WO2022237666A1 - 一种抗Claudin18.2抗体及其抗体药物偶联物 - Google Patents

一种抗Claudin18.2抗体及其抗体药物偶联物 Download PDF

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WO2022237666A1
WO2022237666A1 PCT/CN2022/091353 CN2022091353W WO2022237666A1 WO 2022237666 A1 WO2022237666 A1 WO 2022237666A1 CN 2022091353 W CN2022091353 W CN 2022091353W WO 2022237666 A1 WO2022237666 A1 WO 2022237666A1
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amino acid
antibody
seq
acid sequence
variable region
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French (fr)
Inventor
房健民
李元浩
朱梅英
姜静
沈月雷
李慎军
罗文婷
张晓萍
王丽丽
王凌
张钦斌
杨放
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Remegen Co Ltd
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Remegen Co Ltd
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Priority to JP2023532228A priority Critical patent/JP7675818B2/ja
Priority to EP22806632.0A priority patent/EP4335873A4/en
Priority to KR1020237029053A priority patent/KR20230135653A/ko
Priority to BR112023009912A priority patent/BR112023009912A2/pt
Priority to AU2022275043A priority patent/AU2022275043B2/en
Priority to CN202280007271.2A priority patent/CN117157105A/zh
Priority to CA3184403A priority patent/CA3184403A1/en
Priority to US18/016,352 priority patent/US12577320B2/en
Publication of WO2022237666A1 publication Critical patent/WO2022237666A1/zh
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    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
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    • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
    • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
    • A61K47/68031—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being an auristatin
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    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6849—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a receptor, a cell surface antigen or a cell surface determinant
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    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6889—Conjugates wherein the antibody being the modifying agent and wherein the linker, binder or spacer confers particular properties to the conjugates, e.g. peptidic enzyme-labile linkers or acid-labile linkers, providing for an acid-labile immuno conjugate wherein the drug may be released from its antibody conjugated part in an acidic, e.g. tumoural or environment
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    • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value

Definitions

  • the present invention relates to the field of biomedicine, in particular to an anti-Claudin18.2 antibody and its antibody-drug conjugate, and the present invention also relates to the use of the above-mentioned antibody and its antibody-drug conjugate.
  • ADC Antibody-drug conjugate
  • Drug biologically active drug
  • Antibody antibody
  • Linker chemical linker
  • CLDNs have been confirmed to have changes in expression patterns during the occurrence and development of many tumors, and the research on targeted therapy using CLDNs lineage as a specific marker protein has attracted extensive attention.
  • individual members such as CLDN 18 protein are often highly selectively expressed in specific tissues such as the gastrointestinal tract.
  • the CLDN 18 gene is located at 3q22.3 of human chromosome 3, and the first exon of the gene has two options, thus forming two different splicing mutants, which can express 69 different amino acid sequences at the N-terminal Two protein subtypes, namely Claudin 18.1 protein and CLDN 18.2 protein (Document 3: Hayashi D, Tamura A, Tanaka H, et al.
  • Claudin 18.1 protein is a specific antigen selectively expressed by alveolar epithelial cells, which is only highly expressed in normal alveolar tissue, while It was not found in other normal tissues including pancreatic duct (Literature 4: Li G, Flodby P, Luo J, et al.
  • Claudin 18.2 protein is also a highly selective marker protein, but its distribution organization is completely different from Claudin 18.1 protein.
  • the expression of Claudin 18.2 protein is highly restricted in normal healthy tissues, but it is abnormally activated and overexpressed in various primary malignant tumors such as gastric cancer, breast cancer, colon cancer, liver cancer, head and neck cancer, bronchial cancer and non-small cell lung cancer, especially Occurs more frequently in malignant tumors of the digestive system, including gastric cancer (70%), pancreatic cancer (50%), esophageal cancer (30%), etc.
  • Claudin 18.2 is an ideal tumor patient marker and target for anti-tumor drug development, especially gastric cancer, pancreatic cancer, esophageal cancer, lung cancer, ovarian cancer, etc., but due to the specificity of its target (structure and Claudin 18.1 are highly similar, and the first domain of the extracellular region of the two is identical), the development of Claudin 18.2 therapeutic antibody is very difficult, which is also the main reason for limiting the development of Claudin 18.2 targeted drugs.
  • the invention provides an antibody targeting Claudin 18.2, an antibody-drug conjugate and their use in treating cancer.
  • the present invention also provides nucleotides encoding the above-mentioned Claudin 18.2 antibody, polynucleotide combinations, expression vectors and expression vector combinations, pharmaceutical compositions comprising the above-mentioned Claudin 18.2 antibody, antibody-drug conjugates, and their preparation for treatment or Use in preventive cancer drugs.
  • the present invention provides an anti-Claudin18.2 antibody or an antigen-binding fragment thereof, the antibody or an antigen-binding fragment thereof comprising a heavy chain variable region and a light chain variable region, and the CDR of the heavy chain variable region And/or the CDR of the light chain variable region has the same CDR sequence or 1-2 amino acid substitutions on the CDR of the antibody defined by the following sequence, and the antibody defined by the sequence is:
  • the present invention also provides an anti-Claudin18.2 antibody or antigen-binding fragment, in some specific embodiments, it comprises heavy chain and light chain variable region sequences, wherein
  • the heavy chain variable region CDR1 amino acid sequence is as shown in SEQ ID NO: 3, 4, 5, 6 or 7 or after 1 or 2 amino acid substitutions are made to SEQ ID NO: 3, 4, 5, 6 or 7 Amino acid sequence; CDR2 amino acid sequence as shown in SEQ ID NO: 8, 9, 10, 11 or 12 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 8, 9, 10, 11 or 12;
  • the amino acid sequence of CDR3 is as shown in SEQ ID NO: 13, 14, 15, 16 or 17 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 13, 14, 15, 16 or 17;
  • the light chain variable region CDR1 amino acid sequence is as shown in SEQ ID NO: 18, 19, 20, 21 or 22 or after 1 or 2 amino acid substitutions to SEQ ID NO: 18, 19, 20, 21 or 22 Amino acid sequence; CDR2 amino acid sequence as shown in SEQ ID NO: 23, 24, 25, 26 or 27 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 23, 24, 25, 26 or 27;
  • the CDR3 amino acid sequence is as shown in SEQ ID NO: 28, 29, 30, 31 or 32 or the amino acid sequence after 1 or 2 amino acid substitutions are carried out to SEQ ID NO: 28, 29, 30, 31 or 32.
  • anti-Claudin18.2 antibody or antigen-binding fragment provided by the present invention, in some specific embodiments, wherein:
  • the amino acid sequence of CDR 1-3 of the heavy chain variable region is SEQ ID NO: 3, 8, 13 or the amino acid sequence after performing 1 or 2 amino acid substitutions to SEQ ID NO: 3, 8, 13; and/or
  • the light chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 18, 23, 28 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 18, 23, 28;
  • the amino acid sequence of CDR 1-3 of the heavy chain variable region is SEQ ID NO: 4, 9, 14 or the amino acid sequence after performing 1 or 2 amino acid substitutions to SEQ ID NO: 4, 9, 14; and/or
  • the light chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 19, 24, 29 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 19, 24, 29;
  • the amino acid sequence of CDR 1-3 of the heavy chain variable region is SEQ ID NO: 5, 10, 15 or the amino acid sequence after 1 or 2 amino acid substitutions to SEQ ID NO: 5, 10, 15; and/or
  • the light chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 20, 25, 30 or the amino acid sequence after carrying out 1 or 2 amino acid substitutions to SEQ ID NO: 20, 25, 30;
  • the heavy chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 6, 11, 16 or the amino acid sequence after 1 or 2 amino acid substitutions to SEQ ID NO: 6, 11, 16; and/or
  • the light chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 21, 26, 31 or the amino acid sequence after 1 or 2 amino acid substitutions are carried out to SEQ ID NO: 21, 26, 31;
  • the amino acid sequence of CDR 1-3 of the heavy chain variable region is SEQ ID NO: 7, 12, 17 or the amino acid sequence after 1 or 2 amino acid substitutions to SEQ ID NO: 7, 12, 17; and/or
  • the light chain variable region CDR 1-3 amino acid sequence is SEQ ID NO: 22, 27, 32 or the amino acid sequence after performing 1 or 2 amino acid substitutions to SEQ ID NO: 22, 27, 32.
  • the antibody or antigen-binding fragment thereof provided by the present invention comprises a variable region selected from the group consisting of:
  • amino acid sequence of the heavy chain variable region is shown in SEQ ID NO: 1, or it has the same CDR 1-3 with SEQ ID NO: 1 and the identity is greater than 80%, 85% compared with SEQ ID NO: 1 %, 90%, 95%, 96%, 97%, 98%, 99% of the sequence; and/or
  • amino acid sequence of the heavy chain variable region of the anti-Claudin18.2 antibody involved in the present invention is as follows (SEQ ID NO: 1):
  • amino acid sequence of the light chain variable region of the anti-Claudin18.2 antibody involved in the present invention is as follows (SEQ ID NO: 2):
  • the antibody or antigen-binding fragment thereof provided by the present invention, wherein: (1) the amino acid sequence of the heavy chain is as shown in SEQ ID NO: 33; and/or (2) the amino acid sequence of the light chain As shown in SEQ ID NO:34.
