WO2021193900A1 - ポリヌクレオチド-ペプチドコンジュゲートを含む免疫誘導剤およびそれを含む医薬組成物 - Google Patents
ポリヌクレオチド-ペプチドコンジュゲートを含む免疫誘導剤およびそれを含む医薬組成物 Download PDFInfo
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Definitions
- the present invention relates to an immunoinducing agent containing a polynucleotide-peptide conjugate as an active ingredient, a pharmaceutical composition containing the same, and the like.
- TLR Toll-like receptor
- the Toll-like receptor (TLR) family present in antigen-presenting cells such as dendritic cells, macrophages, and B cells reacts with various pathogens, induces cytokine production, and differentiates naive T cells into Th1 cells. It is known to induce acquired immunity through promotion, activation of killer T cells, and the like.
- the components of pathogens recognized by a series of TLR families are diverse, and one of them is DNA having a CpG motif, which is a ligand for TLR9 (CpG DNA).
- the CpG motif is based on 6 bases in which cytosine (C) and guanine (G) are lined up in the center, and two purine bases and two pyrimidine bases are lined up before and after, and -PuPu-CG-PyPy- (Pu is The purine base is a sequence represented by Py (Py represents a pyrimidine base) (in the case of humans, GTCGTT is also known to have a ligand activity for TLR9), and it is rare in mammals. It is a base sequence often found in microorganisms. In mammals, most of the small number of CpG motifs are methylated.
- CpG DNA taken up into cells by endocytosis is recognized by TLR9 present in fagosome-like vesicles and results in Th1 cytokine production such as interferon- ⁇ (IFN- ⁇ ) and interleukin-2 (IL-2).
- Th1 cytokine production such as interferon- ⁇ (IFN- ⁇ ) and interleukin-2 (IL-2).
- IFN- ⁇ interferon- ⁇
- IL-2 interleukin-2
- Th1 reaction is strongly induced.
- the Th1 reaction suppresses allergic reactions in which the Th2 reaction is predominant, and activates macrophages and cytotoxic T cells (CTL) to have strong antitumor activity due to cell-mediated immunity.
- CTL cytotoxic T cells
- CpG DNA is also expected as an adjuvant for allergic diseases and neoplastic diseases.
- CpG DNA is covalently bound to an antigen.
- Non-Patent Document 4 describes that the conjugate of CpG DNA and an 18-24 mer peptide derived from an ovalbumin (OVA) antigen promoted uptake into dendritic cells and antigen presentation.
- Non-Patent Documents 5 and 6 describe that the conjugate of CpG DNA and OVA antigen protein induces T cell activation in vitro.
- Non-Patent Document 5 describes that antigen-specific cytotoxic activity was induced in vivo.
- Non-Patent Document 7 describes a method for producing a conjugate of a CpG oligonucleotide and a tumor-related protein or cell.
- Patent Document 1 discloses an immunoinducing agent containing a conjugate of a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif and a peptide having antigenicity as an active ingredient, and highly antigen-specific immunoinduction. It has been shown to have activity.
- Patent Document 1 the present inventors have shown that the CpG DNA-peptide conjugate has a high cytotoxic T cell (CTL) inducing ability by a study using an antigenic peptide derived from OVA. On the other hand, it has been found that when similar CpG DNA-peptide conjugates are prepared for other antigenic peptides, sufficient CTL-inducing ability may not be obtained.
- An object of the present invention is to provide an immunoinducing agent or the like capable of inducing CTL activity for a wider range of antigenic peptides.
- the present inventors added an amino acid such as cysteine to the N-terminal of the peptide for conjugatement, and as a result, MHC was originally obtained. It has been found that a peptide that was binding to a molecule (MHC-binding peptide) cannot bind to an MHC molecule. Furthermore, by using a peptide in which one or more consecutive amino acids at the N-terminal containing no anchor residue are replaced with amino acids such as cysteine, instead of a peptide in which an amino acid such as cysteine is directly added to the N-terminal of the MHC-binding peptide. , It has been found that a CpG DNA-peptide conjugate having a high CTL inducibility can be prepared. The present inventors have further studied and completed the present invention.
- the present invention includes the following inventions.
- the polynucleotide-peptide conjugate covalently binds to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side and to the peptide on the other end side.
- the peptide is a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer.
- the immunoinducing agent wherein the plurality of contiguous amino acids does not contain an anchor residue for MHC binding.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide are covalent bonds that can be cleaved in the biological environment.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the polynucleotide or polynucleotide derivative is a polynucleotide derivative in which at least a part of a phosphate diester bond is replaced with a phosphorothioate bond.
- the immunoinducing agent [19]
- An amino acid having a reactive functional group to form a covalent bond with the spacer is an analog thereof having a cysteine or thiol group.
- the covalent bond between the spacer and the peptide is a disulfide bond.
- the MHC-binding peptide is an MHC-1 -binding peptide.
- the MHC-1-binding peptide is an HLA-A-binding peptide or an HLA-B-binding peptide.
- the amino acid length of the MHC-1 binding peptide is 8 or more and 11 or less.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the base length of the polynucleotide or polynucleotide derivative is 20 or more and 30 or less.
- the spacer has a structure represented by any of the following equations.
- the immunoinducing agent [20] The immunoinducible agent according to any one of [1] to [19], further comprising a substance having immunostimulatory activity as an adjuvant. [21] A pharmaceutical composition containing the immunoinducible agent according to any one of [1] to [20]. [22] The pharmaceutical composition according to [21], which is for treating or preventing an infectious disease, a tumor, or an allergic disease.
- a method for treating or preventing an infectious disease, a tumor, or an allergic disease which comprises administering to a patient the immunoinducing agent according to any one of [1] to [20].
- a method for treating or preventing a tumor which comprises administering to a patient the immunoinducing agent according to any one of [1] to [20].
- the polynucleotide-peptide conjugate covalently binds to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side and to the peptide on the other end side.
- Consists of spacers The peptide is a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer.
- the plurality of contiguous amino acids is the polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof, which does not contain an anchor residue for MHC binding.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide is a covalent bond that can be cleaved in the biological environment.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the polynucleotide or polynucleotide derivative is a polynucleotide derivative in which at least a part of a phosphate diester bond is replaced with a phosphorothioate bond.
- An amino acid having a reactive functional group to form a covalent bond with the spacer is an analog thereof having a cysteine or thiol group.
- the covalent bond between the spacer and the peptide is a disulfide bond.
- the MHC-binding peptide is an MHC-1 -binding peptide.
- the MHC-1-binding peptide is an HLA-A-binding peptide or an HLA-B-binding peptide.
- the amino acid length of the MHC-1 binding peptide is 8 or more and 11 or less.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the base length of the polynucleotide or polynucleotide derivative is 20 or more and 30 or less.
- the spacer has a structure represented by any of the following equations.
- the present invention also provides the following [A1] to [A19].
- [A1] A polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof.
- the polynucleotide-peptide conjugate covalently binds to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side and to the peptide on the other end side.
- the peptide is a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer.
- the plurality of contiguous amino acids is the polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof, which does not contain an anchor residue for MHC binding.
- A1 The polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof.
- A3 The polynucleotide-peptide conjugate according to A1 or A2, wherein the amino acid having a reactive functional group for forming a covalent bond with the spacer is an analog thereof having a cysteine or a thiol group, or a pharmaceutical thereof. Allowable salt.
- A4 The polynucleotide-peptide conjugate according to any one of A1 to A3, or a pharmaceutically acceptable salt thereof, wherein the covalent bond between the spacer and the peptide is a disulfide bond.
- polynucleotide-peptide conjugate according to any one of A1 to A9 or a pharmaceutically acceptable salt thereof, wherein the polynucleotide or polynucleotide derivative has a base length of 15 or more and 40 or less.
- polynucleotide-peptide conjugate according to any one of A1 to A11, wherein the polynucleotide or polynucleotide derivative is a polynucleotide derivative in which at least a part of a phosphate diester bond is replaced with a phosphorothioate bond. Or its pharmaceutically acceptable salt.
- polynucleotide-peptide conjugate according to A12 wherein in the polynucleotide derivative in which at least a part of the phosphate diester bond is substituted with a phosphodiester bond, 50% or more of the phosphate diester bond is substituted with a phosphodiester bond. A gate or a pharmaceutically acceptable salt thereof.
- A14 The polynucleotide-peptide conjugate according to A13, wherein in a polynucleotide derivative in which at least a part of the phosphate diester bond is substituted with a phosphodiester bond, 90% or more of the phosphate diester bond is substituted with a phosphodiester bond.
- A15 The polynucleotide-peptide conjugate according to any one of A1 to A14, or a pharmaceutically acceptable salt thereof, wherein the spacer contains a repeating unit represented by the following formula.
- X represents an oxygen atom or a sulfur atom (where each X may be the same or different).
- R represents any of (CH 2 ) p O, (CH 2 ) q NH and (CH 2 CH 2 O) m (m, p and q each independently represent a natural number of 10 or less).
- n represents a natural number of 10 or less.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide is a covalent bond that can be cleaved in the biological environment.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the polynucleotide or polynucleotide derivative is a polynucleotide derivative in which at least a part of a phosphate diester bond is replaced with a phosphorothioate bond.
- An amino acid having a reactive functional group to form a covalent bond with the spacer is an analog thereof having a cysteine or thiol group.
- the covalent bond between the spacer and the peptide is a disulfide bond.
- the MHC-binding peptide is an MHC-1 -binding peptide.
- the MHC-1-binding peptide is an HLA-A-binding peptide or an HLA-B-binding peptide.
- the amino acid length of the MHC-1 binding peptide is 8 or more and 11 or less.
- the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- the base length of the polynucleotide or polynucleotide derivative is 20 or more and 30 or less.
- the spacer has a structure represented by any of the following equations.
- the present invention also provides the following [A20] and [A21].
- [A20] A method for producing an immunoinducing agent containing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof as an active ingredient. (1) Preparing a single-stranded polynucleotide or a polynucleotide derivative containing a CpG motif, (2) To prepare a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer, wherein the peptide is prepared.
- One or more contiguous amino acids do not contain anchor residues, and (3) the polynucleotide or polypeptide derivative of (1) and the peptide of (2) are linked via a spacer, wherein the spacer is used. Covalently binds to the polypeptide or polypeptide derivative on one end side and covalently binds to the peptide on the other end side.
- the present invention also provides the following [A22] and [A23].
- [A22] A method for producing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof. (1) Preparing a single-stranded polynucleotide or a polynucleotide derivative containing a CpG motif, (2) To prepare a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer, wherein the peptide is prepared.
- the polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof is the polynucleotide-peptide conjugate according to any one of [A1] to [A19] or a pharmaceutically acceptable salt thereof. , [A22].
- the present invention also provides the following [a1] to [a19].
- [A1] An immunoinducing agent containing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof as an active ingredient.
- the polynucleotide-peptide conjugate covalently binds to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side and to the peptide on the other end side.
- the peptide is a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer.
- the immunoinducing agent wherein the plurality of contiguous amino acids does not contain an anchor residue for MHC binding.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide are covalent bonds that can be cleaved in the biological environment.
- the immunoinducible agent according to a1].
- [A3] The immunoinducible agent according to [a1] or [a2], wherein the amino acid having a reactive functional group for forming a covalent bond with the spacer is an analog thereof having a cysteine or a thiol group.
- [A4] The immunoinducer according to any one of [a1] to [a3], wherein the covalent bond between the spacer and the peptide is a disulfide bond.
- [A5] The immunoinducer according to any one of [a1] to [a4], wherein the MHC-binding peptide is an MHC-1 -binding peptide.
- [A6] The immunoinducer according to [a5], wherein the MHC-1 binding peptide is an HLA-A binding peptide or an HLA-B binding peptide.
- [A7] The immunoinducing agent according to [a5] or [a6], wherein the amino acid length of the MHC-1 binding peptide is 8 or more and 11 or less.
- [A8] The immunoinducer according to any one of [a1] to [a4], wherein the MHC-binding peptide is an MHC-2-binding peptide.
- the immunoinducing agent according to [a10] wherein the polynucleotide or polynucleotide derivative has a base length of 20 or more and 30 or less.
- R represents any of (CH 2 ) p O, (CH 2 ) q NH and (CH 2 CH 2 O) m (m, p and q each independently represent a natural number of 10 or less).
- n represents a natural number of 10 or less.
- a wide range of antigenic peptides can be used for producing immunoinducible agents capable of inducing CTL activity.
- FIG. 1 It is a figure which shows the chromatogram in the HPLC analysis of CpG30 (S) a-mTRP2pep9 (compound 1) in Example 1. It is a figure which shows the mass spectrum in the mass spectrometry of CpG30 (S) a-mTRP2pep9 (compound 1) in Example 1.
- FIG. 2 It is a figure which shows the measurement result of the flow cytometry in Example 2 (2). It is a figure which shows the measurement result of the flow cytometry in Example 2 (3). It is a figure which shows the measurement result of the flow cytometry in Example 2 (4). It is a figure which shows the measurement result of the flow cytometry in Example 2 (5). It is a figure which shows the measurement result of the flow cytometry in Example 3.
- FIG. 1 It is a figure which shows the measurement result of the flow cytometry in Example 2 (2). It is a figure which shows the measurement result of the flow cytometry in Example 2 (3). It is a figure which shows the measurement result of
- FIG. It is a figure which shows the measurement result of the flow cytometry in Example 4.
- FIG. It is a figure which shows the measurement result of the flow cytometry in Example 4.
- FIG. It is a figure which shows the measurement result of the flow cytometry in Reference Example 1.
- FIG. It is a figure which shows the measurement result of the flow cytometry in Reference Example 2.
- FIG. It is a figure which shows the measurement result of the flow cytometry in Example 5.
- FIG. 10 It is a figure which shows the measurement result of the flow cytometry in Reference Example 3.
- FIG. 10 It is a figure which shows the measurement result of IFN- ⁇ secretion by CD4 + T cell in Example 9 and Reference Example 3. It is a figure which shows the measurement result of the flow cytometry in Example 10.
- the present invention provides an immunoinducing agent containing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof as an active ingredient (hereinafter, also referred to as an immunoinducible agent of the present invention).
- the polynucleotide-peptide conjugate in the immunoinducing agent of the present invention is covalently bonded to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side, and on the other end side. It consists of a spacer covalently bonded to the peptide.
- a "single-stranded polynucleotide or polynucleotide derivative containing a CpG motif” can be any base sequence and base as long as it contains one or more (preferably more than one, for example 2, 3, 4, 5 or 6) CpG motifs.
- Polynucleotides having a number or derivatives thereof can be used without particular limitation.
- Specific examples of the CpG motif include AGCGTT, GACGTT, GACGTC, GTCGTT and the like.
- a plurality of CpG motifs having different sequences may be included.
- the number of CpG motifs contained in the polynucleotide is not particularly limited, but preferably contains 1 to 6 CpG motifs, and more preferably 2 to 4 CpG motifs.
- the polynucleotide or polynucleotide derivative is preferably a polydeoxyribonucleotide (DNA) containing two or more CpG motifs or a phosphorothioate-modified DNA derivative, but may contain RNA or an RNA derivative in part. .. When RNA or RNA derivatives are included, their content is 20% or less in proportion to the number of bases (specifically, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9,8,7,6,5,4,3,2 or 1% or less).
- the number of bases contained in a polynucleotide or a polynucleotide derivative is 15 to 40 (specifically, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40), preferably 20 to 30 (specifically 20, 21, 22, 23, 24, 25). , 26, 27, 28, 29 or 30).
- Specific examples of the base sequences of preferred polynucleotides or polynucleotide derivatives include those shown in Table 1 below. In Table 1, the underlined arrangement represents the CpG motif.
- polynucleotide derivatives may be used instead of polynucleotides in order to improve stability in vivo.
- the polynucleotide derivative can include any modification known in the art as a modification to increase nuclease resistance and enhance in vivo stability.
- examples of polynucleotide derivatives include those in which all or part of the hydroxyl group at the 2'position of the ribonucleotide is replaced with a fluorine or methoxy group, and the phosphoric acid of the polyribonucleotide (RNA) or polydeoxyribonucleotide (DNA).
- Examples thereof include those in which all or part of the diester bond is replaced with a phosphorothioate bond. If part of the phosphate diester bond of the polyribonucleotide or polydeoxyribonucleotide is replaced by a phosphodiester bond, 50% or more of the phosphate diester bond (specifically, 50, 60, 70, 80 or 90% or more). ) Is preferably substituted with a phosphodiester bond, and 90% or more (specifically, 90, 91, 92, 93, 94, 95, 96, 97, 98 or 99% or more) is substituted with a phosphodiester bond. It is more preferable that substantially all of them are substituted with phosphodiester bonds.
- All phosphate diester bonds may be replaced with phosphodiester bonds.
- the position of the phosphate diester bond substituted by the phosphorothioate bond is not particularly limited, and a plurality of consecutive phosphate diester bonds may be substituted, or the phosphorothioate bonds may be substituted so as not to be adjacent to each other. ..
- the position where the polynucleotide or the polynucleotide derivative binds to the spacer is not particularly limited, and may be, for example, a 5'end or a 3'end.
- the functional group present in the polynucleotide or the polynucleotide derivative can be used as it is or activated by chemical modification.
- the polynucleotide or polynucleotide derivative is preferably attached to the spacer on the oxygen atom of the hydroxyl group at the 5'end or 3'end.
- the polynucleotide or polynucleotide derivative can be synthesized by using a known chemical synthesis method (for example, phosphoric acid triester method, phosphoroamideite method, H-phosphonate method, etc.). It may be synthesized by using a commercially available nucleic acid synthesizer and using a commercially available reagent used for DNA / RNA synthesis.
- a known chemical synthesis method for example, phosphoric acid triester method, phosphoroamideite method, H-phosphonate method, etc.
- one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer.
- MHC-binding peptide refers to a peptide that can bind to an MHC molecule (that is, major histocompatibility complex) and be presented as an antigen to T cells without additional processing such as trimming.
