WO2018203517A1 - プラスミンにより切断可能な抗不溶性フィブリン抗体と薬物とのコンジュゲート - Google Patents
プラスミンにより切断可能な抗不溶性フィブリン抗体と薬物とのコンジュゲート Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/22—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against growth factors ; against growth regulators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—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
- 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
- A61K47/6801—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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—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
- 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
- A61K47/6835—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
- A61K47/6843—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 material from animals or humans
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—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
- 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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/36—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against blood coagulation factors
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/565—Complementarity determining region [CDR]
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
Definitions
- the present invention relates to an antibody drug conjugate and a composition containing the conjugate for use in treating cancer.
- Insoluble fibrin does not exist in tissues under normal physiological conditions, unlike the precursor fibrinogen widely recognized in the living body.
- the thrombin that has leaked out of the blood vessel and activated cleaves fibrinogen to form a fibrin monomer, and the fibrin monomer is polymerized and crosslinked to form fibrin fibers. Therefore, insoluble fibrin is specific to tissues in a pathological state such as bleeding and inflammation, and is formed when a pathological condition accompanied by coagulation such as cancer, myocardial infarction, and cerebral infarction occurs.
- insoluble fibrin is a marker molecule for such thrombosis-related diseases
- insoluble fibrin present in cancer tissues in the absence of cerebral circulatory diseases such as myocardial infarction and cerebral infarction is just a cancer-specific molecule.
- Patent Document 1 an antibody specific to insoluble fibrin and an antibody drug conjugate (ADC) using the antibody have been proposed.
- the present inventors have developed an ADC of an antibody and a drug specific for insoluble fibrin, wherein the linker connecting the antibody and the drug has a plasmin cleavage sequence.
- the inventors have found that the resulting ADC is delivered to insoluble fibrin and that it is cleaved by plasmin at the point of delivery to release the drug in situ.
- the present inventors can use a tumor model animal to target the location where the obtained ADC accumulates insoluble fibrin around the tumor and release the drug on the spot, thereby anticancer against tumors. It has been found that it works.
- the present inventors acquired a new insoluble fibrin-specific antibody. The present invention is based on these findings.
- an antibody-drug conjugate The antibody is an antibody that binds to fibrin and has a higher affinity for insoluble fibrin than that for fibrinogen,
- the drug is a cytotoxic agent
- An ADC in which an antibody and a drug are linked by a linker having a plasmin cleavage site so that the antibody and the drug can be cleaved by plasmin.
- the ADC according to (1) above The ADC, wherein the linker has a valine-leucine-lysine peptide sequence as a plasmin cleavage site.
- a pharmaceutical composition for treating cancer comprising the ADC according to (1) or (2) above.
- an antibody that binds to fibrin An antibody, or an antigen-binding fragment thereof, comprising a heavy chain variable region represented by SEQ ID NO: 4 and a light chain variable region represented by SEQ ID NO: 8.
- an antibody that binds to fibrin A heavy chain variable region comprising CDR1 set forth in SEQ ID NO: 9, CDR2 set forth in SEQ ID NO: 10, and CDR3 set forth in SEQ ID NO: 11, A light chain variable region comprising CDR1 set forth in SEQ ID NO: 13, CDR2 set forth in SEQ ID NO: 14, and CDR3 set forth in SEQ ID NO: 15; Or an antibody that competes with the antibody for binding to fibrin; or an antigen-binding fragment thereof.
- an antibody that binds to fibrin An antibody, or an antigen-binding fragment thereof, having a heavy chain variable region shown in SEQ ID NO: 12 and a light chain variable region shown in SEQ ID NO: 16.
- a pharmaceutical composition comprising the ADC according to (9) above.
- FIG. 1 shows that the antibody obtained in the present invention is an insoluble fibrin-specific antibody.
- FIG. 2 shows that the insoluble fibrin-specific monoclonal antibody obtained in the present invention accumulates in the tumor formation part.
- FIG. 3 shows in particular the drug moiety and linker moiety of the antibody drug conjugates made in the present invention.
- FIG. 4 shows the in vitro anticancer activity verification results using the antibody drug conjugate prepared in the present invention.
- FIG. 5 shows Kaplan-Meier curves of antibody drug conjugates generated in the present invention against a spontaneous model of pancreatic cancer.
- FIG. 6A shows the inhibitory effect of antibody drug conjugates made in the present invention on the increase in tumor volume in tumor subcutaneously transplanted mice.
- FIG. 6A shows the inhibitory effect of antibody drug conjugates made in the present invention on the increase in tumor volume in tumor subcutaneously transplanted mice.
- FIG. 6B shows the change over time in the body weight of the mice observed in FIG. 6A.
- FIG. 7 shows the cell growth inhibitory action of an ADC having a plasmin linker having a plasmin cleavage site and a cathepsin linker having a cathepsin cleavage site instead of a plasmin cleavage site.
- FIG. 8 shows the putative mechanism of action of the antibody drug conjugates made in the present invention.
- subject means a mammal, and may be a human in particular.
- treatment is used to mean treatment (therapeutic treatment) and prevention (preventive treatment).
- treatment means treatment, cure, prevention or amelioration of a disease or disorder or a reduction in the rate of progression of a disease or disorder.
- prevention means reducing the likelihood of the onset of a disease or condition or delaying the onset of a disease or condition.
- disease means a symptom for which treatment is beneficial.
- cancer means a malignant tumor.
- antibody means an immunoglobulin and includes a polyclonal antibody and a monoclonal antibody.
- a preferred antibody is a monoclonal antibody.
- the origin of the antibody is not particularly limited, and examples thereof include a non-human animal antibody, a non-human mammal antibody, and a human antibody.
- the antibody may also be a chimeric antibody, a humanized antibody, or a human antibody.
- the antibody may also be a bispecific antibody.
- therapeutically effective amount means the amount of a drug effective for treating (preventing or treating) a disease or condition.
- a therapeutically effective amount of a drug reduces the rate of worsening of a symptom of a disease or condition, stops the worsening of the symptom, improves the symptom, cures the symptom, or develops or develops the symptom Can be suppressed.
- insoluble fibrin means fibrin crosslinked by Factor XIII.
- fibrinogen is converted into fibrin monomer by the action of thrombin, and the fibrinogen monomer is polymerized to form a hardly soluble fibrin polymer.
- Fibrin polymer is cross-linked by factor XIII to become insoluble fibrin.
- insoluble fibrin-specific antibody refers to an antibody that binds to insoluble fibrin and has a higher affinity for insoluble fibrin than for fibrinogen. Such an insoluble fibrin-specific antibody can be easily obtained by screening with affinity for insoluble fibrin and affinity for fibrinogen. Fibrin has an epitope site that is exposed only when it becomes insoluble and undergoes conformational transformation in insoluble fibrin. Therefore, an “insoluble fibrin-specific antibody” can be obtained by immunization using this exposed domain, that is, the D domain (hereinafter also referred to as “D-domain”) as an immunogen. It can also be obtained using linear peptides.
- Insoluble fibrin-specific antibodies when immunizing a partial peptide of fibrin B ⁇ chain corresponding to positions 231 to 246 of the amino acid sequence of fibrin B ⁇ chain (for example, human fibrin B ⁇ chain may have the amino acid sequence represented by SEQ ID NO: 25), “Insoluble fibrin-specific antibodies "can be obtained.
- insoluble fibrin-specific antibody can also be obtained by immunization using the peptide of SEQ ID NO: 26 or SEQ ID NO: 27 as an immunogen.
- Such insoluble fibrin-specific antibodies can be antibodies that have a higher affinity for insoluble fibrin than for any of fibrinogen, fibrin monomer and fibrin polymer.
- An antibody having an affinity ratio for insoluble fibrin and affinity for fibrinogen exceeding 1, for example, 1.5 or more, 2 or more, 3 or more, 4 or more, or 5 or more can be obtained as an insoluble fibrin-specific antibody.
- Affinity means binding affinity (KD) and can be determined by a known method such as ELISA or binding equilibrium exclusion.
- “competing” means competing with another binding antibody for binding to an antigen. Competition can occur when the binding sites of two antibodies for an antigen overlap. Such antibodies can be obtained by immunization with epitopes as described above, and / or by confirming whether binding of one antibody to an antigen is reduced by the other antibody by a competition assay. Obtainable.
- antibody-drug conjugate means a substance in which an antibody and a cytotoxic agent are linked.
- the antibody and cytotoxic agent can be linked via an appropriate linker.
- a chemotherapeutic agent, a radioisotope, and a toxin can be used.
- the ADC also includes a conjugate of an antigen-binding fragment of an antibody and a drug.
- the term “antigen-binding fragment” means a part of an antibody that maintains the binding to an antigen.
- the antigen-binding fragment can comprise the heavy chain variable region or the light chain variable region of the antibody of the present invention, or both.
- the antigen-binding fragment may be chimerized or humanized.
- Examples of the antigen-binding fragment include Fab, Fab ′, F (ab ′) 2 , Fv, scFv (single chain Fv), diabody, and sc (Fv) 2 (single chain (Fv) 2 ).
- Such antibody fragments are not particularly limited, and can be obtained, for example, by treating an antibody with an enzyme.
- Fab can be obtained by digesting an antibody with papain.
- F (ab ′) 2 can be obtained by digesting the antibody with pepsin
- Fab ′ can be obtained by further reducing this.
