WO2016015675A1 - 抗ctla4的单克隆抗体或其抗原结合片段、药物组合物及用途 - Google Patents

抗ctla4的单克隆抗体或其抗原结合片段、药物组合物及用途 Download PDF

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WO2016015675A1
WO2016015675A1 PCT/CN2015/085721 CN2015085721W WO2016015675A1 WO 2016015675 A1 WO2016015675 A1 WO 2016015675A1 CN 2015085721 W CN2015085721 W CN 2015085721W WO 2016015675 A1 WO2016015675 A1 WO 2016015675A1
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seq
antibody
ctla4
antigen
monoclonal antibody
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English (en)
French (fr)
Chinese (zh)
Inventor
李百勇
夏瑜
王忠民
张鹏
庞醒华
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Akeso Pharmaceuticals Inc
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Akeso Biopharma Inc
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Priority to AP2017009762A priority Critical patent/AP2017009762A0/en
Priority to UAA201701943A priority patent/UA119570C2/uk
Priority to DK15827441.5T priority patent/DK3176181T3/da
Priority to PH1/2017/500190A priority patent/PH12017500190B1/en
Priority to MA40474A priority patent/MA40474B1/fr
Priority to TN2017000010A priority patent/TN2017000010A1/en
Priority to KR1020177005688A priority patent/KR102017396B1/ko
Priority to PL15827441T priority patent/PL3176181T3/pl
Priority to MYPI2017000162A priority patent/MY192822A/en
Priority to CN202211206595.7A priority patent/CN115960232A/zh
Priority to EP20216429.9A priority patent/EP3858861A1/en
Priority to US15/500,744 priority patent/US10449251B2/en
Priority to HRP20210448TT priority patent/HRP20210448T1/hr
Priority to RS20210312A priority patent/RS61590B1/sr
Priority to CA2956000A priority patent/CA2956000C/en
Priority to AU2015295936A priority patent/AU2015295936C1/en
Priority to MX2017001446A priority patent/MX387685B/es
Priority to EA201790288A priority patent/EA036396B1/ru
Priority to CN201580040171.XA priority patent/CN106687479B/zh
Priority to LTEP15827441.5T priority patent/LT3176181T/lt
Priority to JP2017525666A priority patent/JP6514774B2/ja
Priority to ES15827441T priority patent/ES2857509T3/es
Priority to EP15827441.5A priority patent/EP3176181B1/en
Priority to SI201531555T priority patent/SI3176181T1/sl
Priority to MDA20170022A priority patent/MD4795C1/ro
Application filed by Akeso Biopharma Inc filed Critical Akeso Biopharma Inc
Priority to NZ729158A priority patent/NZ729158A/en
Priority to BR112017002080-7A priority patent/BR112017002080B1/pt
Priority to SG11201700819QA priority patent/SG11201700819QA/en
Priority to CR20170033A priority patent/CR20170033A/es
Publication of WO2016015675A1 publication Critical patent/WO2016015675A1/zh
Priority to ZA2017/00528A priority patent/ZA201700528B/en
Priority to IL250321A priority patent/IL250321B/en
Priority to CONC2017/0000754A priority patent/CO2017000754A2/es
Anticipated expiration legal-status Critical
Priority to AU2018247270A priority patent/AU2018247270A1/en
Priority to US16/562,236 priority patent/US11291720B2/en
Priority to CY20211100197T priority patent/CY1124190T1/el
Priority to US17/695,592 priority patent/US12447208B2/en
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    • C07K16/2818—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against CD28 or CD152
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    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
    • G01N33/57492—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites involving compounds localized on the membrane of tumor or cancer cells
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    • G01N33/577—Immunoassay; Biospecific binding assay; Materials therefor involving monoclonal antibodies binding reaction mechanisms characterised by the use of monoclonal antibodies; monoclonal antibodies per se are classified with their corresponding antigens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K39/00—Medicinal preparations containing antigens or antibodies
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    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
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    • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
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    • G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
    • G01N2333/70503—Immunoglobulin superfamily, e.g. VCAMs, PECAM, LFA-3
    • G01N2333/70521—CD28, CD152

Definitions

  • the present invention relates to the field of tumor therapy and molecular immunology, and relates to monoclonal antibodies against CTLA4 or antigen-binding fragments thereof, pharmaceutical compositions thereof, sequences encoding the same, and methods of using the same for diagnosis, prevention, treatment and/or adjuvant therapy And use.
  • the cytotoxic T lymphocyte sociated antigen 4 (also referred to as CTLA4) has a close relationship with the CD28 molecule in gene structure, chromosomal location, sequence homology and gene expression.
  • the receptor for molecular B7 is mainly expressed on the surface of activated T cells.
  • CTLA4 and CD28 molecules have opposite functions.
  • CTLA4 binds to B7 and inhibits the activation of mouse and human T cells, and plays a negative regulatory role in T cell activation.
  • CTLA4 mAb or CTLA4 ligand can prevent CTLA4 from binding to its natural ligand, thereby blocking CTLA4's negative regulation of T cell signaling and enhancing the reactivity of T cells to various antigens.
  • CTLA4 mAb (10D1, 11.2.2) is currently in clinical trials for the treatment of prostate cancer, bladder cancer, colorectal cancer, gastrointestinal cancer, liver cancer, malignant melanoma, etc. (Grosso JF., Jure-Kunkel MN. , CTLA-4 blockade in tumor models: an overview of preclinical and translational research. Cancer Immun. 2013; 13: 5. Epub 2013 Jan 22; US 6984720 B1 and US 6682736 B1), where 10D1 and 11.2.2 are considered current One of the most effective CTLA4 monoclonal antibodies.
  • Interleukin 2 is produced by T cells, is a growth factor that regulates T cell subsets, is also an important factor regulating immune response, and can promote the proliferation of activated B cells, participate in antibody response, hematopoiesis and tumor surveillance.
  • Recombinant human IL-2 has been approved by the US FDA for the treatment of malignant tumors (including melanoma, kidney tumors, etc.) while ongoing treatment Clinical study of chronic viral infection (Chavez, A.R., et al., Pharmacologic administration of interleukin-2. Ann N Y Acad Sci, 2009.1182: p. 14-27).
  • CTLA4 and CTLA4 mAbs are important factors influencing the function of T cells. By interfering with the immune microenvironment of the body, they can produce specific therapeutic effects on diseases, and exert high therapeutic effects, supplementing the deficiency of traditional drugs, thus opening up new ways of gene therapy. .
  • CTLA4 and CTLA4 mAbs are used in various stages of testing and clinical practice: such as effective inhibition of airway hyperresponsiveness in animal models of asthma, prevention of development of rheumatic diseases, and mediation of immune tolerance in allogeneic transplantation in autoimmune diseases Wait.
  • the present inventors used a mammalian cell expression system to express recombinant CTLA4 as an antigen to immunize mice, and obtained hybridoma cells by fusion of mouse spleen cells with myeloma cells.
  • the inventors obtained a screening of a large number of samples to obtain a specific monoclonal antibody capable of secreting specific binding to CTLA4, and the monoclonal antibody was able to block the binding of CTLA4 and B7 very effectively. Further, humanized antibodies were prepared. The following invention is thus provided:
  • One aspect of the invention relates to a monoclonal antibody or antigen-binding fragment thereof, wherein
  • the monoclonal antibody comprises a complementarity determining region (CDR) selected from the group consisting of:
  • An HCDR2 comprising the amino acid sequence of SEQ ID NO: 28, and
  • An HCDR3 comprising the amino acid sequence of SEQ ID NO: 29;
  • An LCDR1 comprising the amino acid sequence of SEQ ID NO: 30,
  • An LCDR2 comprising the amino acid sequence of SEQ ID NO: 31, and
  • An LCDR3 comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 32, SEQ ID NO: 33, and SEQ ID NO: 34.
