WO2011054994A1 - Sistemas de expresión regulada - Google Patents
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- WO2011054994A1 WO2011054994A1 PCT/ES2010/070715 ES2010070715W WO2011054994A1 WO 2011054994 A1 WO2011054994 A1 WO 2011054994A1 ES 2010070715 W ES2010070715 W ES 2010070715W WO 2011054994 A1 WO2011054994 A1 WO 2011054994A1
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- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2799/00—Uses of viruses
- C12N2799/02—Uses of viruses as vector
- C12N2799/021—Uses of viruses as vector for the expression of a heterologous nucleic acid
- C12N2799/025—Uses of viruses as vector for the expression of a heterologous nucleic acid where the vector is derived from a parvovirus
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N2830/00—Vector systems having a special element relevant for transcription
- C12N2830/001—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination
- C12N2830/002—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination inducible enhancer/promoter combination, e.g. hypoxia, iron, transcription factor
- C12N2830/003—Vector systems having a special element relevant for transcription controllable enhancer/promoter combination inducible enhancer/promoter combination, e.g. hypoxia, iron, transcription factor tet inducible
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N2830/00—Vector systems having a special element relevant for transcription
- C12N2830/008—Vector systems having a special element relevant for transcription cell type or tissue specific enhancer/promoter combination
Definitions
- the invention is within the field of adjustable expression systems and, more specifically, within the spatially adjustable expression (in a given tissue) and temporally (in response to the addition of an inducing agent).
- the invention also relates to gene constructs and virions that allow regulated hepato-specific expression as well as the use thereof for the treatment of liver diseases.
- the functions of the liver include, among others, carbohydrate and lipid metabolism, cytokine secretion, elimination of insulin and other hormones, bile production, etc.
- factors that affect numerous genetic, cardiovascular, metabolic, hemorrhagic and cancerous diseases occur in the liver.
- the liver cells have high half-life and are directly connected to the bloodstream, which facilitates the arrival of therapeutic agents. For these reasons, the liver is considered to be a good candidate for gene therapy.
- inducible systems In order to avoid the effects resulting from the constant expression of genes of interest, inducible systems have been developed in which the expression takes place only in the presence of a certain inducing agent.
- an inducible system of temporally and spatially controllable expression is known based on the use of a promoter that is activatable in the presence of a chimeric transcription factor whose activity is induced in the presence of mifepristone (RU486) (see Wang et al., Nat. Biotechnol., 1997, 15: 239-43).
- This type of regulation can be applied to any cell type using a tissue specific promoter.
- This system is specific, reversible and non-toxic. However, it has the disadvantage that it leads to high levels of expression in basal conditions, which makes it unacceptable if its application is desired in vivo.
- Zabala and cois have described plasmid vectors that include different embodiments of a tetracycline-inducible expression system (tet-on) where all comprise a sequence encoding a transgene (luciferase, or IL- 12) that is transcribed from a transcriptional unit controlled by an operator-promoter sequence consisting of 7 copies of the tetracycline Operator (tet07) attached to the albumin promoter (Palb); this system also includes a sequence encoding a reverse rtTA transactivator ( rtTA2s-M2), placed under the control of hepato-specific promoter sequences, different according to the embodiments, selected from EIIPalAT (promoter of the human al-antitrypsin gene, PalAT fused with the core antigen enhancer region of hepatitis B virus, IBD ), EalbPalAT (promoter of the human al-antitrypsin gene
- the basal expression of the transgene was directly proportional to the strength of the hepato-specific promoter used to control the expression of rtTA; the ability to induce transgenic expression was inversely proportional to baseline expression (maximum induction rate when Phpx, the weakest promoter was used); however the levels Expression maximums after induction were directly proportional to the promoter potency, that is, the strongest promoter expressed the highest levels after induction.
- the transcriptional units for the rtTA and the transgene are arranged in tandem, the transgenic expression is greater than when they are arranged in opposite directions.
- the use of a Palb promoter to direct transgenic expression was associated with a lower expression of the transgene, compared to that obtained with a system in which the minimum cytomegalovirus promoter was used.
- Chtarto and cois describe an AAV vector for the inducible expression of a transgene (reporter gene eGFP, enhanced GFP) from a bi-directional tetracycline-inducible transgenic expression system.
- Said system includes a sequence containing the tet07 operating region flanked on both sides by minimal cytomegalovirus promoter sequences (pCMVm) that direct, in opposite directions, the transcription of a transactivator (rtTA) activatable by tetracyclines and the transgene, so that in presence of doxycycline the rtTA transactivator induces transcription of the transgene and of itself.
- pCMVm minimal cytomegalovirus promoter sequences
- the system also includes bidirectional SV40 polyadenylation signals.
- This self-regulating system exhibits an induction capacity for the expression of a transgene in tumor cell lines and for in vivo expression in the brain.
- this same group describes an improved version of the vector carrying a mutated rtTA transactivator, and which allows expressing GDNF in the striatum nucleus in biologically active concentrations that suppress tyrosine hydroxylase in rats treated with doxycycline but not in non-induced controls.
- no data are available.
- These vectors are suitable for obtaining a transgenic expression in the liver with the aforementioned requirements.
- inducible expression vectors based on the use of tetracycline-sensitive transactivators and minimal CMV promoter do not have good behavior for specific controlled expression in liver but, on the contrary, gene expression systems heterologists that include the human albumin (pAlb) promoters in substitution of the minimum pCMV promoters allow not only to obtain a lower and more specific basal expression in the liver but also, surprisingly, allow to obtain expression levels, after induction, higher than those obtained with stronger promoters of the minimum CMV type.
- pAlb human albumin
- the present invention relates, in a first aspect, to a gene construct that allows inducible hepato-specific expression of a polynucleotide of interest in response to an inducing agent comprising
- a bidirectional inducible operator-promoter comprising at least one response element to said inducing agent flanked by a first hepato-specific promoter sequence and by a second hepato-specific promoter sequence wherein both hepato-specific promoter sequences act divergently,
- a first nucleotide sequence comprising a sequence encoding a transactivator activatable by said inducing agent and a polyadenylation signal located at position 3 'with respect to the region encoding the transactivator, wherein said sequence encoding a transactivator is operatively coupled to the first hepato-specific promoter sequence and
- a second nucleotide sequence comprising a polynucleotide that is operatively coupled to the second hepatospecific promoter sequence and a 3 'position polyadenylation signal with respect to the polynucleotide of interest
- the invention relates to a vector, a viral genome or a virion comprising the gene construct of the invention.
- the invention relates to a virion obtainable by expressing a viral genome of the invention in a suitable packaging cell.
- the invention relates to an in vitro method for expression in a cell of hepatic origin of a polynucleotide of interest comprising the steps of
- the invention relates to a pharmaceutical composition gene construct according to the invention, to a vector according to the invention, to a viral genome according to the invention or to a virion according to the invention as well as to the use thereof as a medicament or for its use in the treatment of liver disease.
- the invention relates to a bidirectional inducible operator-promoter suitable for hepatospecific expression and inducible by a two polynucleotide inducing agent of interest comprising
- first and second hepato-specific promoter sequence act divergently with respect to the response element to the inducing agent and wherein the promoter activity of the first and second hepato-specific promoter sequence is increased in the presence of said inducing agent and in the presence of a transactivator that joins the response element.
- the invention relates to a gene construct suitable for hepatospecific expression and inducible by a polynucleotide inducing agent of interest comprising
- first and second hepato-specific promoter sequence act divergently with respect to the response element to the inducing agent and wherein the promoter activity of the first and second hepato-specific promoter sequence is increased in the presence of said inducing agent and in the presence of a transactivator that binds to the response element in the bidirectional inducible operator-promoter.
- FIG. 1 Schematic of the structure of the expression system of a tetracycline inducible transgene of the invention.
- bidirectional operator-promoter sequence (2) bidirectional element of response to the active form of the transactivator; (3) promoter sequences comprising a hepatospecific promoter (preferably an albumin promoter (pAlb) or a minimum albumin promoter (pmAlb)); (4) sequence encoding a reverse transactivator activatable by an inducing agent, preferably by tetracyclines (rtTA); (5) sequence encoding a transgene of interest; (6) polyadenylation signals (polyA or pA).
- pAlb albumin promoter
- pmAlb minimum albumin promoter
- the bidirectional operator-promoter sequence controls the transcription of the sequences encoding the transactivator (preferably rtTA) (4) and the transgene of interest (5); Its promoter activity is in turn induced by the transactivator protein (preferably rtTA) (4) in the presence of the inducing agent (preferably tetracycline or a tetracycline analog such as doxycycline).
- the inducing agent preferably tetracycline or a tetracycline analog such as doxycycline.
- FIG. 1 Structure of different recombinant adeno-associated viruses, in which an expression system of a tetracycline inducible transgene, used in the examples, has been incorporated.
- rAAV-pTetbidi-pCMV-luc The genome of this adeno-associated virus incorporates a tetracycline-inducible bidirectional expression system that includes an operating region with 7 copies of 42 bases of the tetracycline Operator (tet07), flanked by 2 minimum cytomegalovirus promoters (pCMV); the operator-promoter controls the expression of 2 sequences, placed one on each side, which respectively encode a reverse transactivator rtTA-M2 and luciferase (luc) as a transgene of interest; as bidirectional polyadenylation signals of SV40 have been incorporated as polyadenylation (pA) signals; flanking the expression cassette, the 5 'ITR (inverted terminal repeat) and 3' ITR of adeno-associated virus type 2 (AAV2) have been included.
- tetracycline Operator tetracycline Operator
- pCMV 2 minimum cytomegalovirus promoters
- luc
- rAAV-pTetbidi-pAlb-luc The genome of this adeno-associated virus incorporates a two-way tetracycline-inducible expression system that includes the same elements as the rAAV-pTetbidi-pCMV-luc virus, with the only difference that the minimal pCMV promoters have been replaced by the promoter sequences of the albumin gene (pAlb).
- rAAV-pTet b i d i-pAlb-mIL12 The genome of this adeno-associated virus incorporates a two-way tetracycline inducible expression system that includes the same elements as the rAAV-pTetbidi-pAlb-luc virus, with the only difference that the luciferase gene has been replaced by the sequences of the single chain mouse IL12 (Lieschke, GJ, et al. Nat Biotechnol, 1997. 15: 35-40).
- FIG. 1 Bio luminescence images obtained by CCD camera. They show the regions that are selected for the measurement of luciferase activity levels. A) Upper abdominal area (includes the liver), and B) Bioluminescence levels emitted throughout the animal.
- Figure 4 Measurement of luciferase activity (photons / sec) in female BALB / ca mice that injected virions or viral particles containing rAAV-pTetbidi-pCMV-luc recombinant virus genomes (in doses of 10 x 10 , 3 x 10 and 10 10 11 viral genomes (gv) per mouse, depending on the groups).
- Injected virions were AAV2 / 8 virions, which contained genomes constructed on AAV2 virus ITRs but packaged in AAV8 capsids (formed by capsid proteins corresponding to an AAV of serotype 8).
- each animal was administered doxycycline (50 mg / kg of weight; via ip), and after 24 hours the induction was maintained by administering doxycycline (dox) for 7 days in drinking water (2 mg / ml doxycycline; 5% sucrose).
- the lines indicate luciferase activity measured over time, expressed in days t (d) from the first ip administration of doxycycline (day 0).
- Activity levels in the liver area are represented with solid lines; Activity levels throughout the animal are represented by dashed lines.
- FIG. 5 Measurement of luciferase activity (photons / sec) in mice injected with AAV2 / 8 virions containing rAAV-pTetbidi-pCMV-luc virus genomes (lxlO 10 , 3x l 0 10 , and lxlO 11 gv / mouse) .
- the measurements were made after repeated inductions with increasing doses of doxycycline (mg / kg; via ip), separated by a period 15 days Luciferase activity was measured in the upper abdominal or hepatic area after 24 hours after the ip administration of doxycycline.
