WO2014169494A1 - 特异性识别egfr突变蛋白的单克隆抗体、制备方法及其应用 - Google Patents

特异性识别egfr突变蛋白的单克隆抗体、制备方法及其应用 Download PDF

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WO2014169494A1
WO2014169494A1 PCT/CN2013/074626 CN2013074626W WO2014169494A1 WO 2014169494 A1 WO2014169494 A1 WO 2014169494A1 CN 2013074626 W CN2013074626 W CN 2013074626W WO 2014169494 A1 WO2014169494 A1 WO 2014169494A1
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egfr
monoclonal antibody
cctcc
protein
cancer
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PCT/CN2013/074626
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French (fr)
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吴正东
黄文俊
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武汉纽斯特生物技术有限公司
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K16/00Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2863Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for growth factors, growth regulators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00Antineoplastic agents

Definitions

  • the present invention is in the field of biological sciences and pharmaceutical carriers, and in particular relates to monoclonal antibodies that specifically recognize EGFR mutant proteins, methods for their preparation, and their use as diagnostic and therapeutic agents. Background technique
  • the EGFR protein (Epidermal Growth Factor Receptor, also known as ErbB-1 or HER1) is a transmembrane receptor member of the epidermal growth factor receptor family on the cell surface. EGFR binds to extracellular epidermal growth factor (EGF), thereby transmitting extracellular signals into the cell. Mutations in EGFR proteins are present in a variety of human cancers, such as lung cancer, anal cancer, rectal cancer, and breast cancer (Paez JG et al., Science, 304 (5676): 1497-500 (2004)). These mutations result in sustained activation of the EGFR protein, which in turn promotes cell proliferation and cancer cell growth. Common EGFR muteins are G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D and V769L.
  • Inhibitors for EGFR muteins have been marketed, including IressaTM (Genf itinib), TarcevaTM (chemical name Erlotinib), etc. (Mayumi Onol and Michihiko Kuwano, Clin. Cancer Res 12: 7242 (2006) ). These inhibitor drugs are specific for the mutated EGFR protein, so before use, it is necessary to detect whether the patient has an EGFR mutation with an antibody that specifically binds to the mutated EGFR protein but does not bind to the wild-type EGFR protein (Pal lis AG et al., J. Cancer. 105 (1) : 1-8. (2011) ). This antibody can be used to rapidly detect small amounts of samples taken from patients for the diagnosis of cancer. Antibodies that specifically bind to EGFR muteins are also urgently needed to treat cancer. Summary of the invention
  • the object of the present invention is to provide specific recognition of EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D and respectively to solve the above problems.
  • the monoclonal antibodies prepared by the method of the present invention are capable of specifically recognizing G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D and V769L mutant proteins, respectively, without recognizing the wild type EGFR protein.
  • the monoclonal antibody or antigen binding site that specifically recognizes an EGFR mutein is characterized by a heavy chain and a light chain; CDR1, CDR2 and CDR3 of the heavy and light chains
  • the amino acid sequences are hybridomas from the China Type Culture Collection (CCTCC) under the accession numbers CCTCC C20130 K CCTCC C2012127, CCTCC C20121 18, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304 and CCTCC C201316.
  • the amino acid sequences of the CDR1, CDR2 and CDR3 of the monoclonal antibody produced by the cell are determined.
  • the monoclonal antibody or antigen-binding site that specifically recognizes an EGFR mutein is characterized by comprising a heavy chain and a light chain of a monoclonal antibody produced by the hybridoma cell, respectively.
  • the antibody or antigen binding site comprises the amino acid sequences of the heavy and light chain variable regions of the monoclonal antibodies produced by the hybridoma cells described above.
  • the monoclonal antibody of the present invention may be a humanized or chimeric antibody.
  • the monoclonal antibody is IgG.
  • the invention includes preservation in the China Type Culture Collection (CCTCC) deposit number CCTCC C20130 K CCTCC C2012127, CCTCC C20121 18, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304 and CCTCC Hybridoma cells of C201316.
  • CTCC China Type Culture Collection
  • the invention includes a medicament comprising the monoclonal antibody or antigen binding site or a carrier useful for the medicament.
  • the present invention also encompasses a diagnostic kit comprising the monoclonal antibody or antigen binding site thereof as referred to in the present invention.
  • the present invention can provide a method for cancer diagnosis (for example, lung cancer, non-small cell lung cancer, rectal cancer, colon cancer, papillary thyroid cancer, pancreatic cancer, esophageal cancer, Prostate cancer, ovarian cancer, glioma, brain cancer), the main steps thereof include: contacting a biological sample from a detection target with the monoclonal antibody of the present invention; detecting whether the antibody or a part thereof binds to the sample; Binding to the sample indicates that the subject is cancer or has a risk of developing cancer.
  • a method for cancer diagnosis for example, lung cancer, non-small cell lung cancer, rectal cancer, colon cancer, papillary thyroid cancer, pancreatic cancer, esophageal cancer, Prostate cancer, ovarian cancer, glioma, brain cancer
  • the main steps thereof include: contacting a biological sample from a detection target with the monoclonal antibody of the present invention; detecting whether the antibody or a part thereof binds to the sample; Binding to the sample
  • the invention provides a method for treating a tumor patient, comprising: detecting whether an EGFR protein of a G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutant form is present from In the patient's sample; if one of the mutations is present, an EGFR inhibitor (eg, Genf it inib and Erlotinib) is used for treatment.
  • an EGFR inhibitor eg, Genf it inib and Erlotinib
  • the present invention also provides a method of treating cancer patients (e.g., rectal cancer, papillary thyroid carcinoma, pancreatic cancer, esophageal cancer, prostate cancer, ovarian cancer, lung cancer).
  • the method of treatment comprises administering to a patient a drug comprising a monoclonal antibody of the present invention or an antigen-binding portion thereof in a composition.
  • the present invention further provides a method for treating melanoma, rectal cancer, thyroid cancer, pancreatic cancer, esophageal cancer, prostate cancer, ovarian cancer, breast cancer, lung cancer, or hematopoiesis using the monoclonal antibody of the present invention or an antigen binding site thereof as an agent. Tissue cancer.
  • the present invention encompasses a purified nucleic acid molecule which is composed of a nucleic acid sequence capable of encoding a heavy chain or a light chain or an antigen-binding portion of a monoclonal antibody which specifically binds to a mutant EGFR protein of the present invention. Further the invention encompasses a vector comprising the nucleic acid sequence; the vector is optimized to comprise an expression control sequence comprising a nucleic acid molecule. In one embodiment, the invention provides a host cell comprising the nucleic acid molecule. In another application, the invention provides a cell line capable of producing said monoclonal antibody or antigen binding site.
  • the present invention also encompasses a method of producing a monoclonal antibody or antigen binding site that specifically binds to a mutant without binding to a wild type EGFR protein.
  • the steps include: culturing a host cell or a cell strain referred to in the present invention under appropriate conditions; and purifying the antibody.
  • the present invention is based on the discovery that monoclonal antibodies specifically bind to mutant EGFR proteins.
  • monoclonal antibodies specifically bind to mutant EGFR proteins.
  • these antibodies bind very well to mutant EGFR proteins (eg, EGFR proteins with G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D, or V769L mutations).
  • These antibodies are effective in diagnosing or treating diseases such as cancer.
  • the antibody is particularly effective for detecting trace amounts of EGFR protein in biological samples.
  • the EGFR described in this patent refers to a gene or protein of the Epidermal Growth Factor Receptor (EGFR) (Hunter T and Cooper JA, Annu Rev Biochem. 54:897-930 (1985)). This gene or protein is also known as ErbB-1 or HER1.
  • EGFR Epidermal Growth Factor Receptor
  • the wild type EGFR protein sequence includes SEQ ID NO: 7, and the wild type EGFR protein encodes the mRNA sequence including SEQ ID NO: 8.
  • EGFR is a transmembrane receptor member of the epidermal growth factor receptor family on the cell surface and is a receptor tyrosine kinase. EGFR binds to extracellular epidermal growth factor (EGF), dimerizes and activates its own kinase activity, phosphorylating a range of downstream proteins within the cell, thereby transmitting extracellular signals into the cell.
  • EGF extracellular epidermal growth factor
  • Mutations of the EGFR protein include insertions, deletions, substitutions, and the like of one or more amino acids.
  • the invention encompasses monoclonal antibodies that specifically bind to a mutant EGFR protein but do not bind to a wild-type EGFR protein.
  • Antibody or "immunoglobulin Ig” refers to a tetramer that is linked by a disulfide bond by a heavy chain (H, about 50-70 kDa) and a light chain (L, about 25 kDa).
  • Light chain It can be a lambda light chain or a kappa light chain.
  • Heavy chains can be divided into ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , and the combination of different heavy and light chains determines that the type of antibody is IgM, IgD, IgG, IgA or IgE, respectively.
  • Each heavy chain (sometimes referred to as the H chain, or HC) contains a heavy chain variable region (also known as v H ) and a heavy chain constant region (also known as C H ).
  • the heavy chain constant region is comprised of three structures, namely the C H 1, C H 2 and C H 3.
  • Each light chain (sometimes also an L chain, or LC) also has a light chain variable region (also called V) and a light chain constant region (CL).
  • the light chain constant region contains only one structure and CL.
  • the variable and constant regions are linked by a "J" shaped structure of approximately 12 amino acids. There is also a "D" shaped area of about 3 amino acids inside the heavy chain.
  • the heavy chain variable region and the light chain variable region can be further divided into a hypervariable region, also called a complementarity determining region (CDR), and a slightly conserved framework region (FR) interspersed in the middle. These regions are arranged from the N terminal to the C terminal as FR1, CDR1, FR2, CDR2, FR3, CDR3, and FR4.
  • CDR complementarity determining region
  • FR slightly conserved framework region
  • the amino acid sequence of each structural region is ranked according to Kabat (Proteins of Immunological Interest, National Institutes of Health, Bethesda, MD (1987 and 1991)) and Chothia & Lesk (Chothia & Lesk, J. Mol. Biol. 196:901 -917 (1987); Chothia et al., Nature 342: 878-883 (1989)).
  • Antigen binding site refers to a stretch of antibody fragments on an antibody that specifically recognizes and binds to an antigen, such as a polypeptide fragment containing a particular mutation on an EGFR protein. It is currently believed that the antigen binding function of an antibody can be achieved by a partial fragment of a full length antibody.
  • the "antigen binding site" of an antibody is characterized by comprising: (1) a Fab fragment, a monovalent fragment comprising a VL, VH , CL, Ch1 domain; (2) an F(ab') 2 fragment, a bivalent fragment comprising connected via a disulfide bond of the hinge region Fab fragments; (3) - comprising a V H and C H 1 domain Fd fragments; (4) comprises a single arm of an antibody VL, V h Fv fragment of the domain; (5) a dAb fragment consisting of a VH domain (Ward et al., (1989) Nature 341:544-546); (6) an independent complementarity determining region (CDR).
  • a Fab fragment a monovalent fragment comprising a VL, VH , CL, Ch1 domain
  • an F(ab') 2 fragment a bivalent fragment comprising connected via a disulfide bond of the hinge region Fab fragments
  • V H and ⁇ of the F v fragment are encoded by different independent genes, but they can be recombined by synthesizing a link region to form a pair of V H and VL pairs inside the single-stranded protein.
  • Monovalent molecule also known as single-chain F v (scF v ) (Bird et al. Science 242:423-426 (1988) and Huston et al. Proc. Natl. Acad. Sci. USA 85:5879-5883 (1988) )).
  • scF v single-chain F v
  • Such single chain antibodies are also included within the scope of "antigen binding sites”.
  • a portion of antibodies can be obtained from full length antibodies by conventional techniques, such as papain or pepsin enzymatic digestion. They can also be obtained by standard DNA recombination techniques as described below.
  • the antibody of the present invention can be produced by immunizing a non-human animal (e.g., mouse, rabbit, rat or hamster) with an antigen derived from a human EGFR mutein. These antibodies can also be obtained by phage display technology or other known antibody preparation techniques.
  • the antigen may be a purified polypeptide or polypeptide, or may be a polypeptide or polypeptide expressed in a cell.
  • An antibody that specifically binds to the EGFR G719A mutein of the present invention can be passed through a polypeptide
  • ETEFKKIKVLASGAFGTV (SEQ ID NO: 1) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201301, and the name is hybridoma cell line M116.
  • An antibody that specifically binds to the EGFR G719C mutein of the present invention can be passed through a polypeptide
  • ETEFKKIKVLCSGAFGTV (SEQ ID NO: 2) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C2012127, and the name is hybridoma cell line M32_8.
  • An antibody that specifically binds to the EGFR 719S mutein of the present invention can be passed through a polypeptide
  • ETEFKKIKVLSSGAFGTV (SEQ ID NO: 3) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C2012118, and the name is hybridoma cell line M20_18.
  • An antibody that specifically binds to an EGFR D761Y mutein in the present invention can be passed through a polypeptide
  • EATSPKANKEILYEAYVM (SEQ ID NO: 4) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201303, and the name is hybridoma cell line M121ft l.