  • L is any linking group, which is covalently linked to the antibody or its antigen-binding fragment Ab and the active drug unit D;
  • one or more active drug units D are linked to the Ab via one or more linking groups L.
  • said L is a cleavable linker and a non-cleavable linker.
  • the cleavable linker includes a peptide unit, and the peptide unit contains 2-20 amino acids, and preferably the peptide unit is selected from the group consisting of -valine-citrulline-(-Val-Cit -), -Glycine-Glycine-Phenylalanine-Glycine-(-Gly-Gly-Phe-Gly-), -Valine-Alanine-(-Val-Ala-), -Valine-Lys Acid-(-Val-Lys-), -Valine-Arginine-(-Val-Arg-), -Phenylalanine-Citrulline-(-Phe-Cit-), -Phenylalanine Acids -Lysine-(-Phe-Lys-), -Phenylalanine-Arginine-(-Phe-Arg-), and combinations thereof.
  • the antibody-drug conjugate described in any one of the foregoing is characterized in that the L includes an existing linker structure (pages 7-10 of the Chinese invention patent specification with patent publication number CN110997010A):
  • the active drug unit D is cytotoxic molecules, cell differentiation factors, stem cell trophic factors, steroid drugs, drugs for treating autoimmune diseases, anti-inflammatory drugs or drugs for treating infectious diseases; preferably, the Cytotoxic molecules include but are not limited to tubulin inhibitors or DNA damage agents, said tubulin inhibitors include but are not limited to dolastatin (dolastatin) and auristatin (auristatin) class cytotoxic molecules, maytansine ( maytansine) class of cytotoxic molecules; the DNA damaging agents include but are not limited to calicheamicins, duocarmycins, antramycin derivatives PBD, camptothecins and Camptothecin derivatives, SN-38; more preferably, the auristatin (auristatin) cytokine molecules include but not limited to MMAE or MMAF or their derivatives, and the maytansinoid cytotoxic molecules include But not limited to DM1, DM4 or their derivatives. Furthermore, the active drug unit D includes the
  • the present invention provides an antibody drug conjugate (ie Ab--Mc-Val-Cit-PAB-MMAE) with the following structure:
  • p is an integer selected from 1, 2, 3, 4, 5, 6, 7, and 8.
  • the present invention provides an antibody drug conjugate (ie Ab-D07-Val-Cit-PAB-MMAE) with the following structure:
  • q is an integer selected from 1, 2, 3, 4.
  • the present invention provides an antibody drug conjugate (ie Ab--PY-Val-Cit-MMAE) with the following structure:
  • q is an integer selected from 1, 2, 3, 4.
  • the present invention also provides an isolated polynucleotide encoding the antibody or antigen-binding fragment thereof according to any one of the foregoing.
  • the present invention also provides a combination of isolated polynucleotides, comprising: a polynucleotide encoding the heavy chain of any of the aforementioned antibodies or antigen-binding fragments thereof and a polynucleotide encoding any of the aforementioned antibodies or their antigens A polynucleotide that binds the light chain of the segment.
  • the present invention also provides a nucleic acid construct comprising the aforementioned polynucleotide.
  • nucleic acid construct is a vector.
  • the present invention also provides a host cell comprising the aforementioned nucleic acid construct or vector.
  • the host cells are prokaryotic cells, eukaryotic cells, yeast cells, mammalian cells, Escherichia coli cells or CHO cells, NSO cells, Sp2/0 cells, BHK cells.
  • the present invention also provides a method for preparing an anti-Claudin18.2 antibody, which comprises culturing the aforementioned host cell under conditions suitable for expressing a vector encoding an anti-Claudin18.2 antibody or an antigen-binding fragment, and recovering the antibody or fragment.
  • the antibody or its antigen-binding fragment, antibody drug conjugate, polynucleotide, polynucleotide combination, nucleic acid construct, carrier, or pharmaceutical composition described in any one of the foregoing is used in the preparation of a drug for treating or preventing cancer
  • the cancer is a solid tumor; further, the solid tumor includes gastric cancer and pancreatic cancer.
  • Figure 1 is a graph showing the change in tumor volume in animals after administration of anti-Claudin18.2 murine antibodies CLN-03-3A7, CLN-03-4E5, and CLN-03-6H2;
  • Figure 2 is a graph showing the body weight changes of animals after administration of anti-Claudin18.2 murine antibodies CLN-03-3A7, CLN-03-4E5, and CLN-03-6H2;
  • Fig. 3 is a comparison chart of affinity detection of chimeric antibodies CLN-03-4E5-01, CLN-03-6H2-01 and IMAB362;
  • Figure 4A shows a comparison of the endocytic efficiency of CLN-03-6H2-01 and IMAB362 in the gastric cancer model KATOIII;
  • Figure 4B shows a comparison of the endocytic efficiency of CLN-03-6H2-01 and IMAB362 in the pancreatic cancer model AsPC-1;
  • Figure 4C shows a comparison of the endocytic efficiency of CLN-03-6H2-01 and IMAB362 in the lung cancer model A549;
  • Figure 5 is flow cytometry detection of RGCLN18.2 and RGCLN18.2-PY-Val-Cit-PAB-MMAE, RGCLN18.2-MC-Val-Cit-PAB-MMAE, RGCLN18.2-D07-Val-Cit- Comparison of endocytosis effects of PAB-MMAE and IMAB362-MC-Val-Cit-MMAE;
  • Fig. 7 is a graph showing the change in tumor volume after administration of RGCLN18.2-MC-Val-Cit-PAB-MMAE, IMAB362-MC-Val-Cit-PAB-MMAE and PBS.
  • CDRs complementarity determining regions
  • identity refers to the two sequences to be compared obtained after optimal alignment (optimal alignment).
  • percentage of identical nucleotides or identical amino acid residues between sequences that is purely statistical and where the differences between the two sequences are randomly distributed over their entire length.
  • a sequence comparison between two nucleic acid or amino acid sequences is generally performed by comparing the sequences after they have been optimally matched, which comparison can be performed by segment or by a "comparison window".
  • optimal alignment for comparing sequences can also be achieved by the local homology algorithm of Smith and Waterman (1981) [Ad.App.Math.2:482], by Neddleman and Wunsch's (1970 ) [J.MoI.Biol.48:443] local homology algorithm, by Pearson and Lipman's (1988) [Proc.Natl.Acad.Sci.USA 85:2444) similarity search method, by using these algorithms Computer software implementation (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group, 575 Science Dr., Madison, WI, or comparison software by BLAST N or BLAST P).
  • antibody is used in the broadest sense and encompasses various antibody structures including, but not limited to, monoclonal antibodies, multispecific antibodies (e.g., bispecific antibodies); as used herein, "antigen-binding fragment” refers to Antibody fragments consist of or comprise partial sequences of the heavy or light variable chains of the antibody from which they were derived, sufficient to retain the same binding specificity and sufficient affinity as that of the antibody from which they were derived, preferably at least 1/3 the affinity of the antibody from which they were derived. 100, in a more preferred manner at least equal to 1/10. Such functional fragments will comprise a minimum of 5 amino acids, preferably 10, 15, 25, 50 and 100 contiguous amino acids of the antibody sequence from which they are derived.
  • a heavy chain comprises a heavy chain variable region (abbreviated VH) and a heavy chain constant region.
  • the heavy chain constant region consists of three domains, CH1, CH2 and CH3.
  • a light chain comprises a light chain variable region (abbreviated VL) and a light chain constant region.
  • the light chain constant region comprises one domain, CL.
  • the VH and VL regions can be subdivided into regions of high variability called complementarity determining regions (CDRs), interspersed with more conserved regions called framework regions (FRs).
  • CDRs complementarity determining regions
  • FRs framework regions
  • Each VH and VL consists of three CDRs and four FRs, arranged from amino-terminus to carboxyl-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4.
  • These variable regions of the heavy and light chains contain the binding domains that interact with the antigen.
  • the constant region of the antibody can mediate the binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (such as effector cells) and the first component (Clq) of the classical complement system.
  • Chimeric or humanized antibodies are also encompassed by antibodies according to the invention.
  • humanized antibody refers to an antibody comprising CDR regions derived from a non-human antibody, and other parts of the antibody molecule derived from one (or several) human antibodies. Moreover, in order to retain binding affinity, some residues of the backbone (called FR) segments can be modified (Document 8: Jones et al., Nature, 321:522-525, 1986; Verhoeyen et al., Science, 239:1534 -1536, 1988; Riechmann et al., Nature, 332:323-327, 1988.). Humanized antibodies or fragments thereof according to the present invention can be prepared by techniques known to those skilled in the art (Document 9: Singer et al., J. Immun.
  • chimeric antibody refers to an antibody in which the variable region sequences are from one species and the constant region sequences are from another species, eg, an antibody in which the variable region sequences are from a mouse antibody and the constant region sequences are from a human antibody.
  • the chimeric antibody or fragment thereof according to the present invention can be prepared by using gene recombination technology.
  • said chimeric antibodies can be produced by cloning recombinant DNA comprising a promoter and sequences encoding the variable regions of non-human, especially murine monoclonal antibodies according to the invention, and sequences encoding the constant regions of human antibodies .
  • the chimeric antibody of the present invention encoded by such a recombinant gene will be, for example, a mouse-human chimera whose specificity is determined by a variable region derived from murine DNA and whose isotype is determined by a variable region derived from human DNA. to determine the constant region.
