CN108728463A - A kind of minicircle dna carrier and its preparation method and application of expression IgG antibody - Google Patents

A kind of minicircle dna carrier and its preparation method and application of expression IgG antibody Download PDF

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CN108728463A
CN108728463A CN201710244846.3A CN201710244846A CN108728463A CN 108728463 A CN108728463 A CN 108728463A CN 201710244846 A CN201710244846 A CN 201710244846A CN 108728463 A CN108728463 A CN 108728463A
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carrier
igg antibody
recombination
ser
antibody
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谢亦武
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Shenzhen New Connaught Micro Ring Biological Technology Co Ltd
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    • C07ORGANIC CHEMISTRY
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    • C07K16/00Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/08Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses
    • C07K16/10Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
    • C07K16/1036Retroviridae, e.g. leukemia viruses
    • C07K16/1045Lentiviridae, e.g. HIV, FIV, SIV
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    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K39/00Medicinal preparations containing antigens or antibodies
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    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K2317/00Immunoglobulins specific features
    • C07K2317/50Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K2317/00Immunoglobulins specific features
    • C07K2317/70Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76Antagonist effect on antigen, e.g. neutralization or inhibition of binding

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Abstract

This application involves a kind of minicircle dna carriers and its preparation method and application of expression IgG antibody.More particularly to a kind of minicircle dna carrier for the complete IgG antibody of expressive function in vivo.In the IgG antibody and human immunodeficiency virus (HIV), other pathogen antigens or cancer cell antigen.The minicircle dna carrier, IgG antibody can be used in preventing or treating the illnesss such as AIDS (or HIV infection), other pathogenic infections or cancer.