  • An antibody that specifically binds to the EGFR L858R mutein of the present invention can be passed through a polypeptide
  • KTPQHVKITDFGRAKLLG (SEQ ID NO: 5) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C2012125, and the name is hybridoma cell line M85_13.
  • An antibody that specifically binds to the EGFR L861Q mutein of the present invention can be passed through a polypeptide
  • ITDFGLAKQLGAEEKE (SEQ ID NO: 6) was immunized to obtain mice.
  • the hybridoma cells obtained by immunization with the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201315, and the name is hybridoma cell line M80_14.
  • An antibody that specifically binds to the EGFR A839T mutein of the present invention can be passed through a polypeptide
  • DRRLVHRDLTARNVLVKTP (SEQ ID NO: 7) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201302, and the name is hybridoma cell line M1 18ft7.
  • An antibody that specifically binds to the EGFR N826S mutein of the present invention can be passed through a polypeptide
  • IAKGMSYLEDRRLVHR (SEQ ID NO: 8) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization with the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201320, and the name is hybridoma cell line M1 17_10.
  • An antibody that specifically binds to the EGFR G863D mutein of the present invention can be passed through a polypeptide
  • ITDFGLAKLLDAEEKE (SEQ ID NO: 9) was immunized to obtain mice.
  • the hybridoma cells obtained by immunization with the polypeptide in the present invention have been deposited in the China Center for Type Culture Collection in accordance with the Budapest Agreement, and the accession number is CCTCC C201304, and the name is hybridoma cell line M120.
  • An antibody that specifically binds to the EGFR V769L mutein of the present invention can be passed through a polypeptide
  • EAYVMASLDNPHV (SEQ ID NO: 10) was obtained by immunizing mice.
  • the hybridoma cells obtained by immunization of the polypeptide in the present invention have been preserved in a typical Chinese culture in accordance with the Budapest Agreement. (2015) Center, the deposit number is CCTCC C201316, the name is hybridoma cell line M122ftl.
  • the invention further comprises a monoclonal antibody or antigen binding site thereof, which includes the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304 and CCTCC C201316.
  • the monoclonal antibodies of the present invention may only comprise hybrids with the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the heavy chain amino acid sequence or light chain amino acid sequence of the monoclonal antibody produced by the tumor cell may only comprise hybrids with the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the anti-EGFR antibody or antigen binding site of the invention comprises one or more of the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC The amino acid sequence of the heavy or light chain or CDR of the monoclonal antibody produced by the hybridoma cells of C201304 and CCTCC C201316.
  • the antibody or antigen binding site includes hybridoma cells from the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the amino acid sequences of all CDR1, CDR2 and CDR3 of the heavy and light chains of the produced monoclonal antibodies are included in the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the anti-EGFR antibodies or antigen binding sites of the invention are comprised by the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the amino acid sequence of the heavy or light chain variable region of the monoclonal antibody produced by the hybridoma cell are comprised by the accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the antibody or antigen binding site also contains hybridomas with accession numbers C CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304 and CCTCC C201316.
  • Cell produced The amino acid sequence of the heavy or light chain variable region of a monoclonal antibody.
  • the antibody or antigen binding site of the present invention is capable of specifically binding to the mutant EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D and EGFR V769L proteins, respectively, but not Binding to the wild-type EGFR protein (not bound at all or not bound to some extent).
  • the antibody or antigen binding site is capable of distinguishing between mutant and wild type human EGFR proteins. The specificity of this binding can be confirmed by known common detection methods, such as immunoblotting experiments.
  • the antibody is capable of specifically preferentially binding to a mutant EGFR protein, at least 10 fold, at least 20 fold, at least 50 fold, at least 100 fold, at least 250 fold, or at least for a mutant EGFR protein. It is 500 times stronger than its ability to bind to wild-type EGFR protein.
  • the antibody or antigen binding site of the invention specifically binds to the mutant EGFR protein at a dissociation equilibrium constant K D of at least 10 fold, at least 20 fold, at least 50 fold, at least 100 fold, at least 250 fold, At least 500 times, or at least 1000 times stronger than the dissociation equilibrium constant (K D ) for binding to the wild-type EGFR protein.
  • the dissociation equilibrium constant (K D ) can be measured by surface ion resonance or flow cytometry.
  • the antibody or antigen-binding site of the present invention may only bind to one EGFR mutein and not to other EGFR muteins (eg, EGFR G719A, EGFR G719C, EGFR 719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S) , EGFR G863D and one of EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR G719A protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR. Protein binding ability.
  • the antibody may only bind to the EGFR G719A protein without binding.
  • Other mutant EGFR proteins eg, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the ability of the antibody to specifically bind to the EGFR G719A protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the antibody may only bind to the EGFR G719C protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR G719C protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719A, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the antibody may only bind to the EGFR G719S protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR G719S protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719A, EGFR G719C, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the antibody may only bind to the EGFR D761Y protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L).
  • mutant EGFR proteins eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the ability of the antibody to specifically bind to the EGFR D761Y protein may be 10 times less, at least 20 times, at least 50 times, at least 100 times, at least 250 times, or at least 500 times stronger than any other mutant EGFR protein (eg EGFR G719A, EGFR G719C, EGFR G719S, EGFR L858R, EGFR) Binding ability of L861Q, EGFR A839T, EGFR N826S, EGFR G863D and EGFR V769L).
  • any other mutant EGFR protein eg EGFR G719A, EGFR G719C, EGFR G719S, EGFR L858R, EGFR
  • the antibody may only bind to the EGFR L861Q protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L) .
  • the ability of the antibody to specifically bind to the EGFR L861Q protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR A839T, EGFR N826S, EGFR G863D, and EGFR V769L.
  • the antibody may only bind to the EGFR A839T protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR N826S, EGFR G863D, and EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR A839T protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • EGFR G719A The binding capacity of proteins such as EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR N826S, EGFR G863D and EGFR V769L.
  • proteins such as EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR N826S, EGFR G863D and EGFR V769L.
  • the antibody may only bind to the EGFR N826S protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR G863D and EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR N826S protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Proteins eg EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR G863D And the binding ability of EGFR V769L).
  • the antibody may only bind to the EGFR G863D protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, and EGFR V769L).
  • the ability of the antibody to specifically bind to the EGFR G863D protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, and EGFR V769L.
  • the antibody may only bind to the EGFR V769L protein but not to other mutant EGFR proteins (eg, EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, and EGFR G863D).
  • the ability of the antibody to specifically bind to the EGFR V769L protein may be at least 10-fold, at least 20-fold, at least 50-fold, at least 100-fold, at least 250-fold, or at least 500-fold stronger than any other mutant EGFR.
  • Binding ability of proteins such as EGFR G719A, EGFR G719C, EGFR G719S, EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR N826S, and EGFR G863D.
  • the antibody or antigen binding site of the invention is capable of specifically binding to an EGFR polypeptide comprising SEQ ID NO: 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.
  • the antibody or antigen binding site of the present invention specifically binds to the CCTCC C20130 K CCTCC C2012127, CCTCC C20121 18, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304 or CCTCC C201316.
  • the present invention encompasses a nucleic acid sequence encoding a monoclonal antibody capable of specifically binding to a human mutant EGFR protein but not a wild type EGFR protein and an antigen binding site thereof.
  • Human mutation The EGFR proteins include: G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D, and V769L.
  • the nucleic acid molecule encodes only the heavy or light chain of the monoclonal antibody or antigen binding site.
  • the nucleic acid molecule simultaneously encodes the heavy and light chains of the monoclonal antibody and its antigen binding site.
  • the nucleic acid molecule encodes a monoclonal antibody produced by hybridoma cells with accession numbers CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the accounting can be a purified nucleic acid molecule.
  • a nucleic acid molecule encoding an antibody of the invention can be obtained from any source capable of producing the antibody.
  • nucleic acids can be obtained from hybridoma cells having the accession numbers CCTCC C201301, CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • a method of isolating and purifying a nucleic acid encoding an antibody is a known common technique. Specific methods can be found in the book: [United States] J. Sambrook D. W. Russell, Huang Peitang, etc., "Molecular Cloning Experiment Guide", Science Press, Third Edition, 2002.
  • the nucleic acid sequences of the heavy chain of the monoclonal antibody of the present invention may be composed of nucleic acid sequences encoding V H domains of an antibody of the present invention and encoded by an encoding of any other source of the antibody heavy chain constant region of The same frame coding sequence.
  • a nucleic acid molecule encoding a light chain of an anti-EGFR protein of the invention may also be in the same frame as the composition of the nucleic acid sequence encoding the V domain of an antibody of the invention and a light chain constant region encoding an antibody of any other source. Coding sequence.
  • a nucleic acid molecule encoding a heavy chain variable region ( VH ) and/or a light chain variable region (VL) is transformed into a full length antibody encoding gene.
  • the nucleic acid sequences encoding the V H or VL domains are respectively inserted into the already containing heavy chain constant region (C H) or light chain of the expression vector constant region (CL) in to construct a full Long antibody gene. Fragments of a full-length antibody gene fragment and the C H CL is connected so created in the carrier, and / or Fragment encoding the VL fragment encoding the V H are connected in the carrier.
  • the encoding v H and / or V domain nucleic acid sequence fragment, respectively by the above recombinant nucleic acid technology is coupled to a fragment encoding c H and / or code C.
  • Genes encoding the constant domains of human immunoglobulin heavy and light chains are known. See the book Kabat et al. for details.
  • a nucleic acid molecule encoding a full-length heavy chain and/or a light chain can be expressed in a cell line into which the EGFR antibody is introduced and purified.
  • nucleic acid molecules can also be used to produce chimeric antibodies, bispecific binding antibodies, single chain antibodies, immunoadhesives, double-headed antibodies, mutant antibodies, and antibody derivatives. If the nucleic acid molecule is derived from a non-human, non-transgenic animal, the nucleic acid molecule may also be used to effect humanization of the antibody.
  • the present invention also encompasses the insertion of a nucleic acid molecule encoding an antibody heavy chain, a light chain, or both an EGFR antibody of the present invention or an antigen binding site thereof.
  • the vector may be suitable for expressing an antibody of the invention or an antigen binding site thereof in a prokaryotic host cell, such as a yeast cell, an insect cell or a mammalian cell.
  • Common mammalian cells including many immortal cell lines, can be used as expression hosts. These cell lines include, but are not limited to, Chinese hamster ovary cells (CH0), NS0 cells, SP2 cells, HEK293T cells, 293 Free styl e (Inv i trogen), NIH3T3 cells, HeLa cells, baby hamster kidney cells (BHK), African green monkey kidney cells, human liver cancer cells (such as HepG2), and A549 cells. Other cells that can be used for expression are insect cells, including sf9 and sf2 1 cells. Plant host cells include: tobacco, Arabidopsis thaliana, duckweed, corn, wheat, sauerkraut, rice-derived cells. Bacterial host cells include E. coli and actinomycetes. Yeast hosts include fission yeast, Saccharomyces cerevisiae, Pichia pastoris.
  • glycosylation patterns can be obtained using different cell lines under different culture conditions, or using antibodies expressed by transgenic animals. However, regardless of the glycosylation pattern, all of the antibodies encoded by the nucleic acid or the sequence containing the nucleic acid are within the scope of the invention.
  • Chimeric and humanized antibodies The chimeric antibody referred to herein is characterized by having an antibody composed of domains of two or more different antibodies.
  • the variable region domain of a chimeric antibody may be derived from a hybridization of the CCTCC C20130 K CCTCC C2012127, CCTCC C20121 18, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the humanized antibody of the antibody of the present invention is a CDR domain of an antibody derived from a mouse of the present invention inserted into a human receptor antibody.
  • the FR and constant regions of chimeric antibodies are derived from humans.
  • This humanized EGFR antibody containing the human FR region has less immunogenicity in humans than chimeric antibodies derived from humans only in the constant region.
  • the CDR sequences of the humanized antibody may be derived from the accession numbers CCTCC C20130 K CCTCC C2012127, CCTCC C20121 18, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320, CCTCC C201304, and CCTCC C201316.
  • the present invention also encompasses an antibody against which the anti-EGFR monoclonal antibody or antigen-binding site thereof described above is modified by at least one additional molecule or group.
  • the modification can be for purifying or detecting the antibody, and/or enhancing its therapeutic effect.
  • an antibody or antigen binding site can be linked to a detection reagent, tag, cytotoxic agent, drug molecule, and/or protein or polypeptide for attachment to the antibody or antigen binding site thereof to another molecule (eg, avidin) A combination of a core region, or a polyhistidine tag).
  • Common detection labels include, but are not limited to: radioisotopes (eg 125 I, m I, 35 S or 3 ⁇ 4), fluorescent complexes (eg fluorescein, dichlorotriazine fluorescein, fluorescein isothiocyanate, rhodamine , 5-dimethylamino-1-naphthalenesulfonyl chloride, fluorescein PE, rare earth luminescent, umbelliferone, dansyl chloride), and enzymes (eg horseradish peroxidase, 0-galactosidase, beta _galactosidase, luciferase, alkaline phosphatase, glucose oxygen Chemical enzyme, acetylcholinesterase).