- such an antigen-binding fragment of an antibody can be used.
- the antibody and cytotoxic agent in the antibody-drug conjugate are linked via a linker.
- cytotoxic agents include chemotherapeutic agents (for example, anticancer agents such as commercially available anticancer agents such as auristatin (auristatin E, auristatin F phenylenediamine (AFP), monomethyl auristatin E, monomethyl auri).
- chemotherapeutic agents for example, anticancer agents such as commercially available anticancer agents such as auristatin (auristatin E, auristatin F phenylenediamine (AFP), monomethyl auristatin E, monomethyl auri).
- Statins F and their derivatives maytansinoids DM1 and DM4 and their derivatives), camptothecin (SN-38, irinotecan, roottecan, DB67, BMP1350, ST1481, CKD602, topotecan and exatecan, and their derivatives), DNA minor Groove binders (endiin, lexitropsin, duocarmycin and their derivatives), taxanes (paclitaxel and docetaxel and their derivatives), polyketides (discodermolide and their derivatives), anthraquinones (mi Xanthrone and its derivatives), benzodiazepines (pyrrolobenzodiazepine, indolinobenzodiazepine, and oxazolidinobenzodiazepines and their derivatives), vinca alkaloids (vincristine, vinblastine, vindesine, and vinorelbine and their derivatives), doxorubicins (doxorubicin, morpholino- Doxorubi
- cytotoxic agent in the ADC of the present invention for example, camptothecin, particularly SN-38, or exatecan can be used.
- cytotoxic agent any of those used for the treatment of cancer can be used.
- a pharmaceutically acceptable salt, solvate (for example, hydrate), ester, or prodrug of the above cytotoxic agent may be used.
- the linker of the ADC contains a plasmin cleavage sequence and can be cleaved in the presence of plasmin.
- the ADC linker consists of a stable chemical bond in the process other than the plasmin cleavage sequence until it is delivered to insoluble fibrin after administration. With such a configuration, the ADC of the present invention is stable until it is delivered to insoluble fibrin after administration, and is cleaved by plasmin after binding to insoluble fibrin and releases the cytotoxic agent only in the vicinity of insoluble fibrin. Will be.
- the plasmin cleavage sequence is an amino acid sequence, specifically valine-leucine-lysine, glycine-proline-lysine, glutamic acid-lysine-lysine, lysine-phenylalanine-lysine, norvaline-chlorohexylalanyl-lysine, and norleucine -A peptide chain comprising an amino acid sequence such as a plasmin cleavage sequence selected from the group consisting of hexahydrotyrosine-lysine.
- a linker can be appropriately selected and synthesized by those skilled in the art in the production of ADC.
- the linker may have a first spacer introduced between the antibody and the plasmin cleavage sequence, for example, polyethylene glycol (PEG), for example, about 5 to 40 repeating units per molecule. PEG can be used as the first spacer.
- a second spacer may be introduced between the plasmin cleavage sequence and the cytotoxic agent.
- PABC p-aminobenzyloxycarbonyl
- the linker comprises a first spacer and a plasmin cleavage sequence.
- the linker comprises a first spacer, a plasmin cleavage sequence, and a second spacer.
- the linker comprises PEG, a plasmin cleavage sequence, and PABC. In some embodiments, the linker does not include a cleavable moiety other than a plasmin cleavage sequence.
- the bond between the antibody and the linker can be linked to, for example, a sulfhydryl group of the antibody via a maleimide group.
- the antibody is linked to an anticancer agent through its sulfhydryl group with a linker having a maleimide-PEG-plasmin cleavage sequence.
- the antibody is linked to an anticancer agent through its sulfhydryl group with a linker having a maleimide-PEG-plasmin cleavage sequence-PABC.
- the anticancer agent is linked to the anticancer agent by a linker having a plasmin cleavage site that can be cleaved by plasmin, and the ADC reaches a location where insoluble fibrin has accumulated. Then, the linker is cleaved at the plasmin cleavage site by plasmin present around the plasmin, and an anticancer agent is released around the insoluble fibrin.
- insoluble fibrin has accumulated based on bleeding due to cancer infiltration around the cancer tissue (see FIG. 8), and the antibody of the present invention (that is, the insoluble fibrin-specific antibody). ) Is useful for targeting cancer in drug delivery systems, and the ADC of the present invention is considered useful as a therapeutic agent for cancer.
- an antibody that binds to fibrin A heavy chain variable region comprising CDR1 set forth in SEQ ID NO: 1, CDR2 set forth in SEQ ID NO: 2 and CDR3 set forth in SEQ ID NO: 3; A light chain variable region comprising CDR1 set forth in SEQ ID NO: 5, CDR2 set forth in SEQ ID NO: 6, and CDR3 set forth in SEQ ID NO: 7; And an antibody that competes with the antibody for binding to fibrin.
- These antibodies can be used as insoluble fibrin specific antibodies.
- the present invention also provides the following antibodies: An antibody that binds to fibrin, An antibody having a heavy chain variable region shown in SEQ ID NO: 4 and a light chain variable region shown in SEQ ID NO: 8.
- This antibody can be used as an insoluble fibrin-specific antibody.
- This antibody A heavy chain variable region comprising CDR1 set forth in SEQ ID NO: 1, CDR2 set forth in SEQ ID NO: 2 and CDR3 set forth in SEQ ID NO: 3; A light chain variable region comprising CDR1 set forth in SEQ ID NO: 5, CDR2 set forth in SEQ ID NO: 6, and CDR3 set forth in SEQ ID NO: 7; It can also be said that it has an antibody.
- an antibody that binds to fibrin A heavy chain variable region comprising CDR1 set forth in SEQ ID NO: 9, CDR2 set forth in SEQ ID NO: 10, and CDR3 set forth in SEQ ID NO: 11, A light chain variable region comprising CDR1 set forth in SEQ ID NO: 13, CDR2 set forth in SEQ ID NO: 14, and CDR3 set forth in SEQ ID NO: 15; And an antibody that competes with the antibody for binding to fibrin.
- These antibodies can be used as insoluble fibrin specific antibodies.
- the present invention also provides the following antibodies: An antibody that binds to fibrin, An antibody having a heavy chain variable region shown in SEQ ID NO: 12 and a light chain variable region shown in SEQ ID NO: 16.
- This antibody can be used as an insoluble fibrin-specific antibody.
- This antibody A heavy chain variable region comprising CDR1 set forth in SEQ ID NO: 9, CDR2 set forth in SEQ ID NO: 10, and CDR3 set forth in SEQ ID NO: 11, A light chain variable region comprising CDR1 set forth in SEQ ID NO: 13, CDR2 set forth in SEQ ID NO: 14, and CDR3 set forth in SEQ ID NO: 15; It can also be said that it has an antibody.
- insoluble fibrin-specific antibodies, and antigen-binding fragments thereof can be used as antibody portions in the ADC of the present invention.
- a pharmaceutical composition comprising a therapeutically effective amount of the above ADC (also referred to as “ADC of the present invention”).
- ADC of the present invention a pharmaceutical composition comprising a therapeutically effective amount of the above ADC
- the ADC of the present invention and the pharmaceutical composition can each be used for treating cancer.
- the cancer to be treated by the ADC or pharmaceutical composition of the present invention is not particularly limited, but cancer, for example, lung cancer, pancreatic cancer, head and neck cancer, prostate cancer, bladder cancer, breast cancer, esophagus. Cancer, stomach cancer, colon cancer, uterine cancer, ovarian cancer, skin cancer, thyroid cancer, thymic cancer, kidney cancer, testicular cancer, penile cancer, liver cancer, biliary tract cancer, brain tumor Bone and soft tissue tumors, retroperitoneal tumors, angio-lymphatic sarcomas, and these metastatic cancers.
- lung cancer pancreatic cancer, head and neck cancer
- prostate cancer bladder cancer
- breast cancer esophagus
- Cancer stomach cancer, colon cancer, uterine cancer, ovarian cancer, skin cancer, thyroid cancer, thymic cancer, kidney cancer, testicular cancer, penile cancer, liver cancer, biliary tract cancer, brain tumor Bone and soft tissue tumors, retroperitoneal tumors, angio-lymphatic sarcom
- the subject of the present invention may be a subject not suffering from a thrombotic disorder or a disease with a thrombotic disorder, or a subject that has not been diagnosed as having a thrombotic disorder or a disease with a thrombotic disorder. This can be expected to reduce side effects in tissues other than cancer. Therefore, determine whether the subject with cancer is suffering from a thrombotic disorder or a disease with thrombotic disorder, and then to a subject not suffering from a thrombotic disorder or a disease with thrombotic disorder
- the ADC of the present invention may be administered. Whether or not the patient is suffering from a thrombotic disorder or a disease accompanied by a thrombotic disorder can be appropriately determined by a doctor.
- the pharmaceutical composition comprises the ADC of the present invention and an excipient.
- the pharmaceutical composition of the present invention can be administered by administration methods such as intravenous administration, subcutaneous administration, intratumoral administration, intraperitoneal administration, intraventricular administration, and intramuscular administration.
- the dose can be appropriately determined by a doctor in consideration of the patient's age, sex, weight, disease severity, and the like.
- the ADC of the present invention targets insoluble fibrin that accumulates in the stroma of these cancers and accumulates cytotoxic agents at the target site, but is not only activated at the site where insoluble fibrin is present.