  • a method of preparing a chimeric antibody for example, the document Verhoeyn et al. (BioEssays, 8: 74, 1988) can be referred to.
  • monoclonal antibody refers to a preparation of antibody molecules of single molecular composition. Monoclonal antibody compositions exhibit a single binding specificity and affinity for a particular epitope.
  • isolated nucleic acid molecule is a nucleic acid molecule identified and separated from at least one contaminant nucleic acid molecule with which it is normally associated in the natural source of the antibody nucleic acid.
  • An isolated nucleic acid molecule differs in form or environment from that as it is found in nature.
  • An isolated nucleic acid molecule thus is distinguished from the nucleic acid molecule as it exists in natural cells.
  • an isolated nucleic acid molecule includes a nucleic acid molecule contained in cells that ordinarily express antibodies where, for example, the nucleic acid molecule is at a different chromosomal location than natural cells.
  • Claudin18.2 knockout mice from Biocytogen (Beijing) Pharmaceutical Technology Co., Ltd.) were immunized with cells containing a eukaryotic expression plasmid encoding the first extracellular domain protein of Claudin18.2 as an immunogen.
  • a total of 22 murine antibody strains were screened, namely: CLN-40-3C8, CLN-07-4C3, CLN-39-8D11, CLN-39-1E1, CLN-03-6H2, CLN-03-4E5, CLN- 03-1A8, CLN-03-4A11, CLN-07-5B10, CLN-07-5G11, CLN-03-3A7, CLN-03-4C11, CLN-38-4H3, CLN-03-4G7, CLN-39- 1B6, CLN-39-3E7, CLN-03-1F5, CLN-38-8A1, CLN-39-7H7, CLN-03-6G10, CLN-40-6C9, CLN-07-5D9.
  • the FACS method was used to detect the binding activity of the obtained 22 murine antibodies to Claudin18.2. Dilute the sample to the final concentration: 10ug/mL, 1ug/mL, 0.1ug/mL, 0.01ug/mL, 0.001ug/mL, react with CHO-Claudin18.2 cells at 4°C for 30min, centrifuge and discard the supernatant Add 200 ⁇ l PBS to each well, 2000rpm, 5min, wash 2 times, add 50 ⁇ L 1:100 times diluted anti-mouse IgG Fc-FITC antibody (Abcam, Cat. No. ab97264) to each well, react at 4°C for 30min, and then repeat the washing step. Wash once, and finally add 200 ⁇ L PBS to each well, resuspend, and test on the machine. The test results are shown in Table 3, and the polyclonal antibodies showed good binding activity.
  • CLN-03-4E5-01 and CLN-03-6H2-01 chimeric antibodies were obtained after the chimeric antibody transformation of the two murine antibodies CLN-03-4E5 and CLN-03-6H2 respectively.
  • the affinity of CLN-03-4E5-01, CLN-03-6H2-01 and IMAB362 was compared. The results can be seen (as shown in Table 4 and Figure 3), CLN-03-4E5-01, CLN-03-6H2-01 and IMAB362 all showed good affinity activity, and CLN-03-4E5-01 provided by the invention 01 and CLN-03-6H2-01 had better binding activity than IMAB362.
  • the time gradient is set as: 0h, 2h, 4h, 6h, 8h, 12h, 24h, and the concentration gradient is set as: 0.1nM, 1nM, 10nM. After each sampling point, the fluorescence intensity was detected by flow cytometry.
  • the chimeric antibody CLN-03-6H2-01 was humanized by grafting light chain or heavy chain CDRs to immunoglobulin light chain or heavy chain framework regions.
  • the CDRs of the light and heavy chains of the chimeric antibody CLN-03-6H2-01 were determined using the Kabat system.
  • the framework region of human IgG1 was determined by comparing the antibody variable region database.
  • the light chain variable region sequences of different humanized Clandin 18.2 antibodies and the heavy chain variable region sequences of different humanized Clandin 18.2 antibodies were designed and synthesized.
  • the humanized Clandin 18.2 antibody light chain variable region and human kappa constant region were fused by PCR to obtain the full-length humanized Clandin 18.2 light chain; the humanized Clandin 18.2 heavy chain variable region and IgG1 constant region were fused by PCR method Fusion to obtain the full length of humanized Clandin 18.2 heavy chain.
  • Different light and heavy chains were combined and expressed, and the affinity of the purified multiple strains of humanized antibodies was detected by flow cytometry (FACS) (see Table 5), and the antibody H-1 with the best affinity was selected (named RGCLN18.2 Antibody) for sequencing.
  • Table 6 shows the CDR amino acid sequences (Kabat numbering) of the light and heavy chains of the RGCLN18.2 antibody.
  • RGCLN18.2 antibody light chain variable region amino acid sequence (SEQ ID NO: 2):
  • ADC antibody-drug conjugate
  • TCEP Tris-2-carboxyethyl-phosphine
  • DTPA Diethylene triamine pentacetate acid
  • the amount of reducing agent can be added within a certain concentration range according to the required coupling rate, and mixed with a certain concentration of monoclonal antibody (such as: 5 ⁇ 30mg/mL) according to a certain volume ratio (1:1), TCEP
  • the molar ratio of the final concentration of the antibody to the antibody is 0.5-6.0:1, and the reaction is stirred at 25°C for 1 hour.
  • Antibodies after TCEP reduction can be directly conjugated.
  • linker-active drug unit compounds used in this embodiment are MC-Val-Cit-PAB-MMAE, D07-Val-Cit-PAB-MMAE and Py-MAA-Val-Cit-PAB-MMAE, and their structural formulas are as follows (see patent applications CN108853514A (page 14 of the specification), CN111433188A (page 53 of the specification) and WO2019223579A1 (pages 25-27 of the specification) for the synthesis methods.
  • ADC (p is an integer selected from 1, 2, 3, 4, 5, 6, 7, 8, q is an integer selected from 1, 2, 3, 4, Ab is provided by the present invention RGCLN18.2 antibody), the average DAR of these ADCs was 3.5-4.5.
  • RGCLN18.2, RGCLN18.2-PY-Val-Cit-PAB-MMAE, RGCLN18.2-MC-Val-Cit-PAB-MMAE, RGCLN18.2-D07-Val-Cit-PAB-MMAE were mixed with pHAb amine Reactive dyes were conjugated and then diluted to 10 ⁇ g/ml with cell culture medium. 100 [mu]l of the dye complex of RGCLN18.2 and ADC was added to the cells and incubated at 37[deg.] C.
  • the human gastric cancer cell NCI-N87 cell line suspension was added to a 96-well plate at a density of 100 ⁇ L/well and 5000 cells/well, and placed in a water-saturated 37°C CO 2 incubator for overnight cultivation.
  • Antibody drug conjugates (RGCLN18.2-PY-Val-Cit-PAB-MMAE, RGCLN18.2-D07-Val-Cit-PAB-MMAE, RGCLN18.2-MC-Val-Cit-PAB-MMAE, IMAB362 -MC-Val-Cit-MMAE) concentration was serially diluted and added to a 96-well plate containing cells, 100 ⁇ L/well. Continue to culture in a 37°C incubator for 72 hours.
  • IR% (OD blank-OD drug) ⁇ 100/OD blank.
  • the IC50 value was calculated by the curve fitting software Softmax Pro7.0.3 Gxp, and the results are shown in Table 7. From the above experimental data in vitro efficacy test, it was found that RGCLN18.2-PY-Val-Cit-PAB-MMAE, RGCLN18.2-MC-Val-Cit-PAB-MMAE, RGCLN18.2-D07-Val-Cit- The growth inhibition effect of PAB-MMAE ADC was better than that of IMAB362-MC-Val-Cit-MMAE.