  • radioisotopes eg 125 I, m I, 35 S or 3 ⁇ 4
  • fluorescent complexes eg fluorescein, dichlorotriazine fluorescein, fluorescein isothiocyanate,
  • the antibody or portion thereof of the invention may be labeled with biotin, or may have been shown to be conjugated to another reporter molecule (eg, a leucine zipper pairing region, a secondary antibody binding site, a metal collection domain, Epitope tag) The recognized epitope of the polypeptide.
  • another reporter molecule eg, a leucine zipper pairing region, a secondary antibody binding site, a metal collection domain, Epitope tag
  • any of the antibodies or portions thereof may be modified with polyvinyl alcohol (PEG), methyl or ethyl or a sugar group.
  • One aspect of the present invention is to use the anti-EGFR antibody or antigen-binding site thereof as a cancer diagnostic reagent.
  • Cancer refers to any type of malignancy, including cancer at any stage and level.
  • Specific examples of cancers that may be diagnosed with the monoclonal antibodies of the present invention include, but are not limited to: lung cancer, non-small cell lung cancer, rectal cancer, colon cancer, papillary thyroid cancer, pancreatic cancer, esophageal cancer, prostate cancer, ovarian cancer, colloid Tumor, brain cancer.
  • Diagnosis includes detecting the extent of cancer development, confirming the presence of cancer, or typing or classifying cancer.
  • the invention may provide a method of diagnosing cancer in a target, the method comprising: contacting a biological sample from a detection target with an anti-EGFR monoclonal antibody of the invention; detecting the antibody or a portion thereof Whether the sample binds; if the antibody is combined with the sample, it indicates that the subject is cancer, or there is a risk of developing cancer.
  • the sample to be tested may be blood, serum, lymph, tissue (e.g., puncture or formaldehyde and paraffin fixed coated sections).
  • the binding of the antibody to the sample can be detected using common known techniques, including but not limited to: ELISA, RIA, flow cytometry, immunocytochemistry, immunohistochemistry, immunofluorescence, immunoblotting, or co-immunoprecipitation.
  • Anti-EGFR antibodies or portions thereof can also be directly labeled with a detectable label. If the antibody is not labeled, a secondary antibody or other molecule capable of binding to the EGFR antibody and capable of being detected can be used.
  • a specific secondary antibody is capable of specifically binding to a primary antibody of a particular species and subtype. For example, if the anti-EGFR antibody is a mouse IgG, the secondary antibody must be a labeled anti-mouse IgG antibody.
  • proteins capable of binding to an antibody include, but are not limited to, Protein A and Protein G. They all come in a variety of commercial forms. For example, Protein A and Protein G from Pierce.
  • Molecules suitable for labeling antibodies or secondary antibodies include, but are not limited to: enzymes, prosthetic groups, fluorescent materials, luminescence Materials, magnetic materials and radioactive materials (see above).
  • the antibodies of the invention, or portions thereof can be provided in a kit comprising a detection antibody binding reagent.
  • Anti-EGFR antibodies can also be used to examine the progression of a cancer patient and then decide which treatment regimen to take. For example, in the accompanying test of a treatment regimen. Medical staff may determine the optimal treatment for a particular patient based on the results of EGFR mutations.
  • the treatment regimen can be surgery, radiation therapy, medication (including chemotherapy and targeted therapy), or a combination of multiple treatments.
  • the invention includes a method of treating a cancer patient, comprising: examining whether a biological sample from a patient carries an EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutation If the mutation is present, the patient is treated with an EGFR inhibitor.
  • the EGFR inhibitor may be an anti-sense RNA, a small interfering RNA (s iRNA), a microRNA (miRNA) drug, or an anti-EGFR monoclonal antibody drug.
  • s iRNA small interfering RNA
  • miRNA microRNA
  • the detection of the presence of EGFR mutations prior to targeted therapy to patients with anti-EGFR drugs is of great interest for treatment.
  • the present invention also provides the use of an antibody and antigen-binding site thereof as a therapeutic drug, including the use of the antibody of the present invention or a part thereof as a therapeutic human, and the use of the antibody or a part thereof as an application for the manufacture of a medicament for treating human cancer.
  • human cancers include rectal cancer, papillary thyroid cancer, pancreatic cancer, esophageal cancer, prostate cancer, ovarian cancer, and lung cancer. Detailed cancer types can also be found in the description above.
  • a medical professional is administered an antibody or moiety of the invention that is capable of achieving an effective dose for a particular disease, typically a chimeric or humanized antibody or moiety, thereby slowing or treating the disease, preventing cancer. Transfer or further development.
  • the mode of administration of the antibody can be, for example, injection or infusion.
  • the dose of the antibody or part can be determined by the medical staff, and the range is from 0.1 to 100 mg/kg body weight, more preferably from 0.5 to 50 mg/kg body weight, more preferably from 1 to 20 mg/kg body weight. More preferably, it is 1 to 10 mg/kg body weight.
  • the effect of the treatment can be illustrated by monitoring, for example, the extent to which the tumor is reduced in size.
  • the components of the therapeutic agents of the invention may include an acceptable pharmaceutical carrier in addition to the monoclonal antibodies or portions thereof.
  • An acceptable pharmaceutical carrier is characterized by being a solvent, a dispersing agent, a coating agent, an antibacterial agent and an antifungal agent, an osmotic balance agent and an adsorption retardant, which are characterized by physiological compatibility.
  • preferred carriers include osmotic balance agents such as saccharides, polyols such as mannitol, sorbitol, sodium chloride components.
  • Other acceptable pharmaceutical materials include humectants or minor amounts of adjuvants such as wetting agents, emulsifiers, protectants or buffers which increase the shelf life or effectiveness of the antibody.
  • the anti-EGFR antibodies of the invention, or portions thereof, are mixed with one or more of a therapeutic, diagnostic, or prophylactic agent.
  • Therapeutic agents include, but are not limited to, anti-EGFR antibodies that bind different targets with different fine specific differences, and EGFR inhibitors, for example, the inhibitor may be cetuximab (cetuxmab), panitumumab
  • Therapeutically effective dose refers to the amount of an effective drug to achieve a therapeutic effect at a certain course of treatment and dosage.
  • the therapeutically effective dose of the antibody and its antigen binding portion may vary depending on various factors such as disease progression, age, sex, body weight, and the ability of the antibody or antibody portion to be responsive within the individual.
  • the therapeutically effective dose also encompasses the beneficial effects of the antibody or antigen binding site over any toxic or detrimental effects.
  • Preventive effective amount refers to the amount of effective drug to achieve a preventive effect at a certain course of treatment and dosage. Usually, since the prophylactic agent is used before or during the disease, the prophylactically effective amount may be less than the therapeutically effective amount.
  • Figure 1 shows an immunoblotting assay map of antibodies produced by a cell line with the accession number CCTCC C201301 that specifically binds to the EGFR G719A protein but does not bind to the wild-type EGFR protein.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains E. coli expression
  • Figure 2 shows an immunoblotting assay map of antibodies produced by a cell line with the accession number CCTCC C2012127 that specifically binds to the EGFR G719C protein but does not bind to the wild-type EGFR protein.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR G719C protein expressed by E. coli;
  • Figure 3 shows that the antibody produced by the cell line with the accession number CCTCC C20121 18 specifically binds to the EGFR G719S protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR G719S protein expressed by E. coli;
  • Figure 4 shows that the antibody produced by the cell line with the accession number CCTCC C201303 specifically binds to the EGFR D761Y protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR D761Y protein expressed by E. coli;
  • Figure 5 shows that the antibody produced by the cell line with the accession number CCTCC C2012125 specifically binds to the EGFR L858R protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR L858R protein expressed by E. coli;
  • Figure 6 shows that the antibody produced by the cell line with the accession number CCTCC C201315 specifically binds to the EGFR L861Q protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR L861Q protein expressed by E. coli;
  • Figure 7 shows that the antibody produced by the cell line with the accession number CCTCC C201302 specifically binds to the EGFR A839T protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR A839T protein expressed by E. coli;
  • Figure 8 is a graph showing the immunoblotting of an antibody produced by a cell line with the accession number CCTCC C201320 specifically binding to the EGFR N826S protein but not binding to the wild type EGFR protein.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains E. coli expression Mutant EGFR N826S protein;
  • Figure 9 shows that the antibody produced by the cell line with the accession number CCTCC C201304 specifically binds to the EGFR G863D protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR G863D protein expressed by E. coli;
  • Figure 10 shows that the antibody produced by the cell line with the accession number CCTCC C201316 specifically binds to the EGFR V769L protein, but does not bind to the wild-type EGFR protein immunoblotting assay.
  • Lane 1 contains the wild type EGFR protein expressed by E. coli.
  • Lane 2 contains the mutant EGFR V769L protein expressed by E. coli;
  • Figure 1 1 shows the immunofluorescence assay of the antibody produced by the cell line with CCTCC C201301 specifically binding to the EGFR G719A protein but not the wild-type EGFR protein.
  • the green fluorescent protein (GFP) signal indicates the expression of wild-type EGFR (top) and mutant EGFR G719A proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR G719A protein (below);
  • Figure 12 shows an immunofluorescence assay map of an antibody produced by a cell line with the accession number CCTCC C2012127 that specifically binds to the EGFR G719C protein but does not bind to the wild-type EGFR protein.
  • the green fluorescent protein (GFP) signal indicates the expression of wild-type EGFR (top) and mutant EGFR G719C protein (lower), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR G719C protein (below);
  • Figure 13 shows an immunofluorescence assay map of antibodies produced by a cell line with the accession number CCTCC C20121 18 that specifically binds to the EGFR G719S protein but does not bind to the wild-type EGFR protein.
  • the green fluorescent protein (GFP) signal indicates the expression of wild-type EGFR (top) and mutant EGFR G719S proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR G719S protein (below);
  • Figure 14 shows an immunofluorescence assay map of an antibody produced by a cell line with the accession number CCTCC C201303 specifically binding to the EGFR D761Y protein but not binding to the wild type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate wild-type EGFR (top) and mutant EGFR D761Y, respectively Expression of protein (below).
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR D761Y protein (below);
  • Figure 15 shows the immunofluorescence assay of antibodies produced by a cell line with the accession number CCTCC C2012125 that specifically binds to the EGFR L858R protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR L858R proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR L858R protein (below);
  • Figure 16 shows the immunofluorescence assay of antibodies produced by a cell line with the accession number CCTCC C201315 that specifically binds to the EGFR L861Q protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR L861Q proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR L861Q protein (below);
  • Figure 17 shows the immunofluorescence assay of antibodies produced by a cell line with the accession number CCTCC C201302 that specifically binds to the EGFR A839T protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR A839T proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR A839T protein (below);
  • Figure 18 shows an immunofluorescence assay map of antibodies produced by a cell line with the accession number CCTCC C201320 that specifically binds to the EGFR N826S protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR N826S proteins (below), respectively.
  • the red fluorescent signal is indicative of binding of the antibody to the EGFR protein and occurs only in cells expressing the EGFR N826S protein (below);
  • Figure 19 shows an immunofluorescence assay map of an antibody produced by a cell line with the accession number CCTCC C201304 that specifically binds to the EGFR G863D protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR G863D proteins (below), respectively.
  • the red fluorescent signal is capable of indicating the binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR G863D protein (below);
  • Figure 20 shows an immunofluorescence assay map of an antibody produced by a cell line with the accession number CCTCC C201316 that specifically binds to the EGFR V769L protein but does not bind to the wild-type EGFR protein.
  • Green fluorescent protein (GFP) signals indicate expression of wild-type EGFR (top) and mutant EGFR V769L proteins (below), respectively.
  • the red fluorescent signal is capable of indicating binding of the antibody to the EGFR protein and appears only in cells expressing the EGFR V769L protein (below).
  • a polypeptide containing an amino acid sequence of an EGFR mutein is obtained by synthesis. Detailed polypeptide sequences are listed in the table below, and the mutated amino acids relative to the wild-type protein are underlined:
  • Each synthetic peptide was coupled to a succinylated keyhole limpet hemocyanin (KLH) to immunize mice and to enhance the immune effect by mixing Freund's adjuvant.
  • KLH succinylated keyhole limpet hemocyanin
  • Anti-EGFR G719A, G719C, G719S, D761Y, L858R immunized with the above polypeptides Spleen cells from L861Q mice were fused to mouse myeloma SP2/0 cells via polyvinyl alcohol (PEG), respectively. Positive clones were screened by ELISA. Positive cloned cells were injected into the peritoneal cavity of mice of the same strain to produce ascites. The antibody was purified from ascites.
  • Hybridoma cells produced by immunizing mice with a polypeptide containing a mutated EGFR protein are deposited at the China Center for Type Culture Collection (CCTCC, Wuhan University, Wuhan, Hubei province, China, 430072).