- Luciferase activity photons / sec measured in BALB / ca females which were injected intravenously with AAV2 / 8 virions containing genomes of the rAAV-pTetbidi-pAlb-luc recombinant virus (lx 10 11 gv / mouse) .
- Activity was measured at baseline before induction with doxycycline (Dose 0), and at induced state 24 hours after administration by ip of 50 mg / kg of weight (Dose 50); These measurements were made both in the upper abdominal area (Liver) and in the whole animal (Total).
- Figure 7 Comparison between luciferase activities (photons / sec) measured at baseline (Dose 0) and induced, 24 hours after ip administration of 50 mg / Kg of doxycycline (Dose 50) in female BALB / mice c injected with AAV2 / 8 virions containing rAAV-pTetbidi-pCMV-lu code rAAV-pTetbidi-pAlb-luc genomes (10 x 11 gv / mouse; iv route). The measurements were performed in the upper abdominal area (liver).
- FIG. 8 Luciferase activity (photons / sec) in BALB / c females injected with AAV2 / 8 virions incorporating rAAV-pTetbidi-pAlb-luc virus genomes (at doses of 10 x 11 and 10 x 10 gv / mouse according to groups; iv). The activity was measured at baseline (Induction 0) and 24 hours after induction with 50 mg / Kg of doxycycline in 4 cycles of repeated induction (Induction 1, 2, 3 and 4 respectively). 15 days passed between induction 1 and induction 2, and between 2 and 3; 80 days passed between Induction 3 and Induction 4.
- FIG. 9 A) Luciferase activity (photons / sec) of females and C57BL / 6 males injected with AAV2 / 8 virions carrying rAAV-pTetbidi-pAlb-luc genomes (lx 10 11 gv / mouse; iv), measured in basal and induced state, after induction with different doses of doxycycline.
- Basal activity measurement was performed on day 14 after the corresponding virus injection; the measurement In an induced state it was performed 22 days after the injection of the virus and 24 hours after the administration of the dose of doxycycline.
- FIG. 10 Luciferase activity (photons / sec) measured in C57BL / 6 females and males injected with AAV2 / 8 virions carrying rAAV-pTetbidi-pAlb-luc (10 ⁇ 11 gv / mouse; iv), at baseline ( day 0) and on different days during the period of administration of doxycycline in drinking water (2 mg / ml + 5% sucrose).
- FIG. 11 Biodistribution of luciferase activity ex vivo.
- Female BALB / c (A) and C57BL / 6 (B) (N 4-8) strains were injected with rAAV-pTetbidi-pCMV-luc or rAAV-pTetbidi-pAlb-luc ( a dose of lO lx 11 gv / mouse iv).
- luciferase expression was induced by the administration of doxycycline (50 mg / kg; via ip); 24 hours after induction the animals were sacrificed; The organs were removed and luciferase activity (RLU) in each of them was measured, normalizing it by the amount of total protein (RLU / mg protein).
- FIG. 12 Biodistribution of luciferase activity ex vivo.
- Males of the strains BALB / c (A), and C57BL / 6 (B) (N 4-8) were injected with AAV2 / 8 virions carrying rAAV-pTetbidi-pCMV-luc or rAAV-pTetbidi-pAlb-luc ( a dose of lO lx 11 gv / mouse iv).
- FIG 13 Diagram of the anti-tumor treatment protocol administered to female C57BL / 6 mice after implantation of MC38 syngeneic tumor line cells.
- 5 ⁇ 10 5 MC38 cells were implanted intrahepaticly.
- Ten days after implantation day 40 of the protocol) the induction of the system was started with an ip administration of doxycline (50 mg / Kg).
- FIG. 14 Levels of transaminases, ALT (A), and AST (B), in the serum of C57BL / 6 female animals injected with AAV2 / 8 virions carrying rAAV-pTetbidi-pAlb-MM12, at three different doses: 3 > ⁇ 10 10 , lxl O 10 and 3> ⁇ 10 9 gv / mouse.
- the levels are shown in the baseline state (day 0 of induction), on day 1, 4 and 7 after an initial administration of 50 mg / kg of doxycycline ip, performed on day 0 of induction followed by the administration of doxycline in water of drink (2 mg / ml dox + 5% sucrose).
- Figure 15 Percentage of survival over time, of the C57BL / 6 mice to which the protocol described in Figure 13 was applied.
- the legends show the dose of virus (in gv / mouse) that each group received intravenously at the beginning of the protocol. The control group did not receive a vector.
- Statistical evaluations were performed using the Logrank test (GraphPad Prism software) (*** p ⁇ 0.001).
- FIG. 16 Tumor size of treated mice that underwent subcutaneous rechallenge with 10 x 6 MC38 cells / mouse (B) compared to a group of untreated, control mice (A). In brackets (in B) the dose of virus expressed in gv that each mouse received according to the protocol described in Figure 13 is indicated. In (C) the tumor sizes reached by the different groups are shown at the end the experiment (day 132 of the procoto lo). In brackets, the dose of virus expressed in gv that each mouse received according to the protocol described in Figure 13 is indicated.
- FIG. 17 Percentage of CD8 / Tet + PBLs (MC38). The blood was extracted from the mice on day 23 post-rechallenge (day 113 of the protocol described in Figure 13), PBLs were obtained and labeled with anti-CD8 + antibodies and with a tetramer loaded with a specific peptide of MC38 cells. The percentage of CD8 + -MC38Tet + PBLs was analyzed using the FlowJo software. Statistical evaluations were performed using Student's t-test (* p ⁇ 0.05)
- Figure 18 Percentage of intra-tumor CD8 + lymphocytes specific to the MC38 tetramer and positive for the CD44 activation marker. Groups of treated mice were grouped because they did not show significant differences between them (A). In B and C) the diagrams of points corresponding to a mouse representative of the control group and one of the treated group are shown, respectively. Statistical evaluations were performed using Student's t test (*** p ⁇ 0.001).
- FIG. 19 Diagram of the therapeutic antitumor treatment protocol administered to female C57BL / 6 mice.
- doxycycline 50 mg / kg
- Figure 20 Percentage of survival over time of the C57BL / 6 mice to which the protocol described in Figure 19 was applied.
- the legends show the dose of virus (in gv / mouse) that the treated animals received.
- the control group did not receive a vector.
- Statistical evaluations were performed using the Logrank test (GraphPad Prism software) (*** p ⁇ 0.001). DETAILED DESCRIPTION OF THE INVENTION
- the authors of the present invention have developed a polynucleotide expression system of interest that allows precise temporal and spatial expression of said polynucleotides in the liver. To do this, they make use of an activatable bidirectional operator-promoter that is associated with a first hepato-specific promoter that controls the expression of a transactivator which activates the expression of said bidirectional promoter in the presence of an inducing agent and a second hepato-specific promoter that controls The expression of the gene of interest. In the basal state (without inducing), the hepato-specific promoter directs the expression of small amounts of both the transactivator and the transgene giving rise to what is called residual system expression. The transactivator in the absence of inducing agent is conformationally incapable of binding to the operator sites in the bidirectional promoter and, therefore, of activating the transcription of the bidirectional promoter.
- transactivator molecules In the presence of an inducer, it binds to the residual transactivator molecules present in the cell, producing a conformational change that allows it to bind to the operator sites of the bidirectional inducible promoter-operator and activate its transcription. In this way, the expression of the transgene is induced, as well as the transactivator.
- inducer In the presence of an inducer, it binds to the residual transactivator molecules present in the cell, producing a conformational change that allows it to bind to the operator sites of the bidirectional inducible promoter-operator and activate its transcription. In this way, the expression of the transgene is induced, as well as the transactivator.
- These new synthesized transactivator molecules are able to bind to the cell's free inducing agent and create a positive feedback loop or loop, until a state is reached in which two situations can occur:
- the authors of the present invention have shown how, surprisingly, the vectors developed allow hepato-specific expression after induction that reaches levels higher than that obtained by vectors in which promoters whose basal expression is higher are used.
- the maximum expression of the induction systems described to date correlates directly with the promoter potency at baseline, in the system object of the present invention where tissue specific promoters are used which are generally more weaker than ubiquitous CMV type promoters, an expression is obtained at baseline after induction that is higher than that obtained with CMV.
- example 2 of the present invention it is observed how the induction rate of a reporter gene obtained using the hepato-specific system of the invention after administration of the inducing agent is approximately 85 times higher than the induction rate of the system based on the ubiquitous CMV promoter (see figure 7), which contrasts with the results obtained by Zabala et al (Zabala, M., et al., Cancer Res. 2004; 64: 2799-2804) where the use of a Palb promoter to direct the transgenic expression was associated with a lower expression of the transgene, compared to that obtained with a system in which the minimum cytomegalovirus promoter was used.
- the difference in the induced state between both systems for this dose of dox is highly significant.
- the liver expression of a reporter gene controlled by the hepato-specific and inducible expression system of the present invention reaches levels of induction of luciferase activity greater than the system based on the ubiquitous CMV promoter (see Figure 11).
- the invention relates to a gene construct that allows inducible hepato-specific expression of a polynucleotide of interest in response to an inducing agent comprising
- a bidirectional inducible operator-promoter comprising a response element to said inducing agent flanked by a first hepato-specific promoter sequence and by a second hepato-specific promoter sequence wherein both hepato-specific promoter sequences are divergently oriented
- a first nucleotide sequence comprising a sequence encoding a transactivator activatable by said inducing agent and a polyadenylation signal located at position 3 'with respect to the region encoding the transactivator, wherein the sequence encoding an activatable transactivator is is operatively coupled to the first hepato-specific promoter sequence and
- a second nucleotide sequence comprising a polynucleotide that is operatively coupled to the second hepatospecific promoter sequence and a 3 'position polyadenylation signal with respect to the polynucleotide of interest
- gene construct refers to a single-stranded or double-stranded nucleic acid, which comprises a region capable of expressing itself and, optionally, regulatory sequences that precede said nucleic acid ( 5 'non-coding sequences) or found after said nucleic acid (3' non-coding sequences).
- gene construct and “nucleic acid construct” are used interchangeably in the present invention.
- expression refers to the transcription of a gene or genes or gene construct to give rise to structural RNA (rRNA, tRNA) or mRNA with or without the subsequent translation of said RNA into protein.
- inducible expression refers to the fact that the expression can be increased in response to an activator / inducer.
- polynucleotide of interest refers to a nucleic acid sequence that is partially or totally heterologous with respect to the cell or subject in which it is introduced and which, by virtue of the presence of regulatory regions of the expression in 5 'or 3' position with respect to said polynucleotide of interest, can be transcribed and, eventually, translated to give rise to a polypeptide with a desired biological activity.
- polynucleotide of interest should not be understood solely as a polynucleotide capable of encoding a polypeptide, but can also be used to refer to a nucleic acid sequence that is partially or totally complementary to a polynucleotide endogenous to the cell or subject in which it is to be introduced, so that after its transcription, it generates an RNA molecule (microRNA, shRNA or siRNA) capable of hybridizing and inhibiting the expression of the endogenous polynucleotide.
- the polynucleotide of interest can be DNA or cDNA.
- inducing agent refers to any molecule that is capable of causing an increase in the transcription of a gene.
- the gene whose transcription is induced in response to said inducing agent is under operational control of a transcription regulatory region which, in turn, has binding sites for a transcriptional activator whose activity increases in the presence of said inducing agent.
- response element for the inducing agent when referring to the transcription regulatory region of a gene of interest, is used to refer to the binding sites for a transcriptional activator. whose activity is increased by the binding of the inducing agent.
- the inducing agent is a compound of easy administration and distribution in the organism and safe at the doses used for Activate the system. It must also be able to penetrate the desired tissue or organ, and have a half-life of a few hours (no minutes, no days).
- the element (a) of the gene construct of the invention comprises a bidirectional inducible operator-promoter comprising a response element to a transactivator in its active form flanked by a first hepato-specific promoter sequence and by a second hepato-specific promoter sequence wherein both sequences Hepatospecific promoters are oriented divergently,
- adjustable bidirectional operator-promoter refers to a promoter that is capable of activating the transcription of specific polynucleotides in opposite directions from said "operator-promoter” in the presence of a particular signal.