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Abstract

提供了一种靶向Claudin 18.2的抗体、抗体药物偶联物及其在治疗癌症中的用途。还提供了编码上述Claudin 18.2抗体的核苷酸、多核苷酸组合、表达载体及表达载体组合、包含上述Claudin 18.2的抗体、抗体药物偶联物的药物组合物以及它们在制备治疗或预防癌症药物中的应用。

Description

一种抗Claudin18.2抗体及其抗体药物偶联物 技术领域
本发明涉及生物医药领域，尤其涉及一种抗Claudin18.2抗体及其抗体药物偶联物，本发明还涉及上述抗体及其抗体药物偶联物的用途。
背景技术
近年来，全球恶性肿瘤的总体发病率呈现持续升高的趋势，严重威胁着人类的健康和生存。目前临床上治疗恶性肿瘤主要以手术、化疗和放疗为主，但是都很难达到满意的疗效。抗体药物偶联物(antibody-drug conjugate，ADC)是一种通过化学连接子(Linker)将具有生物活性的药物(Drug)和抗体(Antibody)连接起来的一类生物药。近些年，多个抗体药物偶联物在治疗恶性肿瘤方面取得了突破性的进展，使其成为了继手术、化疗、放疗后的一大新兴治疗方法。但截止到2021年3月，全球仅批准了11种抗体偶联药物(美国FDA批准了10种，日本PMDA批准了一种)，且获批适应症种类较少，远不能满足目前恶性肿瘤患者的临床需求。
表1已上市抗体药物偶联物
Figure PCTCN2022091353-appb-000001
Figure PCTCN2022091353-appb-000002
注：Mylotarg于2000年获批上市后在2010年撤市，后于2017年重新获批上市。
细胞连接密蛋白(Claudins或CLDNs)广泛分布于各种上皮组织，是细胞紧密连接的重要结构成分。研究发现，CLDNs蛋白与上皮细胞维持渗透压、屏障功能以及细胞极性密切相关(文献1：Gunzel D.Claudins:vital partners in transcellular and paracellular transport coupling[J].Pflugers Arch,2017,469(1):35-44.)，且参与对病原体的免疫防御过程(文献2：Colpitts CC,Baumert TF.Claudins in viral infection:from entry to spread[J].Pflugers Arch,2017,469(1):27-34.)。另外，CLDNs被证实在许多肿瘤的发生发展过程中存在表达模式的改变，将CLDNs谱系作为特异性标志蛋白的靶向治疗研究已得到广泛关注。但是，尽管大部分的CLDNs广泛表达，但其中的个别成员如CLDN 18蛋白往往高度选择性地表达于胃肠道等特定组织。CLDN 18基因位于人第3号染色体的3q22.3，其基因第一个外显子有两种选择，由此形成两种不同的剪切突变体，可表达出N端69个不同氨基酸序列的两种蛋白亚型，分别为Claudin 18.1蛋白和CLDN 18.2蛋白(文献3：Hayashi D,Tamura A,Tanaka H,et al.Deficiency of claudin-18 causes paracellular H+leakage,up-regulation of interleukin-1β,and atrophic gastritis in mice[J].Gastroenterology,2012,142(2):292-304.)，其中Claudin 18.1蛋白是肺泡上皮细胞选择性表达的特异性抗原，仅在正常肺泡组织中高度表达，而在其他正常组织包括胰管等组织均未发现(文献4：Li G,Flodby P,Luo J,et al.Knockout mice reveal key roles for clau‐din 18 in alveolar barrier properties and fluid homeostasis[J].Am J Respir Cell Mol Biol,2014,51(2):210-222.)；Claudin 18.2蛋白也是一种具有高度选择性的标志蛋白，但其分布的组织与Claudin 18.1蛋白完全不同。Claudin 18.2蛋白在正常健康组织中表达高度受限，但在胃癌、乳腺癌、结肠癌、肝癌、头颈癌、支气管癌以及非小细胞肺癌等多种原发恶性肿瘤中异常激活和过度表达，尤其好发于消化系统恶性肿瘤，包括胃癌(70％)，胰腺癌(50％)，食管癌(30％)等(文献5：Kumar V,Soni P,Garg M,et al.Emerging Therapies in the Manage‐ment of Advanced-Stage Gastric Cancer[J].Front Pharmacol,2018,9:404.)。另有研究表明，CLDN 18.2蛋白的表达并不局限于原发灶，在 转移灶中也高度表达，可能参与恶性肿瘤细胞增殖和趋化转移的过程(文献6：Woll S,Schlitter AM,Dhaene K,et al.Claudin 18.2 is a target for IMAB362 antibody in pancreatic neoplasms[J].Int J Cancer,2014,134(3):731-739；文献7：Jiang H,Shi Z,Wang P,et al.Claudin18.2-Specific Chimeric Antigen Receptor Engineered T Cells for the Treatment of Gastric Cancer[J].J Natl Cancer Inst,2018,111(4):1-10.)。因此，Claudin 18.2是一种非常理想的肿瘤患者标记物和抗肿瘤药物开发靶点，特别是胃癌、胰腺癌、食管癌、肺癌、卵巢癌等，但是由于其靶点的特殊性(结构与Claudin 18.1高度相似，且二者胞外区第一结构域完全相同)，Claudin 18.2治疗性抗体的开发非常困难，这也是限制Claudin 18.2靶向药物开发的主要原因。
目前靶向Claudin 18.2的抗体药物偶联物均处于临床前研究阶段，尚无一款推进到临床阶段。因此，开发靶向Claudin 18.2的抗体药物偶联物为临床提供更多的选择已迫在眉睫。
发明内容
本发明提供了一种靶向Claudin 18.2的抗体、抗体药物偶联物及其在治疗癌症中的用途。本发明还提供了编码上述Claudin 18.2抗体的的核苷酸、多核苷酸组合、表达载体及表达载体组合、包含上述Claudin 18.2的抗体、抗体药物偶联物的药物组合物以及它们在制备治疗或预防癌症药物中的应用。
具体的，本发明提供了一种抗Claudin18.2抗体或其抗原结合片段，所述抗体或其抗原结合片段包括重链可变区和轻链可变区，所述重链可变区的CDR和/或所述轻链可变区的CDR与如下序列限定的抗体具有相同的CDR序列或在如下序列限定的抗体的CDR上进行1-2个氨基酸替换，所述序列限定的抗体为：
(1)重链可变区氨基酸序列为SEQ ID NO:1所示；和/或
(2)轻链可变区氨基酸序列为SEQ ID NO:2所示。
在特定实施方案中，根据采用不同的测定方法或系统认定，相应重链和轻链可变区的互补决定区CDR1-3如表2所示。
表2重链和轻链可变区CDR1-3氨基酸序列
Figure PCTCN2022091353-appb-000003
Figure PCTCN2022091353-appb-000004
进一步的，本发明还提供了一种抗Claudin18.2抗体或抗原结合片段，在某些具体实施方案中，其包含重链和轻链可变区序列，其中
(1)重链可变区CDR1氨基酸序列如SEQ ID NO:3、4、5、6或7所示或对SEQ ID NO:3、4、5、6或7进行1或2个氨基酸替换后的氨基酸序列；CDR2氨基酸序列如SEQ ID NO:8、9、10、11或12所示或对SEQ ID NO:8、9、10、11或12进行1或2个氨基酸替换后的氨基酸序列；CDR3氨基酸序列如SEQ ID NO:13、14、15、16或17所示或对SEQ ID NO:13、14、15、16或17进行1或2个氨基酸替换后的氨基酸序列；
(2)轻链可变区CDR1氨基酸序列如SEQ ID NO:18、19、20、21或22所示或对SEQ ID NO:18、19、20、21或22进行1或2个氨基酸替换后的氨基酸序列；CDR2氨基酸序列如SEQ ID NO:23、24、25、26或27所示或对SEQ ID NO:23、24、25、26或27进行1或2个氨基酸替换后的氨基酸序列；CDR3氨基酸序列如SEQ ID NO:28、29、30、31或32所示或对SEQ ID NO:28、29、30、31或32进行1或2个氨基酸替换后的氨基酸序列。
进一步的，本发明提供的抗Claudin18.2抗体或抗原结合片段，在某些具体的实施方案中，其中：
(1)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:3、8、13或对SEQ ID NO:3、8、13进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:18、23、28或对SEQ ID NO:18、23、28进行1或2个氨基酸替换后的氨基酸序列；
(2)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:4、9、14或对SEQ ID NO:4、9、14进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:19、24、29或对SEQ ID NO:19、24、29进行1或2个氨基酸替换后的氨基酸序列；
(3)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:5、10、15或对SEQ ID NO:5、10、15进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:20、25、30或对SEQ ID NO:20、25、30进行1或2个氨基酸替换后的氨基酸序列；
