibody with a hydrolase was prepared as protein A. It is only purified by a column (affinity chromatography column), but this purification method cannot completely remove hydrolases (EndoS, etc.), and residual enzymes affect the next glycosyltransferase reaction. Turned out to give.
- the reaction solution obtained by treating the antibody with a hydrolase was purified in the order of protein A column and hydroxyapatite column (CHT column, Bio-Rad Laboratories, Inc.) to obtain the residual enzyme. The reaction efficiency of the next sugar chain transfer reaction was improved without any effect.
- the antibody-drug conjugate of the present invention is most preferably one antibody-drug conjugate selected from the following group.
- N297 sugar chain is either N297- (Fuc) MSG1, N297- (Fuc) MSG2 or a mixture thereof, or N297- (Fuc) SG (preferably N297- (Fuc) MSG1).
- L (PEG) indicates that it is -NH-CH 2 CH 2- (O-CH 2 CH 2 ) 3- *, and the amino group at the left end is 1-3 of the ⁇ -Man branched chain of the N297 sugar chain.
- linker L is bonded to the nitrogen atom at the 1- or 3-position on the triazole ring of Lb.
- "-(N297 sugar chain) -LD" in which the N297 sugar chain is bonded to the nitrogen atom at the 1-position on the triazole ring of Lb in L in one molecule of the conjugate.
- the anti-HER2 antibody or anti-HER2 antibody-drug conjugate of the present invention exhibits strong tumor activity (in vivo antitumor activity, in vitro anticellular activity), good pharmacokinetics and physical properties, and is highly safe. It is useful as.
- the number of drug bonds to one antibody molecule is an important factor affecting its efficacy and safety.
- the production of an antibody-drug conjugate is carried out by defining reaction conditions such as the amount of raw materials and reagents to be reacted so that the number of drug bonds is constant. What is a chemical reaction of a low molecular weight compound? Differently, it is usually obtained as a mixture of different numbers of drugs bound together.
- the number of drug bonds to one antibody molecule can be specified as an average value, that is, the average number of drug bonds (DAR: Drug to Antibody Ratio).
- the number of pirorobenzodiazepine derivatives bound to the antibody molecule is controllable, and the average number of drug bindings (DAR) per antibody can be in the range of 1 to 10, but preferably from 1. Eight, more preferably 1 to 5.
- DAR drug bindings
- the number of drug bindings m 2 per antibody molecule in the antibody-drug conjugate is 1 or 2. Is an integer of.
- the sugar chain is an N297 sugar chain and the sugar chain is a mixture of N297- (Fuc) MSG1, N297- (Fuc) MSG2 or N297- (Fuc) MSG1 and N297- (Fuc) MSG2, m 2 is 1.
- the DAR is in the range of 1-3 (preferably in the range of 1.0 to 2.5, more preferably in the range of 1.2 to 2.2 or 1.6 to 2.2).
- m 2 is 2 and DAR is in the range of 3 to 5 (preferably in the range of 3.2 to 4.8, more preferably in the range of 3.5 to 4.2). Is.
- a person skilled in the art can design a reaction that binds a required number of drugs to an antibody from the description of Examples of the present application, and can obtain an antibody in which the number of bindings of a pirorobenzodiazepine derivative is controlled.
- the antibody-drug conjugate, free drug or production intermediate of the present invention has a basic group such as an amino group
- it can be a pharmaceutically acceptable salt if desired.
- Such salts include, for example, hydrohalogenates such as hydrochlorides and hydroiodide; inorganic acid salts such as nitrates, perchlorates, sulfates and phosphates; methanesulfonates, trifluoromethanesulfones.
- Lower alkane sulfonates such as acid salts and ethane sulfonates; Allyl sulfonates such as benzene sulfonates and p-toluene sulfonates; formic acid, acetic acid, apple acid, fumarate, succinate, citrate Organic acid salts such as acid salts, tartrates, oxalates and maleates; and amino acid salts such as ornithate, glutamate and asparaginate can be mentioned.
- salts include, for example, alkali metal salts such as sodium salt, potassium salt and lithium salt; alkaline earth metal salts such as calcium salt and magnesium salt; inorganic salts such as ammonium salt; dibenzylamine salt.
- Morphorine salt phenylglycine alkyl ester salt, ethylenediamine salt, N-methylglucamine salt, diethylamine salt, triethylamine salt, cyclohexylamine salt, dicyclohexylamine salt, N, N'-dibenzylethylenediamine salt, diethanolamine salt, N-benzyl
- organic amine salts such as -N- (2-phenylethoxy) amine salt, piperazine salt, tetramethylammonium salt, and tris (hydroxymethyl) aminomethane salt.
- the antibody-drug conjugate, free drug or production intermediate of the present invention may exist as a hydrate by absorbing water in the air or the like.
- the solvate of the present invention is not particularly limited as long as it is pharmaceutically acceptable, but specifically, a hydrate, an ethanol solvate, a 2-propanol solvate and the like are preferable.
- a nitrogen atom when present in the antibody-drug conjugate, free drug or production intermediate of the present invention, it may be an N-oxide compound, and these solvates and N-oxide compound are also the present invention. Is included in the range of.
- the present invention also includes compounds labeled with various radioactive or non-radioactive isotopes.
- An unnatural proportion of an atomic isotope may also be contained in one or more of the atoms constituting the antibody-drug conjugate, free drug or production intermediate of the present invention.
- Examples of the atomic isotope include deuterium ( 2 H), tritium ( 3 H), iodine-125 ( 125 I) and carbon-14 ( 14 C).
- the compounds of the present invention can also be radiolabeled with radioisotopes such as tritium ( 3 H), iodine-125 ( 125 I) or carbon-14 ( 14 C).
- Radiolabeled compounds are useful as therapeutic or prophylactic agents, research reagents such as assay reagents, and diagnostic agents such as in vivo diagnostic imaging agents. All isotopic variants of the antibody-drug conjugates of the present invention, whether radioactive or not, are within the scope of the present invention.
- Method R Preparation of anti-HER2 antibody
- a sugar chain remodeling antibody for example, can be produced by the method shown in FIG. 3 according to the method described in WO2013 / 120066.
- R-1 step Hydrolysis of glycosidic bond between GlcNAc ⁇ 1-4GlcNAc of chitobiose structure at the reducing end
- This step binds to asparagine at amino acid sequence 297 of the antibody of interest using a known enzymatic reaction.
- This is a step of cleaving a bound sugar chain (N297 bound sugar chain) to prepare a sugar chain cleaving antibody.
- a hydrolase such as EndoS enzyme at 0 ° C to 40 ° C in a buffer solution (50 mM phosphate buffer solution, etc.) of the target antibody (20 mg / ml).
- the reaction time is 10 minutes to 72 hours, preferably 1 to 6 hours.
- For wild-type EndoS enzyme use 0.1 to 10 mg, preferably 0.1 to 3 mg, with respect to 100 mg of antibody.
- the sugar chain between GlcNAc ⁇ 1 and 4GlcNAc was hydrolyzed (Fuc ⁇ 1,6) to produce a GlcNAc-antibody by performing affinity chromatography purification and / or hyrodoxyapatite column purification described later. it can.
- R-2 step Sugar chain transfer reaction
- This step is an MSG (MSG1, MSG2) or SG-type sugar chain oxazoline compound having an azide group-containing PEG linker against the above-mentioned (Fuc ⁇ 1,6) GlcNAc-antibody using an enzymatic reaction.
- azido sugar chain oxazoline compound is a step of binding to produce a sugar chain remodeling antibody.
- the above sugar chain cleavage antibody reacts with an azide sugar chain oxazoline in a buffer solution (phosphate buffer solution, etc.) from 0 ° C to 40 ° C in the presence of a catalytic amount of glycosyltransferase such as EndoS (D233Q / Q303L).
- the sugar chain transfer reaction is carried out.
- the reaction time is 10 minutes to 72 hours, preferably 1 to 6 hours.
- EndoS enzyme D233Q / Q303L
- purified sugar chain remodeling antibody can be obtained by performing affinity chromatography purification and hyrodoxyapatite column purification.
- the azido sugar chain oxazoline can be prepared according to the method described in Examples 3 to 5.
- the concentration of the aqueous antibody solution, the concentration measurement, and the buffer exchange can be performed according to the following common operations A to C.
- Common operation A Concentration of aqueous antibody solution
- Method S Conjugation
- the above-mentioned sugar chain remodeling antibody and production intermediate (2) are bound by a SPAAC reaction (strain-promoted alkyne azide cycloaddition: JACS. 2004, 126, 15046-15047) to form an antibody.
- SPAAC reaction strain-promoted alkyne azide cycloaddition: JACS. 2004, 126, 15046-15047
- a buffer solution of antibody Ab sodium acetate solution, sodium phosphate solution, sodium borate solution, etc. or a mixture thereof
- compound (2) in a suitable solvent (dimethylsulfoxide (DMSO), dimethylformamide (DMF), dimethylacetamide
- DMSO dimethylsulfoxide
- DMF dimethylformamide
- the SPAAC reaction proceeds by mixing a solution dissolved in (DMA), N-methyl-2-pyridone (NMP), propylene glycol (PG), etc. or a mixture thereof).
- the compound (2) is 2 mol to excess mol, preferably 1 mol to 30 mol, and the ratio of the organic solvent is preferably 1 to 200% v / v with respect to the buffer solution of the antibody with respect to 1 mol of the antibody.
- the reaction temperature is 0 ° C. to 37 ° C., preferably 10 ° C. to 25 ° C.
- the reaction time is 1 to 150 hours, preferably 6 hours to 100 hours.
- the antibody-drug conjugate is subjected to buffer exchange, purification, antibody concentration, and average number of drug bindings per antibody molecule by the common operations A to C described above and the common operations D to F described later, and the antibody-drug conjugate is measured.
- the gate can be identified.
- the concentration of antibody-drug conjugate solution was adjusted by common operations A and C.
- Communication operation E Measurement of antibody concentration in antibody-drug conjugate
- the bound drug concentration in the antibody-drug conjugate can be calculated using Lambert-Beer's law as shown below. Equation (I) using Lambert-Beer's law is shown below.
- A280 indicates the absorbance of the antibody-drug conjugate aqueous solution at 280 nm
- ⁇ 280 indicates the molar extinction coefficient of the antibody-drug conjugate at 280 nm
- C (mol ⁇ L- 1 ) indicates the antibody-drug conjugate of the antibody-drug conjugate.
- the values applied to this example using the above formula are described below.
- absorbance A280 the measured value of the UV absorbance of the antibody-drug conjugate aqueous solution at 280 nm was used.
- the molar mass MW (g ⁇ mol- 1 ) uses the calculated estimated value of the antibody molecular weight obtained from the amino acid sequence of the antibody as an approximation of the molar mass of the antibody-drug conjugate.
- the optical path length l (cm) was measured at 1 cm.
- the molar extinction coefficient ⁇ 280 of the antibody drug conjugate can be determined by the following formula (IV).
- ⁇ Ab and 280 indicate the molar extinction coefficient of the antibody at 280 nm
- ⁇ DL and 280 indicate the molar extinction coefficient of the drug at 280 nm.
- ⁇ DL and 280 those calculated from the measured values obtained by UV measurement each time were used. That is, the absorbance of the solution in which the conjugate precursor (drug) was dissolved at a certain molar concentration was measured, and the value obtained by applying Lambert-Beer's law, formula (I) was used.
- the average number of drug bonds per antibody molecule in an antibody-drug conjugate can be determined by high performance liquid chromatography (HPLC) analysis using the following method.
- HPLC high performance liquid chromatography
- HPLC analysis HPLC analysis is performed under the following measurement conditions.
- HPLC System Agilent 1290 HPLC System (Agilent Technologies) Detector: Ultraviolet absorptiometer (measurement wavelength: 280 nm, 329 nm)
- Detector Ultraviolet absorptiometer (measurement wavelength: 280 nm, 329 nm)
- Column BEH Phenyl (2.1 x 50 mm, 1.7 ⁇ m, Waters Acquity) Column temperature: 75 ° C
- Mobile phase A 0.1% trifluoroacetic acid (TFA), 15% isopropyl alcohol aqueous solution
- Mobile phase B 0.075% TFA, 15% isopropyl alcohol acetonitrile solution
- Gradient program 14% -36% (0 minutes-15 minutes) ), 36% -80% (15-17 minutes), 80% -14% (17 minutes-17.1 minutes), 14% -14% (17.1 minutes-23 minutes)
- Sample injection volume 5 ⁇ L
- the molar extinction coefficient (280 nm) of the L chain and the H chain in each antibody is determined by a known calculation method (Protein Science, 1995, vol.4, 2411-2423) for the amino acids of the L chain and the H chain of each antibody. Values estimated from the sequence can be used.
- 81488 was used as the estimated value as the molar extinction coefficient of the H chain according to its amino acid sequence.
- 81478 was used as an estimated value as the molar extinction coefficient of the H chain according to its amino acid sequence.
- the H01L02 antibody has an H-chain molar extinction coefficient of 79989
- the HwtL05 antibody has an H-chain molar extinction coefficient of 814808
- the LPS antibody has an H-chain molar extinction coefficient of 77470.
- the extinction coefficient (280 nm) the actually measured molar extinction coefficient (280 nm) of the drug linker 1 (Example 2-3), which is a conjugate precursor, was used.
- [F-3-3] Calculate the ratio (%) of each chain peak area to the total peak area correction value according to the following formula.
- the antibody-drug conjugate of the present invention exhibits cytotoxic activity against cancer cells, it can be used as a medicine, particularly as a therapeutic agent and / or a preventive agent for cancer.
- the types of cancer to which the antibody-drug conjugate of the present invention is applied include lung cancer, urinary tract epithelial cancer, colon cancer, prostate cancer, ovarian cancer, pancreatic cancer, breast cancer, bladder cancer, gastric cancer, gastrointestinal stromal tumor, and cervix.
- cancer esophageal cancer, squamous epithelial cancer, peritoneal cancer, liver cancer, hepatocellular carcinoma, colon cancer, rectal cancer, colorectal cancer, endometrial cancer, uterine cancer, salivary adenocarcinoma, kidney cancer, genital cancer, thyroid cancer,
- penile cancer and its metastatic morphology can be mentioned, but the cancer cells to be treated are limited as long as they express a protein that can be recognized by the antibody in the antibody-drug conjugate. Will not be done.
- the antibody-drug conjugate of the present invention can be suitably administered to mammals, but is more preferably human.
- the substance used in the pharmaceutical composition containing the antibody-drug conjugate of the present invention can be appropriately selected and applied from pharmaceutical additives and others usually used in this field in terms of dose and concentration. ..
- the antibody-drug conjugate of the present invention can be administered as a pharmaceutical composition containing one or more pharmaceutically compatible components.
- the pharmaceutical composition typically comprises one or more pharmaceutical carriers, such as sterilized liquids (eg, water and oil (eg, oils, animals, plants, or synthetically derived oils (eg, sesame oil)). , Soybean oil, mineral oil, sesame oil, etc.)))).
- Water is a more representative carrier when the pharmaceutical composition is administered intravenously.
- Salt aqueous solution, dextrose aqueous solution and glycerol aqueous solution. can also be used as a liquid carrier, especially for injectable solutions. Suitable pharmaceutical excipients are known in the art.
- composition is also a trace amount of wetting agent, if desired.
- it may include an emulsifier, or a pH buffering agent.
- suitable pharmaceutical carriers are described in "Remington's Pharmaceutical Sciences” by EW Martin, the formulation of which corresponds to the mode of administration.
- Methods of introduction include, but are not limited to, intradermal, intramuscular, intraperitoneal, intravenous, and subcutaneous routes. Administration can be, for example, by injection or bolus injection. In certain preferred embodiments, administration of the ligand drug conjugate is by infusion. Parenteral administration is the preferred route of administration.
- the pharmaceutical composition is formulated according to a habitual procedure as a pharmaceutical composition suitable for intravenous administration to humans.
- the composition for intravenous administration is a solution in sterile isotonic aqueous buffer.
- the medication may also include a solubilizer and a local anesthetic (eg, lignokine) to relieve pain at the injection site.
- the ingredients are combined separately or in unit dosage forms (eg, as a lyophilized powder or anhydrous concentrate in a sealed, sealed container such as an ampoule or sachet indicating the amount of activator.
- the drug can be administered by infusion, for example, in an infusion bottle containing sterile pharmaceutical grade water or saline.
- an ampoule of lyophilized or saline solution for injection can be provided, for example, such that the above ingredients can be mixed prior to administration.
- the pharmaceutical composition of the present invention may be a pharmaceutical composition containing only the antibody-drug conjugate of the present invention, or a pharmaceutical composition containing the antibody-drug conjugate and at least one other cancer therapeutic agent. There may be.
- the antibody-drug conjugate of the present invention can also be administered together with other cancer therapeutic agents, whereby the anti-cancer effect can be enhanced.
- Other anti-cancer agents used for such purposes may be administered to an individual individually or continuously at the same time as the antibody-drug conjugate, or may be administered at different dosing intervals.
- Such cancer therapeutic agents include abraxane, carboplatin, cisplatin, gemcitabine, irinotecan (CPT-11), paclitaxel, pemetrexed, sorafenib, vinblastin or the agents described in WO2003 / 038043 pamphlet, as well as LH-RH analogs (leuprorelin , Gocerelin, etc.), estramustin phosphate, estrogen antagonists (tamoxifen, laroxyfen, etc.), aromatase inhibitors (anastrozole, letrozole, exemestane, etc.), etc., but drugs with antitumor activity If so, there is no limitation.
- Such a pharmaceutical composition may be formulated as a lyophilized preparation or a liquid preparation as a preparation having a selected composition and a required purity.
- a pharmaceutical composition When formulated as a lyophilized formulation, it may be a formulation containing suitable formulation additives used in the art.
- a liquid preparation can be formulated as a liquid preparation containing various preparation additives used in this field.
- the antibody-drug conjugate contained in the pharmaceutical composition of the present invention has an affinity for the antigen of the antibody-drug conjugate, that is, a dissociation constant for the antigen ( In terms of Kd value), the higher the affinity (lower Kd value), the more effective the drug can be exerted even with a small dose. Therefore, in determining the dose of the antibody-drug conjugate, the dose can be set based on the status of affinity between the antibody-drug conjugate and the antigen.
- the antibody-drug conjugate of the present invention is administered to humans, for example, about 0.001 to 100 mg / kg may be administered once or multiple times at intervals of 1 to 180 days.
- the antibody of the present invention or a functional fragment of the antibody can also be used as a medicine.
- the above description of "antibody-drug conjugate” relating to ⁇ pharmaceutical> can be appropriately read as the description relating to "antibody or functional fragment of the antibody”.
- the free drug (new PBD derivative compound) of the present invention can also be used as a medicine.
- the above description of "antibody-drug conjugate” relating to ⁇ pharmaceutical> can be appropriately read as the description relating to "free drug (new PBD derivative compound), salt thereof, or hydrate thereof”. ..
- "Trastuzumab” is sometimes referred to as HERCEPTIN (registered trademark), huMAb4D5-8, or rhuMAb4D5-8, and is composed of the amino acid sequences of amino acid numbers 1 to 450 of SEQ ID NO: 33.
- a humanized IgG1 antibody comprising a chain and a light chain consisting of the amino acid sequences set forth in amino acid numbers 1-214 of SEQ ID NO: 34 (US5821337).
- the Trastuzumab A2 antibody used herein is a constant region modified IgG1 antibody of Trastuzumab in which leucine (L) at positions 237 and 238 of the heavy chain amino acid sequence of Trastuzumab is mutated to alanine (A).
- the heavy chain amino acid sequence of Trastuzumab is set forth in SEQ ID NO: 33, and the light chain amino acid sequence is set forth in SEQ ID NO: 34.
- the heavy chain amino acid sequence of the Trastuzumab A2 antibody is set forth in SEQ ID NO: 31, and the light chain amino acid sequence is set forth in SEQ ID NO: 32.
- Trastuzumab variant design 1-1-1 Trastuzumab A1 heavy chain design Trastuzumab heavy chain variable region, IgG1 isotype, and weight in which leucine at positions 234 and 235 specified by the EU index is replaced with alanine.
- the strand was designed (referred to herein as "the heavy strand of Trastuzumab A1" or "Hwt”).
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 11 is shown in SEQ ID NO: 12.
- Hwt amino acid sequence the heavy chain in which the 105th tyrosine specified by the EU index was replaced with phenylalanine was named H01.
- the amino acid sequence of H01 is shown in SEQ ID NO: 15.
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 15 is set forth in SEQ ID NO: 16.
- L02. The amino acid sequence of L02 is shown in SEQ ID NO: 23.
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 23 is set forth in SEQ ID NO: 24.
- the light chain amino acid sequence of Trastuzumab the light chain in which leucine at position 46 and tyrosine at position 92 specified by the EU index were replaced with alanine was named L05.
- the amino acid sequence of L05 is shown in SEQ ID NO: 27.
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 27 is set forth in SEQ ID NO: 28.
- 1-2 Preparation of Trastuzumab A1 (HwtLwt), H01L02 antibody and HwtL05 antibody 1-2-1: Construction of light chain expression plasmid pCMA-LK A fragment of about 5.4 kb obtained by digesting the plasmid pcDNA3.3-TOPO / LacZ (Invitrogen) with restriction enzymes XbaI and PmeI, and SEQ ID NO: 9 A DNA fragment containing the human light chain signal sequence and the DNA sequence encoding the human kappa chain constant region shown in the above was bound using an In-Fusion HD PCR cloning kit (Clontech) to prepare pcDNA3.3 / LK. PCMA-LK was constructed by removing the neomycin expression unit from pcDNA3.3 / LK.
- a DNA fragment containing a human heavy chain signal sequence and a DNA sequence encoding a human IgG1 LALA constant region was bound using an In-Fusion HD PCR cloning kit (Clontech) to construct pCMA-G1LALA.
- Trastuzumab A1 heavy chain expression plasmid The DNA fragment shown in nucleotide numbers 36 to 434 of the nucleotide sequence encoding the heavy chain (Hwt) of Trastuzumab A1 shown in SEQ ID NO: 12 was synthesized (GENEART). .. An expression plasmid was constructed by inserting a synthesized DNA fragment into the site where pCMA-G1LALA was cut with the restriction enzyme BlpI using an In-Fusion HD PCR cloning kit (Clontech).
- H01 expression plasmid The DNA fragments shown in nucleotide numbers 36 to 434 of the nucleotide sequence encoding H01 shown in SEQ ID NO: 16 were synthesized (GENEART). An expression plasmid was constructed in the same manner as in Example 1-2-3.
- Trastuzumab A1 light chain expression plasmid The DNA fragment shown in nucleotide numbers 37 to 402 of the nucleotide sequence encoding the light chain (Lwt) of Trastuzumab A1 shown in SEQ ID NO: 20 was synthesized (GENEART). .. An expression plasmid was constructed by inserting a synthesized DNA fragment into a site where pCMA-LK was cut with the restriction enzyme BsiWI using an In-Fusion HD PCR cloning kit (Clontech).
- 1-3 Preparation of Trastuzumab A1, H01L02 antibody and HwtL05 antibody 1-3-1: Production of Trastuzumab A1, H01L02 antibody and HwtL05 antibody
- FreeStyle 293F cells (Invitrogen) were passaged and cultured according to the manual. 1.2 ⁇ 10 9 FreeStyle 293F cells (Invitrogen) in logarithmic growth phase were seeded in 3L Fernbach Erlenmeyer Flask (CORNING) and diluted with FreeStyle 293 expression medium (Invitrogen) 2.0 ⁇ 10 6 cells. Prepared to / mL.
- Trastuzumab A1, H01L02 antibody and HwtL05 antibody were produced by the combination of the heavy chain expression plasmid and the light chain expression plasmid corresponding to the combination of the heavy chain and the light chain shown in Example 1-1-3.
- Example 1-3-2 Purification of Trastuzumab A1, H01L02 antibody and HwtL05 antibody
- the culture supernatant obtained in Example 1-3-1 was purified in a one-step process of rProtein A affinity chromatography. After applying the culture supernatant to a column (manufactured by GE Healthcare Bioscience) filled with MabSelectSuRe equilibrated with PBS, the column was washed with PBS having at least twice the column volume. Next, it was eluted with 2M arginine hydrochloride solution (pH 4.0), and the fraction containing the antibody was collected.
- 2M arginine hydrochloride solution pH 4.0
- the fraction was buffer-substituted with 50 mM phosphate buffer (pH 6.0) by dialysis (Thermo Scientific, Slide-A-Lyzer Dialysis Cassette).
- the antibody was concentrated with Centrifugal UF Filter Device VIVASPIN20 (molecular weight cut-off UF10K, Sartorius) to adjust the IgG concentration to 20 mg / ml or more.
- VIVASPIN20 molecular weight cut-off UF10K, Sartorius
- 1-4 Measurement of Trastuzumab variant activity 1-4-1: Evaluation of binding property of Trastuzumab variant Trastuzumab A1, H01L02 antibody, HwtL05 antibody and human HER2 prepared in Example 1-3 were measured using Biacore T200 (manufactured by GE Healthcare Bioscience). , An antibody was captured as a ligand in an Anti-Human IgG (Fc) antibody immobilized using a Human Antibody Capture Kit (manufactured by GE Healthcare Bioscience), and the antigen was measured as an analyzer. ..
- HBS-EP + (manufactured by GE Healthcare Bioscience) was used as the running buffer, and CM5 (manufactured by GE Healthcare Bioscience) was used as the sensor chip.
- CM5 manufactured by GE Healthcare Bioscience
- Step 1 Benzyl (6S) -6- (hydroxymethyl) -5-azaspiro [2.4] heptane-5-carboxylate (1-2) Lithium borohydride (4.30 g) in a solution of 5-benzyl 6-methyl (6S) -5-azaspiro [2.4] heptane-5,6-dicarboxylate (1-1) (104 mmol, WO2012087596) in tetrahydrofuran (500 mL). , 178 mmol) was added little by little at 0 ° C. After stirring at 0 ° C. for 30 minutes, the mixture was stirred at room temperature for 2 hours.
- Step 2 Benzyl (6S) -6-( ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ methyl) -5-azaspiro [2.4] heptane-5-carboxylate (1-3) Tert-Butyldimethylsilyl chloride (24.2 g, 160 mmol) in a solution of compound (1-2) (27.9 g, 107 mmol) and imidazole (14.5 g, 214 mmol) obtained in step 1 above in dichloromethane (300 mL) at room temperature. ) was added, and the mixture was stirred at room temperature for 18 hours.
- Step 3 (6S) -6-( ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ methyl) -5-azaspiro [2.4] heptane (1-4)
- a 7.5% palladium carbon catalyst (54% water content, 5.00 g) was added at room temperature, and hydrogen was added at room temperature. The mixture was stirred in an atmosphere for 6 hours.
- the reaction solution was filtered through Celite, and the filtrate was evaporated under reduced pressure to give the desired product (1-4) (21.3 g, quantitative).
- Step 4 [(6S) -6-( ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ methyl) -5-azaspiro [2.4] hept-5-yl] (5-methoxy-2-nitro-4- ⁇ [Tri (propan-2-yl) silyl] oxy ⁇ phenyl) metanone (1-5) 5-Methoxy-2-nitro-4- ⁇ tri (propane-2-yl) silyl] oxy ⁇ benzoic acid (52.2 g, 141 mmol, US20150283262) and 1-hydroxybenzotriazole monohydrate (23.8 g, 155 mmol) N, N'-dicyclohexylcarbodiimide (35.0 g, 170 mmol) was added to a solution of dichloromethane (500 mL) under ice-cooling.
- dichloromethane 500 mL
- the reaction mixture was stirred at room temperature. After the disappearance of the carboxylic acid, a solution of the compound (1-4) (34.1 g, 141 mmol) obtained in the above step 3 and triethylamine (29.4 mL, 212 mmol) in dichloromethane (100 mL) was slowly added dropwise at -60 ° C. The reaction solution was stirred at room temperature overnight, saturated aqueous sodium hydrogen carbonate solution was added to the reaction mixture, and the reaction mixture was extracted with chloroform. The organic layer was washed with water and saturated brine and dried over anhydrous magnesium sulfate.
- Step 5 (2-Amino-5-methoxy-4- ⁇ [tri (propane-2-yl) silyl] oxy ⁇ phenyl) [(6S) -6-( ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ Methyl) -5-azaspiro [2.4] hepto-5-yl] methanone (1-6) 7.5% palladium carbon (10.0 g) was added to a solution of the compound (1-5) (55.0 g, 92.8 mmol) obtained in step 4 above in ethanol (300 mL) under a nitrogen atmosphere. The nitrogen balloon was immediately replaced with a hydrogen balloon, and the reaction mixture was vigorously stirred at room temperature under a hydrogen atmosphere.
- Step 6 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- [4-( ⁇ [(2- ⁇ [(6S))-6-( ⁇ [tert-butyl ( ⁇ [tert-butyl ( Dimethyl) Cyril] Oxy ⁇ Methyl) -5-azaspiro [2.4] Hept-5-yl] Carbon ⁇ -4-methoxy-5- ⁇ [Tri (Propan-2-yl) Cyril] Oxy ⁇ Phenyl) Carbamoyl] Oxy ⁇ Methyl) phenyl] -L-alanine amide (1-7) Triphosgene (4.22 g, 4.22 g,) in a THF (300 mL) solution of compound (1-6) (18.6 g, 33.0 mmol) and triethylamine (6.26 mL, 45.2 mmol) obtained in step 5 above on an ethanol-ice bath.
- Step 7 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- [4-( ⁇ [(2- ⁇ [(6S) -6- (hydroxymethyl) -5- (hydroxymethyl) -5- Azaspiro [2.4] hept-5-yl] carbonyl ⁇ -4-methoxy-5- ⁇ [tri (propan-2-yl) silyl] oxy ⁇ phenyl) carbamoyl] oxy ⁇ methyl) phenyl] -L-alanine amide
- Acetic acid 200 mL was added to a solution of the compound (1-7) (23.5 g, 24.3 mmol) obtained in step 6 above in tetrahydrofuran (50 mL), methanol (50 mL) and water (44 mL) at room temperature.