- MHC molecules include MHC-1 molecules (also referred to as MHC class I molecules) and MHC-2 molecules (also referred to as MHC class II molecules).
- MHC-1 molecules also referred to as MHC class I molecules
- MHC-2 molecules also referred to as MHC class II molecules.
- HLA molecule The MHC-1 molecule in humans is called an HLA molecule, and many alleles are present.
- the MHC-binding peptide can be either a peptide antigen-presented by the MHC-1 molecule (ie, MHC-1 -binding peptide) or a peptide antigen-presented by the MHC-2 molecule (ie, MHC-2-binding peptide).
- MHC-1 molecule ie, MHC-1 -binding peptide
- MHC-2-binding peptide a peptide antigen-presented by the MHC-2 molecule
- it is an MHC-1 binding peptide, preferably a peptide antigen-presented by the HLA-A molecule (ie, HLA-A binding peptide) or a peptide antigen-presented by the HLA-B molecule (ie, HLA-B binding peptide).
- HLA-A molecule ie, HLA-A binding peptide
- HLA-B peptide a peptide antigen-presented by the HLA-B
- the MHC-binding peptide may be derived from a protein that causes allergies such as food allergies, a pathogen such as a bacterium or a virus, or a protein originating from a tumor cell or the like.
- MHC-binding peptides include peptides listed in the public database SYFPEITHI (http://www.syfpeithi.de/0-Home.htm; see Immunogenetics (1999) 50: 213-219), Immunogenetics (1995). Examples include, but are not limited to, the peptides listed in the table 41: 178-228.
- MHC-1-binding peptide examples include OVA peptide 1 (peptide consisting of amino acid sequences 258 to 265 of Ovoalbumin (OVA; GenBank accession number: CAA23716.1), SIINFEKL (SEQ ID NO: 41)), TRP2. -9 (peptide consisting of amino acid sequence 180-188 of mTRP2 (GenBank accession number: CAA44951.1)), hGP100-9 (amino acid sequence 25-33 of hGP100 (GenBank accession number: AAC60634.1)) Peptide consisting of) and the like.
- MHC-2 binding peptide examples include OVA peptide 2 (a peptide consisting of the amino acid sequence of positions 324 to 340 of OVA, ISQAVHAAHAEINEAGR (SEQ ID NO: 42)).
- the MHC molecule has a site called a pocket that directly interacts with the MHC-binding peptide in the peptide accommodating groove.
- residues that interact with a particular pocket are called anchor residues or anchor amino acids and can be located differently depending on the type of MHC molecule to which they bind.
- the positions of anchor residues and common motifs for each type of MHC molecule are described, for example, in the public database MHC Motif Viewer (http://www.cbs.dtu.dk/biotools/MHCMotifViewer/Home.html; Immunogenetics (2008) 60: It can be confirmed by (see 759-765).
- MHC Motif Viewer http://www.cbs.dtu.dk/biotools/MHCMotifViewer/Home.html
- human MHC-1 HLA-A and HLA-B it is known that the second and ninth amino acids from the N-terminal side
- the MHC-binding peptide includes, in addition to the above-mentioned naturally occurring peptides (wild-type peptides), non-naturally occurring peptides including, for example, non-natural amino acids.
- non-naturally occurring peptides including, for example, non-natural amino acids.
- examples of such a peptide include a modified peptide (referred to as a heterocritic peptide) in which the anchor site is replaced with another amino acid (including an unnatural amino acid) in order to enhance the binding property with the MHC molecule. (See Front. Immunol. 6: 377 (2015) and J Immunol. 174 (8): 4812-4820 (2005)).
- the amino acid length of the MHC-binding peptide is not particularly limited and may vary depending on the type of MHC molecule, but may be, for example, 5 or more and 30 or less.
- the length of the peptide that binds to the MHC-1 molecule is fixed to some extent, and is usually 8 to 11 amino acids in length. Therefore, in the present invention, when the MHC-binding peptide is an MHC-1 -binding peptide, its amino acid length is preferably 8 or more and 11 or less, more preferably 8, 9 or 10, and even more preferably 9. Or 10.
- the present inventors have found that when an amino acid such as cysteine is added to the N-terminal of an MHC-binding peptide for hybridization, it may not be able to bind to an MHC molecule (Example 3). It is known that endoplasmic reticulum aminopeptidase (ERAP) is involved in the presentation of antigenic peptide by MHC-1 molecule, and the antigenic peptide precursor is usually trimmed from the N-terminal by ERAP and MHC-1. The length is suitable for binding to.
- EERAP endoplasmic reticulum aminopeptidase
- the number of N-terminal amino acids of the MHC-binding peptide substituted with an amino acid having a reactive functional group is not particularly limited as long as it does not contain an anchor residue for MHC binding, and is appropriately set according to the type of MHC molecule. be able to.
- the number of amino acids substituted can be 4 or less (4, 3, 2, or 1), preferably 1.
- the number of amino acids substituted is one because the anchor residue is located at the second position from the N-terminal. Can be.
- the "amino acid having a reactive functional group for forming a covalent bond with the spacer” is an amino acid having a reactive functional group capable of forming a covalent bond such as an ester bond, an amide bond, or a phosphate ester bond with the spacer. It may be either a natural amino acid or an unnatural amino acid.
- the covalent bond with the spacer is preferably a covalent bond that can be cleaved in the in vivo environment. Such covalent bonds include bonds that are cleaved in the intracellular reducing environment, such as disulfide bonds.
- the covalent bond can be a disulfide bond and the reactive functional group can be a thiol group.
- the "amino acid having a reactive functional group for forming a covalent bond with the spacer" can be a cysteine or an analog thereof having a thiol group.
- the cysteine analog having a thiol group is an amino acid having a thiol in the side chain, and the structure of the side chain is not particularly limited.
- cysteine analogs having a thiol group examples include homocysteine (CAS No: 6027-13-0), penicillamine ( ⁇ , ⁇ -dimethyl cysteine; CAS No: 1113-41-3), and ⁇ -methyl cysteine (CAS No.). : 29768-80-7), and 4-mercapto-norvaline (CAS No: 2351397-00-5).
- the peptide in the immunoinducing agent of the present invention can be prepared by using any known method such as peptide synthesis.
- the "spacer" in the immunoinducing agent of the present invention may have a structure capable of covalently binding to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif and a peptide, for example, an alkylene group, polyethylene glycol (PEG), or the like. Can be mentioned.
- the spacer may include a repeating unit containing a phosphate diester structure or a phosphorothioate structure represented by the following formula.
- X represents an oxygen atom or a sulfur atom (where each X may be the same or different), and R is (CH 2 ) p O, (CH 2 ) q NH, (CH 2 CH 2 O) Represents any of m (m, p and q each independently represent a natural number of 10 or less), and n represents a natural number of 10 or less.
- repeating units are not hydrolyzed by nucleases, their in vivo stability is not significantly reduced even if X is an oxygen atom.
- R is (CH 2 ) 3 O
- the size of the repeating unit is approximately equal to the size of the ribonucleotide or deoxyribonucleotide, so production by substituting a portion of the polynucleotide or polynucleotide derivative with this spacer. Cost reduction can be expected.
- Specific examples of the spacer include the following.
- a more preferable example of the spacer is one having any of the following structures.
- a more preferable example of the spacer is one having any of the following structures.
- Examples of combinations of reactive functional groups used for forming a bond between a spacer and a polynucleotide or a polynucleotide derivative, and forming a bond between a spacer and a peptide include an ester bond, an amide bond, and a phosphate ester bond.
- a combination of reactive functional groups used for immobilizing a biomolecule on the surface of a biochip can be mentioned, and more specifically, those shown below can be mentioned.
- Alkyne and azide compound form a 1,2,3-triazole ring by cycloaddition reaction (Fuisgen reaction) as shown below. Both are stable functional groups that can be introduced into many organic compounds, including biomolecules, react rapidly and almost quantitatively in solvents containing water, with few side reactions and produce no excess waste. Therefore, it is widely used in the field of biochemistry as a central reaction of so-called "click chemistry”.
- the alkyne derivative and the azide group can be introduced into an antigenic peptide or polynucleotide or polynucleotide derivative using any known method.
- alkyne derivative those having a reactive functional group such as propargyl alcohol and propargylamine can be easily obtained, and these are directly reacted with a reactive functional group such as a carboxyl group or a hydroxyl group, or reacted with carbonyldiimidazole or the like.
- the alkyne derivative can be introduced via an amide bond, an ester bond, a urethane bond, or the like that is formed.
- the azide group can also be introduced into an antigenic peptide or polynucleotide or polynucleotide derivative using any known method.
- the Huisgen reaction is carried out in the presence of a copper catalyst, but a polynucleotide derivative in which an antigenic peptide and a phosphodiester bond are replaced with a sulfur-containing functional group such as a phosphorothioate bond is coordinated to a copper ion. Due to the presence of sulfur atoms, the catalytic activity of copper may decrease. It is preferable to add an excess amount of copper in order to improve the reaction rate.
- the thiol group of the cysteine residue side chain can be used in the case of an antigenic peptide containing cysteine.
- cysteine is an amino acid having a low abundance ratio
- a peptide in which cysteine is introduced on the N-terminal side of an antigenic peptide is used.
- the polynucleotide containing a thiol group or a polynucleotide derivative a thiolated polynucleotide in which these 5'-terminal hydroxyl groups are converted into thiol groups is used.
- the introduction of the thiol group into the polynucleotide or the polynucleotide derivative can be carried out by using any known method, and specific examples thereof include an amination polynucleotide or a polynucleotide derivative as shown in the following formula.
- the reaction of the ⁇ - (2-pyridyldithio) fatty acid with the N-succiimidyl ester can be mentioned.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide is a covalent bond that can be cleaved in the biological environment, and at least with the spacer. It is preferable that the covalent bond with the peptide is a covalent bond that can be cleaved in a biological environment. Therefore, among the above (a) to (c), a disulfide bond formed by a combination of a thiol group of a peptide that can be easily cleaved in vivo and a thiol group of a thiolated polynucleotide is preferable. In this case, the disulfide bond is a covalent bond between the spacer and the peptide.
- polynucleotide-peptide conjugate in the immunoinducing agent of the present invention examples include CpG30 (S) a-mTRP2pep9 (Compound 1) and CpG20 (S) a-mTRP2pep9 (Compound 2) described in Example 1 below. And CpG30 (S) a-hGP100pep9 (Compound 3), as well as the following compounds.
- the portion represented by the base sequence indicates a DNA derivative in which the phosphate diester bond is replaced with a phosphorothioate bond.
- polynucleotide-peptide conjugate in the immunoinducing agent of the present invention include ISS1018-mTRP2pep9 and ODN2006-mTRP2pep9 described in Example 5 below, ODN1826-mTRP2pep9 and CpG30 (S) described in Example 6. Examples thereof include a2-OVApep8 and CpG30 (S) a2-mTRP2pep9, and CpG30 (S) a2-OVA2-15 described in Example 9.
- one polynucleotide or polynucleotide derivative contained in the immunoinducing agent of the present invention may be bound to two or more peptides. That is, the immunoinducing agent of the present invention may include one polynucleotide or polynucleotide derivative and two or more peptides. The polynucleotide or polynucleotide derivative and the two or more peptides may be bound to each other via a spacer. The polynucleotide or polynucleotide derivative can be attached to two or more peptides, for example, via separate spacers.
- the polynucleotide or polynucleotide derivative may be attached to two or more peptides via one branched spacer.
- One polynucleotide or polynucleotide derivative may be bound to three or more peptides by a combination of these binding modes.
- the position where the polynucleotide or the polynucleotide derivative moiety binds to the spacer is not particularly limited and may be selected from, for example, 5'ends and 3'ends.
- the two or more peptides may be the same peptide or different peptides, but it is preferable that they are all the same.
- the number of peptides that bind to a polynucleotide or polynucleotide derivative is not particularly limited and may be, for example, 2, 3, 4, 5, or more.
- the immunoinducing agent of the present invention has a polynucleotide or polynucleotide derivative having a base sequence complementary to the base sequence contained in the polynucleotide or polynucleotide derivative portion thereof (hereinafter, complementary strand polynucleotide). Alternatively, it may form a double strand with a polynucleotide derivative).
- complementary strand polynucleotide or polynucleotide derivative can be synthesized by the same method as the polynucleotide or polynucleotide derivative portion in the immunoinducing agent of the present invention.
- Complementary strand polynucleotides or polynucleotide derivatives may be modified to improve properties such as in vivo stability, toxicity, and pharmacokinetics. Such modifications include, for example, lipid modifications (see WO2017 / 057540). Compounds having lipid modifications at one or both of the 5'or 3'ends can be synthesized by the method described in Example 8. The double-stranded formation of the polynucleotide or polynucleotide derivative portion of the immunoinducator of the present invention and the complementary strand polynucleotide or polynucleotide derivative can be carried out according to a general annealing method.
- a polynucleotide-peptide conjugate is mixed with a complementary strand polynucleotide or a polynucleotide derivative, heated to a single-stranded state, and then naturally cooled to room temperature to form a double strand. Can be done.
- Examples of the pharmaceutically acceptable salt of the polynucleotide-peptide conjugate used as the active ingredient of the immunoinducing agent of the present invention include salts of alkali metals (potassium, sodium, lithium, etc.) and alkaline earth metals (calcium, Salts of magnesium, etc.), ammonium salts (including tetramethylammonium salt, tetrabutylammonium salt, etc.), organic amines (triethylamine, methylamine, dimethylamine, cyclopentylamine, benzylamine, phenethylamine, piperidine, monoethanolamine, diethanolamine, etc.
- alkali metals potassium, sodium, lithium, etc.
- alkaline earth metals calcium, Salts of magnesium, etc.
- ammonium salts including tetramethylammonium salt, tetrabutylammonium salt, etc.
- organic amines triethylamine, methylamine, dimethylamine, cyclopen
- the polynucleotide-peptide conjugate used as the active ingredient of the immunostimulant of the present invention or a pharmaceutically acceptable salt thereof can also exist as a solvate (including a hydrate).
- the solvate is not particularly limited as long as it is pharmaceutically acceptable, and examples thereof include hydrates and ethanol solvates.
- the immunoinducing agent of the present invention may further contain a substance having immunostimulatory activity as an adjuvant.
- An adjuvant is a substance that activates innate immunity, but not limited to it.
- the adjuvant is preferably an agonist of the innate immune receptor.
- the natural immunoreceptor agonist include TLR agonists (for example, TLR2 agonist, TLR3 agonist, TLR4 agonist, TLR7 agonist, TLR8 agonist, TLR9 agonist), RLR (retinoic acid-inducible gene I (RIG-1) -like receptors) agonist, and the like.
- TLR monophosphoryl lipid A
- MPL monophosphoryl lipid A
- RLR agonists include pppRNA and Poly IC RNA
- STING agonists include cGAMP, c-di-AMP, and c-di-GMP
- NLR agonists include iE-DAP, FK565, MDP, and murabide
- CLR agonists include. Examples include beta-glucan, trehalose 6, 6'-dimicolate and the like.
- the adjuvant is preferably a TLR agonist, more preferably a TLR4 agonist, a TLR7 agonist or a TLR9 agonist, and even more preferably imiquimod, reshikimod, MPL or CpG-ODN. In some embodiments, the adjuvant is imiquimod, MPL or CpG-ODN.
- the adjuvant may be appropriately selected depending on the peptide introduced into the polynucleotide-peptide conjugate, etc., but may be, for example, CpG DNA or the like, and the polynucleotide / ⁇ described in International Publication No. 2015/118789. It may be a -1,3-glucan complex.
- the immunoinducing agent of the present invention (1) Preparing a single-stranded polynucleotide or a polynucleotide derivative containing a CpG motif, (2) To prepare a peptide in which one or more consecutive amino acids at the N-terminal of the MHC-binding peptide are replaced with amino acids having a reactive functional group for forming a covalent bond with the spacer, wherein the peptide is prepared. One or more contiguous amino acids do not contain anchor residues, and (3) the polynucleotide or polypeptide derivative of (1) and the peptide of (2) are linked via a spacer, wherein the spacer is used.
- the present invention provides a method for producing an immunoinducible agent of the present invention, which comprises the above steps (1) to (3).
- an immunoinducing agent capable of inducing CTL activity can be produced using a wide range of antigenic peptides.
- the present invention also provides a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof.
- a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof can be used as an active ingredient in the immunoinducing agent of the present invention.
- the polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof can be produced by a method including steps (1) to (3) in the method for producing an immunoinducer of the present invention. Therefore, in one aspect, the present invention provides a method for producing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof, which comprises the above steps (1) to (3).
- a wide range of antigenic peptides can be used to produce a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof, which can be an active ingredient of an immunoinducing agent capable of inducing CTL activity.
- the present invention also provides a pharmaceutical composition containing the immunoinducible agent of the present invention (hereinafter, also referred to as the pharmaceutical composition of the present invention).
- a pharmaceutical composition of the present invention in addition to the polynucleotide-peptide conjugate as an active ingredient or a pharmaceutically acceptable salt thereof, any known ingredient (any carrier allowed for pharmaceutical use, shaping) is used.
- Agents and additives) and methods of formulation can be used.
- Substances for formulation include, but are not limited to: amino acids such as glycine, alanine, glutamine, asparagine, arginine or lysine, antioxidants such as ascorbic acid, sodium sulfate or sodium hydrogen sulfite.
- Phosphoric acid citric acid, borate buffer, sodium hydrogen carbonate, buffer such as Tris-HCl solution, filler such as mannitol and glycine, chelating agent such as ethylenediamine tetraacetic acid (EDTA), caffeine , Polysorbyl pyrrolidin, complexing agents such as ⁇ -cyclodextrin and hydroxypropyl- ⁇ -cyclodextrin, bulking agents such as glucose, mannitol or dextrin, other carbohydrates such as monosaccharides and disaccharides, colorants, flavoring agents, diluting Agents, hydrophilic polymers such as emulsifiers and polyvinylpyrrolidin, low molecular weight polypeptides, salt-forming counterions, benzalkonium chloride, benzoic acid, salicylic acid, timerosar, phenethyl alcohol, methylparaben, propylparaben, chlorexidine, sorbic acid or hydrogen peroxide, etc.