(4)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:6、11、16或对SEQ ID NO:6、11、16进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:21、26、31或对SEQ ID NO:21、26、31进行1或2个氨基酸替换后的氨基酸序列；
(5)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:7、12、17或对SEQ ID NO:7、12、17进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:22、27、32或对SEQ ID NO:22、27、32进行1或2个氨基酸替换后的氨基酸序列。
在某些具体实施方案中，本发明所提供的抗体或其抗原结合片段，其包括选自如下一组的可变区：
(1)重链可变区的氨基酸序列如SEQ ID NO:1所示，或与SEQ ID  NO:1具有相同的CDR 1-3且与SEQ ID NO:1相比同一性大于80％、85％、90％、95％、96％、97％、98％、99％的序列；和/或
(2)轻链可变区的氨基酸序列如SEQ ID NO:2所示，或与SEQ ID NO:2具有相同的CDR 1-3且与SEQ ID NO:2相比同一性大于80％、85％、90％、95％、96％、97％、98％、99％的序列。
在特定的实施例中，本发明涉及的抗Claudin18.2抗体的重链可变区氨基酸序列如下(SEQ ID NO:1)：
Figure PCTCN2022091353-appb-000005
在特定的实施例中，本发明涉及的抗Claudin18.2抗体的轻链可变区氨基酸序列如下(SEQ ID NO:2)：
Figure PCTCN2022091353-appb-000006
在特定的实施例中，本发明涉及的抗Claudin18.2的：(1)重链可变区的氨基酸序列如SEQ ID NO:1所示；和/或(2)轻链可变区的氨基酸序列如SEQ ID NO:2所示。
在某些具体实施方案中，本发明所提供的抗体或其抗原结合片段，其中：(1)重链的氨基酸序列如SEQ ID NO:33所示；和/或(2)轻链的氨基酸序列如SEQ ID NO:34所示。
本发明所提供的抗体可以是单克隆抗体、Fab、Fab'、Fab'-SH、F(ab')2、Fv、单链Fv(“scFv”)、双抗体、双特异性抗体、多特异性抗体、嵌合抗体、人源化抗体或包含抗体的抗原结合部分的融合蛋白；优选的，所述的抗体为人源化单克隆抗体。
本发明所提供的抗体进一步包括人或鼠恒定区；优选的，所述恒定区选自IgG1、IgG2、IgG3、IgG4。
本发明还提供了一种抗体药物偶联物，其含有前述任一项所述的抗体或其抗原结合片段。
进一步的，所述的抗体药物偶联物结构如式(I)所示：
Ab-L-D    (I)
其中：
Ab为前述任一项所述的抗体或其抗原结合片段；
D为活性药物单元；
L为任一连接基团，其分别与抗体或其抗原结合片段Ab及活性药物单元D共价连接；
其中，所述Ab上通过一个或多个连接基团L连接一个或多个活性药物单元D。
进一步的，所述的L与抗体Ab上氨基残基或巯基残基共价连接；优选的，所述L与抗体Ab上的巯基残基共价连接；更优选的，所述L与抗体Ab上的链间二硫健打开后形成的巯基残基共价连接。
进一步的，所述的L为可裂解连接子和不可裂解连接子。
更进一步的，所述的可裂解连接子包括肽单元，所述的肽单元包含2-20个氨基酸，优选的所述的肽单元选自由-缬氨酸-瓜氨酸-(-Val-Cit-)、-甘氨酸-甘氨酸-苯丙氨酸-甘氨酸-(-Gly-Gly-Phe-Gly-)、-缬氨酸-丙氨酸-(-Val-Ala-)、-缬氨酸-赖氨酸-(-Val-Lys-)、-缬氨酸-精氨酸-(-Val-Arg-)、-苯丙氨酸-瓜氨酸-(-Phe-Cit-)、-苯丙氨酸-赖氨酸-(-Phe-Lys-)、-苯丙氨酸-精氨酸-(-Phe-Arg-)及它们的组合。
进一步的，前述任一项所述的抗体药物偶联物，其特征在于，所述的L包括现有的连接子结构(专利公开号为CN110997010A的中国发明专利说明书第7-10页)：
Figure PCTCN2022091353-appb-000007
Figure PCTCN2022091353-appb-000008
Figure PCTCN2022091353-appb-000009
Figure PCTCN2022091353-appb-000010
进一步的，所述的活性药物单元D为细胞毒分子、细胞分化因子、干细胞营养因子、类固醇类药物、治疗自身免疫疾病的药物、抗炎症药物或治疗传染性疾病的药物；优选的，所述细胞毒分子包括但不限于微管蛋白抑制剂或DNA损伤剂，所述微管蛋白抑制剂包括但不限于海兔毒素(dolastatin)及奥瑞他汀(auristatin)类细胞毒分子，美登素(maytansine)类细胞毒分子；所述DNA损伤剂包括但不限于卡奇霉素类(calicheamicin)、倍癌霉素(duocarmycin)类、安曲霉素类衍生物PBD、喜树碱(camptothecins)及喜树碱类衍生物、SN-38；更优选的，所述奥瑞他汀(auristatin)类细胞素分子包括但不限于MMAE或MMAF或它们的衍生物，所述美登素类细胞毒分子包括但不限于DM1、DM4或它们的衍生物。更进一步的，所述的活性药物单元D包含现有的用于ADC中的活性药物单元(专利公开号为CN110997010A的中国发明专利说明书第12-14页)：
Figure PCTCN2022091353-appb-000011
Figure PCTCN2022091353-appb-000012
在一些优选的实施例中，本发明提供了如下结构的抗体药物偶联物(即Ab--Mc-Val-Cit-PAB-MMAE)：
Figure PCTCN2022091353-appb-000013
其中，p为选自1、2、3、4、5、6、7、8的整数。
在另一些优选的实施例中，本发明提供了如下结构的抗体药物偶联物(即Ab-D07-Val-Cit-PAB-MMAE)：
Figure PCTCN2022091353-appb-000014
其中，q为选自1、2、3、4的整数。
在另一些优选的实施例中，本发明提供了如下结构的抗体药物偶联物(即Ab--PY-Val-Cit-MMAE)：
Figure PCTCN2022091353-appb-000015
其中，q为选自1、2、3、4的整数。
本发明还提供了一种分离的多核苷酸，其编码前述任一项所述的抗体或其抗原结合片段。
本发明还提供了一种分离的多核苷酸的组合，其包括：编码前述任一项所述抗体或其抗原结合片段之重链的多核苷酸和编码前述任一项所述抗体或其抗原结合片段之轻链的多核苷酸。
本发明还提供了一种核酸构建体，其包含前述所述的多核苷酸。
进一步的，所述核酸构建体为载体。
本发明还提供了一种宿主细胞，其包含前述所述的核酸构建体或载体。
进一步的，所述的宿主细胞是原核细胞、真核细胞、酵母细胞、哺乳动物细胞、大肠杆菌细胞或CHO细胞、NS0细胞、Sp2/0细胞、BHK细胞。
本发明还提供了一种药物组合物，包含前述任一项所述的抗体或其抗原结合片段和/或抗体药物偶联物，以及药学上可接受的载体。
本发明还提供了一种制备抗Claudin18.2抗体的方法，其包括在适合表达编码抗Claudin18.2抗体或抗原结合片段的载体的条件下培养前述所述的宿主细胞，并且回收所述抗体或片段。
前述任一项所述的抗体或其抗原结合片段、抗体药物偶联物、多核苷酸、多核苷酸组合、核酸构建体、载体、或药物组合物在制备用于治疗或预防癌症的药物中的用途，其中所述癌症为实体瘤；进一步的，所述实体瘤包括胃癌、胰腺癌。
附图说明
图1为抗Claudin18.2鼠源抗体CLN-03-3A7、CLN-03-4E5、CLN-03-6H2给药后动物肿瘤体积变化曲线图；
图2为抗Claudin18.2鼠源抗体CLN-03-3A7、CLN-03-4E5、CLN-03-6H2给药后动物体重变化曲线图；
图3为嵌合抗体CLN-03-4E5-01、CLN-03-6H2-01及IMAB362亲和力检测对比图；
图4A显示了在胃癌模型KATOIII中CLN-03-6H2-01和IMAB362的内吞效率对比图；
图4B显示了在胰腺癌模型AsPC-1中CLN-03-6H2-01和IMAB362的内吞效率对比图；
图4C显示了在肺癌模型A549中CLN-03-6H2-01和IMAB362的内吞效率对比图；
图5为流式细胞法检测RGCLN18.2及 RGCLN18.2-PY-Val-Cit-PAB-MMAE、RGCLN18.2-MC-Val-Cit-PAB-MMAE、RGCLN18.2-D07-Val-Cit-PAB-MMAE、IMAB362-MC-Val-Cit-MMAE的内吞效果对比图；
图6为RGCLN18.2-MC-Val-Cit-PAB-MMAE、IMAB362-MC-Val-Cit-PAB-MMAE及PBS给药后动物体重变化曲线图；
图7为RGCLN18.2-MC-Val-Cit-PAB-MMAE、IMAB362-MC-Val-Cit-PAB-MMAE及PBS给药后荷瘤体积变化曲线图。
具体实施方式
[定义]
除非另有定义，本文使用的所有科技术语具有本领域普通技术人员所理解的相同含义。关于本领域的定义及术语，专业人员具体可参考Current Protocols in Molecular Biology(Ausubel)。氨基酸残基的缩写是本领域中所用的指代20个常用L-氨基酸之一的标准3字母和/或1字母代码。
在本发明中，抗体可变域的互补决定区(CDR)测定或编号方法包括本领域熟知的IMGT、Kabat、Chothia、AbM以及Contact法。