  • CTCC China Center for Type Culture Collection
  • the cDNA sequence encoding the wild type of EGFR and the EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutant protein was cloned into 6 sets of ammonia.
  • the constructed plasmid was transformed into E. coli BL21 (DE3) strain and transformed The bacteria were spread on a LB medium plate containing kanamycin and cultured at 37 °C.
  • Monoclonal colonies were picked from the plates and placed in an Erlenmeyer flask containing 500 ml of LB medium containing kanamycin. 0 ⁇ The flask was placed in a shaker at 37 ° C to 0D600 close to 1.0. Then, 0.2 mM IPTG was added to the Erlenmeyer flask to induce incubation for 3 hours at 37 °C. The cultured bacteria were collected by centrifugation, and then lysate (20 mM Tris, 100 mM NaCl, 1% TritonTM X-100, and protease inhibitor) was added. The lysed bacterial solution was centrifuged at a speed of 12,000 g for 30 minutes, and the supernatant was collected.
  • the supernatant was added to a nickel column and purified to yield pure EGFR protein following the nickel column manufacturer's instructions. Then loaded onto 2 X SDS 0. 1 ⁇ ⁇ EGFR proteins were each purified with an equal volume of buffer were mixed and heated at 95 ° C 10 min.
  • the cDNA sequence encoding the EGR wild type and the EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutant protein was cloned into the mammalian expression vector pCNDA3.0. And fused with a sequence encoding green fluorescent protein (GFP) to form an open reading frame. The constructed plasmid was transformed into DH5a E. coli to amplify and extract the plasmid.
  • GFP green fluorescent protein
  • HEK293T cells were plated at a density of 30% into a 24-well cell culture plate, and placed in a 5% (0 2 incubator) at 37 ° C. Then it contained 0.5 ⁇ g ⁇ expression of each
  • the EGFR protein plasmid was transfected into HEK293T cells by standard calcium phosphate transfection. The transfected cells were further cultured for 24 hours. The transfected cells were then collected, and 20 ⁇ M of cell lysate was added to each well of the cells. Place on for 10 minutes. Then centrifuge the cells for 10 minutes at 12,000 rpm and collect the supernatant. Take 10 ⁇ M of each cell lysate supernatant, mix with an equal volume of 2 X SDS loading buffer, and Heat at 95 °C for 10 minutes.
  • the PVDF membrane was rinsed three times with TBS buffer containing 0.1% Tween®-20, and rinsed for 5 minutes each time. The membrane was then placed in a solution containing the ECL substrate and blotted with film in a dark room. Wash, develop, fix.
  • Figure 1 Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 9 and Figure 10 show the anti-EGFR G719A, G719C, G719S produced in Example 1 in an immunoblot experiment.
  • D761Y, L858R, L861Q, A839T, N826S, G863D or V769L monoclonal antibodies can specifically bind to the EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutant proteins, respectively, but do not bind Wild-type EGFR protein, and whether the protein is expressed in E. coli or expressed in mammalian cells.
  • Example 3 Example 3
  • the pCDNA3.0 plasmid capable of expressing the wild type with GFP tag and EGFR G719A, G719C, G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L mutant EGFR protein was constructed according to the method of Example 2. Prior to transfection, sterile-treated slides were placed in 24-well cell culture plates, and HEK293T cells were plated at 30% density in 5% C0 2 incubator at 37 °C. to cultivate. Calcium phosphate transfection mixture containing 0. 5 ⁇ ⁇ EGFR expression plasmids using standard protein each transfected into HEK293T cells.
  • the transfected cells were further cultured for 36 hours. The cells were then fixed with 3.7% paraformaldehyde for 10 minutes. Cells were treated with 1% TritonTM X-100 in PBS buffer for 10 minutes to increase their permeability. The treatment was then blocked with PBS containing 5% of bovine serum for 10 minutes. These treated cells were then each placed in a buffer containing the anti-EGFR monoclonal antibody produced in Example 1 and incubated at 4 ° C for 16 hours. The antibody was then removed and the cells were rinsed three times with PBS buffer for 5 minutes each time. The anti-mouse secondary antibody labeled with a fluorescent illuminant was then incubated for 30 minutes.
  • DAPI dye was added to the secondary antibody solution to stain the nuclei.
  • the secondary antibody was removed and rinsed again three times with PBS buffer for 5 minutes each time. Then remove the glass slide with the cells attached and fix it to the load. Slide on the slide and seal with nail polish. The cells were observed under a fluorescence microscope and photographed.
  • Figure 1 1, Figure 12, Figure 13, Figure 14, Figure 15, Figure 16, Figure 17, Figure 18, Figure 20 and Figure 20 show the anti-EGFR G719A, G719C produced in Example 1 in an immunofluorescence experiment.
  • the G719S, D761Y, L858R, L861Q, A839T, N826S, G863D or V769L monoclonal antibodies are capable of specifically binding to the anti-EGFR G719A expressed in mammalian cells,

Abstract

本发明公开了特异性识别EGFR突变蛋白的单克隆抗体、制备方法及其应用,属于生物科学和药物载体领域。利用本发明的方法制备出的三种单克隆抗体分别可以特异性识别十种EGFR G719A、EGFR G719C、EGFR G719S、EGFR D761Y、EGFR L858R、EGFR L861Q、EGFR A839T、EGFR N826S、EGFR G863D以及EGFR V769L突变蛋白。这十种单克隆抗体可以用于检测动物或者人体组织中的EGFR蛋白是否含有G719A、G719C、G719S、D761Y、L858R、 L861Q、A839T、N826S、G863D或者V769L突变,能为临床上的多种癌症的诊断和治疗提供依据。

Description

特异性识别 EGFR突变蛋白的单克隆抗体、 制备方法及其应用 技术领域
本发明属于生物科学和药物载体领域,特别涉及特异性识别 EGFR突变 蛋白的单克隆抗体、 制备方法及其作为诊断和治疗试剂的应用。 背景技术
EGFR蛋白 (Epidermal Growth Factor Receptor , 表皮生长因子受体, 也称为 ErbB-1或者 HERl)是细胞表面的表皮生长因子受体家族的跨膜受体 成员。 EGFR与细胞外的表皮生长因子 (EGF ) 结合, 从而将细胞外的信号 传导到细胞内。 EGFR蛋白的突变在多种人类癌症, 例如肺癌、 ***癌、 直 肠癌、 乳腺癌中都存在 ( Paez JG et al . , Science, 304 (5676): 1497-500 (2004) ) 。这些突变导致 EGFR蛋白的持续激活, 进而促进细胞的增殖转化 和癌细胞生长。 常见的 EGFR突变蛋白有 G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D和 V769L。
针对 EGFR突变蛋白的抑制剂药物已经上市, 包括易瑞沙™ ( Iressa™, 化学名 Genf itinib )、特罗凯™ ( Tarceva™,化学名 Erlotinib )等(Mayumi Onol and Michihiko Kuwano, Clin. Cancer Res. 12: 7242 (2006) ) 。 这些 抑制剂药物特异性针对突变的 EGFR蛋白, 因此在使用之前, 需要用一种能 够特异性结合突变的 EGFR蛋白但是不结合野生型 EGFR蛋白的抗体来检测 该病人是否带有 EGFR突变(Pal l i s AG et al ., J. Cancer. 105 (1) : 1-8. (2011) )。这种抗体可以被用来快速检测少量的取自病人的样品,用于诊断 癌症。 能够特异性结合 EGFR突变蛋白的抗体也是治疗癌症所迫切需要的。 发明内容
本发明的目的是为解决上述问题而提供了分别特异性地识别 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D和 V769L突变体蛋白的六种单克隆抗体、 制备方法及其应用。 利用本发明的 方法制备出的单克隆抗体能够分别特异性地识别 G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D和 V769L突变体蛋白, 而不 识别野生型 EGFR蛋白。
在一些操作实例中,所述的特异性识别 EGFR突变蛋白的单克隆抗体或 者抗原结合部位, 其特征在于, 由一条重链和一条轻链组成; 重链和轻链 的 CDR1、 CDR2以及 CDR3的氨基酸序列分别是由中国典型培养物保藏中心 ( CCTCC ) 保藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302 , CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞产生的单克隆 抗体的 CDR1、 CDR2以及 CDR3的氨基酸序列决定。在进一步的操作实例中, 所述的特异性识别 EGFR突变蛋白的单克隆抗体或者抗原结合部位,其特征 在于, 由分别包含所述杂交瘤细胞所产生的单克隆抗体的重链和轻链的可 变区域的氨基酸序列的一条重链和一条轻链组成。 在更进一步的操作实例 中, 抗体或者抗原结合部位包含上述杂交瘤细胞所产生的单克隆抗体的重 链和轻链可变区的氨基酸序列。
本发明的单克隆抗体可以是一种人源化的或者嵌合型的抗体。 在某些 操作实例中, 这种单克隆抗体是 IgG。
在一方面, 本发明包括保存在中国典型培养物保藏中心 (CCTCC ) 保 藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302 , CCTCC C201320 , CCTCC C201304以及 CCTCC C201316的杂交瘤细胞。
本发明包括一种含有所述单克隆抗体或者抗原结合部位的药物或者 可用于药物的载体。 本发明还包括一种含有本发明中提到的单克隆抗体或 者其抗原结合部位诊断试剂盒。
在一些应用实例中, 本发明能够提供一种癌症诊断的方法 (例如, 肺 癌, 非小细胞肺癌, 直肠癌, 结肠癌, ***状甲状腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 胶质瘤, 脑癌) , 其主要步骤包括: 用本发明所述的 单克隆抗体接触来自于检测目标的生物学样本; 检测抗体或者其部分与样 本是否结合; 如果抗体与样本存在结合则表明被检测对象是癌症, 或者存 在发展成癌症的风险。