Description

A kind of minicircle dna carrier and its preparation method and application of expression IgG antibody
Technical field
The invention belongs to biomedicine fields, are related to a kind of recombination carrier, and in particular to one kind is for table in vivo Up to the minicircle dna carrier of fully functional IgG antibody.
Background technology
Monoclonal antibody drug from the last century 80's approval listing since, be transfused in vivo after combine, in and/or remove Specific internal antigen, including cell factor, cell membrane surface receptors and pathogen antigen etc..Monoclonal antibody medicine is widely used in exempting from The prevention and treatment of the diseases such as epidemic disease correlation, cancer and infectious disease, achieve extraordinary clinical effectiveness.
Lethal sexually transmitted disease caused by AIDS is mainly infected by human immunodeficiency virus (HIV), in the world It has been widely current.The inverase clinically applied at present, is aided with highly active antiretroviral therapy, can be to a certain degree The upper life span for extending HIV infection person and its quality of life of improvement.But since HIV vaccine progress is slow and resistance to Pharmacological property problem is increasingly apparent, and it is still the task of top priority to research and develop novel inverase.
The present invention is endogenous using human or animal by the minicircle dna carrier to internal infusion gene order containing IgG antibody Albumen synthesis mechanism directly produces antibody protein drug in vivo, achievees the effect that prevent and treat disease.With most phase of the invention Close technical solution includes:With AAV (adeno-associated virus) carrier expression HIV neutralizing antibodies AAV-anti-HIV (WO2012115980), or by cell culture technology in vitro expression and purification HIV and albumen or other IgG antibodies.
However, there are disadvantages, including with high costs, safety risks for existing AAV expression antibody technique.It specifically includes: (a) packaging, purification process of AAV viral vectors are complicated, need a large amount of cell culture, take time and effort;(b) preservation of AAV viruses, The processes such as transport need low temperature environment, cause cost increase inconvenient for use;(c) AAV virus coats are easy to evoke strong be immunized Reaction, and the DNA sequence dna radom insertion carried in carrier is easy to cause gene mutation or even carcinogenic risk.
Likewise, passing through cell culture expression and purification HIV antibody or mainly cost the shortcomings that other IgG antibodies in vitro It is high, it is inconvenient for use.It specifically includes:(a) antibody in vitro expression and purification complex process, it is costly;(b) albumen is preserved, is transported Usually require low temperature environment, it is desirable that harsher;(c) antibody use need to be needed for a long time by vein or hypodermic injection, limited half-life It uses, increases patient burden.
The present invention is directed to be expressed by building recombination carrier (especially minicircle dna), and using recombination carrier HIV neutralizing antibodies (MC.anti-HIV), to play a dual role of to aids prevention and treatment.Meanwhile the present invention is to it The prevention and treatment of its pathogenic infection, cancer, autoimmune disease or other illnesss provide feasibility and operable Reference and technical teaching.
Invention content
The present invention relates to a kind of minicircle dna carriers (MC.IgG) for the complete IgG antibody of expressive function in vivo, use In Binding in vivo, in and/or remove specific antigen and its associated cell or pathogen.
It is in the IgG antibody and anti-the present invention provides a kind of recombination carrier of the complete IgG antibody of expressive function Original, the antigen are selected from human immunodeficiency virus (HIV) or other antigens, and other antigens are selected from other pathogen, cancer Cell or in vivo other antigens.In in other respects, other antigens are further selected from and the relevant antigen of autoimmune disease.
In one embodiment, it is preferred to, the recombination carrier is selected from non-viral gene vector;It is furthermore preferred that The recombination carrier is selected from minicircle dna carrier.
In one embodiment, the recombination carrier is recombinant expression carrier, selected from prokaryotic expression carrier or very Nuclear expression carrier.It is preferred that carrier for expression of eukaryon, is more preferably used for the recombinant expression carrier of mammalian cell eukaryotic expression.
In one embodiment, the IgG antibody includes:Such as SEQ ID NO:The heavy chain of amino acid sequence shown in 1 can Become area VH, and such as SEQ ID NO:The light chain variable region VL of amino acid sequence shown in 2.Preferably, the IgG antibody includes:Such as SEQ ID NO:The heavy chain of amino acid sequence shown in 3, and such as SEQ ID NO:The light chain of amino acid sequence shown in 4.
In one embodiment, the heavy chain variable region VH that the IgG antibody includes has and SEQ ID NO:Sequence shown in 1 The row at least amino acid sequence with 90%, 95%, 98% or 99% homology, including light chain variable region VL have and SEQ ID NO:At least amino acid sequence with 90%, 95%, 98% or 99% homology of sequence shown in 2.
In one embodiment, the heavy chain that the IgG antibody includes has and SEQ ID NO:Sequence shown in 3 at least has Have the amino acid sequence of 90%, 95%, 98% or 99% homology, including light chain variable region VL have and SEQ ID NO:2 The shown sequence at least amino acid sequence with 90%, 95%, 98% or 99% homology.
The present invention provides a kind of recombination carrier of the complete IgG antibody of expressive function, the recombination carrier Include the encoding gene of the IgG antibody.
In one embodiment, the nucleotide sequence of encoding gene such as SEQ ID described in the recombination carrier NO:Shown in 3.