对本发明来说，两种核酸或者氨基酸序列间的“一致性”、“同一性”或“相似性”是指，在最佳比对(最优比对)后所获得的、待比较的两序列之间相同核苷酸或相同氨基酸残基的百分数，该百分数是纯粹统计学的并且两种序列间的差异随机分布并覆盖其全长。两种核酸或者氨基酸序列之间的序列比较通常是在以最优方式使它们匹配以后，通过比较这些序列而进行，所述比较能够通过区段或者通过“比较窗”实施。除了能够手工实施外，用于比较序列的最优比对，还能够通过Smith和Waterman(1981)[Ad.App.Math.2：482]的局部同源性算法、通过Neddleman和Wunsch的(1970)[J.MoI.Biol.48：443]局部同源性算法、通过Pearson和Lipman的(1988)[Proc.Natl.Acad.Sci.USA 85：2444)相似性搜索方法、通过使用这些算法的计算机软件实施(GAP、BESTFIT、FASTA和TFASTA in the Wisconsin Genetics Software Package，Genetics Computer Group，575Science Dr.，Madison，WI，或者通过BLAST N or BLAST P比较软件)。
本文所使用的“抗体”以最广义使用，并且涵盖各种抗体结构，包括但不限于单克隆抗体、多特异性抗体(例如双特异性抗体)；本文所使用的 “抗原结合片段”是指抗体片段由其来源抗体的重或轻可变链的部分序列构成或者包含它们，所述部分序列足以保留与其来源抗体相同的结合特异性和充分的亲和力，优选至少等于其来源抗体亲和力的1/100，在更优选方式中至少等于1/10。这种功能片段将包含最少5个氨基酸，优选其来源的抗体序列的10、15、25、50和100个连续氨基酸。包括(特别是)Fab、F(ab')、F(ab')2、Fv、dAb、Fd、互补决定区(CDR)片段、单链抗体(scFv)、二价单链抗体，其含有至少一个足以使得特异性抗原结合于该多肽的免疫球蛋白片段。上述片段可经合成、或酶法、或通过对完整免疫球蛋白的化学切割而制备，或通过重组DNA技术进行遗传工程改造。其生产的方法在本领域中众所周知。一条重链包含一重链可变区(缩写为VH)和一重链恒定区。重链恒定区包含三个域(domain)，CH1、CH2和CH3。一条轻链包含一轻链可变区(缩写为VL)和一轻链恒定区。该轻链恒定区包含一个域，CL。VH和VL区域还可再细分为具有高可变性的多个区，被称为互补决定区(CDR)，其间散布有更为保守的被称为框架区(FR)的多个区域。每个VH和VL均由三个CDR和四个FR构成，按照以下顺序从氨基端至羧基端排布：FR1、CDR1、FR2、CDR2、FR3、CDR3、FR4。重链和轻链的这些可变区包含与抗原相互作用的结合域。抗体的恒定区可介导免疫球蛋白与宿主的组织或因子结合，包括免疫系统的各种细胞(如效应细胞)和经典补体系统的第一成分(Clq)。嵌合或人源化抗体也涵盖在根据本发明的抗体中。
术语“人源化抗体”是指一种抗体，其包含来源于非人源抗体的CDR区、并且该抗体分子的其他部分来源于一种(或几种)人抗体。而且，为了保留结合亲和力，可以修饰骨架(称为FR)区段的一些残基(文献8：Jones et al.，Nature，321：522-525，1986；Verhoeyen et al.，Science，239：1534-1536，1988；Riechmann et al.，Nature，332：323-327，1988.)。通过本领域技术人员已知的技术可以制备根据本发明的人源化抗体或其片段(文献9：Singer et al.，J.Immun.150：2844-2857，1992；Mountain et al.，Biotechnol.Genet.Eng.Rev.，10：1-142，1992；或Bebbington et al.，Bio/Technology，10：169-175，1992.)。
术语“嵌合抗体”系指以下抗体，其中的可变区序列来自一物种而恒定区序列来自另一物种，例如可变区序列来自小鼠抗体而恒定区序列来自人抗体的抗体。通过使用基因重组技术可以制备根据本发明的嵌合抗体或其片段。例如，所述嵌合抗体可以通过克隆重组DNA来生产，所述重组DNA包含启动子和编码根据本发明的非人尤其是鼠单克隆抗体可变区的 序列、以及编码人抗体恒定区的序列。由这种重组基因编码的本发明嵌合抗体将是，例如，鼠-人嵌合体，该抗体的特异性由来源于鼠DNA的可变区确定，并且其同种型由来源于人DNA的恒定区来确定。对于制备嵌合抗体的方法，例如，可以参考文件Verhoeyn et al.(BioEssays，8：74，1988)。
术语“单克隆抗体”系指具有单一分子组成的抗体分子的制备物。单克隆抗体组合物显示出对于特定表位的单一结合特异性和亲和性。
术语“分离地”核酸分子是从至少一个污染物核酸分子中鉴别与分离的核酸分子，在抗体核酸的天然来源中其一般地与该污染物核酸分子有联系。分离的核酸分子在其形式或环境上与其在自然界中发现时不同。分离的核酸分子因此不同于其在自然细胞中存在的核酸分子。然而，分离的核酸分子包括在通常表达抗体的细胞中加以包含的核酸分子，在该细胞中例如核酸分子位于与自然细胞不同的染色体位置上。
通常，为了制备单克隆抗体或其功能片段，尤其是鼠源的单克隆抗体或其功能片段，可以参考尤其描述在手册“Antibodies”中的技术(文献10：Harlow and Lane，Antibodies：A Laboratory Manual，Cold Spring Harbor Laboratory，Cold Spring Harbor NY，pp.726，1988)或者参考Kohler和Milstein描述的从杂交瘤细胞制备的技术(Nature，256：495-497，1975)。
[实施例]
下面将结合实施例对本发明的实施方案进行详细描述，但是本领域技术人员将会理解，下面实施例仅用于说明本发明，而不应视为限定本发明的范围。
实施例1抗Claudin18.2鼠源抗体筛选及亲和力检测
以包含编码Claudin18.2第一胞外区蛋白的真核表达质粒的细胞作为免疫原免疫Claudin18.2敲除小鼠(来源于百奥赛图(北京)医药科技股份有限公司)。
共筛选获得鼠源抗体22株，分别是：CLN-40-3C8、CLN-07-4C3、CLN-39-8D11、CLN-39-1E1、CLN-03-6H2、CLN-03-4E5、CLN-03-1A8、CLN-03-4A11、CLN-07-5B10、CLN-07-5G11、CLN-03-3A7、CLN-03-4C11、CLN-38-4H3、CLN-03-4G7、CLN-39-1B6、CLN-39-3E7、CLN-03-1F5、CLN-38-8A1、CLN-39-7H7、CLN-03-6G10、CLN-40-6C9、CLN-07-5D9。
采用FACS的方法，检测获得的22株鼠源抗体同Claudin18.2的结合活性。将样品稀释至终浓度依次为：10ug/mL、1ug/mL、0.1ug/mL、0.01ug/mL、0.001ug/mL，分别与CHO-Claudin18.2细胞4℃反应30min后，离心弃上清，每孔加入200μl PBS,2000rpm,5min,洗涤2遍后，每孔加入50μL 1:100倍稀释的anti-mouse IgGFc-FITC抗体(Abcam，货号ab97264)，4℃反应30min，后重复洗涤步骤，洗涤一次，最后每孔加200μL PBS，重悬，上机检测。检测结果如表3所示,多株抗体表现较好的结合活性。
表3抗Claudin18.2鼠源抗体亲和力检测结果
Figure PCTCN2022091353-appb-000016
Figure PCTCN2022091353-appb-000017
实施例2抗Claudin18.2鼠源抗体体内药效评价
选取11株亲和力较好的抗Claudin18.2鼠源抗体(CLN-40-3C8、CLN-07-4C3、CLN-39-8D11、CLN-39-1E1、CLN-03-6H2、CLN-03-4E5、CLN-03-1A8、CLN-03-4A11、CLN-07-5B10、CLN-07-5G11、CLN-03-3A7)，通过胃癌PDX模型选出CLN-03-3A7，CLN-03-4E5，CLN-03-6H2具有治疗潜力，继而对上述3株抗体进行后续的体内药效评价。
将胃癌肿瘤接种于B-NDG小鼠(本小鼠模型由百奥赛图江苏基因生物技术有限公司提供)皮下，待肿瘤体积达到150mm 3时进行分组，每个实验组5只小鼠。分组后，分别将内吞和结合表现较优的鼠源抗体CLN-03-3A7，CLN-03-4E5，CLN-03-6H2按照每周两次10mg/kg的剂量注射入小鼠腹腔，每周两次监测小鼠的肿瘤生长情况(肿瘤体积＝0.5*长径*短径2)。具体结果如图1和图2所示，实验结果显示了Claudin18.2鼠源抗体对肿瘤有明显的抑制作用，并且抗体安全性良好，小鼠的体重没有发生明显变化，且三株鼠源抗体的抑肿瘤活性大小为CLN-03-6H2＞CLN-03-4E5＞CLN-03-3A7。
实施例3嵌合抗体制备及亲和力检测
对CLN-03-4E5和CLN-03-6H2两株鼠源抗体分别进行嵌合抗体改造后获得CLN-03-4E5-01，CLN-03-6H2-01嵌合抗体。比较CLN-03-4E5-01，CLN-03-6H2-01和IMAB362(人鼠嵌合单抗,claudiximab)的亲和力。结果可见(如表4和图3所示)，CLN-03-4E5-01，CLN-03-6H2-01和IMAB362均表现出良好的亲和活性，且本发明提供的CLN-03-4E5-01，CLN-03-6H2-01两株嵌合抗体的结合活性均优于IMAB362。
表4嵌合抗体与IMAB362亲和力EC 50值
名称 EC 50值(μg/ml)
CLN-03-4E5-01 0.4475
CLN-03-6H2-01 0.4103
IMAB362 0.475
实施例4嵌合抗体内吞效率检测