- a plasmin-cleavable linker that releases the cytotoxic agent at the targeting site.
- an insoluble fibrin-specific antibody in the manufacture of a medicament for use in treating cancer.
- an ADC of an insoluble fibrin-specific antibody and a cytotoxic agent in the manufacture of a medicament for use in treating cancer, an ADC of an insoluble fibrin-specific antibody and a cytotoxic agent, wherein the antibody and the cytotoxic agent are capable of plasmin cleavage.
- the use of an ADC is provided.
- a method of treating cancer in a subject in need thereof comprising administering to said subject a therapeutically effective amount of an ADC of the present invention.
- a method for treating cancer in a subject in need thereof comprising determining whether a subject having cancer suffers from a thrombotic disorder or a disease with a thrombotic disorder,
- a method comprising administering a therapeutically effective amount of an ADC of the invention to a subject not suffering from a thrombotic disorder or a disease associated with a thrombotic disorder.
- Example 1 Production of Insoluble Fibrin Specific Antibody
- an antibody having a selectively higher affinity for insoluble fibrin than for fibrinogen hereinafter referred to as “insoluble fibrin specific antibody”.
- an antibody was obtained by immunizing an animal with the peptide having the amino acid sequence of SEQ ID NO: 26 and the peptide having the amino acid sequence of SEQ ID NO: 27 as an immunogen.
- mice were immunized 6 times every 2 weeks.
- the first and fourth immunization preparations were as follows.
- a peptide having the amino acid sequence of SEQ ID NO: 26 and a peptide having the amino acid sequence of SEQ ID NO: 27 were used as immunogens, respectively.
- An immunogen adjusted to 0.5 mg / ml with sterile PBS was prepared and placed in a 1 ml syringe.
- Freund's Complete Adjuvant (Difco) equal in volume to the immunogen was placed in separate 1 ml syringes, and each syringe was connected with an adapter and pushed out together until resistance was felt.
- the immunogen preparations for the second, third, fifth and sixth immunizations were as follows. An immunogen adjusted to 0.5 mg / ml with sterilized PBS was prepared, and GERBU ADJUVANT 100 (Nacalai Tesque) equivalent to the immunogen was mixed in a 1.5 ml tube and placed in a 1 ml syringe. In the second, third, fifth and sixth immunizations, 100 ⁇ l of the immunogen was administered intraperitoneally. For final immunization, an immunogen adjusted to 0.1 mg / ml with sterilized PBS was prepared and placed in a 1 ml syringe. The immunogen was first administered to the peritoneal cavity at 100 ⁇ l, and 10 minutes later, 400 ⁇ l was administered to the tail vein.
- the mouse collected blood from the tail vein one week before the final immunization. The sample was centrifuged at 4,000 ⁇ g for 10 minutes at 4 ° C., and the supernatant was collected and used as a sample. The antibody titer was measured by ELISA using samples diluted stepwise from 100-fold dilution to 12800-fold dilution. Prior to ELISA, an antigen-immobilized plate was prepared in advance. Fibrinogen from human plasma (SIGMA) was dissolved in TBS (pH 8.5) to prepare a 20 ⁇ g / ml fibrinogen solution.
- SIGMA Fibrinogen from human plasma
- a fibrinogen plate was added to a 96-well immunoplate at 50 ⁇ l / well and allowed to stand overnight at 4 ° C.
- Thrombin diluted to 0.05 NIH U / ml with thrombin dilution [7 mM L-Cystein (Wako), 1 mM CaCl 2 (Wako), TBS (pH 8.5)] was added to this fibrinogen plate at 100 ⁇ l per well.
- the fibrin plate was added and incubated at 37 ° C for 2 hours.
- the plate on which each antigen was immobilized was washed 3 times with 200 ⁇ l of PBS-T (PBS, 0.5% (v / v) Tween20), and 200 ⁇ L of blocking solution [PBS-T, 1% (w / v) BSA] was added, and the mixture was allowed to stand at room temperature for 1 hour for blocking. 50 ⁇ l / well of serially diluted samples were added and allowed to stand at room temperature for 1 hour. The solution was discarded, washed 3 times with PBS-T, 50 ⁇ l of secondary antibody diluted to 0.3 ⁇ g / ml with blocking solution was added to each well and allowed to stand at room temperature for 30 minutes.
- spleen was surgically removed from the mouse and immersed in a medium supplemented with RPMI 1640 with 200 units / ml Penicillin-200 ⁇ g / ml Streptomycin-500 ng / ml Amphotericin B.
- RPMI1640 was injected into the spleen using a syringe 10 ml (TERUMO) and an injection needle 22G (TERUMO), spleen cells were taken out, and passed through an EASY strainer 70 ⁇ m mesh (greiner).
- the collected cell suspension was centrifuged at 270 ⁇ g, 5 min, room temperature, the supernatant was removed, and then suspended in 10 ml of RPMI 1640. This washing with RPMI 1640 was repeated twice, suspended in 5 ml of RPMI 1640, and cell fusion was performed like cell fusion using mouse iliac lymph nodes.
- the third screening 50 ⁇ l of the culture supernatant was dispensed from the well inoculated with the colony and used as the primary antibody.
- ELISA was performed using a fibrin plate and a fibrinogen plate in the same manner as the antibody titer measurement.
- the well cells that were positive in the third screening were subjected to limiting dilution.
- 50 ⁇ l of the culture supernatant was dispensed from only a single cell well and used as the primary antibody.
- ELISA was performed using a fibrin plate and a fibrinogen plate in the same manner as the antibody titer measurement. As a result, cells producing an insoluble fibrin-specific antibody were selected.
- 99-5 clones were obtained from mice immunized with the peptide having the amino acid sequence of SEQ ID NO: 26.
- 1101 clones were obtained from mice immunized with the peptide having the amino acid sequence of SEQ ID NO: 27.
- this “99-5 clone” may be simply referred to as “99 clone”.
- Example 2 Characterization of the obtained monoclonal antibody
- the affinity of the antibody was verified by ELISA and surface plasmon resonance (SPR).
- the fibrin plate was incubated for 2 hours at 37 ° C.
- the plate on which each antigen was immobilized was washed 3 times with 200 ⁇ l of PBS-T (PBS, 0.5% (v / v) Tween20), and 200 ⁇ L of blocking solution [PBS-T, 1% (w / v) BSA] was added, and the mixture was allowed to stand at room temperature for 1 hour for blocking.
- Samples serially diluted with PBS were added at 50 ⁇ l / well and allowed to stand at room temperature for 1 hour.
- the solution was discarded, washed 3 times with PBS-T, 50 ⁇ l of secondary antibody diluted to 0.3 ⁇ g / ml with blocking solution was added to each well and allowed to stand at room temperature for 30 minutes.
- secondary antibody Polyclonal Rabbit Anti-Mouse Immunoglobulins / HRP (Dako) and Polyclonal Rabbit Anti-Rat Immunoglobulins / HRP (Dako) were used depending on the sample.
- the solution was discarded and washed 3 times with PBS-T, and 100 ⁇ l of the chromogenic substrate solution was added to each well and allowed to react at room temperature for 10 minutes. 30 ⁇ l of 2N H2SO4 was added to each well to stop the reaction. Absorbance at a wavelength of 450 nm was measured with Spectra Max paradigm (Molecular Devices).
- the antibodies obtained from the 99 and 1101 clones newly obtained in the above example were insoluble fibrin-specific antibodies that bind to insoluble fibrin more strongly than to fibrinogen. . Moreover, it reacted more strongly to fibrin than the antibody obtained from the 102-10 clone obtained in WO2016 / 167227.
- Example 3 Verification of antibody accumulation in a pancreas cancer subcutaneous transplant model
- LSL-Kras G12D / + provided by Y. Kawaguchi, C. Wright, D. Tuveson P53, p48, and K-Ras triple mutant mice (pancreatic cancer model mice) were created by combining LSL-Trp53 R172H / + from Ptf1a-Cre and National Cancer Institute at Frederick. Since we were able to establish a pancreatic cancer cell line derived from it, we performed in vivo imaging using that cell line. This triple mutant mouse has been reported to mimic the development of human pancreatic cancer.
- Pancreatic cancer cell line is 100 ml Fetal Bovine Serum (FBS, gibco) deactivated in 500 ml RPMI 1640 (Wako) and 10 ml 100 units / ml Penicillin- 100 ⁇ g / ml Streptomycin -250 ng / ml The cells were cultured in a medium supplemented with Amphotericin B (Wako).
- the culture supernatant was removed, washed with PBS (Invitrogen), and 2 ml of Trypsin-EDTA [0.25% (w / v) Trypsin-1.0 mmol / l thylenediaminetetraacetic acid 4Na Solution with Phenol Red, Japanese Kosei Pharmaceutical Co., Ltd.] was added, the cells were peeled off by pipetting, and placed in a 15 ml tube (corning). Centrifugation was performed using a centrifuge (Universal Centrifuge 5800, KUBOTA) under the conditions of 270 ⁇ g, 3 min, 4 ° C., and the supernatant was removed.
- a centrifuge Universal Centrifuge 5800, KUBOTA
- the suspension was resuspended in 10 ml of PBS and centrifuged at 270 ⁇ g, 3 min, 4 ° C. Repeat this 3 times, adjust to 2 ⁇ 10 6 cells / 50 ⁇ l with PBS, and inject 50 ⁇ l per mouse into the base of the left foot of 5-week-old BALB / c Slc nu / nu mice (Japan SLC) did.