- Step 8 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-5 '-Oxo-8'- ⁇ [tri (propane-2-yl) silyl] oxy ⁇ -11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1- c] [1,4] benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (1-9) Oxalyl chloride (2.17 mL, 25.3 mmol) was slowly added dropwise to a solution of dimethyl sulfoxide (3.75 mL, 52.8 mmol) in dichloromethane (300 mL) at ⁇ 78 ° C.
- Step 9 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'- ⁇ [tert-butyl (dimethyl)) Cyril] oxy ⁇ -7'-methoxy-5'-oxo-8'- ⁇ [tri (propane-2-yl) silyl] oxy ⁇ -11', 11a'-dihydro-1'H-spiro [cyclopropane- 1,2'-Piroro [2,1-c] [1,4] benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (1-10) In a solution of compound (1-9) (12.0 g, 14.1 mmol) and 2,6-lutidine (6.58 mL, 56.5 mmol) obtained in step 8 above in dichloromethane (200
- Step 10 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'- ⁇ [tert-butyl (dimethyl)) Cyril] oxy ⁇ -8'-hydroxy-7'-methoxy-5'-oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] Benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alaninamide (1-11) Lithium acetate (0.611 g, 9.26 mmol) was added to a solution of the compound (1-10) (8.12 g, 8.42 mmol) obtained in step 9 above in N, N-dimethylformamide (90 mL) and water (2 mL).
- the absolute configuration of the 11'position was analyzed from the correlation (figure below) obtained from the selective 1D ROESY spectrum of compound (1-11). Since there is a correlation between 1' ⁇ -H and 11'-H, 3' ⁇ -H and 11'-H, and 1' ⁇ -H and 3' ⁇ -H, the absolute configuration at the 11'position was found to be an S arrangement.
- the absolute configuration at the 11'position of compound (5-9), compound (5-10) and drug linker 3 (compound (5-11)) obtained by the same synthetic method is the S configuration. ..
- Step 1 N- [4- (11,12-didehydrodibenzo [b, f] azocine-5 (6H) -yl) -4-oxobutanoyl] glycylglycine (2-2) 1- ⁇ [4- (11,12-didehydro) in a solution of glycylglycine (0.328 g, 2.49 mmol), N, N-diisopropylethylamine (0.433 mL, 2.49 mmol) in N, N-dimethylformamide (20 mL).
- Step 1 (2R, 11aS) -2- ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ -8-hydroxy-7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -2,3- Dihydro-1H-Piroro [2,1-c] [1,4] Benzodiazepine-5,11 (10H, 11aH) -dione (3-2) (2R, 11aS) -8- (benzyloxy) -2- ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ -7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -2,3- Dihydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-5,11 (10H, 11aH) -dione (3-1) (25.5 g, 41.6 mmol, WO2016149546) in tetrahydrofuran (150 m
- Step 2 (2R, 11aS) -8-[(5-Bromopentyl) oxy] -2- ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ -7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy ] Methyl ⁇ -2,3-dihydro-1H-Piroro [2,1-c] [1,4] Benzodiazepine-5,11 (10H, 11aH) -dione (3-3) In a solution of compound (3-2) (10.8 g, 20.7 mmol) obtained in step 1 above in N, N-dimethylformamide (30 mL), 1,5-dibromopentane (23.8 g, 103 mmol), potassium carbonate ( 3.43 g, 24.8 mmol) was added at room temperature.
- Step 3 (2R, 11aS) -8-[(5-bromopentyl) oxy] -2-hydroxy-7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -2,3-dihydro-1H -Piroro [2,1-c] [1,4] Benzodiazepine-5,11 (10H, 11aH) -Dion (3-4)
- tetrahydrofuran 40 mL
- 1 mol / L tetrabutylammonium fluoride tetrahydrofuran solution (28.0 mL, 28.0 mmol) at 0 ° C.
- Step 4 (11aS) -8-[(5-Bromopentyl) oxy] -7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1H-pyrrolo [2,1-c] [1, 4] Benzodiazepine-2,5,11 (3H, 10H, 11aH) -trion (3-5) Saturated sodium hydrogen carbonate of the compound (3-4) (11.3 g, 20.2 mmol), tetrabutylammonium bromide (0.325 g, 1.01 mmol), and potassium bromide (0.240 g, 2.02 mmol) obtained in step 3 above.
- Step 5 (11aS) -8-[(5-bromopentyl) oxy] -7-methoxy-5,11-dioxo-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -5,10,11,11a -Tetrahydro-1H-Piroro [2,1-c] [1,4] Benzodiazepine-2-yltrifluoromethanesulfonate (3-6) To a solution of compound (3-5) (9.74 g, 17.5 mmol) obtained in step 4 above in dichloromethane (160 mL), 2,6-lutidine (8.17 mL, 70.1 mmol) was added at -40 ° C, and- The mixture was stirred at 40 ° C.
- Step 6 (11aS) -8-[(5-bromopentyl) oxy] -7-methoxy-2- (4-methoxyphenyl) -10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1H-piroro [ 2,1-c] [1,4]
- Compound (3-6) (2.00 g, 2.91 mmol), 4-methoxyphenylboronic acid (0.884 g, 5.82 mmol), tetrakis (triphenylphosphine) palladium (0) (0.336 g, obtained in step 5 above).
- Step 7 (11aS) -8-[(5-Bromopentyl) oxy] -7-methoxy-2- (4-methoxyphenyl) -1,11a-dihydro-5H-pyrrolo [2,1-c] [1 , 4] Benzodiazepine-5-one (3-8)
- the compound (3-7) (0.789 g, 1.22 mmol) obtained in step 6 above was dissolved in ethanol (10 mL) and tetrahydrofuran (10 mL), and a 2.0 M lithium borohydride tetrahydrofuran solution (6.11 mL, 12.2 mmol) was dissolved. ) was added at 0 ° C., and the mixture was stirred at 0 ° C.
- Step 8 (11aS) -8-[(5-bromopentyl) oxy] -7-methoxy-2- (4-methoxyphenyl) -1,10,11,11a-tetrahydro-5H-pyrrolo [2,1- c] [1,4]
- Benzodiazepine-5-one (3-9)
- Sodium triacetoxyborohydride (0.421 g, 1.99 mmol) was added to a solution of compound (3-8) (0.496 g, 0.992 mmol) obtained in step 7 above in dichloromethane (20 mL) at 0 ° C. After stirring at room temperature for 2 hours, a saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted with chloroform.
- Step 9 Prop-2-en-1-yl (11aS) -8-[(5-bromopentyl) oxy] -7-methoxy-2- (4-methoxyphenyl) -5-oxo-11,11a-dihydro -1H-Piroro [2,1-c] [1,4]
- Benzodiazepine-10 (5H) -carboxylate (3-10) Pyridine (0.102 mL 1.27 mmol) and allyl chlorolate (0.374 mL, 3.54 mmol) were added to a solution of the compound (3-9) (0.426 g, 0.849 mmol) obtained in step 8 above in dichloromethane (30 mL). The mixture was added at ° C.
- Step 10 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'- ⁇ [tert-butyl (dimethyl)) Cyril] oxy ⁇ -7'-methoxy-8'- ⁇ [5-( ⁇ (11aS) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-10-[(prop-2-ene-) 1-Iloxy) carbonyl] -5,10,11,11a-tetrahydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-8-yl ⁇ oxy) pentyl] oxy ⁇ -5'-oxo- 11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H
- Step 11 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8 '- ⁇ [5-( ⁇ (11aS) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-10-[(prop-2-en-1-yloxy) carbonyl] -5,10, 11,11a-tetrahydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-8-yl ⁇ oxy) pentyl] oxy ⁇ -5'-oxo-11', 11a'-dihydro-1'H -Spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -
- Step 12 L-Valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8'-[(5- ⁇ [(11aS) -7-methoxy-2 -(4-Methoxyphenyl) -5-oxo-5,10,11,11a-tetrahydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-8-yl] oxy ⁇ pentyl) oxy]- 5'-oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H) -Il] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (3-13) Pyrrolidine (0.0579 mL, 0.700 mmol), tetrakis (tripheny
- Step 13 N- [4- (11,12-didehydrodibenzo [b, f] azosin-5 (6H) -yl) -4-oxobutanoyl] glycylglycyl-L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8'-[(5- ⁇ [(11aS) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-5, 10,11,11a-Tetrahydro-1H-Piroro [2,1-c] [1,4] Benzodiazepine-8-yl] Oxy ⁇ Pentyl) Oxy] -5'-oxo-11', 11a'-dihydro-1 'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benzodiazepine] -10'(5
- Step 1 (2R, 11aS) -8- (3-bromopropoxy) -2- ⁇ [tert-butyl (dimethyl) silyl] oxy ⁇ -7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -2,3-dihydro-1H-Piroro [2,1-c] [1,4]
- Benzodiazepine-5,11 (10H, 11aH) -dione (4-1) The compound (3-2) (5.06 g, 9.67 mmol) and 1,3-dibromopropane (4.93 mL, 48.4 mmol) obtained in Example 2-3 Step 1 were used in the same manner as in Example 2-3 Step 2.
- the target product (4-1) (4.85 g, 78%) was obtained.
- Step 2 (2R, 11aS) -8- (3-bromopropoxy) -2-hydroxy-7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -2,3-dihydro-1H-pyrrolo [ 2,1-c] [1,4]
- Benzodiazepine-5,11 (10H, 11aH) -dione (4-2) The compound (4-1) (4.85 g, 7.54 mmol) obtained in the above step 1 was reacted in the same manner as in Step 3 of Example 2-3 to obtain the target product (4-2) (4.05 g, quantitative).
- Step 3 (11aS) -8- (3-bromopropoxy) -7-methoxy-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1H-pyrrolo [2,1-c] [1,4] benzodiazepine -2, 5, 11 (3H, 10H, 11aH)-Trion (4-3)
- the compound (4-2) (7.54 mmol) obtained in the above step 2 was reacted in the same manner as in Step 2 of Example 2-3 to obtain the target product (4-3) (3.73 g, 93%). ..
- Step 4 (11aS) -8- (3-bromopropoxy) -7-methoxy-5,11-dioxo-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -5,10,11,11a-tetrahydro- 1H-Piroro [2,1-c] [1,4]
- Benzodiazepine-2-yltrifluoromethanesulfonate (4-4) The compound (4-3) (3.73 g, 7.08 mmol) obtained in the above step 3 was reacted in the same manner as in Step 5 of Example 2-3 to obtain the target product (4-4) (3.27 g, 70%).
- Step 5 (11aS) -8- (3-bromopropoxy) -7-methoxy-2- (4-methoxyphenyl-10- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1H-pyrrolo [2,1- c] [1,4]
- the compound (4-4) (3.27 g, 4.96 mmol) obtained in the above step 4 was reacted in the same manner as in Step 6 of Example 2-3 to obtain the target product (4-5) (2.49 g, 81%).
- Step 6 (11aS) -8- (3-bromopropoxy) -7-methoxy-2- (4-methoxyphenyl) -1,11a-dihydro-5H-pyrrolo [2,1-c] [1,4] Benzodiazepine-5-on (4-6)
- the compound (4-5) (2.49 g, 4.04 mmol) obtained in the above step 5 was reacted in the same manner as in Step 7 of Example 2-3 to obtain the target product (4-6) (1.59 g, 84%).
- Step 7 (11aS) -8- (3-bromopropoxy) -7-methoxy-2- (4-methoxyphenyl) -1,10,11,11a-tetrahydro-5H-pyrrolo [2,1-c] [ 1,4] Benzodiazepine-5-one (4-7)
- the compound (4-6) (1.59 g, 3.38 mmol) obtained in the above step 6 was reacted in the same manner as in Step 8 of Example 2-3 to obtain the target product (4-7) (1.39 g, 87%).
- Step 8 Prop-2-en-1-yl (11aS) -8- (3-bromopropoxy) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-11, 11a-dihydro-1H- Piroro [2,1-c] [1,4]
- Benzodiazepine-10 (5H) -carboxylate (4-8)
- the compound (4-7) (1.40 g, 2.95 mmol) obtained in the above step 7 was reacted in the same manner as in Step 9 of Example 2-3 to obtain the target product (4-8) (0.885 g, 54%).
- Step 9 N- ⁇ [(prop-2-en-1-yl) oxy] carbonyl ⁇ -L-valyl-N- [4-( ⁇ [(11'S, 11'aS) -11'- ⁇ [tert- Butyl (dimethyl) silyl] oxy ⁇ -7'-methoxy-8'-(3- ⁇ [(11aS) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-10- ⁇ [(prop-) 2-En-1-yl) oxy] carbonyl ⁇ -5,10,11,11a-tetrahydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-8-yl] oxy ⁇ propoxy) -5 '-Oxo-11', 11'a-dihydro-1'H, 3'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'( 5'H
- Step 10 N- ⁇ [(prop-2-en-1-yl) oxy] carbonyl ⁇ -L-valyl-N- [4-( ⁇ [(11'S, 11'aS) -11'-hydroxy-7'-Methoxy-8'-(3- ⁇ [(11aS) -7-methoxy-2- (4-methoxyphenyl) -5-oxo-10- ⁇ [(prop-2-en-1-yl) oxy] carbonyl ⁇ -5,10,11,11a-tetrahydro-1H-pyrrolo [2,1-c] [1,4] benzodiazepine-8-yl] oxy ⁇ propoxy) -5'-oxo-11', 11'a- Dihydro-1'H, 3'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H) -carbonyl] oxy ⁇ methyl) Phenyl] -L-
- Step 11 L-Valyl-N- [4-( ⁇ [(11'S, 11'aS) -11'-hydroxy-7'-methoxy-8'-(3- ⁇ [(11aS) -7-methoxy-2 -(4-Methoxyphenyl) -5-oxo-5,10,11,11a-tetrahydro-1H-piroro [2,1-c] [1,4] benzodiazepine-8-yl] oxy ⁇ propoxy) -5'-Oxo-11',11'a-dihydro-1'H,3'H-spiro[cyclopropane-1,2'-piroro [2,1-c] [1,4] benzodiazepine] -10'(5) 'H) -carbonyl] oxy ⁇ methyl) phenyl] -L-alanine amide (4-11)
- the compound (4-10) (0.0571 mmol) obtained in the above step 10 was reacted in the same manner as in Step 12 of Example 2-3
- Step 12 N- [4- (11,12-didehydrodibenzo [b, f] azosin-5 (6H) -yl) -4-oxobutanoyl] glycylglycyl-L-valyl-N- [4-( ⁇ [(11'S, 11'aS) -11'-Hydroxy-7'-Methoxy-8'-(3- ⁇ [(11aS) -7-Methoxy-2- (4-Methoxyphenyl) -5-oxo-5, 10,11,11a-Tetrahydro-1H-Piroro [2,1-c] [1,4] benzodiazepine-8-yl] oxy ⁇ propoxy) -5'-oxo-11', 11'a-dihydro-1' H, 3'H-spiro [cyclopropane-1,2'-piroro [2,1-c] [1,4] benzodiazepine] -10'(5'H)
- Step 1 Dimethyl (6S, 6'S) -5,5'- ⁇ 1,5-pentanediylbis [oxy (5-methoxy-2-nitrobenzene-4,1-diyl) carbonyl] ⁇ bis (5-azaspiro [2.4] ] Heptane-6-carboxylate) (5-2) 4,4'-[1,5-pentanediylbis (oxy)] bis (5-methoxy-2-nitrobenzoic acid) (5-1) (5.41 g, 10.9 mmol, Journal of Medicinal Chemistry 2004, 47, 1161 ), Oxalyl chloride (5.63 mL, 65.7 mmol) was added to a solution of dichloromethane (50 mL) at 0 ° C., and N, N-dimethylformamide (0.0844 mL, 1.09 mmol) was added dropwise.
- the reaction solution was heated to room temperature and stirred for 2 hours.
- the residue obtained by distillation under reduced pressure was dissolved in dichloromethane (100 mL), and methyl (6S) -5-azaspiro [2.4] heptane-6-carboxylate hydrochloride (4.28 g, 24.1 mmol, Tetrahedron Letters 2012. 53. 3847) and triethylamine (6.07 mL, 43.8 mmol) were added dropwise to a dichloromethane solution (100 mL) at -40 ° C under a nitrogen atmosphere. The reaction solution was heated to 0 ° C. and stirred for 2 hours.
- Step 2 ⁇ 1,5-pentanediylbis [oxy (5-methoxy-2-nitrobenzene-4,1-diyl)] ⁇ bis ⁇ [(6S) -6- (hydroxymethyl) -5-azaspiro [2.4] Hept-5-yl] Metanon ⁇ (5-3)
- Lithium hydride (714 mg, 32.8 mmol) was added to a solution of compound (5-2) (8.40 g, 10.9 mmol) obtained in step 1 above in tetrahydrofuran (100 mL), and the mixture was stirred at 0 ° C. for 30 minutes. Then, the temperature was raised to room temperature and the mixture was stirred for 1 hour.
- Step 3 Pentane-1,5-diylbis [oxy (5-methoxy-2-nitrobenzene-4,1-diyl) carbonyl (6S) -5-azaspiro [2.4] heptane-5,6-diylmethanediyl] diazetate ( 5-4)
- the compound (5-3) (7.70 g, 10.8 mmol) obtained in the above step 2 was dissolved in pyridine (20 mL) and acetic anhydride (10 mL, 105.9 mmol) and stirred at room temperature. Distillation under reduced pressure gave the desired product (5-4) (8.38 g, 97%).
- Step 4 1,5-pentanediylbis [oxy (2-amino-5-methoxybenzene-4,1-diyl) carbonyl (6S) -5-azaspiro [2.4] heptane-5,6-diylmethanediyl] di Acetate (5-5) After adding 5% palladium carbon (54% water content, 1.00 g) to the N, N-dimethylformamide (100 mL) solution of the compound (5-4) (8.28 g, 10.4 mmol) obtained in step 3 above. , The reaction solution was vigorously stirred at room temperature for 6 hours under a hydrogen atmosphere.
- Step 5 ⁇ (6S) -5- [4-( ⁇ 5- [4-( ⁇ (6S) -6-[(acetyloxy) methyl] -5-azaspiro [2.4] hept-5-yl ⁇ carbonyl)) -5-Amino-2-methoxyphenoxy] Pentyl ⁇ Oxy) -5-Methoxy-2- ⁇ [(Prop-2-en-1-yloxy) Carbonyl] Amino ⁇ Benzoyl] -5-Azaspiro [2.4] Hept-6 -Il ⁇ Methyl acetate (monoallyloxycarbonyl) (5-6) Pyridine (1.10 mL, 13.7 mmol) was added to a solution of compound (5-5) (5.05 g, 6.85 mmol) obtained in step 4 above in dichloromethane (100 mL), and chloroformic acid was added at -78 ° C under a nitrogen atmosphere.
- Step 6 N-[(2-propen-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [2-( ⁇ (6S) -6-[(acetyloxy) methyl] -5] -Azaspiro [2.4] hept-5-yl ⁇ carbonyl) -5-( ⁇ 5- [4-( ⁇ (6S) -6-[(acetyloxy) methyl] -5-Azaspiro [2.4] hept-5-yl ⁇ ⁇ Carbonyl) -2-methoxy-5- ⁇ [(2-propen-1-yloxy) carbonyl] amino ⁇ phenoxy] pentyl ⁇ oxy) -4-methoxyphenyl] carbamoyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (5-7) The monoallyloxycarbonyl compound (5-6) (2.00 g, 2.44 mmol) obtained in step 5 above and N-[(prop-2-en-1-
- Step 7 N-[(2-propen-1-yloxy) carbonyl] -L-valyl-N- [4-( ⁇ [(2- ⁇ [(6S) -6- (hydroxymethyl) -5-azaspiro] 2.4] Hept-5-yl] carbonyl ⁇ -5- ⁇ [5-(4- ⁇ [(6S) -6- (hydroxymethyl) -5-azaspiro [2.4] hept-5-yl] carbonyl ⁇ -2- Methoxy-5- ⁇ [(2-propen-1-yloxy) carbonyl] amino ⁇ phenoxy) pentyl] oxy ⁇ -4-methoxyphenyl) carbamoyl] oxy ⁇ methyl) phenyl] -L-alanine amide (5-8) Potassium carbonate (1.49 g, 10.8 mmol) was added to a solution of compound (5-7) (2.64 g, 2.16 mmol) obtained in step 6 above in methanol (10 mL), and the mixture was stirred
- Step 8 N-[(2-propen-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-8'- ⁇ [5-( ⁇ (11'S, 11a'S) -11'-hydroxy-7'-methoxy-5'-oxo-10'-[(2-propen-1-yloxy) carbonyl] -5', 10', 11', 11a'- Tetrahydro-1'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -8'-yl ⁇ oxy) pentyl] oxy ⁇ -7'-methoxy-5 '-Oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H)- Il
- Step 9 L-Valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-Hydroxy-7'-Methoxy-8'-[(5- ⁇ [(11a'S) -7'-Methoxy- 5'-oxo-5', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-piroro [2,1-c] [1,4] benzodiazepine] -8'-yl] oxy ⁇ Pentyl) Oxy] -5'-oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyroro [2,1-c] [1,4] benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (5-10) The compound (5-9) (2.05 g, 1.80 mmol) obtained in
- Step 10 N- [4- (11,12-didehydrodibenzo [b, f] azosin-5 (6H) -yl) -4-oxobutanoyl] glycylglycyl-L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8'-[(5- ⁇ [(11a'S) -7'-methoxy-5'-oxo-5', 11a'-dihydro-1 'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benzodiazepine] -8'-yl] oxy ⁇ pentyl) oxy] -5'-oxo-11', 11a '-Dihydro-1'H-spiro [cyclopropane-1,2'-piroro [2,1-c] [1,4] benzodiazepine
- Step 1 Methyl (6S) -5- [4- (benzyloxy) -5-methoxy-2-nitrobenzoyl] -5-azaspiro [2.4] heptane-6-carboxylate (6-2) 4- (benzyloxy) -5-methoxy-2-nitrobenzoic acid (6-1) (6.07 g, 20.0 mmol, Tetrahedron 1995, 51, 5617), N, N-dimethylformamide (1.08 mL, 13.9 mmol) Oxalyl chloride (3.43 mL, 40.0 mmol) was added dropwise to a solution of dichloromethane (100 mL) under ice-cooling over 5 minutes.
- the reaction solution was stirred at room temperature for 5 hours and then distilled off under reduced pressure.
- the obtained residue was dissolved in dichloromethane (20 mL) and distilled off under reduced pressure. After repeating this operation three times, the residue was suspended in dichloromethane (5 mL), excess diethyl ether and hexane were added thereto, and the mixture was filtered and dried under reduced pressure to obtain crude acid chloride.
- the obtained acid chloride was dissolved in dichloromethane, cooled to -40 ° C (dry ice-acetonitrile bath), and methyl (6S) -5-azaspiro [2.4] heptane-6-carboxylate hydrochloride (4.22 g, 22.0 mmol).
- Step 2 (11a'S) -8'-(benzyloxy) -7'-methoxy-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benzodiazepine]- 5', 11'(10'H, 11a'H)-Zeon (6-3)
- Raney nickel (7.00 g) was added to a solution of the compound (6-2) (6.55 g, 16.0 mmol) obtained in the above step 1 in ethanol (150 mL) and tetrahydrofuran (150 mL) under a nitrogen atmosphere. Hydrazine monohydrate (7 mL) was added to the reaction mixture, and the temperature was gradually raised to 50 ° C.
- Step 3 (11a'S) -8'-(benzyloxy) -7'-methoxy-10'- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1'H-spiro [cyclopropane-1,2'-piroro [2,1-c] [1,4] Benzodiazepine] -5', 11'(10'H, 11a'H) -dione (6-4) A 2.6 mol / L normal butyllithium normal hexane solution (12.0 mL, 31.8) in a tetrahydrofuran (150 mL) solution of the compound (6-3) (10.0 g, 26.4 mmol) obtained in step 2 above at -40 ° C.
- Step 4 (11a'S) -8'-Hydroxy-7'-Methoxy-10'- ⁇ [2- (Trimethylsilyl) ethoxy] Methyl ⁇ -1'H-Spiro [Cyclopropane-1,2'-Piroro [2, 1-c] [1,4] Benzodiazepine] -5', 11'(10'H, 11a'H) -dione (6-5)
- a 5% palladium carbon catalyst (5.00 g) in a solution of the compound (6-4) (18.7 g, 36.8 mmol) obtained in step 3 above in a solution of terrorahydrofuran (50 mL) and ethanol (100 mL) under a nitrogen atmosphere.
- Python 5% palladium carbon catalyst
- Step 5 (11a'S) -8'-[(5-bromopentyl) oxy] -7'-methoxy-10'- ⁇ [2- (trimethylsilyl) ethoxy] methyl ⁇ -1'H-spiro [cyclopropane-1] , 2'-Piroro [2,1-c] [1,4] Benzodiazepine] -5', 11'(10'H, 11a'H) -dione (6-6)
- the compound (6-5) (2.77 g, 6.62 mmol) obtained in the above step 4 was reacted in the same manner as in Step 2 of Example 2-3 to obtain the target product (6-6) (3.31 g, 88%).
- Step 6 (11a'S) -8'-[(5-bromopentyl) oxy] -7'-methoxy-1', 11a'-dihydro-5'H-spiro [cyclopropane-1,2'-pyrolo [2] , 1-c] [1,4] Benzodiazepine] -5'-on (6-7)
- the compound (6-6) (3.31 g, 5.83 mmol) obtained in the above step 5 was reacted in the same manner as in Step 2-3 of Example 2-3 to produce the target product (6-7) (1.11 g, 45%).
- Step 7 (11a'S) -8'-[(5-bromopentyl) oxy] -7'-methoxy-1', 10', 11', 11a'-tetrahydro-5'H-spiro [cyclopropane-1, 2'-Piroro [2,1-c] [1,4] Benzodiazepine] -5'-on (6-8)
- the compound (6-7) (2.56 g, 6.08 mmol) obtained in the above step 6 was reacted in the same manner as in Step 8 of Example 2-3 to obtain the target product (6-8) (1.15 g, 45%).
- Step 8 Prop-2-en-1-yl (11a'S) -8'-[(5-bromopentyl) oxy] -7'-methoxy-5'-oxo-11', 11a'-dihydro-1'H -Spiro [Cyclopropane-1,2'-Piroro [2,1-c] [1,4] Benzodiazepine] -10'(5'H) -carboxylate (6-9)
- the compound (6-8) (1.15 g, 2.72 mmol) obtained in the above step 7 was reacted in the same manner as in Step 9 of Example 2-3 to obtain the target product (6-9) (1.14 g, 82%).
- Step 9 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'- ⁇ [tert-butyl (dimethyl)) Cyril] oxy ⁇ -7'-methoxy-8'- ⁇ [5-( ⁇ (11a'S) -7'-methoxy-5'-oxo-10'-[(prop-2-en-1-yloxy) carbonyl] -5', 10', 11', 11a'-tetrahydro-1'H-spiro [cyclopropane-1,2'-pyroro [2,1-c] [1,4] benzodiazepine] -8'-yl ⁇ Oxy) Pentyl] Oxy ⁇ -5'-oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benz
- Step 10 N-[(prop-2-en-1-yloxy) carbonyl] -L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8 '- ⁇ [5-( ⁇ (11a'S) -7'-methoxy-5'-oxo-10'-[(prop-2-en-1-yloxy) carbonyl] -5', 10', 11', 11a '-Tetrahydro-1'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -8'-yl ⁇ oxy) pentyl] oxy ⁇ -5'-oxo -11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-pyrrolo [2,1-c] [1,4] benzodiazepine] -10'(5'H) -yl] carbon
- Step 11 L-Valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-Hydroxy-7'-Methoxy-8'-[(5- ⁇ [(11a'S) -7'-Methoxy- 5'-oxo-5', 10', 11', 11a'-tetrahydro-1'H-spiro [cyclopropane-1,2'-pyroro [2,1-c] [1,4] benzodiazepine] -8 '-Il] Oxy ⁇ Pentyl) Oxy] -5'-Oxo-11', 11a'-dihydro-1'H-spiro [Cyclopropane-1,2'-Piroro [2,1-c] [1,4 ] Benzodiazepine] -10'(5'H) -yl] carbonyl ⁇ oxy) methyl] phenyl ⁇ -L-alanine amide (6-12) The compound (6-11) (0.3
- Step 12 N- [4- (11,12-didehydrodibenzo [b, f] azosin-5 (6H) -yl) -4-oxobutanoyl] glycylglycyl-L-valyl-N- ⁇ 4-[( ⁇ [(11'S, 11a'S) -11'-hydroxy-7'-methoxy-8'-[(5- ⁇ [(11a'S) -7'-methoxy-5'-oxo-5', 10', 11', 11a'-tetrahydro-1'H-spiro [cyclopropane-1,2'-pyrolo [2,1-c] [1,4] benzodiazepine] -8'-yl] oxy ⁇ pentyl) oxy] -5'- Oxo-11', 11a'-dihydro-1'H-spiro [cyclopropane-1,2'-piroro [2,1-c] [1,4] benz
- Step 1 (MSG1-) Asn Commercially available monosialo-Asn free (1S2G / 1G2S-10NC-Asn, manufactured by GlyTech Laboratory Co., Ltd.) (called “(MSG-) Asn”) (500 mg) is separated by reverse phase HPLC under the following conditions. The cells were purified and separated into (MSG1-) Asn (retention time around 15 to 19 min) eluted as the 1st main peak and (MSG2-) Asn (retention time around 21 to 26 min) eluted as the 2nd main peak.
- a 0.1% formic acid aqueous solution is used as an eluent
- an ELS-PDA trigger preparative system manufactured by JASCO Corporation
- Inertsil ODS-3 (10um, 30 ⁇ x250mm, manufactured by GL Science Co., Ltd.) is used for the column.
- the flow velocity was set to 30 mL / min.
- the first peak that was UV-detected (210 nm) during elution was fractionated and lyophilized to give the desired product (238 mg).
- a 0.1% trifluoroacetic acid aqueous solution was used as an eluent, an ELS-PDA trigger preparative system (manufactured by JASCO Corporation) was used for the device, and Inertsil ODS-3 (manufactured by GL Science Co., Ltd.) was used for the column.