对CLN-03-6H2-01嵌合抗体和IMAB362(人鼠嵌合单抗,claudiximab)的内吞效率进行了检测和比较，按照promega PHAb抗体染料标记试剂盒(Promega G9841)说明书标记纯化的嵌合抗体，抗体标记前浓度为2mg/mL。将标记好的抗体与胃癌模型KATOIII(ATCC)，胰腺癌模型AsPC-1(ATCC)，肺癌模型A549(ATCC)细胞按照一定的浓度梯度，于37℃孵育。时间梯度设置为：0h,2h,4h,6h,8h,12h,24h，浓度梯度设定为：0.1nM,1nM,10nM。每个采样点结束后采用细胞流式仪检测荧光强度。实验结果(参见图4A、图4B和图4C)显示嵌合抗体CLN-03-6H2-01在不同肿瘤细胞系上的内吞效应均优于IMAB362，其中图4A显示了在胃癌模型KATOIII中CLN-03-6H2-01和IMAB362的内吞效率对比，图4B显示了在胰腺癌模型AsPC-1中CLN-03-6H2-01和IMAB362的内吞效率对比，图4C显示了在肺癌模型A549中CLN-03-6H2-01和IMAB362的内吞效率对比。
实施例5嵌合抗体CLN-03-6H2-01的人源化改造
通过移植轻链或重链CDR到免疫球蛋白轻链或重链框架区对嵌合抗体CLN-03-6H2-01进行人源化改造。嵌合抗体CLN-03-6H2-01抗体轻链和重链的CDR用Kabat系统确定。通过对抗体可变区数据库比对，确定人IgG1框架区。设计并合成了不同的人源化Clandin 18.2抗体的轻链可变区序列和不同的人源化Clandin 18.2抗体的重链可变区序列。将人源化Clandin 18.2抗体轻链可变区与人kappa恒定区通过PCR融合，得到人源化Clandin 18.2轻链全长；将人源化Clandin 18.2重链可变区与IgG1恒定区用PCR方法融合，得到人源化Clandin 18.2重链全长。不同轻重链组合并表达，采用流式(FACS)的方法检测纯化后的多株人源化抗体的亲和力(见表5)，选择具有最佳亲和力的H-1号抗体(命名为RGCLN18.2抗体)进行测序。
表5嵌合抗体CLN-03-6H2-01人源化改造抗体亲和力比较
人源化抗体序号 EC50(ug/mL)
H-1 0.1656
H-2 0.2443
H-3 0.3006
H-4 0.3120
H-5 0.3969
H-6 0.3971
H-7 0.4884
H-8 0.5953
H-9 0.8415
H-10 0.8469
H-11 1.009
H-12 1.122
H-13 1.541
H-14 1.636
H-15 1.940
CLN-03-6H2-01 0.462
表6示出了RGCLN18.2抗体轻链和重链的CDR氨基酸序列(Kabat编号)。
表6 RGCLN18.2抗体重链和轻链的氨基酸序列(Kabat编号)
Figure PCTCN2022091353-appb-000018
Figure PCTCN2022091353-appb-000019
RGCLN18.2抗体重链可变区氨基酸序列(SEQ ID NO:1):
Figure PCTCN2022091353-appb-000020
RGCLN18.2抗体轻链可变区氨基酸序列(SEQ ID NO:2):
Figure PCTCN2022091353-appb-000021
RGCLN18.2抗体的重链氨基酸序列(SEQ ID NO:33)：
Figure PCTCN2022091353-appb-000022
RGCLN18.2抗体的轻链氨基酸序列(SEQ ID NO:34)：
Figure PCTCN2022091353-appb-000023
实施例6抗体药物偶联物(ADC)的制备
抗体药物偶联物(ADC)的制备采用通用的偶联方法：用纯化水分别配制还原剂和保护剂如下：1～20mM TCEP(Tris-2-carboxyethyl-phosphine)、1～20mM DTPA(Diethylene triamine pentacetate acid)母液，还原剂用量根据所需偶联率不同可在一定浓度范围内添加，与一定浓度单克隆抗体(如：5～30mg/mL)按照一定体积比(1:1)混合，TCEP与抗体的终浓度摩尔比0.5～6.0:1，于25℃搅拌反应1h。TCEP还原后的抗体可直接进行偶联。
配制一定浓度(5mM)连接子-活性药物单元化合物溶于25％的DMSO(dimethyl sulfoxide，二甲亚砜)，按照药物与巯基的摩尔比0.3～2.8:1缓慢加药，于25℃搅拌反应1-4h。反应结束后，用PBS缓冲液离心超滤3次，纯化去除残余未反应药物以及DMSO等游离小分子，并且利用SDS-PAGE电泳和疏水高效液相(HIC-HPLC)法检测偶联情况。
本实施例采用的连接子-活性药物单元化合物为MC-Val-Cit-PAB-MMAE、D07-Val-Cit-PAB-MMAE和Py-MAA-Val-Cit-PAB-MMAE，其结构式分别如下所示(合成方法分别参见专利申请CN108853514A(说明书第14页)，CN111433188A(说明书第53页)，WO2019223579A1(说明书第25-27页))。
Figure PCTCN2022091353-appb-000024
利用上述方法制备了如下ADC(p为选自1、2、3、4、5、6、7、8的整数，q为选自1、2、3、4的整数，Ab为本发明提供的RGCLN18.2抗体)，这些ADC的平均DAR为3.5-4.5。
Figure PCTCN2022091353-appb-000025
及
Figure PCTCN2022091353-appb-000026
实施例7抗体药物偶联物的细胞内吞实验
将人胃癌细胞NCI-N87细胞系每孔约1×10 5个细胞重悬于6孔板中。将RGCLN18.2、RGCLN18.2-PY-Val-Cit-PAB-MMAE、RGCLN18.2-MC-Val-Cit-PAB-MMAE、RGCLN18.2-D07-Val-Cit-PAB-MMAE分别与pHAb胺反应性染料缀合， 然后用细胞培养基稀释至10μg/ml。将100μl RGCLN18.2及ADC的染料复合物加入到细胞中，在指示时间(0小时、1小时、3小时、5小时、21小时和24小时)下于37℃温育。通过流式细胞仪测量RGCLN18.2及ADC的内吞效果。结果如图5所示，从内吞实验结果来看，发现RGCLN18.2-PY-Val-Cit-PAB-MMAE、RGCLN18.2-MC-Val-Cit-PAB-MMAE、RGCLN18.2-D07-Val-Cit-PAB-MMAEADC在24h时的内吞率均为98％左右。结果表明RGCLN18.2ADC在人胃癌细胞NCI-N87细胞中有非常好的内吞效果。
实施例8抗体药物偶联物的体外细胞评价
将人胃癌细胞NCI-N87细胞株悬液以100μL/孔、5000个/孔的密度加到96孔板中，置于水饱和的37℃的CO 2培养箱培养过夜。将抗体药物偶联物(RGCLN18.2-PY-Val-Cit-PAB-MMAE、RGCLN18.2-D07-Val-Cit-PAB-MMAE、RGCLN18.2-MC-Val-Cit-PAB-MMAE、IMAB362-MC-Val-Cit-MMAE)浓度进行梯度稀释并加到含有细胞的96孔板中，100μL/孔。继续置于37℃培养箱中培养72小时。酶标仪读取450nm处OD值，抑制率计算公式为：IR％＝(OD空白-OD药物)×100/OD空白。由曲线拟合软件Softmax Pro7.0.3 Gxp计算得IC50值，结果见表7所示。从以上实验数据体外药效试验来看，发现RGCLN18.2-PY-Val-Cit-PAB-MMAE、RGCLN18.2-MC-Val-Cit-PAB-MMAE、RGCLN18.2-D07-Val-Cit-PAB-MMAE ADC的增值抑制效果均优于IMAB362-MC-Val-Cit-MMAE。
表7抗体药物偶联物的体外细胞IC50值、最大抑制率结果
ADC DAR IC50(ng/ml) 抑制率(％)
RGCLN18.2-PY-Val-Cit-PAB-MMAE 4.1 10.51 54.5
RGCLN18.2-D07-Val-Cit-PAB-MMAE 3.84 4.94 54.3
RGCLN18.2-MC-Val-Cit-PAB-MMAE 4.03 6.23 53.08
IMAB362-MC-Val-Cit-PAB-MMAE 4.22 501 52.27
实施例9抗体药物偶联的PDX(人源肿瘤组织来源移植瘤模型)实验
将人胰腺癌组织清洗后切成小块，用套针接种于裸鼠背部右侧肩胛处，待肿瘤生长至100～300mm 3后将动物随机分组，对照组及实验组给 药情况如表8所示。
表8 PDX实验对照组及实验组给药情况
受试药物 死亡动物只数
PBS 给药后第25天死亡一只
IMAB362-MC-Val-Cit-PAB-MMAE 第14、18、53天各死亡一只
RGCLN18.2-MC-Val-Cit-PAB-MMAE 无死亡
实验结果如图6、图7所示，其中图6给出了对照组及实验组动物体重变化曲线，图7给出了对照组及实验组动物荷瘤体积变化曲线，结果显示，RGCLN18.2-MC-Val-Cit-PAB-MMAE在人胰腺癌PDX模型中的抑肿瘤药效强于IMAB362-MC-Val-Cit-PAB-MMAE。
以上描述地仅是优选实施方案，其只作为示例而不限制实施本发明所必需特征的组合。所提供的标题并不意指限制本发明的多种实施方案。术语例如“包含”、“含”和“包括”不意在限制。此外，除非另有说明，没有数词修饰时包括复数形式，以及“或”、“或者”意指“和/或”。除非本文另有定义，本文使用的所有技术和科学术语的意思与本领域技术人员通常理解的相同。
本申请中提及的所有公开物和专利通过引用方式并入本文。不脱离本发明的范围和精神，本发明的所描述的方法和组合物的多种修饰和变体对于本领域技术人员是显而易见的。虽然通过具体的优选实施方式描述了本发明，但是应该理解所要求保护的本发明不应该被不适当地局限于这些具体实施方式。事实上，那些对于相关领域技术人员而言显而易见的用于实施本发明的所描述的模式的多种变体意在包括在随附的权利要求的范围内。

Claims (25)

  1. 一种抗Claudin18.2抗体或其抗原结合片段，所述抗体或其抗原结合片段包括重链可变区和轻链可变区，所述重链可变区的CDR和/或所述轻链可变区的CDR与如下序列限定的抗体具有相同的CDR序列或在如下序列限定的抗体的CDR上进行1-2个氨基酸替换，所述序列限定的抗体为：
    (1)重链可变区氨基酸序列为SEQ ID NO:1所示；和/或