- Preservatives solvents such as glycerin, propylene glycol or polyethylene glycol, sugar alcohols such as mannitol or sorbitol, suspending agents, sorbitan esters, polysorbates such as polysorbate 20 and polysorbate 80, triton, tromethamine, Surfactants such as lecithin or cholesterol, stabilization enhancers such as sucrose and sorbitol, elasticity enhancers such as sodium chloride, potassium chloride and mannitol, sorbitol, transport agents, excipients, and / or pharmaceutical aids.
- solvents such as glycerin, propylene glycol or polyethylene glycol
- sugar alcohols such as mannitol or sorbitol
- suspending agents such as sorbitan esters
- polysorbates such as polysorbate 20 and polysorbate 80, triton, tromethamine
- Surfactants such as lecithin or cholesterol
- stabilization enhancers such as sucrose and
- the pharmaceutical composition of the present invention is provided as a dosage form suitable for oral or parenteral administration.
- injections, suppositories and the like are used, and the injections may include dosage forms such as intravenous injections, subcutaneous injections, intradermal injections, intramuscular injections and drip injections.
- Such injections can be prepared according to known methods.
- the immunoinducing agent of the present invention can be prepared by dissolving or suspending it in a sterile aqueous solvent usually used for injections.
- aqueous solvent for injection for example, distilled water, physiological saline solution, phosphate buffer solution, carbonic acid buffer solution, Tris buffer solution, buffer solution such as acetate buffer solution can be used.
- the pH of such an aqueous solvent is 5 to 10, preferably 6 to 8.
- the prepared injection solution is preferably filled in a suitable ampoule.
- the injection may be a lyophilized preparation.
- transdermal and mucosal absorption liquid sprays, ointments, gels, lotions, patches
- dosage forms for subcutaneous sustained release nanogels and biodegradable micro / nanocapsules, etc.
- Suspensions, temperature-responsive gels formulations containing transdermal devices for skin permeation (iontophoresis, microneedles), powders, tablets, capsules, syrups, inhalants such as aerosols and dry powders, etc. It can take the form.
- the pharmaceutical composition of the present invention is administered to humans or warm-blooded animals (mouse, rat, rabbit, sheep, pig, cow, horse, chicken, cat, dog, monkey, etc.) by both oral and parenteral routes. It is possible. Parenteral routes of administration include subcutaneous, intradermal and intramuscular injection, intraperitoneal administration, infusion, intravenous administration, administration to the oral mucosa, spraying to the nasal mucosa and pharynx, and the like.
- the dose of the polynucleotide-peptide conjugate that is the active ingredient of the pharmaceutical composition of the present invention includes activity, disease to be treated, type of animal to be administered, weight, sex, age, type of disease, administration method, etc. Depends on. Taking an adult weighing 60 kg as an example, in the case of oral administration, the daily dose is usually about 0.1 to about 100 mg, preferably about 1.0 to about 50 mg, and more preferably about 1.0 to about 20 mg. In the case of parenteral administration, the daily dose is usually about 0.01 to about 30 mg, preferably about 0.1 to about 20 mg, more preferably about 0.1 to about 10 mg. When administered to other animals, the dose obtained by converting the above dose into a dose per unit body weight and then multiplying by the body weight of the animal to be administered is used.
- the frequency of administration of the pharmaceutical composition of the present invention to a subject shall be easily determined by those skilled in the art in consideration of the type, weight, sex, age, type of disease, administration method, etc. of the animal to be administered. Can be done.
- the composition of the present invention when administered as a vaccine, it can be administered at intervals of 1 to several times / day, only one day or at intervals of 1 to several weeks, as in the case of ordinary vaccine preparations.
- the administration is preferably carried out while observing the course, and for example, booster immunization can be performed at intervals of at least about one week. By performing booster immunization, it is expected that a booster effect can be obtained, and a higher effect such as infection protection can be achieved.
- cytotoxic T cells CTL
- helper T cells are activated in an antigen-specific manner to induce a protective immune response in warm-blooded animals (preferably humans), whereby the infectious disease or cancer can be prevented or treated.
- administering the pharmaceutical composition of the present invention to a patient with an allergic disease it becomes an antigen-specific immunotherapy that suppresses an excessive immune response to an allergic antigen that causes the disease.
- the pharmaceutical composition of the present invention is useful as a vaccine for the prevention or treatment of the above-mentioned infectious diseases, cancers, allergic diseases and the like.
- infectious diseases cancers, allergic diseases and the like.
- tumors, malignant tumors, cancers, malignant neoplasms, carcinomas, sarcomas and the like may be collectively referred to as “tumors” or “cancers”.
- tumors and cancer also include pathological conditions classified into precancerous stages, such as bone marrow atypia syndrome.
- the type of tumor to be treated or prevented is not particularly limited as long as it is a tumor whose sensitivity to the pharmaceutical composition of the present invention is confirmed, but breast cancer, colon cancer, prostate cancer, lung cancer (small cell lung cancer, non-small cell lung cancer). , Etc.), gastric cancer, ovarian cancer, cervical cancer, endometrial cancer, uterine body cancer, renal cancer, hepatocellular carcinoma, thyroid cancer, esophageal cancer, osteosarcoma, skin cancer (including melanoma, etc.), collagen bud Examples include cell tumor, neuroblastoma, ovarian cancer, head and neck cancer, testicle tumor, colon cancer, hematological cancer (including leukemia, malignant lymphoma, multiple myeloma, etc.), retinoblastoma, pancreatic cancer and the like.
- the pharmaceutical composition of the present invention may be used in combination with other antitumor agents.
- antitumor antibiotics for example, antitumor antibiotics, antitumor plant components, BRM (Biological Response Modifier), hormones, vitamins, antitumor antibodies, molecular targeted drugs, alkylating agents, antimetabolites and others.
- BRM Bio Response Modifier
- hormones for example, antitumor antibiotics, antitumor plant components, BRM (Biological Response Modifier), hormones, vitamins, antitumor antibodies, molecular targeted drugs, alkylating agents, antimetabolites and others.
- examples include antitumor agents.
- antitumor antibiotics include, for example, mitomycin C, bleomycin, peplomycin, daunorubicin, acralubicin, doxorubicin, idarubicin, pyrarubicin, THP-adriamycin, 4'-epidoxorubicin or epirubicin, chromomycin A3 or actinomycin. D and the like can be mentioned.
- antitumor plant components and derivatives thereof include vinca alkaloids such as vindesine, vincristine or vinblastine, taxanes such as paclitaxel, docetaxel and cabazitaxel, and epipodophylrotoxins such as etoposide or teniposide. ..
- BRM examples include tumor necrosis factor and indomethacin.
- hormones include hydrocortisone, dexamethasone, methylprednisolone, prednisolone, plasterone, betamethasone, triamcinolone, oxymethasone, nandrolone, metenolone, fosfestrol, ethinyl estradiol, chlormadinone, mepethiostan or medroxyprogesterone.
- vitamins examples include vitamin C and vitamin A.
- Antitumor antibodies and molecular targeted drugs include trastuzumab, rituximab, cetuximab, panitumum, nimotsumab, denosumab, bebasizumab, infliximab, ipilimumab, nivolumab, penbrolizumab, avelumab, pizirizumab, avelumab, pizirizumab , Dubrafenib, trametinib, cobimetinib, pazopanib, parvosicrib, panobinostat, sorafenib, crizotinib, bemurafenib, cetuximab, bortezomib, calfilzomib, ixazomib, midstaurin, gilteritinib, etc.
- alkylating agent examples include alkylating agents such as nitrogen mustard, nitrogen mustard N-oxide, bendamustine or chlorambutyl, aziridine-based alkylating agents such as carbocon or thiotepa, and dibromomannitol or dibromodarsitol.
- alkylating agents such as nitrogen mustard, nitrogen mustard N-oxide, bendamustine or chlorambutyl, aziridine-based alkylating agents such as carbocon or thiotepa, and dibromomannitol or dibromodarsitol.
- alkylating agents such as nitrogen mustard, nitrogen mustard N-oxide, bendamustine or chlorambutyl, aziridine-based alkylating agents such as carbocon or thiotepa, and dibromomannitol or dibromodarsitol.
- alkylating agents such as nitrogen mustard, nitrogen mustard N-oxide, bendamustine or chlorambutyl,
- antimetabolite examples include purine antimetabolites such as 6-mercaptopurine, 6-thioguanine or thioinosin, and pyrimidine antimetabolites such as fluorouracil, tegafur, tegafur uracil, carmofur, doxifluidine, broxuridine, cytarabine or enocitabine. , Methotrexate or trimetrexate and other antimetabolites.
- antitumor agents include, for example, cisplatin, carboplatin, oxaliplatin, tamoxifen, retrozole, anastrosol, exemethan, tremiphen citrate, flubestrant, bicalutamide, ifosfamide, mitotane, leuprorelin, goseleline acetate.
- infectious diseases to be treated or prevented examples include infectious diseases caused by pathogens such as viruses, fungi, and bacteria.
- Viruses include influenza virus, hepatitis virus, human immunodeficiency virus (HIV), RS virus, ruin virus, measles virus, epidemic parotid adenitis virus, herpes virus, poliovirus, rotavirus, Japanese encephalitis virus, and varicella virus.
- Adenovirus mad dog disease virus, yellow fever virus and the like.
- bacterium examples include Bordetella pertussis, Clostridium tetani, Bordetella pertussis, Haemophilus influenzae, Tuberculosis, Streptococcus pneumoniae, Helicobacter pylori, Anthrax, Enteric typhoid, Meningococcus, Diarrhea, and Cholera.
- fungus examples include Candida fungus, Histplasma fungus, Cryptococcus fungus, Aspergillus fungus and the like.
- the pharmaceutical compositions of the present invention may be used in combination with existing therapeutic agents for these infectious diseases.
- allergic diseases to be treated or prevented include bronchial asthma, allergic rhinitis, atopic dermatitis, urticaria, food allergies, animal allergies, and anaphylaxis.
- the pharmaceutical composition of the present invention When the pharmaceutical composition of the present invention is administered in combination with an adjuvant or another drug, it means that the subject to be administered takes both drugs into the body for a certain period of time.
- a formulation in which both agents are contained in a single formulation may be administered, or each may be formulated separately and administered separately.
- the time of administration is not particularly limited, and they may be administered at the same time, at different times at different times, or on different days.
- the order of administration is not particularly limited. Since each preparation is usually administered according to each administration method, the administration may be the same number of times or different times.
- the administration method (administration route) of each preparation may be the same, or may be administered by a different administration method (administration route).
- both drugs do not have to be present in the body at the same time, and should be taken into the body for a certain period of time (for example, one month, preferably one week, more preferably several days, even more preferably one day). However, the other active ingredient may have disappeared from the body at the time of administration of either one.
- the present invention provides a method for treating or preventing a disease, which comprises administering a therapeutically or prophylactically effective amount of the pharmaceutical composition of the present invention to a subject in need thereof.
- Diseases include, for example, pathogen infections, tumors, and allergic diseases, preferably tumors.
- the "therapeutically or prophylactically effective amount” in the present invention means an amount that exerts a therapeutic or prophylactic effect for a specific disease or symptom, administration form and administration route, and means a target species, disease or symptom type, symptom, sex, etc. It will be determined according to age, chronic illness, and other factors.
- An immunoinducing agent containing a polynucleotide-peptide conjugate or a pharmaceutically acceptable salt thereof as an active ingredient covalently binds to a single-stranded polynucleotide or polynucleotide derivative containing a CpG motif, a peptide, and the polynucleotide or polynucleotide derivative on one end side and to the peptide on the other end side.
- Consists of spacers In the peptide, one or more consecutive amino acids at the N-terminal and / or C-terminal of the MHC-2 binding peptide are deleted, and an amino acid having a reactive functional group for forming a covalent bond with the spacer is used.
- the immunoinducing agent wherein the added peptide, wherein the one or more contiguous amino acids does not contain an anchor residue for MHC-2 binding.
- One or both of the covalent bond between the spacer and the polynucleotide or polynucleotide derivative and one or both of the covalent bond between the spacer and the peptide are covalent bonds that can be cleaved in the biological environment. B1].
- [B3] The immunoinducer according to [B1] or [B2], wherein the amino acid having a reactive functional group for forming a covalent bond with the spacer is an analog thereof having a cysteine or a thiol group.
- [B4] The immunoinducer according to any one of [B1] to [B3], wherein the covalent bond between the spacer and the peptide is a disulfide bond.
- [B5] The immunoinducer according to any one of [B1] to [B4], wherein the polynucleotide or polynucleotide derivative is a polydeoxyribonucleotide (DNA) or DNA derivative containing two or more CpG motifs.
- DNA polydeoxyribonucleotide
- [B6] The immunoinducer according to any one of [B1] to [B5], wherein the polynucleotide or polynucleotide derivative has a base length of 15 or more and 40 or less.
- [B7] The immunoinducing agent according to [B6], wherein the polynucleotide or polynucleotide derivative has a base length of 20 or more and 30 or less.
- [B8] The immunoinducer according to any one of [B1] to [B7], wherein the polynucleotide or polynucleotide derivative is a polynucleotide derivative in which at least a part of a phosphate diester bond is replaced with a phosphorothioate bond.
- [B13] The immune inducer according to any one of [B1] to [B10], wherein the spacer has a structure represented by any of the following formulas.
- [B14] The immunoinducible agent according to any one of [B1] to [B13], further comprising a substance having immunostimulatory activity as an adjuvant.
- [B15] A pharmaceutical composition containing the immunoinducing agent according to any one of [B1] to [B14].
- [B16] The pharmaceutical composition according to [B15], which is used for treating or preventing an infectious disease, a tumor, or an allergic disease.
- [B17] A method for treating or preventing an infectious disease, tumor, or allergic disease, which comprises administering to a patient the immunoinducing agent according to any one of [B1] to [B14].
- the peptide contained in the polynucleotide-peptide conjugate has one or more consecutive amino acids at the N-terminal and / or C-terminal of the MHC-2 binding peptide deleted, and is covalently bound to the spacer. It is a peptide to which an amino acid having a reactive functional group for forming is added.
- the number of amino acids deleted is not particularly limited as long as it does not include an anchor residue for MHC-2 binding, and is appropriately set according to the length of the original MHC-2 binding peptide and the position of the anchor residue. can do.
- An amino acid having a reactive functional group for forming a covalent bond with the spacer can be added to the N-terminal or C-terminal.
- the amino acid length of the peptide contained in the polynucleotide-peptide conjugate is not particularly limited, and may be, for example, 8 or more and 30 or less.
- immunoinducing agent in the present invention B include CpG30 (S) a2-OVA2-15 described in Example 9 below.
- a polynucleotide-peptide conjugate can be prepared using a shorter peptide, it is possible to provide a pharmaceutical composition having more excellent physical properties and / or economic efficiency.
- CpG DNA (S) indicates a DNA derivative (an example of a polynucleotide derivative) having a base sequence containing a CpG motif and having a phosphodiester bond replaced with a phosphorothioate bond.
- the polynucleotide derivative is represented by the one-letter base sequence notation and the left side is the 5'-terminal side (the right side is the 3'-terminal side), and the peptide is the single-letter notation and the left side is the N-terminal side (the right side is the C-terminal side).
- the terminal structure is up to the oxygen atom of the 5'or 3'hydroxyl group of the terminal nucleoside when bonded to the spacer.
- the CpG DNA (S) -peptide conjugate in this example is prepared as a salt to which triethylamine and acetic acid are added.
- Example 1 Preparation of CpG DNA (S) -peptide conjugate (1) Synthesis of CpG DNA (S) derivative The synthesis of CpG DNA (S) is performed by the phosphoramidite method (for example, Nucleic Acids Research, 12, 4539 (eg, Nucleic Acids Research, 12, 4539). 1984)) was used. Synthesis of CpG DNA (S) with amino group modification was performed using ssH Amino Linker (Bioorg. Med. Chem., 16, 941-949 (2008)). A contract synthesis service (GeneDesign, Inc.) was used for these synthesis. The nucleotide sequence of the synthesized CpG DNA (S) is shown below.
- CpG30a 5'-GAGCGTTCTACCATCGACTTCGAGCGTTCTC-3'(K3-30 (a) in Table 1; SEQ ID NO: 6) CpG20a: 5'-ATCGACTTCCGGAGCGTTCTC-3'(K3 in Table 1; SEQ ID NO: 1)
- the obtained amino group-modified CpG DNA (S) has a structure represented by the following formula at the 5'end.
- CpG30 (S) a those having the sequence of SEQ ID NO: 6 are referred to as "CpG30 (S) a”
- sequence of SEQ ID NO: 1 is referred to.
- amino group-modified CpG DNA (S) and succiimidyl 6- [3'-(2-pyridyldithio) -propionamide] hexanoate (LC-SPDP) were mixed in a phosphate buffer solution (pH 8. After mixing in 0) and allowing to stand at 40 ° C. for 3 hours, SPDP-modified CpG DNA (S) was purified using a NAP-5 column.
- the structure represented by the following formula is hereinafter referred to as "ssH aminolinker”.
- C-OVA8 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the 258th to 265th amino acid sequences of ovalbumin (OVA; GenBank accession number: CAA23716.1) (hereinafter, also referred to as OVA peptide 1).
- OVA peptide 1 ovalbumin
- C-TRP2-9 is a peptide consisting of the 180th to 188th amino acid sequences of mTRP2 (mouse Tyrosinase-related protein 2; GenBank accession number: CAA44951.1) known as a melanoma-related antigen (hereinafter, TRP2-9). Also referred to as), it is a peptide having cysteine added to the N-terminal.
- C-TRP2-8 is a peptide consisting of a sequence in which cysteine is added to the N-terminal of the 181st to 188th amino acid sequences of mTRP2.