- the peak of the target product detected by UV (210 nm) during elution was separated and lyophilized to obtain the target product (117 mg).
- Step 3 [N 3- PEG (3)]-MSG1 11-Azide-3,6,9-trioxaundecane-1-amine (0.108 mL, 0.541 mmol) and MSG1 (117 mg, 0.068) obtained in step 2 above were placed in a 5 ml sampling tube (Ina Optica Co., Ltd.). An aqueous solution (1.2 mL) of mmol) was added, the mixture was stirred for 1 hour, and then lyophilized.
- a small centrifuge (Hitachi Koki, CF16RX) was used to settle the solid matter and remove the supernatant. Further, diethyl ether (10 ml) was added, and after centrifugation, decantation was performed. Subsequently, acetonitrile (10 mL) was added, and after centrifugation, the decantation operation was repeated twice, and then dried under reduced pressure to obtain a crude product. The obtained solid product was purified by reverse phase HPLC under the same conditions as in Step 2 above to obtain the target product (94.2 mg).
- Step 4 [N 3- PEG (3)]-MSG1-Ox
- a 5 mL sampling tube manufactured by Ina Optica Co., Ltd.
- An aqueous solution (520 ⁇ l) of tripotassium phosphate (165 mg, 0.78 mmol) was added to the reaction solution after ice-cooling, and the mixture was stirred under ice-cooling for 3 hours.
- the obtained reaction solution was ultrafiltered using Amicon Ultra (Ultracell 30K, manufactured by Merck Millipore) to remove solid matter.
- the passing liquid was purified by gel filtration chromatography.
- Purif-Rp2 (manufactured by Shoko Scientific) is used for the device, HiPrep 26/10 Desalting (manufactured by GE Healthcare) is used for the column, 0.03% -NH 3 aqueous solution is used for the mobile phase, and the flow velocity is adjusted.
- the fractionation volume was 10 mL at 10 mL / min.
- Step 1 Preparation of (MSG-) Asn
- 1S2G / 1G2S-10NC-Asn-Fmoc manufactured by GlyTech Co., Ltd.
- Fmoc- (MSG-) Asn 1000 mg
- ethanol / water (1/1) It was dissolved in 10 mL
- 1N aqueous sodium hydroxide solution (1.75 mL, 4 eq) was added, and the mixture was stirred at room temperature for 3 hours.
- the reaction solution was ultrafiltered using Amicon Ultra (30K, manufactured by Millipore) to remove solids, and 1N hydrochloric acid (832 ⁇ l, 1.9 equivalents) was added to the obtained passing solution.
- the solvent was removed using a high-speed concentrator V-10 (manufactured by Biotage). Acetonitrile was added, and the solvent was removed using a high-speed concentrator V-10 (manufactured by Biotage), followed by reverse phase HPLC separation and purification.
- the eluent was 0.1% trifluoroacetic acid aqueous solution and 0.1% trifluoroacetic acid acetonitrile solution, Purif-Rp2 (manufactured by Shoko Scientific) was used for the device, and Inertsil ODS-3 (manufactured by GL Science) was used for the column. It was used. Fractions containing the object UV-detected (220 nm) during elution were combined and lyophilized.
- Step 2 Synthesis of MSG
- the compound (840 mg) obtained in Step 1 was dissolved in a 200 mM phosphate buffer solution (pH 6.25) (6000 ⁇ L), and EndoM (manufactured by Tokyo Chemical Industry Co., Ltd., 1 U / mL)).
- Aqueous solution 200 ⁇ L was added and incubated at 28 ° C. for 26 hours. Since the reaction was not completed, an aqueous solution of EndoM (manufactured by Tokyo Chemical Industry Co., Ltd., 1 U / mL) (50 ⁇ L) was added, and the mixture was incubated at 28 ° C. for 2 hours and then left at room temperature until the reaction was completed.
- reaction solution was ultrafiltered using Amicon Ultra (30K, manufactured by Millipore). Trifluoroacetic acid (80 ⁇ l) was added to the obtained passing solution, and reverse phase HPLC separation and purification was performed.
- the eluent was 0.1% trifluoroacetic acid aqueous solution and 0.1% trifluoroacetic acid acetonitrile solution, Purif-Rp2 (manufactured by Shoko Scientific) was used for the device, and Inertsil ODS-3 (GL Science) was used for the column. Made) was used. Fractions containing the object UV-detected (220 nm) during elution were combined and lyophilized.
- Step 3 Synthesis of [N 3- PEG (3)]-MSG Using the compound (120 mg) obtained in Step 2 above, the target product (88.6 mg) was used in the same manner as in Step 3 of Example 3.
- Got ESI-MS Calcd for C 73 H 124 N 8 O 51 : [M + 2H] 2+ 965.37, Found 965.37
- Step 4 [N 3- PEG (3)]-synthesis of MSG-Ox Using the synthesized compound (100 mg) obtained in Step 3 above, the target product (88 mg) was used in the same manner as in Step 4 of Example 3. ) was obtained.
- Step 1 [N 3- PEG (3)] 2- SG (10) 11-Azide-3,6,9-trioxaundecane-1-amine (0.096 mL, 0.485 mmol), disialooctasaccharide (50 mg, 0.24 mmol) in a 5 ml sampling tube (Ina Optica Co., Ltd.) (0.5 mL) was added, and the mixture was stirred for 1 hour and then lyophilized.
- N of O- (7-azabenzotriazole-1-yl) -N, N, N', N'-tetramethyluronium hexafluorophosphate 92 mg, 0.24 mmol
- N-Dimethylformamide solution (0.6 mL) and diisopropylethylamine (0.042 mL, 0.24 mmol) were added, and the mixture was stirred at 37 ° C. for 4 hours. After completion of the reaction, the reaction solution was transferred to a centrifuge tube (50 ml) to which diethyl ether (20 ml) had been added in advance. A small centrifuge (Hitachi Koki, CF16RX) was used to settle the solid matter and remove the supernatant. Diethyl ether (20 ml) was added and decanted.
- Step 2 [N 3- PEG (3)] 2- SG (10) -Ox In a 5 mL sampling tube (manufactured by Ina Optica Co., Ltd.), the compound (40 mg) synthesized in step 1 above, 2-chloro-1,3-dimethyl-1H-benzimidazol-3-ium-chloride (manufactured by Fushimi Pharmaceutical Co., Ltd.) , 17.9 mg, 0.083 mmol) was added (200 ⁇ l). An aqueous solution (200 ⁇ l) of tripotassium phosphate (52.6 mg, 0.25 mmol) was added to the reaction solution after ice-cooling, and the mixture was stirred under ice-cooling for 2 hours.
- tripotassium phosphate 52.6 mg, 0.25 mmol
- the obtained reaction solution was ultrafiltered using Amicon Ultra (Ultracell 30K, manufactured by Merck Millipore) to remove solid matter.
- the passing liquid was purified by gel filtration chromatography.
- Purif-Rp2 manufactured by Shoko Scientific
- HiPrep 26/10 Desalting manufactured by GE Healthcare
- 0.03% -NH 3 aqueous solution was used for the mobile phase.
- the flow rate was 10 mL / min and the fractionation volume was 10 mL.
- Step 1 (Fuc ⁇ 1, 6) Preparation of GlcNAc-Trastuzumab A1 antibody To Trastuzumab A1 antibody solution ca.22.3 mg / mL (50 mM phosphate buffer (pH 6.0)) (2.69 mL) prepared in Example 1-3. , 7.7 mg / mL wild-type EndoS solution (PBS) was added in an amount of 0.156 mL, and the mixture was incubated at 37 ° C. for 4 hours. The progress of the reaction was confirmed using an Experion electrophoresis station (manufactured by BIO-RAD).
- BIO-RAD Experion electrophoresis station
- the reaction solution When binding to the column, the reaction solution is added to the upper part of the column, and the binding buffer (20 mM phosphate buffer (pH 6.0)) is flowed at 1.25 mL / min for 4 CV (Column Volume), and further at 5 mL / min for 5 CV flow. did.
- a washing solution (20 mM phosphate buffer (pH 7.0), 0.5 M sodium chloride solution) was flowed at 15 CV.
- an elution buffer (ImmunoPure IgG Eution buffer, manufactured by PIERCE) was flowed through 6 CV. The eluate was immediately neutralized with 1 M Tris buffer (pH 9.0).
- solution A and solution B 5 mM phosphate buffer 50 mM-morpholinoetan sulfonic acid (MES) solution (pH 6.8), 2 M sodium chloride solution) were used for elution.
- a washing solution 500 mM phosphate buffer (pH 6.5) was flowed at 5 CV.
- the buffer solution containing the target substance was exchanged using common operation C, and 6.08 mg / mL (Fuc ⁇ 1,6) GlcNAc-TrastuzumabA1 antibody solution (50 mM phosphate buffer (pH 6.0)) (6.10 mL) was applied. Obtained.
- Step 2 Preparation of Trasutuzumab A1 antibody- [MSG1-N 3 ] 2 6.08 mg / mL (Fuc ⁇ 1, 6) GlcNAc-Trasutuzumab A1 antibody solution (50 mM phosphate buffer (pH 6.0)) obtained in Step 1 above. ) (6.10 mL), 50 mM phosphate buffer (pH 6.0) solution (0.200 mL) of sugar chain (9.78 mg) synthesized in Example 3 step 4, 5.80 mg / mL EndoS D233Q / Q303L solution (PBS). ) (0.128 mL) was added and incubated at 30 ° C. for 3 hours.
- Step 1 (Fuc ⁇ 1, 6) Preparation of GlcNAc-H01L02 antibody H01L02 antibody solution prepared in Example 1-3 ca. Using 24.3 mg / mL (50 m phosphate buffer solution (pH 6.0)) (1.65 mL), the same operation as in Step 1 of Example 6 above was performed, and 20.0 mg / mL (Fuc ⁇ 1, 6) GlcNAc-H01L02 was performed. An antibody solution (50 mM phosphate buffer (pH 6.0)) (1.48 mL) was obtained.
- Step 2 Preparation of H01L02 antibody- [MSG1-N 3 ] 2 20.0 mg / mL (Fuc ⁇ 1, 6) GlcNAc-H01L02 antibody solution (50 mM phosphate buffer (pH 6.0)) (1.48) obtained in step 1 above.
- Step 1 (Fuc ⁇ 1, 6) Preparation of GlcNAc-HwtL05 antibody Anti-HwtL05 antibody solution prepared in Example 1-3 ca. Using 24.5 mg / mL (50 m phosphate buffer solution (pH 6.0)) (3.00 mL), the same operation as in Step 1 of Example 6 above was performed, and 20.39 mg / mL (Fuc ⁇ 1, 6) GlcNAc-HwtL05 An antibody solution (50 mM phosphate buffer (pH 6.0)) (2.8 mL) was obtained.
- Step 2 Preparation of HwtL05 antibody- [MSG1-N 3 ] 2 20.39 mg / mL (Fuc ⁇ 1, 6) GlcNAc-HwtL05 antibody solution (50 mM phosphate buffer (pH 6.0)) (2.1) obtained in step 1 above. 10.04 mg / mL HwtL05 antibody- [MSG1-N 3 ] 2 solutions (phosphate buffered saline (pH 6.0)) (4.0) by performing the same operation as in Step 2 of Example 6 using mL). mL) was obtained.
- Example 9 ADC1 ADC1 was synthesized by conjugating the antibody obtained in Step 6 of Example 6 with the drug linker 1 (3-14) obtained in Example 2-3 as shown in the reaction formula below.
- R indicates the drug linker used in the examples.
- Example 9 Step 1 The compound obtained in Example 9 Step 1 has a geometric isomer of a triazole ring, and a drug linker having two types of structures shown as R above is mixed and retained.
- Step 1 Conjugation of antibody and drug linker
- Example 6 In a phosphate buffered saline (pH 6.0) solution (10.0 mg / mL, 0.40 mL) of the antibody obtained in Step 2, at room temperature 1, Add 2-propanediol (0.767 mL) and a 10 mM dimethyl sulfoxide solution (0.033 mL; 12 equivalents per antibody molecule) of the compound (3-14) obtained in Step 2-3 of Example 2-3 to a tube rotator. The reaction was carried out at room temperature for 48 hours using (MTR-103, AS ONE Co., Ltd.). Purification operation: The above solution was purified using the common operation D described later to obtain 7.00 mL of a solution having the target compound. Characteristic evaluation: The following characteristic values were obtained using common operations E and F. Antibody concentration: 0.48 mg / mL, antibody yield: 3.39 mg (85%), average number of drug bonds per molecule of antibody (n): 1.7
- Example 10 ADC2 ADC2 was synthesized by conjugating the antibody obtained in Step 7 of Example 7 and the drug linker 1 (3-14) obtained in Step 13 of Example 2-3 as shown in the reaction formula below.
- R indicates the drug linker used in the examples.
- Example 10 Step 1 The compound obtained in Example 10 Step 1 has a geometric isomer of a triazole ring, and a drug linker having two types of structures shown as R above is mixed and retained.
- Step 1 Conjugation of antibody and drug linker
- Example 7 In a phosphate buffered saline (pH 6.0) solution (10.0 mg / mL, 400 ⁇ L) of the antibody obtained in Step 2, at room temperature 1, 2 -Propanediol (200 ⁇ L), 10 mM N, N-dimethylformamide solution (33.1 ⁇ L; 12 equivalents per molecule of antibody) of compound (3-14) obtained in Example 2-3 Step 13 and 1, A mixed solution of 2-propanediol (167 ⁇ L) was added, and the mixture was reacted at room temperature for 48 hours using a tube rotator (MTR-103, AS ONE Co., Ltd.).
- MTR-103 tube rotator
- Example 11 ADC3 ADC3 was synthesized by conjugating the antibody obtained in Step 8 of Example 8 and the drug linker 1 (3-14) obtained in Step 13 of Example 3 as shown in the reaction formula below.
- R indicates the drug linker used in the examples.
- Step 1 Conjugation of antibody and drug linker
- Example 8 In a phosphate buffered saline (pH 6.0) solution (10.04 mg / mL, 0.400 mL) of the antibody obtained in Step 2, at room temperature 1 , 2-Propanediol (0.367 mL), 10 mM dimethyl sulfoxide solution (0.033 mL; 12 equivalents per molecule of antibody) of the compound (3-14) obtained in Step 2-3 of Example 2-3, and tube.
- Example 12 ADC4 and ADC5 ADC4 was synthesized by conjugating the Trasutuzumab A2 antibody- [MSG1-N 3 ] 2 obtained in Step 6 of Example 6 with the drug linker 1 (3-14) obtained in Example 2-3.
- R indicates the drug linker used in the examples.
- Example 12 Step 1 The compound obtained in Example 12 Step 1 has a geometric isomer of a triazole ring, and a drug linker having two types of structures shown as R above is mixed and retained.
- Step 1-1 Antibody and drug linker conjugation (ADC4)
- ADC4 Antibody and drug linker conjugation (ADC4)
- Example 6 Phosphate buffered saline (pH 6.) of Trastuzumab A2 antibody- [MSG1-N 3 ] 2 (heavy chain amino acid sequence: SEQ ID NO: 31, light chain amino acid sequence: SEQ ID NO: 32) obtained in step 2.
- 0) In solution (10.0 mg / mL, 0.50 mL), 1,2-propanediol (0.486 mL) at room temperature, 10 mM dimethylsulfoxide of compound (3-14) obtained in Step 2-3 of Example 2-3.
- Step 1-2 Antibody and drug linker conjugation (ADC5)
- ADC5 Antibody and drug linker conjugation (ADC5)
- Example 6 Phosphate buffered saline (pH 6.) of Trastuzumab A2 antibody- [MSG1-N 3 ] 2 (heavy chain amino acid sequence: SEQ ID NO: 31, light chain amino acid sequence: SEQ ID NO: 32) obtained in step 2.
- 0) In solution (10.0 mg / mL, 0.50 mL), 1,2-propanediol (0.486 mL) at room temperature, 10 mM dimethylsulfoxide of compound (3-14) obtained in Step 2-3 of Example 2-3.
- Example 13 Cell growth inhibition test of antibody-drug conjugate (1)
- KPL-4 cells Kawasaki Medical University, Junichi Kurebayashi, British Journal of Cancer, (1999) 79 (5/6) .707-717
- RPMI 1640 Medium containing Hyclone
- RPMI medium containing Hyclone
- Viable cell rate (%) a ⁇ b ⁇ 100 a: Average value of luminescence of test substance-added wells b: The average IC 50 value of the luminescence of the medium-added well was calculated by the following formula.
- IC 50 (nM) antilog ((50-d) x (LOG 10 (b) -LOG 10 (a)) ⁇ (d-c) + LOG 10 (b)) a: Concentration of test substance a b: Concentration of test substance b c: Viable cell rate when the test substance at concentration a is added d: Viable cell rate when the test substance at concentration b is added a> b are two points with a viable cell rate of 50% in between.
- Antibody-drug conjugates ADC1 and ADC2 showed anti-cell effects of 0.001 ⁇ IC50 ⁇ 0.01 (nM) and ADC3 showed anti-cell effects of 0.01 ⁇ IC 50 ⁇ 0.1 (nM) on KPL-4 cells.
- Example 14 Cell growth inhibition test of antibody-drug conjugate (2) DMEM Medium (Thermo Fisher Scientific; It was prepared to 1.3 ⁇ 10 4 Cells / mL in DMEM medium), and 80 ⁇ L was added to each of 96-well cell culture microplates. After adding the cells, the cells were cultured overnight at 37 ° C. under 5% CO 2 . The next day, add 20 ⁇ L of anti-HER2 antibody-drug conjugate ADC1, ADC2, ADC3 diluted to 100nM, 20nM, 4nM, 0.8nM, 0.16nM, 0.032nM, 6.4pM, 1.3pM, 0.26pM in DMEM medium. did.
- Example 15 Cell growth inhibition test of antibody-drug conjugate (3) KPL-4 cells (Kawasaki Medical School, Junichi Kurebayashi, British Journal of Cancer, (1999) 79 (5/6). 707-717), which are human breast cancer strains of HER2 antigen-positive cells, were used in 10% bovine fetal serum ( It was prepared at 6.25 ⁇ 10 3 Cells / mL with RPMI 1640 Medium (Thermo Fisher Scientific; hereinafter referred to as RPMI medium) containing Hyclone), and 80 ⁇ L was added to each of a 96-well cell culture microplate. After adding the cells, the cells were cultured overnight at 37 ° C. under 5% CO 2 .
- RPMI 1640 Medium Thermo Fisher Scientific
- Example 16 Anti-tumor study of antibody-drug conjugate (1) Mice: 4-5 week old female BALB / c nude mice (Charles River Japan) were acclimated under SPF conditions for 4-7 days prior to experimental use. The mice were fed a sterilized solid feed (FR-2, Funabashi Farms Co., Ltd) and fed with sterilized tap water (prepared by adding a 5-15 ppm sodium hypochlorite solution). Measurement / calculation formula: In all studies, the major and minor diameters of the tumor were measured with an electronic digital caliper (CD-15CX, Mitutoyo Corp.) 2-3 times a week, and the tumor volume (mm 3 ) was calculated. .. The calculation formula is as shown below.
- Tumor volume (mm 3 ) major axis (mm) x [minor axis (mm)] 2 x 1/2
- the antibody-drug conjugate and antibody were all diluted with 10 mM-Acetate Buffer, 5% Sorbitol, pH 5.5 (Nacalai Tesque, Inc .; ABS buffer), and a liquid volume of 10 mL / kg was administered intravenously to the tail vein.
- ABS buffer was similarly administered as a control group (Vehicle group).
- KPL-4 cells Kanawasaki Medical School, Junichi Kurebayashi, British Journal of Cancer, (1999) 79 (5/6).
- Example 17 Anti-tumor test of antibody-drug conjugate (2) JIMT-1 cells (DSMZ ACC 589) were suspended in physiological saline (Otsuka Pharmaceutical Factory, Inc.), 5 ⁇ 10 6 cells were subcutaneously transplanted to the right side of a female nude mouse (Day 0), and randomly on Day 11. Grouping was carried out. Anti-HER2-antibody-drug conjugate ADC1 or ADC2 was administered intravenously on Day 11 at a dose of 0.4 mg / kg. In addition, ABS buffer was similarly administered as a control group (Vehicle group). The results are shown in FIG.
- Anti-HER2-antibody-drug conjugate ADC1 or ADC2 showed a strong antitumor effect with tumor regression at 0.4 mg / kg administration. In addition, no weight loss was observed in mice due to administration of anti-HER2-antibody-drug conjugate ADC1 or ADC2 at any dose.
- Example 18 Anti-tumor test of antibody-drug conjugate (3) CFPAC-1 cells (American Type Culture Collection; ATCC CRL-1918) were suspended in physiological saline (Otsuka Pharmaceutical Factory, Inc.), and 5 ⁇ 10 6 cells were subcutaneously transplanted to the right side of a female nude mouse (Day 0). , Day 10 was randomly grouped. Anti-HER2-antibody-drug conjugate ADC1 or ADC2 was administered intravenously on Day 10 at a dose of 0.4 mg / kg. In addition, ABS buffer was similarly administered as a control group (Vehicle group). The results are shown in FIG. In mice treated with the anti-HER2 antibody-drug conjugate ADC1, a strong antitumor effect with tumor regression was observed.
- Example 19 Anti-tumor study of antibody-drug conjugate (4) KPL-4 cells (Kawasaki Medical School, Junichi Kurebayashi, British Journal of Cancer, (1999) 79 (5/6). 707-717) were suspended in physiological saline (Otsuka Pharmaceutical Factory, Inc.) and 1.5 ⁇ 10 7 The cells were subcutaneously transplanted to the right side of a female nude mouse (Day 0) and randomly grouped on Day 14.
- the antibody-drug conjugate ADC5 was administered intravenously on Day 14 at a dose of 0.4 mg / kg.
- ABS buffer was similarly administered as a control group (Vehicle group). The results are shown in FIG.
- the antibody-drug conjugate ADC5 showed a strong antitumor effect with tumor regression at 0.4 mg / kg administration. No weight loss was observed in mice after administration of 0.4 mg / kg of antibody-drug conjugated ADC5.
- anti-HER2-antibody-drug conjugate anti-HER2 antibody and / or PBD derivative of the present invention
- various cancers can be treated or prevented.