- response element to an inducing agent refers to one or more DNA elements that act in cis and that give a promoter the ability to activate transcription in response to the interaction of said element with the binding domains of DNA of a transcription factor or a transactivator whose transcriptional activity is induced in the presence of the inducing agent, usually as a result of a conformational change in the transactivator resulting from binding to the inducing agent. Therefore, the expression “response element to an inducing agent” should be understood as a response element to a transcriptional activator in the presence of an inducing agent.
- the DNA binding domain of the transcription factor or transactivator is capable of binding, in the presence or absence of the activating agent, to the DNA sequence of the response element to initiate or inhibit the transcription of genes located at 3 'position with respect to to the promoter.
- the term "response element” is used interchangeably with "transcriptional response element” or TRE (transcriptional response element).
- the adjustable bidirectional promoter-operator comprises at least one response element to an antibiotic activatable trans activator, preferably a tetracycline response element and, even more preferably, a tetracycline response element comprising a Variable number of copies of the 42 base pair operating sequence (called TetO) as originally described in Barón et al.
- the copy number of the TetO can be at least 2, at least 5 or, preferably, no more than 7.
- This type of tetracycline response elements can activate transcription bi-directionally in the presence of the tetracycline activated reverse transactivator (or its doxycycline analogue) as originally described by Gossen et al. (Science, 1995, 278: 1766-1769).
- the transactivator + tetracycline response element comprises 7 copies of the operating sequence, in which case it is called Tet07.
- the operator-promoter comprises or consists of the sequence SEQ.ID.NO.:l.
- the element (a) of the gene construct additionally comprises a first and a hepato-specific promoter sequence.
- transcription promoter sequence refers to a nucleic acid sequence that is recognized by a host cell and that results in the activation of transcription of nucleic acid sequences present in position 3 'with respect to said promoter region.
- the promoter sequence contains transcriptional control sequences that allow expression of the polynucleotide of interest.
- liver promoter region of transcription refers to said region being capable of activating transcription selectively in liver cells or in cell lines derived from liver cells.
- Specific liver promoters suitable for the present invention include, without limitation, the ⁇ -trypsin promoter (AAT), the thyroid hormone binding globulin promoter, the alpha fetoprotein promoter, the alcohol dehydrogenase promoter, the promoter of IGF-II, the promoter of factor VIII (FVIII), the core core protein promoter (Basic Core Protein or BCP) of HBV and PreS2 promoter, the thyroxine-binding globulin (TBG) promoter, the liver control region hybrid (HCR) -ApoCII promoter, the HCR hybrid promoter -hAAT, the AAT promoter combined with the mouse albumin gene enhancer element (Ealb), the apolipoprotein E promoter, the low density lipoprotein promoter, the pyruv
- tissue specific promoters can be found in Tissue-Specific Promoter Datábase, TiProD (Nucleic Acids Research, J4: D104-D107 (2006).
- hybrid promoters comprising a specific liver enhancer and a specific promoter is possible of liver
- This type of promoters include the hybrid liver control region (HCR) -ApoCII promoter, the HCR-hAAT hybrid promoter, the AAT promoter combined with the mouse albumin gene enhancer element (Ealb) and a apolipoprotein E promoter, the hybrid promoter formed by the mouse albumin gene enhancer (Ealb) and the mouse alpha 1-antitrypsin (AAT) promoter (Ealb-AATp).
- the hepatospecific promoter that is part of the first expression cassette is the albumin gene promoter of murine origin or of human origin.
- the present invention contemplates the use of the complete albumin gene promoter (SEQ.ID.NO.:2) or the minimum region of said promoter (SEQ.ID.NO.:3), corresponding to nucleotides 1 13 to 196 of the complete promoter defined in SEQ.ID.NO.:2.
- the invention contemplates the use of any fragment of the promoter that includes at least the minimum promoter (residues 113-196 of the sequence SEQ ID NO: 2).
- a specific liver promoter is a promoter that is more active in the liver compared to its activity in any other body tissue.
- the activity of a specific liver promoter will be considerably higher in the liver than in other tissues.
- such a promoter can be at least 2, at least 3, at least 4, at least 5 or at least 10 times more active in liver tissue than in other types of cells.
- the activity of said promoter in cells of hepatic origin with respect to a reference cell can be determined by its ability to direct expression in a given tissue while preventing expression in other cells or tissues. Accordingly, a specific liver promoter allows an active expression of the bound gene in the liver and prevents expression in other cells or tissues.
- first and second promoter regions of hepatospecific transcription may be the same or may be different.
- both transcription regulatory regions are the same.
- both the first transcription promoter region and the second transcription promoter region comprise the albumin gene promoter.
- the albumin gene promoter that forms the first and / or second transcription promoter region comprises a sequence selected from the group of SEQ.ID.NO.:2 and SEQ.ID.NO .:3.
- the adjustable bidirectional promoter-operator comprises a tetracycline response element formed by seven transactivator binding sites activatable by the inducing agent, preferably tetracycline, which is flanked by two oriented albumin gene promoters. divergently.
- said promoter operator comprising the Tet07 operator and two albumin promoters comprises the sequence of SEQ.ID.NO.:4. Sequences with hepato-specific promoter activity are divergently oriented with respect to the operating region.
- the elements that form the bidirectional operator-promoter of the gene construct of the invention are organized so that the promoter activity of the first and second hepato-specific promoter sequence is induced as a consequence of the union of the transactivator to the operator's operating region. promoter in the presence of the inducing agent.
- said induction of the transcription promoter activity will depend, among other factors, on the distance between the operator element and the hepatospecific promoter sequences.
- the distance between the operator and the first or second promoter sequence may vary between 0 and 30 nucleotides, more preferably between 0 and 20 and even more preferably between 0 and 15 nucleotides.
- the element (b) of the gene construct of the invention is a nucleotide sequence comprising: a sequence encoding a transactivator activatable by said inducing agent that is operatively coupled to the first hepatospecific promoter sequence; and a polyadenylation signal located at position 3 'with respect to the region encoding the transactivator.
- nucleotide sequence refers to the polymeric form of the ribonucleoside phosphate ester (adenosine, guanosine, uridine or cytidine; "molecules of AN ") or deoxy ribonucleosides (deoxiadenosine, deoxyguanosine, deoxythymidine or deoxycytidine;” DNA molecules ”) or any phosphoester analog thereof such as phosphorothioates and thioesters, in the form of single strand or double strand.
- ribonucleoside phosphate ester adenosine, guanosine, uridine or cytidine
- deoxy ribonucleosides deoxiadenosine, deoxyguanosine, deoxythymidine or deoxycytidine
- DNA molecules or any phosphoester analog thereof such as phosphorothioates and thioesters
- nucleic acid sequence and, in particular, the DNA or RNA molecule, refers only to the primary or secondary structure of the molecule and does not limit no particular type of tertiary structure Thus, this term encompasses double stranded DNA as it appears in linear or circular DNA molecules, supercoiled DNA plasmids and chromosomes.
- transactivator activatable by the inducing agent refers to a polypeptide which, when bound to said inducing agent, is capable of promoting the transcription of a particular gene by binding to regions.
- specific recognition for said polypeptide in the non-coding region of said gene, that is, its activity can be modulated by means of additional factors that can be contributed or eliminated depending on the need to promote the transcription of genes comprising sites specific binding for such regulators.
- the transactivator encoded by the first nucleotide sequence of the invention is capable of binding to the region of the operator-promoter comprising the response elements to said inducing agent, so that the transactivator activates the transcription of said First and second hepatospecific promoter sequences after binding to the operator-promoter operating region in the presence of the inducing agent.
- the invention contemplates any method for regulating the expression of the transcriptional regulator provided that it allows expression in a regulated manner and with a minimum of basal transcription.
- the invention contemplates the use of transcriptional regulators whose induction takes place not by increasing the levels of expression of the transcriptional regulator but by a conformational change in response to the binding of the inducing agent that can result in translocation of the transcription factor. to the nucleus where it exerts its effect or in an increase in transcriptional activity.
- Transcriptional agents are usually formed by a DNA binding domain or DBD (DNA binding domain), a ligand binding domain or LBD (ligand binding domain), and a transcription activation domain or AD (activating domain).
- the DNA binding domain can be any domain for which there is a known specific binding element, including synthetic, chimeric or analogous DNA binding domains.
- DNA binding domains suitable for the present invention include (i) homeodomains (Scott et al., 1989, Biochim. Biophys. Acta 989: 25-48; Rosenfeld et al, 1991, Genes Dev.
- DNA binding domains in the present invention include the DNA binding domain of GAL4, LexA, transcription factors, group H nuclear receptors, nuclear receptors of the steroid / thyroid hormone superfamily.
- the person skilled in the art will appreciate that the invention contemplates the use of hybrid DNA binding domains formed by various DNA binding motifs that can recognize DNA binding sites other than those of the elements that compose them. Thus, it is possible to use DNA binding domains formed by the union of a zinc finger and a homeobox.
- the DNA binding domain is that derived from the transcriptional repressor Tet of E.coli.
- Ligand binding sequences capable of promoting the nuclear localization of a transcriptional activator containing them include the localization sequence derived from PPAR (receptors activated by peroxisomal activators), which are translocated to the nucleus.
- retinoic acid receptors that are translocated to the nucleus in the presence of the alpha, beta or gamma isomers of 9-cis-retinoic acid, X-farnesoid receptors, activated by retinoic acid and TTNPB, hepatic X receptors activated by 24-hydroxycholesterol, benzoate X receptors, activatable by 4-amino-butylbenzoate, constitutive androstane receptor, pregnan receptors, inducible by pregnolono-16-carbonitrile, steroid and xenobiotic receptors, inducible by rifampicin, progesterone receptors, activatable by medroxyprogesterone as well as by agonists and antagonists of mifepristone and rivados of 19-nortestosterone, glucocorticoid receptors activated by glucocortic
- the transcriptional activation domain can be an acidic activation domain, a proline-rich activation domain, an serine / threonine-rich activation domain and an glutamine-rich activation domain.
- acidic activation domains include the regions of VP16 and the region of GAL4 formed by amino acids 753-881.
- activation domains Proline-rich transcriptional include amino acids 399-499 of CTF / NF1 and amino acids 31-76 of AP2.
- Examples of serine-threonine-rich activation domains include amino acids 1-427 of ITF1 and amino acids 2-452 of ITF2.
- glutamine-rich activation domains include amino acids 175-269 of Octl and amino acids 132-243 of Spl.
- the sequences of each of the regions described as well as other transcriptional activation domains have been described by Seipel, K. et al. (EMBO J. (1992) 13: 4961-4968). Additionally, other transcriptional activation domains can be obtained from the above using methods known in the state of the art. Additionally, the activation domain may be the activation domain of group H nuclear receptors, of thyroid or steroid hormone nuclear receptors, the activation domain of VP16, GAL4, NF- ⁇ , B42, BP64 , or from p65.
- the transcriptional activation domain is herpes simplex virion protein 16 (hereinafter VP16), whose amino acid sequence has been described by Triezenberg, S. J. et al. (Genes Dev., 1988, 2: 718-729). This domain may be formed by about 127 amino acids of the C-terminal end of VP 16. Alternatively, the transcriptional activation domain may be formed by the 1 1 amino acids of the C-terminal region of VP16 and that maintain the ability to Activate transcription. Suitable regions of the C-terminal end of VP16 suitable for use as transcriptional activation domains have been described by Seipel, K. et al. (EMBO J. (1992) 13: 4961-4968).
- the transcriptional activator comprises the minimum region of said protein formed by 13 amino acids whose sequence is PADALDDFDLDML (SEQ.ID.NO.:5) as described by Barón et al. (Nucleics Acids. Res., 1997, 25: 2723-2729).
- the transcriptional activator is a transcriptional activator activatable by tetracycline or its analogues.
- tetracycline analogue refers to structurally related tetracycline compounds capable of binding to the tetracycline repressor (TetR) with a Ka of at least about 10 ⁇ 6 M "1 .