在另外的应用实例中, 本发明提供一种***病人的方法, 包括: 检测 G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D 或者 V769L突变形式的 EGFR蛋白是否存在于来自于病人的样本中;如果其 中一个突变存在,则使用一种 EGFR抑制剂(例如 Genf it inib和 Erlotinib ) 进行治疗。 本发明还提供一种治疗癌症病人 (例如, 直肠癌, ***状甲状 腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 肺癌) 的方法。 该治疗方法 包括给予病人一种组成成分中含有本发明的单克隆抗体或者其抗原结合部 分的药物。 本发明进一步提供一种使用本发明所述单克隆抗体或者其抗原 结合部位作为药剂治疗黑色素癌, 直肠癌, 甲状腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 乳腺癌, 肺癌, 或者造血组织癌。
本发明包括一种纯化的核酸分子, 其组成为能够编码本发明中的特异 性结合突变 EGFR蛋白的的单克隆抗体的重链或者轻链或者抗原结合部分 的核酸序列。 进一步本发明包括含有该核酸序列的载体; 该载体优化为含 有包括可以联系到该核酸分子的表达调控序列。 在一种应用实例中, 本发 明提供一种含有该核酸分子的宿主细胞。 在另一个应用实例中, 本发明提 供一种能够产生所述的单克隆抗体或者抗原结合部位的细胞株。 本发明还 包括一种生产特异性结合突变型而不结合野生型 EGFR蛋白的单克隆抗体 或者抗原结合部位的方法。 其步骤包括: 在适当的条件下培养宿主细胞或 者本发明中提到的细胞株; 纯化所述的抗体。
本发明基于单克隆抗体特异性结合突变型的 EGFR蛋白的发现。 我们 发现这些抗体能够非常好地优先结合突变的 EGFR蛋白 (例如带有 G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L 突变的 EGFR蛋白) 。这些抗体能够有效地诊断或者治疗癌症等疾病。 这些 抗体特别能够有效地检测生物样品中微量的 EGFR蛋白。
EGFR
本专利所描述的 EGFR是指表皮生长因子受体 (Epidermal Growth Factor Receptor, EGFR) 的基因或者蛋白(Hunter T and Cooper JA, Annu Rev Biochem. 54:897-930 (1985))。 该基因或者蛋白也被称为 ErbB-1或 者 HER1。 野生型的 EGFR蛋白序列包括 SEQ ID N0:7, 野生型 EGFR蛋白的 编码 mRNA序列包括 SEQ ID NO: 8。
EGFR是细胞表面的表皮生长因子受体家族的跨膜受体成员,是一种受 体酪氨酸激酶。 EGFR与细胞外的表皮生长因子 (EGF) 结合, 发生二聚化 并激活自身的激酶活性, 磷酸化细胞内的一系列下游蛋白, 从而将细胞外 的信号传导到细胞内。
EGFR蛋白的突变型式包括一个或者多个氨基酸的***、删除、替换等。 本专利所描述的 EGFR G719A突变指的是第 719位的甘氨酸 (G) 被丙氨酸 (A) 替换的突变; EGFR G719C指的是第 719位的甘氨酸 (G) 被半胱氨酸 (C)替换的突变; EGFR G719S指的是第 719位的甘氨酸(G)被丝氨酸(S) 替换的突变; EGFR D761Y指的是第 761位的天冬氨酸 (D) 被酪氨酸 (Y) 替换的突变; EGFR L858R指的是第 858位的亮氨酸 (L) 被精氨酸 (R) 替 换的突变; EGFR L861Q指的是第 861位的亮氨酸 (L) 被谷氨酰胺 (Q) 替 换的突变; EGFR A839T指的是第 839位的丙氨酸 (A) 被苏氨酸 (T) 替换 的突变; EGFR N826S指的是第 826位的天冬酰胺 (N) 被丝氨酸 (S) 替换 的突变; EGFR G863D指的是第 863位的甘氨酸 (G) 被天冬氨酸 (D) 替换 的突变; EGFR V769L指的是第 769位的缬氨酸 (V) 被谷亮氨酸 (L) 替换 的突变。
抗体与抗原结合部位
本发明包括特异性结合突变型 EGFR蛋白但是不结合野生型 EGFR蛋白 的单克隆抗体。 "抗体" 或者 "免疫球蛋白 Ig" 指的是由重链 (H, 大约 50-70 kDa) 和轻链 (L, 大约 25 kDa) 通过二硫键链接成的四聚体。 轻链 可以是 λ 轻链或者 κ 轻链。 重链可以分为 μ、 δ、 γ、 α、 ε, 不同重链和 轻链的组合共同决定抗体的类型分别是 IgM、 IgD、 IgG、 IgA或者 IgE
(Fundamental Immunology Ch. 7, Paul, W., ed., 2nd ed. Raven Press, N. Y. (1989) ) 。
每条重链 (有时称为 H链, 或者 HC) 都含有一个重链可变区 (也叫 vH) 和一个重链恒定区 (也叫 CH) 。 重链恒定区由三个结构与组成, 分别 为 CH1、 CH2和 CH3。 每条轻链 (有时也成为 L链, 或者 LC) 也有一个轻链 可变区 (也叫 V ) 和轻链恒定区 (CL) 。 轻链恒定区只含有一个结构与 CL, 在轻链和重链内部,可变区和恒定区通过一个大约 12 个氨基酸左右的" J" 形状的结构链接起来。在重链内部还有一个 3个氨基酸左右的" D"形区域。 重链可变区和轻链可变区可以进一步被分为超可变区, 也叫互补决定区 (CDR) 以及穿插中间的略微保守的框架区域 (FR) 。 这些区域以此从 N 端往 C端排列为 FR1、 CDR1、 FR2、 CDR2、 FR3、 CDR3、 FR4。 每个结构区域 的氨基酸序列排序是根据 Kabat (Proteins of Immunological Interest, National Institutes of Health, Bethesda, MD (1987 and 1991) ) 禾口 Chothia & Lesk (Chothia & Lesk, J. Mol. Biol. 196:901-917 (1987); Chothia et al., Nature 342:878-883 (1989) )的研究结果分类的。
本发明的内容之一是特异性结合突变型 EGFR蛋白的的单克隆抗体的 抗原结合部位。 "抗原结合部位" 是指抗体上使其具有特异性识别并结合 抗原(例如 EGFR蛋白上一段含有特定突变的多肽片段)的功能的一段抗体 片段。 目前认为, 抗体的抗原结合功能可以通过全长抗体的部分片段来实 现。 抗体的 "抗原结合部位" 的特征在于包含: (1) 一个 Fab片段, 一个 包含 VL、 VH、 CL、 Ch1结构域的单价片段; (2) —个 F(ab' )2片段, 一个含 有通过铰链区的的二硫键连接起来的 Fab片段的二价片段; (3)—个包含 VH和 CH1结构域的 Fd片段; (4) 抗体单臂包含一个 VL、 Vh结构域的 Fv片 段; (5) —个由 VH结构域组成的 dAb片段 (Ward et al., (1989) Nature 341:544-546) ; (6) 一个独立的互补决定区 (CDR) 。 更进一步地, 尽管 Fv片段的两个结构域 VH和 ^是由不同的独立基因编码的, 但是可以用基因 重组的方式通过合成一个链接区域将它们连接起来, 形成由单链蛋白内部 的 VH和 VL配对成单价分子, 也称为单链 Fv (scFv) (Bird et al. Science 242:423-426 (1988) and Huston et al. Proc. Natl. Acad. Sci. USA 85:5879-5883 (1988) ) 。 这种单链抗体也包括在 "抗原结合部位" 的范围 内。 抗体的一部分, 比如 Fab和 F(ab' )2片段, 可以从全长的抗体通过常 规的技术, 比如木瓜酶 (papain) 或者胃蛋白酶(Pepsin)酶消化的方法获 得。 它们也可以通过下面描述的标准的 DNA重组技术获得。
抗 EGFR抗体及其抗原结合部位
本发明的抗体可以用来自于人类 EGFR突变蛋白的抗原免疫非人类的 动物 (例如, 小鼠、 兔子、 大鼠或者仓鼠) 来制备。 这些抗体也可以通过 噬菌体展示技术或者其它的已知的抗体制备技术获得。 抗原可以是纯化的 多聚多肽或者多肽, 也可以是在细胞内表达的多聚多肽或者多肽。
特定疾病相关的突变的 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L。
本发明中特异性结合 EGFR G719A突变蛋白的抗体可以通过多肽
ETEFKKIKVLASGAFGTV (SEQ ID NO: 1)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C201301, 名称为杂交瘤细胞株 M116。
本发明中特异性结合 EGFR G719C突变蛋白的抗体可以通过多肽
ETEFKKIKVLCSGAFGTV (SEQ ID NO: 2)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C2012127, 名称为杂交瘤细胞株 M32_8。
本发明中特异性结合 EGFR 719S突变蛋白的抗体可以通过多肽
ETEFKKIKVLSSGAFGTV (SEQ ID NO: 3)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C2012118, 名称为杂交瘤细胞株 M20_18。 本发明中特异性结合 EGFR D761Y突变蛋白的抗体可以通过多肽
EATSPKANKEILYEAYVM (SEQ ID NO: 4)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C201303 , 名称为杂交瘤细胞株 M121ft l。
本发明中特异性结合 EGFR L858R突变蛋白的抗体可以通过多肽
KTPQHVKITDFGRAKLLG (SEQ ID NO: 5)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C2012125 , 名称为杂交瘤细胞株 M85_ 13。
本发明中特异性结合 EGFR L861Q突变蛋白的抗体可以通过多肽
ITDFGLAKQLGAEEKE (SEQ ID NO: 6)免疫小鼠来获得。 本发明中的通过该多 肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养物 保藏中心, 保藏号为 CCTCC C201315 , 名称为杂交瘤细胞株 M80_14。
本发明中特异性结合 EGFR A839T突变蛋白的抗体可以通过多肽
DRRLVHRDLTARNVLVKTP (SEQ ID NO: 7)免疫小鼠来获得。 本发明中的通过该 多肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养 物保藏中心, 保藏号为 CCTCC C201302 , 名称为杂交瘤细胞株 M1 18ft7。
本发明中特异性结合 EGFR N826S突变蛋白的抗体可以通过多肽
IAKGMSYLEDRRLVHR (SEQ ID NO: 8)免疫小鼠来获得。 本发明中的通过该多 肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养物 保藏中心, 保藏号为 CCTCC C201320 , 名称为杂交瘤细胞株 M1 17_ 10。
本发明中特异性结合 EGFR G863D突变蛋白的抗体可以通过多肽
ITDFGLAKLLDAEEKE (SEQ ID NO: 9)免疫小鼠来获得。 本发明中的通过该多 肽免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养物 保藏中心, 保藏号为 CCTCC C201304 , 名称为杂交瘤细胞株 M120。
本发明中特异性结合 EGFR V769L突变蛋白的抗体可以通过多肽
EAYVMASLDNPHV (SEQ ID NO: 10)免疫小鼠来获得。 本发明中的通过该多肽 免疫获得的杂交瘤细胞已经保藏在符合布达佩斯协议的中国典型培养物保 藏中心, 保藏号为 CCTCC C201316, 名称为杂交瘤细胞株 M122ftl。
本发明进一步包含一种单克隆抗体或者其抗原结合部位, 它们包括由 保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118、 CCTCC C201303、 CCTCC C2012125, CCTCC C201315, CCTCC C201302、 CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生的单克隆抗体的 重链氨基酸序列和轻链氨基酸序列。 在一些操作实例中, 本发明中的单克 隆抗体或许只包含由保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生 的单克隆抗体的重链氨基酸序列或者轻链氨基酸序列。
在某些操作实例中, 本发明的抗 EGFR抗体或者抗原结合部位包含一 条或者多条由保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118、 CCTCC C201303、 CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生的单克 隆抗体的重链或者轻链或者 CDR的氨基酸序列。 在某些操作实例中, 抗体 或者抗原结合部位包括由保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生 的单克隆抗体的重链和轻链的所有 CDR1、 CDR2以及 CDR3的氨基酸序列。
在某些操作实例中, 本发明的抗 EGFR抗体或者抗原结合部位包含由 保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118、 CCTCC C201303、 CCTCC C2012125, CCTCC C201315, CCTCC C201302、 CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生的单克隆抗体的 重链或者轻链可变区的氨基酸序列。 在特定的操作实例中, 抗体或者抗原 结合部位同时包含由保藏号为 C CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞所产生 的单克隆抗体的重链或者轻链可变区的氨基酸序列。
EGFR的结合特异性
本发明的抗体或者抗原结合部位能够分别特异性地结合突变型的 EGFR G719A, EGFR G719C, EGFR G719S , EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D以及 EGFR V769L蛋白, 但是不结 合野生型的 EGFR蛋白 (完全不结合或者在某种程度上不结合) 。 换言之, 该抗体或者抗原结合部位能够区分突变型和野生型的人类 EGFR蛋白。该结 合的特异性可以用已知的常用检测手段进行确认, 例如免疫印迹实验
(Western b lot ) , 酶联免疫吸附实验 (ELISA ) , 流式细胞分选, 免疫共 沉淀, 免疫荧光, 免疫组织化学染色, 表面离子共振 (例如 BIAC0RE™) 或 者放射免疫实验等方法。
在一些操作实例中, 该抗体能够特异性地优先结合突变型的 EGFR蛋 白, 对于突变型 EGFR蛋白的结合能力至少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍,或者至少 500倍强于其对野生型 EGFR蛋白的结 合能力。 在某些操作实例中, 本发明中的抗体或者抗原结合部位特异性结 合突变型 EGFR蛋白的解离平衡常数 KD至少 10倍,至少 20倍,至少 50倍, 至少 100倍, 至少 250倍, 至少 500倍, 或者至少 1000倍强于对野生型 EGFR蛋白的结合的解离平衡常数 (KD ) 。 解离平衡常数 (KD ) 可以通过表 面离子共振或者流式细胞计数测得。