    (2)轻链可变区氨基酸序列为SEQ ID NO:2所示。
  2. 根据权利要求1所述的抗体或其抗原结合片段，其中：
    (1)重链可变区CDR1氨基酸序列如SEQ ID NO:3、4、5、6或7所示或对SEQ ID NO:3、4、5、6或7进行1或2个氨基酸替换后的氨基酸序列；CDR2氨基酸序列如SEQ ID NO:8、9、10、11或12所示或对SEQ ID NO:8、9、10、11或12进行1或2个氨基酸替换后的氨基酸序列；CDR3氨基酸序列如SEQ ID NO:13、14、15、16或17所示或对SEQ ID NO:13、14、15、16或17进行1或2个氨基酸替换后的氨基酸序列；
    (2)轻链可变区CDR1氨基酸序列如SEQ ID NO:18、19、20、21或22所示或对SEQ ID NO:18、19、20、21或22进行1或2个氨基酸替换后的氨基酸序列；CDR2氨基酸序列如SEQ ID NO:23、24、25、26或27所示或对SEQ ID NO:23、24、25、26或27进行1或2个氨基酸替换后的氨基酸序列；CDR3氨基酸序列如SEQ ID NO:28、29、30、31或32所示或对SEQ ID NO:28、29、30、31或32进行1或2个氨基酸替换后的氨基酸序列。
  3. 根据权利要求2所述的抗体或其抗原结合片段，其中，
    (1)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:3、8、13或对SEQ ID NO:3、8、13进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:18、23、28或对SEQ ID NO:18、23、28进行1或2个氨基酸替换后的氨基酸序列；
    (2)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:4、9、14或对SEQ ID NO:4、9、14进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:19、24、29或对SEQ ID NO:19、24、29进行1或2个氨基酸替换后的氨基酸序列；
    (3)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:5、10、15或对SEQ ID NO:5、10、15进行1或2个氨基酸替换后的氨基酸序列；和/或轻链 可变区CDR 1-3氨基酸序列为SEQ ID NO:20、25、30或对SEQ ID NO:20、25、30进行1或2个氨基酸替换后的氨基酸序列；
    (4)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:6、11、16或对SEQ ID NO:6、11、16进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:21、26、31或对SEQ ID NO:21、26、31进行1或2个氨基酸替换后的氨基酸序列；
    (5)重链可变区CDR 1-3氨基酸序列为SEQ ID NO:7、12、17或对SEQ ID NO:7、12、17进行1或2个氨基酸替换后的氨基酸序列；和/或轻链可变区CDR 1-3氨基酸序列为SEQ ID NO:22、27、32或对SEQ ID NO:22、27、32进行1或2个氨基酸替换后的氨基酸序列。
  4. 根据权利要求1-3任一项所述的抗体或其抗原结合片段，其特征在于：
    (1)重链可变区的氨基酸序列如SEQ ID NO:1所示，或与SEQ ID NO:1具有相同的CDR 1-3且与SEQ ID NO:1相比同一性大于80％、85％、90％、95％、96％、97％、98％、99％的序列；和/或
    (2)轻链可变区的氨基酸序列如SEQ ID NO:2所示，或与SEQ ID NO:2具有相同的CDR 1-3且与SEQ ID NO:2相比同一性大于80％、85％、90％、95％、96％、97％、98％、99％的序列。
  5. 根据权利要求4所述的抗体或其抗原结合片段，其中，
    (1)重链的氨基酸序列如SEQ ID NO:33所示；和/或
    (2)轻链的氨基酸序列如SEQ ID NO:34所示。
  6. 根据权利要求1所述的抗体或抗原结合片段，所述的抗体或其功能性结合片段包括单克隆抗体、Fab、Fab'、Fab'-SH、F(ab')2、Fv、单链Fv(scFv)、双特异性抗体、多特异性抗体、嵌合抗体、人源化抗体或包含抗体的抗原结合部分的融合蛋白；优选的，所述的抗体为人源化单克隆抗体。
  7. 根据权利要求1-6任一项所述的抗体或其抗原结合片段，其进一步包括人或鼠恒定区；优选的，所述恒定区选自IgG1、IgG2、IgG3、IgG4。
  8. 一种抗体药物偶联物，其含有权利要求1-7任一项所述的抗体或其抗原结合片段。
  9. 根据权利要求8所述的抗体药物偶联物，其特征在于，所述的抗体 药物偶联物结构如式(I)所示：
    Ab-L–D  (I)
    其中：
    Ab为权利要求1-7任一项所述的抗体或其抗原结合片段；
    D为活性药物单元；
    L为任一连接基团，其分别与抗体或其抗原结合片段Ab及活性药物单元D共价连接；
    其中，所述Ab上通过一个或多个连接基团L连接一个或多个活性药物单元D。
  10. 根据权利要求9所述的抗体药物偶联物，其特征在于，所述L与所述Ab上氨基残基或巯基残基共价连接；优选的，所述L与所述Ab上的巯基残基共价连接；更优选的，所述L与所述Ab上的链间二硫健打开后形成的巯基残基共价连接。
  11. 根据权利要求9所述的抗体药物偶联物，其特征在于，所述L包括可裂解连接子和不可裂解连接子。
  12. 根据权利要求11所述的抗体药物偶联物，其特征在于：所述的可裂解连接子包括肽单元，所述的肽单元包含2-20个氨基酸，优选的所述的肽单元选自由-缬氨酸-瓜氨酸-(-Val-Cit-)、-甘氨酸-甘氨酸-苯丙氨酸-甘氨酸-(-Gly-Gly-Phe-Gly-)、-缬氨酸-丙氨酸-(-Val-Ala-)、-缬氨酸-赖氨酸-(-Val-Lys-)、-缬氨酸-精氨酸-(-Val-Arg-)、-苯丙氨酸-瓜氨酸-(-Phe-Cit-)、-苯丙氨酸-赖氨酸-(-Phe-Lys-)、-苯丙氨酸-精氨酸-(-Phe-Arg-)及它们的组合。
  13. 根据权利要求9-12任一项所述的抗体药物偶联物，其特征在于，所述的L包括以下结构：
    Figure PCTCN2022091353-appb-100001
    Figure PCTCN2022091353-appb-100002
    Figure PCTCN2022091353-appb-100003
    Figure PCTCN2022091353-appb-100004
  14. 根据权利要求9所述的抗体药物偶联物，其特征在于，所述的活性药物单元D为细胞毒分子、细胞分化因子、干细胞营养因子、类固醇类药物、治疗自身免疫疾病的药物、抗炎症药物或治疗传染性疾病的药物；优选的，所述细胞毒分子包括但不限于微管蛋白抑制剂或DNA损伤 剂，所述微管蛋白抑制剂包括但不限于海兔毒素(dolastatin)及奥瑞他汀(auristatin)类细胞毒分子，美登素(maytansine)类细胞毒分子；所述DNA损伤剂包括但不限于卡奇霉素类(calicheamicin)、倍癌霉素(duocarmycin)类、安曲霉素类衍生物PBD、喜树碱(camptothecins)及喜树碱类衍生物、SN-38；更优选的，所述奥瑞他汀(auristatin)类细胞素分子包括但不限于MMAE或MMAF或它们的衍生物，所述美登素类细胞毒分子包括但不限于DM1、DM4或它们的衍生物。
  15. 根据权利要求9所述的抗体药物偶联物，其特征在于，所述的活性药物单元D选自以下结构：
    Figure PCTCN2022091353-appb-100005
    Figure PCTCN2022091353-appb-100006
  16. 根据权利要求9所述的抗体药物偶联物，其特征在于，所述抗体药物偶联物结构如下所示：
    Figure PCTCN2022091353-appb-100007
    其中，p为选自1、2、3、4、5、6、7、8的整数，q为选自1、2、3、4的整数。
  17. 分离的多核苷酸或其组合，其编码权利要求1-7中任一项所述的抗体或其抗原结合片段。
  18. 一种核酸构建体，其包含权利要求17的多核苷酸。
  19. 权利要求18所述的核酸构建体，所述核酸构建体为载体。
  20. 一种宿主细胞，其包含权利要求18或19中的核酸构建体。
  21. 权利要求20所述的宿主细胞，所述细胞是原核细胞、真核细胞、酵母细胞、哺乳动物细胞、大肠杆菌细胞或CHO细胞、NS0细胞、Sp2/0细胞、BHK细胞。
  22. 药物组合物，包含权利要求1-7中任一项所述的抗体或其抗原结合片段和/或权利要求8或15的抗体药物偶联物，以及药学上可接受的载体。
  23. 制备抗Claudin18.2抗体的方法，其包括在适合表达编码抗Claudin18.2抗体或抗原结合片段的载体的条件下培养权利要求20或21所述的宿主细胞，并且回收所述抗体或片段。
  24. 权利要求1-7中任一项所述的抗体或其抗原结合片段、权利要求8-15所述的抗体药物偶联物、权利要求17的多核苷酸或其组合、权利要求18的核酸构建体、权利要求19的载体、或权利要求22的药物组合物在制备用于治疗或预防癌症的药物中的用途。
  25. 权利要求24所述的用途，其中所述癌症为实体瘤；进一步的，所述实体瘤包括胃癌、胰腺癌。
PCT/CN2022/091353 2021-05-08 2022-05-07 一种抗Claudin18.2抗体及其抗体药物偶联物 Ceased WO2022237666A1 (zh)

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