- C-gp100-9 is a peptide consisting of the 25th to 33rd amino acid sequences of hGP100 (human glycoprotein 100; GenBank accession number: AAC60634.1) known as a melanoma-related antigen (hereinafter, also referred to as hGP100-9).
- hGP100-9 human glycoprotein 100; GenBank accession number: AAC60634.1
- C-gp100-8 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the 26th to 33rd amino acid sequences of hGP100.
- CM-TRP2-9 is a peptide in which cysteine and methionine are added to the N-terminal of a peptide consisting of the amino acid sequence of positions 180 to 188 of mTRP2.
- C-TRP2-13 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the 176th to 188th amino acid sequences of mTRP2.
- C-TRP2-11 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the 178th to 188th amino acid sequences of mTRP2.
- the detection was performed by monitoring the absorption at 260 nm. It was confirmed that the elution time of the CpG DNA (S) -peptide conjugate after fractionation was later than that of the SPDP-modified CpG DNA (S). It is considered that this is because the dissolution time was delayed by binding to the hydrophobic peptide. In addition, no peak of unreacted SPDP-modified CpG DNA (S) was observed in the chromatogram after fractionation, and a peak of only CpG DNA (S) -peptide conjugate was detected. Therefore, the target CpG DNA was detected.
- FIG. 1 shows a chromatogram of CpG30 (S) a-mTRP2pep9 (Compound 1) under the above condition (B).
- CpG DNA represents the base sequence portion of CpG30 (S) a or CpG20 (S) a
- “petide” refers to the portion of the peptide synthesized in (2) above excluding the N-terminal cysteine. show.
- the synthesized CpG DNA (S) -peptide conjugate is as follows.
- FIG. 2 shows the mass spectrum (MALDI-TOF) of CpG30 (S) a-mTRP2pep9 (Compound 1) as an example of the result of mass spectrometry. Peaks of 11248.28 (monovalent negative ion) and 5622.53 (divalent negative ion) were detected, and CpG30 (S) a-mTRP2pep9 (theoretical most abundant mass for C 369 H 480 N 116 O 174 P 30 S) 31 ) It was confirmed that a mass spectrum equivalent to 11246.56) was obtained.
- MALDI-TOF mass spectrum
- Example 2 Evaluation of cytotoxic T cell induction by CpG DNA (S) -peptide conjugate (evaluation using mTRP2 antigen) (1) Evaluation method for induction of cytotoxic T cells CpG DNA (S) -peptide conjugate was intradermally administered to mice (C57BL / 6 mice ( ⁇ , 7 weeks old)) as antigens. The dose of CpG DNA (S) -peptide conjugate was 50, 200 or 1000 ng in terms of peptide per fish (in this case, it is about 0.4, 1.7 or 8.5 ⁇ g in terms of CpG30 (S)).
- splenocytes were taken out from non-administered individuals of the same strain and divided into two groups of 2.0 ⁇ 10 7 cells / ml, one of which was 10 ⁇ g / ml of peptide as an antigen.
- Antigen-bearing splenocytes were prepared by adding the mixture so as to form mL and allowing it to stand for 90 minutes, and splenocytes to which no peptide was added were designated as antigen-non-retaining splenocytes.
- Both antigen-bearing and non-antigen-bearing splenocytes were fluorescently modified with 5,6-carboxyfluorescein succiimidyl ester (CFSE).
- the fluorescence intensity of the antigen-bearing splenocytes (CFSE: 1 ⁇ M) was made higher than that of the antigen-non-antigen-bearing splenocytes (CFSE: 0.1 ⁇ M).
- Equal numbers of administered antigen-carrying splenocytes and antigen-non-carrying splenocytes were mixed, and mice treated with CpG DNA (S) -peptide conjugate as an antigen were tailed with a cell count of 3.0 ⁇ 10 6 one week after administration. It was administered intravenously.
- mice Twenty-four hours after the above-mentioned tail vein administration, splenocytes were taken out from the mice, the ratio of antigen-carrying splenocytes to antigen-non-carrying splenocytes was quantified by flow cytometry, and the amount of decrease in antigen-carrying splenocytes was evaluated. , The activity of induced antigen-specific cytotoxic T cells was evaluated. For comparison, measurements were performed under similar conditions using individual mice to which PBS (phosphate buffered saline) was administered instead of CpG DNA (S) -peptide conjugate as a control group.
- PBS phosphate buffered saline
- CTL induction of CpG30 (S) a-OVApep9 using a peptide (OVA peptide 1) consisting of the 258 to 265th amino acid sequence of ovalbumin (OVA) known as an antigenic peptide was evaluated.
- OVA peptide 1 consisting of the 258 to 265th amino acid sequence of ovalbumin (OVA) known as an antigenic peptide.
- a peptide (TRP2-9) consisting of the 180th to 188th amino acid sequences (9 amino acids) of mTRP2 known as a melanoma-related antigen was used to use CpG30 (S) a-mTRP2pep10 (N-terminal of TRP2-9).
- CpG30 (S) amTRP2pep9 Evaluation of Cytotoxic T Cell Inducing Ability of CpG30 (S) amTRP2pep9
- the peptide portion is taken up by antigen-presenting cells and then the peptide portion is released. It needs to be detached from the polypeptide and spacer moieties and bound to the MHC molecule.
- C-TRP2-9 (10 amino acids) used for the preparation of CpG30 (S) amTRP2pep10 has 1 amino acid added to the N-terminal of the peptide having the original antigenicity, so that it is added to the MHC molecule.
- CpG DNA (S) -peptide conjugate CpG30 was used using a peptide (C-TRP2-8) to which cysteine was added after removing one residue (serine) at the N-terminal of TRP2-9 consisting of 9 amino acids.
- S amTRP2pep9 was prepared and the cytotoxic T cell-inducing ability was evaluated.
- TRP2-9 was used as an antigen for preparing antigen-carrying splenocytes. The measurement result of flow cytometry is shown in FIG.
- CpG30 (S) amTRP2pep9 a remarkable decrease in antigen-carrying splenocytes was observed at a dose of 200 ng in terms of peptide per fish, confirming that high CTL activity was induced.
- CpG30 (S) amTRP2pep10 almost no decrease in antigen-carrying splenocytes was observed.
- CpG30 (S) amTRP2pep9 was set to 50, 200 or 1000 ng in terms of peptide per fish, and the cytotoxic T cell-inducing ability was evaluated. TRP2-9 was used as an antigen for preparing antigen-carrying splenocytes. The measurement result of flow cytometry is shown in FIG. The CTL inducibility of CpG30 (S) amTRP2pep9 was dose-dependent. It has been shown that strong CTL activity can be induced at a dose of 200 ng.
- mTRP2pep9 was prepared and the cytotoxic T cell inducing ability was evaluated.
- TRP2-9 was used as an antigen for preparing antigen-carrying splenocytes.
- the measurement result of flow cytometry is shown in FIG. It was shown that CpG20 (S) amTRP2pep9 has a high CTL-inducing ability similar to CpG30 (S) amTRP2pep9.
- Example 3 Evaluation of MHC-1 binding property of the peptide used in the CpG-peptide conjugate of the present invention (evaluation of inhibition of MHC-1 binding competition with OVA peptide 1 in DC2.4 cells) After exfoliating the mouse dendritic cell line DC2.4 cells from the dish , suspend them in a 1.5 mL tube with 1.5 ⁇ 10 5 cells / 200 mL PBS so that OVA peptide 1 becomes 0.25 ⁇ g / mL. , And TRP2-derived peptides (TRP2-9, C-TRP2-9, or C-TRP2-8) were added to a peptide equivalent of 2.5 ⁇ g / mL, and the tubes were incubated on an ice bath for 30 minutes.
- TRP2-derived peptides TRP2-9, C-TRP2-9, or C-TRP2-8
- an antibody specific for the molecular complex of OVA peptide 1 and MHC-1 fluorescently labeled with phycoerythrin (PE): PE-labeled anti-mouse OVA 257-264 (SIINFEKL) peptide bound To H-2Kb antibody (ThermoFisher SCIENTIFIC)) (hereinafter referred to as "PE labeled H-2Kb / FINFE KL”) was added, and the OVA peptide 1-to which the antibody was bound on DC2.4 cells by flow cytometry.
- the MHC-1 complex was quantified and the MHC-1 binding competition inhibitory activity of the TRP2-derived peptide was evaluated.
- the measurement result of flow cytometry is shown in FIG.
- TRP2-9 When TRP2-9 is added, the average value of fluorescence intensity is reduced by 38%, and TRP2-9 has an inhibitory effect on the binding of OVA peptide 1 to MHC class I molecule, that is, it binds to MHC class I molecule. It was shown that it could. Also, when C-TRP2-8, which has the same amino acid length but different from TRP2-9 at the N-terminal, was added, the average value of fluorescence intensity decreased by 23%, and the OVA peptide 1 became an MHC class I molecule. The inhibitory effect on the binding of On the other hand, C-TRP2-9, which is one amino acid longer than TRP2-9, did not have an inhibitory effect. Therefore, it was suggested that C-TRP2-9 lost the binding property to MHC-1, and C-TRP2-8 maintained the binding property to MHC-1.
- Example 4 Evaluation of cytotoxic T cell induction by CpG DNA (S) -peptide conjugate (evaluation using hGP100) Using CpG30 (S) a-hGP100pep10 or CpG30 (S) a-hGP100pep9, the cytotoxic T cell-inducing ability was evaluated in the same manner as in Example 2.
- a peptide (hGP100-9) consisting of the 25th to 33rd amino acid sequences (9 amino acids) of hGP100, which is known as a melanoma-related antigen, was used.
- the measurement results of flow cytometry are shown in FIGS. 8 and 9.
- CpG30 (S) a-hGP100pep9 Similar to the case of evaluation using mTRP2, in CpG30 (S) a-hGP100pep9, a decrease in antigen-carrying splenocytes was observed at a dose of 200 ng in terms of peptide per fish, and it was confirmed that CTL activity was induced. On the other hand, in CpG30 (S) a-hGP100pep10, almost no decrease in antigen-carrying splenocytes was observed (FIG. 8). In addition, the CTL inducibility of CpG30 (S) a-hGP100pep9 was dose-dependent, indicating that a strong CTL activity can be induced at a dose of 200 ng (Fig. 9).
- CpG30 (S) amTRP2pep10 is also susceptible to trimming by ERAP by inserting alanine, leucine, or methionine on the C-terminal side of the N-terminal cysteine of C-TRP2-9. Therefore, it was considered that the CTL inducibility could be improved. Therefore, CpG DNA (S) -peptide conjugate CpG30 (S) a-CMTRP2-9 was prepared using CM-TRP2-9 in which methionine was inserted into the C-terminal side of the N-terminal cysteine of C-TRP2-9. Then, its CTL inducibility was evaluated. TRP2-9 was used as an antigen for preparing antigen-carrying splenocytes.
- FIG. 1 The measurement result of flow cytometry is shown in FIG. A sufficient decrease in antigen-carrying splenocytes was not observed even at a dose of 1000 ng in terms of peptide per fish, and there was almost no decrease at a dose of 200 ng.
- In vitro evaluation using a peptide (CM-TRP2-9) also showed that it was more likely to be cleaved by ERAP, but it was not possible to sufficiently improve the CTL inducibility in vivo. It was suggested.
- TRP2-9 was used as an antigen for preparing antigen-carrying splenocytes.
- the measurement result of flow cytometry is shown in FIG. No reduction in antigen-carrying splenocytes was observed with any of the CpG DNA (S) -peptide conjugates.
- S CpG DNA
- C-TRP2-11 or C-TRP2-13 suggested that ERAP was more likely to cleave, but in vivo evaluation using a conjugate showed CTL. It was suggested that the inducibility could not be sufficiently improved.
- Example 5 Synthesis of CpG DNA (S) -peptide conjugate containing a CpG motif other than the K3-derived CpG motif and evaluation of its cytotoxic T cell-inducing ability (1) Synthesis method By the same method as in Example 1. , A CpG DNA (S) -peptide conjugate containing a CpG motif other than the CpG motif derived from K3 was synthesized. The synthesized compounds are shown in the following formula and Table 3. C-TRP2-8 was used as the N-terminal modified peptide (see Example 1 (2)).
- Example 2 Test method The cytotoxic T cell-inducing ability of ISS1018-mTRP2pep9, ODN2006-mTRP2pep9, and ODN1826-mTRP2pep9 was evaluated by the same method as in Example 2. The dose was 200 ng in terms of peptide per fish. As a control, CpG30 (S) a-mTRP2pep9 (conjugate containing CpG motif derived from K3; see Example 1) was used. The results are shown in FIG. It was shown that all the compounds synthesized in (1) have the ability to induce cytotoxic T cells, similar to the conjugate containing the CpG motif derived from K3.
- Example 6 Synthesis of a conjugate having an ssH aminolinker moiety in which a phosphate group is replaced with a thiophosphate group and evaluation of its cytotoxic T cell-inducing ability
- a phosphate group is formed by the following method.
- a conjugate having an ssH aminolinker moiety substituted with a thiophosphate group was synthesized.
- the synthesized compounds are shown in the following formula and Table 4.
- the obtained amino group-modified CpG DNA (S) has a structure represented by the following formula at the 5'end.
- CpG30 (S) a2 those having the sequence of SEQ ID NO: 6 are referred to as "CpG30 (S) a2".
- SPDP-modified CpG DNA (S) has a structure represented by the following formula.
- C-OVA7 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the 259th to 265th amino acid sequences of ovalbumin (OVA; GenBank accession number: CAA23716.1).
- C-OVA7 is a peptide in which one residue at the N-terminal of OVA peptide 1 (peptide consisting of the amino acid sequence of SEQ ID NO: 41), which is an MHC-1 binding peptide, is deleted and cysteine is added to the N-terminal.
- C-TRP2-8 is as described in Example 1 and is a peptide in which one residue at the N-terminal of TRP2-9, which is an MHC-1 binding peptide, is deleted and cysteine is added to the N-terminal.
- Example 7 Evaluation of cytotoxic T cell induction by CpG DNA (S) -peptide conjugate (activity in two doses)
- the cytotoxic T cell-inducing ability when CpG30 (S) a-mTRP2pep9 was administered twice was evaluated by the same method as in Example 2.
- the second dose was given 10 days after the first dose.
- the dose was 200 ng in terms of peptide per fish.
- the results are shown in FIG. It was suggested that two doses of CpG DNA (S) -peptide conjugate improved CTL activity compared to a single dose.
- Example 8 Synthesis of double-stranded CpG DNA (S) -peptide conjugate CpG DNA (S) -peptide conjugate (CpG30 (S) a-mTRP2pep9; see Example 1) and its CpG DNA (S) portion
- a double-stranded complex double-stranded CpG DNA (S) -peptide conjugate
- S double-stranded CpG DNA
- S -peptide conjugate
- lipidated phosphoramidite represented by the following formula (synthesized by the same method as M22-12 phosphoramidite in the literature (WO2017 / 057540)) is used. This was done by using it for the final coupling of sequence synthesis of complementary strand DNA.
- the synthesis of complementary strand DNA having a lipid modification at the 3'-terminal was performed as follows. The first coupling was performed on a universal solid-phase carrier (Glen UniSupport 500 (GlenResearch, 20-5040)) with an Asymmetric Doubler (Lev) Phosphoramidite (GlenResearch, 10-1981), followed by the first coupling. Synthesized. Then, after detritylation and acetyl protection were performed on the solid phase carrier, the levulinic acid unit was deprotected by a method prescribed by the manufacturer. The target compound was synthesized by reacting the generated hydroxyl group with the above-mentioned lipidated phosphoramidite.
- Synthesis of complementary strand DNA with lipid modifications at the 3'and 5'-terminals was performed as follows. The first coupling was performed on a universal solid-phase carrier (Glen UniSupport 500 (GlenResearch, 20-5040)) with an Asymmetric Doubler (Lev) Phosphoramidite (GlenResearch, 10-1981), followed by the first coupling. Synthesized. Then, after detrityling on the solid phase carrier, the levulinic acid unit was deprotected by a method prescribed by the manufacturer. The target compound was synthesized by reacting the generated 3'and 5'-terminal hydroxyl groups with the above-mentioned lipidated phosphoramidite.
- the structure of the synthesized DNA derivative complementary to CpG is shown below.
- the DNA sequence (compK3: SEQ ID NO: 47) in the following derivative is a sequence complementary to the base sequence of K3 (SEQ ID NO: 1).
- 5'-Lipo-compK3 5'-Lipo ⁇ G ⁇ A ⁇ G ⁇ AACGCTCGAGA ⁇ G ⁇ T-3'
- 3'-Lipo-compK3 5'-G ⁇ A ⁇ G ⁇ AACGCTCGAGA ⁇ G ⁇ T ⁇ Lipo-3'
- 3'-di-Lipo-compK3 5'-Lipo ⁇ G ⁇ A ⁇ G ⁇ AACGCTCGAGA ⁇ G ⁇ T ⁇ Lipo-3'
- the double-stranded complex is formed by electrophoresis using polyacrylamide gel, liquid chromatography such as size exclusion chromatography, melting temperature measurement using ultraviolet spectroscopy, and aggregate molecular weight measurement by static light scattering method measurement. , Etc. can be confirmed.
- Example 9 Synthesis of CpG DNA (S) -peptide conjugate using MHC-2 binding peptide and evaluation of CD4 + T cell activation by it (1) Synthesis method Derived from MHC-2 binding peptide by the following method Two types of conjugates CpG30 (S) a2-OVA2-15 and CpG30 (S) a2-OVA2-17 having the CpG DNA (S) moiety of the above were synthesized. The synthesized compounds are shown in the following formula and Table 7.
- C-OVA2-14 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the amino acid sequences of 325 to 338 of ovalbumin (OVA; GenBank accession number: CAA23716.1).
