WO2010055950A1 - 癌間質の構成因子に対して特異的結合能を有する物質と抗腫瘍性化合物との複合体による新規の癌ターゲティング治療 - Google Patents
癌間質の構成因子に対して特異的結合能を有する物質と抗腫瘍性化合物との複合体による新規の癌ターゲティング治療 Download PDFInfo
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- WO2010055950A1 WO2010055950A1 PCT/JP2009/069509 JP2009069509W WO2010055950A1 WO 2010055950 A1 WO2010055950 A1 WO 2010055950A1 JP 2009069509 W JP2009069509 W JP 2009069509W WO 2010055950 A1 WO2010055950 A1 WO 2010055950A1
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- C07K—PEPTIDES
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- C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
Definitions
- the present invention relates to the use of a substance having a specific binding ability to a stroma constituent factor for the delivery of an antitumor compound to a tumor site.
- the present invention relates to a substance having a specific binding ability to a stroma component and an antitumor site (eg, an antitumor compound, a functional structure capable of sustained release of an antitumor compound).
- the present invention relates to a composite of the present invention and its use.
- Non-Patent Documents 1 and 2 except for some approvals for lymphoma and leukemia (Non-Patent Documents 1 and 2), and the clinical usefulness of missile therapy for normal solid cancers such as lung cancer, colon cancer, breast cancer, and gastric cancer Has not been proved until now (Non-Patent Documents 3 to 11).
- intractable cancers such as pancreatic cancer, skill gastric cancer, colon cancer, and lung cancer are known to have abundant stroma.
- Collagen frequently found in the interstitium is also present in a normal living body, but is developed in an inflamed tissue or a tumor tissue having a tissue system similar to that (Non-patent Document 12).
- Type IV collagen is abundant around tumor blood vessels, and type I and type III collagen grows between tumor cells and tumor blood vessels. The degree varies greatly depending on the type of tumor, but generally refractory cancers to which drugs are not effective are particularly rich in interstitium typified by collagen.
- human tumor tissue has more stroma than mouse tumor tissue.
- Anti-tumor compound SN-38 has already been clinically applied as a prodrug called CPT-11, but because it is a small molecule, normal tissue and tumor tissue cannot be distinguished from each other and distributed to tumors for a long time. I can't do that either. Therefore, the problem that SN-38, which is the active substance, has a time-dependent antitumor effect, is not utilized, and side effects are strongly pointed out (Non-Patent Documents 14 to 17).
- Antibody-directed cytotoxic agents use of monoclonalantibody to direct the action of toxin A chains to colorectal carcinoma cells. Proc Natl Acad Sci U S A. 1980 Aug; 77-43 (8) Blythman HE et al. Immunotoxins: hybrid molecules of monoclonal antibodies and a toxin subunit specifically kill tumour cells. Nature. 1981 Mar 12; 290 (5802): 145-6 Tsukada Y et al. Chemotherapy by intravenous administration of conjugates of daunomycin with monoclonal and conventional anti-rat alpha-fetoprotein antibodies. Proc Natl Acad Sci U S A. 1982 Dec; 79 (24): 7896-9 Hurwitz E et al.
- An object of the present invention is to provide a complex that stays specifically in the stroma for a long time and acts on tumor blood vessels and / or tumor cells to exert an antitumor effect.
- stroma typified by collagen is abundant around the tumor and may inhibit the access of antitumor compounds to tumor cells.
- an antitumor site eg, an antitumor compound, a functional structure capable of sustained release of an antitumor compound
- the body has been found to exhibit superior antitumor activity by acting on tumor blood vessels and / or tumor cells rather than a complex of an antibody against an antigen on the surface of tumor cells and an antitumor compound, The present invention has been completed.
- the present invention provides the following.
- a complex comprising a substance having a specific binding ability to a stroma constituent factor and an antitumor site bound to the substance.
- the antitumor site is a functional structure capable of sustained release of the antitumor compound.
- a method for inhibiting tumor blood vessel formation in a mammal comprising administering an effective amount of the complex according to [1] to the mammal.
- a complex that is specific to the stroma and stays for a long time and exhibits an excellent antitumor effect is provided.
- the antitumor effect of an antitumor compound having a time-dependent antitumor effect can be effectively exhibited.
- it since it acts on tumor blood vessels and / or tumor cells, it can be expected to have a significantly higher antitumor effect than conventional complexes.
- FIG. 1 shows a typical human pancreatic cancer tissue.
- FIG. 2 shows the results of analyzing EpCAM expression on the surface of tumor cells by flow cytometry.
- FIG. 3 is a diagram showing in vivo imaging of an antibody.
- FIG. 4 is a schematic diagram showing the binding of SN-38-polymer compound and antibody.
- FIG. 5 is a diagram showing the in vitro cytocidal effect of each complex.