本发明的抗体或者抗原结合部位或许只能结合一种 EGFR突变蛋白而 不能结合其他的 EGFR突变蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR 719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L的一种) 。 举例来说, 该抗体特异性地结合 EGFR G719A 蛋白的能力或许至少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍,或者至少 500倍强于其对其它任何一种突变 EGFR蛋白的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR G719A蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719C、 EGFR G719S、 EGFR D761Y、 EGFR L858R, EGFR L861Q , EGFR A839T, EGFR N826S , EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR G719A蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719C、 EGFR G719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR G719C蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719S、 EGFR D761Y、 EGFR L858R, EGFR L861Q , EGFR A839T, EGFR N826S , EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR G719C蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR G719S蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR D761Y、 EGFR L858R, EGFR L861Q , EGFR A839T, EGFR N826S , EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR G719S蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR D761Y蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR L858R, EGFR L861Q , EGFR A839T, EGFR N826S , EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR D761Y蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR G719S , EGFR L858R, EGFR L861Q, EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR L861Q蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y、 EGFR A839T、 EGFR N826S、 EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR L861Q蛋白的能力或许至少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于 其对其它任何一种突变 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y、 EGFR L858R、 EGFR A839T、 EGFR N826S、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR A839T蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y、 EGFR L858R、 EGFR L861Q, EGFR N826S , EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR A839T蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR G719S , EGFR D761Y, EGFR L858R, EGFR L861Q , EGFR N826S , EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR N826S蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T, EGFR G863D以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR N826S蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR G719S , EGFR D761Y, EGFR L858R, EGFR L861Q , EGFR A839T、 EGFR G863D 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR G863D蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T , EGFR N826S以及 EGFR V769L ) 。 举例来说, 该抗体特异性地结合 EGFR G863D蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR G719S , EGFR D761Y, EGFR L858R, EGFR L861Q , EGFR A839T、 EGFR N826S 以及 EGFR V769L ) 的结合能力。
在一些操作实例中, 该抗体或许只能结合 EGFR V769L蛋白而不结合 其他突变型的 EGFR蛋白 (例如 EGFR G719A、 EGFR G719C、 EGFR G719S、 EGFR D761Y, EGFR L858R, EGFR L861Q, EGFR A839T , EGFR N826S以及 EGFR G863D ) 。 举例来说, 该抗体特异性地结合 EGFR V769L蛋白的能力或许至 少 10倍, 至少 20倍, 至少 50倍, 至少 100倍, 至少 250倍, 或者至少 500倍强于其对其它任何一种突变 EGFR蛋白(例如 EGFR G719A、 EGFR G719C、 EGFR G719S , EGFR D761Y, EGFR L858R, EGFR L861Q , EGFR A839T、 EGFR N826S 以及 EGFR G863D ) 的结合能力。
在一些操作实例中, 本发明中的抗体或者抗原结合部位能够特异性结 合含有 SEQ ID N0 : 1, 2, 3, 4, 5, 6, 7, 8, 9或者 10的 EGFR多肽。 在 一些操作实例中, 本发明的抗体或者抗原结合部位特异性结合保藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302、 CCTCC C201320、 CCTCC C201304 或者 CCTCC C201316的杂交瘤细胞所产生的单克隆抗体的抗原表位或者与 其重合的抗原表位。
生产抗体的重组方法
本发明包括编码能够特异性结合人类突变型的 EGFR蛋白但是不能结 合野生型 EGFR蛋白的单克隆抗体及其抗原结合部位的核酸序列。人类突变 的 EGFR蛋白包括: G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D以及 V769L。 在一些操作实例当中, 该核酸分子只编码单克 隆抗体或者抗原结合部位的重链或者轻链。 在另外一些操作实例当中, 该 核酸分子同时编码单克隆抗体及其抗原结合部位的重链和轻链。 在一些操 作实例中, 该核酸分子编码保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303、 CCTCC C2012125, CCTCC C201315, CCTCC C201302、 CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤 细胞所产生的单克隆抗体的重链、 轻链、 重链可变区或者轻链可变区。 核 算可以是纯化的核酸分子。
编码本发明抗体的核酸分子可以从任何能够产生该抗体的来源中获 得。 例如, 核酸可以从保藏号为 CCTCC C201301、 CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞中获得。 分离纯化编码抗体的核酸的方法是一种已知的常见的技术。 具体方法可以 参见书籍: [美] J.莎姆布鲁克 D. W.拉塞尔著, 黄培堂等译, 《分子克隆实 验指南》 , 科学出版社, 第三版, 2002年。
在一些操作实例中, 编码本发明中的单克隆抗体的重链的核酸序列可 以是由编码本发明抗体的 VH结构域的核酸序列与一条编码任意其它来源抗 体的重链恒定区的组成的同框编码序列。 类似地, 一条编码本发明的抗 EGFR蛋白的轻链的核酸分子也可以是由编码本发明抗体的 V结构域的核 酸序列与一条编码任意其它来源的抗体的轻链恒定区的组成的同框编码序 列。
在进一步的操作实例中,编码重链可变区(VH)和 /或者轻链可变区(VL) 的核酸分子被转化为全长的抗体编码基因。 在一些操作实例中, 编码 VH或 者 VL结构域的核酸序列被分别通过***到已经含有重链恒定区 (CH) 或者 轻链恒定区 (CL) 的表达载体中去的方法构建为一个全长抗体基因。 这样 构建的全长抗体基因的 CH的片段与 CL的片段在载体内部相连接, 并且 /或 者编码 VH的片段与编码 VL的片段在载体内部相连接。在另外的操作实例中, 编码 vH以及 /或者 V结构域的核酸序列分别通过核酸重组技术被连接到一 个编码 cH的片段和 /或者编码 C 的片段上面。 编码人类免疫球蛋白重链和 轻链的恒定结构域的基因是已知的。 具体参见著作 Kabat et al . ,
Sequences of Prote i ns of Immunol ogi cal Interest, 5th ed., NIH Pub l . No. 91-3242, 1991。 编码全长重链和 /或者轻链的核酸分子可以在被引入 和纯化 EGFR抗体的细胞株中表达。
可以使用核酸分子实现重组表达大量的 EGFR抗体。 也可以用核酸分 子来生产嵌合抗体, 双特异性结合抗体, 单链抗体, 免疫粘附剂, 双头抗 体, 突变抗体以及抗体衍生物。 如果该核酸分子来自于非人类、 非转基因 动物, 该核酸分子也可能被用来实现抗体的人源化。
本发明还包括***有编码抗体重链、轻链或者同时编码本发明的 EGFR 抗体或者其抗原结合部位的核酸分子。该载体可能适合于在原核宿主细胞, 例如酵母细胞、 昆虫细胞或者哺乳动物细胞中表达本发明中的抗体或者其 抗原结合部位。
常见的哺乳动物细胞包括很多永生细胞系都可以用来作为表达宿主。 这些细胞系包括但不限于: 中国仓鼠卵巢细胞 (CH0 ) , NS0细胞, SP2细 胞, HEK293T细胞, 293 Free styl e ( Inv i trogen公司) , NIH3T3细胞, HeLa细胞, 幼仓鼠肾细胞 (BHK ) , 非洲绿猴肾细胞, 人类肝癌细胞 (如 HepG2 ), 以及 A549细胞。其它可以用于表达的细胞有昆虫细胞, 包括 sf9 和 sf2 1细胞。 植物宿主细胞包括: 烟草, 拟南芥, 浮萍, 玉米, 小麦, 番 茄, 水稻来源的细胞。 细菌宿主细胞包括大肠杆菌和放线菌。 酵母宿主包 括裂殖酵母, 酿酒酵母, 毕赤酵母。
利用不同的细胞系在不同的培养条件下, 或者利用转基因动物表达的 抗体能够有不同的糖基化模式。 但是不论其糖基化模式是怎样的, 所有由 所述的核酸或者含有所述核酸的序列编码的抗体都是本发明的内容。
嵌合与人源化抗体 这里所说的嵌合抗体, 其特征在于有来自于两种或者更多种不同的抗 体的结构域组成的抗体。 例如, 嵌合抗体的可变区结构域可能是来自于保 藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302 , CCTCC C201320 , CCTCC C201304以及 CCTCC C201316的杂交瘤细胞产生的单克隆抗体, 但是其恒 定区可能是来自于人类抗体。 这种嵌合抗体在作为人类的治疗药物时具有 较少的免疫原性。
在一些操作实例中, 本发明抗体的人源化抗体是一种将本发明中的来 源于老鼠的抗体的 CDR结构域***到人类受体抗体中去。 因此, 嵌合抗体 的 FR和恒定区域来自于人类。这种含有人类 FR区域的人源化 EGFR抗体在 人类身上比只是恒定区来自于人类的嵌合抗体具有更小的免疫原性。 在一 些操作实例中, 人源化抗体的 CDR序列可以是来自于保藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302、 CCTCC C201320、 CCTCC C201304 以及 CCTCC C201316的杂交瘤细胞产生的单克隆抗体。 抗体人源化的方法 是一种已知的成熟技术。
修饰与标签抗体
本发明还包括以上所描述的抗 EGFR单克隆抗体或其抗原结合部位被 至少一种额外分子或集团修饰而成的抗体。 该修饰可以是用于纯化或者检 测该抗体的, 以及 /或者增强其治疗效果。例如, 抗体或者抗原结合部位可 以连接到一种检测试剂、标签、 细胞毒性试剂、 药物分子以及 /或者蛋白或 多肽, 以便接到该抗体或者其抗原结合部位与其它一种分子 (例如亲和素 核心区域, 或者多聚组氨酸标签) 的结合。 常见的检测标签包括但不限于: 放射性同位素 (例如 125I, mI, 35S or ¾) , 荧光复合物 (例如荧光素, 二氯三嗪氨荧光素,异硫氰酸荧光素,罗丹明, 5-二甲氨基 -1-萘磺酰氯苯, 荧光素 PE , 稀土发光物, 伞形酮, 丹磺酰氯) , 以及酶 (例如辣根过氧化 物酶, 0-半乳糖苷酶, β_半乳糖苷酶, 荧光素酶, 碱性磷酸酶, 葡萄糖氧 化酶, 乙酰胆碱酯酶) 。 在进一步的操作实例中, 本发明所述抗体或者其 部分可以被标记生物素, 或者已经证明可以被另一个报告分子 (例如亮氨 酸拉链配对区域, 二抗结合位点, 金属集合结构域, 表位标签) 识别的多 肽表位。 在更进一步的操作实例中, 任意一种抗体或者其部分可以利用聚 乙烯醇 (PEG) , 甲基或乙基或者糖基经行修饰。
抗 EGFR抗体或者其抗原结合部位的诊断用途
本发明的一个方面是使用所述的抗 EGFR抗体或者其抗原结合部位作 为一种癌症诊断试剂。 癌症指的是任意一种恶性肿瘤, 包括任何阶段和级 别的癌症。 可能用本发明的单克隆抗体诊断的癌症具体例子包括但是不限 于: 肺癌, 非小细胞肺癌, 直肠癌, 结肠癌, ***状甲状腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 胶质瘤, 脑癌。
诊断包括检测癌症的发展程度, 确认癌症的存在, 或者癌症的分型或 分类。 在一些操作实例中, 本发明可以提供一种诊断目标中癌症的方法, 其步骤包括:用本发明所述的抗 EGFR单克隆抗体接触来自于检测目标的生 物学样本; 检测抗体或者其部分与样本是否结合; 如果抗体与样本存在结 合则表明被检测主体是癌症, 或者存在发展成癌症的风险。 检测的样本可 以是血液,血清,淋巴,组织(例如穿刺或者甲醛和石蜡固定的包被切片)。
抗体结合到样本上与否可以用常见的的已知技术检测, 包括但是不限 于: ELISA, RIA, 流式细胞, 免疫细胞化学, 免疫组织化学, 免疫荧光, 免疫印迹,或者免疫共沉淀。抗 EGFR抗体或者其部分也可以用一种可以检 测的标记物直接标记。 如果抗体没有被标记, 则可以使用一种能够结合 EGFR抗体并能够被检测到的二抗或者其它分子。 根据已有的常识, 特定的 二抗能够特异性地结合特定的种类和亚型的一抗。例如,如果抗 EGFR抗体 是一种小鼠 IgG, 则二抗必须是一种标记的抗小鼠 IgG的抗体。 其它能够 结合抗体的分子包括但是不限于 Protein A和 Protein G。 他们都有多种 商业化的形式。 例如来自 Pierce公司的 Protein A和 Protein G。 适合用 来标记抗体或者二抗的分子包括但是不限于: 酶, 辅基, 荧光材料, 发光 材料, 磁性材料以及放射性材料 (见上文描述) 。 在一些操作实例中, 本 发明的抗体或者其部分可以提供在一种包含检测抗体结合试剂的试剂盒 中。
抗 EGFR抗体或者其部分还可以用来检查癌症病人的发展进程, 然后 决定采取哪一种治疗治疗方案。 例如在治疗方案的伴随检测中。 医务人员 可能根据 EGFR突变的检测结果来决定对特定病人最优的治疗方案。治疗方 案可以是手术, 放射性治疗, 药物治疗 (包括化学治疗与靶向治疗) , 或 者以上多种治疗方式的结合。 举例来说, 本发明包括一种治疗癌症病人的 方法, 其特征在于包括: 检查来自病人的生物样本是否带有 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L 突变; 如果存在某种突变则对病人给予 EGFR抑制剂治疗。 EGFR抑制剂可 能是一种反义 RNA( anti sense RNA),小干涉 RNA( s iRNA),微小 RNA( miRNA ) 药物, 抗 EGFR单克隆抗体药物。 在给予病人抗 EGFR物的靶向治疗之前检 测是否存在 EGFR突变对于治疗十分有意义。