- C-OVA2-14 deletes 1 N-terminal residue and 2 C-terminal residues of OVA peptide 2 (peptide consisting of the amino acid sequence of SEQ ID NO: 42 including mouse I-Ab / I-Ad binding sequence). It is a peptide having cysteine added to the N-terminal.
- C-OVA2-16 is a peptide in which cysteine is added to the N-terminal of the peptide consisting of the amino acid sequence of 325-340 of ovalbumin.
- C-OVA2-16 is a peptide in which one residue at the N-terminal of the OVA peptide 2 is deleted and cysteine is added to the N-terminal.
- CpG DNA (S) -peptide conjugate as an antigen was intradermally administered to mice (C57BL / 6 mice ( ⁇ , 7 weeks old)).
- the dose of CpG DNA (S) -peptide conjugate was 1000 ng in terms of peptide per fish.
- splenocytes were removed and seeded in 96 well dishes at 1.0 ⁇ 10 6 cells / 100 ⁇ L (medium; RPMI1640), and an OVA-derived MHC-2 binding antigen peptide (OVA 324-340 : ISQAVHAAHAEINEAGR) was used. (SEQ ID NO: 42)) was added so as to be 10 ⁇ g / mL.
- interferon gamma (IFN- ⁇ ) in the medium was quantified using the IFN gamma Mouse ELISA Kit (Invitrogen, IFN gamma'Femto-HS' High Sensitivity Mouse Uncoated ELISA Kit).
- mice When mice are immunized by administration of CpG DNA (S) -peptide conjugate, the stimulation by addition of the antigen peptide to the medium activates the antigen-specific CD4 + T cells in the splenocytes, and IFN- ⁇ To secrete.
- S CpG DNA
- FIGS. 15 and 17 High IFN- ⁇ secretory activity was observed in both mouse splenocytes to which CpG30 (S) a2-OVA2-15 and CpG30 (S) a2-OVA2-17 were administered (FIGS. 15 and 17; CpG30 (S)).
- CpG30 (S) For a2-OVA2-18, see Reference Example 3). It was shown that the C-terminal peptide may be deleted when the conjugate is prepared using the MHC-2 binding peptide.
- Reference Example 3 Synthesis of CpG DNA (S) -peptide conjugate using MHC-2 binding peptide and evaluation of CD4 + T cell activation by it (1) Synthesis method Derived from MHC-2 binding peptide by the following method Two types of conjugates CpG30 (S) a2-OVA2-18 and CpG30 (S) a2-OVA2-18c having the CpG DNA (S) moiety of the above were synthesized. The synthesized compounds are shown in the following formula and Table 8.
- C-OVA2-17 is a peptide in which cysteine is added to the N-terminal of a peptide consisting of the amino acid sequences of 324 to 340 of ovalbumin.
- C-OVA2-17 is a peptide in which cysteine is added to the N-terminal of the OVA peptide 2.
- OVA2-17-C is a peptide in which cysteine is added to the C-terminal of a peptide consisting of the amino acid sequences of 324 to 340 of ovalbumin.
- C-OVA2-17 is a peptide in which cysteine is added to the C-terminal of the OVA peptide 2.
- CpG DNA (S) -peptide conjugate as an antigen was intradermally administered to mice (C57BL / 6 mice ( ⁇ , 7 weeks old)).
- the dose of CpG DNA (S) -peptide conjugate was 1000 ng in terms of peptide per fish.
- splenocytes were removed and seeded in 96 well dishes at 1.0 ⁇ 10 6 cells / 100 ⁇ L (medium; RPMI1640), and an OVA-derived antigen peptide (OVA 324-340 : ISQAVHAAHAEINEAGR (SEQ ID NO: 42)).
- OVA 324-340 OVA-derived antigen peptide
- IFN- ⁇ interferon gamma in the medium was quantified using the IFN gamma Mouse ELISA Kit (Invitrogen, IFN gamma'Femto-HS' High Sensitivity Mouse Uncoated ELISA Kit).
- mice When mice are immunized by administration of CpG DNA (S) -peptide conjugate, the stimulation by addition of the antigen peptide to the medium activates the antigen-specific CD4 + T cells in the splenocytes, and IFN- ⁇ To secrete.
- S CpG DNA
- FIGS. 15 and 16 The results are shown in FIGS. 15 and 16. High IFN- ⁇ secretory activity was observed in mouse splenocytes treated with CpG30 (S) a2-OVA2-18 (FIGS. 15 and 16). In addition, activity equal to or higher than that when CpG30 (S) a2-OVA2-18 was administered was observed in the splenocytes of mice to which CpG30 (S) a2-OVA2-18c was administered (FIG. 16). It was shown that when a conjugate is prepared using an MHC-2 binding peptide, CpG DNA (S) may be conjugated to the C-terminal side.
- Example 10 Preparation of CpG DNA (S) -peptide conjugate (2) and evaluation of its cytotoxic T cell inducing ability
- Synthesis method (1-1) Synthesis of CpG DNA (S) derivative 5'end In the synthesis of CpG DNA (S) having a 6-mercaptohexyl group, after synthesizing the sequence of CpG DNA (S) using the phosphoramidite method, 5'-thiol-modifier C6 (S-Trityl-6-) This was done by reacting mercaptohexyl-1-[(2-cyanoethyl)-(N, N-diisopropyl)]-phosphoramidite). A contract synthesis service (GeneDesign, Inc.) was used for these synthesis.
- the obtained 6-mercaptohexyl-modified CpG DNA (S) has a structure represented by the following formula at the 5'end.
- CpG30 (S) a3 those having the sequence of SEQ ID NO: 6 are referred to as "CpG30 (S) a3".
- the CpG DNA (S) derivative having a structure represented by the following formula at the 5'end is synthesized with the amino group-modified CpG DNA (S) synthesized in (1-1) of Example 6 and PPC-.
- NHSester (2,5-Dioxopyrrolidin-1-yl3- (pyridin-2-yldisulfanyl) butanoate) was reacted at 1:30 molar ratio in phosphate buffer (pH 8.0) at 40 ° C. for 3 hours. After that, it was purified by NAP-5 column.
- the CpG DNA (S) -peptide conjugate was fractionated by HPLC purification to obtain CpG30 (S) a3-mTRP2pep9. Further, 5 mol equivalent of the peptide synthesized in (1-2) was mixed with the PPC-NHS ester-modified CpG DNA (S) synthesized in (1-1) in a 50% dimethyl sulfoxide (DMSO) aqueous solution. Then, the reaction was carried out at 40 ° C. for 2 hours. After the reaction, the CpG DNA (S) -peptide conjugate was fractionated by HPLC purification to obtain CpG30 (S) a2-MeS-mTRP2pep9.
- DMSO dimethyl sulfoxide
- CpG30 (S) a3-mTRP2pep9 The cytotoxic T cell-inducing ability of CpG30 (S) a3-mTRP2pep9 was evaluated by the same method as in Example 2. The dose was 200 ng in terms of peptide per fish. As a control, CpG30 (S) a2-mTRP2pep9 (conjugate containing CpG motif derived from K3; see Example 6) was used. The results are shown in FIG. It was shown that CpG30 (S) a3-mTRP2pep9 has the ability to induce cytotoxic T cells, similar to CpG30 (S) a2-mTRP2pep9, which has a different spacer structure.
- Example 11 Synthesis of CpG DNA (S) -peptide conjugate containing a cysteine analog (1) Synthesis method The same as in Example 1 using a peptide whose N-terminal is modified by a cysteine analog instead of cysteine. CpG DNA (S) -peptide conjugates were synthesized by the method. The synthesized compounds are shown in the following formula and Table 10. As the N-terminal modified peptide, the following synthetic peptide in which the N-terminal amino acid is an unnatural amino acid was used.
- dC-mTRP2pep8 D-cysteine-VYDFFVWL (SEQ ID NO: 52) homoC-mTRP2pep8: L-homocysteine-VYDFFVWL (SEQ ID NO: 53) Pen-mTRP2pep8: L-penicillamine-VYDFFVWL (SEQ ID NO: 54)
- CpG30 (S) a2-Pen-mTRP2pep8 was evaluated by the same method as in Example 2. The dose was 200 ng in terms of peptide per fish.
- CpG30 (S) a2-mTRP2pep9 conjuggate containing CpG motif derived from K3; see Example 6) was used. The results are shown in FIG. It was shown that CpG30 (S) a2-Pen-mTRP2pep8 containing a cysteine analog has a cytotoxic T cell-inducing ability similar to CpG30 (S) a2-mTRP2pep9.
- Example 12 Synthesis of CpG DNA (S) -peptide conjugate having peptides at both 5'and 3'ends of CpG DNA (1) Synthesis method The following methods (1-1) to (1-3) are used. Using, a CpG DNA (S) -peptide conjugate having peptides at both ends of the CpG DNA was synthesized. The synthesized compounds are shown in the following formula and Table 11. C-TRP2-8 was used as the N-terminal modified peptide (see Example 1 (2)).
- CpG30 (S) a4 examples having the sequence of SEQ ID NO: 6 are referred to as "CpG30 (S) a4".
- SPDP-modified CpG DNA (S) a4 was purified using a NAP-5 column.
- an immunoinducing agent capable of inducing CTL activity for a wide range of antigenic peptides, and a pharmaceutical composition containing the same.
- SEQ ID NO: 1 K3 SEQ ID NO: 2: K3-20 (b) SEQ ID NO: 3: K3-21 SEQ ID NO: 4: K3-24 SEQ ID NO: 5: K3-27 SEQ ID NO: 6: K3-30 (a) SEQ ID NO: 7: K3-30 (b) SEQ ID NO: 8: K3-40 SEQ ID NO: 9: K3-30 (c) SEQ ID NO: 10: K3-30 (d) SEQ ID NO: 11: K3-30 (e) SEQ ID NO: 12: K3-30 (f) SEQ ID NO: 13: K3-26 (a) SEQ ID NO: 14: K3-26 (b) SEQ ID NO: 15: ODN1668 SEQ ID NO: 16: ODN1668-30 SEQ ID NO: 17: ODN1668-40 SEQ ID NO: 18: ODN1826 SEQ ID NO: 19: ODN1826-30 SEQ ID NO: 20: ODN1826-40 SEQ ID NO: 21: ODN2006 SEQ ID NO: 22: ODN
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Abstract
Description
非特許文献4には、CpG DNAとオボアルブミン(OVA)抗原由来の18~24merのペプチドとのコンジュゲートにより、樹状細胞への取り込みおよび抗原提示が促進されたことが記載されている。
非特許文献5および6には、CpG DNAとOVA抗原タンパク質とのコンジュゲートにより、in vitroにおいてT細胞活性化が誘導されることが記載されている。また非特許文献5には、in vivoにおいて抗原特異的細胞傷害活性が誘導されたことが記載されている。
非特許文献7には、CpGオリゴヌクレオチドと腫瘍関連タンパク質または細胞とのコンジュゲートを作製する方法が記載されている。
特許文献1には、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と抗原性を有するペプチドとのコンジュゲートを有効成分として含む免疫誘導剤が開示されており、抗原特異的な高い免疫誘導活性を有することが示されている。
[1]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記免疫誘導剤。
[2]前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合である、[1]に記載の免疫誘導剤。
[3]前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体である、[1]または[2]に記載の免疫誘導剤。
[4]前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合である、[1]から[3]のいずれか一項に記載の免疫誘導剤。
[5]前記MHC結合ペプチドが、MHC-1結合ペプチドである、[1]から[4]のいずれか一項に記載の免疫誘導剤。
[6]前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドである、[5]に記載の免疫誘導剤。
[7]前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下である、[5]または[6]に記載の免疫誘導剤。
[8]前記MHC結合ペプチドが、MHC-2結合ペプチドである、[1]から[4]のいずれか一項に記載の免疫誘導剤。
[9]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体である、[1]~[8]のいずれか一項に記載の免疫誘導剤。
[10]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、15以上40以下である、[1]から[9]のいずれか一項に記載の免疫誘導剤。
[11]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下である、[10]に記載の免疫誘導剤。
[12]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、[1]から[11]のいずれか一項に記載の免疫誘導剤。
[13]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の50%以上がホスホロチオエート結合で置換されている、[12]に記載の免疫誘導剤。
[14]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されている、[13]に記載の免疫誘導剤。
[15]前記スペーサーが、下記の式で表される繰り返し単位を含む、[1]から[14]のいずれか一項に記載の免疫誘導剤。
Xは、酸素原子または硫黄原子を表し(ここで各Xは同じであっても異なっていてもよい)、
Rは、(CH2)pO、(CH2)qNHおよび(CH2CH2O)mのいずれかを表し(m、pおよびqは、それぞれ独立して10以下の自然数を表す。)、
nは、10以下の自然数を表す。
[16]前記スペーサーが、下記のいずれかの式で表される構造を有する、[1]から[15]のいずれか一項に記載の免疫誘導剤。
前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、
前記免疫誘導剤。
[19][1]に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体であり、
前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合であり、
前記MHC結合ペプチドが、MHC-1結合ペプチドであり、
前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドであり、
前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下であり、
前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されており、
前記スペーサーが、下記のいずれかの式で表される構造を有する、