- SEQ ID NO: 1 Amino acid sequence of CDRH1 of Trastuzumab A1 and A2 heavy chain and HwtL05 antibody heavy chain
- SEQ ID NO: 2 Amino acid sequence of Trastuzumab A1 and A2 heavy chain and CDRH2 of HwtL05 antibody heavy chain
- SEQ ID NO: 3 Trastuzumab A1 and A2 Amino acid sequence number of CDRH3 of the heavy chain and HwtL05 antibody heavy chain: H01L02 Amino acid sequence number of CDRH3 of the antibody heavy chain of H01L02 Amino acid sequence number 5: Trastuzumab A1 and Amino acid sequence number of CDRL1 of the light chain of A2 Amino acid SEQ ID NO: 7: Trastuzumab A1 and A2 light chain CDRL3 amino acid SEQ ID NO: 8: H01L02 antibody and HwtL05 antibody light chain CDRL3 amino acid SEQ ID NO: 9: Human light chain signal
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Abstract
Description
ADCに用いられる薬物として有用なものの一つにピロロベンゾジアゼピン(PBD)が挙げられる。PBDはDNA小溝のPuGPu配列などに結合することによって細胞毒性を示す。天然由来のPBDであるanthramycinは1965年に初めて発見され、それ以降様々な天然由来、またその類縁体のPBDが発見された(非特許文献1~4)。
PBDの一般的な構造式は下式
PBDは二量体構造にすることにより、飛躍的に細胞毒性が向上することが知られており(非特許文献5、6)、二量体PBDをADC化したものも種々報告されている(特許文献1~15)。しかしながら、C2位においてスピロ環を有するPBD又はそのADC体は知られていない。
ヒト上皮増殖因子受容体2(HER2)は、受容体蛋白質チロシンキナーゼの上皮増殖因子受容体サブファミリーに属する膜貫通受容体である(非特許文献7~12)。
HER2は乳がん、胃がん等様々ながん種において過剰発現しており(非特許文献13~18)、乳がんにおいては負の予後因子であることが報告されている(非特許文献19、20)。HER2過剰発現がんに対し有効な抗HER2薬として、トラスツズマブ、カドサイラ、ペルツヅマブ、ラパチニブ等が知られている。
しかしながら、応答性や活性の強さ、並びに適応範囲は未だ十分ではなく、HER2を標的とする未充足ニーズが存在している。
また、本発明は、抗腫瘍活性を有する抗HER2抗体及び抗HER2抗体-PBD誘導体コンジュゲート、ならびに新規PBD誘導体を含有する医薬組成物を提供するものである。
さらに、本発明は、抗HER2抗体及び抗HER2抗体-PBD誘導体コンジュゲート、ならびに新規PBD誘導体を用いた癌の治療方法を提供するものである。
すなわち本願発明は、以下に関するものである。
Dは、以下の群から選択されるいずれか一つであり、
Lは、AbのAsn297に結合する糖鎖(N297糖鎖)とDを連結するリンカーであり、
N297糖鎖はリモデリングされていてもよく、
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示す。)
で示される抗体-薬物コンジュゲート。
[2]Lは、-Lb-La-Lp-NH-B-CH2-O(C=O)-*で示され、
ここで、式中、アステリスク(*)はDと結合していることを示し、
Bは、1,4-フェニル基、2, 5-ピリジル基、3,6-ピリジル基、2,5-ピリミジル基又は2,5-チエニル基であり、
Lpは、以下の群;
-GGVA-、-GG-(D-)VA-、-VA-、-GGFG-、-GGPI-、-GGVCit-、-GGVK-、及び、-GGPL-、
から選択されるいずれか一つを示し、
Laは、以下の群;
-C(=O)-CH2CH2-C(=O)-、-C(=O)-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-、
-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-、-CH2-OC(=O)-、及び、-OC(=O)-、
から選択されるいずれか一つを示し、ならびに、
Lbは、次式で示され、
[3]Lが、以下の群;
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GG-(D-)VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPI-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGFG-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVK-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPL-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-、及び
-Z3-CH2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-
から選択されるいずれか一つを示し、
ここで、Bは、1,4-フェニル基を示し、
Z1は、以下の構造式;
Z2は、以下の構造式;
Z3は、以下の構造式;
ここで、Z1、Z2及びZ3の構造式において、アステリスク(*)は隣接するC(=O)、OC(=O)又はCH2と結合していることを示し、波線はN297糖鎖又はリモデリングされたN297糖鎖と結合していることを示す、[1]又は[2]に記載の抗体-薬物コンジュゲート。
[4]Lが、以下の群;
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、及び、
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-
から選択されるいずれか一つを示し、
ここで、Bは1,4-フェニル基であり、
Z1は以下の構造式;
ここで、上記Z1の構造式において、アステリスク(*)はZ1に隣接するC(=O)と結合していることを示し、波線はN297糖鎖又はリモデリングされたN297糖鎖と結合していることを示す、[3]に記載の抗体-薬物コンジュゲート。
[5]Dは、以下の群から選択されるいずれかである、[1]~[4]のいずれかに一つに記載の抗体-薬物コンジュゲート;
[6]抗体が、以下の(a)~(c)に記載のCDRH1、CDRH2及びCDRH3を含む重鎖、ならびにCDRL1、CDRL2及びCDRL3を含む軽鎖を含んでなる、[1]~[5]のいずれか一つに記載の抗体-薬物コンジュゲート;
(a)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、
(b)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、又は、
(c)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列からなるCDRL3。
[7]抗体が、以下の(a)~(d)からなる群から選択されるアミノ酸配列からなる重鎖可変領域、及び(e)~(i)からなる群から選択されるアミノ酸配列からなる軽鎖可変領域を含む、[1]~[6]のいずれか一つに記載の抗体-薬物コンジュゲート;
(a)配列番号13に記載のアミノ酸配列、
(b)配列番号17に記載のアミノ酸配列、
(c)(a)又は(b)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、
(d)(a)又は(b)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列、及び、
(e)配列番号21に記載のアミノ酸配列、
(f)配列番号25に記載のアミノ酸配列、
(g)配列番号29に記載のアミノ酸配列、
(h)(e)~(g)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、及び、
(i)(e)~(g)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列。
[8]抗体が、以下の(a)~(c)に記載の重鎖可変領域及び軽鎖可変領域を含む、[7]に記載の抗体-薬物コンジュゲート;
(a)配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域、
(b)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域、又は、
(c)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号21に記載のアミノ酸配列からなる軽鎖可変領域。
[9]抗体が、キメラ抗体である、[1]~[8]のいずれか一つに記載の抗体-薬物コンジュゲート。
[10]抗体が、ヒト化抗体である、[1]~[8]のいずれか一つに記載の抗体-薬物コンジュゲート。
[11]抗体が、ヒトIgG1、ヒトIgG2又はヒトIgG4の重鎖定常領域を含む、[9]又は[10]に記載の抗体-薬物コンジュゲート。
[12]抗体の重鎖定常領域がヒトIgG1の重鎖定常領域であり、該重鎖定常領域において、EU Indexにより示される234位及び235位のロイシンがアラニンに置換されている、[11]に記載の抗体-薬物コンジュゲート。
[13]抗体が、以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、[10]~[12]のいずれか一つに記載の抗体-薬物コンジュゲート;
(a)配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(H01L02)、
(b)配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(HwtL05)。
[14]抗体が、以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、[10]~[12]のいずれか一つに記載の抗体-薬物コンジュゲート;
(a)配列番号11においてアミノ酸番号20乃至469に記載のアミノ酸配列からなる重鎖及び配列番号19においてアミノ酸番号21乃至234に記載のアミノ酸配列からなる軽鎖、又は、
(b)配列番号31においてアミノ酸番号20乃至469に記載のアミノ酸配列からなる重鎖及び配列番号32においてアミノ酸番号21乃至234に記載のアミノ酸配列からなる軽鎖。
[15]抗体が、N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、[1]~[14]のいずれか一つに記載の抗体-薬物コンジュゲート。
[16]抗体の重鎖のカルボキシル末端において1つ又は数個のアミノ酸残基が欠失している、[15]に記載の抗体-薬物コンジュゲート。
[17]抗体の2本の重鎖の双方のカルボキシル末端において1つのアミノ酸残基が欠失している、[16]に記載の抗体-薬物コンジュゲート。
[18]抗体が、[6]~[17]のいずれか一つに記載の抗体と、HER2への結合において競合するか、又は、[6]~[17]のいずれか一つに記載の抗体が認識するHER2上の部位に結合する、[1]~[5]のいずれか一つに記載の抗体-薬物コンジュゲート。
[19]N297糖鎖が、リモデリングされた糖鎖である、[1]~[18]に記載の抗体-薬物コンジュゲート。
[20]N297糖鎖が、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGのいずれか一つであることを示す、[1]~[19]に記載の抗体-薬物コンジュゲート;
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)n5-*を示し、
ここで、n5は2~5の整数であることを示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、LにおけるZ1のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す。
[21]n5が3である、[20]に記載の抗体-薬物コンジュゲート。
[22]次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。
[23]次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。
[24]次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。
[25]次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。
[26]抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、[22]~[25]のいずれか一つに記載の抗体-薬物コンジュゲート。
[27]抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、[22]~[25]のいずれか一つに記載の抗体-薬物コンジュゲート。
[28]抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、[22]~[25]のいずれか一つに記載の抗体-薬物コンジュゲート。
[29]抗体が、配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域を含む、[22]~[26]のいずれか一つに記載の抗体-薬物コンジュゲート。
[30]抗体が、配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域を含む、[22]~[25]及び[27]のいずれか一つに記載の抗体-薬物コンジュゲート。
[31]抗体が、配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号21に記載のアミノ酸配列からなる軽鎖可変領域を含む、[22]~[25]及び[28]のいずれか一つに記載の抗体-薬物コンジュゲート。
[32]抗体が、配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖および配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、[22]~[26]及び[29]のいずれか一つに記載の抗体-薬物コンジュゲート。
[33]抗体が、配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖および配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、[22]~[25]、[27]及び[30]のいずれか一つに記載の抗体-薬物コンジュゲート。
[34]抗体が、配列番号11においてアミノ酸番号20乃至469に記載のアミノ酸配列からなる重鎖及び配列番号32においてアミノ酸番号21乃至234に記載のアミノ酸配列からなる軽鎖を含む、[22]~[25]、[28]及び[31]のいずれか一つに記載の抗体-薬物コンジュゲート。
[35]抗体が、配列番号31においてアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号32においてアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、[22]~[25]、[28]及び[31]のいずれか一つに記載の抗体-薬物コンジュゲート。
[36]抗体が、N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、[22]~[35]のいずれか一つに記載の抗体-薬物コンジュゲート。
[37]配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片。
[38]以下の(a)又は(b)に記載のCDRH1、CDRH2及びCDRH3を含む重鎖、ならびにCDRL1、CDRL2及びCDRL3を含む軽鎖を含む、[37]に記載の抗体又は該抗体の機能性断片;
(a)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、又は、
(b)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3。
[39]以下の(a)~(e)からなる群から選択されるアミノ酸配列からなる重鎖可変領域、及び(f)~(k)からなる群から選択されるアミノ酸配列からなる軽鎖可変領域を含む、[37]又は[38]に記載の抗体又は該抗体の機能性断片;
(a)配列番号13に記載のアミノ酸配列、
(b)配列番号17に記載のアミノ酸配列、
(c)(a)又は(b)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、
(d)(a)又は(b)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列、及び、
(e)配列番号25に記載のアミノ酸配列、
(f)配列番号29に記載のアミノ酸配列、
(g)(e)又は(f)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、及び
(h)(e)又は(f)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列。
[40]以下の(a)又は(b)に記載の重鎖可変領域及び軽鎖可変領域を含む、[39]に記載の抗体又は該抗体の機能性断片;
(a)配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域、又は、
(b)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域。
[41]キメラ抗体又はヒト抗体である、[37]~[40]のいずれか一つに記載の抗体又は該抗体の機能性断片。
[42]ヒト化抗体である、[37]~[40]のいずれか一つに記載の抗体又は該抗体の機能性断片。
[43]ヒトIgG1、ヒトIgG2又はヒトIgG4の重鎖定常領域を含む、[41]又は[42]に記載の抗体又は該抗体の機能性断片。
[44]重鎖定常領域がヒトIgG1の重鎖定常領域であり、該重鎖定常領域において、EU Indexにより示される234位及び235位のロイシンがアラニンに置換されている、[43]に記載の抗体又は該抗体の機能性断片。
[45]以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、[42]~[44]のいずれか一つに記載の抗体又は該抗体の機能性断片;
(a)配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(H01L02)、又は、
(b)配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(HwtL05)。
[46][37]~[45]のいずれか一つに記載の抗体と、HER2への結合において競合するか、又は、[37]~[45]のいずれか一つに記載の抗体が認識するHER2上の部位に結合する、抗体又は該抗体の機能性断片。
[47][37]~[46]のいずれか一つに記載の抗体又は該抗体の機能性断片をコードするポリヌクレオチド。
[48][47]に記載のポリヌクレオチドを含有する発現ベクター。
[49][48]に記載の発現ベクターにより形質転換された宿主細胞。
[50]宿主細胞が、真核細胞である[49]に記載の宿主細胞。
[51]宿主細胞が、動物細胞である[49]又は[50]に記載の宿主細胞。
[52][49]~[51]のいずれか一つに記載の宿主細胞を培養する工程、及び当該工程で得られた培養物から目的の抗体を採取する工程を含むことを特徴とする、[37]~[46]のいずれか一つに記載の抗体又は該抗体の機能性断片の製造方法。
[53][52]に記載の製造方法により得られることを特徴とする抗体又は該抗体の機能性断片。
[54]N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、[37]~[46]及び[53]のいずれか一つに記載の抗体又は該抗体の機能性断片。
[55]重鎖のカルボキシル末端において1つ又は数個のアミノ酸残基が欠失している、[54]に記載の抗体又は該抗体の機能性断片。
[56]2本の重鎖の双方のカルボキシル末端において1つのアミノ酸残基が欠失している、[55]に記載の抗体又は該抗体の機能性断片。
[57]重鎖のカルボキシル末端のプロリン残基が更にアミド化されている、[53]~[56]のいずれか一つに記載の抗体又は該抗体の機能性断片。
[58]以下の工程;
i)[49]~[51]のいずれか一つに記載の宿主細胞を培養し、得られた培養物から目的の抗体を採取する工程、
ii)工程i)で得られた抗体を加水分解酵素で処理し、(Fucα1,6)GlcNAc-抗体を製造する工程、及び、
iii)MSG(9)又はSG(10)のシアル酸の2位のカルボン酸のカルボニル基にアジド基を有するPEGリンカーを導入し、且つ、還元末端をオキサゾリン化して得た糖鎖ドナー分子と、糖転移酵素存在下で(Fucα1,6)GlcNAc-抗体を反応させる工程、を含む糖鎖リモデリング抗体の製造方法。
[59]更に、工程ii)の反応液を、ハイドロキシアパタイトカラムによる精製により(Fucα1,6)GlcNAc-抗体を精製する工程を含む、[58]に記載の製造方法。
[60][58]又は[59]に記載の製造方法で得られることを特徴とする、糖鎖リモデリング抗体。
[61][60]に記載の糖鎖リモデリング抗体を薬物リンカーと反応させる工程を含む、[1]~[36]のいずれか一つに記載の抗体-薬物コンジュゲートの製造方法。
[62][60]に記載の製造方法で得られることを特徴とする、抗体-薬物コンジュゲート。
[63]該抗体が、[53]~[57]及び[60]に記載のいずれか一つに記載の抗体である、[1]~[36]のいずれか一つに記載の抗体-薬物コンジュゲート。
[64]N297糖鎖が、N297-(Fuc)MSG1である、[1]~[36]、[62]及び[63]のいずれか一つに記載の抗体-薬物コンジュゲート。
[65]m1が、1の整数である、[1]~[36]及び[62]~[64]のいずれか一つに記載の抗体-薬物コンジュゲート。
[66]抗体―薬物コンジュゲートにおける抗体1分子あたりの平均薬物結合数が、1~3又は3~5である、[1]~[36]及び[62]~[65]のいずれか一つに記載の抗体―薬物コンジュゲート。
[67][1]~[36]及び[62]~[66]のいずれか一つに記載の抗体-薬物コンジュゲート、又は、[37]~[47]、[53]~[57]及び[60]のいずれか一つに記載の抗体又は該抗体の機能性断片を含むことを特徴とする医薬組成物。
[68]抗腫瘍薬であることを特徴とする、[67]に記載の医薬組成物。
[69]腫瘍が、HER2を発現していることを特徴とする、[68]に記載の医薬組成物。
[70][1]~[36]及び[62]~[66]のいずれか一つに記載の抗体-薬物コンジュゲート、又は、[37]~[47]、[53]~[57]及び[60]のいずれか一つに記載の抗体又は該抗体の機能性断片を個体に投与することを特徴とする腫瘍の治療方法。
[71]腫瘍が、HER2を発現していることを特徴とする、[70]に記載の腫瘍の治療方法。
[72][1]~[36]及び[62]~[66]のいずれか一つに記載の抗体-薬物コンジュゲート、又は、[37]~[47]、[53]~[57]及び[60]のいずれか一つに記載の抗体又は該抗体の機能性断片を含む医薬組成物、及び少なくとも一つの抗腫瘍薬を、同時に、別々に又は連続して個体に投与することを特徴とする腫瘍の治療方法。
[73]さらなる化合物とコンジュゲートされた[37]~[47]、[53]~[57]及び[60]のいずれか一つに記載の抗体又は該抗体の機能性断片。
本発明の抗HER2抗体-薬物コンジュゲートは、腫瘍細胞に発現している抗原を認識又は当該抗原に結合できる抗体に、リンカー構造部分を介して抗腫瘍性化合物を結合させた抗腫瘍性薬物である。
m1は1又は2の整数(好ましくは、1)であり、Dは薬物、LはN297糖鎖とDを連結するリンカー、Abは抗体又は該抗体の機能性断片、N297糖鎖は前記抗体のAsn297の側鎖に結合する糖鎖を示す。N297糖鎖はリモデンリングされた糖鎖でも良い。
本発明の薬物Dは抗腫瘍性化合物であることが好ましい。本抗腫瘍性化合物は、本発明の抗体-薬物コンジュゲートのリンカーの一部又は全部が腫瘍細胞内で切断され抗腫瘍性化合物部分が遊離されて抗腫瘍効果が発現される。
本発明の抗体-薬物コンジュゲートにおける薬物すなわちPBD誘導体は、以下の群から選択されるいずれか一つであり、
本発明の抗体-薬物コンジュゲート、その遊離薬物もしくはその製造中間体には、立体異性体あるいは不斉炭素原子に由来する光学異性体、幾何異性体、互変異性体又はd体、l体、アトロプ異性体等の光学異性体が存在することもあるが、これらの異性体、光学異性体及びこれらの混合物のいずれも本発明に含まれる。
本発明のPBD誘導体の部分構造としては、上記I(a)が好ましい。例えば、以下の群から選択されるいずれか一つである。
本発明のリンカーLは、N297糖鎖とDを連結するリンカーである。
当該リンカーLは、次式で示される。
-Lb-La-Lp-NH-B-CH2-O(C=O)-*
アステリスク(*)は、薬物DのN10’位の窒素原子と結合していることを示し、Lbは、LaとN297糖鎖又はリモデリングされたN297糖鎖を結合するスペーサーを示す。
Lpは、2から7個(好ましくは、2から4個)のアミノ酸で構成されるペプチド残基である。すなわち、2から7個のアミノ酸がペプチド結合したオリゴペプチドの残基によって構成される。
Lpは、N末端においてLb-La-のLaのカルボニル基に結合し、C末端においてリンカーの-NH-B-CH2-O(C=O)-部分のアミノ基(-NH-)とアミド結合を形成する。前記エステラーゼ等の酵素によって、LpのC末端と-NH-間の結合が切断される。
これらのアミノ酸は重複してもよく、任意に選択されたアミノ酸を含むアミノ酸配列を有する。また、アミノ酸の種類によって、薬物遊離のパターンをコントロールすることができる。
-GGVA-、-GG-(D-)VA-、-VA-、-GGFG-、-GGPI-、-GGVCit-、-GGVK-、-GG(D-)PI-、-GGPL-、-EGGVA、-PI-、-GGF-、-DGGF-、(D-)D-GGF-、-EGGF-、-SGGF-、-KGGF-、-DGGFG-、-GGFGG-、-DDGGFG-、-KDGGFG-、-GGFGGGF-
を挙げることができる。
ここで、上記の『(D-)V』はD-バリン、『(D-)P』はD-プロリン、『(D-)D』はD-アスパラギン酸を意味する。
-GGVA-、-GG-(D-)VA-、-VA-、-GGFG-、-GGPI-、-GGVCit-、-GGVK-、-GG(D-)PI-、-GGPL-
-GGVA-、-GGVCit-、-VA-
-C(=O)-(CH2CH2)n2-C(=O)-、-C(=O)-(CH2CH2)n2-C(=O)-NH-(CH2CH2)n3-C(=O)-、
-C(=O)-(CH2CH2)n2-C(=O)-NH-(CH2CH2O)n3-CH2-C(=O)-、
-C(=O)-(CH2CH2)n2-NH-C(=O)-(CH2CH2O)n3-CH2CH2-C(=O)-、-(CH2)n4-O-C(=O)-
ここで、式中、n2は1~3の整数(好ましくは、1又は2)、n3は1~5の整数(好ましくは、2~4の整数、より好ましくは、2又は4)、n4は0~2の整数(好ましくは、0又は1)を示す。
-C(=O)-CH2CH2-C(=O)-、-C(=O)-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-、
-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-、
-CH2-OC(=O)-、及び、-OC(=O)-
Laは、より好ましくは、-C(=O)-CH2CH2-C(=O)-、又は、-C(=O)-(CH2CH2)2-C(=O)-である。
上記で示されるLb(Lb-1、Lb-2又はLb-3)のそれぞれの構造式において、アジド基とDBCO(Dibenzocyclooctyne)のclick reactionで形成されるトリアゾール環部位は、幾何異性構造を有し、1つのLbは、これら2種類の構造のいずれか一方、又は、それらの混合物として存在する。すなわち、本発明の抗体-薬物コンジュゲート1分子中には2又は4個(m1は1又は2)の『-L-D』が存在し、2又は4個それぞれの『-L-D』におけるL中のそれぞれのLb(Lb-1、Lb-2又はLb-3)は、これら2種類の構造のいずれか一方、又は、その両方が混在している。
Bは、1,4-フェニル基であり、
Lpは、以下の群から選択されるいずれか一つを示し、
-GGVA-、-GG-(D-)VA-、-VA-、-GGFG-、-GGPI-、-GGVCit-、-GGVK-、-GGPL-
Laは、以下の群から選択されるいずれか一つを示し、
-C(=O)-CH2CH2-C(=O)-、-C(=O)-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-、
-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-、-CH2-OC(=O)-、-OC(=O)-
Lbは、上記で示されるLbのいずれかの構造式を示す。
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GG-(D-)VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPI-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGFG-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVK-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPL-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-、-Z3-CH2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-
ここで、Z1は、上記Lbの以下で示される構造式;
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、及び
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-
ここで、Bは1,4-フェニル基であり、
Z1は上記Lbの以下で示される構造式:
本発明の抗体-薬物コンジュゲートの遊離薬物は、以下の群から選ばれる一つである。
本発明において、「癌」と「腫瘍」は同じ意味に用いている。
本発明において、「遺伝子」とは、蛋白質のアミノ酸をコードするヌクレオチド配列が含まれるヌクレオチドもしくはヌクレオチド配列、またはその相補鎖を意味し、例えば、蛋白質のアミノ酸をコードするヌクレオチド配列が含まれるヌクレオチド配列またはその相補鎖であるポリヌクレオチド、オリゴヌクレオチド、DNA、mRNA、cDNA、RNA等は「遺伝子」の意味に含まれる。「HER2遺伝子」としては、例えば、HER2蛋白質のアミノ酸配列をコードするヌクレオチド配列が含まれるDNA、mRNA、cDNA、cRNA等をあげることができる。
本発明において、「ヌクレオチド」、「ポリヌクレオチド」又は「ヌクレオチド配列」と「核酸」は同義であり、例えば、DNA、RNA、プローブ、オリゴヌクレオチド、ポリヌクレオチド、プライマー等も「ヌクレオチド」又は「ヌクレオチド配列」の意味に含まれる。
本発明においては、「ポリペプチド」、「ペプチド」、「蛋白質」は区別せずに用いている。
本発明において、「HER2」は、HER2蛋白質と同じ意味で用いている。
本発明において、「細胞傷害活性」とは、何らかの形で、細胞に病理的な変化を引き起こすことをいい、直接的な外傷にとどまらず、DNAの切断や塩基の二量体の形成、染色体の切断、細胞分裂装置の損傷、各種酵素活性の低下などあらゆる細胞の構造や機能上の損傷を引き起こすことをいう。
本発明において、「1~数個」とは、1~10個、1~9個、1~8個、1~7個、1~6個、1~5個、1~4個、1~3個又は1~2個を意味する。
本発明において、「高い内在化能」とは、当該抗体とサポリン標識抗マウス又はラットIgG抗体を添加した標的抗原発現細胞(例えば、HER2発現細胞)の生存率(抗体未添加時の細胞生存率を100%とした相対率で表したもの)が、好ましくは70%以下、より好ましくは60%以下であることを意味する。
ヒトHER2蛋白は、N末端22アミノ酸残基からなるシグナル配列、630アミノ酸残基からなる細胞外ドメイン、23アミノ酸残基からなる細胞膜貫通ドメイン、580アミノ酸残基からなる細胞内ドメインから構成されている。
ヒトHER2のアミノ酸配列及びDNA配列は公的データベース上に公開されており、例えば、M11730(Genbank)、NP_004439.2(NCBI)等のアクセッション番号により参照可能である。
本発明の抗HER2抗体は腫瘍細胞を標的にできる抗体であり、すなわち腫瘍細胞を認識できる特性、腫瘍細胞に結合できる特性、そして腫瘍細胞内に取り込まれて内在化する特性等を備えている。したがって、本発明の抗HER2抗体と抗腫瘍活性を有する化合物を、リンカーを介して結合させて抗体-薬物コンジュゲートとすることができる。
本発明の抗HER2抗体は抗腫瘍活性を有していてもよい。
(1)以下(a)及び(b)の特性を有することを特徴とする抗体;
(a)HER2を認識又は結合する。
本発明の抗体はHER2を認識する。言い換えれば、本発明の抗体はHER2に結合する。本発明の抗体は、好ましくはHER2に結合し、より好ましくは、HER2に特異的に結合する。
本発明において「特異的な認識」、すなわち「特異的な結合」とは、非特異的な吸着ではない結合を意味する。結合が特異的であるか否かの判定基準としては、例えば、解離定数(Dissociation Constant:以下、「KDという」)をあげることができる。本発明の好適な抗体のHER2に対するKD値は1×10-5M以下、5×10-6M以下、2×10-6M以下または1×10-6M以下、より好適には5×10-7M以下、2×10-7M以下または1×10-7M以下である。
本発明における抗原と抗体の結合は、ELISA法、RIA法、Surface Plasmon Resonance(以下、「SPR」という)解析法等により測定または判定することができる。細胞表面上に発現している抗原と抗体との結合は、フローサートメトリー法等により測定することができる。
(b)HER2と結合することによってHER2発現細胞に内在化する活性を有する。
(2)HER2がヒトHER2である上記(1)に記載の抗体。
(ハイブリドーマを用いる方法)
(a)抗原として使用する生体高分子の精製、又は抗原発現細胞の調製、及び当該生体高分子又は抗原発現細胞の動物への投与、
(b)免疫反応を誘起された上述の動物より、抗体産生細胞を含む組織(例えばリンパ節)を採取、
(c)骨髄腫細胞(以下「ミエローマ」という)(例えば、マウスミエローマSP2/0-ag14細胞)の調製、
(d)抗体産生細胞とミエローマとの細胞融合、
(e)目的とする抗体を産生するハイブリドーマ群の選別、
(f)単一細胞クローンへの分割(クローニング)、
(g)場合によっては、モノクローナル抗体を大量に製造するためのハイブリドーマの培養、又はハイブリドーマを移植した動物の飼育、
(h)このようにして製造されたモノクローナル抗体の生理活性(内在化活性)、及びその結合特異性の検討、あるいは標識試薬としての特性の検定
ここで用いられる抗体価の測定法としては、例えば、フローサイトメトリー又はCell-ELISA法を挙げることができるがこれらの方法に制限されない。
(1)キメラ抗体
キメラ抗体としては、抗体の可変領域と定常領域が互いに異種である抗体、例えばマウス又はラット由来抗体の可変領域をヒト由来の定常領域に接合したキメラ抗体を挙げることができる(Proc.Natl.Acad.Sci.U.S.A.,81,6851-6855,(1984)等)。
(2)ヒト化抗体
ヒト化抗体としては、相補性決定領域(CDR;complementarity determining region)のみをヒト由来の抗体に組み込んだ抗体(Nature(1986)321,p.522-525等)、CDR移植法によって、CDRの配列に加え一部のフレームワークのアミノ酸残基もヒト抗体に移植した抗体(WO90/07861)、更に、一部のCDRのアミノ酸配列を改変した抗体(WO2012/075581、WO2011/084496、US2018/0501692)、遺伝子変換突然変異誘発(gene conversion mutagenesis)ストラテジーを用いてヒト化した抗体(US5821337)を挙げることができる。CDRのアミノ酸配列は、Kabatの定義、Chothiaの定義、Abmの定義、IMGT等公知の方法によって決めることができるが、本発明におけるCDRはいずれの方法によって定義されたものでもよい。