- TetR tetracycline repressor
- the tetracycline analogue has an affinity for TetR of at least 10 ⁇ 9 M "1.
- tetracycline analogs suitable for the present invention include, without limitation, anhydrotetracycline, doxycycline (Dox), chlorotetracycline, oxytetracycline, epioxytetracycline, cyanotetracycline, demeclocycline, meclocycline, methocycline and others described by Hlavka and Boothe, "The Tetracyclines," in “Handbook of Experimental Pharmacology 78, RK Blackwood et al.
- the tetracycline activatable transactivator may be the so-called reverse tetracycline repressor protein, or reverse tetR, which refers to a polypeptide that (i) shows specific affinity for the inducing agent, (ii) shows specific affinity by the tet type response element when it is attached to the inducing agent and (iii) moves from the tet element when it is not attached to the inducing agent.
- This activator includes both natural forms thereof and functional derivatives.
- the tetracycline adjustable activator may be the so-called tetracycline-dependent reverse transactivator (rtTA) characterized in that in the presence of tetracycline or its analogs they undergo a conformational change that allows them to become transcription activators, being inactive in the absence of tetracycline.
- rtTA tetracycline-dependent reverse transactivator
- the tetracycline-dependent reverse transactivators preferably include the rtTA transactivator or any of the rtTA variants described by Urlinger, S. et al. (Proc.Natl.Acad.Sci USA, 2000; 97: 7963-7968).
- the rtTA variant is the variant known as rtTA-M2, characterized in that it requires for its activation a doxycycline concentration 10 times lower than that required by orignal rtTA.
- the rtTA-M2 transactivator is a polypeptide encoded by the sequence polynucleotide SEQ.ID.NO .: 6.
- the element (b) of the first nucleotide sequence of the gene construct of the invention further comprises a polyadenylation sequence that is in a 3 'position with respect to the polynucleotide encoding the transactivator.
- polyadenylation sequence or “polyadenylation signal”, as used in the present invention, refers to a nucleic acid that contains a transcription termination signal and which, when it appears in an RNA transcript, allows said transcript is polyadenylated in the presence of an enzyme with polyadenyl transferase activity.
- Polyidenylation refers to the addition of a stretch of polyadenines to the 3 'end of the mRNA.
- Polyadenylation signals suitable for use in the present invention include, without limitation, the SV40 early-late polyadenylation signal, the HSV thymidine kinase polyadenylation signal, the protamine gene polyadenylation signal, the polyadenylation signal of Elb from adeno virus 5, the polyadenylation signal of bovine growth hormone, the polyadenylation signal of the human variant of growth hormone and the like.
- the polyadenylation signal is a bidirectional polyadenylation signal.
- the use of a bidirectional polyadenylation signal is particularly advantageous when the gene construct of the invention is to be expressed using viral vectors in which the termination sequences have some promoter activity of transcription (in particular AAVs, lentivirus). In this way it is avoided that it can interfere with the inducible system, and thus reduce the basal activity).
- the bidirectional polyadenylation signal corresponds to the SV40 polyadenylation signal.
- the SV40 polyadenylation signal comprises the sequence SEQ.ID.NO.:7.
- Second nucleotide sequence of the gene construct of the invention further comprises a polynucleotide that is operatively coupled to the second hepatospecific promoter sequence and a 3 'position polyadenylation signal with respect to the polynucleotide of interest.
- nucleotide sequence refers to a DNA sequence whose manipulation is desirable for various reasons and includes DNA, cDNA, genomic DNA, RNA or nucleic acid analogs as well as the corresponding molecules antisense that are capable of generating an RNA protein or molecule such as, and not limited to, small interfering RNA (siRNA), short loop RNA (shRNA) or ribozymes.
- siRNA small interfering RNA
- shRNA short loop RNA
- the polynucleotide of interest encodes a polypeptide.
- This polypeptide can be a luciferase type reporter gene, green fluorescent protein (GFP), GFP variants (EGFP. YFP or BFP), alkaline phosphatase, beta-galactosidase, beta-glucuronidase, catechol dehydrogenase.
- GFP green fluorescent protein
- EGFP GFP variants
- alkaline phosphatase beta-galactosidase
- beta-glucuronidase catechol dehydrogenase.
- polypeptides suitable for use in the treatment of liver disorders include, without limitation, an interferon ⁇ and, in particular, an IFN- ⁇ selected from the group of IFN-a2a, IFN-a2b, IFN-a4, IFN-a5, IFN-a8, oncostatin, cardiotrophin, IL-6, IGF-I and variants thereof, anfiregulin, IL-15, IL-12, CD134, CD137, PBGD, antibodies, TGF- ⁇ inhibitors such as P 17 YP peptides 144 described in international patent applications WO0031135, WO200519244 and WO0393293 which are incorporated herein by reference, IL-10 inhibitors, FoxP3 inhibitors, TNFa inhibitors, VEGF inhibitors, PD-1 inhibitors and CD152 inhibitors.
- an interferon ⁇ and, in particular, an IFN- ⁇ selected from the group of IFN-a2a, IFN-a2b, IFN-a4, IFN-a5, IFN-a8, on
- the polynucleotide of interest encodes IL-12 or a functionally equivalent variant thereof.
- Interleukin-12 is a type I cytokine that is mostly secreted by macrophages and dendritic cells, which includes both native IL-12 and recombinantly prepared IL-12 and is capable of increasing immunity antitumor through multiple mechanisms that include: (1) increased cytotoxic T lymphocyte responses, (2) activation of natural cytolytic cells (NK, natural killer), (3) promoting proliferation of natural cytolytic cells and T lymphocytes , (4) induction of the polarization of a subset of auxiliary T cells of type 1 (Thl, T helper 1), and (5) induction of an antiangiogenic effect. Many of these activities are mediated by the production and secretion of interferon- ⁇ (INF- ⁇ ) by natural cytolytic cells and activated T lymphocytes.
- INF- ⁇ interferon- ⁇
- the IL-12 cytokine is a heterodimer consisting of a heavy chain (p40) and a light chain (p35).
- Light and heavy chain sequences of human origin have been described by Gubler et al. (Proceedings of the National Academy of Sciences, USA, 1991, 88: 4143).
- the polynucleotide of interest can encode the heavy chain if the light chain is provided exogenously, it can encode the light chain if the heavy chain is exogenously supplied or it can encode both chains.
- the polynucleotide encoding IL-12 results in a single RNA comprising two open reading frames separated from each other by an internal ribosomal entry site which leads to the expression of each of the chains from each of the frames open reading.
- the polynucleotide encoding IL-12 comprises a single open reading frame encoding a fusion protein comprising light and heavy chains linked together by a linker as described in W09624676 and Lieschke GJ. et al. (Nat Biotechnol. 1997, 15: 35-40).
- the polynucleotide encoding single chain IL-12 comprises the sequence of SEQ.ID.NO.:8.
- the term "functionally equivalent variant" refers to polypeptides that differ from the sequence of IL-12 by means of one or more insertions, deletions or substitutions but which substantially maintain the biological activity of IL. -12.
- the functionally equivalent variant of IL-12 suitable for use in the present invention has a sequence identity with said cytokine of at least 50%, at least 60%, at least 70%>, at least 80%> , at least 90%>, at least 91%>, at least 92%, at least 93%), at least 94%>, at least 95%, at least 96%>, at least 97%, at least 98% or at least 99%.
- the degree of identity between variants and immunostimulatory cytokines is determined using computer algorithms and methods that are widely known to those skilled in the art.
- the identity between two amino acid sequences is preferably determined using the BLASTP algorithm [BLASTM Annual, Altschul, S., et al, NCBI NLM NIH Bethesda, Md.
- Functions of IL-12 that can be monitored to determine if a given polypeptide is a functionally equivalent variant of IL-12 includes, without limitation, differentiation of immature T cells into Thl cells, growth stimulation and function of T cells, synthesis of IFN- ⁇ and TNF- ⁇ by NK cells (natural killer), reduction in suppression of IFN- ⁇ mediated by IL-4, increase in cytotoxic activity of NK cells and CD8 + lymphocytes, stimulation of cell expression beta 1 and beta 2 chains of the IL-12 receptor and anti-angiogenic activity.
- the determination of the IL-12 activity of a variant is carried out by measuring the ability to increase antitumor immunity, determined for example by the assay described by Zabala, M. 2007 et al, [J Hepatology, vol. 47 (6): 807-815].
- the invention relates to a vector comprising a gene construct of the invention.
- the term "vector” refers to a vehicle through which a polynucleotide or a DNA molecule can be manipulated or introduced into a cell.
- the vector can be a linear or circular polynucleotide or it can be a larger polynucleotide or any other type of construction such as DNA or RNA of a viral genome, a virion or any other biological construct that allows the manipulation of DNA or its introduction in the cell.
- vector can be used interchangeably with the term vector.
- vector can be a cloning vector suitable for propagation and to obtain suitable polynucleotides or gene constructs or expression vectors in different organisms. suitable heterologists for the purification of the conjugates.
- suitable vectors include prokaryotic expression vectors such as pUC 18, pUC 19, Bluescript and their derivatives, mp l 8, mp l 9, pBR322, pMB9, CoIEl, pCRl, RP4, phages and vectors "shuttle” such as pSA3 and pAT28, yeast expression vectors such as 2 micron plasmid type vectors, integration plasmids, YEP vectors, centromeric plasmids and the like, insect cell expression vectors such as insect vectors pAC series and pVL series, plant expression vectors such as pIBI series, pEarleyGate, pAVA, pCAMBIA, pGSA, pGWB, pMDC, pMY, pORE and the like vectors and expression vectors in higher eukaryotic cells well based on vectors viral (adenovirus, adenovirus associated viruses as well as retroviruses and lenti
- the vector of the invention can be used to transform, transfect or infect cells capable of being transformed, transfected or infected by said vector.
- Said cells can be prokaryotic or eukaryotic.
- the vector where said DNA sequence is introduced can be a plasmid or a vector that, when introduced into a host cell, is integrated into the genome of said cell and is replicates together with the chromosome (or chromosomes) in which (or in which) it has been integrated.
- the obtaining of said vector can be carried out by conventional methods known to those skilled in the art (Sambrook et al, 2001, cited supra).
- the invention relates to a cell comprising a polynucleotide, a gene construct or a vector of the invention, for which said cell has been able to be transformed, transfected or infected with a construct or vector provided by it.
- Transformed, transfected or infected cells can be obtained by conventional methods known to those skilled in the art (Sambrook et al., 2001, cited supra).
- said host cell is an animal cell transfected or infected with an appropriate vector.
- Suitable host cells for the expression of the conjugates of the invention include, but are not limited to, mammalian, plant, insect, fungal and bacterial cells.
- Bacterial cells include, but are not limited to, Gram positive bacteria cells such as species of the genus Bacillus, Streptomyces and Staphylococcus and Gram negative bacteria cells such as cells of the genus Escherichia and Pseudomonas.
- Fungal cells preferably include yeast cells such as Saccharomyces, Pichia pastoris and Hansenula polymorpha.
- Insect cells include, without limitation, Drosophila cells and Sf9 cells.
- Plant cells include, among others, crop plant cells such as cereals, medicinal, ornamental or bulb plants.
- Mammalian cells suitable for the present invention include epithelial cell lines (pigs, etc.), osteosarcoma cell lines (human, etc.), neuroblastoma cell lines (human, etc.), epithelial carcinomas (human, etc.). , glial cells (murine, etc.), liver cell lines (mono, etc.).
- the gene construct of the invention may be part of a recombinant viral genome.
- the invention relates to a recombinant viral genome comprising a gene construct according to the invention.
- viral genome refers to the genetic complement of a virus either completely complete or well manipulated so that the nonessential elements have been removed while maintaining the essential elements so as to maintain adequate functionality. to infect, transduce and introduce a nucleotide sequence of interest to a target cell.
- the viral genome comprising the construction of the invention is the genome is of a recombinant adeno-associated virus.
- adeno-associated virus includes any AAV serotype.