- FIG. 6 is a diagram showing the in vivo antitumor effect of each complex.
- FIG. 7 shows the histopathological characteristics of tumors administered and not administered with anti-mouse type IV collagen antibody-SN-38 complex.
- FIG. 8 shows the alignment of the cDNA sequence of the VH site of hybridoma clone 35-4 with the corresponding cDNA sequence of rIgG2a clone BC088240.1.
- FIG. 9 is a diagram showing an alignment between the deduced amino acid sequence of the VH site of hybridoma clone 35-4 and the corresponding amino acid sequence of rIgG2a clone BC088240.1.
- FIG. 10 shows an alignment of the cDNA sequences of the VH sites of hybridoma clones 6-1, 6-2 and 56P-1 with the corresponding cDNA sequences of IgM variable region clone J00529.1 and IgM constant region clone V00827.1.
- FIG. 11 shows the alignment of the amino acid sequences of the VH sites of hybridoma clones 6-1, 6-2 and 56P-1 with the corresponding amino acid sequences of IgM variable region clone J00529.1 and IgM constant region clone V00827.1.
- FIG. 12 shows the alignment of the cDNA sequence of the VL site of the kappa chain of hybridoma clones 35-4, 6-1, 6-2 and 56P-1 and the corresponding cDNA sequence of the kappa chain clone BC088255.1. is there.
- FIG. 13 is a diagram showing an alignment between the amino acid sequence of the VL site of the ⁇ chain of the hybridoma clones 35-4, 6-1, 6-2 and 56P-1 and the corresponding amino acid sequence of the ⁇ chain clone BC088255.1. is there.
- FIG. 14 is a diagram showing the in vivo antitumor effect of anti-fibrin antibody-SN-38 complex.
- the present invention relates to a substance having a specific binding ability to a stroma constituent factor and a complex comprising an antitumor site bound to the substance.
- the complex of the present invention has a specific binding ability to a stroma constituent factor by including a substance having a specific binding ability to a stroma constituent factor as a constituent factor.
- the complex of the present invention can release the antitumor compound in a sustained state in a state where it is bound to a stroma component.
- stroma means a connective tissue that fills a gap between cells in the tissue.
- stroma means in particular the stroma of tumor tissue.
- stroma constituents include known extracellular matrix constituents.
- the component include collagen, elastin, proteoglycan, fibronectin, laminin and the like, and are not particularly limited as long as they constitute a stroma in tumor tissue, but collagen is particularly developed in tumor tissue. Therefore, it is preferable. Dozens of types of collagen are known to exist, and which type of collagen is predominantly expressed in the stroma depends on the type of tumor, but generally type IV collagen is around tumor blood vessels. Since it is abundant and type I and type III collagen grow between tumor cells and tumor blood vessels, the collagen is preferably type I, type III or type IV, more preferably type IV.
- a cancer-associated substance can also be preferably used as a stroma constituent factor.
- the cancer-associated substance refers to a substance formed in tumor blood vessels and stroma as tumor cells grow in tumor tissue.
- An example of a cancer-associated substance is fibrin.
- Examples of the substance having a specific binding ability to a stroma constituent factor include an antibody or a binding fragment thereof having a specific binding ability to a stroma constituent factor, a soluble receptor for a stroma constituent factor, or Examples thereof include binding fragments thereof, peptides having affinity for stroma constituent factors, the above-mentioned antibodies, soluble receptors, binding fragments, polymer carriers to which peptides are bound, and the like.
- the substance is preferably an antibody having a specific binding ability to a stroma constituent factor, or a binding fragment and a peptide thereof.
- “specific” means that the constituent element of the stroma can be recognized from components other than the constituent element of the specific stroma.
- the antibody includes a natural antibody such as a polyclonal antibody or a monoclonal antibody (mAb); a chimeric antibody, a humanized antibody or a single chain antibody that can be produced using a gene recombination technique; a human antibody-producing transgenic Examples include, but are not limited to, human antibodies that can be produced using animals.
- An antibody modified with PEG or the like is also included in the antibody used in the present invention.
- the antibody is a monoclonal antibody, a humanized antibody or a human antibody.
- the class of the antibody is not particularly limited, and includes antibodies having any isotype such as IgG, IgM, IgA, IgD, or IgE. IgG or IgM is preferable, and IgG is more preferable.
- the binding fragment of an antibody means a part of the antibody having a specific binding ability to a stroma constituent factor.
- Antibody binding fragments include F (ab ′) 2 , Fab ′, Fab, Fv (variable fragment of antibody), sFv, dsFv (disulphide stabilized Fv), sdAb (single domain anti-body expression) Antibody fragments (Exp. Opin. Ther. Patents, Vol. 6, No. 5, p. 441-456, 1996).