本発明のヒト化抗HER2抗体としては、H01L02抗体、HwtL05抗体又はTrastuzumab A1(HwtLwt)、Trastuzumab A2を挙げることができる。本発明の抗HER2抗体としてはH01L02抗体、HwtL05抗体、Trastuzumab A1(HwtLwt)又はTrastuzumab A2の6種全てのCDR配列を保持し、HER2結合活性を有する限り、特定のヒト化抗体に限定されず、更に1~数個(好ましくは、1~2個、より好ましくは1個)のCDRのアミノ酸配列を改変したヒト化抗体変異体もHER2蛋白質を認識する又は該抗体のHER2蛋白質結合活性を有する限り、特定のヒト化抗体に限定されない。
本発明の抗HER2ヒト化抗体又はその機能性断片としては、例えば、
配列表の配列番号1(図4)に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRH1、
配列表の配列番号2(図4)に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRH2、及び、
配列表の配列番号3(図4)に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む可変領域を有する重鎖、
並びに、
配列表の配列番号5(図6)に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRL1、
配列表の配列番号6(図6)のアミノ酸番号1~3に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRL2、及び、
配列表の配列番号7(図6)に示されるアミノ酸配列又は該アミノ酸配列の1~数個(好ましくは、1~2個)のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む可変領域を有する軽鎖を含み、
本発明のHER2蛋白質を認識する又は該抗体のHER2蛋白質結合活性を有する抗体又は該抗体の機能性断片等を挙げることができる。
上記抗HER2ヒト化抗体又はその機能性断片におけるCDRのアミノ酸置換の例としては、好ましくは、上記CDLH3又はCDRL3の1~数個(好ましくは、1~2個もしくは1個)のアミノ酸置換が挙げられ、配列表の配列番号3のアミノ酸番号9番のアミノ酸を置換した配列表の配列番号4(図5)に示されるCDRH3、又は配列表の配列番号7のアミノ酸番号4番のアミノ酸を置換した配列表の配列番号8(図7)に示されるCDRL3を例示できる。
本発明のCDRH1、CDRH2、CDRH3を含む重鎖及びCDRL1、CDRL2、CDRL3を含む軽鎖を含んでなる抗体として、以下(a)及び(b)を含む抗体を例示できる。
(a)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3(H01L02)、
(b)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3(HwtL05)、
(c)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列からなるCDRL3(Trastuzumab A1又はA2)。
配列表の配列番号17(図11)に示されるアミノ酸配列からなる重鎖可変領域、及び、配列表の配列番号25(図15)に示されるアミノ酸配列からなる軽鎖可変領域を含むことからなるヒト化抗体(H01L02)、
配列表の配列番号13(図9)に示されるアミノ酸配列からなる重鎖可変領域、および、配列表の配列番号29(図17)に示されるアミノ酸配列からなる軽鎖可変領域を含むことからなるヒト化抗体(HwtL05)、
配列表の配列番号13(図9)に示されるアミノ酸配列からなる重鎖可変領域、および、配列表の配列番号21(図13)に示されるアミノ酸配列からなる軽鎖可変領域を含むことからなるヒト化抗体(Trastuzumab A1(HwtLwt)、Trastuzumab A2)、
に示されるアミノ酸配列からなる軽鎖可変領域を含むことからなるヒト化抗体を好適に例示できる。
配列表の配列番号15(図10)のアミノ酸番号20~469に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号23(図14)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(H01L02)、
配列表の配列番号11(図8)のアミノ酸番号20~469に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号27(図16)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(HwtL05)、
配列表の配列番号11(図8)のアミノ酸番号20~469に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号19(図12)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(Trastuzumab A1(HwtLwt))、及び、
配列表の配列番号31(図21)のアミノ酸番号20~469に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号32(図22)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(Trastuzumab A2)を例示できる。
欠失体の重鎖として、配列表の配列番号11、15、31のアミノ酸番号20~468番目に記載のアミノ酸配列を含む重鎖が挙げられる。
当該欠失体として、
配列表の配列番号15(図10)のアミノ酸番号20~468に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号23(図14)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(H01L02)、
配列表の配列番号11(図8)のアミノ酸番号20~468に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号27(図16)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(HwtL05)、
配列表の配列番号11(図8)のアミノ酸番号20~468に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号19(図12)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(Trastuzumab A1(HwtLwt))、及び、
配列表の配列番号31(図21)のアミノ酸番号20~468に示されるアミノ酸配列からなる重鎖、及び、配列表の配列番号32(図22)のアミノ酸番号21~234に示されるアミノ酸配列からなる軽鎖を含むことからなるヒト化抗体(Trastuzumab A2)を例示できる。
また、配列表の配列番号19(図12)、23(図14)、27(図16)又は32(図22)に示される軽鎖アミノ酸配列中で、1~20番目のアミノ酸残基からなるアミノ酸配列はシグナル配列であり、21~127番目のアミノ酸残基からなるアミノ酸配列は軽鎖可変領域であり、128~234番目のアミノ酸残基からなるアミノ酸配列は軽鎖定常領域である。
ヒト化抗体HwtL05の重鎖アミノ酸配列をコードする塩基配列は配列番号12、軽鎖アミノ酸配列をコードする塩基配列は配列番号28、
ヒト化抗体Trastuzumab A1の重鎖アミノ酸配列をコードする塩基配列は配列番号12、軽鎖アミノ酸配列をコードする塩基配列は配列番号20で示されるポリヌクレオチドである。
上記ヒト化抗体H01L02の重鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号18、軽鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号26、
ヒト化抗体HwtL05の重鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号14、軽鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号30、
ヒト化抗体Trastuzumab A1の重鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号14、軽鎖可変領域のアミノ酸配列をコードする塩基配列は配列番号22で示されるポリヌクレオチドである。
なお、配列表の配列番号12、16に示される各ヌクレオチド配列の1~57番目のヌクレオチドからなるヌクレオチド配列は該ヒト化抗体重鎖のシグナル配列をコードしており、58~417番目のヌクレオチドからなるヌクレオチド配列は該ヒト化抗体重鎖可変領域のアミノ酸配列をコードしており、418~1407番目の塩基配列のヌクレオチドからなるヌクレオチド配列は該抗体重鎖定常領域をコードしている。
また、配列表の配列番号20、24、28に示される各ヌクレオチド配列の1~60番目のヌクレオチドからなるヌクレオチド配列は該ヒト化抗体軽鎖のシグナル配列をコードしており、61~381番目のヌクレオチドからなるヌクレオチド配列は該ヒト化抗体軽鎖可変領域のアミノ酸配列をコードしており、382~702番目のヌクレオチドからなるヌクレオチド配列は該抗体軽鎖定常領域をコードしている。
また、上記重鎖可変領域及び軽鎖可変領域の組合せを含むことからなる抗体、又は、上記重鎖及び軽鎖の組合せを含むことからなる抗体のCDRと同一のアミノ酸配列からなるCDRを有し、かつ該抗体のCDRのアミノ酸配列を除いたアミノ酸配列の同一性又は相同性が80%以上、好ましくは90%以上、より好ましくは95%以上、更に好ましくは97%以上、最も好ましくは99%以上である抗体もHER2への結合活性を有する限り、本発明の抗体に含まれる。
更に、重鎖又は軽鎖のアミノ酸配列に1~数個のアミノ酸残基が置換、欠失又は付加されたアミノ酸配列を組み合わせることによっても、上記の各抗体と同等の生物活性を有する抗体を選択することが可能である。また、本明細書中におけるアミノ酸の置換としては保存的アミノ酸置換が好ましい(WO2013154206等)。
保存的アミノ酸置換とは、アミノ酸側鎖に関連のあるアミノ酸グループ内で生じる置換である。かかるアミノ酸置換は元のアミノ酸配列を有する物質の特性を低下させない範囲で行うのが好ましい。
二種類のアミノ酸配列間の相同性は、Blast algorithm version 2.2.2 (Altschul, Stephen F., Thomas L.Madden,Alejandro A.Schaaffer, JinghuiZhang, ZhengZhang, Webb Miller, and David J.Lipman(1997),「Gapped BLAST and PSI-BLAST:a new generation of protein database search programs」,Nucleic Acids Res.25:3389-3402)のデフォルトパラメーターを使用することによって決定することができる。Blast algorithmは、インターネットでアクセスすることによっても使用することができる(www.ncbi.nlm.nih.gov/blast)。
(3)ヒト抗体
本発明の抗体としては、さらに、HER2に結合する、ヒト抗体を挙げることができる。抗HER2ヒト抗体とは、ヒト染色体由来の抗体の遺伝子配列のみを有するヒト抗体を含む。抗HER2ヒト抗体は、公知の方法によって得ることができる
(Nature Genetics(1997)16,p.133-143、Nucl.Acids Res.(1998)26, p.3447-3448、Animal Cell Technology:Basic and Applied Aspects vol.10,p.69-73、Kluwer AcademicPublishers,1999、Proc.Natl.Acad.Sci.USA(2000)97,p.722-727、Investigative Ophthalmology&Visual Science.(2002) 43(7), p.2301-2308、Briefings in Functional Genomics and Proteomics(2002), 1(2),p.189-203、Ophthalmology(2002)109(3),p.427-431、Nature Biotechnology(2005),23,(9), p.1105-1116、WO92/01047、WO92/20791、WO93/06213、WO93/11236、WO93/19172、WO95/01438、WO95/15388、Annu.Rev.Immunol(1994)12, p.433-455等)。
抗体の性質を比較する際の別の指標の一例としては、抗体の安定性を挙げることができる。示差走査カロリメトリー(DSC)は、蛋白の相対的構造安定性のよい指標となる熱変性中点(Tm)を素早く、また正確に測定することができる装置である。DSCを用いてTm値を測定し、その値を比較することによって、熱安定性の違いを比較することができる。抗体の保存安定性は、抗体の熱安定性とある程度の相関を示すことが知られており(Pharmaceutical Development and Technology(2007)12,p.265-273)、熱安定性を指標に、好適な抗体を選抜することができる。抗体を選抜するための他の指標としては、適切な宿主細胞における収量が高いこと、及び水溶液中での凝集性が低いことを挙げることができる。例えば収量の最も高い抗体が最も高い熱安定性を示すとは限らないので、以上に述べた指標に基づいて総合的に判断して、ヒトへの投与に最も適した抗体を選抜する必要がある。
また、本発明の抗体に結合している糖鎖修飾を調節すること(グリコシル化、脱フコース化等)によって、抗体依存性細胞傷害活性を増強することが可能である。抗体の糖鎖修飾の調節技術としては、WO1999/54342、WO2000/61739、WO2002/31140、WO2007/133855、WO2013/120066等が知られているが、これらに限定されるものではない。本発明の抗体には当該糖鎖修飾を調節された抗体も含まれる。
かかる修飾には、抗体又はその機能性断片における任意の位置に、または所望の位置においても施されてもよく、1つ又は2つ以上の位置に同一又は2種以上の異なる修飾がなされていてもよい。
本発明において「抗体断片の修飾体」は「抗体の修飾体の断片」をもその意味に含むものである。
真核細胞を宿主として使用する場合、動物細胞、植物細胞、真核微生物を用いることができる。特に動物細胞としては、哺乳類細胞、例えば、サルの細胞であるCOS細胞(Cell(1981)23,p.175-182、ATCC CRL-1650)、マウス線維芽細胞NIH3T3(ATCC No.CRL-1658)やチャイニーズ・ハムスター卵巣細胞(CHO細胞、ATCC CCL-61)のジヒドロ葉酸還元酵素欠損株(Proc.Natl.Acad.Sci.U.S.A.(1980)77,p.4126-4220)、FreeStyle 293F細胞(Invitrogen社)を挙げることができる。
原核細胞を使用する場合は、例えば、大腸菌、枯草菌を挙げることができる。
これらの細胞に目的とする抗体遺伝子を形質転換によって導入し、形質転換された細胞をin vitroで培養することによって抗体が得られる。当該培養においては抗体の配列によって収量が異なる場合があり、同等な結合活性を持つ抗体の中から収量を指標に医薬としての生産が容易なものを選別することが可能である。よって、本発明の抗体には、上記形質転換された宿主細胞を培養する工程、及び当該工程で得られた培養物から目的の抗体又は当該抗体の機能性断片を採取する工程を含むことを特徴とする当該抗体の製造方法によって得られる抗体も含まれる。
(a)H1L02抗体、HwtL05抗体、Trastuzumab A1(HwtLwt)、Trastuzumab A2のいずれか一つの抗体の重鎖アミノ酸配列をコードするポリヌクレオチドと軽鎖アミノ酸配列をコードするポリヌクレオチドの組み合わせ
(b)H1L02抗体、HwtL05抗体、Trastuzumab A1(HwtLwt)、Trastuzumab A2のいずれか一つの抗体のCDRH1~CDRH3を含む重鎖アミノ酸配列をコードするポリヌクレオチドとCDRL1~CDRL3を含む軽鎖アミノ酸配列をコードするポリヌクレオチドの組み合わせ
(c)H1L02抗体、HwtL05抗体、Trastuzumab A1(HwtLwt)、Trastuzumab A2のいずれか一つの抗体の重鎖可変領域のアミノ酸配列を含む重鎖アミノ酸配列をコードするポリヌクレオチドと軽鎖可変領域のアミノ酸配列を含む軽鎖アミノ酸配列をコードするポリヌクレオチドの組み合わせ
(d)(a)~(c)のいずれか一つに記載のポリヌクレオチドに相補的なポリヌクレオチドからなるヌクレオチドとストリンジェントな条件下でハイブリダイズし、且つ、HER2に結合する抗体のアミノ酸配列をコードするポリヌクレオチド、及び、
(e)(a)~(c)のいずれか一つに記載のポリヌクレオチドにおいて1~50個、1~45個、1~40個、1~35個、1~30個、1~25個、1~20個、1~15個、1~10個、1~8個、1~6個、1~5個、1~4個、1~3個、1若しくは2個、または1個のアミノ酸が置換、欠失、付加または挿入してなるポリペプチドのアミノ酸配列をコードし、且つ、HER2に結合する抗体のアミノ酸配列をコードするポリヌクレオチド。
本発明は、本発明の抗体もしくはその機能性断片又はその修飾体をコードするヌクレオチド、該遺伝子が挿入された組換えベクター、該遺伝子又は該ベクターが導入された細胞を含む。
また、本発明は、前記細胞を培養する工程、及び、その培養物から抗体もしくはその機能性断片又はその修飾体を回収する工程を含む、抗体もしくはその機能性断片又はその修飾体の製造方法も含む。
本発明の抗体のアイソタイプとしてIgG1を用いる場合は、定常領域のアミノ酸残基の一部を置換することによって、エフェクター機能を調整することが可能である。エフェクター機能を低減又は減弱させたIgG1の変異体としては、IgG1 LALA(IgG1-L234A、L235A)、IgG1 LAGA(IgG1-L235A、G237A)等が挙げられ、好ましくはIgG1 LALAである。なお、前記L234A,L235AはEU index(Proc.Natl.Acad.Sci.U.S.A., Vol.63, No.1(May 15,1969), p.78-85)により特定される234位、235位のロイシンのアラニンへの置換、G237AはEU indexにより特定される237位のグリシンのアラニンへの置換を示す。
クロマトグラフィーとしては、アフィニティークロマトグラフィー、イオン交換クロマトグラフィー、疎水性クロマトグラフィー、ゲル濾過クロマトグラフィー、逆相クロマトグラフィー、吸着クロマトグラフィー等を挙げることができる。
これらのクロマトグラフィーは、HPLCやFPLC等の液体クロマトグラフィーを用いて行うことができる。
アフィニティークロマトグラフィーに用いるカラムとしては、プロテインAカラム、プロテインGカラムを挙げることができる。
また抗原を固定化した担体を用いて、抗原への結合性を利用して抗体を精製することも可能である。
近年、不均一な抗体の糖タンパク質を、酵素反応等によってリモデリングし、官能基を有する糖鎖を均一に導入する方法が報告されている(ACS Chemical Biology 2012, 7, 110、ACS Medicinal Chemistry Letters 2016, 7, 1005、Bioconjugate Chemistry 2015, 26, 2233、Angew.Chem.Int.Ed. 2016,55,2361-2367、US2016361436)。
N結合型糖鎖はNグリコシド結合、O結合型糖鎖はOグリコシド結合により、抗体のアミノ酸側鎖と結合している。
L(PEG)は、-NH-CH2CH2-(O-CH2CH2) n5-*を示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-3鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、前記リンカーLにおけるLbの1,2,3-トリアゾール環上の1位又は3位の窒素原子と結合していることを示し、
ここで、n5は2~10の整数であり、好ましくは、2~5の整数である。
L(PEG)は、-NH-CH2CH2-(O-CH2CH2) n5-*を示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、前記リンカーLにおけるLbの1,2,3-トリアゾール環上の1位又は3位の窒素原子と結合していることを示し、
ここで、n5は2~10の整数であり、好ましくは、2~5の整数である。
L(PEG)は、-NH-CH2CH2-(O-CH2CH2) n5-*を示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-3鎖側及び1-6鎖側の両方の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、前記リンカーLにおけるLbの1,2,3-トリアゾール環上の1位又は3位の窒素原子と結合していることを示し、
ここで、n5は2~10の整数であり、好ましくは、2~5の整数である。
例えば、実施例9:ADC1はN297糖鎖がN297-(Fuc)MSG1の場合である。
N297糖鎖がN297-(Fuc)MSG1もしくはN297-(Fuc)MSG2又はN297-(Fuc)SGである場合、均一な品質のADCを取得することができる。
i)上述の宿主細胞(例えば、動物細胞(CHO細胞等))を培養し、得られた培養物から目的の抗体を採取する工程、
ii)工程i)で得られた抗体を加水分解酵素で処理し、N297糖鎖が(Fucα1,6)GlcNAcである抗体((Fucα1,6)GlcNAc-抗体)を製造する工程(図3A)、
好ましくは、更に当該反応液を、ハイドロキシアパタイトカラムによる精製を含む工程により(Fucα1,6)GlcNAc-抗体を精製する工程、及び、
iii)MSG(9)又はSG(10)のシアル酸の2位のカルボン酸のカルボニル基にアジド基を有するPEGリンカー-(N3-L(PEG))を導入し、且つ、還元末端をオキサゾリン化した糖鎖ドナー分子と、糖転移酵素存在下で(Fucα1,6)GlcNAc-抗体を反応させ、シアル酸にアジド基が導入された糖鎖リモデリング抗体を合成する工程(図3B)。
また、かかる製造方法により得られた糖鎖リモデリング抗体もしくはその機能性断片、又はそれらの修飾体も本発明に含まれる。
このようなMSG(MSG1、MSG2)又はSG型N297糖鎖を有する糖鎖リモデリング抗体は、例えばWO2013/120066などに記載の方法に準じて、図3に示すような方法で製造することができる。公知の方法に準じて宿主として動物細胞を用いて、遺伝子組み換え蛋白質として抗体を産生させた場合(上記工程i)、N297糖鎖は、基本構造としてフコース付加したN結合型糖鎖構造を有するが、非還元末端の構造や構成糖に多様な修飾がされた様々な構造からなる糖鎖を有する抗体またはその断片の混合物として得られる(図3AのIV)。このように動物細胞で産生された抗体は、EndoSなどの加水分解酵素で処理することによって、還元末端のキトビオース構造のGlcNAcβ1-4GlcNAcの間のグリコシド結合が加水分解され、N297糖鎖として(Fucα1,6)GlcNAcのみを有する単一の糖鎖構造を有する抗体分子(「(Fucα1,6)GlcNAc-抗体」という、図2のA参照)が得られる(図3A)(上記工程ii))。
抗体Abは前記抗HER2抗体又はその機能性断片であり、
N297糖鎖は、N297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物又は N297-(Fuc)SG(好ましくは、N297-(Fuc)MSG1)のいずれか一つであることを示し、
L(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側(好ましくは、1-3鎖側)の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク(*)は、前記リンカーLにおけるLbのトリアゾール環上の1位又は3位の窒素原子と結合していることを示す。
便宜上、上記最も好ましい抗体-薬物コンジュゲートとして、コンジュゲート1分子中に「N297糖鎖がL中のLbのトリアゾール環上の1位の窒素原子と結合した『-(N297糖鎖)-L-D』(『(N297糖鎖)-(N1Lb)L-D』)を2又は4個(m1=1又は2)有するか、「N297糖鎖がL中のLbのトリアゾール環上の3位の窒素原子と結合した『-(N297糖鎖)-L-D』(『(N297糖鎖)-(N3Lb)L-D』)」を2又は4個(m1=1又は2)有する構造を記載しているが、コンジュゲート1分子中に『(N297糖鎖)-(N1Lb)L-D』(m1=1の場合、1個、m1=2の場合、1,2,3個)及び『(N297糖鎖)-(N3Lb)L-D』(m1=1の場合、1個、m1=2の場合、3,2,1個)の両方を有する抗体-薬物コンジュゲートも含む。すなわち、コンジュゲート1分子中に『(N297糖鎖)-(N1Lb)L-D』か『(N297糖鎖)-(N3Lb)L-D』のいずれか一方のみ、又は、その両方が混在している。
本発明の抗体-薬物コンジュゲートにおいて、抗体が、抗体のリモデリングされた糖鎖からLに結合している場合、抗体―薬物コンジュゲートにおける抗体1分子あたりの薬物結合数m2は1または2の整数である。当該糖鎖がN297糖鎖であり、糖鎖がN297-(Fuc)MSG1、N297-(Fuc)MSG2又はN297-(Fuc)MSG1とN297-(Fuc)MSG2の混合物の場合、m2は1であり、DARは1~3の範囲(好ましくは、1.0~2.5の範囲、より好ましくは、1.2~2.2もしくは1.6~2.2の範囲)である。N297糖鎖が、N297-(Fuc)SGの場合、m2は2であり、DARは3~5の範囲(好ましくは、3.2~4.8の範囲であり、より好ましくは、3.5~4.2の範囲)である。
なお、当業者であれば本願の実施例の記載から抗体に必要な数の薬物を結合させる反応を設計することができ、ピロロベンゾジアゼピン誘導体の結合数をコントロールした抗体を取得することができる。
R法:抗HER2抗体の調製
糖鎖リモデリング抗体、例えばWO2013/120066などに記載の方法に準じて、図3に示すような方法で製造することができる。
本工程は目的の抗体に対して、公知の酵素反応を用いて抗体のアミノ酸配列297番目のアスパラギンに結合するN結合型糖鎖(N297結合糖鎖)を切断し、糖鎖切断抗体を調製する工程である。
目的の抗体(20mg/ml)を緩衝溶液(50mMリン酸緩衝溶液等)中、0℃から40℃までにおいて、EndoS酵素等の加水分解酵素を用いて還元末端のキトビオース構造のGlcNAcβ1と4GlcNAcの間のグリコシド結合の加水分解反応を実施する。反応時間は10分から72時間、好ましくは1時間から6時間である。野生型EndoS酵素は抗体100mgに対して、0.1から10mg、好ましくは0.1から3mgを用いる。反応終了後、後述するアフィニティークロマトグラフィー精製及び/又はハイロドキシアパタイトカラム精製を実施することでGlcNAcβ1と4GlcNAcの間の糖鎖が加水分解された(Fucα1,6)GlcNAc-抗体を製造することができる。
本工程は上述の(Fucα1,6)GlcNAc-抗体に対し、酵素反応を用いてアジド基を含むPEGリンカーを有するMSG(MSG1、MSG2)又はSG型糖鎖オキサゾリン体(以下、「アジド糖鎖オキサゾリン体」)を結合させ、糖鎖リモデリング抗体を製造する工程である。
上記の糖鎖切断抗体を緩衝溶液(リン酸緩衝溶液等)中、0℃から40℃までにおいて、触媒量のEndoS(D233Q/Q303L)等の糖転移酵素存在下、アジド糖鎖オキサゾリン体と反応させることで、糖鎖転移反応を実施する。反応時間は10分から72時間、好ましくは1時間から6時間である。EndoS酵素(D233Q/Q303L)は抗体100mgに対して、1から10mg、好ましくは1から3mgを用い、アジド糖鎖オキサゾリン体は2から過剰当量、好ましくは2から20当量を使用する。
反応終了後、アフィニティークロマトグラフィー精製とハイロドキシアパタイトカラム精製を実施することで精製した糖鎖リモデリング抗体を得ることができる。
アジド糖鎖オキサゾリン体は実施例3~5に記載の方法に従い調製できる。MSG(MSG(9)、MSG1、MSG2)又はジシアロオクタサッカリド(SG(10)、東京化成工業(株))に有機合成科学分野で公知の反応(縮合反応等)を利用して、アジド基を含むPEGリンカー(N3-L(PEG))であるN3-(CH2CH2-O)n5-CH2CH2-NH2を導入することができる。すなわち、シアル酸2位へのカルボン酸とN3-(CH2CH2-O)n5-CH2CH2-NH2の右末端のアミノ基が公知の縮合反応によりアミド結合を形成する。
なお、MSG、MSG1又はMSG2は、前記(MSG-)Asn又は分離精製した(MSG1-)Asnもしくは(MSG2-)AsnをEndoM等の加水分解酵素で加水分解することにより得ることができる。
(共通操作A:抗体水溶液の濃縮)
Amicon Ultra(30,000乃至50,000, MWCO,Millipore Co.)の容器内に抗体又は抗体-薬物コンジュゲート溶液を入れ、遠心機(Allegra X-15R,Beckman Coulter,Inc.)を用いた遠心操作(2000G乃至4000Gで5乃至20分間遠心)にて、抗体および後述する抗体-薬物コンジュゲート溶液を濃縮した。
(共通操作B:抗体の濃度測定)
UV測定器(Nanodrop 1000, Thermo Fisher Scientific Inc.)を用いて、メーカー規定の方法に従い、抗体濃度の測定を行った。その際に、抗体ごとに異なる280nm吸光係数(1.3mLmg-1cm-1乃至1.8mLmg-1cm-1)を用いた。
(共通操作C:抗体のバッファー交換)
抗体水溶液は緩衝溶液(リン酸緩衝生理食塩水(pH6.0)、リン酸緩衝液(pH6.0)等)を加え共通操作Aを用いて濃縮した。この操作を数回行った後、共通操作Bを用いて抗体濃度の測定を行い、緩衝溶液(リン酸緩衝生理食塩水(pH6.0)、リン酸緩衝液(pH6.0)等)を用いて10mg/mLに抗体濃度を調整した。
本製造法は、上述の糖鎖リモデリング抗体と製造中間体(2)をSPAAC反応(strain-promoted alkyne azide cycloaddition: JACS. 2004, 126,15046-15047)により結合させ、抗体-薬物コンジュゲートを製造する方法である。
La’、Lp’、B’は、La、Lp、Bと同義であり、
Jは、以下で示されるいずれかの構造式を示し、
式中、アステリスク(*)はLa’と結合していることを示す。
抗体1モルに対し、化合物(2)は2モルから過剰モル、好ましくは1モルから30モルであり、有機溶媒の比率は、抗体の緩衝液に対し1乃至200%v/vが好ましい。反応温度は0℃乃至37℃、好ましくは10℃から25℃であり、反応時間は1から150時間、好ましくは6時間から100時間である。反応時のpHは5乃至9が好ましい。
市販のSorbitol(5%)を含む酢酸緩衝液(10mM,pH5.5;本明細書でABSと称する)でNAP-25カラムを平衡化させた。このNAP-25カラムに、抗体-薬物コンジュゲート反応水溶液(約1.5~2.5mL)をのせ、メーカー規定の量の緩衝液で溶出させることで、抗体画分を分取した。この分取画分を再びNAP-25カラムにのせ、緩衝液で溶出させるゲルろ過精製操作を計2乃至3回繰り返すことで、未結合の薬物リンカーやジメチルスルホキシド、プロピレングリコールを除いた抗体-薬物コンジュゲートを得た。必要に応じて、共通操作AおよびCにより抗体-薬物コンジュゲート溶液の濃度を調製した。
(共通操作E:抗体-薬物コンジュゲートにおける抗体濃度の測定)
抗体-薬物コンジュゲートにおける結合薬物濃度は、下記に示すランベルト・ベールの法則を用いて、算出することができる。
以下にランベルト・ベールの法則を用いた式(I)を示す。
上記式(I)より抗体-薬物コンジュゲートのモル濃度C(mol・L-1)は以下の式(II)で求められる。
吸光度A280は、抗体-薬物コンジュゲート水溶液の280nmにおけるUV吸光度の実測値を用いた。モル質量MW(g・mol-1)は抗体のアミノ酸配列からより求められる抗体分子量の計算推定値を抗体-薬物コンジュゲートのモル質量の近似値として用いている。光路長l(cm)は1cmで測定した。
抗体薬物コンジュゲートのモル吸光係数ε280は、以下の式(IV)によって求めることができる。
εAb,280は抗体のアミノ酸配列から、既知の計算方法(Protein Science, 1995, vol.4, 2411-2423)によって推定することができる。実施例において、Trastuzumab A1抗体εAb,280=215057(計算推定値)を用いた。Trastuzumab A2のモル吸光係数は、εAb,280=215380(計算推定値)を用いた。H01L02抗体のモル吸光係数は、εAb,280=210014(計算推定値)、HwtL05抗体のモル吸光係数は、εAb,280=212834(計算推定値)LPS抗体のモル吸光係数は、εAb,280=230300(計算推定値)を用いた。
εDL,280は、都度UV測定で得た実測値より算出したものを使用した。すなわち、コンジュゲート前駆体(薬物)をあるモル濃度に溶解させた溶液の吸光度を測定し、ランベルト・ベールの法則、式(I)を適用することで得られる値を使用した。
抗体-薬物コンジュゲートにおける抗体一分子あたりの平均薬物結合数は、以下の方法を用いる高速液体クロマトグラフィー(HPLC)分析によって求めることができる。
[F-1.HPLC分析用サンプルの調製(抗体-薬物コンジュゲートの還元)]
抗体-薬物コンジュゲート溶液(約1mg/mL、60μL)をジチオトレイトール(DTT)水溶液(100mM、15μL)と混合する。混合物を37℃で30分インキュベートすることで、抗体-薬物コンジュゲートのL鎖及びH鎖間のジスルフィド結合を切断したサンプルを、HPLC分析に用いる。
[F-2.HPLC分析]
HPLC分析を、下記の測定条件にて行う。
HPLCシステム:Agilent 1290 HPLCシステム(Agilent Technologies)
検出器:紫外吸光度計(測定波長:280nm、329nm)
カラム:BEH Phenyl(2.1×50mm、1.7μm、Waters Acquity)
カラム温度:75℃
移動相A:0.1%トリフルオロ酢酸(TFA),15%イソプロピルアルコール水溶液
移動相B:0.075%TFA、15%イソプロピルアルコールアセトニトリル溶液
グラジエントプログラム:14%-36%(0分-15分)、36%-80%(15-17分)、80%-14%(17分―17.1分)、14%-14%(17.1分―23分)
サンプル注入量:5μL
〔F-3-1〕薬物の結合していない抗体のH鎖(H0)に対して、薬物の結合したH鎖(薬物が一つ結合したH鎖:H1、薬物が二つ結合したH鎖:H2)は、結合した薬物の数に比例して疎水性が増して保持時間が大きくなることから、L0、H0、H1、H2、の順に溶出される。L0及びH0との保持時間比較により検出ピークをL0、H0、H1、H2のいずれかに割り当てることができる。また薬物の結合は、薬物の特長的な329nmの波長吸収でも確認できる。
〔F-3-2〕薬物リンカーにUV吸収があるため、薬物リンカーの結合数に応じて、L鎖、H鎖及び薬物リンカーのモル吸光係数を用いて下式に従ってピーク面積値の補正を行う。
〔F-3-3〕 ピーク面積補正値合計に対する各鎖ピーク面積比(%)を下式に従って計算する。
本発明の抗体-薬物コンジュゲートは、癌細胞に対して細胞傷害活性を示すことから、医薬として、特に癌に対する治療剤及び/又は予防剤として使用することができる。
Trastuzumab A2抗体の作製
本明細書において、「Trastuzumab」はHERCEPTIN(登録商標)、huMAb4D5-8、rhuMAb4D5-8と呼ばれることもあり、配列番号33のアミノ酸番号1~450に記載のアミノ酸配列からなる重鎖及び配列番号34のアミノ酸番号1~214に記載のアミノ酸配列からなる軽鎖を含んでなるヒト化IgG1抗体である(US5821337)。
本明細書で使用したTrastuzumab A2抗体は、Trastuzumabの重鎖アミノ酸配列の237番目及び238番目のロイシン(L)をアラニン(A)に変異させた、Trastuzumabの定常領域改変IgG1抗体である。Trastuzumab の重鎖アミノ酸配列は配列番号33、軽鎖アミノ酸配列は配列番号34に記載されている。Trastuzumab A2抗体の重鎖アミノ酸配列は配列番号31、軽鎖アミノ酸配列は配列番号32に記載されている。
1-1:Trastuzumab改変体の設計
1-1-1:Trastuzumab A1の重鎖の設計
Trastuzumabの重鎖可変領域を有し、IgG1のアイソタイプであり、かつ、EU indexにより特定される234位、235位のロイシンをアラニンへ置換した重鎖を設計した(本明細書中、「Trastuzumab A1の重鎖」または「Hwt」と称する)。配列番号11のアミノ酸配列をコードするヌクレオチド配列を配列番号12に記載する。
Hwtアミノ酸配列において、EU indexにより特定される105番目のチロシンをフェニルアラニンに置換した重鎖をH01と命名した。H01のアミノ酸配列を配列番号15に記載する。配列番号15のアミノ酸配列をコードするヌクレオチド配列を配列番号16に記載する。
Trastuzumabの軽鎖アミノ酸配列において、EU indexにより特定される92番目のチロシンをアラニンに置換した軽鎖をL02と命名した。L02のアミノ酸配列を配列番号23に記載する。配列番号23のアミノ酸配列をコードするヌクレオチド配列を配列番号24に記載する。