  • the amino acid sequence of the heavy chain variable region (VH) of the monoclonal antibody is selected from the group consisting of SEQ ID NO: 6, SEQ ID NO: 10, SEQ ID NO: 14 and SEQ ID NO: 18.
  • the amino acid sequence of the light chain variable region (VL) of the monoclonal antibody is selected from the group consisting of SEQ ID NO: 8, SEQ ID NO: 12, SEQ ID NO: 16, SEQ ID NO: 20, SEQ ID NO: 22, and SEQ ID NO: 24.
  • the monoclonal antibodies include:
  • VH as shown in SEQ ID NO: 6 and VL as shown in SEQ ID NO: 8;
  • VH as shown in SEQ ID NO: 10 and VL as shown in SEQ ID NO: 12;
  • the above monoclonal antibodies of the (1)-(6) group are the amino acid sequences of the heavy chain variable region and the light chain variable region of 8D2/8D2 (Re), 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17, respectively.
  • the methionine (Met) at position 18 in SEQ ID NO: 6, SEQ ID NO: 10, SEQ ID NO: 14 is independently replaced with an amino acid selected from the group consisting of:
  • Leucine Leu
  • valine Val
  • isoleucine Ile
  • alpha isoleucine
  • Al alanine
  • Antibody therapeutics particularly monoclonal antibodies (MABs) have achieved good results in the treatment of a variety of diseases.
  • Traditional experimental methods for obtaining these therapeutic antibodies are to immunize animals with antigens, to obtain antibodies that target antigens in immunized animals, or to improve antibodies that have lower affinity for antigens by affinity maturation.
  • these methods require a lot of time and effort, and most of the time they do not target specific epitopes on the antigen.
  • variable regions of the light and heavy chains determine the binding of the antigen; the variable regions of each chain contain three hypervariable regions, called complementarity determining regions (CDRs) (the CDRs of the heavy chain (H) comprise HCDR1, HCDR2, HCDR3
  • CDRs of the light chain (L) comprise LCDR1, LCDR2, LCDR3; which is named by Kabat et al., Sequences of Proteins of Immunological Interest, Fifth Edition (1991), Vol. 1-3, NIH Publication 91-3242, Bethesda Md ).
  • amino acid sequences of the CDR regions of the monoclonal antibody sequences in the above items (1) to (6) are analyzed by technical means well known to those skilled in the art, for example, by the VBASE2 database, and the results are as follows:
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLRSPFT (SEQ ID NO: 32)
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLRSPFT (SEQ ID NO: 32)
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLRSPFT (SEQ ID NO: 32)
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLRSPFT (SEQ ID NO: 32)
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLSRHPG (SEQ ID NO: 33)
  • amino acid sequences of the three CDR regions of the heavy chain variable region are as follows:
  • HCDR1 GFTFSDNW (SEQ ID NO: 27)
  • HCDR2 IRNKPYNYET (SEQ ID NO: 28)
  • HCDR3 TAQFAY (SEQ ID NO: 29)
  • amino acid sequences of the three CDR regions of the light chain variable region are as follows:
  • LCDR1 ENIYGG (SEQ ID NO: 30)
  • LCDR2 GAT (SEQ ID NO: 31)
  • LCDR3 QNVLSSRPG (SEQ ID NO: 34)
  • the monoclonal antibody or antigen-binding fragment thereof according to any of the preceding claims, wherein the monoclonal antibody or antigen-binding fragment thereof is selected from the group consisting of Fab, Fab', F(ab') 2 , Fd, Fv, dAb, A complementarity determining region fragment, a single chain antibody (eg, scFv), a humanized antibody, a chimeric antibody, or a diabody.
  • the monoclonal antibody or antigen-binding fragment thereof according to any of the preceding claims, wherein said monoclonal antibody is less than about 10 -5 M, such as less than about 10 -6 M, 10 -7 M, 10 -8 K D , 10 -9 M or 10 -10 M or less binds to the CTLA4 protein.
  • the monoclonal antibody comprises a non-CDR region and the non-CDR region is from a species other than a murine, such as from a human antibody.
  • the monoclonal antibody or antigen-binding fragment thereof of the present invention is a monoclonal antibody against CTLA4 or an antigen-binding fragment thereof, which is capable of specifically binding to CTLA4.
  • the monoclonal antibody or antigen-binding fragment thereof for use in the prevention and/or treatment and/or adjuvant treatment and/or diagnosis of a tumor; in particular, the tumor is selected from the group consisting of melanoma, renal tumor , prostate cancer, bladder cancer, colorectal cancer, gastrointestinal cancer and liver cancer.
  • Another aspect of the invention relates to an isolated nucleic acid molecule comprising a nucleic acid sequence capable of encoding an antibody heavy chain variable region, wherein
  • the antibody heavy chain variable region comprises a CDR having the amino acid sequence of SEQ ID NOs: 27-29;
  • the antibody heavy chain variable region has the amino acid sequence of SEQ ID NO: 6, SEQ ID NO: 10, SEQ ID NO: 14 or SEQ ID NO: 18.
  • nucleic acid molecule has the nucleotide sequence set forth in SEQ ID NO: 5, SEQ ID NO: 9, SEQ ID NO: 13 or SEQ ID NO: 17.
  • the invention also provides an isolated nucleic acid molecule encoding a monoclonal antibody or antigen-binding fragment thereof of the invention.
  • nucleic acid molecules can be isolated from hybridoma cells, or can be obtained by genetic engineering recombinant techniques or chemical synthesis methods.
  • a further aspect of the invention relates to an isolated nucleic acid molecule comprising a nucleic acid sequence capable of encoding a variable region of an antibody light chain, wherein
  • the antibody light chain variable region comprises:
  • amino acid sequence is the CDR of SEQ ID NO: 30-32;
  • amino acid sequences are the CDRs of SEQ ID NO: 30, SEQ ID NO: 31 and SEQ ID NO: 33;
  • amino acid sequences are the CDRs of SEQ ID NO: 30, SEQ ID NO: 31 and SEQ ID NO: 34;
  • the antibody light chain variable region has the SEQ ID NO: 8, SEQ ID NO: 12, SEQ ID NO: 16, SEQ ID NO: 20, SEQ ID NO: 22 or SEQ ID NO: Amino acid sequence;
  • nucleic acid molecule has the nucleotide set forth in SEQ ID NO: 7, SEQ ID NO: 11, SEQ ID NO: 15, SEQ ID NO: 19, SEQ ID NO: 21 or SEQ ID NO: sequence.
  • a further aspect of the invention relates to a vector comprising the isolated nucleic acid molecule of any of the invention.
  • the vector of the present invention may be a cloning vector or an expression vector.
  • the vector of the invention is, for example, a plasmid, a cosmid, a phage, a cosmid, and the like.
  • a further aspect of the invention relates to a host cell comprising the isolated nucleic acid molecule of any of the invention, or the vector of the invention.
  • host cells include, but are not limited to, prokaryotic cells such as E. coli cells, and eukaryotic cells such as yeast cells, insect cells, plant cells, and animal cells (eg, mammalian cells, such as mouse cells, human cells, etc.).
  • the cells of the invention may also be cell lines, such as 293T cells.
  • a further aspect of the invention relates to a method of producing a monoclonal antibody or antigen-binding fragment thereof according to any of the invention, which comprises culturing a host cell of the invention under suitable conditions, and recovering from the cell culture The step of the monoclonal antibody or antigen-binding fragment thereof.