In one embodiment, encoding gene described in the recombination carrier has and SEQ ID NO:Shown in 3 The sequence at least nucleotide sequence with 90%, 95%, 98% or 99% homology.It is well known to those skilled in the art, do not changing In the case of becoming encoded amino acid, the justice such as one or more of described coding gene sequence codon can carry out are replaced It changes, such as one or several codons, such as 1,2,3,4,5,6,8,9,10,15,20,30,40,50 codon.
The present invention provides the IgG antibodies expressed by a kind of recombination carrier by before described in embodiment.It is excellent Choosing, the recombination carrier is selected from non-viral gene vector;It is furthermore preferred that the recombination carrier is selected from minicircle dna Carrier.
The present invention provides a kind of preparation methods of recombination carrier described in embodiment before, including walk as follows Suddenly:
(1) sequence of the IgG antibody and its heavy chain variable region and light chain variable region that neutralize antigen is obtained;
(2) the recombination carrier of structure expression IgG antibody;
Optional, (3) identify the expression of IgG antibody in vivo and in vitro, and detect in corresponding antigen and/or clear Except effect;
Wherein, the antigen is selected from human immunodeficiency virus (HIV) or other antigens, other antigens and other senses The illnesss such as dye, cancer or autoimmune disease are related.
In one embodiment, in the step (1) of the preparation method, (a) obtains HIV from the prior art The sequence of the heavy chain variable region and light chain variable region of neutralizing antibody or other IgG antibodies;Or (b) the separation HIV antibody positive is suffered from HIV specificity neutralizing monoclonal antibody in person's serum or other IgG antibodies are then sequenced the variable region of the antibody.
The present invention provides a kind of host cells, including the recombination carrier described in embodiment before, or by it The obtained recombination carrier of preparation method described in preceding embodiment.
In one embodiment, the host cell includes bacterial cell, yeast cell, mammalian cell or elder brother Worm cell.
The present invention provides a kind of preparation method of IgG antibody described in embodiment before, specific steps include:
(1) the recombination carrier is built;
(2) by the recombination vector introduction host cell;
(3) under conditions suitable for the expression, host cell is cultivated, expression isolates and purifies, obtains the IgG antibody.
The present invention provides a kind of pharmaceutical compositions, including before recombination carrier described in embodiment or before IgG antibody described in embodiment and pharmaceutically acceptable carrier.
In one embodiment, pharmaceutical preparation can be made in described pharmaceutical composition according to conventional methods.In production process, It is preferred that recombination carrier or antibody are mixed with pharmaceutically acceptable carrier or diluted with carrier.When carrier is as diluent When, can be solid, semisolid or liquid.Preparation is selected from tablet, pill, pulvis, capsule, elixir, suspension, emulsion, molten The forms such as liquor, aerosol, capsule, injection solution.Suitable carrier, excipient or diluent include water, lactose, grape Sugar, sucrose, sorbierite, mannitol, calcium silicates, cellulose, polyvinylpyrrolidone, methyl hydroxybenzoate, hydroxybenzoic acid Propyl ester, talcum powder, magnesium stearate and mineral oil etc..Preparation can also include filler, anticoagulant, lubricant, wetting agent, tune Taste agent, emulsifier, preservative etc..
The present invention provides recombination carrier described in embodiment before, the IgG antibody, the host is thin Born of the same parents or the pharmaceutical composition are preparing the application in preventing or treating the drug of illness, and the illness is selected from AIDS, HIV Infection, other pathogenic infections, cancer or Other diseases.In in other respects, the illness further includes autoimmune disease.
In one embodiment, the pathogenic infection includes virus, bacterium, fungi, parasite, mycoplasma or other Infectious diseases caused by pathogen.Preferably, the virus infection includes hepatitis virus (hepatitis A, hepatitis B, hepatitis etc.), influenza Virus infection caused by virus, Epstein-Barr virus, rhinovirus, adenovirus, coronavirus, rotavirus, herpesviral or other viruses Property disease.Preferably, the bacterium infection includes Escherichia coli, micrococcus scarlatinae, diplococcus, streptococcus pneumonia, gold Staphylococcus aureus, klebsiella pneumoniae, haemophilus influenzae, pseudomonas aeruginosa, comma bacillus, typhoid bacillus, pylorus Bacterium caused by helicobacter, mycobacterium tuberculosis, clostridium tetani, yersinia pestis, Bacillus anthracis or other bacteriums Infectious diseases.Preferably, the parasitic infection includes amoeba worm, roundworm, hookworm, tapeworm, blood fluke, toxoplasma, silk Parasite infectivity disease caused by worm, plasmodium, acarid or other parasites.
In one embodiment, the cancer is selected from lung cancer, non-small cell lung cancer, the cancer of the esophagus, gastric cancer, liver cancer, gall-bladder Cancer, cancer of pancreas, carcinoma of small intestine, colorectal cancer, kidney, carcinoma of urinary bladder, prostate cancer, oophoroma, cervix cancer, carcinoma of endometrium, Head and neck cancer, nasopharyngeal carcinoma, hypopharyngeal cancer, cancer eye, osteocarcinoma, sarcoma, the cancer of the brain, glioma, astrocytoma, leukaemia, lymthoma, Cutaneum carcinoma, melanoma or other cancers.
In one embodiment, the autoimmune disease include rheumatoid arthritis, it is systemic loupus erythematosus, hard Skin disease, ulcerative colitis, multiple sclerosis or other.
The present invention provides a kind of recombination carriers for the complete IgG antibody of expressive function in vivo, especially Minicircle dna carrier, has the advantage that:
(a) the minicircle dna carrier is utilized, ensures that the light chain of IgG antibody, heavy chain molar ratio are 1 in same expression cassette: 1, and ensure that finally formed antibody is consistent or similar in sequence and function to natural antibody.The company of IgG antibody light chain, heavy chain Connect mode, light chain, heavy chain molar ratio 1:It, could the most effective antibody for being formed with biological function when 1.
(b) compared with prior art, especially AAV carriers express neutralizing antibody, cell culture technology vivoexpression antibody Compare, safety of the invention is more preferable, and cost is cheaper, carrier and antibody it is more convenient to use.
Description of the drawings
Fig. 1:The structure chart of minicircle dna carrier anti-HIV IgG1 (3BNC117).
Specific implementation mode
Following experimental methods are conventional method unless otherwise instructed, used experiment material unless otherwise instructed, It can easily be obtained from commercial company.
The structure of embodiment 1, AntiHIV1 RT activity IgG antibody (Anti-HIV IgG antibodies)
(a) Anti-HIV IgG antibodies are built, in the IgG antibody and human immunodeficiency virus (HIV).
(b) IgG antibody includes, such as SEQ ID NO:The heavy chain variable region VH of amino acid sequence shown in 1, and such as SEQ ID NO:The light chain variable region VL of amino acid sequence shown in 2.
(c) the minicircle dna carrier of structure expression Anti-HIV IgG antibodies, includes the encoding gene of the IgG antibody;And And also comprising suitable Expression element in minicircle dna carrier.
(d) include the expression cassette (shown in Figure 1) of Anti-HIV IgG antibodies, including following formula knot in minicircle dna carrier Structure:
Kozak-SP-AA-HIV.VH-CH1-hinge-CH2-CH3-Furin-GSG-T2A-SP-AA-HIV.VL- HIV.CL-His6
Wherein, Kozak is Kozak sequences, and SP is signal peptide (Signal Peptide);Hinge is antibody hinge region; Furin is furin protease cleavages, 2A expression 2A self cleavages site.
SP can be Secrecon, and amino acid sequence is:MWWRLWWLLLLLLLLWPMVWA or other;Furin is sheared The amino acid sequence in site is R-X- [R/K]-R (such as RRKR), and X refers to any amino acid;2A include E2A, F2A, P2A and T2A etc., the wherein amino acid sequence of T2A are EGRGSLLTCGDVEENPGP.
The nucleotide sequence of above-mentioned expression cassette such as SEQ ID NO:Shown in 5.
The preparation of embodiment 2, the structure of minicircle dna carrier and micro-loop (MC)
(a) encoding gene of IgG antibody is synthesized.
(b) suitable site double digestion minicircle dna empty carrier pMC.BESPX is selected.
(c) seamless clones or conventional cloning methods (digestion-connection) is used to be inserted into the encoding gene of IgG antibody In empty carrier pMC.BESPX after double digestion, it is built into IgG antibody minicircle dna carrier (pMC.IgG antibody).
(d) pMC.IgG antibody converts Escherichia coli E coli.ZYCY10P3S2T, is obtained by standard micro-loop preparation method micro- Ring (MC.IgG antibody)
Wherein, minicircle dna empty carrier pMC.BESPX, engineering bacteria E coli.ZYCY10P3S2T and micro-loop preparation method See document Nat Biotechnol.2010,28 (12):1287-9.
The expression and purifying of embodiment 3, Anti-HIV IgG antibodies
One, expression of the IgG antibody in 293T cells
Above-mentioned minicircle dna is transfected by 293T cells using superfect plasmid transfections kit (Invitrogen companies), 293T cell supernatants are collected respectively after being cultivated three days in serum free medium, and Anti-HIV is detected using Western Blot The expression of IgG antibody albumen.
Two, IgG antibody purifies
293 cell culture supernatants are first subjected to low-temperature centrifugation or in-depth filtration, take supernatant, then using Protein A parents And chromatographic purifying, albumen after purification use Western Blot qualitative detections, and it is dense using ELISA method quantitative detection of protein Degree.Purified product is placed in -20 DEG C or less long-term preservations.
Without departing from the spirit of the invention, those skilled in the art combine known technology, can be done to the present invention Go out many modifications, such modification also falls into the scope of the present invention.
Sequence table
SEQUENCE LISTING
<110>Shenzhen Xin Nuo micro-loops bio tech ltd
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ttcgacacct acagcttcta catggacctg aaggccctga ggagcgacga taccgccgtg 360
tacttttgcg ccaggcagcg gagcgactat tgggacttcg acgtctgggg aagcggaaca 420
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gacaagaagg tggagcccaa gtcttgcccc aaatcttgtg acaaaactca cacatgccca 780
ccgtgcccag cacctgaact cctgggggga ccgtcagtct tcctcttccc cccaaaaccc 840
aaggacaccc tcatgatctc ccggacccct gaggtcacat gcgtggtggt ggacgtgagc 900
cacgaagacc ctgaggtcaa gttcaactgg tacgtggacg gcgtggaggt gcataatgcc 960
aagacaaagc cgcgggagga gcagtacaac agcacgtacc gtgtggtcag cgtcctcacc 1020
gtcctgcacc aggactggct gaatggcaag gagtacaagt gcaaggtctc caacaaagcc 1080
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gtgtacaccc tgcccccatc ccgggatgag ctgaccaaga accaggtcag cctgacctgc 1200
ctggtcaaag gcttctatcc cagcgacatc gccgtggagt gggagagcaa tgggcagccg 1260
gagaacaact acaagaccac gcctcccgtg ctggactccg acggctcctt cttcctctac 1320
agcaagctca ccgtggacaa gagcaggtgg cagcagggga acgtcttctc atgctccgtg 1380
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cggagaaaga gaggcagcgg cgagggaaga ggatctctgc tgacatgcgg cgacgtggaa 1500
gagaatccag gacctatgtg gtggcgcctg tggtggctgc tgctgctgct gctgctgctg 1560
tggcccatgg tgtgggccgc cgccgatatc cagatgaccc agagccctag ctctctgagc 1620
gctagcgtgg gcgatacagt gaccatcact tgccaggcca acggctacct gaattggtac 1680
cagcagaggc ggggcaaggc tcctaagctg ctgatctacg acggctccaa gctggagagg 1740
ggcgtgccca gcagattcag cggaagacgc tggggccagg agtacaatct gaccatcaac 1800
aacctgcagc ccgaggacat cgccacctac ttttgccagg tgtacgagtt cgtggtgcca 1860
ggaaccaggc tggatctgaa gagaaccgtg gccgctccta gcgtgttcat cttccctccc 1920
agcgacgagc agctgaagtc aggaacagcc agcgtcgtgt gtctgctcaa caacttctac 1980
cccagggagg ccaaggtcca gtggaaagtg gacaacgccc tgcagagcgg aaactctcag 2040
gagagcgtga ccgagcagga cagcaaggac agcacctaca gcctgagcag cacactgacc 2100
ctgagcaagg ccgactacga gaagcacaag gtgtacgctt gcgaggtcac acaccaggga 2160
ctgtctagcc cagtgaccaa gagcttcaac cgaggcgagt gc 2202