- the monoclonal antibody of the present invention can be prepared by a method known per se.
- the hybridoma method [Nature, 256, 495 (1975)]
- the recombinant DNA method (Cabilly et al., US Pat. No. 4,816,567) can also be used.
- stromal collagen is administered subcutaneously or intraperitoneally to mice together with a commercially available adjuvant 2 to 4 times, and spleen or lymph nodes are collected approximately 3 days after the final administration, and leukocytes are collected.
- the leukocytes and myeloma cells are cell-fused to obtain a hybridoma that produces a monoclonal antibody against stromal collagen.
- Cell fusion can be performed by the PEG (polyethylene glycol) method [J. Immunol. Methods, 81 (2): 223-228 (1985)] or the voltage pulse method [Hybridoma, 7 (6): 627-633 (1988)]. Also good.
- a hybridoma producing a desired monoclonal antibody can be selected by detecting an antibody that specifically binds to an antigen from the culture supernatant using a well-known EIA or RIA method.
- the hybridoma producing the monoclonal antibody can be cultured in vitro or in vivo such as mouse or rat, preferably mouse ascites, and the antibody can be obtained from the culture supernatant of the hybridoma and the ascites of the animal, respectively.
- Monoclonal antibodies of the present invention include full-length antibodies (whole antibodies), antibody fragments (antibody fragments such as Fab ′, F (ab ′) 2 , scFv (single chain antibody), etc.), derivatized antibodies, modified antibodies, etc. Can be used, but full-length antibodies are preferred.
- a chimeric antibody is obtained by ligating the DNA encoding the V region of the monoclonal antibody obtained as described above with the DNA encoding the human antibody C region, incorporating it into an expression vector, introducing it into a host, and producing it. . Using this known method, a chimeric antibody useful in the present invention can be obtained.
- a humanized antibody is also called a reshaped human antibody, which is a graft of a complementarity determining region (CDR) of a non-human mammal, for example, a mouse antibody, to the complementarity determining region of a human antibody.
- CDR complementarity determining region
- a general genetic recombination technique is also known (see European Patent Application Publication Nos. EP 125023 and WO 96/02576).
- the DNA sequence designed to link the CDR of the mouse antibody and the framework region (FR) of the human antibody has a portion that overlaps the terminal regions of both the CDR and FR.
- the prepared oligonucleotides are used as primers and synthesized by PCR (see the method described in WO 98/13388).
- a region in which the complementarity determining region forms a favorable antigen binding site is selected. If necessary, the amino acid of the framework region in the variable region of the antibody may be substituted so that the complementarity determining region of the reshaped human antibody forms an appropriate antigen-binding site (Sato, K. et al., Cancer Res. (1993) 53, 851-856).
- human antibodies are used for the C region of the chimeric antibody and humanized antibody.
- C ⁇ 1, C ⁇ 2, C ⁇ 3, C ⁇ 4 can be used for the H chain
- C ⁇ , C ⁇ can be used for the L chain.
- the human antibody C region may be modified in order to improve the stability of the antibody or its production.
- a chimeric antibody consists of a variable region of a non-human mammal-derived antibody and a constant region derived from a human antibody.
- a humanized antibody consists of a complementarity determining region of a non-human mammal-derived antibody, and a framework region and C region derived from a human antibody. Since humanized antibodies have reduced antigenicity in the human body, they are useful as antibodies used in the present invention.
- a substance having a specific binding ability to a stroma component may be modified.
- the substance can be protected from phagocytosis by macrophages or the like by modifying the substance with PEG and eliminating the charge.
- the antitumor compound that can be used in the present invention is an antitumor agent that is used in clinical and clinical trials as long as it is a compound having an activity of killing tumor cells in vivo such as an anticancer agent, a small molecule target agent, and a radionuclide. All compounds can be used without limitation including sex compounds, anti-tumor compounds developed in the future. A compound that exhibits an antitumor effect in a time-dependent manner is preferably used.
- the antitumor site means a functional structure having antitumor activity.
- the antitumor site include an antitumor compound, a functional structure capable of sustained release of the antitumor compound, and the like.
- the molecular weight of the antitumor compound is not particularly limited, but after the complex of the present invention is delivered to the stroma in the tumor tissue. It is preferable that the molecular weight is low enough to be released from the complex at the site, move through the tumor tissue, reach the entire tumor tissue, or reach the tumor cells. Such molecular weight is, for example, 15000 Da or less, preferably 10000 Da or less, and more preferably 500 Da or less.
- the molecular weight of the antitumor compound is, for example, 100 Da or more, preferably 300 Da or more. Therefore, a preferable molecular weight range of the antitumor compound is exemplified by 300 to 500 Da.