  • a further aspect of the invention relates to a conjugate comprising a monoclonal antibody or antigen-binding fragment thereof, and a conjugated portion, wherein the monoclonal antibody is a monoclonal antibody or antigen-binding thereof according to any one of the invention a fragment, the coupling moiety being a detectable label; in particular, the coupling moiety is a radioisotope, a fluorescent substance, a luminescent substance, a colored substance or an enzyme (eg horseradish peroxidase).
  • a further aspect of the invention relates to a kit comprising the single of any one of the inventions Cloning an antibody or antigen-binding fragment thereof, or comprising a conjugate of the invention;
  • the kit further comprises a second antibody that specifically recognizes the monoclonal antibody or antigen-binding fragment thereof; optionally, the second antibody further comprises a detectable label, such as a radioisotope, a fluorescent substance , a luminescent substance, a colored substance or an enzyme (for example, horseradish peroxidase).
  • a detectable label such as a radioisotope, a fluorescent substance , a luminescent substance, a colored substance or an enzyme (for example, horseradish peroxidase).
  • a further aspect of the invention relates to the use of a monoclonal antibody or antigen-binding fragment thereof according to any of the invention in a kit for detecting the presence or level of CTLA4 in a sample.
  • a further aspect of the invention relates to a pharmaceutical composition
  • a pharmaceutical composition comprising the monoclonal antibody or antigen-binding fragment thereof of any one of the invention or a conjugate of the invention; optionally further comprising a pharmaceutically acceptable Accepted carriers and/or excipients.
  • a further aspect of the invention relates to a monoclonal antibody or antigen-binding fragment thereof according to any of the invention or a conjugate of the invention for the preparation of a medicament for the prophylaxis and/or treatment and/or adjuvant treatment and/or diagnosis of a tumor
  • the tumor is selected from the group consisting of melanoma, renal tumor, prostate cancer, bladder cancer, colorectal cancer, gastrointestinal cancer, and liver cancer.
  • a further aspect of the invention relates to the use of a monoclonal antibody or antigen-binding fragment thereof according to any of the invention or a conjugate of the invention for the preparation of a medicament as follows:
  • a drug that increases the expression of IL-2 in T lymphocytes is a drug that increases the expression of IL-2 in T lymphocytes.
  • a further aspect of the invention relates to an in vivo or in vitro method comprising applying a cell An effective amount of the monoclonal antibody or antigen-binding fragment thereof of any one of the invention or the conjugate of the invention, the method being selected from the group consisting of:
  • a method for increasing IL-2 expression in T lymphocytes is provided.
  • the method can be used for diagnostic or therapeutic purposes, or for non-diagnostic or therapeutic purposes (eg, the sample is a cell sample, not a sample from a patient).
  • a further aspect of the invention relates to a method of preventing and/or treating and/or adjunctively treating and/or diagnosing a tumor comprising administering to the subject an effective amount of the monoclonal antibody or antigen thereof of any one of the invention
  • the step of binding a fragment or a monoclonal antibody conjugate of the present invention; specifically, the tumor is selected from the group consisting of melanoma, renal tumor, prostate cancer, bladder cancer, colorectal cancer, gastrointestinal cancer, and liver cancer.
  • CTLA4 protein Cytotoxic T-Lymphocyte Antigen 4
  • CTLA4 ECD extracellular fragment of CTLA4
  • Fragment also includes a fusion protein of CTLA4ECD, such as a fragment fused to a Fc protein fragment (mFc) of mouse IgG (SEQ ID NO: 3).
  • mFc Fc protein fragment
  • CTLA4 protein shall include all such sequences, including the sequences set forth in SEQ ID NO: 2, as well as natural or artificial variants thereof. Also, when describing a sequence fragment of the CTLA4 protein, it includes not only the sequence fragment of SEQ ID NO: 2 but also the corresponding sequence fragment in its natural or artificial variant.
  • the B7 is B7-1 and/or B7-2; the specific protein sequence is a sequence known in the art, and reference may be made to the existing literature or the sequence disclosed in GenBank. .
  • B7-1 CD80, NCBI Gene ID: 941
  • B7-2 CD86, NCBI Gene ID: 942).
  • EC 50 refers to the term as used herein, half-maximal effective concentration (concentration for 50% of maximal effect ), the concentration refers to cause 50% of maximal effect.
  • antibody refers to an immunoglobulin molecule usually composed of two pairs of polypeptide chains (each pair having one "light” (L) chain and one "heavy” (H) chain. .
  • Antibody light chains can be classified as kappa and lambda light chains.
  • Heavy chains can be classified as ⁇ , ⁇ , ⁇ , ⁇ , or ⁇ , and the isotypes of antibodies are defined as IgM, IgD, IgG, IgA, and IgE, respectively.
  • the variable and constant regions are joined by a "J" region of about 12 or more amino acids, and the heavy chain further comprises a "D" region of about 3 or more amino acids.
  • Each heavy chain is comprised of a heavy chain variable region (V H) and a heavy chain constant region (C H) composition.
  • the heavy chain constant region is comprised of three domains (C H 1, C H 2 and C H 3) components.
  • Each light chain is comprised of a light chain variable region (V L) and a light chain constant region (C L) components.
  • the light chain constant region is comprised of one domain, C L composition.
  • the constant region of the antibody mediates binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (eg, effector cells) and the first component (C1q) of the classical complement system.
  • V H regions may be subdivided into hypervariability regions (termed complementarity determining regions (CDR)), interspersed with regions are more conserved, termed framework regions (FR) of.
  • CDR complementarity determining regions
  • FR framework regions
  • Each V H and V L the following order: FR1, CDR1, FR2, CDR2 , FR3, CDR3, FR4 from the amino terminus to the carboxy terminus arranged three four FR and CDR components.
  • the assignment of amino acids to regions or domains follows the Kabat Sequences of Proteins of Immunological Interest (National Institutes of Health, Bethesda, Md. (1987 and 1991)), or Chothia & Lesk (1987) J.
  • antibody is not limited by any particular method of producing antibodies. For example, it includes, in particular, recombinant antibodies, monoclonal antibodies, and polyclonal antibodies.
  • the antibodies may be antibodies of different isotypes, for example, IgG (eg, IgGl, IgG2, IgG3 or IgG4 subtype), IgA1, IgA2, IgD, IgE or IgM antibodies.
  • an antigen-binding fragment of an antibody refers to a polypeptide comprising a fragment of a full length antibody that retains the ability to specifically bind to the same antigen to which the full length antibody binds, and/or compete with the full length antibody.
  • Specific binding to an antigen which is also referred to as an "antigen-binding portion.” See generally, Fundamental Immunology, Ch. 7 (Paul, W., ed., 2nd ed., Raven Press, NY (1989), which is incorporated herein by reference in its entirety for all purposes.
  • an antigen-binding fragment of an antibody is produced by enzymatic or chemical cleavage of an intact antibody.
  • the antigen-binding fragment includes Fab, Fab', F(ab') 2 , Fd, Fv, dAb and complementarity determining regions (CDRs). Fragments, single chain antibodies (e.g., scFv), chimeric antibodies, diabodies, and polypeptides comprising at least a portion of an antibody sufficient to confer specific antigen binding ability to the polypeptide.
  • Fd fragment means an antibody fragment consisting of V H and C H 1 domains
  • Fv fragment means a single arm of V H and V L domains of an antibody, Antibody fragment
  • dAb fragment means an antibody fragment consisting of a VH domain (Ward et al, Nature 341:544-546 (1989))
  • Fab fragment means by V L , V H , C antibody fragments L and C H 1 domains
  • F (ab ') 2 fragment means antibody fragments comprising two Fab fragments linked by a disulfide bridge at the hinge region.
  • the antigen-binding fragment is a single chain antibody (e.g., the scFv), wherein V L and V H domains are paired to form so that it can be produced by a linker to a single polypeptide chain monovalent molecules (see, e.g., Bird Et al, Science 242: 423-426 (1988) and Huston et al, Proc. Natl. Acad. Sci. USA 85: 5879-5883 (1988)).