- AAV serotypes have genomic sequences of significant homology at the level of amino acids and nucleic acid, provide an identical series of genetic functions, produce virions that are essentially physically and functionally equivalent, and are replicated and assembled by virtually identical mechanisms.
- the invention can be carried out using serotype 1 of AAV (AAV1), AAV2, AAV3 (including types 3 A and 3B), AAV4, AAV5, AAV6, AAV7, AAV8, AAV9, AAV10, AAV1 1, Avian AAV, bovine AAV, canine AAV, equine AAV, sheep AAV, and any other AAV known now or discovered later.
- AAV1 AAV
- AAV2 AAV2
- AAV3 including types 3 A and 3B
- AAV4 AAV5
- AAV6, AAV7, AAV8, AAV9 AAV10
- AAV1 1 Avian AAV
- bovine AAV canine AAV, equine AAV, sheep AAV, and any other AAV known now or discovered later.
- Genomic sequences of various AAV serotypes and autonomous parvoviruses, as well as sequences of inverted terminal repeats (ITR), Rep proteins, and capsid subunits are known in the art. Such sequences can be found in the bibliography or in public databases such as GenBank.
- the "AAV recombinant genome” refers to a vector comprising one or more polynucleotide sequences of interest, genes of interest or “transgenes” that are flanked by at least one terminal repeat sequence. inverted (ITR) parvovirus or AAV.
- ITR inverted parvovirus
- rAAV vectors can be replicated and packaged into infectious viral particles when they are present in a host cell that expresses the products of the AAV rep and cap genes (i.e. the AAV Rep and Cap proteins).
- an rAAV vector When an rAAV vector is incorporated into a major nucleic acid construct (for example, on a chromosome or another vector such as a plasmid or baculovirus used for cloning or transfection), the rAAV vector is typically referred to as a "pro-vector.” which can be "rescued” by replication and encapsidation in the presence of AAV packaging functions and necessary auxiliary functions.
- the recombinant viral genome of the invention comprises the gene construct of the invention and at least one AAV ITR.
- the gene construct of the invention is flanked by AAV ITRs.
- Inverted terminal repeats ITR are typically present in at least two copies in the AAV vector, typically flanking the gene construct of the invention.
- the ITRs will typically be at the 5 'and 3 'of the gene construct of the invention but do not need to be contiguous with it.
- the terminal repetitions may be the same or different from each other.
- terminal repeat includes any viral terminal repeat and / or partially or completely synthetic sequences that form hairpin structures and function as inverted terminal repeats, such as the "double D sequence" described in US Patent No.
- a "AAV terminal repeat” may be of any AAV, including but not limited to serotypes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 or any other AAV known now or discovered later.
- the terminal repeat of AAV does not need to have a wild sequence (for example, a wild sequence can be altered by insertion, deletion, truncation or nonsense mutations), as long as the terminal repetition mediates the desired functions, for example, replication, cutting, packaging of virus, integration, and / or rescue of provirus, and the like.
- the genome of the vector may comprise one or more (for example, two) terminal AAV repeats, which may be the same or different.
- one or more AAV terminal repeats may be of the same AAV serotype as the AAV capsid, or it may be different.
- the vector genome comprises a terminal repeat of AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8, AAV9, AAV10, AAV11 and / or AAV12, in particular AAV1, AAV2 and / or AAV4.
- the ITRs can be derived from AAV2 and can be defined by SEQ.ID.NO.:9 (5'-ITR) and SEQ.ID.NO .: 10 (3'-ITR).
- the invention also contemplates AAV genomes that further comprise a sequence encoding one or more capsid proteins. which packages the polynucleotide sequence mentioned above.
- the sequences encoding capsid proteins VP1, VP2 and VP3 for use in the context of the present invention can be derived from any of the 42 known serotypes, more preferably AAV1, AAV2, AAV3, AAV4, AAV5, AAV6, AAV7, AAV8 or AAV9 or newly developed AAV-like particles obtained by, for example, capsid mixing techniques and AAV capsid libraries.
- the AAV genome is known as the "hybrid" AAV genome (ie, in which the AAV capsid and the AAV terminal repeats are from different AAVs) as described in international patent publication WO 00/28004 and Chao et al., (Molecular Therapy 2000, 2: 619).
- the rAAV vector can be any suitable rAAV vector known now or discovered later.
- the sequences encoding the capsid genes can be provided in trans by cotransfection in the packaging cell of a polynucleotide encoding said capsid proteins.
- the viral vector comprises ITR of AAV1, AAV2 and / or AAV4 and one or more or all of the capsid genes of AAV1, AAV2, AAV5, AAV6 or AAV8.
- the AAV genomes of the invention may comprise additional sequences encoding Rep proteins.
- the sequences encoding Rep (Rep78 / 68 and Rep52 / 40) are preferably derived from AAV1, AAV2 and / or AAV4.
- the AAV Rep and ITR sequences are particularly conserved among most serotypes.
- Rep78 proteins of several AAV serotypes are, for example, more than 89% identical and the total nucleotide sequence identity at genome level between AAV2, AAV3A, AAV3B and AAV6 is about 82% (Bantel-Schaal et al, 1999, J. Viral., 73: 939-947).
- AAV VP proteins determine the cell tropism of the AAV virion.
- the sequences encoding VP proteins are significantly less conserved than Rep proteins and genes between different AAV serotypes.
- the ability of the Rep and ITR sequences to trans-complement the corresponding sequences of other serotypes allows the production of pseudotyped rAAV particles comprising the capsid proteins of a serotype (e.g., AAV5) and the Rep and / or ITR sequences of another AAV serotype (for example, AAV2).
- pseudotyped rAAV particles are part of the present invention.
- the invention in another aspect, relates to a virion obtainable by expressing a viral genome according to the present invention in a suitable packaging cell.
- virion obtainable by expressing a viral genome according to the present invention in a suitable packaging cell.
- infectious virus particle deficient in replication
- the virion is an AAV virion.
- the virion of the invention is a "recombinant AAV virion”.
- rAAV virion refers to an infectious, replication-deficient virus composed of an AAV protein shell encapsidating a polynucleotide comprising the gene construct of the invention flanked on both. ends by AAV ITRs.
- Cap protein refers to a polypeptide that has at least one functional activity of a AAV native Cap protein (eg, VP1, VP2, VP3).
- AAV native Cap protein eg., VP1, VP2, VP3
- functional activities of Cap proteins include the ability to induce the formation of a capsid, facilitate the accumulation of single-stranded DNA, facilitate the packaging of AAV DNA into capsids (i.e. encapsidation) , binding to cellular receptors, and facilitating virion entry into host cells.
- the polynucleotide sequence encoding the cap gene corresponds to the AAV8 cap gene.
- the framework of an AAV virion shows icosahedral symmetry and usually contains a main Cap protein, usually the smallest of the Cap protein, and one or two minor Cap proteins or proteins.
- Rep protein refers to a polypeptide that has at least one functional activity of a AAV native Rep protein (eg, Rep 40, 52, 68, 78).
- a "functional activity" of a Rep protein is any activity associated with the physiological function of the protein, including facilitating DNA replication by recognizing, binding and cutting off the origin of AAV DNA replication as well as DNA helicase activity. Additional functions include the transcription modulation of AAV promoters (or other heterologous) and site-specific integration of AAV DNA into a host chromosome.
- the polynucleotide sequence encoding the rep gene corresponds to the AAV2 rep gene.
- the AAV virions of the invention can comprise capsid proteins of any AAV serotype.
- AAV virions will contain a capsid protein that is more suitable for distribution to liver cells.
- rAAV virions with capsid proteins of AAV1, AAV8 and AAV5 are preferred (Nathwani et al., 2007, Blood 109: 1414-1421; Kitajima et al, 2006, Atherosclerosis 186: 65-73) .
- sequences encoding Rep may be of any AAV serotype, but preferably derived from AAV1, AAV2 and / or AAV4. Sequences encoding the capsid proteins VP1, VP2 and VP3 for use in the context of the present invention can however be taken from any of the 42 known serotypes, more preferably from AAV1, AAV2, AAV5, AAV6 or AAV8.
- the invention also contemplates virions comprising a capsid and a recombinant viral genome, in which an exogenous targeting sequence has been inserted or replaced in the native capsid.
- the virion is preferably directed (ie, directed to a particular type or types of cell) by replacing or inserting the exogenous targeting sequence in the capsid.
- the exogenous targeting sequence preferably confers an altered tropism to the virion.
- the targeting sequence increases the distribution efficiency of the vector directed to a cell.
- the exogenous addressing sequence (s) may change or replace part or all of a subunit of the capsid, alternatively, more than one subunit of the capsid.
- more than one exogenous targeting sequence can be introduced into the virion capsid.
- insertions and substitutions in the minor subunits of the capsid are preferred.
- insertions or substitutions in VP2 and VP3 are also preferred.
- the exogenous targeting sequence may be an amino acid sequence encoding a peptide or protein, which is inserted or replaced in the virion capsid to change the virion tropism.
- the tropism of the native virion can be reduced or eliminated by insertion or substitution of the amino acid sequence.
- the insertion or substitution of the exogenous amino acid sequence can direct the virion to a particular cell type.
- the exogenous targeting sequence can be any amino acid sequence that encodes a protein or peptide that changes the tropism of the virion.
- the targeting peptide or protein may be natural or, alternatively, completely or partially synthetic.
- Exemplary peptides and proteins include ligands and other peptides that bind to cell surface receptors present in liver cells include ligands capable of binding to the Sr-Bl receptor for apolipoprotein E, galactose and lactose specific lectins, lipoprotein receptor ligands of low density, asialoglycoprotein (galactose-terminal) ligands and the like.
- the exogenous targeting sequence may be an antibody or an antigen recognition group thereof.
- antibody refers to all types of immunoglobulins, including IgG, IgM, IgA, IgD, and IgE.
- the antibodies can be monoclonal or polyclonal and can be of any species of origin, including (for example) mouse, rat, council, horse, or human, or they can be chimeric antibodies.
- the term “antibody” also encompasses bispecific or "bridging” antibodies known to those skilled in the art.
- the Antibody fragments within the scope of the present invention include, for example, Fab, F (ab ') 2 and Fe fragments, and corresponding fragments obtained from antibodies other than IgG. Such fragments can be produced by known techniques.
- Surface hepatic markers that can be used for addressing the rAAVs of the invention include, without limitation, the hepatitis B virus and LDL surface antigen.
- the exogenous amino acid sequence inserted into the virion capsid may be one that facilitates the purification or detection of the virion. According to this aspect of the invention, it is not necessary that the exogenous amino acid sequence also change the modified parvovirus virion.
- the exogenous amino acid sequence may include a poly-histidine sequence that is useful for purifying the virion on a nickel column, as those skilled in the art know or an antigenic peptide or protein can be used to purify the virion by standard immunopurification techniques.
- the amino acid sequence can encode a receptor ligand or any other peptide or protein that can be used to purify the modified virion by affinity purification or any other method known in the art (for example purification techniques based on size, density , charge, or differential isoelectric point, ion exchange chromatography, or peptide chromatography). Insertions of exogenous targeting or purification sequences can be inserted into any capsid protein as long as the insertion does not imply the ability of said protein to assemble. In particular, it is preferable to insert the exogenous amino acid sequence into the minor Cap subunits of the AAV, for example in the VP1 and VP2 subunits of AAV. Alternatively, it is possible to insert in VP2 or VP3.
- Preferred AAV virions can be modified to reduce the host response (see, for example, Russell (2000, J. Gen. Viral. 81: 2573-2604), US20080008690 and Zaldumbide and Hoeben (Gene Therapy, 2008: 239-246 ).
- Recombinant virions of the invention can be prepared using standard technology for the preparation of AAV.
- rAAVs are prepared by introduction into a suitable host cell of the viral genome according to the invention and co-expression in said AAV rep protein cell, an AAV cap protein and, optionally, a nucleic acid sequence encoding viral and / or cellular functions on which AAV depends for replication.
- the genome of the recombinant vector is generally about 80% to about 105% the size of the wild genome and comprises a suitable packaging signal.