Claims (10)

1. a kind of recombination carrier of the complete IgG antibody of expressive function, which is characterized in that in the IgG antibody and antigen, The antigen is selected from human immunodeficiency virus (HIV) or other antigens, and other antigens are selected from other pathogen, cancer cell Or internal other antigens;Preferably, the recombination carrier is selected from non-viral gene vector;It is furthermore preferred that the recombination base Because carrier is selected from minicircle dna carrier.
2. recombination carrier as described in claim 1, which is characterized in that the IgG antibody includes, such as SEQ ID NO:1 The heavy chain variable region VH of shown amino acid sequence, and such as SEQ ID NO:The light chain variable region VL of amino acid sequence shown in 2.
3. recombination carrier as claimed in claim 1 or 2, which is characterized in that the recombination carrier includes the IgG The encoding gene of antibody.
4. recombination carrier as claimed in claim 3, which is characterized in that the nucleotide sequence of the encoding gene such as SEQ ID NO:Shown in 5.
5. the IgG antibody expressed by recombination carrier as described in any one of claim 1-4.
6. such as the preparation method of 1-4 any one of them recombination carriers in claim, which is characterized in that including walking as follows Suddenly:
(1) sequence of the IgG antibody and its heavy chain variable region and light chain variable region that neutralize antigen is obtained;
(2) the recombination carrier of structure expression IgG antibody;
Optional, (3) identify the expression of IgG antibody in vivo and in vitro, and detect to be directed in corresponding antigen and/or remove and make With;
Wherein, the antigen is selected from human immunodeficiency virus (HIV) or other antigens, and other antigens are selected from other cause of diseases Body, cancer cell or internal other antigens.
7. preparation method as claimed in claim 6, which is characterized in that in the step (1), (a) is obtained from the prior art Take the heavy chain variable region of HIV neutralizing antibodies or other IgG antibodies and the sequence of light chain variable region;Or (b) separation HIV antibody is positive Property patients serum in HIV specificity neutralizing monoclonal antibody or other IgG antibodies, then to the variable region of the antibody survey Sequence.
8. a kind of host cell, which is characterized in that comprising the recombination carrier as described in any one of claim 1-4, or The obtained recombination carrier of preparation method as claimed in claims 6 or 7.
9. a kind of pharmaceutical composition, which is characterized in that comprising as described in any one of 1-4 recombination carrier or as right is wanted Seek the IgG antibody and pharmaceutically acceptable carrier described in 5.
10. the recombination carrier as described in any one of claim 1-4, IgG antibody as claimed in claim 5 are such as weighed Profit requires host cell described in 8 or pharmaceutical composition as claimed in claim 9 to prevent or the drug for the treatment of illness preparing In application, the illness be selected from AIDS, HIV infection, other pathogenic infections, cancer, autoimmune disease or other Illness.
CN201710244846.3A 2017-04-14 2017-04-14 A kind of minicircle dna carrier and its preparation method and application of expression IgG antibody Pending CN108728463A (en)

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Application publication date: 20181102