  • scFv molecules can have the general structure: NH 2 -V L - linker -V H -COOH or NH 2 -V H - linker -V L -COOH.
  • Suitable prior art linkers consist of a repeating GGGGS amino acid sequence or variants thereof.
  • a linker having the amino acid sequence (GGGGS) 4 can be used, but variants thereof can also be used (Holliger et al. (1993), Proc. Natl. Acad. Sci. USA 90:6444-6448).
  • Other linkers useful in the present invention are by Alfthan et al. (1995), Protein Eng. 8: 725-731, Choi et al. (2001), Eur. J. Immunol. 31: 94-106, Hu et al. (1996), Cancer Res. 56: 3055-3061, Kipriyanov et al. (1999), J. Mol. Biol. 293: 41-56 and Roovers et al. (2001), Cancer Immunol.
  • the antigen-binding fragments are diabodies, i.e., bivalent antibodies in which V H and V L, domains are expressed on a single polypeptide chain, but using a linker that is too short to not allow the same chain in two Pairing between domains forces the domain to pair with the complementary domain of another strand and create two antigen binding sites (see, for example, Holliger P. et al., Proc. Natl. Acad. Sci. USA 90:6444 -6448 (1993), and Poljak RJ et al., Structure 2: 1121-1123 (1994)).
  • Antibodies can be obtained from a given antibody (eg, monoclonal antibody 4B3, 13A10, 12B9 or 4H4 provided herein) using conventional techniques known to those skilled in the art (eg, recombinant DNA techniques or enzymatic or chemical cleavage methods).
  • An antigen-binding fragment for example, the above-described antibody fragment
  • an antigen-binding fragment of the antibody is specifically screened in the same manner as used for the intact antibody.
  • antibody As used herein, unless the context clearly dictates otherwise, when referring to the term “antibody”, it includes not only intact antibodies, but also antigen-binding fragments of antibodies.
  • mAb and “monoclonal antibody” refer to a fragment of an antibody or antibody from a population of highly homologous antibody molecules, ie, in addition to a natural mutation that may occur spontaneously, A group of identical antibody molecules.
  • Monoclonal antibodies are highly specific for a single epitope on the antigen.
  • Polyclonal antibodies are relative to monoclonal antibodies, which typically comprise at least two or more different antibodies, which typically recognize different epitopes on the antigen.
  • Monoclonal antibodies are typically obtained using hybridoma technology first reported by Kohler et al. (Nature, 256:495, 1975), but can also be obtained using recombinant DNA techniques (see, for example, U.S. Patent 4,816,567).
  • monoclonal antibodies are numbered and are numbered from the same number
  • the monoclonal antibodies obtained by the tumor were the same.
  • monoclonal antibody 4B3 (or 13A10, 12B9 or 4H4) is the same antibody as that obtained from hybridoma cell line 4B3 (or 13A10, 12B9 or 4H4) or its subcloned or progeny cells, respectively.
  • chimeric antibody refers to an antibody whose light chain or/and a portion of a heavy chain is derived from an antibody (which may be derived from a particular species or belong to a particular antibody class or Subclass), and another portion of the light or/and heavy chain is derived from another antibody (which may be derived from the same or different species or belonging to the same or different antibody class or subclass), but in any case, it remains Binding activity to the antigen of interest (USP 4,816,567 to Cabilly et al.; Morrison et al., Proc. Natl. Acad. Sci. USA, 81:6851 6855 (1984)).
  • humanized antibody means that all or part of the CDR regions of a human immunoglobulin (receptor antibody) are replaced by a CDR region of a non-human antibody (donor antibody).
  • An antibody or antibody fragment, wherein the donor antibody can be a non-human (eg, mouse, rat or rabbit) antibody having the desired specificity, affinity or reactivity.
  • some of the amino acid residues of the framework region (FR) of the acceptor antibody can also be replaced by amino acid residues of the corresponding non-human antibody or by amino acid residues of other antibodies to further refine or optimize the performance of the antibody.
  • neutralizing antibody refers to an antibody or antibody fragment that is capable of clearing or significantly reducing the virulence of a target virus (eg, the ability to infect a cell).
  • epitope refers to a site on an antigen that is specifically bound by an immunoglobulin or antibody. "Epitope” is also referred to in the art as an "antigenic determinant.”
  • An epitope or antigenic determinant typically consists of a chemically active surface group of a molecule, such as an amino acid or a carbohydrate or sugar side chain, and typically has specific three dimensional structural characteristics as well as specific charge characteristics.
  • an epitope typically includes at least 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 consecutive or non-contiguous amino acids in a unique spatial conformation, which may be "linear" "or” conformational.
  • the terms “isolated” or “isolated” refer to artificially obtained from a natural state. If a certain "separated” substance or component appears in nature, it may be that the natural environment in which it is located has changed, or that the substance has been isolated from the natural environment, or both. For example, a certain living animal has a naturally isolated polynucleotide or polypeptide that is not isolated, and the high purity of the same polynucleotide or polypeptide isolated from this natural state is called separation. of.
  • separation the high purity of the same polynucleotide or polypeptide isolated from this natural state is called separation. of.
  • the term “isolated” or “isolated” does not exclude the inclusion of artificial or synthetic materials, nor does it exclude the presence of other impure substances that do not affect the activity of the material.
  • E. coli expression system refers to an expression system consisting of E. coli (strain) and a vector, wherein E. coli (strain) is derived from a commercially available strain such as, but not limited to, GI698 , ER2566, BL21 (DE3), B834 (DE3), BLR (DE3).
  • vector refers to a nucleic acid vehicle into which a polynucleotide can be inserted.
  • a vector is referred to as an expression vector when the vector enables expression of the protein encoded by the inserted polynucleotide.
  • the vector can be introduced into the host cell by transformation, transduction or transfection, and the genetic material element carried thereby can be expressed in the host cell.
  • Vectors are well known to those skilled in the art and include, but are not limited to, plasmids; phagemids; cosmids; artificial chromosomes, such as yeast artificial chromosomes (YAC), bacterial artificial chromosomes (BAC), or P1 derived artificial chromosomes (PAC).
  • Phage such as lambda phage or M13 phage and animal virus.
  • Animal viruses useful as vectors include, but are not limited to, retroviruses (including lentiviruses), adenoviruses, adeno-associated viruses, herpes viruses (such as herpes simplex virus), poxviruses, baculoviruses, papillomaviruses, nipples Multi-tumor vacuolar virus (such as SV40).
  • a vector may contain a variety of elements that control expression, including, but not limited to, promoter sequences, transcription initiation sequences, enhancer sequences, selection elements, and reporter genes. In addition, the vector may also contain an origin of replication.
  • the term "host cell” refers to a cell that can be used to introduce a vector, including, but not limited to, a prokaryotic cell such as Escherichia coli or Bacillus subtilis, such as a fungal cell such as a yeast cell or an Aspergillus.
  • a prokaryotic cell such as Escherichia coli or Bacillus subtilis
  • a fungal cell such as a yeast cell or an Aspergillus.
  • S2 Drosophila cells or insect cells such as Sf9
  • animal cells such as fibroblasts, CHO cells, COS cells, NSO cells, HeLa cells, BHK cells, HEK 293 cells or human cells.
  • identity is used to mean the matching of sequences between two polypeptides or between two nucleic acids.
  • a position in the two sequences being compared is occupied by the same base or amino acid monomer subunit (for example, a position in each of the two DNA molecules is occupied by adenine, or two
  • Each position in each of the polypeptides is occupied by lysine, and then each molecule is identical at that position.