Trastuzumabの軽鎖アミノ酸配列において、EU indexにより特定される46番目のロイシンと92番目のチロシンをアラニンに置換した軽鎖をL05と命名した。L05のアミノ酸配列を配列番号27に記載する。配列番号27のアミノ酸配列をコードするヌクレオチド配列を配列番号28に記載する。
Hwt及びLwtからなる抗体を「Trastuzumab A1」、「HwtLwt抗体」又は「HwtLwt」と称する。H01及びL02からなる抗体を「H01L02抗体」又は「H01L02」と称する。Hwt及びL05からなる抗体を「HwtL05抗体」又は「HwtL05」と称する。
1-2-1:軽鎖発現プラスミドpCMA-LKの構築
プラスミドpcDNA3.3-TOPO/LacZ(Invitrogen社)を制限酵素XbaI及びPmeIで消化して得られる約5.4kbのフラグメントと、配列番号9に示すヒト軽鎖シグナル配列及びヒトκ鎖定常領域をコードするDNA配列を含むDNA断片をIn-Fusion HD PCRクローニングキット(Clontech社)を用いて結合して、pcDNA3.3/LKを作製した。pcDNA3.3/LKからネオマイシン発現ユニットを除去することによりpCMA-LKを構築した。
pCMA-LKをXbaI及びPmeIで消化して軽鎖シグナル配列及びヒトκ鎖定常領域を取り除いたDNA断片と、配列番号10で示されるヒト重鎖シグナル配列及びヒトIgG1LALA定常領域をコードするDNA配列を含むDNA断片をIn-Fusion HD PCRクローニングキット(Clontech社)を用いて結合して、pCMA-G1LALAを構築した。
配列番号12に示すTrastuzumab A1の重鎖(Hwt)をコードするヌクレオチド配列のヌクレオチド番号36乃至434に示されるDNA断片を合成した(GENEART社)。In-Fusion HD PCRクローニングキット(Clontech社)を用いて、pCMA-G1LALAを制限酵素BlpIで切断した箇所に合成したDNA断片を挿入することにより発現プラスミドを構築した。
配列番号16に示すH01をコードするヌクレオチド配列のヌクレオチド番号36乃至434に示されるDNA断片を合成した(GENEART社)。実施例1-2-3と同様の方法で発現プラスミドを構築した。
配列番号20に示すTrastuzumab A1の軽鎖(Lwt)をコードするヌクレオチド配列のヌクレオチド番号37乃至402に示されるDNA断片を合成した(GENEART社)。In-Fusion HD PCRクローニングキット(Clontech社)を用いて、pCMA-LKを制限酵素BsiWIで切断した箇所に合成したDNA断片を挿入することにより発現プラスミドを構築した。
配列番号24に示すL02のヌクレオチド配列のヌクレオチド番号37乃至402に示されるDNA断片を合成した(GENEART社)。実施例1-2-5と同様の方法で発現プラスミドを構築した。
配列番号28に示すL05のヌクレオチド配列のヌクレオチド番号37乃至402に示されるDNA断片を合成した(GENEART社)。実施例1-2-5と同様の方法で発現プラスミドを構築した。
1-3-1:Trastuzumab A1、H01L02抗体及びHwtL05抗体の生産
FreeStyle 293F細胞(Invitrogen社)はマニュアルに従い、継代、培養をおこなった。対数増殖期の1.2×109個のFreeStyle 293F細胞(Invitrogen社)を3L Fernbach Erlenmeyer Flask(CORNING社)に播種し、FreeStyle293 expression medium(Invitrogen社)で希釈して2.0×106細胞/mLに調製した。40mLのOpti-Pro SFM培地(Invitrogen社)に0.24mgの重鎖発現プラスミドと0.36mgの軽鎖発現プラスミドと1.8mgのPolyethyleneimine(Polyscience #24765)を加えて穏やかに攪拌し、さらに5分間放置した後にFreeStyle 293F細胞に添加した。37℃、8%CO2インキュベーターで4時間、90rpmで振とう培養後に600mLのEX-CELL VPRO培地(SAFC Biosciences社)、18mLのGlutaMAX I(GIBCO社)、及び30mLのYeastolate Ultrafiltrate(GIBCO社)を添加し、37℃、8%CO2インキュベーターで7日間、90rpmで振とう培養して得られた培養上清をDisposable Capsule Filter(Advantec #CCS-045-E1H)でろ過した。
実施例1-1-3に示した重鎖と軽鎖の組み合わせに対応する重鎖発現プラスミドと軽鎖発現プラスミドの組み合わせにより、Trastuzumab A1、H01L02抗体及びHwtL05抗体を生産した。
実施例1-3-1で得られた培養上清をrProtein Aアフィニティークロマトグラフィーの1段階工程で精製した。培養上清をPBSで平衡化したMabSelectSuReが充填されたカラム(GE Healthcare Bioscience社製)にアプライしたのちに、カラム容量の2倍以上のPBSでカラムを洗浄した。次に2Mアルギニン塩酸塩溶液(pH4.0)で溶出し、抗体の含まれる画分を集めた。その画分を透析(Thermo Scientific社、Slide-A-Lyzer Dialysis Cassette)により50mMリン酸緩衝溶液(pH6.0)へのバッファー置換を行った。Centrifugal UF Filter Device VIVASPIN20(分画分子量UF10K,Sartorius社)で抗体を濃縮し、IgG濃度を20mg/ml以上に調製した。最後にMinisart-Plus filter(Sartorius社)でろ過し、精製サンプルとした。
1-4-1:Trastuzumab改変体の結合性評価
実施例1-3で調製したTrastuzumab A1、H01L02抗体、HwtL05抗体とヒトHER2の解離定数測定は、Biacore T200(GE Healthcare Bioscience社製)を使用し、Human Antibody Capture Kit(GE Healthcare Bioscience社製)を用いて固定化したAnti‐Human IgG(Fc)antibodyに抗体をリガンドとして捕捉(キャプチャー)し、抗原をアナライトとして測定するキャプチャー法にて行った。ランニングバッファーとしてHBS-EP+(GE Healthcare Bioscience社製)、センサーチップとしてCM5(GE Healthcare Bioscience社製)を用いた。チップ上に0.1μg/mLまたは0.2μg/mLの抗体を10μL/分で60秒間添加した後、抗原としてRecombinant human HER2/ErbB2(ACRO Biosystems)の希釈系列溶液 (0.5~8μg/mL)を流速30μL/分で120秒間添加し、引き続きTrastuzumab A1に対して600秒間、H01L02に対して300秒間、HwtL05に対して120秒間の解離相をモニターした。再生溶液として、3M magnesium chloride(GE Healthcare Bioscience社製)を流速20μL/分で30秒間添加した。データの解析には1:1結合モデルを用いて、結合速度定数ka、解離速度定数kd及び解離定数(KD;KD=kd/ka)を算出した。結果を表1に示す。
実施例2
[実施例2-1:中間体1]
5-ベンジル 6-メチル(6S)-5-アザスピロ[2.4]ヘプタン-5,6-ジカルボキシレート(1-1)(104mmol,WO2012087596)のテトラヒドロフラン(500mL)溶液に、水素化ホウ素リチウム(4.30g,178mmol)を0℃にて少量ずつ加えた。0℃にて30分撹拌した後、室温にて2時間撹拌した。0℃にて水(180mL)、2規定塩酸(186mL)を加え、減圧留去した。得られた残渣を酢酸エチルで4回抽出し、有機層を飽和食塩水で洗浄した後、無水硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣(1-2)(27.9g,90%)をそのまま次の反応に用いた。
上記工程1にて得られた化合物(1-2)(27.9g,107mmol)とイミダゾール(14.5g,214mmol)のジクロロメタン(300mL)溶液に、室温にてtert-ブチルジメチルシリルクロリド(24.2g,160mmol)を加え、室温にて18時間撹拌した。反応溶液を飽和クエン酸水溶液、飽和炭酸水素ナトリウム水溶液、飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した後、減圧留去した。得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~50:50(v/v)]にて精製し、目的物(1-3)(32.5g,81%)を得た。
MS (APCI)m/z:376(M+H)+
上記工程2で得られた化合物(1-3)(32.5g,86.5mmol)のエタノール(400mL)溶液に、室温にて7.5%パラジウム炭素触媒(54%水分、5.00g)を加え、室温、水素雰囲気下にて6時間撹拌した。反応溶液をセライト濾過し、濾液を減圧留去し、目的物(1-4)(21.3g,定量的)を得た。
MS(APCI、ESI)m/z:242(M+H)+
5-メトキシ-2-ニトロ-4-{トリ(プロパン-2-イル)シリル]オキシ}安息香酸(52.2g,141mmol,US20150283262)と1-ヒドロキシベンゾトリアゾール一水和物(23.8g,155mmol)のジクロロメタン(500mL)溶液に、氷冷下にてN,N’-ジシクロヘキシルカルボジイミド(35.0g,170mmol)を加えた。反応混合物を室温にて撹拌した。カルボン酸消失後、-60℃にて上記工程3にて得られた化合物(1-4)(34.1g,141mmol)とトリエチルアミン(29.4mL,212mmol)のジクロロメタン(100mL)溶液をゆっくりと滴下した。反応溶液を室温にて一晩撹拌した後、反応混合物に飽和炭酸水素ナトリウム水溶液を加え、反応混合物をクロロホルムで抽出した。有機層を水および飽和食塩水で洗浄し、無水硫酸マグネシウムで乾燥した。減圧留去して得られた残渣に酢酸エチルとジエチルエーテルを加え、固体成分を濾過により取り除き、濾液を減圧留去し、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~25:75(v/v)]にて精製し、目的物(1-5)(55.0g,66%)を得た。
MS(APCI、ESI)m/z:593(M+H)+
上記工程4で得られた化合物(1-5)(55.0g,92.8mmol)のエタノール(300mL)溶液に、窒素雰囲気下にて、7.5%パラジウム炭素(10.0g)を加えた。窒素風船を直ちに水素風船に付け替え、反応混合物を水素雰囲気下、室温で激しく撹拌した。原料消失後、反応混合物を濾過し、濾液を減圧留去し、得られた目的物(1-6)(52.2g,100%)をそのまま次の反応に用いた。
MS(APCI、ESI)m/z:563(M+H)+
上記工程5で得られた化合物(1-6)(18.6g,33.0mmol)およびトリエチルアミン(6.26mL,45.2mmol)のTHF(300mL)溶液に、エタノール-氷浴上にて、トリホスゲン(4.22g,14.2mmol)をゆっくりと添加した。添加後、氷冷した反応混合物に、N-[(プロプ-2-エン-1-イルオキシ)カルボニル]-L-バリル-N-[4-(ヒドロキシメチル)フェニル]-L-アラニンアミド(11.4g,30.2mmol,WO2011130598)とトリエチルアミン(6.26mL,45.2mmol)のテトラヒドロフラン(100mL)、N,N-ジメチルホルムアミド(30mL)混合溶液をゆっくりと滴下した。滴下後、氷浴をはずし、反応混合物を、窒素雰囲気下、40℃にて撹拌した。原料消失後、反応混合物に水を加え、反応混合物を酢酸エチルで抽出した。有機層を飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。濾過後、減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~40:60(v/v)]にて精製し、目的物(1-7)(23.5g,74%)を得た。
MS(APCI、ESI)m/z:966(M+H)+
上記工程6で得られた化合物(1-7)(23.5g,24.3mmol)のテトラヒドロフラン(50mL),メタノール(50mL),水(44mL)溶液に、室温下にて酢酸(200mL)を加えた。反応混合物を室温にて撹拌した。原料消失後、反応混合物を酢酸エチルで抽出した。有機層を水および飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。濾過後、減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~0:100(v/v)]にて精製し、目的物(1-8)(18.0g,87%)を得た。
MS(APCI、ESI)m/z:852(M+H)+
ジメチルスルホキシド(3.75mL,52.8mmol)のジクロロメタン(300mL)溶液に、窒素雰囲気下、-78℃にて、塩化オキサリル(2.17mL,25.3mmol)をゆっくりと滴下した。滴下後、反応混合物を-78℃にて撹拌した。反応混合物に、上記工程7で得られた化合物(1-8)(18.0g,21.1mmol)のジクロロメタン(50.0mL)溶液をゆっくりと滴下した。反応溶液に-78℃にて、トリエチルアミン(14.6mL,105mmol)を加えた。添加後、冷媒浴をはずし、室温までゆっくりと昇温した。原料消失後、反応混合物に水を加え、反応混合物をクロロホルム(200mL)で抽出した。有機層を水および飽和食塩水で洗浄し、無水硫酸マグネシウムで乾燥した。濾過後、減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~0:60(v/v)]にて精製し、目的物(1-9)(16.5g,92%)を得た。
MS(APCI、ESI)m/z:850(M+H)+
上記工程8で得られた化合物(1-9)(12.0g,14.1mmol)および2,6-ルチジン(6.58mL,56.5mmol)のジクロロメタン(200mL)溶液に、窒素雰囲気下、0℃にて、トリフルオロメチルスルホン酸tert-ブチルジメチルシリル(9.73mL,42.3mmol)をゆっくりと滴下した。氷冷下、10分間撹拌した後に、氷浴をはずし、室温にて撹拌した。原料消失後、反応混合物に水を加え、反応混合物をクロロホルムで抽出した水および飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。濾過後、減圧留去して得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~25:75(v/v)]にて精製し、目的物(1-10)(8.12g,60%)を得た。
MS(APCI、ESI)m/z:964(M+H)+
上記工程9で得られた化合物(1-10)(8.12g,8.42mmol)のN,N-ジメチルホルムアミド(90mL)、水(2mL)溶液に、酢酸リチウム(0.611g,9.26mmol)を加え、室温下で撹拌した。原料消失後、反応混合物に水を加え、反応混合物を酢酸エチルで抽出した。有機層を水および飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。濾過後、減圧留去して得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~0:100(v/v)]にて精製し、目的物(1-11)(5.48g,81%)を得た。
1H-NMR(400MHz,CDCl3,20.9℃)δ:8.76-8.60(1H,m),7.45-7.44(2H,m),7.21(1H,s),7.10-7.09(2H,m),6.81-6.74(1H,m),6.65(1H,s),6.23(1H,s),6.01-5.99(1H,m),5.95-5.84(1H,m),5.41-5.20(2H,m),5.16(1H,m),4.84(1H,m),4.67-4.54(4H,m),4.05-4.03(1H,m),3.87(3H,s),3.71(1H,m),3.55-3.51(1H,m),3.26(1H,m),2.35(1H,m),2.18-2.12(1H,m),1.55-1.42(4H,m),0.97-0.92(6H,m),0.81(9H,s),0.76-0.61(4H,m),0.20-0.06(6H,m)
MS(APCI、ESI)m/z:808(M+H)+
グリシルグリシン(0.328g,2.49mmol)、N,N-ジイソプロピルエチルアミン(0.433mL,2.49mmol)のN,N-ジメチルホルムアミド(20mL)溶液に、1-{[4-(11,12-ジデヒドロジベンゾ[b,f]アゾシン-5(6H)-イル)-4-オキソブタノイル]オキシ}ピロリジン-2,5-ジオン(2-1)(1.00g,2.49mmol,Click Chemistry Tools)、水(10mL)を室温にて加え、同温度にて一晩撹拌した。減圧留去し、得られた残渣を、シリカゲルカラムクロマトグラフィー[クロロホルム~クロロホルム:メタノール:水=7:3:1(v/v/v)の分配有機層]にて精製し、目的物(0.930g,89%)を得た。
1H-NMR(DMSO-D6)δ:12.58(1H,s),8.14-8.12(1H,m),8.08-8.07(1H,m),7.69-7.68(1H,m),7.62-7.61(1H,m),7.53-7.45(3H,m),7.40-7.29(3H,m),5.05-5.01(1H,m),3.73-3.72(2H,m),3.66-3.60(3H,m),2.66-2.60(1H,m),2.33-2.24(1H,m),2.08-2.04(1H,m),1.81-1.77(1H,m).
MS(APCI、ESI)m/z:420[(M+H)+].
(2R,11aS)-8-(ベンジルオキシ)-2-{[tert-ブチル(ジメチル)シリル]オキシ}-7-メトキシ-10-{[2-(トリメチルシリル)エトキシ]メチル}-2,3-ジヒドロ-1H-ピロロ[2,1-c][1,4]ベンゾジアゼピン-5,11(10H,11aH)-ジオン(3-1)(25.5g,41.6mmol,WO2016149546)のテトラヒドロフラン(150mL)、エタノール(150mL)溶液に、窒素雰囲気下、5%パラジウム炭素(54%水分、10.0g)を加えた後、反応溶液を水素雰囲気下、室温にて三日間撹拌した。反応溶液にクロロホルムを加え、セライト濾過した後、濾液を減圧留去した。得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0(v/v)~50:50(v/v)]にて精製し、目的物(3-2)(19.4g,89%)を得た。
MS(APCI、ESI)m/z:523(M+H)+
上記工程1にて得られた化合物(3-2)(10.8g,20.7mmol)のN,N-ジメチルホルムアミド(30mL)溶液に、1,5-ジブロモペンタン(23.8g,103mmol)、炭酸カリウム(3.43g,24.8mmol)を室温で加えた。室温で3時間撹拌した後、反応溶液に水を加え、酢酸エチルで抽出した。得られた有機層を飽和食塩水で洗浄し、硫酸ナトリウムで乾燥した後、減圧留去した。得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=90:10(v/v)~50:50(v/v)]にて精製し、目的物(3-3)(14.5g,定量的)を得た。
MS(APCI、ESI)m/z:673[81Br,(M+H)+],671[79Br,(M+H)+].
上記工程2にて得られた化合物(3-3)(21.5mmol)のテトラヒドロフラン(40mL)溶液に、1mol/Lのテトラブチルアンモニウムフロリド テトラヒドロフラン溶液(28.0mL,28.0mmol)を0℃にて加えた。室温にて30分間撹拌した後、反応溶液に水を加え、酢酸エチルで抽出し、得られた有機層を飽和食塩水で洗浄した。硫酸ナトリウムで乾燥した後、減圧留去した。得られた残渣をシリカゲルカラムクロマトグラフィー[クロロホルム:メタノール=97.5:2.5(v/v)~92.5:7.5(v/v)]にて精製し、目的物(3-4)(11.3g,94%)を得た。
MS(APCI、ESI)m/z:559[81Br,(M+H)+],557[79Br,(M+H)+].
上記工程3にて得られた化合物(3-4)(11.3g,20.2mmol)、テトラブチルアンモニウムブロミド(0.325g,1.01mmol)、臭化カリウム(0.240g,2.02mmol,)を飽和炭酸水素ナトリウム水溶液(60mL)、ジクロロメタン(60mL)に溶解させ、nor-AZADO(0.0279g,0.202mmol)、次亜塩素酸ナトリウム五水和物(2.03g,27.2mmol)を0℃にて加え、0℃にて30分間撹拌した。原料が残存したため、次亜塩素酸ナトリウム五水和物(1.00g、13.4mmol)を0℃にて加え、0℃にて15分撹拌した。さらに次亜塩素酸ナトリウム五水和物(0.300g、4.03mmol)を0℃にて加え、0℃にて15分撹拌し、原料の消失をTLCにて確認した。反応溶液にチオ硫酸ナトリウム水溶液を加え、クロロホルムで抽出し、得られた有機層を硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=75:25(v/v)~40:60(v/v)]にて精製し、目的物(3-5)(9.74g,87%)を得た。
MS(APCI、ESI)m/z:557[81Br,(M+H)+],555[79Br,(M+H)+].
上記工程4にて得られた化合物(3-5)(9.74g,17.5mmol)のジクロロメタン(160mL)溶液に、2,6-ルチジン(8.17mL,70.1mmol)を-40℃にて加え、-40℃にて10分間撹拌した。反応溶液に無水トリフルオロメタンスルホン酸(8.85mL,52.6mmol)を-40℃にて加え、-40℃にて30分間撹拌した。反応溶液に10%クエン酸水溶液を加え、クロロホルムで抽出し、得られた有機層を硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=95:5→70:35]にて精製した後,NH2シリカゲルクロマトグラフィー[ヘキサン:酢酸エチル=95:5(v/v)~65:35(v/v)]にて精製し、目的物(3-6)(7.10g,59%)を得た。
MS(APCI、ESI)m/z:689[81Br,(M+H)+],687[79Br,(M+H)+].
上記工程5にて得られた化合物(3-6)(2.00g,2.91mmol)、4-メトキシフェニルボロン酸(0.884g,5.82mmol)、テトラキス(トリフェニルホスフィン)パラジウム(0)(0.336g,0.291mmol)、炭酸ナトリウム(1.23g,11.6mmol)の混合物にトルエン(20mL)、エタノール(10mL)、水(10mL)を室温にて加えた。反応溶液を室温にて30分撹拌した後、反応溶液を酢酸エチルで抽出し、水、飽和食塩水で洗浄した。有機層を硫酸ナトリウムで乾燥後、減圧留去した。得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=90:10(v/v)~50:50(v/v)]にて精製し、目的物(3-7)(1.71g,91%)を得た。
MS(APCI、ESI)m/z:647[81Br,(M+H)+],645[79Br,(M+H)+].
上記工程6にて得られた化合物(3-7)(0.789g,1.22mmol)をエタノール(10mL)、テトラヒドロフラン(10mL)に溶解し、2.0Mの水素化ホウ素リチウムテトラヒドロフラン溶液(6.11mL,12.2mmol)を0℃にて加え、0℃にて3時間撹拌した。反応溶液に水を加え、クロロホルムで抽出し、得られた有機層を硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣をジクロロメタン(10mL)、エタノール(20mL)、水(10mL)に溶解し、シリカゲル(4g)を室温にて加え、室温で4日間撹拌した。シリカゲルをろ過により除き、水を加え、クロロホルムで抽出し、得られた有機層を硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=60:40(v/v)~25:75(v/v)]にて精製し、目的物(3-8)(0.496g,81%)を得た。
MS(APCI、ESI)m/z:501[81Br,(M+H)+],499[79Br,(M+H)+].
上記工程7にて得られた化合物(3-8)(0.496g,0.992mmol)のジクロロメタン(20mL)溶液にナトリウムトリアセトキシボロヒドリド(0.421g,1.99mmol)を0℃にて加えた。室温にて2時間撹拌した後、飽和炭酸水素ナトリウム水溶液を加え、クロロホルムで抽出した。有機層を硫酸ナトリウムで乾燥し、減圧留去した後、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=60:40(v/v)~25:75(v/v)]にて精製し、目的物(3-9)(0.426g,86%)を得た。
MS(APCI、ESI)m/z:503[81Br,(M+H)+],501[79Br,(M+H)+].
上記工程8にて得られた化合物(3-9)(0.426g,0.849mmol)のジクロロメタン(30mL)溶液に、ピリジン(0.102mL1.27mmol)、クロロぎ酸アリル(0.374mL,3.54mmol)を0℃にて加え、0℃にて15分間撹拌した。反応溶液に10%クエン酸水溶液を加え、クロロホルムで抽出し、得られた有機層を飽和炭酸水素ナトリウム水溶液で洗浄後、硫酸ナトリウムで乾燥した。減圧留去し、得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=90:10(v/v)~50:50(v/v)]にて精製し、目的物(3-10)(0.465g,94%)を得た。
MS(APCI、ESI)m/z:587[81Br,(M+H)+],585[79Br,(M+H)+].
実施例2-1工程10にて得られた化合物(1-11)(0.130g,0.161mmol)と上記工程9にて得られた化合物(3-10)(0.104g,0.177mmol)のN,N-ジメチルホルムアミド(3mL)溶液に炭酸カリウム(0.0266g,0.193mmol)を室温にて加え、室温にて一晩撹拌した。反応溶液を酢酸エチルで希釈し、水、飽和食塩水で洗浄した後、硫酸ナトリウムで乾燥した。減圧留去した後、得られた残渣をNH2-シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=70:30(v/v)~0:100(v/v)]にて精製し、目的物(3-11)(0.184g,87%)を得た。
MS(APCI、ESI)m/z:1312(M+H)+
上記工程10にて得られた化合物(3-11)(0.1837g,0.140mmol)と酢酸(0.048mL,0.840mmol)のテトラヒドロフラン(5.00mL)溶液に1mol/Lのテトラブチルアンモニウムフロリド テトラヒドロフラン溶液(0.700mL,0.700mmol)を室温にて加え、室温にて3時間撹拌した。反応溶液を酢酸エチルで希釈し、有機層を飽和炭酸水素ナトリウム水溶液、飽和食塩水で洗浄した後、硫酸ナトリウムで乾燥した。減圧留去した後、得られた残渣をシリカゲルクロマトグラフィー[クロロホルム:メタノール=99.5:0.5(v/v)~95:5(v/v)]にて精製し、目的物(3-12)(0.178g、定量的)を得た。
MS(APCI、ESI)m/z:1198(M+H)+
上記工程11にて得られた化合物(3-12)(0.140mmol)のジクロロメタン(2mL)溶液に、室温にてピロリジン(0.0579mL, 0.700mmol)、テトラキス(トリフェニルホスフィン)パラジウム(0)(0.0162g, 0.0140mmol)を加え、室温にて15分撹拌した。減圧留去した後、得られた残渣をシリカゲルクロマトグラフィー[クロロホルム:メタノール=99.5:0.5(v/v)~92.5:7.5(v/v)]にて精製し、目的物(3-13)(0.143g, 99%)を得た。
MS(APCI、ESI)m/z:1030(M+H)+
実施例2-2工程1にて得られた化合物(2-2)(0.0640g, 0.153mmol)、N‐エトキシカルボニル‐2-エトキシ‐1,2‐ジヒドロキノリン(0.0446g, 0.180mmol)の混合物にジクロロメタン(2mL)を室温にて加え、室温にて15分撹拌した。反応溶液に上記工程12にて得られた化合物(3-13)(0.143g, 0.139mmol)のジクロロメタン(2mL)溶液を加え、室温にて五時間撹拌した後、減圧留去した。得られた残渣をシリカゲルクロマトグラフィークロロホルム:メタノール=99.5:0.5(v/v)~92.5:7.5(v/v)]で精製し、目的物(3-14)(0.103g, 52%)を得た。
1H-NMR(DMSO-D6)δ:9.93(1H,s),8.21-8.16(2H,m),8.07-8.04(1H,m),7.83-7.64(2H,m),7.60-7.55(3H,m),7.51-7.28(10H,m),7.19-7.16(2H,m),7.10-7.04(1H,m),6.92-6.90(2H,m),6.76-6.70(1H,m),6.39(1H,s),5.77-5.75(1H,m),5.21-5.18(1H,m),5.03-4.99(1H,m),4.82-4.79(1H,m),4.37-4.35(1H,m),4.21-4.20(2H,m),4.02-3.24(26H,m),3.16-3.13(1H,m),2.79-2.59(2H,m),2.39-2.28(2H,m),2.05-1.97(2H,m),1.91-1.77(4H,m),1.57-1.54(3H,m),1.28-1.23(3H,m),0.85-0.80(6H,m),0.67-0.61(4H,m).
MS(APCI、ESI)m/z:1431(M+H)+
実施例2-3工程1にて得られた化合物(3-2)(5.06g,9.67mmol)と1,3-ジブロモプロパン(4.93mL,48.4mmol)を、実施例2-3工程2と同様に反応させ、目的物(4-1)(4.85g,78%)を得た。
MS(APCI、ESI)m/z:645[81Br,(M+H)+],643[79Br,(M+H)+].
上記工程1にて得られた化合物(4-1)(4.85g,7.54mmol)を、実施例2-3工程3と同様に反応させ、目的物(4-2)(4.05g,定量的)を得た。
MS(APCI、ESI)m/z:531[81Br,(M+H)+],529[79Br,(M+H)+].
上記工程2にて得られた化合物(4-2)(7.54mmol)を、実施例2-3工程4と同様に反応させ、目的物(4-3)(3.73g,93%)を得た。
1H-NMR(CDCl3)δ:7.34(1H,s),7.29(1H,s),5.56-5.53(1H,m),4.72-4.69(1H,m),4.67-4.61(1H,m),4.23-4.17(3H,m),3.97-3.88(4H,m),3.82-3.75(1H,m),3.74-3.56(4H,m),2.82-2.77(1H,m),2.43-2.38(2H,m),1.06-0.94(2H,m),0.08-0.00(9H,m).
上記工程3にて得られた化合物(4-3)(3.73g,7.08mmol)を、実施例2-3工程5と同様に反応させ、目的物(4-4)(3.27g,70%)を得た。
MS(APCI、ESI)m/z:661[81Br,(M+H)+],659[79Br,(M+H)+].
上記工程4にて得られた化合物(4-4)(3.27g,4.96mmol)を、実施例2-3工程6と同様に反応させ、目的物(4-5)(2.49g,81%)を得た。
MS(APCI、ESI)m/z:619[81Br,(M+H)+],617[79Br,(M+H)+].
上記工程5にて得られた化合物(4-5)(2.49g,4.04mmol)を、実施例2-3工程7と同様に反応させ、目的物(4-6)(1.59g,84%)を得た。
MS(APCI、ESI)m/z:473[81Br,(M+H)+],471[79Br,(M+H)+].
上記工程6にて得られた化合物(4-6)(1.59g,3.38mmol)を、実施例2-3工程8と同様に反応させ、目的物(4-7)(1.39g,87%)を得た。
MS(APCI、ESI)m/z:475[81Br,(M+H)+],473[79Br,(M+H)+].
上記工程7にて得られた化合物(4-7)(1.40g,2.95mmol)を、実施例2-3工程9と同様に反応させ、目的物(4-8)(0.885g,54%)を得た。
MS(APCI、ESI)m/z:559[81Br,(M+H)+],557[79Br,(M+H)+].
上記工程8にて得られた化合物(4-8)(0.0381g,0.0683mmol)と実施例2-1工程10で得られた化合物(1-11)(0.0552g、0.0683mmol)を、実施例2-3工程10と同様に反応させ、目的物(4-9)(0.0712g,81%)を得た。
MS(APCI、ESI)m/z:1284(M+H)+.
上記工程9にて得られた化合物(4-9)(0.0712g,0.0554mmol)を、実施例2-3工程11と同様に反応させ、目的物(4-10)(0.0671g,定量的)を得た。
MS(APCI、ESI)m/z:1170(M+H)+.
上記工程10にて得られた化合物(4-10)(0.0571mmol)を、実施例2-3工程12と同様に反応させ、目的物(4-11)(0.0574g,99%)を得た。
1H-NMR(CDCl3)δ:9.16(1H,s),7.93-7.91(1H,m),7.55-7.52(1H,m),7.50-7.47(3H,m),7.35-7.32(2H,m),7.21(1H,s),7.13-7.11(2H,m),6.90-6.87(2H,m),6.40(1H,s),6.08(1H,s),5.90-5.87(1H,m),5.37-5.34(1H,m),4.73-4.53(3H,m),4.23-4.08(5H,m),3.89(3H,s),3.82(3H,s),3.78-3.72(5H,m),3.57-3.51(3H,m),3.38-3.30(3H,m),2.76-2.71(1H,m),2.36-2.24(4H,m),1.78-1.42(6H,m),1.00-0.98(3H,m),0.87-0.84(3H,m),0.74-0.62(4H,m).
MS(APCI、ESI)m/z:1002(M+H)+.
上記工程11にて得られた化合物(4-11)(0.189g,0.189mmol)と実施例2-2工程1で得られた化合物(2-2)(0.087g、0.207mmol)を、実施例2-3工程13と同様に反応させ、目的物(4-12)(0.169g,64%)を得た。
MS(APCI、ESI)m/z:1402(M+H)+.
4,4’-[1,5-ペンタンジイルビス(オキシ)]ビス(5-メトキシ-2-ニトロ安息香酸)(5-1)(5.41g,10.9mmol,Journal of Medicinal Chemistry 2004,47,1161)のジクロロメタン(50mL)溶液に、0℃にて塩化オキサリル(5.63mL,65.7mmol)を加え、N,N-ジメチルホルムアミド(0.0844mL,1.09mmol)を滴下した。反応溶液を室温まで昇温し、2時間撹拌した。減圧留去して得られた残渣をジクロロメタン(100mL)に溶解し、メチル(6S)-5-アザスピロ[2.4]ヘプタン-6-カルボキシレート塩酸塩(4.28g,24.1mmol,Tetrahedron Letters 2012. 53. 3847)とトリエチルアミン(6.07mL,43.8mmol)のジクロロメタン溶液(100mL)に窒素雰囲気下、-40℃で滴下した。反応溶液を0℃に昇温して2時間撹拌した。反応混合物に1規定塩酸(100mL)を加え、有機層を水、飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。減圧留去し、目的物(5-2)(8.40g、定量的)を得た。
MS(APCI、ESI)m/z:769(M+H)+.
上記工程1にて得られた化合物(5-2)(8.40g,10.9mmol)のテトラヒドロフラン(100mL)溶液に、水素化ほう素リチウム(714mg,32.8mmol)を加え、0℃にて30分撹拌し、室温に昇温して1時間撹拌した。0℃にて1規定塩酸を加えた後、酢酸エチルで抽出し、飽和食塩水で洗浄した後、無水硫酸ナトリウムで乾燥させた。減圧下にて溶媒留去して、目的物(5-3)(7.70g,99%)を得た。
MS(APCI、ESI)m/z:713(M+H)+.
上記工程2にて得られた化合物(5-3)(7.70g、10.8mmol)をピリジン(20mL)及び無水酢酸(10mL,105.9mmol)に溶解して、室温にて撹拌した。減圧留去して、目的物(5-4)(8.38g,97%)を得た。
MS(APCI、ESI)m/z:797(M+H)+.
上記工程3にて得られた化合物(5-4)(8.28g,10.4mmol)のN,N-ジメチルホルムアミド(100mL)溶液に、5%パラジウム炭素(54%水分、1.00g)を加えた後、反応溶液を水素雰囲気下、室温にて6時間激しく撹拌した。セライトろ過した後、ろ液を減圧留去して得られた残渣をシリカゲルカラムクロマトグラフィー[クロロホルム:メタノール=100:0(v/v)~90:10(v/v)]にて精製し、目的物(5-5)(5.05g,66%)を得た。
MS(APCI、ESI)m/z:737(M+H)+.
上記工程4にて得られた化合物(5-5)(5.05g,6.85mmol)のジクロロメタン(100mL)溶液に、ピリジン(1.10mL,13.7mmol)を加え、窒素雰囲気下、-78℃にてクロロギ酸アリル(0.725mL,6.85mmol)を加え、2時間撹拌した。減圧留去して得られた残渣をシリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=70:30(v/v)~100:0(v/v)、クロロホルム:メタノール=100:0(v/v)~90:10(v/v)]にて精製し、目的物であるモノアリルオキシカルボニル体(5-6)(2.63g,47%)を得た。
MS(APCI、ESI)m/z:821(M+H)+.