抗 EGFR抗体及其抗原结合部位的治疗应用
本发明同样提供一种抗体及其抗原结合部位作为治疗性药物的应用 包括用本发明的抗体或者其部分作为治疗人类的应用, 以及使用抗体或者 其部分作为制造用于治疗人类癌症药物的应用。这些人类癌症包括直肠癌, ***状甲状腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 肺癌。 详细的癌 症种类亦可参阅上文的描述。
在一些操作实例中, 医务人员给予能够对特定疾病达到有效剂量的本 发明的抗体或者部分, 一般是一种嵌合的或者人源化的抗体或者部分, 从 而实现减缓或者治疗该疾病, 防止癌症转移或者进一步发展。 抗体的给药 方式可以是例如: 注射或者浸注。 抗体或者部分的剂量可以由医务人员决 定, 大致范围为 0. 1到 100毫克 /公斤体重, 更优地为 0. 5到 50毫克 /公斤 体重, 更优地为 1到 20毫克 /公斤体重, 更优地为 1到 10毫克 /公斤体重。 治疗的效果可以通过监测例如肿瘤体积缩小的程度来说明。 本发明的治疗性药物的成分除了所述的单克隆抗体或者其部分以外, 可能包括一种可接受的药剂载体。 可接受的药剂载体其特征在于, 可以是 一种溶剂, 分散剂, 包被剂, 抗菌剂和抗真菌剂, 渗透平衡剂和吸附延缓 剂, 其特征是具有生理兼容性。 在很多情况下, 优先的载体包括渗透平衡 剂, 例如糖类, 多聚醇如甘露醇, 山梨醇, 氯化钠组分。 其它可以接受的 药剂材料包括湿润剂或者少量的辅剂, 例如湿润剂, 乳化剂, 保护剂或缓 冲液, 它们能够增加抗体的保质期或者效果。
在一些操作实例中, 本发明的抗 EGFR抗体或者其部分被与其它一种 和 /或者多种治疗药物, 诊断药物, 或者预防剂混合在一起。 治疗药物包括 但不限于具有不同细微特异性差异的结合不同靶标的抗 EGFR抗体, 以及 EGFR抑制剂, 例如抑制剂可以是西妥昔单抗 (cetuxmab ) , 帕尼单抗
(panitumumab ) , Necitumumab, Nimotuzumab , 吉非替尼 ( gef itinib ) , 厄洛替尼 (erlotinib) ,拉帕替尼 ( lapatinib ),凡德他尼 (Vandetanib ), PF299804, R05083945, ABT-806 , AP-26113 , Afatinib (BIBW2992) , Canertinib (CI-1033), Neratinib (HKI- 272), CP-724714, TAK- 285, AST-1306 , ARRY334543 , Lapatinib, Arry-380, Dacomitinib (PF - 299804), WHI-P154, Desmethyl Erlotinib (CP-473420) , Desmethyl Erlotinib
( OSI-420 ) , AZD8931 , AEE788 (NVP- AEE788), Pel itinib (EKB- 569), CUDC-101 , WZ804, WZ4002 , WZ3146 , XL647, PD-153035 , PD-174265, PD 158780, BMS-599626 (AC480), Lavendustin A, Lavendustin C, BIBU-1361 , Hypericin, BIBX-1382 , DAPH, Erbstatin Analog, JNJ 28871063 , R0 106-9920, GW2974, GW 583340, PD-153035, PD-158780 , PD-168393 , Tyrphostin AG - 183, Tyrphostin AG - 99, Tyrphostin AG-825 , Tyrphostin B42 (AG - 490 ) , Tyrphostin AG_494, Tyrphostin AG-555, Tyrphostin AG - 527, Tyrphostin AG - 528, Tyrphostin AG - 835, Tyrphostin AG - 1478, Tyrphostin RG- 14620, Daphnetin, BPIQ , BPIQ- I, BPIQ- II, CL- 387, 785, EGFR Inhibitor (K00598a) , LFM-A12 , Pel itinib, PKC-412 , PP3 ( 5334-30-5 ) , SU 5402 , HDS 029, WHI-P 154 , TAK 165 , Vatalanib o 本发明的药剂组成可能含有一种 "治疗有效剂量"或者 "预防有效量" 的本发明的抗体或者抗原结合部位。 "治疗有效剂量" 是指在一定的疗程 和剂量下, 要达到有治疗效果的有效药物量。 抗体及其抗原结合部分的治 疗有效剂量可能根据多种因素, 例如疾病进程, 年龄, 性别, 体重, 以及 抗体或者抗体部分能够在个体内所引起的反应能力而有所不同。 治疗有效 剂量也包含了该抗体或者抗原结合部位的有利作用强于任何毒性或者不利 作用的意思。 "预防有效量" 是指在一定的疗程和剂量下, 要达到有预防 效果的有效药物量。 通常由于预防药物都是在疾病发生之前或者疾病早期 使用, 因此预防有效量可能会小于治疗有效量。
除非特别声明, 这里所用的所有的技术或者科学属于都与一般熟知本 发明领域的人员的常识相一致。 可效仿的方法和材料在下面将进行详细描 述,尽管与这里描述的相似或者同样的方法和材料也可以用来检验本发明。 所有的参考文献都详细列出。 尽管引用了大量的文献, 但是这些引用并不 表明承认任何文献是该领域的常识。本专利描述过程中使用的"包含" "包 括" 应当被理解为表明包含所述的完整对象或者群体对象, 而不是排除任 何其他的对象或者群体对象。 材料、 方法和实例仅是为了说明本发明的技 术方案, 并非限制。
以下实例是为了描述本发明的方法与材料。 对描述的条件或参数适当 的修改或者同等替换通常符合本领域技术人员的明显常识, 因此依然属于 本发明的精神和范围。 附图说明
图 1显示保藏号为 CCTCC C201301的细胞株产生的抗体特异性结合 EGFR G719A蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 图 2显示保藏号为 CCTCC C2012127的细胞株产生的抗体特异性结合 EGFR G719C蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR G719C蛋白;
图 3显示保藏号为 CCTCC C20121 18的细胞株产生的抗体特异性结合 EGFR G719S蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR G719S蛋白;
图 4显示保藏号为 CCTCC C201303的细胞株产生的抗体特异性结合 EGFR D761Y蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR D761Y蛋白;
图 5显示保藏号为 CCTCC C2012125的细胞株产生的抗体特异性结合 EGFR L858R蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR L858R蛋白;
图 6显示保藏号为 CCTCC C201315的细胞株产生的抗体特异性结合 EGFR L861Q蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR L861Q蛋白;
图 7显示保藏号为 CCTCC C201302的细胞株产生的抗体特异性结合 EGFR A839T蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR A839T蛋白;
图 8显示保藏号为 CCTCC C201320的细胞株产生的抗体特异性结合 EGFR N826S蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR N826S蛋白;
图 9显示保藏号为 CCTCC C201304的细胞株产生的抗体特异性结合 EGFR G863D蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR G863D蛋白;
图 10显示保藏号为 CCTCC C201316的细胞株产生的抗体特异性结合 EGFR V769L蛋白, 却不能结合野生型的 EGFR蛋白的免疫印染实验图谱。 泳道 1含有大肠杆菌表达的野生型 EGFR蛋白。泳道 2含有大肠杆菌表达的 突变型 EGFR V769L蛋白;
图 1 1显示保藏号为 CCTCC C201301的细胞株产生的抗体特异性结合 EGFR G719A蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR G719A 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR G719A蛋白的细胞 (下面) 中出现;
图 12显示保藏号为 CCTCC C2012127的细胞株产生的抗体特异性结合 EGFR G719C蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR G719C 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR G719C蛋白的细胞 (下面) 中出现;
图 13显示保藏号为 CCTCC C20121 18的细胞株产生的抗体特异性结合 EGFR G719S蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR G719S 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR G719S蛋白的细胞 (下面) 中出现;
图 14显示保藏号为 CCTCC C201303的细胞株产生的抗体特异性结合 EGFR D761Y蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR D761Y 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR D761Y蛋白的细胞 (下面) 中出现;
图 15显示保藏号为 CCTCC C2012125的细胞株产生的抗体特异性结合 EGFR L858R蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR L858R 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR L858R蛋白的细胞 (下面) 中出现;
图 16显示保藏号为 CCTCC C201315的细胞株产生的抗体特异性结合 EGFR L861Q蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR L861Q 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR L861Q蛋白的细胞 (下面) 中出现;
图 17显示保藏号为 CCTCC C201302的细胞株产生的抗体特异性结合 EGFR A839T蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR A839T 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR A839T蛋白的细胞 (下面) 中出现;
图 18显示保藏号为 CCTCC C201320的细胞株产生的抗体特异性结合 EGFR N826S蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR N826S 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR N826S蛋白的细胞 (下面) 中出现;
图 19显示保藏号为 CCTCC C201304的细胞株产生的抗体特异性结合 EGFR G863D蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR G863D 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR G863D蛋白的细胞 (下面) 中出现; 图 20显示保藏号为 CCTCC C201316的细胞株产生的抗体特异性结合 EGFR V769L蛋白, 却不能结合野生型的 EGFR蛋白的免疫荧光实验图谱。 绿色荧光蛋白(GFP )信号分别指示野生型 EGFR (上面)和突变型 EGFR V769L 蛋白 (下面) 的表达。 红色荧光信号能够指示该抗体与 EGFR蛋白的结合, 并且只在表达 EGFR V769L蛋白的细胞 (下面) 中出现。 具体实施方式
实施例 1
特异性结合 EGFR突变蛋白的单克隆抗体的生产
含有 EGFR突变蛋白氨基酸序列的多肽通过合成获得。详细的多肽序列 在下表中列出, 相对野生型蛋白的突变氨基酸加下划线标示:
表 1 突变的 EGFR多肽
Figure imgf000025_0001
每条合成的多肽都被偶联到琥珀酰化钥孔慽血兰蛋白 (keyhole limpet hemocyanin, KLH ) 上, 用来免疫小鼠, 并利用弗氏佐剂混合增强免疫效 果。 将用以上多肽免疫的抗 EGFR G719A、 G719C、 G719S、 D761Y、 L858R 和 L861Q小鼠的脾脏细胞分别与小鼠骨髓瘤 SP2/0细胞通过聚乙烯醇(PEG ) 介导融合。 用 ELISA实验筛选阳性克隆。 阳性克隆细胞注射到相同品系的 小鼠腹腔, 产生腹水。 从腹水中纯化抗体。
通过用含有突变的 EGFR蛋白的多肽免疫小鼠产生的杂交瘤细胞保藏 在中国典型培养物保藏中心 (CCTCC, 湖北省武汉市武汉大学, 430072 ) . 杂交瘤细胞的名称和保藏编号在下表中列出。
表 2 抗 EGFR杂交瘤细胞株以及保藏编号
Figure imgf000026_0001
实施例 2
免疫印迹实验分析单克隆抗体特异性结合大肠杆菌和动物细胞表达的 突变蛋白
在大肠杆菌中中表达 EGFR蛋白时, 将编码 EGFR野生型以及 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或 者 V769L突变型蛋白的 cDNA序列克隆到带有 6个组氨酸标签的细菌表达载 体 pET28a上。 构建好的质粒转化到大肠杆菌 BL21 (DE3)菌株中, 并将转化 的细菌涂布到含有卡那霉素的 LB培养基平板上, 在 37 °C培养。 从平板上 挑选单克隆菌落,放入含有 500毫升含有卡那霉素的 LB培养基的锥形瓶中。 将锥形瓶放在 37 °C的摇床中培养到 0D600接近 1. 0。 然后往锥形瓶中加入 0. 2 mM的 IPTG在 37 °C诱导培养 3个小时。 离心收集培养的细菌, 然后加 入裂解液 (20 mM Tris, lOO mM NaCl , 1 % Triton™ X- 100, 以及蛋白酶抑 制剂) 。 裂解的细菌液在 12000g的速度下离心 30分钟, 收集上清。 将上 清加入到一个镍柱上, 按照镍柱生产商的说明纯化得到纯的 EGFR蛋白。然 后将 0. 1 μ§每种纯化的 EGFR蛋白分别与等体积的 2 X SDS上样缓冲液混 合, 并在 95 °C加热 10分钟。
在用哺乳动物细胞表达时,将编码 EGR野生型以及 EGFR G719A、G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L突变型 蛋白的 cDNA序列克隆到哺乳动物表达载体 pCNDA3. 0中, 并且与一个编码 绿色荧光蛋白 (GFP ) 的序列融合形成一个开放阅读框。构建好的质粒转化 到 DH5a大肠杆菌中, 以扩增并抽提质粒。 在转染前一天, 将 HEK293T细胞 以 30%的密度铺到 24孔细胞培养板中, 放在 37 °C的 5% ( 02培养箱中培养。 然后将含有 0. 5 μ§表达每种 EGFR蛋白的质粒用标准的磷酸钙转染的方法 转染到 HEK293T细胞中。转染的细胞继续培养 24小时。然后将转染的细胞 收集, 每孔细胞加入 20 μΐ的细胞裂解液, 在冰上放置 10分钟。 然后将 细胞在 12000转的速度下离心 10分钟, 收集上清。 分别取 10 μΐ每种细 胞裂解液的上清, 与等体积的 2 X SDS上样缓冲液混合, 并在 95 °C加热 10 分钟。