  • the "percent identity" between the two sequences is a function of the number of matching positions shared by the two sequences divided by the number of positions to be compared x 100. For example, if 6 of the 10 positions of the two sequences match, then the two sequences have 60% identity.
  • the DNA sequences CTGACT and CAGGTT share 50% identity (3 out of a total of 6 positions match).
  • the comparison is made when the two sequences are aligned to produce maximum identity.
  • Such alignment can be achieved by, for example, the method of Needleman et al. (1970) J. Mol. Biol. 48: 443-453, which can be conveniently performed by a computer program such as the Align program (DNAstar, Inc.). It is also possible to use the algorithm of E. Meyers and W. Miller (Comput. Appl Biosci., 4: 11-17 (1988)) integrated into the ALIGN program (version 2.0), using the PAM 120 weight residue table.
  • the gap length penalty of 12 and the gap penalty of 4 were used to determine the percent identity between the two amino acid sequences.
  • the Needleman and Wunsch (J MoI Biol. 48: 444-453 (1970)) algorithms in the GAP program integrated into the GCG software package can be used, using the Blossum 62 matrix or The PAM250 matrix and the gap weight of 16, 14, 12, 10, 8, 6 or 4 and the length weight of 1, 2, 3, 4, 5 or 6 to determine the percent identity between two amino acid sequences .
  • conservative substitution means an amino acid substitution that does not adversely affect or alter the essential properties of a protein/polypeptide comprising an amino acid sequence. For example, it can be introduced by standard techniques known in the art such as site-directed mutagenesis and PCR-mediated mutagenesis. Keep the replacement. Conservative amino acid substitutions include substitutions of amino acid residues with similar side chains in place of amino acid residues, for example, physically or functionally similar to corresponding amino acid residues (eg, having similar size, shape, charge, chemical properties, including Substitution of residues by formation of a covalent bond or a hydrogen bond, etc.). A family of amino acid residues having similar side chains has been defined in the art.
  • These families include basic side chains (eg, lysine, arginine, and histidine), acidic side chains (eg, aspartic acid, glutamic acid), uncharged polar side chains (eg, glycine) , asparagine, glutamine, serine, threonine, tyrosine, cysteine, tryptophan), non-polar side chains (eg alanine, valine, leucine, isoluminescence) Acid, valine, phenylalanine, methionine), beta branch side chains (eg, threonine, valine, isoleucine) and aromatic side chains (eg, tyrosine, Amino acids of phenylalanine, tryptophan, histidine).
  • basic side chains eg, lysine, arginine, and histidine
  • acidic side chains eg, aspartic acid, glutamic acid
  • uncharged polar side chains eg, glycine
  • the term "immunogenicity” refers to the ability to stimulate the body to form specific antibodies or sensitize lymphocytes. It means that the antigen can stimulate specific immune cells, activate, proliferate and differentiate immune cells, and finally produce the characteristics of immune effector substances such as antibodies and sensitized lymphocytes. It also means that after the antigen stimulates the body, the body's immune system can form antibodies or A specific immune response to sensitized T lymphocytes. Immunogenicity is the most important property of an antigen. Whether an antigen can successfully induce an immune response in a host depends on three factors: the nature of the antigen, the reactivity of the host, and the mode of immunization.
  • an antibody that specifically binds to an antigen means that the antibody is less than about 10 -5 M, such as less than about 10 -6 M, 10 -7 M, Affinity (K D ) of 10 -8 M, 10 -9 M or 10 -10 M or less binds to the antigen.
  • K D refers to a particular antibody - antigen interaction dissociation equilibrium constant, which is used to describe the binding affinity between antibody and antigen. The smaller the equilibrium dissociation constant, the tighter the antibody-antigen binding and the higher the affinity between the antibody and the antigen.
  • the antibody e.g., monoclonal antibody 4B3, 13A10, 12B9 or 4H4 of the invention
  • the antibody is less than about 10 -5 M, such as less than about 10 -6 M, 10 -7 M, 10 -8 M, 10 -9 M
  • a dissociation equilibrium constant (K D ) of 10 -10 M or less binds to an antigen (eg, L1 protein), for example, as determined using surface plasmon resonance (SPR) in a BIACORE instrument.
  • SPR surface plasmon resonance
  • amino acids are generally represented by single letter and three letter abbreviations as are known in the art.
  • alanine can be represented by A or Ala.
  • hybridomas and “hybridoma cell lines” are used interchangeably and, when referring to the terms “hybridomas” and “hybridoma cell lines”, they also include subclones of hybridomas. And progeny cells. For example, when referring to hybridoma cell line 4B3, it also refers to subcloning and progeny cells of hybridoma cell line 4B3.
  • pharmaceutically acceptable carrier and/or excipient refers to a carrier and/or excipient that is pharmacologically and/or physiologically compatible with the subject and the active ingredient, It is well known in the art (see, for example, Remington's Pharmaceutical Sciences. Edited by Gennaro AR, 19th ed. Pennsylvania: Mack Publishing Company, 1995) and includes, but is not limited to, pH adjusters, surfactants, adjuvants, ions. Strength enhancer.
  • pH adjusting agents include, but are not limited to, phosphate buffers; surfactants include, but are not limited to, cationic, anionic or nonionic surfactants such as Tween-80; ionic strength enhancers include, but are not limited to, sodium chloride.
  • adjuvant refers to a non-specific immunopotentiator that, when brought together with an antigen or pre-delivered into the body, enhances the body's immune response to the antigen or alters the type of immune response.
  • adjuvants including but not limited to aluminum adjuvants (such as aluminum hydroxide), Freund's adjuvant (such as complete Freund's adjuvant and incomplete Freund's adjuvant), Corynebacterium parvum, lipopolysaccharide, cytokines, etc. .
  • Freund's adjuvant is the most commonly used adjuvant in animal testing.
  • Aluminum hydroxide adjuvant is used more in clinical trials.
  • an effective amount refers to an amount sufficient to achieve, or at least partially achieve, a desired effect.
  • an effective amount for preventing a disease for example, a CTLA4 binding to B7 or a CTLA4 activity associated with a disease such as a tumor
  • an amount sufficient to prevent, prevent, or delay a disease for example, a disease associated with CTLA4 binding to B7 or excessive activity of CTLA4 such as a tumor.
  • An amount effective to treat; an amount effective to treat a disease is an amount sufficient to cure or at least partially arrest a disease and a complication thereof in a patient already suffering from the disease. Determination of such an effective amount is well within the capabilities of those skilled in the art.
  • the amount effective for therapeutic use will depend on the severity of the condition to be treated, the overall condition of the patient's own immune system, the general condition of the patient such as age, weight and sex, the mode of administration of the drug, and other treatments for simultaneous administration. and many more.
  • the monoclonal antibody 8D2 of the present invention and the humanized antibody thereof are well specific for binding to CTLA4, wherein the binding efficiency of the antibody 8D2, 8D2(Re) to the murine CTLA4 antigen is stronger than that of the control antibody 10D1 (Alan J. Korman) , Edward L. Halk, et al., HUMAN CTLA-4 ANTIBODIES, United State Patent No. US 6984720 B1) and 11.2.1 (Douglas Charles Hanson, Mark Joseph Neveu, et al., Human monoclonal antibodies to CTLA-4, United State Patent No. US 682736 B1).
  • the binding efficiency of the humanized antibody 8D2H1L1 to the murine CTLA4 antigen was stronger than that of the control antibody 10D1, which was comparable to 11.2.1.
  • the binding efficiency of the humanized antibody 8D2H2L2 to the human CTLA4 antigen was comparable to that of 10D1.
  • the binding efficiency of the humanized antibodies 8D2H2L2 and 8D2H3L3 to the monkey CTLA4 antigen was comparable to that of 10D1.