- Alexa647-labeled anti-insoluble fibrin antibody and control antibody were administered at 300 ⁇ g tail vein per mouse.
- InVivoMAb Mouse IgG1 Isotype control BioXCell was used for control.
- images were taken with an in vivo biological observation system OV110 (olympus) on the 1st, 3rd, 5th and 7th days.
- the surgically removed tumor was embedded in OCT®compound® (Sakura Finetech Japan Co., Ltd.) and frozen to prepare a 6 ⁇ m thin section. After air drying with a dryer for 45 minutes, it was fixed with cold acetone bottle (Wako) for 10 minutes. After washing with PBS, nuclear staining was performed with Mayer's hematoxylin (Muto Chemical Co., Ltd.) for 2 minutes. After washing with running water for 10 minutes, the cytoplasm was stained with an eosin alcohol bottle (Muto Chemical Co., Ltd.) diluted 3-fold with 100% ethanol.
- the surgically removed tumor was embedded in OCT®compound® (Sakura Finetech Japan Co., Ltd.) and frozen to prepare a 6 ⁇ m thin section. After air drying with a dryer for 45 minutes, it was fixed with cold acetone bottle (Wako) for 10 minutes. After washing with PBS, the cells were immersed in 0.3% (v / v) H2O2 for 20 minutes to inhibit endogenous peroxidase. After washing with PBS three times for 5 minutes, blocking was performed with blocking solution [5% (w / v) skim milk (Difco), PBS] for 30 minutes.
- Example 4 In vitro anticancer activity
- ADC antibody drug conjugate in which monomethylauristatin E (MMAE) was linked to the obtained insoluble fibrin-specific antibody was prepared, and its anticancer activity was produced. Verified.
- an ADC having the structure shown in FIG. 3 was synthesized and used.
- This ADC is obtained by linking MMAE to a monoclonal antibody (mAb) as an anticancer agent.
- mAb monoclonal antibody
- the antibody and MMAE are linked via a polyethylene glycol (PEG) spacer and a plasmin cleavage site, Val-Leu-Lys, and cleaved in the presence of plasmin, and MMAE is released from the antibody. Is done.
- the ADC was synthesized as follows. DIPEA (0.54 mL, 3.10 mmol) and p-nitrophenyl chloroformate (472 mg, 1.55 mmol) were added to a DMF (2 mL) solution of Fmoc-Val-Leu-Lys (Mmt) -aminobenzylalcohol (0.74 g, 0.773 mmol) at 0 degrees. And stirred at room temperature for 12 hours. The reaction was quenched with saturated aqueous ammonium chloride and extracted with chloroform. The extract layer was washed with saturated brine, dried over Na 2 SO 4 and concentrated under reduced pressure.
- MMAE (14.1 mg, 0.0197 mmol) was added to a solution of p-nitrophenyl carbonate (33.2 mg, 0.0296 mmol), HOBt (0.5 mg, 0.0039 mmol) in pyridine (80 mL)-DMF (0.4 mL) at 0 degrees. It was. After stirring the reaction solution at room temperature for 10 hours, the reaction solution was directly purified by LH20 (chloroform / methanol 1/1), and Fmoc-Val-Leu-Lys (Mmt) -OPABC-MMAE (22.7 mg, 68%) was added. Obtained as a colorless amorphous. MS (MALDI-TOFMS) calcd for [C 99 H 132 N 10 O 15 + K] + 1739.95; found 1741.37.
- HIPAL-Leu-Lys (Mmt)-OPABC-MMAE (458 mg, 0.309 mmol) in methylene chloride solution (2 mL) and DIPEA (160 mL, 0.927 mmol) and Mal-PEG 12 -OSu (295 mg, 0.340 mmol) in methylene chloride (1 mL) was added at 0 ° C.
- a fibrin plate was produced. 5 ⁇ L of a 25 mg / ml fibrinogen solution was added to the wall surface of a 96-well plate for cell culture. 1 ⁇ l of thrombin solution was added to each well, and the mixture was centrifuged for 1 minute at 40 ° ⁇ g and 4 ° C. The reaction was carried out at 37 ° C. for 2 hours and then stored at 4 ° C. until use.
- 5-11 cell line (TG mouse-derived pancreatic cancer cells) was seeded on fibrin-coated plates obtained at 2000 cells / well and cultured overnight at 37 ° C.
- the culture solution was RPMI medium containing 10% FBS.
- the dilution series was adjusted so that the final concentration of ADC was 0 to 25 nM (MMAE conversion).
- the final concentrations of plasminogen, tPA, and ⁇ 2-antiplasmin were adjusted to the same levels as in normal plasma, that is, about 1500 nM, about 0.3 nM, and about 1000 nM, respectively.
- the culture solution was removed from the fibrin plate, 90 ⁇ l of the above solution containing plasminogen, tPA, ⁇ 2-antiplasmin was added, and then 10 ⁇ l of a dilution series of ADC (referred to as “Fbn-ADC” in the figure) was added. .
- Fbn-ADC a dilution series of ADC
- the result was as shown in FIG.
- the ADC of the insoluble fibrin-specific antibody showed a cancer cell growth inhibitory effect, but no significant tumor growth inhibitory effect was observed in the control. This indicates that insoluble fibrin-specific antibody-ADC has bound to the fibrin coating the plate and that the linker has been cleaved by plasmin to release MMAE and killed the tumor.
- the IC 50 of the insoluble fibrin specific antibody-ADC was 19 nM.
- Example 5 In vivo fibrin-specific antibody in vivo-anti-cancer effect of ADC
- the present inventors damage blood vessels surrounding the cancer and cause bleeding, thereby causing hemostasis. Therefore, it was hypothesized that insoluble fibrin accumulates in the vicinity of the tumor, and if an antibody that binds to the accumulated insoluble fibrin is used, an anticancer drug can be delivered to the periphery of the cancer.
- the present inventors also introduced an anti-cancer agent in an insoluble fibrin-dependent manner by introducing a plasmin cleavage site into the ADC linker, whereby the ADC that has reached the insoluble fibrin is cleaved and further activated on the insoluble fibrin.
- the concept of a new anticancer drug that releases The present inventors hypothesized that, by this, ADC accumulates in an insoluble fibrin-dependent manner, and the anticancer agent is released, thereby enhancing the cancer specificity.
- the therapeutic effect of the ADC was verified against a model having pancreatic cancer that spontaneously occurred in the above-mentioned triple mutant mice of P53, K-ras, and P48 (pancreatic cancer spontaneous development model).
- Insoluble fibrin-specific antibody-ADC 0.3 mg (converted to MMAE) / kg body weight / 3-4 days (ie, 20 mg (converted to ADC) / kg body weight / 3-4 days) ADC was administered to the model, and Kaplan-Meier curve The significance level in the log rank test was set to 0.05, and an anti-4M-Tag antibody was used as a control ADC (referred to as “Control-ADC” in the figure).
- ADC (referred to as “ ⁇ Fbn-ADC” in the figure) significantly improved the survival rate of the spontaneous pancreatic cancer model compared to the control. This proved that the hypothesis was correct.
- Example 6 Anticancer activity of the insoluble fibrin-specific antibody-ADC in a subcutaneous tumor model with fibrin deposition
- a cell line was established from a pancreatic cancer spontaneously generated from the triple mutant.
- the anticancer effect of insoluble fibrin-specific antibody-ADC was verified using a subcutaneous tumor model obtained by transplanting the cell line subcutaneously.
- a cell line was established from pancreatic cancer spontaneously generated from the triple mutant and named 5-11.
- a subcutaneous transplantation model was prepared by transplanting 5 ⁇ 10 5 of 5-11 subcutaneously to BALB / C nude mice. This subcutaneous transplant model had fibrin deposition subcutaneously.
- insoluble fibrin-specific antibody-ADC was 0.3 mg (converted to MMEA) / kg body weight / 3 to 4 days (that is, 20 mg (converted to ADC) / kg body weight / 3-4 days).
- the change of the tumor volume increase rate was observed, and the significance level of comparison with ANOVA was set to 0.01.
- ADC (referred to as “ ⁇ Fbn-ADC” in the figure) significantly suppressed the increase in tumor volume relative to the control.
- the time course of the change in body weight of the subcutaneous transplantation model was as shown in FIG. 6B. As shown in FIG. 6B, there was no significant increase / decrease in body weight, and it became clear that the ADC of the present invention can be a therapeutic drug with few side effects.
- the final concentrations of plasminogen, tPA, and ⁇ 2-antiplasmin were adjusted to the same ratio as that in normal plasma, that is, about 150 nM, about 0.03 nM, and about 100 nM, respectively.
- IC 50 was calculated from the optical density curve obtained by A450.
- the ADC having a plasmin cleavage site (referred to as “plasmin linker” in the figure) clearly showed a cell growth inhibitory effect on tumor cells, whereas the plasmin cleavage site was In the ADC (referred to as “cathepsin linker” in the figure) replaced with a linker having a cathepsin cleavage site in place of the existing linker, a cell growth inhibitory effect on tumor cells was hardly observed.
- the anti-insoluble fibrin antibody-cytotoxic agent conjugate having a linker having a plasmin cleavage site is delivered from the bloodstream to the periphery of the cancer where insoluble fibrin accumulates, and in the vicinity of fibrin.