前記免疫誘導剤。
[21][1]から[20]のいずれか一項に記載の免疫誘導剤を含む医薬組成物。
[22]感染症、腫瘍、またはアレルギー性疾患の治療または予防用である、[21]に記載の医薬組成物。
[23]腫瘍の治療または予防用である、[21]に記載の医薬組成物。
[24]患者に対して[1]から[20]のいずれか一項に記載の免疫誘導剤を投与することを含む、感染症、腫瘍、またはアレルギー性疾患の治療または予防方法。
[25]患者に対して[1]から[20]のいずれか一項に記載の免疫誘導剤を投与することを含む、腫瘍の治療または予防方法。
[26]感染症、腫瘍、またはアレルギー性疾患の治療または予防に使用するための[1]から[20]のいずれか一項に記載の免疫誘導剤。
[27]腫瘍の治療または予防に使用するための[1]から[20]のいずれか一項に記載の免疫誘導剤。
[28]感染症、腫瘍、またはアレルギー性疾患の治療または予防用医薬の製造のための、[1]から[20]のいずれか一項に記載の免疫誘導剤の使用。
[29]腫瘍の治療または予防用医薬の製造のための、[1]から[20]のいずれか一項に記載の免疫誘導剤の使用。
[30]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[31][30]に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[32][30]に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体であり、
前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合であり、
前記MHC結合ペプチドが、MHC-1結合ペプチドであり、
前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドであり、
前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下であり、
前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されており、
前記スペーサーが、下記のいずれかの式で表される構造を有する、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A1]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A2]前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合である、[A1]に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A3]前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体である、A1またはA2に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A4]前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合である、A1からA3のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A5]前記MHC結合ペプチドが、MHC-1結合ペプチドである、A1からA4のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A6]前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドである、A5に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A7]前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下である、A5またはA6に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A8]前記MHC結合ペプチドが、MHC-2結合ペプチドである、A1からA4のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A9]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体である、A1~A8のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A10]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、15以上40以下である、A1からA9のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A11]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下である、A10に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A12]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、A1からA11のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A13]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の50%以上がホスホロチオエート結合で置換されている、A12に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A14]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されている、A13に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A15]前記スペーサーが、下記の式で表される繰り返し単位を含む、A1からA14のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
Xは、酸素原子または硫黄原子を表し(ここで各Xは同じであっても異なっていてもよい)、
Rは、(CH2)pO、(CH2)qNHおよび(CH2CH2O)mのいずれかを表し(m、pおよびqは、それぞれ独立して10以下の自然数を表す。)、
nは、10以下の自然数を表す。
[A16]前記スペーサーが、下記のいずれかの式で表される構造を有する、A1からA15のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A19][A1]に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体であり、
前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合であり、
前記MHC結合ペプチドが、MHC-1結合ペプチドであり、
前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドであり、
前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下であり、
前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されており、
前記スペーサーが、下記のいずれかの式で表される構造を有する、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
[A20]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤の製造方法であって、
(1)CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体を調製すること、
(2)MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドを調製すること、ここで前記1または複数の連続するアミノ酸は、アンカー残基を含まない、および
(3)(1)のポリヌクレオチドまたはポリヌクレオチド誘導体と(2)のペプチドとをスペーサーを介して連結させること、ここで前記スペーサーは、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し、他端側で前記ペプチドと共有結合する、
を含む、方法。
[A21]免疫誘導剤が、[1]~[20]、[26]、および[27]のいずれか一項に記載の免疫誘導剤である、[A20]に記載の方法。
[A22]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩の製造方法であって、
(1)CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体を調製すること、
(2)MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドを調製すること、ここで前記1または複数の連続するアミノ酸は、アンカー残基を含まない、および
(3)(1)のポリヌクレオチドまたはポリヌクレオチド誘導体と(2)のペプチドとをスペーサーを介して連結させること、ここで前記スペーサーは、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し、他端側で前記ペプチドと共有結合する、
を含む、方法。
[A23]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩が、[A1]~[A19]のいずれか一項に記載のポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩である、[A22]に記載の方法。
[a1]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記免疫誘導剤。
[a2]前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合である、[a1]に記載の免疫誘導剤。
[a3]前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体である、[a1]または[a2]に記載の免疫誘導剤。
[a4]前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合である、[a1]から[a3]のいずれかに記載の免疫誘導剤。
[a5]前記MHC結合ペプチドが、MHC-1結合ペプチドである、[a1]から[a4]のいずれかに記載の免疫誘導剤。
[a6]前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドである、[a5]に記載の免疫誘導剤。
[a7]前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下である、[a5]または[a6]に記載の免疫誘導剤。
[a8]前記MHC結合ペプチドが、MHC-2結合ペプチドである、[a1]から[a4]のいずれかに記載の免疫誘導剤。
[a9]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体である、[a1]~[a8]のいずれかに記載の免疫誘導剤。
[a10]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、15以上40以下である、[a1]から[a9]のいずれかに記載の免疫誘導剤。
[a11]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下である、[a10]に記載の免疫誘導剤。
[a12]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、[a1]から[a11]のいずれかに記載の免疫誘導剤。
[a13]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の50%以上がホスホロチオエート結合で置換されている、[a12]に記載の免疫誘導剤。
[a14]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されている、[a13]に記載の免疫誘導剤。
[a15]前記スペーサーが、下記の式で表される繰り返し単位を含む、[a1]から[a14]のいずれかに記載の免疫誘導剤。
Xは、酸素原子または硫黄原子を表し(ここで各Xは同じであっても異なっていてもよい)、
Rは、(CH2)pO、(CH2)qNHおよび(CH2CH2O)mのいずれかを表し(m、pおよびqは、それぞれ独立して10以下の自然数を表す。)、
nは、10以下の自然数を表す。
[a16]前記スペーサーが、下記のいずれかの式で表される構造を有する、[a1]から[a15]のいずれかに記載の免疫誘導剤。
[a18][a1]から[a17]のいずれかに記載の免疫誘導剤を含む医薬組成物。
[a19]腫瘍治療用である、[a18]に記載の医薬組成物。
MHC-1結合ペプチドの具体例としては、OVAペプチド1(オボアルブミン(OVA;GenBankアクセッション番号:CAA23716.1)の258~265番目のアミノ酸配列からなるペプチド、SIINFEKL(配列番号41))、TRP2-9(mTRP2(GenBankアクセッション番号:CAA44951.1)の180~188番目のアミノ酸配列からなるペプチド)、hGP100-9(hGP100(GenBankアクセッション番号:AAC60634.1)の25~33番目のアミノ酸配列からなるペプチド)などが挙げられる。
MHC-2結合ペプチドの具体例としては、OVAペプチド2(OVAの324~340番目のアミノ酸配列からなるペプチド、ISQAVHAAHAEINEAGR(配列番号42))などが挙げられる。
アルキンとアジド化合物(アジ化物)は、下記に示すような付加環化反応(フイスゲン反応)により、1,2,3-トリアゾール環を形成する。両者は、生体分子を含む多くの有機化合物に導入可能な安定な官能基であり、水を含む溶媒中でも迅速かつほぼ定量的に反応し、殆ど副反応を伴わず、余分な廃棄物を生成しないため、いわゆる「クリックケミストリー」の中心的な反応として、生化学の分野で広く用いられている。アルキン誘導体およびアジド基は、任意の公知の方法を用いて、抗原性を有するペプチドまたはポリヌクレオチド若しくはポリヌクレオチド誘導体に導入することができる。アルキン誘導体としては、プロパルギルアルコール、プロパルギルアミン等の反応性官能基を有するものが容易に入手でき、これらをカルボキシル基やヒドロキシル基等の反応性官能基と直接反応させ、或いはカルボニルジイミダゾール等と共に反応させ、生成するアミド結合、エステル結合、ウレタン結合等を介してアルキン誘導体を導入することができる。アジド基についても、任意の公知の方法を用いて、抗原性を有するペプチドまたはポリヌクレオチド若しくはポリヌクレオチド誘導体に導入することができる。なお、フイスゲン反応は銅触媒の存在下で行われるが、抗原性を有するペプチドおよびリン酸ジエステル結合がホスホロチオエート結合等の含硫黄官能基で置換されたポリヌクレオチド誘導体には、銅イオンに配位する硫黄原子が存在するため、銅の触媒活性が低下するおそれがある。反応率を向上させるために過剰量の銅を添加することが好ましい。
電子求引性のカルボニル基またはスルホン基に隣接する二重結合を有するマレイミドまたはビニルスルホンは、中性付近のpHで、下記に示すように、チオール基との付加反応(マイケル付加反応)により、安定なチオエーテル誘導体を生成する。適当なスペーサーを有するマレイミドおよびビニルスルホン誘導体が市販されているため、抗原性を有するペプチドまたはポリヌクレオチド若しくはポリヌクレオチド誘導体にこれらの官能基を導入することは容易である。抗原性を有するペプチドにチオール基を導入する場合、システインを含む抗原性を有するペプチドの場合には、システイン残基側鎖のチオール基を利用できる。ただし、システインは、存在比が低いアミノ酸であるため、抗原性を有するペプチドのN末端側にシステインを導入したものを用いる。チオール基を含むポリヌクレオチドまたはポリヌクレオチド誘導体としては、これらの5'末端のヒドロキシル基をチオール基に変換したチオール化ポリヌクレオチドが用いられる。
上述のとおり、ペプチドのN末端に導入したチオール基と、チオール化ポリヌクレオチドのチオール基とを反応させ、ジスルフィド基を形成させる。ジスルフィド結合は、還元剤の存在下で切断されるため、上両者に比べ、安定性の点で劣るが、生体内の還元的環境下で切断されるという利点がある。ポリヌクレオチドまたはポリヌクレオチド誘導体へのチオール基の導入は、任意の公知の方法を用いて行うことができるが、具体例としては、下式に示すような、アミノ化ポリヌクレオチドまたはポリヌクレオチド誘導体と、ω-(2-ピリジルジチオ)脂肪酸のN-スクシイミジルエステルとの反応が挙げられる。
ポリヌクレオチドまたはポリヌクレオチド誘導体と2つ以上のペプチドとは、スペーサーを介して結合していればよい。ポリヌクレオチドまたはポリヌクレオチド誘導体は、例えば、それぞれ別々のスペーサーを介して2つ以上のペプチドと結合することができる。ポリヌクレオチドまたはポリヌクレオチド誘導体は、枝分かれした1つのスペーサーを介して2つ以上のペプチドと結合していてもよい。1つのポリヌクレオチドまたはポリヌクレオチド誘導体が、これらの結合様式の組み合わせにより、3つ以上のペプチドと結合していてもよい。ポリヌクレオチドまたはポリヌクレオチド誘導体部分がスペーサーと結合する位置は特に限定されず、例えば、5'末端および3’末端から選択され得る。
2つ以上のペプチドは、同じペプチドであっても異なるペプチドであってもよいが、全て同じであることが好ましい。1つのポリヌクレオチドまたはポリヌクレオチド誘導体に結合するペプチドの数は特に限定されず、例えば、2つ、3つ、4つ、5つ、またはそれ以上であり得る。
相補鎖ポリヌクレオチドまたはポリヌクレオチド誘導体は、本発明の免疫誘導剤におけるポリヌクレオチドまたはポリヌクレオチド誘導体部分と同様の方法により合成することができる。相補鎖ポリヌクレオチドまたはポリヌクレオチド誘導体は、生体内での安定性、毒性、体内動態等の特性の改善のために、修飾されていてもよい。そのような修飾としては、例えば、脂質修飾が挙げられる(WO2017/057540参照)。5’または3’末端の一方または両方に脂質修飾を有する化合物は、実施例8に記載の方法により合成することができる。
本発明の免疫誘導剤のポリヌクレオチドまたはポリヌクレオチド誘導体部分と相補鎖ポリヌクレオチドまたはポリヌクレオチド誘導体との二本鎖形成は、一般的なアニーリングの方法に従って行うことができる。例えば、ポリヌクレオチド-ペプチドコンジュゲートと相補鎖ポリヌクレオチドまたはポリヌクレオチド誘導体とを混合し、一本鎖状態となるように加温したのち、室温まで自然冷却させることにより、二本鎖を形成させることができる。
(1)CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体を調製すること、
(2)MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドを調製すること、ここで前記1または複数の連続するアミノ酸は、アンカー残基を含まない、および
(3)(1)のポリヌクレオチドまたはポリヌクレオチド誘導体と(2)のペプチドとをスペーサーを介して連結させること、ここで前記スペーサーは、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し、他端側で前記ペプチドと共有結合する、
を含む方法により、製造され得る。したがって、一態様において、本発明は、上記工程(1)~(3)を含む、本発明の免疫誘導剤の製造方法を提供する。本態様における各用語は、本明細書中に記載された用語の説明に基づいて解釈される。本方法により、広範な抗原ペプチドを用いて、CTL活性の誘導が可能な免疫誘導剤を製造することができる。
また当該ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩は、上記本発明の免疫誘導剤の製造方法における工程(1)~(3)を含む方法により製造され得る。したがって、一態様において、本発明は、上記工程(1)~(3)を含む、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩の製造方法を提供する。本態様における各用語は、本明細書中に記載された用語の説明に基づいて解釈される。本方法により、広範な抗原ペプチドを用いて、CTL活性の誘導が可能な免疫誘導剤の有効成分となり得るポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を製造することができる。
[B1]ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC-2結合ペプチドのN末端および/またはC末端の1または複数の連続するアミノ酸が削除されており、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸が付加されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC-2結合のためのアンカー残基を含まない、前記免疫誘導剤。
[B2]前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合である、[B1]に記載の免疫誘導剤。
[B3]前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体である、[B1]または[B2]に記載の免疫誘導剤。
[B4]前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合である、[B1]から[B3]のいずれかに記載の免疫誘導剤。
[B5]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体である、[B1]から[B4]のいずれかに記載の免疫誘導剤。
[B6]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、15以上40以下である、[B1]から[B5]のいずれかに記載の免疫誘導剤。
[B7]前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下である、[B6]に記載の免疫誘導剤。
[B8]前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、[B1]から[B7]のいずれかに記載の免疫誘導剤。
[B9]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の50%以上がホスホロチオエート結合で置換されている、[B8]に記載の免疫誘導剤。
[B10]前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されている、[B9]に記載の免疫誘導剤。
[B11]前記スペーサーが、下記の式で表される繰り返し単位を含む、[B1]から[B10]のいずれかに記載の免疫誘導剤。
Xは、酸素原子または硫黄原子を表し(ここで各Xは同じであっても異なっていてもよい)、
Rは、(CH2)pO、(CH2)qNHおよび(CH2CH2O)mのいずれかを表し(m、pおよびqは、それぞれ独立して10以下の自然数を表す。)、
nは、10以下の自然数を表す。
[B12]前記スペーサーが、下記のいずれかの式で表される構造を有する、[B1]から[B11]のいずれかに記載の免疫誘導剤。
前記スペーサーが、下記のいずれかの式で表される構造を有する、[B1]から[B10]のいずれかに記載の免疫誘導剤。
[B15][B1]から[B14]のいずれかに記載の免疫誘導剤を含む医薬組成物。
[B16]感染症、腫瘍、またはアレルギー性疾患の治療または予防用である、[B15]に記載の医薬組成物。
[B17]患者に対して[B1]から[B14]のいずれかに記載の免疫誘導剤を投与することを含む、感染症、腫瘍、またはアレルギー性疾患の治療または予防方法。