  • the binding efficiency of the antibodies 8D2H2L15 and 8D2H2L17 to the human CTLA4 antigen was stronger than that of the control antibodies 10D1 and 11.2.1.
  • the antibodies 8D2, 8D2 (Re) and 8D2 humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, 8D2H2L17 competed with B7 for binding to the antigen CTLA4.
  • 8D2, 8D2 (Re), 8D2H1L1, 8D2H2L2 and B7-2 compete with CTLA4 stronger than 10D1; 8D2H1L1, 8D2H2L2, 8D2H3L3; 8D2H2L15, 8D2H2L17 and B7-1, B7-2 competitive binding CTLA4 is stronger than antibody 10D1 And 11.2.1.
  • the monoclonal antibody 8D2 of the present invention and the humanized antibody thereof can block the binding of CLTA4 and B7 very effectively, specifically relieve CTLA4 from immunosuppression of the body, and activate T lymphocytes.
  • 8D2H2L2 and 8D2H2L15 were stronger against T lymphocytes than control antibodies 10D1 and 11.2.1.
  • Figure 1 Results of SDS-PAGE detection of CTLA4 ECD-mFc fusion protein.
  • the samples from the four lanes from left to right and their loadings were: M: marker 10 ⁇ L; CTLA4 ECD-mFc fusion protein 1 ⁇ g; CTLA4 ECD-mFc fusion protein 2 ⁇ g; CTLA4 ECD-mFc fusion protein 3 ⁇ g.
  • Figure 2 Results of SDS-PAGE detection of 8D2 antibody.
  • the samples from the left to the right of the four lanes were loaded with M:marker 10 ⁇ L; reduced protein electrophoresis loading buffer sample antibody 0.3 ⁇ g; non-reduced protein electrophoresis loading buffer 2 ⁇ L; non-reduced type Protein electrophoresis loading buffer sample antibody 0.3 ⁇ g.
  • Figure 3 Results of SDS-PAGE detection of 8D2 recombinant antibody (8D2 (Re)).
  • the samples from the left to the right of the four lanes were loaded with: M:marker 10 ⁇ L; reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g; non-reduced protein electrophoresis loading buffer 2 ⁇ L; non-reduced protein Electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 4 Results of SDS-PAGE detection of humanized antibody 8D2H1L1 of 8D2.
  • the samples from the left to the right of the four lanes were loaded with: M:marker 10 ⁇ L; reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g; non-reduced protein electrophoresis loading buffer 2 ⁇ L; non-reduced protein Electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 5 Results of SDS-PAGE detection of humanized antibody 8D2H2L2 of 8D2.
  • the samples from the left to the right of the four lanes were loaded with: M:marker 10 ⁇ L; reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g; non-reduced protein electrophoresis loading buffer 2 ⁇ L; non-reduced protein Electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 6 Results of SDS-PAGE detection of humanized antibody 8D2H3L3 of 8D2.
  • the samples from the four lanes from left to right and their loadings were: M:marker 10 ⁇ L; Prototype protein electrophoresis loading buffer sample antibody 1 ⁇ g; non-reduced protein electrophoresis loading buffer 2 ⁇ L; non-reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 7 Results of SDS-PAGE detection of humanized antibody 8D2H2L15 of 8D2.
  • the sample and the amount of the sample were respectively: M:marker 10 ⁇ L; 1: non-reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g; 2: reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 8 Results of SDS-PAGE detection of humanized antibody 8D2H2L17 of 8D2.
  • the sample and the amount of the sample were respectively: M:marker 10 ⁇ L; 1: non-reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g; 2: reduced protein electrophoresis loading buffer sample antibody 1 ⁇ g.
  • Figure 14 Results of the kinetic characteristic parameters of 8D2H2L17.
  • Figure 15 Flow cytometry detection of 293F cell label-free, isotype control, CTLA4 expression histogram of 293F-CTLA4 cells (cell number-fluorescence (FITC)).
  • Figure 16 Flow cytometry to detect the mean fluorescence intensity (MFI) of CTLA4 expression in 293F cells without label, isotype control, 293F-CTLA4 cells.
  • MFI mean fluorescence intensity
  • Figure 17 Binding of monoclonal antibody 8D2 and EC 50 results 293F-CTLA4 labeled cells.
  • Fig 18 EC bound 8D2 (Re) labeled antibody to cells 50 293F-CTLA4 results.
  • FIG 19 EC 50 in combination with the results 8D2H1L1 293F-CTLA4 labeled cells.
  • Figure 20 Binding of the labeled 8D2H2L2 293F-CTLA4 cells EC 50 results.
  • FIG 21 8D2H3L3 293F-CTLA4 binding to cells labeled EC 50 results.
  • Figure 22 ELISA method detects binding of 8D2, 8D2H1L1, 8D2 recombinant antibody to CTLA4.
  • Figure 23 ELISA method detects binding of 8D2H2L2, 8D2H3L3 recombinant antibody to human CTLA4.
  • Figure 24 ELISA method detects binding of 8D2H2L2, 8D2H3L3 recombinant antibody to monkey CTLA4.
  • Figure 25 ELISA method detects binding of 8D2H2L15, 8D2H2L17 recombinant antibody to monkey CTLA4.
  • Figure 26 Results of the 8D2, 8D2H1L1, 8D2 recombinant antibody and B7-1 competition ELISA.
  • Figure 27 Competition ELISA results for 8D2, 8D2H1L1, 8D2 recombinant antibodies and B7-2.
  • Figure 28 Competition ELISA results for 8D2H2L2, 8D2H3L3 antibody and B7-1.
  • Figure 30 Results of competition ELISA between 8D2H2L15 and 8D2H2L17 antibodies and B7-1.
  • Figure 31 Competition ELISA results for 8D2H2L15, 8D2H2L17 antibody and B7-2.
  • Figure 32 Effect of peripheral blood mononuclear cells (PBMC), Raji cells and humanized antibodies 8D2H1L1, 8D2H2L2, and 8D2H3L3 after 72 hours of co-culture for 72 hours.
  • PBMC peripheral blood mononuclear cells
  • the results show that the humanized antibody of monoclonal antibody 8D2 enhances the secretion of IL-2 by T lymphocytes by blocking the receptor of CTLA4.
  • Figure 33 Effect of peripheral blood mononuclear cells (PBMC), Raji cells and humanized antibodies 8D2H2L15, 8D2H2L17 for 72 hours after co-culture for 72 hours.
  • PBMC peripheral blood mononuclear cells
  • the results show that the humanized antibody of monoclonal antibody 8D2 enhances the secretion of IL-2 by T lymphocytes by blocking the receptor of CTLA4.
  • Figure 34 Tumor growth curve of subcutaneously transplanted 8D2H2L2 in the hu-SCID-raji model.
  • the BALB/C mice used were purchased from the Guangdong Medical Laboratory Animal Center.
  • the T cells used were from Zhongshan Kangfang Biomedical Co., Ltd.
  • Control antibody 10D1 was prepared with reference to US Pat. No. 6,984, 420 B1; 11.2.1 was prepared with reference to US 6,682,736 B1.
  • Example 1 Obtainment and monoclonalization of CTLA4-8D2 hybridoma cell line LT001 Preparation of antibody 8D2
  • the mammalian cell expression system is used to express recombinant CTLA4 as an antigen to immunize mice, and the mouse spleen cells are fused with myeloma cells to obtain hybridoma cells.
  • a hybridoma cell line (CTLA4-8D2 hybridoma cell line LT001) was obtained, which was able to secrete monoclonal antibody 8D2 which specifically binds to CTLA4.