- the linker moiety is cleaved by plasmin, releasing the cytotoxic agent around the cancer. This causes the cancer to come into contact with the cytotoxic agent. This is considered to be the mechanism of action of the ADC of the present invention.
- Cancer is more invasive to tissues as the degree of malignancy is higher. When blood vessels infiltrate, bleeding occurs, and insoluble fibrin is formed at the bleeding site.
- the ADC of the present invention is considered to be particularly effective against such highly malignant cancers. Moreover, if it was an insoluble fibrin specific antibody, even if other antibodies were used, ADC was thought to exhibit an anticancer effect similarly.
- Example 7 Antibody sequencing 5 ⁇ 10 5 cells are transferred from a 100 mm dish (Corning) to a 15 ml tube and centrifuged at 270 ⁇ g for 3 minutes at 4 ° C. After removing the supernatant, 1 ml of RNAiso Plus (Takara Bio Inc.) was added, transferred to an eppen, and vortexed. Then, it left still for 5 minutes at room temperature. Total RNA was extracted from this cell suspension using RNeasy Mini Kit (Qiagen). 200 ⁇ l of chloroform (Wako) was added to the cell suspension, vortexed for 30 seconds, and allowed to stand for 3 minutes.
- RNeasy Mini Kit Qiagen
- the sample was reacted at 72 ° C for 3 minutes using a ProFlex PCR system, and then reacted at 42 ° C for 2 minutes. After spin down, 1 ⁇ l of SMARTerIIA oligo was added. To this sample, 4 ⁇ l of Buffer Mix, 0.25 ⁇ l of RNase inhibitor, and 1 ⁇ l of SMART Scribe Reverse Transcriptase were mixed. Using the ProFlex PCR system, the reaction was performed at 42 ° C for 90 minutes, followed by reaction at 72 ° C for 10 minutes to synthesize cDNA, and then the sequence of the cDNA was decoded. The sequence of the obtained antibody was as follows.
- Heavy chain variable region of mAb (mouse IgG1) obtained from 99 clones (99-5 clone)
- Heavy chain variable region of mAb (mouse IgG1) obtained from 1101 clone
- Heavy chain variable region of mAb (mouse IgG2b) obtained from clone 0211
- SEQ ID NOS: 1 to 399 correspond to heavy chain CDRs 1 to 3 of antibody 99 respectively correspond to heavy chain variable region of SEQ ID NO: 499 antibody (amino acid numbers 1 to 19 are signal sequences)
- SEQ ID NOs: 5 to 799 correspond to the light chain CDRs 1 to 3 of the antibody respectively corresponding to the light chain variable region of the SEQ ID NO: 899 antibody (amino acid numbers 1 to 19 are signal sequences)
- SEQ ID NOs: 9 to 11 correspond to the heavy chain CDR1 to 3 of the 1101 antibody, respectively, correspond to the heavy chain variable region of the SEQ ID NO: 12 1101 antibody (amino acid numbers 1 to 19 are signal sequences)
- SEQ ID NOs: 13 to 15 correspond to the light chain CDRs 1 to 3 of the 1101 antibody, respectively, correspond to the light chain variable region of the SEQ ID NO: 16 1101 antibody (amino acid numbers 1 to 27 are signal sequences)
- SEQ ID NOs: 17-19 Corresponds to the heavy chain CDR
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Abstract
Description
(1)抗体-薬物コンジュゲート(ADC)であって、
抗体は、フィブリンに結合する抗体であり、不溶性フィブリンに対する親和性がフィブリノーゲンに対する親和性よりも高く、
薬物は、細胞傷害剤であり、
抗体と薬物とは、プラスミンにより切断可能なようにプラスミン切断部位を有するリンカーにより連結されている、ADC。
(2)上記(1)に記載のADCであって、
リンカーが、プラスミン切断部位として、バリン-ロイシン-リジンのペプチド配列を有する、ADC。
(3)上記(1)または(2)に記載のADCを含む、がんを治療することに用いるための医薬組成物。
(4)がんが、浸潤性がんである、上記(3)に記載の医薬組成物。
(5)フィブリンに結合する抗体であって、
配列番号1に示されるCDR1と、配列番号2に示されるCDR2と、配列番号3に示されるCDR3とを有する重鎖可変領域と、
配列番号5に示されるCDR1と、配列番号6に示されるCDR2と、配列番号7に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;若しくは、該抗体とフィブリンへの結合に関して競合する抗体;または、これらの抗原結合性断片。
(6)フィブリンに結合する抗体であって、
配列番号4に示される重鎖可変領域と、配列番号8に示される軽鎖可変領域とを有する、抗体、またはその抗原結合性断片。
(7)フィブリンに結合する抗体であって、
配列番号9に示されるCDR1と、配列番号10に示されるCDR2と、配列番号11に示されるCDR3とを有する重鎖可変領域と、
配列番号13に示されるCDR1と、配列番号14に示されるCDR2と、配列番号15に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;若しくは、該抗体とフィブリンへの結合に関して競合する抗体;または、これらの抗原結合性断片。
(8)フィブリンに結合する抗体であって、
配列番号12に示される重鎖可変領域と、配列番号16に示される軽鎖可変領域とを有する、抗体、またはその抗原結合性断片。
(9)抗体が、上記(5)~(8)のいずれかに記載の抗体である、上記(1)または(2)に記載のADC。
(10)上記(9)に記載のADCを含む、医薬組成物。
(11)がんを治療することに用いるための上記(10)に記載の医薬組成物。
ある態様では、リンカーは、第1のスペーサーおよびプラスミン切断配列を含む。ある態様では、リンカーは、第1のスペーサー、プラスミン切断配列、および第2のスペーサーを含む。ある特定の対象では、リンカーは、PEG、プラスミン切断配列、およびPABCを含む。
ある態様では、リンカーは、プラスミン切断配列以外の開裂性部分を含まない。
抗体とリンカーとの結合は、例えば抗体のスルフヒドリル基にマレイミド基を介して連結することができる。
ある態様では、抗体は、そのスルフヒドリル基を介して、マレイミド-PEG-プラスミン切断配列を有するリンカーで抗がん剤と連結されている。ある態様では、抗体は、そのスルフヒドリル基を介して、マレイミド-PEG-プラスミン切断配列-PABCを有するリンカーで抗がん剤と連結されている。
いずれにしても、本発明のADCでは、抗がん剤は、プラスミンにより切断可能なプラスミン切断部位を有するリンカーで抗がん剤と連結されており、当該ADCが不溶性フィブリンが蓄積した箇所に到達すると、その周囲に存在するプラスミンにより、リンカーがプラスミン切断部位で切断され、不溶性フィブリンの周辺に抗がん剤を放出する。がん組織の周辺には、がんの浸潤による出血に基づいて不溶性フィブリンが蓄積した箇所が多数存在していると考えられ(図8参照)、本発明の抗体(すなわち、不溶性フィブリン特異的抗体)は、薬物デリバリーシステムにおけるがんの標的化に有用であり、本発明のADCはがんの治療薬として有用であると考えられる。
フィブリンに結合する抗体であって、
配列番号1に示されるCDR1と、配列番号2に示されるCDR2と、配列番号3に示されるCDR3とを有する重鎖可変領域と、
配列番号5に示されるCDR1と、配列番号6に示されるCDR2と、配列番号7に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;および、該抗体とフィブリンへの結合に関して競合する抗体。これらの抗体は、不溶性フィブリン特異的抗体として用いることができる。
フィブリンに結合する抗体であって、
配列番号4に示される重鎖可変領域と、配列番号8に示される軽鎖可変領域とを有する、抗体。この抗体は、不溶性フィブリン特異的抗体として用いることができる。
この抗体は、