- the genome is preferably about 5.2 kb in size or less. In other embodiments, the genome is preferably greater than about 3.6, 3.8, 4.0, 4.2 or 4.4 kb in length and / or less than about 5.4, 5.2 , 5.0 or 4.8 kb in length.
- the heterologous nucleotide sequence (s) will typically be less than about 5.0 kb in length (more preferably less than about 4.8 kb, still more preferably less than about 4.4 kb in length, even more preferably less than about 4.2 kb in length) to facilitate the packaging of the recombinant genome by the AAV capsid.
- nucleic acid sequences necessary for the production of the virion of the invention are the so-called "AAV auxiliary functions" and comprise one, or both of the main AAV ORFs, that is the regions encoding rep and cap, or functional homologs of the same.
- Suitable nucleic acid sequences encoding the rep and cap proteins for use in the method of the invention have been described in detail above in relation to the virions of the invention.
- the person skilled in the art will appreciate, however, that the auxiliary sequences encoding the AAV rep and cap proteins can be provided from one, two or more vectors in various combinations.
- the term "vector” includes any genetic element, such as a plasmid, phage, transposon, cosmid, chromosome, artificial chromosome, virus, virion, etc., which is capable of replication when associated with the elements of adequate control and that can transfer gene sequences between cells.
- the term includes cloning and expression vehicles, as well as viral vectors.
- AAV rep and / or cap genes may alternatively be provided by a packaging cell that expresses these genes stably (see, for example, Gao et al, (1998) Human Gene Therapy 9: 2353; Inoue et al, (1998) J. Viral. 72: 7024; U.S. Patent No. 5837484; WO 98 / 27207; U.S. Patent No. 5658785; WO 96/17947).
- the polynucleotides encoding the rep and cap proteins can be provided from a single individual vector, which is normally referred to as an AAV auxiliary function vector.
- AAV auxiliary function vector examples include pHLP19, described in US Pat. No. 6001650, and the vector pRep6cap6, described in US Pat. No. 6156303, the disclosure of which is incorporated herein by reference in its entirety.
- the additional sequences are in the form of an auxiliary adenovirus virus that can be a hybrid auxiliary virus encoding the Rep and / or AAV capsid proteins.
- Ad / AAV helper hybrid vectors expressing AAV rep and / or cap genes and methods for producing AAV stores using these reagents are known in the art (see, for example, US Patent No. 5589377; and U.S. Patent No. 5871982, U.S. Patent No. 6251677; and U.S. Patent No. 6387368).
- the hybrid Ad of the invention expresses the AAV capsid proteins (ie, VP1, VP2 and VP3).
- the hybrid adenovirus can express one or more of the AAV Rep proteins (i.e. Rep40, Rep52, Rep68 and / or Rep78).
- AAV sequences may be operatively associated with a tissue specific or inducible promoter.
- the optional component for the generation of recombinant virions may comprise a nucleic acid sequence encoding viral functions not derived from AAV and / or cellular on which AAV depends on replication (ie, "accessory functions").
- Accessory functions include those functions required for AAV replication, including, without limitation, those groups involved in the activation of AAV gene transcription, support of phase-specific AAV mRNA, AAV DNA replication, product synthesis of cap expression, and AAV capsid assembly.
- Accessory virus-based functions may be derived from any of the known auxiliary viruses such as adenovirus, herpesvirus (other than herpes simplex virus type 1), and vaccine virus.
- the AAV vector packaging plasmid according to the invention contains as auxiliary virus DNA sequences the E2A, E4 and VA genes of Ad5, which may be derived from the plasmid pDG described in German patent application DE196 44 500.0-41, and which are controlled by the respective original promoter or by heterologous promoters.
- the expression of the structural components of the AAVs and their contact with the viral genome of the invention is possible so that encapsidation takes place in vitro.
- any suitable host cell type can be used.
- insect cells are used as described by Urabe et al, (Hum. Gene Ther. 2002, 13: 1935-1943; US6723551 and US20040197895).
- Cell lines suitable for the expression of the structural components of rAAVs include, without limitation, the Spodoptera frugiperda cell lines, Drosophila cell lines, or mosquito cell lines, for example, cell lines derived from Aedes albopictus.
- Preferred insect cells or cell lines are from insect species that are susceptible to baculovirus infection, including, for example, Se301, SeIZD2109, SeUCRl, Sf9, Sf900 +, Sf21, BTI-TN-5B1-4, MG-I, Tn368, HzAmI, Ha2302, Hz2E5, High Five (Invitrogen, CA, USA) and expresSF + ® (US 6,103,526; Protein Sciences Corp., CT, USA).
- the virions of the invention have been assembled, it is possible to purify them to separate them from those components that have not become part of the virions.
- the virions are separated from the other components by a density gradient, typically a iodixanol gradient.
- chromatography which may be an ion exchange or hydroxyapatite chromatography. This type of purification is preferred for Purification of virions that have capsids containing AAV serotype 1 and 5 proteins because these serotypes do not bind heparin columns.
- heparin-agarose chromatography is preferred. See, for example, US Pat. No. 6146874.
- Virions are also purified using chromatography in the absence of density gradient centrifugation.
- the lysates of infected cells can be directly subjected to chromatography for purification of rAAV virions.
- chromatography For large-scale production methods of rAAV vectors that involve chromatography, see Potter et al. (Methods Enzymol, 2002, 346: 413-430).
- Recombinant virions can be used or an additional affinity purification step of the virion vectors can be included using an anti-AAV antibody, preferably an immobilized antibody.
- the anti-AAV antibody is preferably a monoclonal antibody.
- a particularly suitable antibody is a single chain camelid antibody or a fragment thereof, obtainable, for example, from camels or llamas (see, for example, Muyldermans, 2001, Biotechnol. 74: 277-302).
- the antibody for rAAV affinity purification is preferably an antibody that specifically binds to an epitope of an AAV capsid protein, wherein the epitope is preferably an epitope that is present in capsid proteins of more than one serotype. of AAV.
- the antibody can be produced or selected based on the specific binding to the AAV2 capsid but at the same time it can also specifically bind the AAV1, AAV3 and AAV5 capsids.
- the invention relates to an in vitro method for expression in a liver-derived cell of a polynucleotide of interest comprising the steps of (i) contacting said cell with a gene construct of the invention, with a vector of the invention, with a viral genome of the invention or with a virion of the invention under conditions suitable for entry into the cell of said construct, of said vector or of said virion and
- Hepatic cells in which a polynucleotide of interest can be expressed using the in vitro method of the present invention include not only cells from primary hepatocyte cultures, but immortalized cells of hepatic origin such as Hepoma2 Hepatoma cell lines, COLO 587 , FaO, HTC, HuH-6, HuH-7, PLC, Hep3B, BPRCL, MCA-RH777, BEL-7404, SMMC-7221, L-02, CYNK-1, PLC / PRF / 5 and MCA-RH8994, as well as lines immortalized experimentally by the expression of viral or cellular oncogenes, such as the Fa2N-4 and EalC-35 line cells.
- immortalized cells of hepatic origin such as Hepoma2 Hepatoma cell lines, COLO 587 , FaO, HTC, HuH-6, HuH-7, PLC, Hep3B, BPRCL, MCA-RH777, BEL-7404, SMMC-7221,
- the in vitro expression method according to the invention comprises a first stage in which the cell of hepatic origin is contacted with a gene construct, a vector, a viral genome or with a virion of the invention under conditions suitable for the entry into the cell of said construction, said vector or said virion.
- Suitable methods for promoting the entry of a nucleic acid into a cell include, without limitation, direct injection of naked DNA, ballistic methods, liposome-mediated transfer, receptor-mediated transfer (ligand-DNA complex), electroporation, and precipitation. with calcium phosphate (see, for example, US 4970154, WO 96/40958, US 5679559, US 5676954 and US 5593875).
- the entry into the cell of the genetic material takes place thanks to the intrinsic ability of the virions to bind to the surface of the liver cell and to release the genetic material in their inside.
- the use of rAAV in which the capsid proteins belong to serotypes AAV1, AAV8 and AAV5 as previously described (Nathwani et al, 2007, Blood 109: 1414-1421; Kitajima et al, 2006, Atherosclerosis 186: 65-73).
- the cells that contain the gene construct of the invention within them are contacted with an inducing agent, so that transcription of both the transactivator and the polynucleotide of interest is activated.
- an inducing agent as well as the adequate incubation time of the cells with said inducing agent should be determined experimentally.
- the determination of the expression of the polynucleotide of interest in response to the inducing agent can be determined using techniques known to a person skilled in the art for the determination of mRNA levels in a sample (RT-PCR, Northern blot and the like) or for the determination of protein levels (ELISA, Western blot, RIA and the like)
- the invention relates to a pharmaceutical preparation comprising a therapeutically effective amount of a gene construct of the invention, of a vector of the invention, of a virion of the invention and a carrier (carrier) or excipient. pharmaceutically acceptable.
- the invention relates to a gene construct of the invention, a vector of the invention or a virion of the invention for use in medicine.
- compositions of the invention may be administered by any route, including, but not limited to, oral, intravenous, intramuscular, intrarterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteric, topical, sublingual or rectal.
- routes including, but not limited to, oral, intravenous, intramuscular, intrarterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteric, topical, sublingual or rectal.
- compositions comprising said vehicles can be formulated by conventional procedures known in the state of the art.
- nucleic acids polynucleotides of the invention, vectors, gene constructs or viral vectors
- the invention contemplates pharmaceutical compositions specially prepared for the administration of said nucleic acids.
- the pharmaceutical compositions can comprise said nucleic acids in a naked form, that is, in the absence of compounds that protect nucleic acids from their degradation by the body's nucleases, which entails the advantage that the toxicity associated with the reagents used is eliminated for transfection.
- Suitable routes of administration for naked compounds include intravascular, intratumoral, intracranial, intraperitoneal, intrasplenic, intramuscular, subretinal, subcutaneous, mucosa, topical and oral (Templeton, 2002, DNA Cell Biol, 21: 857-867).
- nucleic acids can be administered as part of liposomes, cholesterol-conjugated or conjugated to compounds capable of promoting translocation through cell membranes such as the Tat peptide derived from HIV-1 TAT protein, the third helix of homeodomain of the Antennapedia protein of D.melanogaster, the VP22 protein of the herpes simplex virus, arginine oligomers and peptides such as those described in WO07069090 (Lindgren, A. et al., 2000, Trends Pharmacol. Sci, 21: 99-103 , Schwarze, SR et al., 2000, Trends Pharmacol. Sci., 21: 45-48, Lundberg, M et al, 2003, Mol.
- compounds capable of promoting translocation through cell membranes such as the Tat peptide derived from HIV-1 TAT protein, the third helix of homeodomain of the Antennapedia protein of D.melanogaster, the VP22 protein of the herpes simplex virus,
- virions are administered, the amount of these and the administration time will depend on the circumstances and should be optimized in each case by the person skilled in the art using standard technology.
- the administration of therapeutically effective amounts of virions of the invention is possible by a single administration, such as, for example, a single injection of a sufficient number of infectious particles to provide therapeutic benefit to the patient undergoing such treatment.
- the number of infectious particles administered to a mammal may be of the order of about 10 7 , 10 8 , 10 9 , 10 10 , 10 11 , 10 12 , 10 13 , or even greater, infectious particles / ml given as a single dose, or divided into two or more administrations as may be required to achieve the therapy of the particular disease or disorder to be treated.
- compositions and polynucleotides of the invention are administered by the so-called “hydrodynamic administration” as described by Liu, F., et al, (Gene Ther, 1999, 6: 1258-66).
- the compounds are introduced into the body intravascularly at high speed and volume, resulting in high levels of transfection with a more diffuse distribution. It has been shown that the effectiveness of intracellular access depends directly on the volume of fluid administered and the speed of injection (Liu et al, 1999, Science, 305: 1437-1441).
- mice In mice, administration has been optimized in values of lml / 10 g of body weight in a period of 3-5 seconds (Hodges et al, 2003, Exp.Opin.Biol.Ther, 3: 91-918).