  • the specific method is as follows:
  • Amino acid (SEQ ID NO: 2) corresponding to the extracellular fragment CTLA4ECD (Cytotoxic T-Lymphocyte Antigen 4, NCBI Gene ID: 1493, SEQ ID NO: 1) of the gene CTLA4 and an Fc protein fragment (mFc) of mouse IgG A fusion design (SEQ ID NO: 3) was carried out, wherein mFc refers to an Fc protein fragment of murine IgG, the amino acid sequence of which is shown in the underlined portion of SEQ ID NO: 3.
  • CTLA4ECD Cytotoxic T-Lymphocyte Antigen 4, NCBI Gene ID: 1493, SEQ ID NO: 1
  • mFc Fc protein fragment of mouse IgG
  • a fusion design (SEQ ID NO: 3) was carried out, wherein mFc refers to an Fc protein fragment of murine IgG, the amino acid sequence of which is shown in the underlined portion of SEQ ID NO: 3.
  • Jinsi Rui Company was commissioned to optimize the nucleic acid sequence corresponding to the SEQ ID NO: 3 protein sequence, and the optimization mainly considered codon preference, GC content, and mRNA II. Stage structure, repeating sequence and other factors.
  • the sequence of the final CTLA4 ECD-mFc fusion protein gene was optimized as follows (SEQ ID NO: 4) and was commissioned by Kingsray.
  • CTLA4ECD encoded protein sequence (125aa)
  • CTLA4ECD-mFc fusion protein sequence (364aa)
  • the wavy underline is the CTLA4ECD portion
  • the solid underline is the mFc portion.
  • the wavy underline is the CTLA4ECD part
  • the solid underline is mFc part.
  • the synthetic CTLA4ECD-mFc fusion gene (SEQ ID NO: 4) was cloned into the pUC57simple (provided by Kingsray) expression vector by Kingsray, and the pUC57simple-CTLA4ECD-mFc plasmid was obtained.
  • the plasmid pUC57simple-CTLA4ECD-mFc was digested (Xba I and BamH I), and the fusion gene fragment CTLA4ECD-mFc obtained by electrophoresis was ligated with the pcDNA3.1 expression vector (purchased from Invitrogen) to obtain pcDNA3.1-CTLA4ECD.
  • -mFc transfected competent E. coli cells DH5a (purchased from TIANGEN), transfection and culture were carried out according to the instructions.
  • the positive pcDNA3.1-CTLA4ECD-mFc clone colony was screened, and the Escherichia coli was amplified according to the conventional method, and then extracted by a kit (purchased from Tiangen Biochemical Technology (Beijing) Co., Ltd., DP103-03) and according to the instructions of the kit.
  • the pcDNA3.1-CTLA4ECD-mFc recombinant plasmid was obtained.
  • the recombinant plasmid pcDNA3.1-CTLA4ECD-mFc was transfected into 293F cells (purchased from Invitrogen) according to the lipofectamin transfection kit (purchased from Invitrogen).
  • the culture medium was purified by high-speed centrifugation, microfiltration membrane filtration and HiTrap protein A HP column for purification of CTLA4ECD-mFc fusion protein.
  • the sample was added to a reduced protein electrophoresis loading buffer and subjected to SDS-PAGE electrophoresis. As shown in Figure 1, the target protein is approximately 45 kD.
  • CTLA4ECD-mFc fusion protein as antigen, spleen cells from immunized BALB/C mice (purchased from Guangdong Medical Experimental Animal Center) were fused with mouse myeloma cells into hybridoma cells, according to the currently established method (eg, Stewart , SJ, "Monoclonal Antibody Production", in Basic Methods in antibody Production and Characterization, Eds. GC Howard and DR Bethell, Boca Raton: CRC Press, 2000).
  • CTLA4 as an antigen coating enzyme plate, screening by indirect ELISA Hybridoma cells that secrete new antibodies that specifically bind to CTLA4.
  • Hybridoma cells screened by indirect ELISA were screened by competition ELISA to secrete a single cell that competes with ligand B7-1 (CD80, NCBI Gene ID: 941), B7-2 (CD86, NCBI Gene ID: 942) for binding to CTLA4.
  • the hybridoma cell strain of the antibody was cloned, and a stable hybridoma cell strain was obtained by a limiting dilution method.
  • the hybridoma cell line was named as a CTLA4-8D2 hybridoma cell line, and a CTLA4-8D2 stable cell line (also referred to as LT001 cells in the present invention, and the secreted monoclonal antibody was named 8D2) was obtained by a limiting dilution method.
  • CTLA4-8D2 (LT001) cell line of the present invention was cultured with 10% low IgG fetal bovine serum, and the cell culture supernatant was collected 7 days later to be purified to prepare antibody 8D2.
  • the purified sample is separately added to a reduced protein electrophoresis loading buffer and a non-reduced protein electrophoresis loading buffer, and then boiled for detection.
  • the results showed that the target protein of the reduced protein sample was approximately 50 kD and 25 kD, and the target protein of the non-reduced protein sample was approximately 150 kD (Fig. 2).
  • mRNA was extracted from the CTLA4-8D2 hybridoma cell strain (LT001 cells) prepared in Example 1 according to the method of culturing the cell bacterial total RNA extraction kit (Tiangen, Cat. No. DP430).
  • the cDNA was synthesized by the III First-Strand Synthesis System for RT-PCR kit and subjected to PCR amplification.
  • the PCR amplification product was directly subjected to TA cloning, and the specific procedure was carried out in accordance with the instructions of the pEASY-T1 Cloning Kit (Transgen CT101) kit.
  • the product of the TA clone was directly sequenced, and the sequencing results were as follows:
  • Example 3 Humanized antibody 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 And the design of the light and heavy chain sequences of 8D2H2L17
  • variable region sequences of 8D2H3L3, 8D2H2L15 and 8D2H2L17 are as follows:
  • Example 4 8D2 recombinant antibody 8D2 (Re) and 8D2 humanized antibody 8D2H1L1 Preparation and SDS-PAGE of 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17 Electrophoresis detection
  • the 8D2 heavy chain cDNA sequence (the variable region sequence thereof is shown in SEQ ID NO: 5) and the light chain cDNA sequence (the variable region sequence thereof are shown in SEQ ID NO: 7) were cloned into pUC57simple (Kings) In the vector provided by Rui Company, the pUC57simple-8D2H and pUC57simple-8D2L plasmids were obtained, respectively.
  • the plasmids pUC57simple-8D2H and pUC57simple-8D2L were digested respectively (HindIII & EcoRI), and the heavy chain light chains recovered by electrophoresis were subcloned into pcDNA3.1 vector, and the recombinant plasmid was co-transfected into 293F cells. After 7 days of cell culture, the culture solution was purified by high-speed centrifugation, microfiltration membrane vacuum filtration and HiTrap protein A HP column, and the purified sample was separately added to reduced protein electrophoresis loading buffer and non-reduced protein electrophoresis. The sample buffer was boiled and subjected to SDS-PAGE electrophoresis. As shown in Fig. 3, the reduced protein sample target protein is approximately 50 kD and 25 KD, and the non-reduced protein sample target protein is approximately 150 kD.
  • the heavy chain cDNAs of 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17 (the variable region sequences thereof are SEQ ID NO: 9, SEQ ID NO: 13, SEQ ID NO: 17, SEQ ID NO: 13, SEQ ID NO: 13) and the light chain cDNA (the variable region sequences thereof are shown in SEQ ID NO: 11, SEQ ID NO: 15, SEQ ID NO: 19, SEQ ID NO: 21, SEQ ID NO: 23, respectively)
  • the plasmid was cloned into pUC57simple (provided by Kingsray) to obtain pUC57simple-8D2H1L1, pUC57simple-8D2H2L2, pUC57simple-8D2H3L3, pUC57simple-8D2H2L15, pUC57simple-8D2H2L17 plasmid, and subcloned into pcDNA3.1 vector, respectively,
  • the recombinant plasmid was transfected into 293F cells, and the culture solution was purified and detected (the same method as 8D2 (Re) described above). The results are shown in Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, respectively, and reduced proteins.