上記工程5で得られたモノアリルオキシカルボニル体(5-6)(2.00g,2.44mmol)とN-[(プロプ-2-エン-1-イルオキシ)カルボニル]-L-バリル-N-[4-(ヒドロキシメチル)フェニル]-L-アラニンアミド(1.10g,2.92mmol,WO2011130598)を、実施例2-1工程6と同様に反応させ、目的物(5-7)(2.64g,89%)を得た。
MS(APCI、ESI)m/z:1224(M+H)+.
上記工程6にて得られた化合物(5-7)(2.64g,2.16mmol)のメタノール(10mL)溶液に、炭酸カリウム(1.49g,10.8mmol)を加え、室温で3時間撹拌した。反応混合物に飽和塩化アンモニウム水溶液(100mL)を加え、酢酸エチルで抽出した。有機層を無水硫酸ナトリウムで乾燥させた。減圧留去して、目的物(5-8)(2.21g,90%)を得た。
MS(APCI、ESI)m/z:1140(M+H)+.
上記工程7にて得られた化合物(5-8)(2.03g,1.78mmol)のジクロロメタン(50mL)溶液に、デスマーチンペルヨージナン(1.59g,3.74mmol)を加え、室温で一晩撹拌した。反応混合物に飽和炭酸水素ナトリウム水溶液(100mL)を加え、クロロホルムで抽出した。有機層を無水硫酸ナトリウムで乾燥させた。減圧留去して得られた残渣をシリカゲルカラムクロマトグラフィー[クロロホルム:メタノール=100:0(v/v)~90:10(v/v)]にて精製し、目的物(5-9)(2.05g,定量的)を得た。
MS(APCI、ESI)m/z:1136(M+H)+.
上記工程8にて得られた化合物(5-9)(2.05g,1.80mmol)を、実施例2-3工程12と同様に反応させ、目的物(5-10)(1.02g,60%)を得た。
MS(APCI、ESI)m/z:950(M+H)+.
上記工程9にて得られた化合物(5-10)(0.710g,0.747mmol)と実施例2-2工程1にて得られた化合物(2-2)(0.313g、0.747mmol)をジクロロメタン(1.5mL)とメタノール(0.1mL)の混合溶媒に溶解した。4-(4,6-ジメトキシ-1,3,5-トリアジン-2-イル)-4-メチルモルホリニウムクロリド(0.264g,0.897mmol)を加え、室温で1時間撹拌した。減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[クロロホルム:メタノール=100:0(v/v)~80:20(v/v)]にて精製し目的物(5-11)(0.671g,66%)を得た。
1H-NMR(DMSO-D6)δ:9.91(1H,s),8.32(1H,s),8.23-7.91(3H,m),7.81-7.19(14H,m),7.04(1H,m),6.80-6.62(3H,m),5.77-5.75(1H,m),5.20(1H,m),5.01(1H,m),4.79(1H,m),4.46-4.35(1H,m),4.04(4H,m),3.86-3.38(18H,m),3.22-3.15(2H,m),2.67-2.63(1H,m),2.46-2.23(3H,m),2.09-1.91(2H,m),1.80-1.78(5H,m),1.57(3H,m),1.27(3H,s),1.11-1.04(1H,m),0.87-0.79(6H,m),0.63-0.55(6H,m).
MS(APCI、ESI)m/z:1351(M+H)+.
4-(ベンジルオキシ)-5-メトキシ-2-ニトロ安息香酸(6-1)(6.07g,20.0mmol,Tetrahedron 1995,51,5617)、N,N-ジメチルホルムアミド(1.08mL,13.9mmol)のジクロロメタン(100mL)溶液に、氷冷下にて塩化オキサリル(3.43mL,40.0mmol)を5分間かけて滴下した。室温にて反応溶液を5時間撹拌した後、減圧留去し、得られた残渣をジクロロメタン(20mL)に溶解させ、減圧留去した。この操作を3回繰り返した後に、残渣をジクロロメタン(5mL)に懸濁させ、これに過剰のジエチルエーテルとヘキサンを加え、ろ過し、減圧下に乾燥させることにより粗酸クロリドを得た。得られた酸クロリドをジクロロメタンに溶解させ、-40℃(ドライアイス-アセトニトリル浴)に冷却し、メチル(6S)-5-アザスピロ[2.4]ヘプタン-6-カルボキシレート塩酸塩(4.22g,22.0mmol,Tetrahedron Letters 2012.53.3847)、トリエチルアミン(3.36mL,24.2mmol)を徐々に加えた。反応混合物を一晩かけて室温にまで昇温した。反応混合物に1規定塩酸を加え、反応混合物をジクロロメタンで抽出した。有機層を水,飽和炭酸水素ナトリウム水溶液および飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0~50:50]にて精製し、目的物(6-2)(6.55g,80%)を得た。
MS(APCI、ESI)m/z:441(M+H)+
上記工程1にて得られた化合物(6-2)(6.55g,16.0mmol)のエタノール(150mL),テトラヒドロフラン(150mL)溶液に窒素雰囲気下、ラネーニッケル(7.00g)を加えた。反応混合物にヒドラジン一水和物(7mL)を加え、50℃まで徐々に昇温した。50℃にて2時間撹拌した後にラネ-ニッケル(3.00g)、ヒドラジン一水和物(3mL)を加え、1時間撹拌した。反応混合物にTHF(100mL)を加えて、セライトろ過した。減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0~25:75]にて精製し、目的物(6-3)(4.42g,73%)を得た。
MS(APCI、ESI)m/z:379(M+H)+
上記工程2にて得られた化合物(6-3)(10.0g,26.4mmol)のテトラヒドロフラン(150mL)溶液に-40℃にて、2.6mol/Lのノルマルブチルリチウムノルマルヘキサン溶液(12.0mL,31.8mmol)をゆっくりと滴下した。反応溶液を-40℃にて15分間撹拌し後、2-(クロロメトキシ)エチルトリメチルシラン(5.57mL,31.7mmol)をゆっくりと滴下した。反応溶液を室温にて3時間撹拌した後、水を加え酢酸エチルで抽出した。有機層を水および飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した。減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0~30:70]にて精製し、目的物(6-4)(11.8g,88%)を得た。
MS(APCI、ESI)m/z:509(M+H)+
上記工程3にて得られた化合物(6-4)(18.7g,36.8mmol)のテロラヒドロフラン(50mL)、エタノール(100mL)溶液に、窒素雰囲気下において5%のパラジウム炭素触媒(5.00g)を加えた。直ちに窒素風船を水素風船に付け替え、反応混合物を水素雰囲気下にて6時間撹拌した。反応混合物にクロロホルムを加えて希釈し、セライトろ過をした後、濾液を減圧留去して得られた残渣を、シリカゲルカラムクロマトグラフィー[ヘキサン:酢酸エチル=100:0~25:75]にて精製し、目的物(6-5)(15.1g,98%)を得た。
MS(APCI、ESI)m/z:419(M+H)+
上記工程4にて得られた化合物(6-5)(2.77g,6.62mmol)を、実施例2-3工程2と同様に反応させ、目的物(6-6)(3.31g,88%)を得た。
1H-NMR(CDCl3)δ:7.36(1H,s),7.25(1H,s),5.55(1H,m),4.65(1H,m),4.24-4.23(1H,m),4.11-4.03(2H,m),3.93(3H,s),3.85-3.78(1H,m),3.72-3.69(2H,m),3.46-3.39(3H,m),2.47-2.44(1H,m),2.25-2.22(1H,m),1.95-1.91(4H,m),1.67-1.59(1H,m),1.03-0.95(2H,m),0.90-0.85(1H,m),0.70-0.66(4H,m),0.05(9H,s).
上記工程5にて得られた化合物(6-6)(3.31g,5.83mmol)を、実施例2-3工程7と同様に反応させ、目的物(6-7)(1.11g,45%)を得た。
1H-NMR(CDCl3)δ:7.81(1H,m),7.53(1H,s),6.82(1H,s),4.13-4.06(2H,m),3.97(3H,s),3.88-3.83(1H,m),3.69(1H,m),3.52-3.39(3H,m),2.55-2.52(1H,m),2.06-1.89(5H,m),1.67-1.63(2H,m),0.76-0.72(4H,m).
上記工程6にて得られた化合物(6-7)(2.56g,6.08mmol)を、実施例2-3工程8と同様に反応させ、目的物(6-8)(1.15g,45%)を得た。
1H-NMR(CDCl3)δ:7.60(1H,s),6.07(1H,s),4.11-4.04(1H,m),3.99(2H,m),3.87-3.84(1H,m),3.85(3H,s),3.73(1H,m),3.58-3.53(2H,m),3.47-3.42(3H,m),2.03-1.78(6H,m),1.65-1.63(2H,m),0.77-0.56(4H,m).
上記工程7にて得られた化合物(6-8)(1.15g,2.72mmol)を、実施例2-3工程9と同様に反応させ、目的物(6-9)(1.14g,82%)を得た。
1H-NMR(CDCl3)δ:7.23(1H,s),6.69(1H,s),5.79(1H,s),5.13-5.10(2H,m),4.68-4.66(1H,m),4.48-4.45(2H,m),4.01(2H,m),3.92(3H,s),3.76(1H,m),3.54-3.37(3H,m),2.39(1H,m),1.95-1.90(4H,m),1.68-1.61(3H,m),1.44(1H,m),0.75-0.66(4H,m).
上記工程8にて得られた化合物(6-9)(0.374g,0.737mmol)と実施例2-1工程10にて得られた化合物(1-11)(0.452g、0.56mmol)を、実施例2-3工程10と同様に反応させ、目的物(6-10)(0.589g,65%)を得た。
MS(APCI、ESI)m/z:1234(M+H)+
上記工程9にて得られた化合物(6-10)(0.589g,0.477mmol)を、実施例2-3工程11と同様に反応させ、目的物(6-11)(0.382g,71%)を得た。
1H-NMR(CDCl3)δ:8.90(1H,s),7.55(2H,m),7.25-7.21(2H,m),6.74(2H,m),6.38(1H,s),5.90-5.87(5H,m),5.33-5.09(8H,m),4.66-4.60(8H,m),3.98-3.91(10H,m),3.77-3.30(12H,m),2.42-2.36(2H,m),1.77-1.39(6H,m),0.91-0.70(14H,m).
上記工程10にて得られた化合物(6-11)(0.382g,0.341mmol)を、実施例2-3工程12と同様に反応させ、目的物(6-12)(0.200g,62%)を得た。
MS(APCI、ESI)m/z:952(M+H)+
上記工程11にて得られた化合物(6-12)(0.0560g,0.0588mmol)と実施例2-2工程1にて得られた化合物(2-2)(0.022g、0.053mmol)を、実施例2-3工程13と同様に反応させ、目的物(6-13)(0.0500g,63%)を得た。
MS(APCI、ESI)m/z:1354(M+H)+
実施例3:[N3-PEG(3)]-MSG1-Ox
市販品であるmonosialo-Asn free (1S2G/1G2S-10NC-Asn、(株)糖鎖工学研究所製)(「(MSG-)Asn」と呼ぶ)(500mg)を以下の条件で逆相HPLC分離精製し、1st main peakとして溶出される(MSG1-)Asn(保持時間 15~19 min 付近)と2nd main peakとして溶出される(MSG2-)Asn(保持時間 21~26 min 付近)に分離した。0.1%ぎ酸水溶液を溶離液として使用し、装置にはELS-PDAトリガー分取システム(日本分光株式会社製)を使用し、カラムにはInertsil ODS-3(10um、30Φx250mm、GLサイエンス社製)を使用し、流速を30mL/minとした。溶出中にUV検出(210nm)された最初のピ-クのピ-クを分取し、凍結乾燥して、目的物(238mg)を得た。
上記工程1で得られた化合物(229mg)を200mMりん酸緩衝溶液(pH6.25)(1145μL)に溶解させ、EndoM(東京化成工業(株)製、1U/mL))水溶液(100μL)を加え、35℃で6日間インキュベートした。反応終了後、反応液をVIVASPIN 15R(Hydrosart膜、30K,6,000xG)を用いて限外ろ過し、得られた通過液を逆相HPLC分離精製した。0.1%トリフルオロ酢酸水溶液を溶離液として使用し、装置にはELS-PDA トリガー分取システム(日本分光株式会社製)、カラムにはInertsil ODS-3(GLサイエンス社製)を使用した。溶出中にUV検出(210nm)された目的物のピークを分取し、凍結乾燥し、目的物(117mg)を得た。
5mlサンプリングチューブ((株)イナ・オプティカ)に、11-アジド-3,6,9-トリオキサウンデカン-1-アミン(0.108mL,0.541mmol)と上記工程2で得られたMSG1(117mg,0.068mmol)の水溶液(1.2mL)を加え、1時間撹拌した後に、凍結乾燥した。凍結乾燥後の5mlサンプリングチューブに、O-(7-アザベンゾトリアゾール-1-イル)-N,N,N’,N’-テトラメチルウロニウムヘキサフルオロホスファート(103mg,0.27mmol)のN,N-ジメチルホルムアミド溶液(1.2mL)とジイソプロピルエチルアミン(0.046mL,0.27mmol)を加え、37℃で3時間撹拌した。反応終了後、あらかじめジエチルエーテル(20ml)を加えた遠沈管(50ml)に反応液を移した。小型遠心機(日立工機、CF16RX)を利用して、固形物を沈殿させ、上澄みを取り除いた。さらにジエチルエーテル(10ml)を加えて、遠心分離操作後、デカンテーションを行った。続いて、アセトニトリル(10mL)を加え、遠心分離後、デカンテーションする操作を二回繰り返した後、減圧下乾燥し、粗生成物を得た。得られた固形物を上記工程2と同様の条件にて逆相HPLC精製を行い、目的物(94.2mg)を得た。
5mLサンプリングチューブ((株)イナ・オプティカ製)に、上記工程3で合成した化合物(100mg)、2-クロロ-1,3-ジメチル-1H-ベンズイミダゾール-3-イウム-クロライド(伏見製薬所製、56mg,0.257mmol)の水溶液(520μl)を加えた。氷冷後の反応液にりん酸三カリウム(165mg,0.78mmol)の水溶液(520μl)を加え、氷冷下で3時間撹拌した。得られた反応液を、アミコンウルトラ(ウルトラセル30K、Merck Millipore製)を用いて限外ろ過し、固形物を除去した。その通過液を、ゲルろ過クロマトグラフィーにて精製した。装置にはPurif-Rp2(昭光サイエンティフィック製)を使用し、カラムにはHiPrep 26/10 Desalting(GEヘルスケア製)を使用し、移動相に0.03%-NH3水溶液を使用し、流速を10mL/min、分画容量を10mLとした。溶出中にUV検出(220nm)された目的物を含むフラクションを一つにまとめ、1N水酸化ナトリウム水溶液(104μl,0.104mmol)を加えて凍結乾燥し、目的物(84mg)を得た。
市販品である1S2G/1G2S-10NC-Asn-Fmoc((株)糖鎖工学研究所製)(「Fmoc-(MSG-)Asn」と呼ぶ)(1000mg)をエタノール/水(1/1)(10mL)に溶解させ、1規定の水酸化ナトリウム水溶液(1.75mL,4当量)を加え、室温で3時間撹拌した。反応終了後、反応液をアミコンウルトラ(30K、ミリポア社製)を用いて限外ろ過し、固形物を除去し、得られた通過液に1N塩酸(832μl,1.9当量)加えた。高速濃縮装置V-10(Biotage社製)を用いて、溶媒を除去した。アセトニトリルを加えて、高速濃縮装置V-10(Biotage社製)を用いて、溶媒を除去した後に、逆相HPLC分離精製した。0.1%トリフルオロ酢酸水溶液と0.1%トリフルオロ酢酸アセトニトリル溶液を溶離液とし、装置にはPurif-Rp2(昭光サイエンティフィック製)を使用し、カラムにはInertsil ODS-3(GLサイエンス製)を使用した。溶出中にUV検出(220nm)された目的物を含むフラクションを一つにまとめ、凍結乾燥した。再び、純水に溶解させると、pH試験紙で酸性であることが確認されたので、18%アンモニア水(150μl)を加え、pH試験紙で塩基性になったことを確認し、再び凍結乾燥した。得られた目的物(840mg)をそのまま次の反応に用いた。
工程1にて得られた化合物(840mg)を200mMりん酸緩衝溶液(pH6.25)(6000μL)に溶解させ、EndoM(東京化成工業(株)製、1U/mL))水溶液(200μL)を加え、28℃で26時間インキュベートした。反応が完了していないため、EndoM(東京化成工業(株)製、1U/mL))水溶液(50μL)を加え、28℃で2時間インキュベートした後に、反応が完了するまで室温で放置した。反応終了後、反応液をアミコンウルトラ(30K、ミリポア社製)を用いて限外ろ過した。得られた通過液にトリフルオロ酢酸(80μl)加え、逆相HPLC分離精製した。0.1%トリフルオロ酢酸水溶液と0.1%トリフルオロ酢酸アセトニトリル溶液を溶離液とし、装置にはPurif-Rp2(昭光サイエンティフィック製)を使用し、カラムにはInertsil ODS-3(GLサイエンス製)を使用した。溶出中にUV検出(220nm)された目的物を含むフラクションを一つにまとめ、凍結乾燥した。残留トリフルオロ酢酸を除く目的で、再度純水に溶解させ、目的化合物(618mg)を無色固体として得た。
ESI-MS: Calcd for C66H110N4O49 : [M+H]+ 1743.62, Found 1743.63
上記工程2にて得られた化合物(120mg)を用いて、実施例3工程3と同様の手法に従って、目的物(88.6mg)を得た。
ESI-MS: Calcd for C73H124N8O51 :[M+2H]2+ 965.37, Found 965.37
上記工程3にて得られた合成した化合物(100mg)を用いて、実施例3工程4と同様の手法に従って、目的物(88mg)を得た。
5mlサンプリングチューブ((株)イナ・オプティカ)に、11-アジド-3,6,9-トリオキサウンデカン-1-アミン(0.096mL,0.485mmol)、ジシアロオクタサッカリド(50mg,0.24mmol)の水溶液(0.5mL)を加え、1時間撹拌した後に、凍結乾燥した。凍結乾燥後の5mlサンプリングチューブに、O-(7-アザベンゾトリアゾール-1-イル)-N,N,N’,N’-テトラメチルウロニウムヘキサフルオロホスファート(92mg,0.24mmol)のN,N-ジメチルホルムアミド溶液(0.6mL)とジイソプロピルエチルアミン(0.042mL,0.24mmol)を加え、37℃で4時間撹拌した。反応終了後、あらかじめジエチルエーテル(20ml)を加えた遠沈管(50ml)に反応液を移した。小型遠心機(日立工機、CF16RX)を利用して、固形物を沈殿させ、上澄みを取り除いた。ジエチルエーテル(20ml)を加えて、デカンテーションした。続いて、アセトニトリル(20mL)を加えて、デカンテーションした後に、減圧下乾燥し、粗生成物を得た。得られた固形物を適量の0.2%トリフルオロ酢酸水溶液に溶解させ、逆相HPLC分離精製した。0.1%トリフルオロ酢酸水溶液と0.1%トリフルオロ酢酸アセトニトリル溶液を溶離液とし、装置にはPurif-Rp2(昭光サイエンティフィック製)を使用し、カラムにはInertsil ODS-3(GLサイエンス製)を使用した。溶出中にUV検出(220nm)された目的物を含むフラクションを一つにまとめ、凍結乾燥して、目的物(42mg)を得た。
5mLサンプリングチューブ((株)イナ・オプティカ製)に、上記工程1で合成した化合物(40mg)、2-クロロ-1,3-ジメチル-1H-ベンズイミダゾール-3-イウム-クロライド(伏見製薬所製、17.9mg,0.083mmol)の水溶液(200μl)を加えた。氷冷後の反応液にりん酸三カリウム(52.6mg,0.25mmol)の水溶液(200μl)を加え、氷冷下で2時間撹拌した。得られた反応液を、アミコンウルトラ(ウルトラセル30K、 Merck Millipore製)を用いて限外ろ過し、固形物を除去した。その通過液を、ゲルろ過クロマトグラフィーにて精製した。装置にはPurif-Rp2(昭光サイエンティフィック製)を使用し、カラムにはHiPrep 26/10 Desalting(GEヘルスケア製)を使用し、移動相に0.03%-NH3水溶液を使用し、流速を10mL/min、分画容量を10mLとした。溶出中にUV検出(220nm)された目的物を含むフラクションを一つにまとめ、1N水酸化ナトリウム水溶液(33μl,0.033mmol)を加えて凍結乾燥し、目的物(34mg)を得た。
実施例6:Trastuzumab A1又はA2抗体- [MSG1-N3]2
実施例1-3で調製したTrastuzumab A1抗体溶液ca.22.3mg/mL(50mMりん酸緩衝液(pH6.0))(2.69mL)に、7.7mg/mL野生型EndoS溶液(PBS)を0.156mL加え、37℃で4時間インキュベートした。反応の進行具合をExperion電気泳動ステーション(BIO-RAD製)を用いて確認した。反応終了後、以下の方法に従い、アフィニティークロマトグラフィーによる精製とハイドロキシアパタイトカラムによる精製を行った。
(1)アフィニティークロマトグラフィーによる精製
精製装置:AKTA avant(GEヘルスケア製)
カラム:HiTrap rProtein A FF(5mL)(GEヘルスケア製)
流速:5mL/min(チャージ時は1.25mL/min)
上記で得た反応液を複数回に分けて精製した。カラムへの結合時は、反応液をカラム上部へ添加し、結合バッファー(20mMりん酸緩衝液(pH6.0))を1.25mL/minで4CV(Column Volume)流し、更に5mL/minで5CV流した。中間洗浄時は、洗浄溶液(20mMりん酸緩衝液(pH7.0)、0.5M塩化ナトリウム溶液)を15CV流した。溶出時は、溶出バッファー(ImmunoPure IgG Eution buffer、PIERCE製)を6CV流した。溶出液を1Mトリス緩衝液(pH9.0)で直ちに中和した。目的物を含むフラクションを共通操作Cを用いて、5mMりん酸緩衝液50mM-モルホリノエタンスルホン酸(MES)溶液(pH6.8)への緩衝液交換を行った。
(2)ハイドロキシアパタイトクロマトグラフィーによる精製
精製装置:AKTA avant(GE ヘルスケア製)
カラム:Bio-Scale Mini CHT Type Iカートリッジ(5mL)(BIO-RAD製)
流速:5mL/min(チャージ時は1.25mL/min)
上記(1)で得られた溶液をカラムの上部へ添加し、A液(5mMりん酸緩衝液50mM-モルホリノエタンスルホン酸(MES)溶液(pH6.8))を1.25mL/minで4CV流し、更に5mL/minで3CV流した。その後、A液とB液(5mMりん酸緩衝液50mM-モルホリノエタンスルホン酸(MES)溶液(pH6.8)、2M塩化ナトリウム溶液)を用いて、溶出した。溶出条件は、A液:B液=100:0~0:100(15CV)である。さらに、洗浄溶液(500mMりん酸緩衝液(pH6.5))を5CV流した。
目的物を含むフラクションを共通操作Cを用いて緩衝液交換を行い、6.08mg/mLの(Fucα1,6)GlcNAc-TrastuzumabA1抗体溶液(50mMリン酸緩衝液(pH6.0))(6.10mL)を得た。
上記工程1にて得られた6.08mg/mL(Fucα1,6)GlcNAc-Trasutuzumab A1抗体溶液(50mMりん酸緩衝液(pH6.0))(6.10mL)に、実施例3工程4で合成した糖鎖(9.78mg)の50mMりん酸緩衝液(pH6.0)溶液(0.200mL)、5.80mg/mLのEndoS D233Q/Q303L溶液(PBS)(0.128mL)を加えて、30℃で3時間インキュベートした。反応の進行具合をExperion電気泳動ステーション(BIO-RAD製)を用いて確認した。反応終了後、上記工程1と同様にアフィニティークロマトグラフィーによる精製とハイドロキシアパタイトクロマトグラフィーによる精製を行った後、目的物を含むフラクションを共通操作Cを用いてりん酸緩衝生理食塩水(pH6.0)へ緩衝液交換を行い、10.2mg/mLのTrasutuzumab A1抗体[MSG1-N3]2溶液(りん酸緩衝生理食塩水(pH6.0))(3.65mL)を得た。
Trastuzumab A2抗体(実施例1)を用いて、実施例6の工程1及び2と同様の操作を行うことによってTrasutuzumab A2抗体- [MSG1-N3]2を得た。
実施例1-3で調製したH01L02抗体溶液ca.24.3mg/mL(50mリン酸緩衝溶液(pH6.0))(1.65mL)を用いて、上記実施例6工程1と同様の操作を行い、20.0mg/mLの(Fucα1,6)GlcNAc-H01L02抗体溶液(50mMりん酸緩衝液(pH6.0))(1.48mL)を得た。
上記工程1で得られた20.0mg/mL(Fucα1,6)GlcNAc-H01L02抗体溶液(50mMりん酸緩衝液(pH6.0))(1.48mL)を用いて、実施例6工程2と同様の操作を行うことによって、10.0mg/mL H01L02抗体-[MSG1-N3]2溶液(リン酸緩衝生理食塩水(pH6.0))(1.5mL)を得た。
実施例1-3で調製した抗HwtL05抗体溶液ca.24.5mg/mL(50mリン酸緩衝溶液(pH6.0))(3.00mL)を用いて、上記実施例6工程1と同様の操作を行い、20.39mg/mLの(Fucα1,6)GlcNAc-HwtL05抗体溶液(50mMりん酸緩衝液(pH6.0))(2.8mL)を得た。
上記工程1で得られた20.39mg/mL(Fucα1,6)GlcNAc-HwtL05抗体溶液(50mMりん酸緩衝液(pH6.0))(2.1mL)を用いて、実施例6工程2と同様の操作を行うことによって、10.04mg/mL HwtL05抗体-[MSG1-N3]2溶液(リン酸緩衝生理食塩水(pH6.0))(4.0mL)を得た。
実施例9:ADC1
ADC1は、下記の反応式に示すように実施例6工程2で得られた抗体と実施例2-3で得られた薬物リンカー1(3-14)をコンジュゲーションすることによって合成した。式中、Rは実施例で用いられた薬物リンカーを示す。
実施例6工程2にて得られた抗体のリン酸緩衝生理食塩水(pH6.0)溶液(10.0mg/mL,0.40mL)に、室温にて1,2-プロパンジオール(0.767mL)、実施例2-3工程13にて得られた化合物(3-14)の10mMジメチルスルホキシド溶液(0.033mL;抗体1分子に対して12当量)を加え、チューブローテーター(MTR-103、アズワン株式会社)を用いて、室温にて48時間反応させた。
精製操作:上記溶液を後述の共通操作Dを用いて精製を行い、目的の化合物を有する溶液を7.00mL得た。
特性評価:共通操作E,Fを用いて下記の特性値を得た。
抗体濃度:0.48mg/mL,抗体収量:3.39mg(85%),抗体一分子あたりの平均薬物結合数(n):1.7
ADC2は、下記の反応式に示すように実施例7工程2で得られた抗体と実施例2-3工程13で得られた薬物リンカー1(3-14)をコンジュゲーションすることによって合成した。式中、Rは実施例で用いられた薬物リンカーを示す。
実施例7工程2にて得られた抗体のリン酸緩衝生理食塩水(pH6.0)溶液(10.0mg/mL,400μL)に、室温にて1,2-プロパンジオール(200μL)、実施例2-3工程13にて得られた化合物(3-14)の10mM N,N-ジメチルホルムアミド溶液(33.1μL;抗体1分子に対して12当量)と1,2-プロパンジオール(167μL)の混合溶液を加え、チューブローテーター(MTR-103、アズワン株式会社)を用いて、室温にて48時間反応させた。
精製操作:上記溶液を共通操作Dを用いて精製を行い、目的の化合物を有する溶液を2.5mL得た。
特性評価:共通操作E,Fを用いて下記の特性値を得た。
抗体濃度:1.08mg/mL,抗体収量:2.71mg(68%),抗体一分子あたりの平均薬物結合数(n):1.9
ADC3は、下記の反応式に示すように実施例8工程2で得られた抗体と実施例3工程13で得られた薬物リンカー1(3-14)をコンジュゲーションすることによって合成した。式中、Rは実施例で用いられた薬物リンカーを示す。
工程1:抗体と薬物リンカーのコンジュゲーション
実施例8工程2にて得られた抗体のリン酸緩衝生理食塩水(pH6.0)溶液(10.04mg/mL,0.400mL)に、室温にて1,2-プロパンジオール(0.367mL)、実施例2-3工程13にて得られた化合物(3-14)の10mMジメチルスルホキシド溶液(0.033mL;抗体1分子に対して12当量)を加え、チューブローテーター(MTR-103、アズワン株式会社)を用いて、室温にて48時間反応させた。
精製操作:上記溶液を共通操作Dを用いて精製を行い、目的の化合物を有する溶液を2.50mL得た。
特性評価:共通操作E,Fを用いて下記の特性値を得た。
抗体濃度:0.89mg/mL,抗体収量:2.22mg(55%),抗体一分子あたりの平均薬物結合数(n):1.8
ADC4は、実施例6工程2で得られたTrasutuzumab A2抗体- [MSG1-N3]2と実施例2-3で得られた薬物リンカー1(3-14)をコンジュゲーションすることによって合成した。式中、Rは実施例で用いられた薬物リンカーを示す。
実施例6工程2にて得られたTrastuzumab A2抗体- [MSG1-N3]2(重鎖アミノ酸配列:配列番号31、軽鎖アミノ酸配列:配列番号32)のリン酸緩衝生理食塩水(pH6.0)溶液(10.0mg/mL,0.50mL)に、室温にて1,2-プロパンジオール(0.486mL)、実施例2-3工程13にて得られた化合物(3-14)の10mMジメチルスルホキシド溶液(0.014mL;抗体1分子に対して4当量)を加え、チューブローテーター(MTR-103、アズワン株式会社)を用いて、室温にて40時間反応させた。
精製操作:上記溶液を後述の共通操作Dを用いて精製を行い、目的の化合物を有する溶液を2.50mL得た。
特性評価:共通操作E,Fを用いて下記の特性値を得た。
抗体濃度:1.12mg/mL,抗体収量:2.80mg(56%),抗体一分子あたりの平均薬物結合数(n):1.8
実施例6工程2にて得られたTrastuzumab A2抗体- [MSG1-N3]2(重鎖アミノ酸配列:配列番号31、軽鎖アミノ酸配列:配列番号32)のリン酸緩衝生理食塩水(pH6.0)溶液(10.0mg/mL,0.50mL)に、室温にて1,2-プロパンジオール(0.486mL)、実施例2-3工程13にて得られた化合物(3-14)の10mMジメチルスルホキシド溶液(0.014mL;抗体1分子に対して12当量)を加え、チューブローテーター(MTR-103、アズワン株式会社)を用いて、室温にて40時間反応させた。
精製操作:上記溶液を後述の共通操作Dを用いて精製を行い、目的の化合物を有する溶液を2.50mL得た。
特性評価:共通操作E,Fを用いて下記の特性値を得た。
抗体濃度:1.13mg/mL,抗体収量:2.82mg(56%),抗体一分子あたりの平均薬物結合数(n):1.8
HER2抗原陽性細胞のヒト乳癌株であるKPL-4細胞(川崎医科大学・紅林淳一、British Journal of Cancer,(1999)79(5/6).707-717)を、10%のウシ胎児血清(Hyclone)を含むRPMI1640 Medium(Thermo Fisher Scientific;以下、RPMI培地)で6.25×103Cells/mLになるように調製し、96穴細胞培養用マイクロプレートに80μLずつ添加した。細胞添加後、37℃、5%CO2下で一晩培養した。
翌日、RPMI培地で100nM、20nM、4nM、0.8nM、0.16nM、0.032nM、6.4pM、1.3pM、0.26pMに希釈した抗HER2抗体‐薬物コンジュゲートADC1, ADC2, ADC3をマイクロプレートに20μLずつ添加した。抗体‐薬物コンジュゲート非添加ウェルにはRPMI培地を20μLずつ添加した。KPL-4は37℃、5%CO2下で6日間培養した。培養後、マイクロプレートをインキュベーターから取り出して室温で30分間静置した。培養液と等量のCellTiter-Glo Luminescent Cell Viability Assay(Promega)を添加してプレートミキサーで攪拌した。室温で10分間静置後にプレートリーダー(PerkinElmer)で発光量を計測した。
生細胞率は次式で算出した。
生細胞率(%)=a÷b×100
a:被験物質添加ウェルの発光量の平均値
b:培地添加ウェルの発光量の平均値
IC50値は次式で算出した。
IC50(nM)=antilog((50-d)×(LOG10(b)-LOG10(a))÷(d-c)+LOG10(b))
a:被験物質の濃度a
b:被験物質の濃度b
c:濃度aの被験物質を添加した時の生細胞率
d:濃度bの被験物質を添加した時の生細胞率
a、bは生細胞率50%を挟む2点でa>b。
KPL-4細胞に対して抗体‐薬物コンジュゲートADC1, ADC2は0.001<IC50<0.01(nM)の抗細胞効果、ADC3は0.01<IC50<0.1(nM)の抗細胞効果を示した。