- the exact mechanism that allows cell transfection in vivo with polynucleotides after hydrodynamic administration is not fully known.
- administration by the tail vein takes place at a rate that exceeds the heart rate, which causes the administered fluid to accumulate in the superior vena cava. This fluid subsequently accesses the vessels in the organs and, subsequently, through fenestrations in said vessels, accesses the extravascular space.
- the polynucleotide comes into contact with the cells of the target organ before it mixes with the blood thus reducing the chances of degradation by nucleases.
- compositions of the invention can be administered in doses of less than 10 mg per kilogram of body weight, preferably less than 5, 2, 1, 0.5, 0.1, 0.05, 0.01, 0.005, 0.001, 0.0005, 0.0001, 0.00005 or 0.00001 mg per kg of body weight and less than 200 nmol of AN agent, that is, around 4.4 x 10 16 copies per kg of body weight or less than 1500, 750, 300, 150, 75, 15, 7.5, 1.5, 0.75, 0.15 or 0.075 nmol per kg of body weight.
- the unit dose can be administered by injection, by inhalation or by topical administration.
- AAV virions are administered, they can be administered systemically since, thanks to their tropism by liver cells, they will access this organ.
- the gene constructs of the invention or the plasmids of the invention are administered, they should preferably be administered in a directed manner to the liver by administration in the hepatic artery or by other hepatic administration systems known in the prior art such as those described by Wen et al, (World J. Gastroenterol, 2004, 10, 244-9), Murao et al, (Pharm. Res., 2002, 19, 1808-14), Lin et al , (Gene Ther., 2003, 10, 180-7), Hong et al, (, J. Pharm.
- compositions can be administered at doses between 0.00001 mg to 3 mg, preferably between 0.0001 and 0.001 mg, even more preferably around 0.03 and 3.0 mg per organ, around 0.1 and 3.0 mg per organ. or between 0.3 and 3.0 mg per organ.
- the dose to be administered of the compositions of the invention depends on the severity and response of the condition to be treated and may vary between several days and several months or until it is observed that the condition remits.
- the optimal dosage can be determined by periodic measurements of the agent concentrations in the patient's organism.
- the optimal dose can be determined from the EC50 values obtained by previous tests in vitro or in vivo in animal models.
- the unit dose can be administered once a day or less than once a day, preferably, less than once every 2, 4, 8 or 30 days.
- the maintenance regimen may involve treating the patient with doses ranging from 0.01 ⁇ g to 1.4 mg / kg body weight per day, for example 10, 1, 0.1, 0.01, 0.001, or 0, 00001 mg per kg body weight per day.
- Maintenance doses are preferably administered at most once every 5, 10 or 30 days.
- the treatment should be continued for a time that will vary according to the type of alteration suffered by the patient, its severity and the patient's condition. After treatment, the evolution of the patient should be monitored to determine if the dose should be increased in case the disease does not respond to the treatment or the dose is decreased if an improvement in the disease is observed or if unwanted side effects are observed.
- the daily dose can be administered in a single dose or in two or more doses depending on the particular circumstances. If repeated administration or frequent administrations is desired, it is advisable to implant an administration device such as a pump, a semi-permanent catheter (intravenous, intraperitoneal, intracisternal or intracapsular) or a reservoir.
- the therapeutic uses of the gene constructs of the invention contemplate a second stage of administration.
- inducing agent can be administered in the form of prodrug, salt, solvate or clathrate, either in isolation or in combination with additional active agents.
- Preferred excipients for use in the present invention include sugars, starches, celluloses, gums and proteins.
- Inducing agents can be administered as formulated in a pharmaceutical form of solid administration (e.g.
- the invention relates to a gene construct of the invention, a vector of the invention, a viral genome of the invention, a virion of the invention or a pharmaceutical composition of the invention for use. in the treatment of liver disease.
- the invention relates to the use of a gene construct of the invention, of a vector of the invention, of a viral genome of the invention, of a virion of the invention or of a pharmaceutical composition of the invention for the manufacture of a medication for use in the treatment of liver disease.
- the invention relates to a method for the treatment of a liver disease comprising the administration to an individual in need of a gene construct of the invention, of a vector of the invention, of a viral genome of the invention, of a virion of the invention or a pharmaceutical composition of the invention.
- treatment refers to the act of reversing, improving or inhibiting the evolution of the disorder or condition for which such term is applied, or one or more symptoms of such disorder or condition.
- prevention refers to the act of preventing the occurrence, re-existence, or alternatively delaying the onset or recurrence of a disease, disorder or condition for which such term is applied, or one or more of the symptoms associated with a disease, disorder or condition.
- CD134 Immunotherapy adjuvant
- CD137 Immunotherapy adjuvant
- PBGD Acute intermittent porcine p 17 (TGF- ⁇ inhibitor) Adjuvant in colon cancer
- Table 1 Polynucleotides of interest that can be incorporated into the gene constructs of the invention and disorders in which they can be used.
- the polynucleotide of interest encodes IL-12 or a functionally equivalent variant in which case the gene construct of the invention, a vector of the invention, the viral genome of the invention or the virion of the invention or the Pharmaceutical composition of the invention are employed for the treatment of liver cancer.
- liver cancer refers to both primary and secondary cancer including that formed from any type of primary tumor.
- liver cancer includes, without limitation, hepatocellular carcinoma (sometimes called hepatoma or HCC), carcinoma, fibrolamellar HCC, cholangiocarcinoma, hemangioma, hepatic adenoma, nodular focal hyperplasia, angiosarcoma and hepatoblastoma.
- HCC hepatocellular carcinoma
- carcinoma sometimes called hepatoma or HCC
- fibrolamellar HCC cholangiocarcinoma
- hemangioma hemangioma
- hepatic adenoma nodular focal hyperplasia
- nodular focal hyperplasia angiosarcoma
- hepatoblastoma hepatoblastoma
- bidirectional hepatospecific promoter does not necessarily have to be part of a gene construct that additionally comprises a transcriptional activator and a polynucleotide of interest but can be used in isolation as an integral element of other vectors , viral genomes or gene constructs.
- the invention relates to a bidirectional inducible operator-promoter suitable for hepatospecific expression and inducible by an inducer of two polynucleotides of interest comprising
- first and second hepato-specific promoter sequence act divergently with respect to the response element to the inducing agent and where the promoter activity of the first and second hepato-specific promoter sequence is increased in the presence of a transactivator that after administration of the inducing agent binds to the response element.
- the elements that form the bidirectional inducible operator specifically, the response element to the transactivator in its active form, the first hepato-specific promoter sequence and the second hepato-specific promoter sequence have been described in detail previously and are interpreted in the same way as described above in relation to the gene construct of the invention.
- the adjustable bidirectional operator-promoter comprises at least one transactivator + tetracycline response element.
- the tetracycline response element comprises a nucleic acid sequence defined in SEQ.ID.NO .: l.
- first hepato-specific promoter sequence and the second hepato-specific promoter sequence are the same.
- the first hepato-specific promoter sequence and the second hepato-specific promoter sequence comprise the albumin gene promoter or a functionally equivalent variant thereof.
- the albumin gene promoter comprises a sequence selected from the group of SEQ.ID.NO.:2 and SEQ.ID.NO.:3.
- the bidirectional inducible operator-promoter comprises SEQ.ID.NO .: 4.
- the invention relates to a gene construct suitable for hepatospecific expression and inducible by a polynucleotide inducing agent of interest comprising
- first and second hepato-specific promoter sequence act divergently with respect to the response element to the inducing agent and wherein the promoter activity of the first and second hepato-specific promoter sequence is increased in the presence of said inducing agent and in the presence of a transactivator that binds to the response element in the bidirectional inducible operator-promoter.
- the elements that form the bidirectional inducible operator in particular, the response element to the inducing agent, the type of transactivator, the first hepatospecific promoter sequence, the second hepatospecific promoter sequence and the polyadenylation signal have been described in detail previously and interpreted in the same manner as described above in relation to the first gene construct of the invention.
- the adjustable bidirectional operator-promoter comprises at least one tetracycline response element.
- the tetracycline response element comprises a nucleic acid sequence defined in SEQ.ID.NO .:! .
- the transactivator is a tetracycline-dependent reverse transactivator.
- the rtTA reverse tetracycline activatable transactivator is rtTA-M2.
- first hepatospecific promoter sequence and the second hepatospecific promoter sequence are the same.
- first hepato-specific promoter sequence and the second hepato-specific promoter sequence comprise the albumin gene promoter or a functionally equivalent variant thereof.
- the albumin gene promoter comprises a sequence selected from the group of SEQ.ID.NO .: 2 and SEQ.ID.NO.:3.
- the bidirectional inducible operator-promoter comprises SEQ.ID.NO .: 4.
- the polyadenylation signal is a bidirectional polyadenylation signal. In an even more preferred embodiment, the polyadenylation signal is a bidirectional polyadenylation signal of the SV40 virus.
- the second gene construct of the invention can be provided in isolation or, preferably, can be provided as part of a vector to facilitate its propagation and manipulation.
- the vector further comprises and in a 3 'position with respect to the second hepatospecific promoter sequence one or more sites that allows the cloning of polynucleotides of interest so that they can be expressed in a hepatospecific form in response to the Addition of the activating agent.
- the cloning sites are grouped together forming a multiple cloning site as it frequently appears in cloning vectors.
- multiple cloning site refers to a nucleic acid sequence comprising a series of two or more target sequences for restriction endonucleases close to each other. Multiple cloning sites include targets for restriction endonucleases that allow the insertion of fragments that show blunt ends, protruding 5 'ends or 3 'protruding ends.
- the insertion of polynucleotides of interest is carried out using standard molecular bilogy methods as described, for example, by Sambrook et al (supra.)
- Example 1 C o n s t r u c c i o n and c a r a cterization of the recombinant virus rAAV-pTetbidi-pCMV-luc.
- the main objective was to obtain an inducible vector based on AAV8 that allowed to regulate the expression of the transgene over time, varying the dose of inducer administered, and that directed the expression of the transgene specifically to hepatocytes, thus acting at the target site of our therapy, and avoiding possible toxic adverse effects of the transgene.
- AAV8 mostly transduces the liver with high efficiency, we wanted to find out if the rAAV-pTetbidi-pCMV-luc system complied with the characteristics explained above when administered intravenously through the tail vein.
- the luciferase gene was used as a reporter gene, which allowed the biodistribution of the expression of the transgene to be analyzed in vivo, in addition to allowing its quantification.
- the eGFP gene present in the plasmid kindly provided by Dr. Lilianne Tenenbaum of the University of Brussels Free, was replaced by the firefly luciferase gene, to obtain the rAAV-pTetbidi-pCMV-luc system ( Figure 2. A) with which we produced the rAAV2 / 8-pTetb ⁇ di- pCMV-luc virions.
- the plasmid containing the AAV recombinant genome with the inducible pTetbidi-pCMV-luc system (pAClM2-pCMV-luc) was generated as follows: the luciferase gene was amplified from the plasmid pAlb-luc (Kramer G. et al. Molecular Therapy 2003, 7: 375-385) with primers A (sense primer) and B (antisense primer) (A: GTC GA C AT G GAA GA C GCC AAA AAC (SEQ.ID.NO.
- rAAV2 / 8 virions were produced by transfection with PEI in HEK 293T cells for which the following protocol was followed:
- the PEI-DNA complexes were prepared in the following manner: a) Preparation of the DNA solution: A DNA solution was prepared with the appropriate amount of plasmids p5F6 (40 ⁇ g / plate), p518 (20 ⁇ g / plate) and the one that contained the corresponding recombinant AAV-2 genome (20 ⁇ g / plate), in saline solution or sterile physiological serum, in a final volume of 1 ml per plate. It was mixed and incubated for 5 min at room temperature. Plasmid characteristics are described at the end of the protocol.
- PEI concentration 10 mM.
- the volume of calculated PEI was mixed and incubated for 5 min at T. amb. c) After the 5 minutes, the PEI solution on the DNA was added and vigorously stirred with vortex for 15 seconds, after which it was incubated for 30 minutes at room temperature to allow the formation and stabilization of the PEI- complexes.