  • the target protein of the sample is approximately 50kD and 25KD, non-reduced protein-like The target protein is approximately 150 kD.
  • the 8D2 recombinant antibody 8D2 (Re) and the 8D2 humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17 used in the following examples were all prepared according to the method of the present example.
  • Antibody 8D2 and humanized 8D2H1L1, 8D2H2L2, 8D2H3L3 and antigen CTLA4 were determined using a Fortebio molecular interaction instrument (NCBI Gene ID: 1493, encoding the nucleic acid sequence is SEQ ID NO: 25, and the encoded amino acid sequence is SEQ ID NO: 26) Combined kinetic parameters.
  • CTLA4-mFc protein was digested with TEV protease (the synthesis of CTLA4-mFc was the same as that of CTLA4 ECD-mFc described in Example 1), and purified by column to obtain CTLA4 antigen.
  • Antibody 8D2 and its humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, 8D2H2L17 were immobilized on the surface of AR2G sensor by amino coupling, blocked by ethanolamine, equilibrated in PBST, combined with antigen CTLA4, used for CTLA4
  • the PBST was diluted twice, at concentrations of 300, 150, 75, 37.5, 18.75, 9.38, 4.69, 0 nM, and dissociated in PBST.
  • the detection methods of humanized 8D2H1L1, H2L2, H3L3, H2L15, and H2L17 were the same as those of 8D2, and the antigen concentrations were 180, 90, 45, 22.5, 11.25, 5.625, 2.813, and 0 nM.
  • the kinetic parameters of antibody 8D2 and its humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, 8D2H2L17 are shown in Table 1, and the kinetic characteristic parameters are shown in Figure 9-14.
  • Example 6 Flow cytometry method for detecting antibody and hybridoma cell line surface antigen CTLA4 binding activity
  • a host cell 293F expressing the CTLA4 antigen was constructed; then the monoclonal antibody 8D2 prepared in the present invention (see Example 1) and the prepared 8D2 (Re) and 8D2 humanized antibodies 8D2H1L1, 8D2H2L2 and 8D2H3L3 were used (see Example 4). ) Mark the host cell. Flow cytometry analysis was then used to verify that antibodies 8D2, 8D2 (Re) and 8D2 humanized antibodies 8D2H1L1, 8D2H2L2 and 8D2H3L3 have specific binding to antigens with a native conformation on the cell surface.
  • the vector pLenti6.3-CTLA4 (vector pLenti6.3 purchased from Invitrogen) containing CTLA4 was transfected into 293F cells according to the lipofectamin transfection kit (purchased from Invitrogen), and the cloned population 293F-CTLA4 stably expressing CTLA4 was obtained by screening. cell.
  • the host cell 293F expressing the CTLA4 antigen obtained by the above-mentioned steps of the conventional trypsin digestion method was used, and the number of cells in each collection tube was 2 ⁇ 10 5 , and the concentrations were 20 nM, 10 nM, 5 nM, 1 nM in PBS (1% BSA), respectively.
  • the results of CTLA4 expression verification of 293F-CTLA4 cells are shown in Fig. 15 and Fig. 16.
  • the results of binding of 8D2, 8D2 (Re) antibody and 3 humanized antibody to 293F cells are shown in Figures 17-21, respectively.
  • the 8D2 antibody and its humanized antibody can effectively bind to the target CTLA protein on the surface of the host cell 293F, and the binding efficiency is dose-dependent.
  • the fluorescence intensity of each dose is shown in Table 2.
  • Table 2 Fluorescence intensity analysis of 8D2, 8D2 (Re) and 8D2 humanized antibodies 8D2H1L1, 8D2H2L2 and 8D2H3L3 binding to CTLA4 host cell 293F surface antigen CTLA4 by flow cytometry
  • Table 3 Flow cytometry detection analysis curve simulation of 8D2, 8D2 (Re) and 8D2 humanized antibody 8D2H1L1, 8D2H2L2, 8D2H3L3 and CTLA4 host cell 293F surface antigen CTLA4 binding efficiency EC 50
  • Example 7 Detection of binding activity of antibody to antigen CTLA4 by ELISA method
  • Table 9 ELISA analysis curve simulating the binding efficiency of 8D2, 8D2 (Re) and 8D2 humanized antibody 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, 8D2H2L17 and CTLA4 antigen EC 50
  • the binding efficiency of the humanized antibody 8D2H2L2 to the human CTLA4 antigen was comparable to that of 10D1.
  • the binding efficiency of the humanized antibodies 8D2H2L2 and 8D2H3L3 to the monkey CTLA4 antigen was comparable to that of 10D1.
  • the binding efficiency of the antibodies 8D2H2L15 and 8D2H2L17 to the human CTLA4 antigen was significantly stronger than the control antibodies 10D1 and 11.2.1.
  • Example 8 Competitive ELISA method detects that an antibody competes with B7-1/2 for binding antigen CTLA4 binding activity
  • the antibody was labeled with CTLA4-mFc at 4 ° C overnight, blocked with 1% BSA at 37 ° C for 2 hours, and anti-CTLA4 antibody monoclonal antibody 8D2, 8D2 (Re) and 8D2 humanized antibody 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17 and the control antibody 10D1 and 11.2.1 were incubated for 10 minutes, and then incubated with B7-2-his at 37 ° C for 40 min, and then added with the enzyme-labeled secondary antibody at 37 ° C for 30 min. The absorbance at 450 nm was measured on a microplate reader.
  • Table 17 Competition ELISA analysis curve simulation of 8D2, 8D2 (Re) and 8D2 humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, 8D2H2L17 compete with B7 for binding antigen CTLA4 binding efficiency EC 50
  • 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15, and 8D2H2L17 all compete with B7 for binding to antigen CTLA4.
  • 8D2, 8D2 (Re), 8D2H1L1, 8D2H2L2 and B7-2 competed with CTLA4 stronger than 10D1; 8D2H2L17 and B7-1, B7-2 competitive binding CTLA4 were significantly stronger than antibodies 10D1 and 11.2.1.
  • Example 9 Monoclonal antibody 8D2 and humanized antibody 8D2H1L1, 8D2H2L2 Analysis of Cellular Biological Activity of 8D2H3L3, 8D2H2L15 and 8D2H2L17
  • peripheral blood mononuclear cells PBMC
  • the peripheral blood of healthy people was collected with a heparin-containing blood collection tube, diluted with PBS and centrifuged (2550 rpm, 20 minutes) to obtain a cell suspension, PBMC, and SEB (1 ⁇ g/mL)/PHA (30 ⁇ l) was added to the cell suspension.
  • the experimental results are statistically analyzed, as shown in Figure 32-33.
  • the humanized antibodies 8D2H1L1, 8D2H2L2, 8D2H3L3, 8D2H2L15 and 8D2H2L17 of monoclonal antibody 8D2 were able to effectively block the binding of CTLA4 to B7 and increase IL-2 in T lymphocytes compared with T cells and with Raji cells. Expression (Figs.
  • Example 10 In vivo antitumor activity of monoclonal antibody 8D2H2L2
  • the in vivo antitumor activity of 8D2H2L2 was evaluated using the hu-SCID-raji animal model.
  • PBMC peripheral blood mononuclear cells
  • PBMCs were activated with SEB 1 ⁇ g/ml for 3 days, and then 1.25 million activated PBMCs were mixed with 5 million Burkitt lymphoma cells raji and 8D2H2L2 (20 mg/kg).

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