HER2抗原陽性細胞のヒト乳癌株であるJIMT-1細胞(Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH;DSMZ ACC 589))を、10%のウシ胎児血清(Hyclone)を含むDMEM Medium (Thermo Fisher Scientific;以下、DMEM培地)で1.3×104 Cells/mLになるように調製し、96穴細胞培養用マイクロプレートに80μLずつ添加した。細胞添加後、37℃、5%CO2下で一晩培養した。
翌日、DMEM培地で100nM、20nM、4nM、0.8nM、0.16nM、0.032nM、6.4pM、1.3pM、0.26pMに希釈した抗HER2抗体‐薬物コンジュゲートADC1, ADC2, ADC3をマイクロプレートに20μLずつ添加した。抗体‐薬物コンジュゲート非添加ウェルにはDMEM培地を20μLずつ添加した。JIMT-1は37℃、5%CO2下で6日間培養した。培養後、マイクロプレートをインキュベーターから取り出して室温で30分間静置した。培養液と等量のCellTiter-Glo Luminescent Cell Viability Assay (Promega)を添加してプレートミキサーで攪拌した。室温で10分間静置後にプレートリーダー(PerkinElmer)で発光量を計測した。実施例13と同じ式を用いて、生細胞率を算出した。
JIMT-1細胞に対して抗体‐薬物コンジュゲートADC1、ADC2は0.1<IC50<1(nM)の抗細胞効果、ADC3は1<IC50<10(nM)の抗細胞効果を示した。
HER2抗原陽性細胞のヒト乳癌株である KPL-4細胞(川崎医科大学・紅林淳一、British Journal of Cancer, (1999)79(5/6). 707-717)を、10%のウシ胎児血清(Hyclone)を含むRPMI1640 Medium (Thermo Fisher Scientific;以下、RPMI培地)で6.25×103 Cells/mLになるように調製し、96穴細胞培養用マイクロプレートに80μLずつ添加した。細胞添加後、37℃、5%CO2下で一晩培養した。
翌日、RPMI培地で100nM、20nM、4nM、0.8nM、0.16nM、0.032nM、6.4pM、1.3pM、0.26pMに希釈した抗HER2抗体‐薬物コンジュゲートADC4をマイクロプレートに20μLずつ添加した。抗体‐薬物コンジュゲート非添加ウェルにはRPMI培地を20μLずつ添加した。KPL-4は37℃、5%CO2下で6日間培養した。培養後、マイクロプレートをインキュベーターから取り出して室温で30分間静置した。培養液と等量のCellTiter-Glo Luminescent Cell Viability Assay (Promega)を添加してプレートミキサーで攪拌した。室温で10分間静置後にプレートリーダー(PerkinElmer)で発光量を計測した。実施例13と同じ式を用いて、生細胞率を算出した。
KPL-4細胞に対して抗体‐薬物コンジュゲートADC4は0.001<IC50<0.01 (nM)の抗細胞効果を示した。
マウス:4-5週齢の雌BALB/c ヌードマウス(日本チャールズ・リバー)を実験使用前にSPF条件下で4-7日間馴化した。マウスには滅菌した固形飼料(FR-2,Funabashi Farms Co.,Ltd)を給餌し、滅菌した水道水(5-15 ppm次亜塩素酸ナトリウム溶液を添加して調製)を与えた。
測定・計算式:全ての研究において、腫瘍の長径及び短径を電子式デジタルキャリパー(CD-15CX,Mitutoyo Corp.)で一週間に2-3回測定し、腫瘍体積(mm3)を計算した。計算式は以下に示すとおり。
腫瘍体積(mm3)=長径(mm) × [短径(mm)]2 × 1/2
抗体‐薬物コンジュゲート及び抗体は全て10mM-Acetate Buffer,5% Sorbitol,pH5.5 (ナカライテスク株式会社;ABS緩衝液)で希釈し、10mL/kgの液量を尾静脈内投与した。また、コントロール群(Vehicle群)としてABS緩衝液を同様に投与した。
KPL-4細胞(川崎医科大学・紅林淳一、British Journal of Cancer,(1999)79(5/6).707-717)をDulbecco’s phosphate buffered saline (Sigma-Aldrich)に懸濁し、1.5×107cellsを雌ヌードマウスの右体側部に皮下移植し(Day0)、Day14に無作為に群分けを実施した。抗HER2抗体‐薬物コンジュゲートADC1、又はADC2をDay14に0.33mg/kgの用量で尾静脈内投与した。また、コントロール群(Vehicle群)としてABS緩衝液を同様に投与した。
結果を図18に示す。抗HER2抗体‐薬物コンジュゲートADC1、ADC2はいずれも0.33mg/kg投与で腫瘍増殖抑制効果を示した。また、腫瘍増殖抑制効果の強さはADC2、ADC1の順であった。抗HER2抗体‐薬物コンジュゲートADC1、ADC2はいずれも0.33mg/kg投与によるマウスの体重減少は認められなかった。
JIMT-1細胞(DSMZ ACC 589)を生理食塩水(株式会社大塚製薬工場)に懸濁し、5×106cellsを雌ヌードマウスの右体側部に皮下移植し(Day0)、Day11に無作為に群分けを実施した。抗HER2抗体‐薬物コンジュゲートADC1、又はADC2をDay11に0.4mg/kgの用量で尾静脈内投与した。また、コントロール群(Vehicle群)としてABS緩衝液を同様に投与した。
結果を図19に示す。抗HER2抗体‐薬物コンジュゲートADC1、又はADC2は0.4mg/kg投与時に腫瘍の退縮を伴う強い抗腫瘍効果を認めた。また、いずれの投与用量においても抗HER2抗体‐薬物コンジュゲートADC1、又はADC2投与によるマウスの体重減少は認められなかった。
CFPAC-1細胞(American Type Culture Collection;ATCC CRL-1918)を生理食塩水(株式会社大塚製薬工場)に懸濁し、5×106cellsを雌ヌードマウスの右体側部に皮下移植し(Day0)、Day10に無作為に群分けを実施した。抗HER2抗体‐薬物コンジュゲートADC1、又はADC2をDay10に0.4mg/kgの用量で尾静脈内投与した。また、コントロール群(Vehicle群)としてABS緩衝液を同様に投与した。
結果を図20に示す。抗HER2抗体‐薬物コンジュゲートADC1を投与したマウスにおいて、腫瘍の退縮を伴う強い抗腫瘍効果が認められた。抗HER2抗体‐薬物コンジュゲートADC2を投与したマウスにおいては腫瘍増殖抑制効果を認めた。抗HER2抗体‐薬物コンジュゲートADC1、又はADC2投与によるマウスの体重減少は認められなかった。
実施例19:抗体‐薬物コンジュゲートの抗腫瘍試験(4)
KPL-4細胞(川崎医科大学・紅林淳一、British Journal of Cancer,(1999)79(5/6).707-717)を生理食塩水(株式会社大塚製薬工場)に懸濁し、1.5×107cellsを雌ヌードマウスの右体側部に皮下移植し(Day0)、Day14に無作為に群分けを実施した。抗体‐薬物コンジュゲートADC5をDay14に0.4mg/kgの用量で尾静脈内投与した。また、コントロール群(Vehicle群)としてABS緩衝液を同様に投与した。
結果を図23に示す。抗体‐薬物コンジュゲートADC5は0.4mg/kg投与で腫瘍退縮を伴う強い抗腫瘍効果を認めた。抗体‐薬物コンジュゲートADC5は0.4mg/kg投与によるマウスの体重減少は認められなかった。
配列番号2:Trastuzumab A1及びA2の重鎖及びHwtL05抗体重鎖のCDRH2のアミノ酸配列
配列番号3:Trastuzumab A1及びA2の重鎖及びHwtL05抗体重鎖のCDRH3のアミノ酸配列
配列番号4:H01L02抗体重鎖のCDRH3のアミノ酸配列
配列番号5:Trastuzumab A1及びA2の軽鎖のCDRL1のアミノ酸配列
配列番号6:Trastuzumab A1及びA2の軽鎖のCDRL2を含むアミノ酸配列
配列番号7:Trastuzumab A1及びA2の軽鎖のCDRL3のアミノ酸配列
配列番号8:H01L02抗体及びHwtL05抗体軽鎖のCDRL3のアミノ酸配列
配列番号9:ヒト軽鎖シグナル配列及びヒトκ鎖定常領域をコードするDNA配列を含むDNA断片のヌクレオチド配列
配列番号10:ヒト重鎖シグナル配列及びヒトIgG1LALA定常領域のアミノ酸をコードするDNA配列を含むDNA断片のヌクレオチド配列
配列番号11:Trastuzumab A1の重鎖アミノ酸配列
配列番号12:Trastuzumab A1の重鎖をコードするヌクレオチド配列
配列番号13:Trastuzumab A1、A2及びHwtの重鎖可変領域アミノ酸配列
配列番号14:Trastuzumab A1、A2及びHwtの重鎖可変領域をコードするヌクレオチド配列
配列番号15:H01のアミノ酸配列
配列番号16:H01をコードするヌクレオチド配列
配列番号17:H01の重鎖可変領域アミノ酸配列
配列番号18:H01の重鎖可変領域をコードするヌクレオチド配列
配列番号19:Trastuzumab A1の軽鎖のアミノ酸配列
配列番号20:Trastuzumab A1の軽鎖をコードするヌクレオチド配列
配列番号21:Trastuzumab A1及びA2の軽鎖可変領域アミノ酸配列
配列番号22:Trastuzumab A1及びA2の軽鎖可変領域をコードするヌクレオチド配列
配列番号23:L02のアミノ酸配列
配列番号24:L02をコードするポリヌクレオチド配列
配列番号25:L02の可変領域アミノ酸配列
配列番号26:L02の可変領域をコードするヌクレオチド配列
配列番号27:L05のアミノ酸配列
配列番号28:L05をコードするポリヌクレオチド配列
配列番号29:L05の可変領域アミノ酸配列
配列番号30:L05の可変領域をコードするヌクレオチド配列
配列番号31:Trastuzumab A2の重鎖アミノ酸配列
配列番号32:Trastuzumab A2の軽鎖のアミノ酸配列
配列番号33:Trastuzumabの重鎖アミノ酸配列
配列番号34:Trastuzumabの軽鎖のアミノ酸配列
Claims (73)
- 次式;
Dは、以下の群から選択されるいずれか一つであり、
Lは、AbのAsn297に結合する糖鎖(N297糖鎖)とDを連結するリンカーであり、
N297糖鎖はリモデリングされていてもよく、
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示す。)
で示される抗体-薬物コンジュゲート。 - Lは、-Lb-La-Lp-NH-B-CH2-O(C=O)-*で示され、
ここで、式中、アステリスク*はDと結合していることを示し、
Bは、1,4-フェニル基、2, 5-ピリジル基、3,6-ピリジル基、2,5-ピリミジル基又は2,5-チエニル基であり、
Lpは、以下の群;
-GGVA-、-GG-(D-)VA-、-VA-、-GGFG-、-GGPI-、-GGVCit-、-GGVK-、及び、-GGPL-、
から選択されるいずれか一つを示し、
Laは、以下の群;
-C(=O)-CH2CH2-C(=O)-、-C(=O)-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-、
-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-、
-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-、-CH2-OC(=O)-、及び、-OC(=O)-、
から選択されるいずれか一つを示し、ならびに、
Lbは、次式で示され、
- Lが、以下の群;
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GG-(D-)VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPI-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGFG-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVK-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGPL-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-、及び
-Z3-CH2-OC(=O)-GGVA-NH-B-CH2-OC(=O)-
から選択されるいずれか一つを示し、
ここで、Bは、1,4-フェニル基を示し、
Z1は、以下の構造式;
Z2は、以下の構造式;
Z3は、以下の構造式;
ここで、Z1、Z2及びZ3の構造式において、アステリスク*は隣接するC(=O)、OC(=O)又はCH2と結合していることを示し、波線はN297糖鎖又はリモデリングされたN297糖鎖と結合していることを示す、請求項1又は2に記載の抗体-薬物コンジュゲート。 - Lが、以下の群;
-Z1-C(=O)-CH2CH2-C(=O)-GGVA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-GGVCit-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2)2-C(=O)-VA-NH-B-CH2-OC(=O)-、
-Z1-C(=O)-CH2CH2-C(=O)-NH-(CH2CH2O)2-CH2-C(=O)-VA-NH-B-CH2-OC(=O)-、及び、
-Z1-C(=O)-CH2CH2-NH-C(=O)-(CH2CH2O)4-CH2CH2-C(=O)-VA-NH-B-CH2-OC(=O)-
から選択されるいずれか一つを示し、
ここで、Bは1,4-フェニル基であり、
Z1は以下の構造式;
ここで、上記Z1の構造式において、アステリスク*はZ1に隣接するC(=O)と結合していることを示し、波線はN297糖鎖又はリモデリングされたN297糖鎖と結合していることを示す、請求項3に記載の抗体-薬物コンジュゲート。 - 抗体が、以下の(a)~(c)に記載のCDRH1、CDRH2及びCDRH3を含む重鎖、ならびに、CDRL1、CDRL2及びCDRL3を含む軽鎖を含んでなる、請求項1~5のいずれか一項に記載の抗体-薬物コンジュゲート;
(a)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、
(b)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、又は
(c)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列からなるCDRL3。 - 抗体が、以下の(a)~(d)からなる群から選択されるアミノ酸配列からなる重鎖可変領域、及び(e)~(i)からなる群から選択されるアミノ酸配列からなる軽鎖可変領域を含む、請求項1~6のいずれか一項に記載の抗体-薬物コンジュゲート;
(a)配列番号13に記載のアミノ酸配列、
(b)配列番号17に記載のアミノ酸配列、
(c)(a)又は(b)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、
(d)(a)又は(b)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列、及び、
(e)配列番号21に記載のアミノ酸配列、
(f)配列番号25に記載のアミノ酸配列、
(g)配列番号29に記載のアミノ酸配列、
(h)(e)~(g)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、及び、
(i)(e)~(g)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列。 - 抗体が、以下の(a)~(c)に記載の重鎖可変領域及び軽鎖可変領域を含む、請求項7に記載の抗体-薬物コンジュゲート;
(a)配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域、
(b)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域、又は
(c)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号21に記載のアミノ酸配列からなる軽鎖可変領域。 - 抗体が、キメラ抗体である、請求項1~8のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、ヒト化抗体である、請求項1~8のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、ヒトIgG1、ヒトIgG2又はヒトIgG4の重鎖定常領域を含む、請求項9又は10に記載の抗体-薬物コンジュゲート。
- 抗体の重鎖定常領域がヒトIgG1の重鎖定常領域であり、該重鎖定常領域においてEU Indexにより示される234位及び235位のロイシンがアラニンに置換されている、請求項11に記載の抗体-薬物コンジュゲート。
- 抗体が、以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、請求項10~12のいずれか一項に記載の抗体-薬物コンジュゲート;
(a)配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(H01L02)、又は、
(b)配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(HwtL05)。 - 抗体が、以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、請求項10~12のいずれか一項に記載の抗体-薬物コンジュゲート;
(a)配列番号11においてアミノ酸番号20乃至469に記載のアミノ酸配列からなる重鎖及び配列番号19においてアミノ酸番号21乃至234に記載のアミノ酸配列からなる軽鎖、又は、
(b)配列番号31においてアミノ酸番号20乃至469に記載のアミノ酸配列からなる重鎖及び配列番号32においてアミノ酸番号21乃至234に記載のアミノ酸配列からなる軽鎖。 - 抗体が、N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、請求項1~14のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体の重鎖のカルボキシル末端において1つ又は数個のアミノ酸残基が欠失している、請求項15に記載の抗体-薬物コンジュゲート。
- 抗体の2本の重鎖の双方のカルボキシル末端において1つのアミノ酸残基が欠失している、請求項16に記載の抗体-薬物コンジュゲート。
- 抗体が、請求項6~17のいずれか一項に記載の抗体と、HER2への結合において競合するか、又は、請求項6~17のいずれか一項に記載の抗体が認識するHER2上の部位に結合する、請求項1~5のいずれか一項に記載の抗体-薬物コンジュゲート。
- N297糖鎖が、リモデリングされた糖鎖である、請求項1~18に記載の抗体-薬物コンジュゲート。
- N297糖鎖が、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGのいずれか一つであることを示す、請求項1~19に記載の抗体-薬物コンジュゲート;
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)n5-*を示し、
ここで、n5は2~5の整数であることを示し、左端のアミノ基がN297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、アステリスク*は、LにおけるZ1のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す。 - n5が3である、請求項20に記載の抗体-薬物コンジュゲート。
- 次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク*は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。 - 次式;
(上記で示されるそれぞれの構造式において、m1は1又は2の整数であることを示し、
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク*は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。 - 次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク*は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)で示される抗体-薬物コンジュゲート。 - 次式;
Abは、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片であることを示し、
N297糖鎖は、次式で示される構造を有するN297-(Fuc)MSG1、N297-(Fuc)MSG2もしくはそれらの混合物、又はN297-(Fuc)SGであり、
N297糖鎖中のL(PEG)は、-NH-CH2CH2-(O-CH2CH2)3-*であることを示し、
ここで、左端のアミノ基が、N297糖鎖のβ-Manの分岐鎖の1-3鎖側又は/及び1-6鎖側の非還元末端のシアル酸の2位のカルボン酸とアミド結合を介して結合しており、右端のアステリスク*は、上記構造式中のトリアゾール環上の1位又は3位の窒素原子と結合していることを示す)示される抗体-薬物コンジュゲート。 - 抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、請求項22~25のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、請求項22~25のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3を含む重鎖、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、請求項22~25のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域を含む、請求項22~26のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域を含む、請求項22~25及び27 のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号21に記載のアミノ酸配列からなる軽鎖可変領域を含む、請求項22~25及び28のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖および配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、請求項22~26及び29のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖および配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、請求抗22~25、27及び30のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号11においてアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号19においてアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、請求項22~25、28及び31のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、配列番号31においてアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号32においてアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖を含む、請求項22~25、28及び31のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体が、N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、請求項22~35のいずれか一項に記載の抗体-薬物コンジュゲート。
- 配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRH3を含む重鎖、及び、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号7に記載のアミノ酸配列又は該アミノ酸配列の1~数個のアミノ酸が置換されたアミノ酸配列からなるCDRL3を含む軽鎖を含んでなる、HER2に特異的に結合する抗体又は該抗体の機能性断片。
- 以下の(a)又は(b)に記載のCDRH1、CDRH2及びCDRH3を含む重鎖、ならびにCDRL1、CDRL2及びCDRL3を含む軽鎖を含んでなる、請求項37に記載の抗体又は該抗体の機能性断片;
(a)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号4に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3、又は、
(b)配列番号1に記載のアミノ酸配列からなるCDRH1、配列番号2に記載のアミノ酸配列からなるCDRH2及び配列番号3に記載のアミノ酸配列からなるCDRH3、ならびに、配列番号5に記載のアミノ酸配列からなるCDRL1、配列番号6のアミノ酸番号1~3に記載のアミノ酸配列からなるCDRL2及び配列番号8に記載のアミノ酸配列からなるCDRL3。 - 以下の(a)~(e)からなる群から選択されるアミノ酸配列からなる重鎖可変領域、及び(f)~(k)からなる群から選択されるアミノ酸配列からなる軽鎖可変領域を含む、請求項37又は38に記載の抗体又は該抗体の機能性断片;
(a)配列番号13に記載のアミノ酸配列、
(b)配列番号17に記載のアミノ酸配列、
(c)(a)又は(b)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、
(d)(a)又は(b)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列、及び、
(e)配列番号25に記載のアミノ酸配列、
(f)配列番号29に記載のアミノ酸配列、
(g)(e)又は(f)の配列において各CDR配列以外のフレームワーク領域の配列に対して少なくとも95%以上の相同性を有するアミノ酸配列、及び
(h)(e)又は(f)の配列における各CDR配列以外のフレームワーク領域の配列において1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列。 - 以下の(a)又は(b)に記載の重鎖可変領域及び軽鎖可変領域を含む、請求項39に記載の抗体又は該抗体の機能性断片;
(a)配列番号17に記載のアミノ酸配列からなる重鎖可変領域および配列番号25に記載のアミノ酸配列からなる軽鎖可変領域、又は、
(b)配列番号13に記載のアミノ酸配列からなる重鎖可変領域および配列番号29に記載のアミノ酸配列からなる軽鎖可変領域。 - キメラ抗体である、請求項37~40のいずれか一項に記載の抗体又は該抗体の機能性断片。
- ヒト化抗体である、請求項37~40のいずれか一項に記載の抗体又は該抗体の機能性断片。
- ヒトIgG1、ヒトIgG2又はヒトIgG4の重鎖定常領域を含む、請求項41又は42に記載の抗体又は該抗体の機能性断片。
- 重鎖定常領域がヒトIgG1の重鎖定常領域であり、該重鎖定常領域においてEU Indexにより示される234位及び235位のロイシンがアラニンに置換されている、請求項43に記載の抗体又は該抗体の機能性断片。
- 以下の(a)又は(b)に記載の重鎖及び軽鎖を含む、請求項42~44のいずれか一項に記載の抗体又は該抗体の機能性断片;
(a)配列番号15のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号23のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(H01L02)、又は、
(b)配列番号11のアミノ酸番号20~469に記載のアミノ酸配列からなる重鎖及び配列番号27のアミノ酸番号21~234に記載のアミノ酸配列からなる軽鎖(HwtL05)。 - 請求項37~45のいずれか一項に記載の抗体と、HER2への結合において競合するか、又は、請求項37~45のいずれか一項に記載の抗体が認識するHER2上の部位に結合する、抗体又は該抗体の機能性断片。
- 請求項37~46のいずれか一項に記載の抗体又は該抗体の機能性断片をコードするポリヌクレオチド。
- 請求項47に記載のポリヌクレオチドを含有する発現ベクター。
- 請求項48に記載の発現ベクターにより形質転換された宿主細胞。
- 宿主細胞が、真核細胞である請求項49に記載の宿主細胞。
- 宿主細胞が、動物細胞である請求項49又は50に記載の宿主細胞。
- 請求項49~51のいずれか一項に記載の宿主細胞を培養する工程、及び当該工程で得られた培養物から目的の抗体を採取する工程を含むことを特徴とする、請求項37~46のいずれか一項に記載の抗体又は該抗体の機能性断片の製造方法。
- 請求項52に記載の製造方法により得られることを特徴とする抗体又は該抗体の機能性断片。
- N-結合型糖鎖付加、O-結合型糖鎖付加、N末のプロセッシング、C末のプロセッシング、脱アミド化、アスパラギン酸の異性化、メチオニンの酸化、N末におけるメチオニン残基の付加、プロリン残基のアミド化、及び重鎖のカルボキシル末端における1つ又は2つのアミノ酸残基の欠失からなる群より選択される1又は2以上の修飾を含む、請求項37~46及び53のいずれか一項に記載の抗体又は該抗体の機能性断片。
- 重鎖のカルボキシル末端において1つ又は数個のアミノ酸残基が欠失している、請求項54に記載の抗体又は該抗体の機能性断片。
- 2本の重鎖の双方のカルボキシル末端において1つのアミノ酸残基が欠失している、請求項55に記載の抗体又は該抗体の機能性断片。
- 重鎖のカルボキシル末端のプロリン残基が更にアミド化されている、請求項53~56のいずれか一項に記載の抗体又は該抗体の機能性断片。
- 以下の工程;
i)請求項49~51のいずれか一項に記載の宿主細胞を培養し、得られた培養物から目的の抗体を採取する工程、
ii)工程i)で得られた抗体を加水分解酵素で処理し、(Fucα1,6)GlcNAc-抗体を製造する工程、及び、
iii)MSG(9)又はSG(10)のシアル酸の2位のカルボン酸のカルボニル基にアジド基を有するPEGリンカーを導入し、且つ、還元末端をオキサゾリン化して得た糖鎖ドナー分子と、糖転移酵素存在下で(Fucα1,6)GlcNAc-抗体を反応させる工程、を含む糖鎖リモデリング抗体の製造方法。 - 更に、工程ii)の反応液を、ハイドロキシアパタイトカラムによる精製により(Fucα1,6)GlcNAc-抗体を精製する工程を含む、請求項58に記載の製造方法。
- 請求項58又は59に記載の製造方法で得られることを特徴とする、糖鎖リモデリング抗体。
- 請求項60に記載の糖鎖リモデリング抗体を薬物リンカーと反応させる工程を含む、請求項1~36のいずれか一項に記載の抗体-薬物コンジュゲートの製造方法。
- 請求項61に記載の製造方法で得られることを特徴とする、抗体-薬物コンジュゲート。
- 抗体が、請求項53~57及び60に記載のいずれか一項に記載の抗体である、請求項1~36のいずれか一項に記載の抗体-薬物コンジュゲート。
- N297糖鎖が、N297-(Fuc)MSG1である、請求項1~36、62及び63のいずれか一項に記載の抗体-薬物コンジュゲート。
- m1が、1の整数である、請求項1~36及び62~64のいずれか一項に記載の抗体-薬物コンジュゲート。
- 抗体―薬物コンジュゲートにおける抗体1分子あたりの平均薬物結合数が、1~3又は3~5である、請求項1~36及び62~65のいずれか一項に記載の抗体―薬物コンジュゲート。
- 請求項1~36及び62~66のいずれか一項に記載の抗体-薬物コンジュゲート、又は、請求項37~47、53~57及び60のいずれか一項に記載の抗体又は該抗体の機能性断片を含むことを特徴とする医薬組成物。
- 抗腫瘍薬であることを特徴とする、請求項67に記載の医薬組成物。
- 腫瘍が、HER2を発現していることを特徴とする、請求項68に記載の医薬組成物。
- 請求項1~36及び62~66のいずれか一項に記載の抗体-薬物コンジュゲート、又は、請求項37~47、53~57及び60のいずれか一項に記載の抗体又は該抗体の機能性断片を個体に投与することを特徴とする腫瘍の治療方法。
- 腫瘍が、HER2を発現していることを特徴とする、請求項70に記載の腫瘍の治療方法。
- 請求項1~36及び62~66のいずれか一項に記載の抗体-薬物コンジュゲート、又は、請求項37~47、53~57及び60のいずれか一項に記載の抗体又は該抗体の機能性断片を含む医薬組成物、及び少なくとも一つの抗腫瘍薬を、同時に、別々に又は連続して個体に投与することを特徴とする腫瘍の治療方法。
- さらなる化合物とコンジュゲートされた請求項37~47、53~57及び60のいずれか一項に記載の抗体又は該抗体の機能性断片。
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JP2021509431A JP7529654B2 (ja) | 2019-03-25 | 2020-03-24 | 抗her2抗体-ピロロベンゾジアゼピン誘導体コンジュゲート |
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