将 10 μΐ每种准备好的 EGFR蛋白样品加入到 10% 的 SDS-PAGE蛋白胶 上。在 90伏电压下电泳 90分钟。然后将胶上分离的蛋白转移到 PVDF膜上。 用 5%的脱脂牛奶封闭 PVDF膜。 然后将转印有 EGFR蛋白的 PVDF膜放到含 有实施例 1中纯化的抗体的 TBS缓冲液中在 4 °C孵育 16小时。然后去掉抗 体, 用含有 0. 1%吐温 ®-20的 TBS缓冲液漂洗三次 PVDF膜, 每次漂洗 5分 钟。 然后将膜放入含有 HRP-标记的抗小鼠的二抗中孵育 30分钟。 去掉二 抗, 再次用含有 0. 1%吐温 ®-20的 TBS缓冲液漂洗三次 PVDF膜, 每次漂洗 5分钟。 然后将膜放入到含有 ECL底物的溶液中浸润, 并在暗室中用胶片 感光。 洗片, 显影, 定影。
图 1, 图 2, 图 3, 图 4, 图 5, 图 6, 图 7, 图 8, 图 9和图 10显示, 在免疫印迹实验中,实施例 1 中生产的抗 EGFR G719A、G719C、G719S、D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L单克隆抗体能够分别特 异性地结合 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L突变蛋白, 但是并不结合野生型的 EGFR蛋白, 并且不论该蛋白是在大肠杆菌中表达的, 还是在哺乳动物细胞中表达的。 实施例 3
免疫荧光实验分析这些单克隆抗体特异性结合哺乳动物细胞内表达的 EGFR蛋白
能够表达带有 GFP标签的野生型以及 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L突变型 EGFR蛋 白的 pCDNA3. 0质粒按照实施例 2的方法构建。在转染前,将无菌处理的载 玻片放到 24孔细胞培养板中, 并将 HEK293T细胞以 30%的密度铺到这些孔 内, 放在 37 °C的 5% C02培养箱中培养。 然后将含有 0. 5 μβ表达每种 EGFR 蛋白的质粒用标准的磷酸钙转染的方法转染到 HEK293T细胞中。 转染的细 胞继续培养 36小时。 然后将细胞用 3. 7%的多聚甲醛固定 10分钟。 以及含 有 1% Triton™ X-100的 PBS缓冲液处理细胞 10分钟, 以增加其通透性。 然后用含有 5%谈牛血清的的 PBS封闭处理 10分钟。然后将这些处理的细 胞分别放在含有实施例 1生产的抗 EGFR单克隆抗体的缓冲液中在 4 °C孵 育 16小时。 然后去掉抗体, 将细胞用 PBS缓冲液漂洗三次, 每次漂洗 5 分钟。然后加入标记有荧光发光物的抗小鼠的二抗中孵育 30分钟。同时在 二抗溶液中加入 DAPI染料以染色细胞核。去掉二抗, 再次用 PBS缓冲液漂 洗三次, 每次漂洗 5分钟。 然后将附着有细胞的载玻片取出来, 固定到载 玻片上并且用指甲油封闭。 在荧光显微镜下观察细胞并拍照。
图 1 1, 图 12, 图 13, 图 14, 图 15, 图 16, 图 17, 图 18, 图 19和 图 20显示,在免疫荧光实验中, 实施例 1 中生产的抗 EGFR G719A、 G719C、
G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L单克隆 抗体能够分别特异性地结合在哺乳动物细胞中表达的抗 EGFR G719A、
G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L 突变蛋白, 但是并不结合野生型的 EGFR蛋白。
以上实施例仅用以说明本发明的技术方案而非限制, 尽管参照较佳实 施例对本发明进行了详细说明, 本领域的普通技术人员应当理解, 可以对 本发明的技术方案进行修改或者等同替换, 而不脱离本发明技术方案的精 神和范围, 其均应涵盖在本发明的权利要求范围当中。

Claims

权 利 要 求 书
1.特异性识别 EGFR突变蛋白的单克隆抗体,其特征在于, 不能识别 EGFR野生型蛋白的单克隆抗体, 或者抗原结合蛋白, 该单克隆抗体特异性 识别的 EGFR突变蛋白包括: 第 719位的甘氨酸(Glycine, G)突变为丙氨 酸 (Alanine, A) 的突变蛋白 (EGFR G719A) ; 第 719位的甘氨酸 (G) 突变为半胱氨酸(C)的突变蛋白(EGFR G719C);第 719位的甘氨酸(Glycine, G) 突变为丝氨酸 (Serine, S) 的突变蛋白 (EGFR G719S) ; 第 761位的 天冬氨酸 (Asparatic Acid, D) 突变为酪氨酸 (Tyrosine, Y) 的突变蛋 白(EGFRD761Y);第 858位的亮氨酸(Leucine, L)突变为精氨酸(Arginine, R) 的突变蛋白 (EGFRL858R) ; 第 861位的亮氨酸 (Leucine, L) 突变为 谷氨酰胺 (Glutamine, Q) 的突变蛋白 (EGFRL861Q) ; 第 839位的丙氨 酸(Alanine, A)突变为苏氨酸(Threonine, T)的突变蛋白(EGFR A839T); 第 826位的天冬酰胺 (Asparagine, N) 突变为丝氨酸 (Serine, S) 的突 变蛋白 (EGFR N826S) ; 第 863位的甘氨酸 (Glycine, G) 突变为天冬氨 酸 (Asparatic Acid, D) 的突变蛋白 (EGFRG863D) ; 第 769位的缬氨酸 (Valine, V) 突变为谷亮氨酸 (Leucine, L) 的突变蛋白 (EGFR V769L) 。
2.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID NO: 1的 EGFR 蛋白。
3.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:2的 EGFR 蛋白。
4.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:3的 EGFR 蛋白。
5.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:4的 EGFR 蛋白。
6.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:5的 EGFR 蛋白。
7.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:6的 EGFR 蛋白。
8.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:7的 EGFR 蛋白。
9.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的制 备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:8的 EGFR 蛋白。
10.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的 制备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID N0:9的 EGFR 蛋白。
11.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的 制备方法, 其特征在于, 特异性结合于含有多肽序列 SEQ ID NO: 10的 EGFR 蛋白。
12.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体的 制备方法, 其特征在于, 包括抗原结合部位, 由一条重链和一条轻链组成; 重链和轻链的 CDR1、 CDR2以及 CDR3的氨基酸序列分别是由中国典型培养 物保藏中心 (CCTCC) 保藏号为 CCTCC C20130K CCTCC C2012127, CCTCC C2012118, CCTCC C201303, CCTCC C2012125, CCTCC C201315, CCTCC C201302, CCTCC C201320、 CCTCC C201304以及 CCTCC C201316的杂交瘤细胞产生的 单克隆抗体的 CDR1、 CDR2以及 CDR3的氨基酸序列决定。
13.根据权利要求 12所述的特异性识别 EGFR突变蛋白的单克隆抗体的 制备方法, 其特征在于, 包括抗原结合部位, 所述杂交瘤细胞所产生的单 克隆抗体重链和轻链的组成分别包含重链和轻链的可变区域。
14.根据权利要求 12所述的特异性识别 EGFR突变蛋白的单克隆抗体的 制备方法, 其特征在于, 包括抗原结合部位, 包含有所述的杂交瘤细胞所 产生的单克隆抗体的重链和轻链氨基酸序列。
15.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体, 其特征在于, 包括抗原结合部位, 是一种人源化或者嵌合型抗体。
16.根据权利要求 2至 13及 15任一项所述的特异性识别 EGFR突变蛋 白的单克隆抗体的制备方法, 其特征在于, 所述单克隆抗体是一种 IgG。
17.根据权利要求 1所述的特异性识别 EGFR突变蛋白的单克隆抗体, 其特征在于, 保存在中国典型培养物保藏中心 (CCTCC ) 的保藏号为 CCTCC C20130 K CCTCC C2012127 , CCTCC C20121 18、 CCTCC C201303、 CCTCC C2012125 , CCTCC C201315 , CCTCC C201302、 CCTCC C201320、 CCTCC C201304 以及 CCTCC C201316的十株杂交瘤细胞。
18.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 该 单克隆抗体或者抗原结合部位的药物, 以及可以药用的载体。
19.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 一 种诊断 EGFR突变的诊断试剂盒, 其组成含有权利要求 1至 14所述的任意 一种单克隆抗体或者抗原结合部位。
20.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 一 种诊断肿瘤的方法, 其特征在于, 包括以下步骤:
( 1 ) 用权利要求 1至 14所述的任意一种单克隆抗体或者抗原结合部 位接触需要检测的生物样本;
( 2 )检测单克隆抗体或者抗原结合部位是否与样本发生结合, 而结合 指示样本存在癌症或者发展成癌症的风险。
21.根据权利要求 20所述的特异性识别 EGFR突变蛋白的单克隆抗体的 应用, 其特征在于, 所述诊断方法中, 常见的癌症类型包括: 肺癌, 非小 细胞肺癌, 直肠癌, 结肠癌, ***状甲状腺癌, 胰腺癌, 食道癌, *** 癌, 卵巢癌, 胶质瘤, 脑癌。
22.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 一 种治疗癌症病人的方法, 其特征在于:
(1) 检测来自于病人的生物学样品中是否含有 EGFR G719A、 G719C、 G719S、 D761Y、 L858R、 L861Q、 A839T、 N826S、 G863D或者 V769L突变;
(2) 如果存在上述突变, 对该病人给予 EGFR蛋白抑制剂的治疗。
23.根据权利要求 22所述的特异性识别 EGFR突变蛋白的单克隆抗体的 应用, 其特征在于, 所述治疗方法中, EGFR蛋白抑制剂包括: 反义 RNA
(antisense RNA) , 小干涉 RNA (siRNA) , 微小 RNA (mi RNA) 药物, 抗 EGFR单克隆抗体药物。 EGFR抑制剂可以是西妥昔单抗(cetuxmab) , 帕尼 单抗 (panitumumab), Necitumumab, Nimotuzumab,吉非替尼 (gef itinib), 厄洛替尼 (erlotinib) ,拉帕替尼 (lapatinib),凡德他尼 (Vandetanib), PF299804, R05083945, ABT-806, AP-26113, Afatinib (BIBW2992) , Canertinib (CI— 1033), Neratinib (HKI— 272), CP— 724714, TAK— 285, AST-1306, ARRY334543, Lapatinib, Arry-380, Dacomitinib (PF - 299804), WHI-P154, Desmethyl Erlotinib (CP-473420) , Desmethyl Erlotinib (OSI-420) , AZD8931, AEE788 (NVP- AEE788), Pelitinib (EKB- 569), CUDC-101, WZ804, WZ4002, WZ3146, XL647, PD-153035, PD-174265, PD 158780, BMS-599626 (AC480), Lavendustin A, Lavendustin C, BIBU- 1361, Hypericin, BIBX-1382, DAPH, Erbstatin Analog, JNJ 28871063, R0 106-9920, GW2974, GW 583340, PD-153035, PD-158780, PD-168393, Tyrphostin AG - 183, Tyrphostin AG - 99, Tyrphostin AG-825, Tyrphostin B42 (AG - 490) , Tyrphostin AG - 494, Tyrphostin AG - 555, Tyrphostin AG - 527, Tyrphostin AG - 528, Tyrphostin AG - 835, Tyrphostin AG - 1478, Tyrphostin RG— 14620, Daphnetin, BPIQ , BPIQ- I, BPIQ- II, CL- 387, 785, EGFR Inhibitor (K00598a) , LFM-A12 , Pel itinib, PKC-412 , PP3 ( 5334-30-5 ) , SU 5402 , HDS 029, WHI-P 154, TAK 165, Vatalanibo
24.根据权利要求 22所述的特异性识别 EGFR突变蛋白的单克隆抗体的 应用, 其特征在于, 所述治疗癌症病人的方法, 给予病人含有权利要求 11 的组成成分的药物。
25.根据权利要求 22或 24所述的特异性识别 EGFR突变蛋白的单克隆 抗体的应用, 其特征在于, 所述治疗癌症病人的方法中, 常见的癌症类型 包括: 直肠癌, ***状甲状腺癌, 胰腺癌, 食道癌, ***癌, 卵巢癌, 肺癌。
26.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 将 权利要求 1至 15的单克隆抗体或者抗原结合部位用于癌症治疗药物的生产 过程, 常见的癌症种类包括: 黑色素癌, 直肠癌, 甲状腺癌, 胰腺癌, 食 道癌, ***癌, 卵巢癌, 乳腺癌, 肺癌, 或者造血组织癌。
27.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 一 种纯化的核酸分子,包含能够编码权利要求 1至 15所述单克隆抗体的重链 或者其一个抗原结合部位, 或者能够编码轻链或者其一个抗原结合部位, 或者能够同时编码二者的核酸序列。
28.根据权利要求 27所述的特异性识别 EGFR突变蛋白的单克隆抗体的 应用, 其特征在于, 一种载体分子, 含有可以联系到该核酸分子的表达调 控序列。
29.根据权利要求 27的特异性识别 EGFR突变蛋白的单克隆抗体的应 用, 其特征在于, 一种宿主细胞, 含有该核酸分子。
30.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 包 含权利要求 1至 14的一种细胞株,其含有所述的单克隆抗体或者其抗原结 合部位。
31.特异性识别 EGFR突变蛋白的单克隆抗体的应用, 其特征在于, 一 种生产单克隆抗体或者其抗原结合部位的方法, 所生产的抗体或者抗原结 合部位特异性结合人类突变的 EGFR蛋白, 而不结合人类野生型的 EGFR蛋 白, 其步骤包括:
(1) 根据权利要求 29, 在适当的条件下培养该宿主细胞, 或者根据 权利要求 30, 在释放的条件下培养该细胞株;
(2) 提纯所述的抗体部分。
PCT/CN2013/074626 2013-04-19 2013-04-24 特异性识别egfr突变蛋白的单克隆抗体、制备方法及其应用 WO2014169494A1 (zh)

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