配列番号1に示されるCDR1と、配列番号2に示されるCDR2と、配列番号3に示されるCDR3とを有する重鎖可変領域と、
配列番号5に示されるCDR1と、配列番号6に示されるCDR2と、配列番号7に示されるCDR3とを有する軽鎖可変領域と、
を有する抗体とも言える。
フィブリンに結合する抗体であって、
配列番号9に示されるCDR1と、配列番号10に示されるCDR2と、配列番号11に示されるCDR3とを有する重鎖可変領域と、
配列番号13に示されるCDR1と、配列番号14に示されるCDR2と、配列番号15に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;および、該抗体とフィブリンへの結合に関して競合する抗体。これらの抗体は、不溶性フィブリン特異的抗体として用いることができる。
フィブリンに結合する抗体であって、
配列番号12に示される重鎖可変領域と、配列番号16に示される軽鎖可変領域とを有する、抗体。この抗体は、不溶性フィブリン特異的抗体として用いることができる。
この抗体は、
配列番号9に示されるCDR1と、配列番号10に示されるCDR2と、配列番号11に示されるCDR3とを有する重鎖可変領域と、
配列番号13に示されるCDR1と、配列番号14に示されるCDR2と、配列番号15に示されるCDR3とを有する軽鎖可変領域と、
を有する抗体とも言える。
本実施例では、フィブリノーゲンに対するよりも不溶性フィブリンに対する親和性が選択的に高い抗体(以下、「不溶性フィブリン特異的抗体」とよぶ)を作製した。
本実施例では、配列番号26のアミノ酸配列を有するペプチドおよび配列番号27のアミノ酸配列を有するペプチドを免疫原として動物に免疫して抗体を得た。
マウスに対する免疫は以下の通り行った。マウスに対する免疫は2週間おきに6回行った。
免疫1回目と4回目の免疫原の調製は以下の通りであった。配列番号26のアミノ酸配列を有するペプチドおよび配列番号27のアミノ酸配列を有するペプチドをそれぞれ免疫原として用いた。滅菌したPBSで0.5 mg/mlに調整した免疫原を作製し、1 mlのシリンジに入れた。その免疫原と等量のFreund’s Complete Adjuvant (Difco社)を別の1 mlのシリンジに入れ、それぞれのシリンジをアダプターで繋ぎ合わせ、抵抗を感じるまで互いに押し出した。免疫1回目と4回目では、免疫原は腹腔に200 μl投与した。
免疫2, 3, 5, 6回目の免疫原の調製は以下の通りであった。滅菌したPBSで0.5 mg/mlに調整した免疫原を作製し、その免疫原と等量のGERBU ADJUVANT 100 (ナカライテスク社)を1.5 ml tube内で混合し、1 mlのシリンジに入れた。免疫2, 3, 5, 6回目では、免疫原は腹腔に100 μl投与した。最終免疫は滅菌したPBSで0.1 mg/mlに調整した免疫原を作製
し、1 mlのシリンジに入れた。免疫原はまず腹腔に100 μl投与し、10分後に尾静脈に400μl投与した。
マウスは最終免疫の1週間前に尾静脈から採血を行った。4,000 ×g、10分、4℃で遠心し、上清を回収し、サンプルとした。抗体価測定は100倍希釈から12800倍希釈まで2倍ずつ段階的に希釈したサンプルを用いてELISAで行った。ELISAを行うにあたり、事前に抗原固相化プレートの準備を行った。TBS (pH8.5)でFibrinogen from human plasma (SIGMA社)を溶解し、20 μg/mlのフィブリノーゲン溶解液を作製した。96 wellイムノプレートに50 μl/wellずつ添加し4℃で一晩静止したものをフィブリノーゲンプレートとした。このフィブリノーゲンプレートにトロンビン希釈液 [7 mM L-Cystein (Wako社), 1 mM CaCl2 (Wako社), TBS (pH 8.5)]で0.05 NIH U/mlに希釈したトロンビンを各wellに100 μlずつ添加し、37°Cで2時間インキュベートしたものをフィブリンプレートとした。各抗原を固相化したプレートを200 μlのPBS-T (PBS, 0.5% (v/v) Tween20)で3回洗浄し、各wellに200 μLのブロッキング溶液 [PBS-T, 1% (w/v)BSA]を加え、室温で1時間静置してブロッキングを行った。段階希釈したサンプルを50 μl/wellずつ添加し室温で1時間静止した。溶液を捨てPBS-Tで3回洗浄し、ブロッキング溶液で0.3 μg/mlに希釈した二次抗体を各wellに50 μlずつ添加し室温で30分間静止した。二次抗体はPolyclonal Rabbit Anti-Mouse Immunoglobulins/HRP (Dako社)とPolyclonal Rabbit Anti-Rat Immunoglobulins /HRP (Dako社)をサンプルに応じて使い分けた。溶液を捨てPBS-Tで3回洗浄し、発色基質溶液 (1-StepTM Slow TMB-ELISA Substrate Solution, Thermo Fisher Scientific社)を各wellに100 μlずつ添加し、室温で10分間反応させた。2N H2SO4を各wellに30 μlずつ添加し反応を停止させた。450 nmの波長の吸光度をSpectra Max paradigm (Molecular Devices社)で測定した。
マウスから脾臓を外科的に摘出し、RPMI 1640に200 units/ml Penicillin-200 μg/ml Streptomycin-500 ng/ml Amphotericin Bを添加した培地に浸した。シリンジ 10 ml (TERUMO社)と注射針 22G (TERUMO社)を用いてRPMI1640を脾臓に注入し、脾細胞を取り出し、EASY strainer 70 μm メッシュ (greiner 社)を通した。回収した細胞懸濁液は270 ×g、5 min、室温の条件で遠心して、上清を除去後、10 mlのRPMI 1640に懸濁した。このRPMI 1640による洗浄を2回繰り返し、5 mlのRPMI 1640に懸濁し、マウスの腸骨リンパ節を用いた細胞融合のように細胞融合を行った。
細胞融合を行って10日後からELISAでスクリーニングを開始した。1次スクリーニングでは全てのwellから培養上清を50 μl分注し、1次抗体として用いた。免疫に使用したペプチドを固相化したプレートを準備した。ペプチドをリン酸緩衝液で20 μg/mlに希釈し、96 wellイムノプレート (MAXI BREAKAPART NUNC-IMMUNO MODULE, nunc社)の各wellに50μlずつ加え、室温で1時間静置して固相化を行った。固相化後は抗体価測定と同じような方法でELISAを行った。これにより抗体を産生している細胞があるwellを確認した。
2次スクリーニングでは1次スクリーニングで陽性だったwellのみから培養上清を50 μl分注し、1次抗体として用いた。フィブリンプレートおよびフィブリノーゲンプレートを用いて抗体価測定と同じような方法でELISAを行った。これにより不溶性フィブリン特異的な抗体を産生している細胞があるwellを確認した。2次スクリーニングで陽性だったwellに関しては200 μl目盛付チップ イエロー (Watson社)を用いてコロニーピッキングを行った。コロニーにチップを押し当て5 μl吸い取り、新しいCostar 96-Well Cell Culture Platesに播種した。
3次スクリーニングではコロニーを播種したwellから培養上清を50 μl分注し、1次抗体として用いた。フィブリンプレートおよびフィブリノーゲンプレートを用いて抗体価測定と同じような方法でELISAを行った。3次スクリーニングで陽性だったwellの細胞を限界希釈した。
4次スクリーニングでは単一細胞のwellのみから培養上清を50 μl分注し、1次抗体として用いた。フィブリンプレートおよびフィブリノーゲンプレートを用いて抗体価測定と同じような方法でELISAを行った。これにより不溶性フィブリン特異的な抗体を産生する細胞を選択した。
配列番号26のアミノ酸配列を有するペプチドを免疫したマウスから99-5クローンが得られた。また、配列番号27のアミノ酸配列を有するペプチドを免疫したマウスから1101クローンが得られた。以下、この「99-5クローン」を単に「99クローン」と呼ぶことがある。
本実施例では、ELISAおよび表面プラズモン共鳴(SPR)により抗体の親和性を検証した。
ELISAを行うにあたり、事前に抗原固相化プレートの準備を行った。TBS (pH8.5)でFibrinogen from human plasma (SIGMA社)を溶解し、20 μg/mlのフィブリノーゲン溶解液を作製した。96 wellイムノプレートに50 μl/wellずつ添加し4℃で一晩静止したものをフィブリノーゲンプレートとした。このフィブリノーゲンプレートにトロンビン希釈液 [7 mM L-Cystein (Wako社), 1 mM CaCl2 (Wako社), TBS (pH 8.5)]で0.05 NIH U/mlに希釈したトロンビンを各wellに100 μlずつ添加し、37°Cで2時間インキュベートしたものをフィブリンプレートとした。各抗原を固相化したプレートを200 μlのPBS-T (PBS, 0.5% (v/v) Tween20)で3回洗浄し、各wellに200 μLのブロッキング溶液 [PBS-T, 1% (w/v)BSA]を加え、室温で1時間静置してブロッキングを行った。PBSで段階希釈したサンプルを50 μl/wellずつ添加し室温で1時間静止した。溶液を捨てPBS-Tで3回洗浄し、ブロッキング溶液で0.3 μg/mlに希釈した二次抗体を各wellに50 μlずつ添加し室温で30分間静止した。二次抗体はPolyclonal Rabbit Anti-Mouse Immunoglobulins/HRP (Dako社)とPolyclonal Rabbit Anti-Rat Immunoglobulins /HRP (Dako社)をサンプルに応じて使い分けた。溶液を捨てPBS-Tで3回洗浄し、発色基質溶液を各wellに100 μlずつ添加し、室温で10分間反応させた。2N H2SO4を各wellに30 μlずつ添加し反応を停止させた。450 nmの波長の吸光度をSpectra Max paradigm (Molecular Devices社)で測定した。
抗原が不溶性である場合には、SPRによる親和性の検証には適していないが、抗体同士の相対的な親和性の強さを比較するため参考として測定した。
抗体の不溶性フィブリンに対する親和性をBiacore T200 (GE Healthcare社)を用いて表面プラズモン共鳴 (Surface plasmon resonance: SPR)解析から算出し、抗体の分子間相互作用の評価を行った。流路で使用するbufferにはHBS-N buffer (GE Healthcare社)を用いた。10 mM sodium acetate, pH 5.5 (GE Healthcare社)で102-10のエピトープ部分のペプチド(WO2016/167227参照)を1 μg/mlに希釈し、センサーチップ (Biacore sensor chip CM5, GE Healthcare社)に固定化した。固定化はamine coupling kit (BR-1000-50, GEHeathcare社)を用いて、固定化量を90 RUに設定して行った。次に1×HBS-N bufferで48.875、93.75、187.5、375、750、1500 nMに希釈した抗体を用いて、マルチサイクルカイネティクス法にて表1の条件で抗原抗体反応を行った。測定後はKD値、kd値、ka値を求めるためにBIAevaluation (GE Healthcare社)を用いて解析を行った。