[B18]感染症、腫瘍、またはアレルギー性疾患の治療または予防に使用するための[B1]から[B14]のいずれかに記載の免疫誘導剤。
[B19]感染症、腫瘍、またはアレルギー性疾患の治療または予防用医薬組成物の製造のための、[B1]から[B14]のいずれかに記載の免疫誘導剤の使用。
(1)CpG DNA(S)誘導体の合成
CpG DNA(S)の合成は、ホスホロアミダイト法(例えば、Nucleic Acids Research, 12, 4539 (1984))を用いて行った。アミノ基修飾を持つCpG DNA(S)の合成は、ssH Amino Linker (Bioorg. Med. Chem., 16, 941-949 (2008))を用いて行った。これらの合成には、受託合成サービス(株式会社ジーンデザイン)を利用した。
合成したCpG DNA(S)の塩基配列を以下に示す。
CpG30a:5’-GAGCGTTCTCATCGACTCTCGAGCGTTCTC-3’(表1のK3-30(a);配列番号6)
CpG20a:5’-ATCGACTCTCGAGCGTTCTC-3’(表1のK3;配列番号1)
なお、下記の式で表される構造を、以下「ssHアミノリンカー」と称する。
ペプチドは、受託合成サービス(株式会社ジーンデザイン)を利用して合成した。
合成したペプチドのアミノ酸配列を以下に示す。
C-OVA8:CSIINFEKL(配列番号30)
C-TRP2-9:CSVYDFFVWL(配列番号31)
C-TRP2-8:CVYDFFVWL(配列番号32)
C-gp100-9:CKVPRNQDWL(配列番号33)
C-gp100-8:CVPRNQDWL(配列番号34)
CM-TRP2-9:CMSVYDFFVWL(配列番号35)
C-TRP2-13:CFANASVYDFFVWL(配列番号36)
C-TRP2-11:CNASVYDFFVWL(配列番号37)
C-TRP2-9は、メラノーマ関連抗原として知られているmTRP2(mouse Tyrosinase-related protein 2;GenBankアクセッション番号:CAA44951.1)の180~188番目のアミノ酸配列からなるペプチド(以下、TRP2-9ともいう。)のN末端にシステインを付加したペプチドである。
C-TRP2-8は、mTRP2の181~188番目のアミノ酸配列のN末端にシステインを付加した配列からなるペプチドである。
C-gp100-9は、メラノーマ関連抗原として知られているhGP100(human glycoprotein 100;GenBankアクセッション番号:AAC60634.1)の25~33番目のアミノ酸配列からなるペプチド(以下、hGP100-9ともいう。)のN末端にシステインを付加したペプチドである。
C-gp100-8は、hGP100の26~33番目のアミノ酸配列からなるペプチドのN末端にシステインを付加したペプチドである。
CM-TRP2-9は、mTRP2の180~188番目のアミノ酸配列からなるペプチドのN末端にシステインおよびメチオニンを付加したペプチドである。
C-TRP2-13は、mTRP2の176~188番目のアミノ酸配列からなるペプチドのN末端にシステインを付加したペプチドである。
C-TRP2-11は、mTRP2の178~188番目のアミノ酸配列からなるペプチドのN末端にシステインを付加したペプチドである。
(1)で合成したSPDP修飾CpG DNA(S)1molと、(2)で合成したペプチド25molとを、30%N,N-ジメチルホルムアミド(DMF)水溶液中で混合し、40℃で3時間静置した後、下記(A)~(C)のいずれかの条件によるHPLCでCpG DNA(S)-ペプチドコンジュゲートを分取した。各コンジュゲートの分取に使用したHPLC条件および保持時間を表2に示す。
<HPLC条件(A)>
以下のグラジェント条件で、A液を0.1Mヘキサフルオロイソプロパノール、8mMトリエチルアミン(TEA)、B液をメタノールとし、カラムはX-Bridge C18 2.5μm 4.6*75mm(Waters Corporation)を用い、カラム温度60℃、流速1mL/分で、HPLCを行った。
0分 A:95% B: 5%
~20分 A:70% B: 30%
<HPLC条件(B)>
以下のグラジェント条件で、A液を0.1Mヘキサフルオロイソプロパノール、8mMトリエチルアミン(TEA)、B液をメタノールとし、カラムはX-Bridge C18 2.5μm 4.6*75mm(Waters Corporation)を用い、カラム温度60℃、流速1mL/分で、HPLCを行った。
0分 A:95% B: 5%
~25分 A:60% B: 40%
<HPLC条件(C)>
以下のグラジェント条件で、A液を0.1M酢酸トリエチルアンモニウム(TEAA;pH 7.0)、B液をアセトニトリルとし、カラムはZORBAX Eclipse Plus C18(Agilent Technologies)を用い、カラム温度40℃、流速1mL/分で、HPLCを行った。
0分 A:90% B: 10%
~25分 A:70% B: 30%
~30分 A: 0% B:100%
<HPLC条件(D)>
以下のグラジェント条件で、A液を0.1Mヘキサフルオロイソプロパノール、8mMトリエチルアミン(TEA)、B液をメタノールとし、カラムはX-Bridge C18 2.5μm 4.6*75mm(Waters Corporation)を用い、カラム温度60℃、流速1mL/分で、HPLCを行った。
0分 A:95% B: 5%
~25分 A:50% B: 50%
(1)細胞傷害性T細胞誘導の評価方法
抗原としてCpG DNA(S)-ペプチドコンジュゲートを、マウス(C57BL/6マウス(♂、7週齢))に皮内投与した。CpG DNA(S)-ペプチドコンジュゲートの投与量は、1尾あたりペプチド換算で50、200または1000 ngとした(この場合、CpG30(S)換算では約0.4、1.7または8.5μgである)。投与から1週間後、同系統のマウスのうち、投与を行っていない個体より脾細胞を取り出し、これを2.0×107 cells/mlずつ2つの群に分け、一方に、抗原としてペプチドを10μg/mLになるように添加し、90分静置することにより抗原保持脾細胞を作製し、ペプチドを添加していない脾細胞を抗原未保持脾細胞とした。5,6-カルボキシフルオレセインスクシイミジルエステル(CFSE)を用いて、抗原保持脾細胞および抗原未保持脾細胞の両者を蛍光修飾した。このとき、CFSEの濃度を変えることにより、抗原保持脾細胞(CFSE:1μM)の方が、抗原未保持脾細胞(CFSE: 0.1μM)よりも蛍光強度が高くなるようにした。投与抗原保持脾細胞、抗原未保持脾細胞をそれぞれ同数混合し、抗原としてCpG DNA(S)-ペプチドコンジュゲートを投与したマウス個体に、投与から1週間後に3.0×106の細胞数にて尾静脈投与した。
上記の尾静脈投与から24時間経過後に、マウスから脾細胞を取り出し、抗原保持脾細胞と抗原未保持脾細胞の割合をフローサイトメトリーで定量し、抗原保持脾細胞の減少量を評価することにより、誘導された抗原特異的細胞傷害性T細胞の活性を評価した。比較のために、対照群として、CpG DNA(S)-ペプチドコンジュゲートの代わりにPBS(リン酸緩衝生理食塩水)を投与したマウス個体を用いて同様の条件で測定を行った。
先願(PCT/JP2019/038090)においては、OVA由来の抗原性を有するペプチドを用いた試験により、CpG DNA(S)-ペプチドコンジュゲートが高い細胞傷害性T細胞(CTL)誘導能を有することを示した。その一方、他の抗原ペプチドについて同様のCpG DNA(S)-ペプチドコンジュゲートを作製した場合、十分なCTL誘導能が得られない場合があることが判明した(図3)。
具体的には、抗原性を有するペプチドとして知られているオボアルブミン(OVA)の258~265番目のアミノ酸配列からなるペプチド(OVAペプチド1)を用いて、CpG30(S)a-OVApep9のCTL誘導能を評価したところ、1尾あたりペプチド換算で20ngの投与量で抗原保持脾細胞の消失が観察され、強いCTL活性が誘導されたことが確認された。それに対し、メラノーマ関連抗原として知られているmTRP2の180~188番目のアミノ酸配列(9アミノ酸)からなるペプチド(TRP2-9)を用いて、CpG30(S)a-mTRP2pep10(TRP2-9のN末端にシステインを付加したペプチドを用いて調製したコンジュゲート)のCTL誘導能を評価したところ、1尾あたりペプチド換算で200ngの投与量でもCTL活性は見られなかった。
CpG DNA(S)-ペプチドコンジュゲートがCTL活性を誘導するためには、抗原提示細胞に取り込まれたのち、ペプチド部分がポリヌクレオチド部分およびスペーサー部分から外れ、MHC分子に結合する必要がある。上記結果から、CpG30(S)a-mTRP2pep10の調製に用いたC-TRP2-9(10アミノ酸)は、本来の抗原性を有するペプチドのN末端に1アミノ酸が付加されているため、MHC分子に結合できないか、もしくは結合してもT細胞受容体に認識されない可能性が考えられた。
そこで、9アミノ酸からなるTRP2-9のN末端の1残基(セリン)を削った上でシステインを付加したペプチド(C-TRP2-8)を用いて、CpG DNA(S)-ペプチドコンジュゲートCpG30(S)a-mTRP2pep9を調製し、細胞傷害性T細胞誘導能を評価した。抗原保持脾細胞を調製するための抗原としてTRP2-9を用いた。
フローサイトメトリーの測定結果を図4に示す。CpG30(S)a-mTRP2pep9では、1尾あたりペプチド換算で200ngの投与量で抗原保持脾細胞の顕著な減少が観察され、高いCTL活性が誘導されたことが確認された。それに対してCpG30(S)a-mTRP2pep10では、抗原保持脾細胞の減少はほとんど観察されなかった。
CpG30(S)a-mTRP2pep9の投与量を1尾あたりペプチド換算で50、200または1000 ngとして、細胞傷害性T細胞誘導能を評価した。抗原保持脾細胞を調製するための抗原としてTRP2-9を用いた。
フローサイトメトリーの測定結果を図5に示す。CpG30(S)a-mTRP2pep9のCTL誘導能には用量依存性が認められた。200 ngの用量で強いCTL活性の誘導が可能であることが示された。
CpG30(S)a-mTRP2pep9のポリヌクレオチド部分を、20塩基長のCpG20(S)aに置換したCpG DNA(S)-ペプチドコンジュゲートCpG20(S)a-mTRP2pep9を調製し、細胞傷害性T細胞誘導能を評価した。抗原保持脾細胞を調製するための抗原としてTRP2-9を用いた。
フローサイトメトリーの測定結果を図6に示す。CpG20(S)a-mTRP2pep9は、CpG30(S)a-mTRP2pep9と同様に高いCTL誘導能を有することが示された。
マウス樹状細胞株DC2.4細胞をディッシュより剥離後、1.5mLチューブに1.5×105cells/200mL PBSで懸濁させ、そこにOVAペプチド1を0.25μg/mLになるように、またTRP2由来のペプチド(TRP2-9、C-TRP2-9、またはC-TRP2-8)をペプチド換算2.5μg/mLになるように添加し、チューブを氷浴上で30分間インキュベートした。次に、OVAペプチド1とMHC-1との分子複合体に特異的な抗体(フィコエリスリン(PE)で蛍光標識:PE-labeled anti-mouse OVA257-264 (SIINFEKL) peptide bound
to H-2Kb antibody (ThermoFisher SCIENTIFIC))(以下、「PE labelled H-2Kb/FIINFEKL」と称する。)を添加し、フローサイトメトリーで、DC2.4細胞上の前記抗体が結合したOVAペプチド1-MHC-1複合体を定量し、TRP2由来のペプチドによるMHC-1結合競合阻害活性を評価した。
フローサイトメトリーの測定結果を図7に示す。TRP2-9を添加した場合、蛍光強度の平均値が38%低下し、TRP2-9がOVAペプチド1のMHCクラスI分子への結合に対して阻害効果を有すること、すなわちMHCクラスI分子に結合し得ることが示された。また、TRP2-9とN末端のアミノ酸は異なるが同じアミノ酸長であるC-TRP2-8を添加した場合にも、蛍光強度の平均値が23%低下し、OVAペプチド1のMHCクラスI分子への結合に対する阻害効果が確認された。一方、TRP2-9よりも1アミノ酸長いC-TRP2-9では、阻害効果はみられなかった。
したがって、C-TRP2-9ではMHC-1への結合性が失われ、C-TRP2-8ではMHC-1への結合性が維持されることが示唆された。
CpG30(S)a-hGP100pep10またはCpG30(S)a-hGP100pep9を用いて、実施例2と同様に細胞傷害性T細胞誘導能を評価した。抗原保持脾細胞を調製するための抗原として、メラノーマ関連抗原として知られているhGP100の25~33番目のアミノ酸配列(9アミノ酸)からなるペプチド(hGP100-9)を用いた。
フローサイトメトリーの測定結果を図8および9に示す。mTRP2を用いて評価した場合と同様、CpG30(S)a-hGP100pep9では、1尾あたりペプチド換算で200ngの投与量で抗原保持脾細胞の減少が観察され、CTL活性が誘導されたことが確認されたのに対して、CpG30(S)a-hGP100pep10では、抗原保持脾細胞の減少はほとんど観察されなかった(図8)。またCpG30(S)a-hGP100pep9のCTL誘導能には用量依存性が認められ、200 ngの用量で強いCTL活性の誘導が可能であることが示された(図9)。
MHC-1による抗原ペプチドの提示には、小胞体アミノペプチダーゼ(ERAP)が関与する。抗原ペプチド前駆体は、ERAPによるN末端からのトリミングを受けてMHC-1への結合に適した長さとなる。このプロセスに関し、N末端にシステインを有する抗原ペプチド前駆体において、システインのC末端側にアラニン、ロイシン、またはメチオニンを挿入すると、ERAPによるトリミングを受けやすくなることが報告されている(WO2014/157704)。図3に示した結果から、CpG30(S)a-mTRP2pep10についても、C-TRP2-9のN末端のシステインのC末端側にアラニン、ロイシン、またはメチオニンを挿入することによりERAPによるトリミングを受けやすくなり、CTL誘導能が改善される可能性が考えられた。
そこで、C-TRP2-9のN末端のシステインのC末端側にメチオニンを挿入したCM-TRP2-9を用いて、CpG DNA(S)-ペプチドコンジュゲートCpG30(S)a-CMTRP2-9を調製し、そのCTL誘導能を評価した。抗原保持脾細胞を調製するための抗原としてTRP2-9を用いた。
フローサイトメトリーの測定結果を図10に示す。1尾あたりペプチド換算で1000ngの投与量でも十分な抗原保持脾細胞の減少は観察されず、200ngの投与量ではほとんど減少しなかった。ペプチド(CM-TRP2-9)を用いたin vitro評価ではERAPにより切断されやすくなったことが示唆される結果も得られたが、in vivoではCTL誘導能を十分に向上させることはできないことが示唆された。
ERAPによるトリミングの受けやすさは、ペプチドの鎖長によって変わり、9~16アミノ酸長のペプチドがERAPの好ましい基質であることが報告されている(Proc Natl Acad Sci U S A. 102(47):17107-12 (2005))。
そこで、C-TRP2-9におけるTRP2由来の配列よりもN末端側がさらに2または4アミノ酸長い配列C-TRP2-11およびC-TRP2-13を用いて、CpG DNA(S)-ペプチドコンジュゲートCpG30(S)a-TRP2-12およびCpG30(S)a-TRP2-14を調製し、それらのCTL誘導能を評価した。抗原保持脾細胞を調製するための抗原としてTRP2-9を用いた。
フローサイトメトリーの測定結果を図11に示す。いずれのCpG DNA(S)-ペプチドコンジュゲートも、抗原保持脾細胞の減少は観察されなかった。ペプチド(C-TRP2-11またはC-TRP2-13)を用いたin vitro評価ではERAPにより切断されやすくなったことが示唆される結果も得られたが、コンジュゲートを用いたin vivo評価ではCTL誘導能を十分に向上させることができないことが示唆された。
(1)合成法
実施例1と同様の方法により、K3由来のCpGモチーフ以外のCpGモチーフを含むCpG DNA(S)-ペプチドコンジュゲートを合成した。合成した化合物を下記式および表3に示す。なお、N末端修飾ペプチドとして、C-TRP2-8を用いた(実施例1(2)参照)。
実施例2と同様の方法により、ISS1018-mTRP2pep9、ODN2006-mTRP2pep9、およびODN1826-mTRP2pep9による細胞傷害性T細胞誘導能を評価した。投与量は、1尾あたりペプチド換算で200 ngとした。対照として、CpG30(S)a-mTRP2pep9(K3由来のCpGモチーフを含むコンジュゲート;実施例1参照)を用いた。
結果を図12に示す。(1)で合成したいずれの化合物も、K3由来のCpGモチーフを含むコンジュゲートと同様に、細胞傷害性T細胞誘導能を有することが示された。
(1)合成法
以下の方法により、リン酸基がチオリン酸基に置換されたssHアミノリンカー部分を有するコンジュゲートを合成した。合成した化合物を下記式および表4に示す。
CpG DNA(S)の合成は、ホスホロアミダイト法(例えば、Nucleic Acids Research, 12, 4539 (1984))を用いて行った。アミノ基修飾を持つCpG DNA(S)の合成は、ssH Amino Linker (Bioorg. Med. Chem., 16, 941-949 (2008))のリン酸基がチオリン酸基に置換されたものを用いて行った。これらの合成には、受託合成サービス(株式会社ジーンデザイン)を利用した。
合成したCpG DNA(S)の塩基配列は、実施例1(1)に記載のCpG30aと同じである。
得られたアミノ基修飾CpG DNA(S)は、5’末端に下記の式で表される構造を有する。以下、5’末端に下記の式で表される構造を有するCpG DNA(S)誘導体のうち、配列番号6の配列を有するものを「CpG30(S)a2」と称する。
なお、得られたSPDP修飾CpG DNA(S)は、下記の式で表される構造を有する。
ペプチドは、受託合成サービス(株式会社ジーンデザイン)を利用して合成した。
合成したペプチドのアミノ酸配列を以下に示す。
C-OVA7:CIINFEKL(配列番号46)
C-TRP2-8:CVYDFFVWL(配列番号32)
C-TRP2-8は、実施例1に記載したとおりであり、MHC-1結合ペプチドであるTRP2-9のN末端1残基を削除し、N末端にシステインを付加したペプチドである。
(1-1)で合成したSPDP修飾CpG DNA(S)に対して、(1-2)で合成したペプチドを5乃至10モル等量、50%ジメチルスルホキシド(DMSO)水溶液中で混合し、40℃で2時間反応させた。反応後、下記の条件によるHPLC精製でCpG DNA(S)-ペプチドコンジュゲートを分取した。
<HPLC条件(E)>
以下のグラジェント条件で、A液を0.1Mヘキサフルオロイソプロパノール(HFIP)、8mMトリエチルアミン(TEA)、B液をメタノールとし、カラムはXBridge BEH C18 (4.6×75 mm Column XP)(Waters Corporation)を用い、カラム温度40℃、流速1mL/分で、HPLCを行った。
0分 A:80% B: 20%
~10分 A:50% B: 50%
各コンジュゲートの分取に使用したHPLC条件および保持時間を表4に示す。
実施例2と同様の方法により、CpG30(S)a2-OVApep8およびCpG30(S)a2-mTRP2pep9の細胞傷害性T細胞誘導能を評価した。CpG30(S)a2-OVApep8の投与量は1尾あたりペプチド換算で20 ngとした。CpG30(S)a2-mTRP2pep9の投与量は1尾あたりペプチド換算で200 ngとした。2つのコンジュゲートの間の投与量の違いは、元々のペプチド自体の抗原性の強さの違いを反映している。
結果を図13に示す。(1)で合成したCpG30(S)a2-OVApep8およびCpG30(S)a2-mTRP2pep9のいずれも、高い細胞傷害性T細胞誘導能を有することが示された。
CpG30(S)a-mTRP2pep9を2回投与した場合の細胞傷害性T細胞誘導能を、実施例2と同様の方法により評価した。2回目の投与は、1回目の投与の10日後に行った。投与量は、いずれも1尾あたりペプチド換算で200 ngとした。
結果を図14に示す。CpG DNA(S)-ペプチドコンジュゲートを2回投与することにより、単回投与の場合よりもCTL活性が向上することが示唆された。
CpG DNA(S)-ペプチドコンジュゲート(CpG30(S)a-mTRP2pep9;実施例1参照)と、そのCpG DNA(S)部分の塩基配列に相補的な配列を有するDNA誘導体とをアニーリングさせることにより、二本鎖複合体(二本鎖CpG DNA(S)-ペプチドコンジュゲート)を調製した。
(1)CpG相補鎖DNA誘導体の合成
CpGに相補的なDNAの合成は、CpG DNA(S)と同様にホスホロアミダイト法を用いて行った。5'末端に脂質修飾を持つ相補鎖DNAの合成は、下記の式で表される脂質化ホスホロアミダイト(文献(WO2017/057540)中のM22-12ホスホロアミダイトと同様の方法により合成)を相補鎖DNAの配列合成の最後のカップリングに用いることで行った。
ユニバーサル固相担体(Glen UnySupport 500 (GlenResearch, 20-5040))上で、Asymmetric Doubler(Lev) Phosphoramidite (GlenResearch, 10-1981)を用いて最初のカップリングを行った後に、相補鎖DNAの配列を合成した。次いで、固相担体上で脱トリチル化およびアセチル保護を行った後に、メーカー所定の方法によりレブリン酸ユニットを脱保護した。生じた水酸基に対して、上記の脂質化ホスホロアミダイトを反応させることにより、目的の化合物を合成した。
ユニバーサル固相担体(Glen UnySupport 500 (GlenResearch, 20-5040))上で、Asymmetric Doubler(Lev) Phosphoramidite (GlenResearch, 10-1981)を用いて最初のカップリングを行った後に、相補鎖DNAの配列を合成した。次いで、固相担体上で脱トリチル化を行った後に、メーカー所定の方法によりレブリン酸ユニットを脱保護した。生じた3’および5’-末端の水酸基に対して、上記の脂質化ホスホロアミダイトを反応させることにより、目的の化合物を合成した。
5'-Lipo-compK3:5'-Lipo^G^A^G^AACGCTCGAGA^G^T-3'
3'-Lipo-compK3:5'-G^A^G^AACGCTCGAGA^G^T^Lipo-3'
5',3'-di-Lipo-compK3:5'-Lipo^G^A^G^AACGCTCGAGA^G^T^Lipo-3'
<HPLC条件(F)>
以下のグラジェント条件で、A液を0.1Mヘキサフルオロイソプロパノール(HFIP)、8mMトリエチルアミン(TEA)、B液をメタノールとし、カラムはClarity(登録商標) 2.6μm Oligo-MS 100A (LC-Column 50 x 2.1mm)(Phenomenex Inc)を用い、カラム温度60℃、流速0.5mL/分で、HPLCを行った。
0分 A:90% B: 10%
~7分 A:10% B: 90%
CpG30(S)a-mTRP2pep9のPBS溶液と上記(1)で合成した脂質修飾compK3のPBS溶液を、それぞれ終濃度が3.4μMになるように1.5 mLチューブ内にて混合した。これを90℃の湯浴に入れることにより加温した後、一晩放置することで徐々に室温に戻した(この冷却過程で二本鎖が形成される)。この溶液50μLをマウスに投与すると、ペプチド200 ng相当を投与することとなる。
下記表6に記載の組み合わせの5種類の二本鎖複合体を得た。二本鎖複合体の形成は、ポリアクリルアミドゲル等を用いた電気泳動、サイズ排除クロマトグラフィーなどの液体クロマトグラフィー、紫外分光法を用いた融解温度測定、静的光散乱法測定による会合体分子量測定、等で確認することができる。
(1)合成法