- the medium was removed to the cells, and mechanically peeled off, using scraper (Costar, Corning). Each plate was washed with 3 ml of clean DMEM medium and collected in 50 ml Falcon tube. The cells were centrifuged at 1800 rpm for 5 minutes, and the supernatant was discarded. The total cells were resuspended in 18.5 ml of clean DMEM medium and frozen at -80 ° C for later purification. To release the virus produced inside the 293T cells, 3 successive freezing and thawing steps were performed at -80 ° C and 37 ° C, respectively. It was then centrifuged at 3000 rpm and 4 ° C for 5 minutes to remove cell debris. The supernatant was incubated with 0.1 mg per plate of DNAse I and RNAse A (Roche) for 30 minutes at 37 ° C and filtered using filters of a pore size of 0.22 ⁇ (MILLIPORE).
- plasmid p5F6 was kindly assigned by the company AMT (Amsterdam Molecular Therapeutics). It contains the adenovirus genes necessary for the viral replication of an AAV
- plasmid p518 was kindly ceded by the company AMT (Amsterdam Molecular Therapeutics). It contains the genes that encode the Rep proteins of the AAV-2 serotype and the VP proteins of the serotype 8.
- the iodixanol gradient ultracentrifugation method was used to purify the adeno-associated vectors.
- fresh 7.4X PBS-MK buffer 500 ml PBS without Mg 2+ and without Ca 2+ + 50 ml of 1M MgCl 2 + 125 ml 1M KC1 was prepared.
- Table 2 summarizes the preparation of the phases of the gradient used.
- Table 2 Composition of the gradient phases used for purification of AAVs The total volumes of each phase prepared depend on the amount of purifications to be performed on each occasion.
- the AAV particles concentrated at the 40% - 60% interface of iodixanol were collected by pricking the bottom of the tube with a 5 ml needle and syringe.
- the 5 ml obtained, enriched in viral particles (fraction 1) were washed and concentrated in PBS + 5% sucrose, using centricon (Amicon Ultra-15, Centrifugal Filter Devices-MILLIPORE).
- centricon Amicon Ultra-15, Centrifugal Filter Devices-MILLIPORE
- the amount of washings and the centrifugation times vary in each production, and were performed until the absence of iodixanol's own viscosity was observed.
- the virus was concentrated in 1 ml of 5% sucrose PBS, and stored at -80 ° C until use. The recovery percentage was approximately 94%.
- mice were anesthetized with ketamine / xylazine and administered intraperitoneally, 100 ⁇ of D-luciferin (Xenogen / Alameda, USA) diluted in PBS a a concentration of 30 mg / ml.
- Luciferase activity measurements are made by delimiting an area of interest chosen by the user.
- the levels of total luciferase activity are significantly higher than the levels obtained by measuring only the upper abdominal or hepatic area both in the basal state and in the induced, and throughout the induction period, indicating that the transgene is expressed considerably in organs other than the liver, as is also observed in bioluminescence images captured by the CCD camera, which are not shown to have an impossible color code of interpreting in grayscale.
- the basal or residual activity of the system is dependent on the dose of virus administered.
- the background noise of the bioluminescence chamber for the selected area is approximately 1 x 10 5
- the basal luciferase activity in the liver area is relatively low in all three cases, being very close to the background noise with The lowest dose of virus used.
- Luciferase activity of the liver area was measured, 24 hours post induction. Comparing the levels of luciferase activity in the induced state, a linear response is observed with respect to the dose of dox administered ( Figure 5), but this linearity is lost when the dose of 200mg / kg of dox is reached. Upon reaching this point, several mice died and the rest were sacrificed, as they showed symptoms of toxicity mediated by dox (fever, abdominal adhesions, etc). These symptoms were also observed in control mice, without vector. The maximum induction rate of the system is reached at a dose of 100 mg / kg of dox, and is approximately 10 times.
- mice of both strains and sexes 4-8 mice were induced per group (who had been infected 21 days earlier with lx 10 11 gv / mouse of rAAV2 / 8 with the corresponding induction system), with 50 mg / Kg of dox ip
- the activity of luciferase was determined in vivo in the CCD chamber and subsequently, the animals were sacrificed and several of its organs were removed, freezing them immediately to then measure the luciferase activity of each of them and normalize it by the amount of total protein.
- the rAAV-pTetbidi-pCMV-luc virus designed is not suitable for regulating transgenic expression in the liver, since its maximum induction rate is reduced (approximately 10), and the biodistribution of the transgene activity is not restricted mainly to the liver, but is dispersed by various organs of the animal.
- Example 2 Construction and characterization of the recombinant virus rAAV-pTetbidi-pAlb-luc.
- the plasmid containing the AAV recombinant genome with the pTetbidi-pAlb-luc inducible system (pAClM2-pAlb-luc) was generated as follows: the fragment containing the 7 tetracycline response operator sites was amplified and the promoter of albumin (Tet07-pAlb) from the plasmid pTonL2 (T) -mIL12 generated in our department (Zabala, M., et al., Cancer Res.
- albumin promoter was amplified from plasmid pAlb-luc (Kramer G. et al. Molecular Therapy 2003, 7: 375-385) with primers E (sense) and F (antisense) (E: AGC GCT ACA GCT CCA GAT GGC AAA (SEQ.ID.NO .: 15); F: AGC GCT GAA TTC TTA GTG GGG TTG ATA GGA AAG (SEQ.ID.NO .: 16)) containing at its 5 'ends, Afel sites (sense primer) and Afel sites, and EcoRI (antisense primer).
- This fragment was subcloned into the cloning vector pCDNA3.1 / V5-His TOPO TA (Invitrogen) and was named: pCDNA3.
- 1-pAlb He Albumin promoter was extracted from this vector by digestion with Afel, and inserted into the plasmid: pCDNA3.1-Tet07-pAlb, digested with the same enzyme. Plasmids were selected whose digestion with EcoRI / SalI resulted in a band of approximately 700 bp, corresponding to the pAlb-Tet07-pAlb fragment. This digestion fragment was inserted into the plasmid pAClM2-pCMV-luc digested with the same enzymes, obtaining plasmid pAClM2-pAlb-luc.
- a dose of rAAV2 / 8-pTetb ⁇ di-pAlb-luc virus of 11 gv / mouse was injected into 4 female BALB / c mice intravenously, and baseline activity was measured (at 14 days post intravenous injection of the vector) as induced (24 hours post ip administration of 50 mg / kg of dox, and day 22 post administration of the vector) of luciferase in the liver area and in the total animal.
- This dose of dox ip was chosen to be sure not to induce unwanted toxic effects due to an excessive inducer dose.
- FIG 9.B the logarithmic values of the luciferase activities observed in Figure 9 are shown.
- A which fit a sigmoid curve typical of saturable systems, which allow us to estimate luciferase activity at a given inducer dose within the linear range of each curve (2 to 25 mg / kg of dox for males, and 10 to 50 mg / kg for females).
- the rAAV-pTetbidi-pAlb-luc system is the first inducible and hepato-specific system described for adeno-associated vectors (hepato-specific inducible systems vehiculized by hydrodynamic injection have already been described (Zabala, M., et al, Cancer Res. 2004; 64: 2799-2804), and by adeno high capacity virus (Wang, L., et al. Gastro lo gy, 2004.
- liver diseases that require strict regulation of transgene expression, either by presenting a limited therapeutic range (as in the case of IGF-1 in liver cirrhosis models), such as for presenting toxic effects when expressed uncontrollably (as in the case of several immunopotentiating cytokines such as IL-12, IFNy, IFNa, etc.).
- Example 3 Construction and characterization of the recombinant rAAV-pTet bidi- pAlb-IL12 virus.
- the AAV represents a very promising candidate, since it is a long-term vector and its production in clinical grade and in high doses had already been verified (Meghrous, J., et al Biotechnol Prog. 2005, 21: 154-160).
- the single-chain mIL-12 (mIL-12 se), formed by the p40 and p35 subunits fused into a single protein sequence, was used.
- the mIL-12 has a size much smaller than the construction that is usually used to express the IL-12, which consists of the P35 subunit, an IRES element ("Internal Ribosomal Entry Site") and the P40 subunit ( Waehler, R., et al. Hum Gene Ther, 2005, 16: 307-317). This allows subcloning it into the viral skeleton of the rAAV and generating the corresponding recombinant virus.
- IRES element Internal Ribosomal Entry Site
- the mIL12sc was amplified by PCR from plasmid pCDNA3.1-mIL12sc (kindly ceded by Dr. Crettaz of our department The construction and sequence of the mIL12sc are detailed in Lieschke, GJ, et al. (Nat. Biotechnol.
- the liver metastasis model of colorectal cancer will be used by implanting MC38 cells in the liver of syngeneic C57BL / 6 mice.
- the procedure used consists of hepatic implantation (by laprarotomy) of 500,000 MC38 cells in the major lobe of the liver). Seven days after liver implantation of the cells, tumors 4-6 mm in diameter are detected (by laparotomy), which grow continuously until the death of the mouse occurs around 30-50 days post-implantation.
- IL-12 As an antitumor agent
- serum transaminase levels AST: aspartate aminotransferase
- ALT alanine aminotransferase
- the first way to measure the antitumor efficacy of the treatment was to determine the survival percentage of the different groups of mice over time.
- the experiment on day 132 of the protocol, corresponding to day 102 postimplantation of the tumor cells was terminated ( Figure 13).
- the mice that were alive today had no intrahepatic tumors, however, all animals that died during the study had large tumors (approximately 4 cm 3 ). No mortality was observed due to the expression of IL-12. All control mice and those injected with the lowest dose of the virus died, although in the latter a slight delay in tumor growth is observed.
- Figure 15 shows shows that the minimum dose of therapeutic rAAV2 / 8-pTet b -di-pAlb-mIL12 virus was 10 x 10 gv / mouse, obtaining 100% of tumor-free mice.
- the dose of 3 x 10 10 gv / mouse produced a percentage of 80% of tumor-free mice.
- FIG. 16 shows the tumor progression over time of previously treated mice, compared to 5 untreated, control mice. Protection is observed in 40% of the previously treated mice, while the tumor size at the end of the experiment (day 42 post reject and day 132 of the protocol) is significantly lower in the treated groups, than in the untreated mice.
- the inducible rAAV-pTetbidi-pAlb system coding for single chain mIL 12 constitutes a good antitumor treatment for hepatic metastases of colorectal carcinoma, with the absence of toxic effects associated with the expression of IL-12, and the Development of an effective cellular response.
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EP10795406A EP2497830A1 (en) | 2009-11-05 | 2010-11-04 | Regulated expression systems |
RU2012123145/10A RU2012123145A (ru) | 2009-11-05 | 2010-11-04 | Генный конструкт (варианты), вектор и рекомбинантный вирусный геном на его основе, вирион, их фармацевтическая композиция, способ in vitro экспрессии полинуклеотида в клетке печеночной природы, лекарственное средство, способ лечения заболевания печени (варианты), индуцируемый двунаправленный оператор-промотор |
US13/508,494 US20120225933A1 (en) | 2009-11-05 | 2010-11-04 | Regulated expression systems |
AU2010316996A AU2010316996A1 (en) | 2009-11-05 | 2010-11-04 | Regulated expression systems |
BR112012010755A BR112012010755A2 (pt) | 2009-11-05 | 2010-11-04 | constructo de gene que permite a expressão hepato-específica induzível de um polinucleotídeo de interesse em resposta a um agente indutor, vetor, genoma viral recombinante, vírion, método in vitro para a expressão de um polinucleotídeo de interesse em uma célula de origem hepática, composição farmacêutica e operador-promotor bi-direcional induzível adequado para a expressão hepato-específica induzível de dois polinucleotídeos de interesse por um agente indutor |
CA2780671A CA2780671A1 (en) | 2009-11-05 | 2010-11-04 | Regulated expression system |
CN201080060595XA CN102712933A (zh) | 2009-11-05 | 2010-11-04 | 调控的表达系统 |
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