本実施例では、Y. Kawaguchi、C. Wright、D. Tuvesonから提供されたLSL-KrasG12D/+とPtf1a-Cre、National Cancer Institute at Frederickから提供されたLSL-Trp53R172H/+をかけ合わせてp53、p48、およびK-Rasの三重変異マウス (膵臓がんモデルマウス)を作製し、三重変異マウス由来の膵臓がん細胞株を樹立することができたため、その細胞株を用いてin vivo imagingを行った。この三重変異マウスはヒト膵がんの発生を模倣すると報告されている。膵臓がん細胞株は500 mlのRPMI 1640 (Wako社) に非働化した100 ml Fetal Bovine Serum (FBS, gibco社)と10 mlの100 units/ml Penicillin- 100 μg/ml Streptomycin -250 ng/ml Amphotericin B (Wako社)を添加した培地で培養した。そして、培養上清を除去し、PBS (Invitrogen社)を用いて洗浄し、2 mlの Trypsin-EDTA [0.25% (w/v) Trypsin-1.0 mmol/l thylenediaminetetraacetic acid ・4Na Solution with Phenol Red, 和光純薬工業社]を添加し、細胞をピペッティングで剥がし、15 ml tube (corning社)に入れた。270 ×g、3 min、4℃の条件で遠心機 (ユニバーサル遠心機5800, KUBOTA社)を用いて遠心し、上清を除去した。10 mlのPBSで再懸濁し、270 ×g、3 min、4℃の条件で遠心した。これを三回繰り返し、PBSで2×106 cells/50 μlに調整し、5週齢のBALB/c Slc nu/nuマウス (日本SLC社)の左足の付け根に1匹当たり50 μlずつ皮下注射した。1か月後、Alexa647標識した抗不溶性フィブリン抗体とコントロール抗体を1匹当たり300 μg尾静脈投与した。コントロールにはInVivoMAb Mouse IgG1 Isotype control (BioXCell社)を使用した。投与後1時間後、1日目、3日目、5日目、7日目にin vivo生体観察システム OV110 (olympus社)で撮影を行った。
本実施例では、得られた不溶性フィブリン特異的抗体にモノメチルオーリスタチンE(MMAE)を連結した抗体薬物コンジュゲート(ADC)を作製し、その抗がん作用を検証した。
1H NMR (400 MHz, CDCl3): d 8.01 (br, 1H), 7.76 (br, 1H), 7.05-7.60 (m, 13H), 6.78 (d, J = 6.8 Hz, 2H), 5.49 (br, 1H), 5.25 (br, 1H), 4.94 (br, 1H), 4.77 (s, 2H), 4.04 (s, 3H), 4.00-4.85 (m, 3H), 3.75 (s, 3H), 3.55-3.90 (m, 2H), 3.26 (d, J =19.6 Hz, 1H), 3.00 (d, J = 19.6 Hz, 1H), 2.32 (br, 1H), 1.26 (s, 3H), 1.05-2.25(m, 15H), 0.70-1.05 (m, 12H); HRMS (ESI-MS) : calcd for C72H85N6O17: 1305.5971 [M+H]+; found 1305.5935.
MS (MALDI-TOFMS) calcd for [C99H132N10O15+K]+ 1739.95; found 1741.37.
MS (MALDI-TOFMS) calcd for [C94H122N10O13+K]+ 1519.02; found 1519.65.
MS (MALDI-TOFMS) calcd for [C118H180N12O29+K-Mmt]+ 1997.51; found 1999.49.
MS (MALDI-TOFMS) calcd for [C98H164N12O28+K]+ 1997.51; found 1998.31.
フィブリンプレートから培養液を除去し、プラスミノーゲン、tPA、α2-抗プラスミンを含む上記溶液を90μl添加し、その後、ADC(図中、「Fbn-ADC」と称する)の希釈系列を10μl添加した。対照として、不溶性フィブリン抗体単体(図中、「IgG」と称する)および図3の抗体として抗4M-Tag抗体(対照IgG)を用いたADC(図中、「Control-ADC」と称する)を用いた。37℃で72時間インキュベートし、その後、培養液を除去して、CCK-8(同仁化学):培養液=1:10の割合で混合した反応液を添加して、37℃で3時間インキュベートした。A450により求めた光学密度曲線からIC50を算出した。
本発明者らは、体内でがんが増殖するとがんを取り巻く血管を損傷し、出血を生じること、これによって止血のために不溶性フィブリンが腫瘍付近に蓄積し、蓄積した不溶性フィブリンに結合する抗体を用いればがん周辺に抗がん剤を送達できると仮説した。本発明者らはまた、ADCのリンカーにプラスミン切断部位を導入することにより、不溶性フィブリンに到達したADCが切断され、さらに不溶性フィブリン上で活性化したプラスミンにより、不溶性フィブリン依存的に抗がん剤を放出する、新しい抗がん剤の概念を創出した。本発明者らは、これにより不溶性フィブリン依存的にADCが蓄積し、かつ抗がん剤が放出されることにより、がん特異性を高めることができると仮説した。
本実施例では、上記3重変異体から自然発生した膵がんから細胞株を樹立し、当該細胞株を皮下移植して得られた皮下腫瘍モデルを用いて、不溶性フィブリン特異的抗体-ADCの抗がん作用を検証した。
44As3を3000 cells/wellで得られたフィブリンコート及び非コートプレートに播種し、37℃で一晩培養した。培養液としては、10%FBSを含むRPMI培地とした。
カテプシンリンカー(バリン-シトルリンを有する)を用いたADC並びにプラスミンリンカーを用いたADCをそれぞれ終濃度で0~3 nM(MMAE換算)となるように希釈系列を調整した。
プラスミノーゲン、tPA、α2-抗プラスミンの終濃度が、正常血漿中の濃度と同比程度、すなわち、それぞれ約150nM、約0.03nM、約100nMとなるように調整した。
各プレートから培養液を除去し、プラスミノーゲン、tPA、α2-抗プラスミンを含む上記溶液を90μl添加し、その後、ADCの希釈系列をそれぞれのプレートに10 μl添加した。37℃で72時間インキュベートし、その後、培養液を除去して、CCK-8(同仁化学):培養液=1:10の割合で混合した反応液を添加して、37℃で2時間インキュベートした。A450により求めた光学密度曲線からIC50を算出した。
5×105 個の細胞を100 mm dish (Corning社)から15 ml tubeに移し、270 ×g、3分、4°Cの条件で遠心する。上清を除去後、RNAiso Plus (タカラバイオ社) を1 ml加えて、エッペンに移し、vortexを行った。その後、室温で5分間静置した。この細胞懸濁液から、RNeasy Mini Kit (Qiagen社) を用いてtotal RNAを抽出した。細胞懸濁液にクロロホルム (Wako社) を200 μl加え、30秒間vortexし、3分間静置した。その後20,400 ×g、15分、4°Cの条件で遠心して、500 μlの上清を回収した。回収した上清に500 μlの70% EtOHを加えて、その溶液をRNeasy Mini spin column へ移した。15,000 ×g、1 min、室温の条件で遠心し、フロースルーを捨て、700 μlのBuffer RW1 (Qiagen社)を加え、8,000 ×g、1 min、室温の条件で遠心した。フロースルーを捨て、500 μlのBuffer RPE (Qiagen社)を加え、8,000 ×g、1 min、室温の条件で遠心した。この洗浄を3回繰り返し、最後に50μlの滅菌蒸留水を加え、20,400 ×g、1 min、室温の条件で遠心し、RNAを抽出した。
SMARTer RACE cDNA Amplification Kit (タカラバイオ社)を用いて、抽出したRNAからcDNAを合成した。あらかじめBuffer Mix(5×First-Strand buffer 2 μl, 20 mM DTT 1 μl, 10 mM dNTP Mix 1 μl)を調整し、室温に置いた。PCR用8連tube (Thermo Scientific社) に5'-CDS primer-A を1 μl取り、total RNA 300 ng を加えた後、Nuclease-free Waterを用いて3.75 μlにメスアップした。そのサンプルをProFlex PCR systemを用いて、72°Cで3分間反応を行った後、42°Cで2分間反応を行った。スピンダウン後、SMARTerIIAオリゴを1 μl加えた。このサンプルに4 μlのBuffer Mix、0.25 μlの RNase inhibitor、1 μlのSMART Scribe Reverse Transcriptaseを混合した溶液を加えた。ProFlex PCR systemを用いて、42°Cで90分間反応を行った後、72°Cで10分間反応を行い、cDNAを合成し、その後、cDNAの配列を解読した。得られた抗体の配列は以下の通りであった。
配列番号1~3 99抗体の重鎖CDR1~3にそれぞれ対応
配列番号4 99抗体の重鎖可変領域に対応(アミノ酸番号1~19がシグナル配列である)
配列番号5~7 99抗体の軽鎖CDR1~3にそれぞれ対応
配列番号8 99抗体の軽鎖可変領域に対応(アミノ酸番号1~19がシグナル配列である)
配列番号9~11 1101抗体の重鎖CDR1~3にそれぞれ対応
配列番号12 1101抗体の重鎖可変領域に対応(アミノ酸番号1~19がシグナル配列である)
配列番号13~15 1101抗体の軽鎖CDR1~3にそれぞれ対応
配列番号16 1101抗体の軽鎖可変領域に対応(アミノ酸番号1~27がシグナル配列である)
配列番号17~19 0211抗体の重鎖CDR1~3にそれぞれ対応
配列番号20 0211抗体の重鎖可変領域に対応(アミノ酸番号1~19がシグナル配列である)
配列番号21~23 0211抗体の軽鎖CDR1~3にそれぞれ対応
配列番号24 0211抗体の軽鎖可変領域に対応(アミノ酸番号1~20がシグナル配列である)
配列番号25 ヒトフィブリンBβ鎖
配列番号26 99の免疫原として使用したヒトフィブリンBβ鎖断片
配列番号27 1101の免疫原として使用したヒトフィブリンBβ鎖断片
配列番号28 免疫原として利用できるヒトフィブリンBβ鎖断片(No.2ペプチド)
Claims (11)
- 抗体-薬物コンジュゲート(ADC)であって、
抗体は、フィブリンに結合する抗体であり、不溶性フィブリンに対する親和性がフィブリノーゲンに対する親和性よりも高く、
薬物は、細胞傷害剤であり、
抗体と薬物とは、プラスミンにより切断可能なようにプラスミン切断部位を有するリンカーにより連結されている、ADC。 - 請求項1に記載のADCであって、