以下の方法により、MHC-2結合ペプチド由来のCpG DNA(S)部分を有する2種類のコンジュゲートCpG30(S)a2-OVA2-15および、CpG30(S)a2-OVA2-17を合成した。合成した化合物を下記式および表7に示す。
実施例6と同様の方法により、CpG30(S)a2およびそのSPDP修飾体を合成した。
(1-2)N末端修飾ペプチドの合成
N末端システイン修飾ペプチドは、一般的なFmoc固相ペプチド合成法にて合成した。合成したペプチドのアミノ酸配列を以下に示す。
合成したペプチドのアミノ酸配列を以下に示す。
C-OVA2-14:CSQAVHAAHAEINEA(配列番号48)
C-OVA2-16:CSQAVHAAHAEINEAGR(配列番号51)
C-OVA2-16は、前記オボアルブミンの325-340のアミノ酸配列からなるペプチドのN末端にシステインを付加したペプチドである。C-OVA2-16は、前記OVAペプチド2のN末端1残基を削除し、N末端にシステインを付加したペプチドである。
(1-1)で合成したSPDP修飾CpG DNA(S)と(1-2)で合成したペプチドとを用いて、実施例6の(1-3)と同様の方法により、CpG DNA(S)-ペプチドコンジュゲートを合成した。
抗原としてCpG DNA(S)-ペプチドコンジュゲートを、マウス(C57BL/6マウス(♂、7週齢))に皮内投与した。CpG DNA(S)-ペプチドコンジュゲートの投与量は、1尾あたりペプチド換算で1000 ngとした。投与から1週間後に脾細胞を取り出し、96ウェルディッシュに1.0×106 cells/100μLで播種し(培地;RPMI1640)、OVA由来のMHC-2結合性の抗原ペプチド(OVA324-340:ISQAVHAAHAEINEAGR(配列番号42))を10μg/mLとなるように添加した。24時間後に培地中のインターフェロンγ(IFN-γ)をIFN gamma Mouse ELISA Kit (Invitrogen, IFN gamma 'Femto-HS' High Sensitivity Mouse Uncoated ELISA Kit)を用いて定量した。CpG DNA(S)-ペプチドコンジュゲートの投与によりマウスが免疫化された場合、培地中への抗原ペプチドの添加による刺激により、脾細胞中の抗原特異的CD4+ T細胞が活性化し、IFN-γを分泌する。
CpG30(S)a2-OVA2-15および、CpG30(S)a2-OVA2-17をそれぞれ投与したマウスの脾細胞では、ともに高いIFN-γ分泌活性が見られた(図15および17;CpG30(S)a2-OVA2-18については参考例3参照。)。MHC-2結合ペプチドを用いてコンジュゲートを作製する場合には、C末端のペプチドを削除してもよいことが示された。
(1)合成法
以下の方法により、MHC-2結合ペプチド由来のCpG DNA(S)部分を有する2種類のコンジュゲートCpG30(S)a2-OVA2-18およびCpG30(S)a2-OVA2-18cを合成した。合成した化合物を下記式および表8に示す。
実施例6と同様の方法により、CpG30(S)a2およびそのSPDP修飾体を合成した。
(1-2)N末端修飾ペプチドおよびC末端修飾ペプチドの合成
N末端システイン修飾ペプチドおよびC末端システイン修飾ペプチドは、一般的なFmoc固相ペプチド合成法にて合成した。
合成したペプチドのアミノ酸配列を以下に示す。
C-OVA2-17:CISQAVHAAHAEINEAGR(配列番号49)
OVA2-17-C:ISQAVHAAHAEINEAGRC(配列番号50)
OVA2-17-Cは、オボアルブミンの324~340のアミノ酸配列からなるペプチドのC末端にシステインを付加したペプチドである。C-OVA2-17は、前記OVAペプチド2のC末端にシステインを付加したペプチドである。
(1-1)で合成したSPDP修飾CpG DNA(S)と(1-2)で合成したペプチドとを用いて、実施例6の(1-3)と同様の方法により、CpG DNA(S)-ペプチドコンジュゲートを合成した。
抗原としてCpG DNA(S)-ペプチドコンジュゲートを、マウス(C57BL/6マウス(♂、7週齢))に皮内投与した。CpG DNA(S)-ペプチドコンジュゲートの投与量は、1尾あたりペプチド換算で1000 ngとした。投与から1週間後に脾細胞を取り出し、96ウェルディッシュに1.0×106 cells/100μLで播種し(培地;RPMI1640)、OVA由来の抗原ペプチド(OVA324-340:ISQAVHAAHAEINEAGR(配列番号42))を10μg/mLとなるように添加した。24時間後に培地中のインターフェロンγ(IFN-γ)をIFN gamma Mouse ELISA Kit (Invitrogen, IFN gamma 'Femto-HS' High Sensitivity Mouse Uncoated ELISA Kit)を用いて定量した。CpG DNA(S)-ペプチドコンジュゲートの投与によりマウスが免疫化された場合、培地中への抗原ペプチドの添加による刺激により、脾細胞中の抗原特異的CD4+ T細胞が活性化し、IFN-γを分泌する。
CpG30(S)a2-OVA2-18を投与したマウスの脾細胞では、高いIFN-γ分泌活性が見られた(図15および16)。
またCpG30(S)a2-OVA2-18を投与した場合と同等またはそれより高い活性が、CpG30(S)a2-OVA2-18cを投与したマウスの脾細胞で見られた(図16)。MHC-2結合ペプチドを用いてコンジュゲートを作製する場合には、C末端側にCpG DNA(S)をコンジュゲートさせてもよいことが示された。
(1)合成法
(1-1)CpG DNA(S)誘導体の合成
5'末端に6-メルカプトヘキシル基を有するCpG DNA(S)の合成は、ホスホロアミダイト法を用いてCpG DNA(S)の配列を合成した後に、5'-thiol-modifier C6(S-Trityl-6-mercaptohexyl-1-[(2-cyanoethyl)-(N,N-diisopropyl)]-phosphoramidite)を反応させることで行った。これらの合成には、受託合成サービス(株式会社ジーンデザイン)を利用した。
得られた6-メルカプトヘキシル修飾CpG DNA(S)は、5'末端に下記の式で表される構造を有する。以下、5'末端に下記の式で表される構造を有するCpG DNA(S)誘導体のうち、配列番号6の配列を有するものを「CpG30(S)a3」と称する。
実施例1と同様に、C-TRP2-8:CVYDFFVWL(配列番号32)を合成した。
(1-1)で合成したCpG30(S)a3に対して、30モル等量のNpys-OMe (CAS: 68118-08-1)を33%ジメチルスルホキシド(DMSO)水溶液中で混合し、一晩反応させた。次に(1-2)で合成したペプチドを5モル等量、50%ジメチルスルホキシド(DMSO)水溶液中で混合し、40℃で2時間反応させた。反応後、HPLC精製でCpG DNA(S)-ペプチドコンジュゲートを分取し、CpG30(S)a3-mTRP2pep9を得た。
また、(1-1)で合成したPPC-NHS ester修飾CpG DNA(S)に対して、(1-2)で合成したペプチドを5モル等量、50%ジメチルスルホキシド(DMSO)水溶液中で混合し、40℃で2時間反応させた。反応後、HPLC精製でCpG DNA(S)-ペプチドコンジュゲートを分取し、CpG30(S)a2-MeS-mTRP2pep9を得た。
実施例2と同様の方法により、CpG30(S)a3-mTRP2pep9による細胞傷害性T細胞誘導能を評価した。投与量は、1尾あたりペプチド換算で200 ngとした。対照として、CpG30(S)a2-mTRP2pep9(K3由来のCpGモチーフを含むコンジュゲート;実施例6参照)を用いた。
結果を図18に示す。CpG30(S)a3-mTRP2pep9は、スペーサー構造の異なるCpG30(S)a2-mTRP2pep9と同様に、細胞傷害性T細胞誘導能を有することが示された。
(1)合成法
システインの代わりにシステイン類縁体によってN末端が修飾されたペプチドを用いて、実施例1と同様の方法により、CpG DNA(S)-ペプチドコンジュゲートを合成した。合成した化合物を下記式および表10に示す。なお、N末端修飾ペプチドとして、N末端のアミノ酸が、非天然アミノ酸である下記の合成ペプチドを用いた。
dC-mTRP2pep8: D-cysteine-VYDFFVWL(配列番号52)
homoC-mTRP2pep8: L-homocysteine-VYDFFVWL(配列番号53)
Pen-mTRP2pep8: L-penicillamine-VYDFFVWL(配列番号54)
実施例2と同様の方法により、CpG30(S)a2-Pen-mTRP2pep8による細胞傷害性T細胞誘導能を評価した。投与量は、1尾あたりペプチド換算で200 ngとした。対照として、CpG30(S)a2-mTRP2pep9(K3由来のCpGモチーフを含むコンジュゲート;実施例6参照)を用いた。
結果を図18に示す。システイン類縁体を含むCpG30(S)a2-Pen-mTRP2pep8は、CpG30(S)a2-mTRP2pep9と同様に、細胞傷害性T細胞誘導能を有することが示された。
(1)合成法
以下の(1-1)~(1-3)の方法を用いて、CpG DNAの両末端にペプチドを有するCpG DNA(S)-ペプチドコンジュゲートを合成した。合成した化合物を下記式および表11に示す。なお、N末端修飾ペプチドとして、C-TRP2-8を用いた(実施例1(2)参照)。
5'および3'両末端にAmino Linkerを結合させたCpG DNA(S)の合成は、ホスホロアミダイト法を用いて、3'-Amino-Modifier C6-dC CPG(Link Technologies Ltd.)を用いてCpG配列を合成した後、5'末端にssH Amino Linkerを反応させることで行った。これらの合成には、受託合成サービス(株式会社ジーンデザイン)を利用した。
合成したCpG DNA(S)の塩基配列は、実施例1(1)に記載のCpG30aと同じである。
得られたアミノ基修飾CpG DNA(S)は、5’末端に下記の式で表される構造を有し
さらに、CpG30(S)a4と、スクシイミジル6-[3'-(2-ピリジルジチオ)-プロピオンアミド]ヘキサノエート(LC-SPDP)とを1:30モル比でリン酸緩衝液(pH8.0)中で混合し、40℃で3時間静置した後、NAP-5カラムを用いてSPDP修飾CpG DNA(S)a4を精製した。
実施例1と同様に、C-TRP2-8:CVYDFFVWL(配列番号32)を合成した。
(1-1)で合成したSPDP修飾CpG DNA(S)a4に対して、(1-2)で合成したペプチドを5乃至10モル等量、50%ジメチルスルホキシド(DMSO)水溶液中で混合し、40℃で2時間反応させた。反応後、HPLC精製でCpG DNA(S)-ペプチドコンジュゲートを分取した。分取に使用したHPLC条件および保持時間を表11に示す。
配列番号2:K3-20(b)
配列番号3:K3-21
配列番号4:K3-24
配列番号5:K3-27
配列番号6:K3-30(a)
配列番号7:K3-30(b)
配列番号8:K3-40
配列番号9:K3-30(c)
配列番号10:K3-30(d)
配列番号11:K3-30(e)
配列番号12:K3-30(f)
配列番号13:K3-26(a)
配列番号14:K3-26(b)
配列番号15:ODN1668
配列番号16:ODN1668-30
配列番号17:ODN1668-40
配列番号18:ODN1826
配列番号19:ODN1826-30
配列番号20:ODN1826-40
配列番号21:ODN2006
配列番号22:ODN2006-30
配列番号23:ODN2006-40
配列番号24:ODN684
配列番号25:ODN684-30
配列番号26:ODN684-40
配列番号27:ODN D-SL01
配列番号28:ODN D-SL01-35
配列番号29:C-CpG#1
配列番号30:C-OVA8
配列番号31:C-TRP2-9
配列番号32:C-TRP2-8
配列番号33:C-gp100-9
配列番号34:C-gp100-8
配列番号35:CM-TRP2-9
配列番号36:C-TRP2-13
配列番号37:C-TRP2-11
配列番号38:C-OVA2-17
配列番号39:C-OVA2-14
配列番号40:C-OVA2-11
配列番号41:OVAペプチド1
配列番号42:OVAペプチド2
配列番号43:1018ISS
配列番号44:1018ISS#30
配列番号45:1018ISS#40
配列番号46:C-OVA7
配列番号47:compK3
配列番号48:C-OVA2-14
配列番号49:C-OVA2-17
配列番号50:OVA2-17-C
配列番号51:C-OVA2-16
配列番号52:dC-mTRP2pep8;1番目のアミノ酸はD-システインである。
配列番号53:homoC-mTRP2pep8;1番目のアミノ酸はL-ホモシステインである。
配列番号54:Pen-mTRP2pep8;1番目のアミノ酸はL-ペニシラミンである。
Claims (32)
- ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記免疫誘導剤。 - 前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合である、請求項1に記載の免疫誘導剤。
- 前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体である、請求項1または2に記載の免疫誘導剤。
- 前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合である、請求項1から3のいずれか一項に記載の免疫誘導剤。
- 前記MHC結合ペプチドが、MHC-1結合ペプチドである、請求項1から4のいずれか一項に記載の免疫誘導剤。
- 前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドである、請求項5に記載の免疫誘導剤。
- 前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下である、請求項5または6に記載の免疫誘導剤。
- 前記MHC結合ペプチドが、MHC-2結合ペプチドである、請求項1から4のいずれか一項に記載の免疫誘導剤。
- 前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体である、請求項1~8のいずれか一項に記載の免疫誘導剤。
- 前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、15以上40以下である、請求項1から9のいずれか一項に記載の免疫誘導剤。
- 前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下である、請求項10に記載の免疫誘導剤。
- 前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、請求項1から11のいずれか一項に記載の免疫誘導剤。
- 前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の50%以上がホスホロチオエート結合で置換されている、請求項12に記載の免疫誘導剤。
- 前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されている、請求項13に記載の免疫誘導剤。
- 請求項1に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、
前記免疫誘導剤。 - 請求項1に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩を有効成分として含む免疫誘導剤であって、
前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体であり、
前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合であり、
前記MHC結合ペプチドが、MHC-1結合ペプチドであり、
前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドであり、
前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下であり、
前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されており、
前記スペーサーが、下記のいずれかの式で表される構造を有する、
前記免疫誘導剤。
- アジュバントとして、免疫賦活活性を有する物質をさらに含む、請求項1から19のいずれか一項に記載の免疫誘導剤。
- 請求項1から20のいずれか一項に記載の免疫誘導剤を含む医薬組成物。
- 感染症、腫瘍、またはアレルギー性疾患の治療または予防用である、請求項21に記載の医薬組成物。
- 腫瘍の治療または予防用である、請求項21に記載の医薬組成物。
- 患者に対して請求項1から20のいずれか一項に記載の免疫誘導剤を投与することを含む、感染症、腫瘍、またはアレルギー性疾患の治療または予防方法。
- 患者に対して請求項1から20のいずれか一項に記載の免疫誘導剤を投与することを含む、腫瘍の治療または予防方法。
- 感染症、腫瘍、またはアレルギー性疾患の治療または予防に使用するための請求項1から20のいずれか一項に記載の免疫誘導剤。
- 腫瘍の治療または予防に使用するための請求項1から20のいずれか一項に記載の免疫誘導剤。
- 感染症、腫瘍、またはアレルギー性疾患の治療または予防用医薬の製造のための、請求項1から20のいずれか一項に記載の免疫誘導剤の使用。
- 腫瘍の治療または予防用医薬の製造のための、請求項1から20のいずれか一項に記載の免疫誘導剤の使用。
- ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記ポリヌクレオチド-ペプチドコンジュゲートは、CpGモチーフを含む1本鎖ポリヌクレオチドまたはポリヌクレオチド誘導体と、ペプチドと、一端側で前記ポリヌクレオチドまたはポリヌクレオチド誘導体と共有結合し他端側で前記ペプチドと共有結合したスペーサーとからなり、
前記ペプチドは、MHC結合ペプチドのN末端の1または複数の連続するアミノ酸が、前記スペーサーとの共有結合を形成させるための反応性官能基を有するアミノ酸に置換されたペプチドであり、ここで前記1または複数の連続するアミノ酸は、MHC結合のためのアンカー残基を含まない、前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。 - 請求項30に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記スペーサーと前記ポリヌクレオチドまたはポリヌクレオチド誘導体との間の共有結合および前記スペーサーと前記ペプチドとの間の共有結合の一方または両方が、生体環境中で切断可能な共有結合であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体である、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。 - 請求項30に記載された、ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩であって、
前記スペーサーとの共有結合を形成させるため反応性官能基を有するアミノ酸が、システインまたはチオール基を有するその類縁体であり、
前記スペーサーと前記ペプチドとの間の共有結合が、ジスルフィド結合であり、
前記MHC結合ペプチドが、MHC-1結合ペプチドであり、
前記MHC-1結合ペプチドが、HLA-A結合ペプチドまたはHLA-B結合ペプチドであり、
前記MHC-1結合ペプチドのアミノ酸長が、8以上11以下であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体が、2以上のCpGモチーフを含むポリデオキシリボヌクレオチド(DNA)またはDNA誘導体であり、
前記ポリヌクレオチドまたはポリヌクレオチド誘導体の塩基長が、20以上30以下であり、
前記リン酸ジエステル結合の少なくとも一部がホスホロチオエート結合で置換されたポリヌクレオチド誘導体において、リン酸ジエステル結合の90%以上がホスホロチオエート結合で置換されており、
前記スペーサーが、下記のいずれかの式で表される構造を有する、
前記ポリヌクレオチド-ペプチドコンジュゲート又はその医薬上許容される塩。
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US17/907,531 US20230144876A1 (en) | 2020-03-27 | 2021-03-26 | Immune inducer containing polynucleotide-peptide conjugate and pharmaceutical composition containing same |
AU2021241229A AU2021241229A1 (en) | 2020-03-27 | 2021-03-26 | Immune inducer containing polynucleotide-peptide conjugate and pharmaceutical composition containing same |
EP21776683.1A EP4129344A4 (en) | 2020-03-27 | 2021-03-26 | IMMUNE INDUCER CONTAINING A POLYNUCLEOTIDE-PEPTIDE CONJUGATE AND PHARMACEUTICAL COMPOSITION CONTAINING THE SAME |
BR112022018361A BR112022018361A2 (pt) | 2020-03-27 | 2021-03-26 | Indutor imune contendo conjugado polinucleotídeo-peptídeo e composição farmacêutica contendo o mesmo |
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- 2021-03-26 JP JP2022510723A patent/JPWO2021193900A1/ja active Pending
- 2021-03-26 CA CA3175889A patent/CA3175889A1/en active Pending
- 2021-03-26 WO PCT/JP2021/012787 patent/WO2021193900A1/ja active Application Filing
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- 2021-03-26 AU AU2021241229A patent/AU2021241229A1/en active Pending
- 2021-03-26 CN CN202180024931.3A patent/CN115427079A/zh active Pending
- 2021-03-26 EP EP21776683.1A patent/EP4129344A4/en active Pending
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CN115427079A (zh) | 2022-12-02 |
US20230144876A1 (en) | 2023-05-11 |
CA3175889A1 (en) | 2021-09-30 |
BR112022018361A2 (pt) | 2022-11-08 |
JPWO2021193900A1 (ja) | 2021-09-30 |
KR20220160036A (ko) | 2022-12-05 |
EP4129344A1 (en) | 2023-02-08 |
AU2021241229A1 (en) | 2022-10-13 |
EP4129344A4 (en) | 2024-08-14 |
TW202146037A (zh) | 2021-12-16 |
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