リンカーが、プラスミン切断部位として、バリン-ロイシン-リジンのペプチド配列を有する、ADC。 - 請求項1または2に記載のADCを含む、がんを治療することに用いるための医薬組成物。
- がんが、浸潤性がんである、請求項3に記載の医薬組成物。
- フィブリンに結合する抗体であって、
配列番号1に示されるCDR1と、配列番号2に示されるCDR2と、配列番号3に示されるCDR3とを有する重鎖可変領域と、
配列番号5に示されるCDR1と、配列番号6に示されるCDR2と、配列番号7に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;若しくは、該抗体とフィブリンへの結合に関して競合する抗体;または、これらの抗原結合性断片。 - フィブリンに結合する抗体であって、
配列番号4に示される重鎖可変領域と、配列番号8に示される軽鎖可変領域とを有する、抗体、またはその抗原結合性断片。 - フィブリンに結合する抗体であって、
配列番号9に示されるCDR1と、配列番号10に示されるCDR2と、配列番号11に示されるCDR3とを有する重鎖可変領域と、
配列番号13に示されるCDR1と、配列番号14に示されるCDR2と、配列番号15に示されるCDR3とを有する軽鎖可変領域と、
を有する、抗体;若しくは、該抗体とフィブリンへの結合に関して競合する抗体;または、これらの抗原結合性断片。 - フィブリンに結合する抗体であって、
配列番号12に示される重鎖可変領域と、配列番号16に示される軽鎖可変領域とを有する、抗体、またはその抗原結合性断片。 - 抗体が、請求項5~8のいずれか一項に記載の抗体である、請求項1または2に記載のADC。
- 請求項9に記載のADCを含む、医薬組成物。
- がんを治療することに用いるための請求項10に記載の医薬組成物。
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| US16/609,668 US11311626B2 (en) | 2017-05-02 | 2018-04-27 | Plasmin-cleavable anti-insoluble fibrin antibody-drug conjugate |
| JP2019515717A JP7204132B2 (ja) | 2017-05-02 | 2018-04-27 | プラスミンにより切断可能な抗不溶性フィブリン抗体と薬物とのコンジュゲート |
| CN201880029030.1A CN110582514B (zh) | 2017-05-02 | 2018-04-27 | 纤溶酶可切割的抗不溶性纤维蛋白的抗体与药物的偶联物 |
| EP18794602.5A EP3620471A4 (en) | 2017-05-02 | 2018-04-27 | ANTIBODY-ANTI-FIBRIN DRUG CONJUGATE INSOLUBLE, POSSIBLE TO BE CLIVID BY PLASMINE |
| BR112019022643-5A BR112019022643A2 (pt) | 2017-05-02 | 2018-04-27 | conjugado de fármaco-anticorpo anti-fibrina insolúvel clivável por plasmina |
| SG11201910113P SG11201910113PA (en) | 2017-05-02 | 2018-04-27 | Plasmin-cleavable anti-insoluble fibrin antibody-drug conjugate |
| CA3060719A CA3060719A1 (en) | 2017-05-02 | 2018-04-27 | Plasmin-cleavable anti-insoluble fibrin antibody-drug conjugate |
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| JP2017-091639 | 2017-05-02 |
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| US (1) | US11311626B2 (ja) |
| EP (1) | EP3620471A4 (ja) |
| JP (1) | JP7204132B2 (ja) |
| CN (1) | CN110582514B (ja) |
| BR (1) | BR112019022643A2 (ja) |
| CA (1) | CA3060719A1 (ja) |
| SG (1) | SG11201910113PA (ja) |
| TW (1) | TW201842938A (ja) |
| WO (1) | WO2018203517A1 (ja) |
Cited By (5)
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| WO2021055865A1 (en) * | 2019-09-19 | 2021-03-25 | Seagen Inc. | Selective drug release from internalized conjugates of biologically active compounds |
| WO2021200932A1 (ja) | 2020-03-31 | 2021-10-07 | 国立研究開発法人国立がん研究センター | フィブリンに結合する抗体および当該抗体を含む医薬組成物 |
| WO2021200922A1 (ja) | 2020-03-31 | 2021-10-07 | 国立研究開発法人国立がん研究センター | フィブリンクロットを溶解させることに適した融合タンパク質および当該融合タンパク質を含む医薬組成物 |
| WO2023195535A1 (ja) | 2022-04-08 | 2023-10-12 | 株式会社凜研究所 | フィブリンに結合する抗体および当該抗体を含むフィブリン溶解性タンパク質および当該タンパク質を含む医薬製剤 |
| US12036286B2 (en) | 2021-03-18 | 2024-07-16 | Seagen Inc. | Selective drug release from internalized conjugates of biologically active compounds |
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- 2018-04-27 BR BR112019022643-5A patent/BR112019022643A2/pt unknown
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| JP2022548306A (ja) * | 2019-09-19 | 2022-11-17 | シージェン インコーポレイテッド | 内部移行した生物学的に活性な化合物の結合体からの選択的な薬物放出 |
| JP7814303B2 (ja) | 2019-09-19 | 2026-02-16 | シージェン インコーポレイテッド | 内部移行した生物学的に活性な化合物の結合体からの選択的な薬物放出 |
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| JPWO2021200922A1 (ja) * | 2020-03-31 | 2021-10-07 | ||
| KR20220161374A (ko) | 2020-03-31 | 2022-12-06 | 국립연구개발법인 고쿠리츠간켄큐센터 | 피브린에 결합하는 항체 및 당해 항체를 포함하는 의약 조성물 |
| CN115552012A (zh) * | 2020-03-31 | 2022-12-30 | 国立研究开发法人国立癌症研究中心 | 适于溶解纤维蛋白凝块的融合蛋白及包含该融合蛋白的药物组合物 |
| WO2021200922A1 (ja) | 2020-03-31 | 2021-10-07 | 国立研究開発法人国立がん研究センター | フィブリンクロットを溶解させることに適した融合タンパク質および当該融合タンパク質を含む医薬組成物 |
| JP7704339B2 (ja) | 2020-03-31 | 2025-07-08 | 国立研究開発法人国立がん研究センター | フィブリンクロットを溶解させることに適した融合タンパク質および当該融合タンパク質を含む医薬組成物 |
| JP7708374B2 (ja) | 2020-03-31 | 2025-07-15 | 国立研究開発法人国立がん研究センター | フィブリンに結合する抗体および当該抗体を含む医薬組成物 |
| US12509507B2 (en) | 2020-03-31 | 2025-12-30 | National Cancer Center | Fusion protein suitable for dissolving fibrin clot, and pharmaceutical composition containing said fusion protein |
| WO2021200932A1 (ja) | 2020-03-31 | 2021-10-07 | 国立研究開発法人国立がん研究センター | フィブリンに結合する抗体および当該抗体を含む医薬組成物 |
| US12600797B2 (en) * | 2020-03-31 | 2026-04-14 | Rin Institute Inc. | Fibrin-binding antibody and pharmaceutical composition containing antibody |
| US12036286B2 (en) | 2021-03-18 | 2024-07-16 | Seagen Inc. | Selective drug release from internalized conjugates of biologically active compounds |
| WO2023195535A1 (ja) | 2022-04-08 | 2023-10-12 | 株式会社凜研究所 | フィブリンに結合する抗体および当該抗体を含むフィブリン溶解性タンパク質および当該タンパク質を含む医薬製剤 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3620471A1 (en) | 2020-03-11 |
| JP7204132B2 (ja) | 2023-01-16 |
| SG11201910113PA (en) | 2019-11-28 |
| CA3060719A1 (en) | 2018-11-08 |
| EP3620471A4 (en) | 2021-01-06 |
| BR112019022643A2 (pt) | 2020-05-19 |
| CN110582514B (zh) | 2024-03-01 |
| TW201842938A (zh) | 2018-12-16 |
| JPWO2018203517A1 (ja) | 2020-03-12 |
| CN110582514A (zh) | 2019-12-17 |
| US20200147231A1 (en) | 2020-05-14 |
| US11311626B2 (en) | 2022-04-26 |
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