- the antitumor compound may be a compound having a hydroxyl group, a carboxyl group, or an amino group in order to facilitate binding with a substance having specific binding ability to a stroma component or a linker (described later). preferable.
- Anti-tumor compounds have their anti-tumor activity (toxicity) attenuated when bound to substances or linkers that have specific binding ability to stroma components compared to unbound states. That is, it is preferably in a prodrug state.
- the complex of the present invention When the complex of the present invention is administered to a living body, it is considered that the complex is delivered to the stroma in the tumor tissue, stays at the site, and the antitumor compound is gradually released from the complex over a long period of time. Therefore, a higher antitumor effect can be expected by using a compound having a time-dependent antitumor effect as the antitumor compound.
- time dependence of antitumor effect means that the longer the continuous exposure time to tumor cells, the greater the antitumor effect.
- antitumor compounds examples include SN-38 (10-hydroxy-7-ethylcamptothecin), adriamycin, taxol, 5-fluorouracil, nimustine, an alkylating agent such as laministin, gemcitabine, Antimetabolites such as hydroxycarbamide, plant alkaloids such as etoposide and vincristine, anticancer antibiotics such as mitomycin and bleomycin, platinum preparations such as cisplatin, molecular targeting agents such as sorafenib and erlotinib, methotrexate, cytosine arabinoside, 6 -Thioguanine, 6-mercaptopurine, cyclophosphamide, ifosfamide, busulfan, and the like, but are not limited to these.
- SN-38 is particularly suitable for use in the present invention because it is difficult to degrade in blood.
- time-dependent antitumor compounds examples include SN-38, taxol, vincristine, methotrexate, cytosine arabinoside, 6-thioguanine, and 6-mercaptopurine.
- a concentration-dependent antitumor compound is also preferably used in the present invention from the viewpoint of exposure of a high concentration of an antitumor agent to tumor cells present in tumor tissue.
- the “concentration-dependent antitumor compound” means an antitumor compound having a property that the cell killing effect is influenced by exposure to a higher concentration of an antitumor agent than time.
- 5-fluorouracil, cyclophosphamide, ifosfamide, busulfan and the like can be mentioned.
- the antitumor compound when a functional structure capable of sustained release of an antitumor compound is used as the antitumor site, the antitumor compound is the same as the case where the antitumor compound itself is used as the antitumor site. Can be used.
- Examples of the functional structure capable of gradual release of the antitumor compound include liposomes or micelles containing the antitumor compound.
- Liposomes are lipid bilayer vesicles with an aqueous interior.
- Examples of liposomes include multilamellar liposomes and monolamellar liposomes in which a number of lipid bilayers are stacked in an onion shape.
- Lipids constituting the liposome are usually phospholipids.
- Phospholipids include phosphatidylcholines such as lecithin and lysolecithin, acidic phospholipids such as phosphatidylserine, phosphatidylglycerol, phosphatidylinositol and phosphatidylic acid, or phospholipids obtained by substituting these acyl groups with lauroyl, myristoyl, oleoyl, etc. And sphingophospholipids such as phosphatidylethanolamine and sphingomyelin. Moreover, cholesterol etc. can also be added.
- Liposomes containing an antitumor compound can be produced, for example, by suspending a purified phospholipid thin film in a solution containing an antitumor compound and subjecting it to ultrasonic treatment or the like.
- Methods for producing liposomes containing antitumor compounds are well known in the art. For the production method, see, for example, Annalsnalof Oncology, vol.15, pp.517-525, 2004; Cancer Science, vol.95, pp.608-613, 2004.
- a micelle is an aggregate formed by self-association when a solute reaches a certain concentration or higher in a solution.
- a micelle containing an antitumor compound can be prepared, for example, by dissolving a block copolymer and an antitumor compound in an organic solvent (eg, CHCl 3 ), evaporating the solvent, adding an aqueous solvent, and sonicating the mixture. It can be obtained by subjecting to treatment. Alternatively, it can be obtained by chemically covalently binding an antitumor compound to the hydrophobic polymer portion of the block copolymer and causing the resulting fusion molecule to self-associate in an aqueous solvent.
- an organic solvent eg, CHCl 3
- the block copolymer is a polymer in which polymer chains that are incompatible with each other are bonded at the ends.
- block copolymers useful in the present invention include, but are not limited to, polyethylene glycol-poly (glutamic acid) block copolymers, polyethylene glycol-poly (aspartic acid) block copolymers, and the like.
- the antitumor compound contained in the micelle is preferably an insoluble or hardly soluble compound in water. Methods for producing micelles containing antitumor compounds are well known in the art. See, for example, Cancer Research, vol. 66, pp. 10048-10056, 2006, etc. for the production method.
- Liposomes and micelles may be modified in order to improve in vivo stability.
- the substance can be protected from phagocytosis by macrophages or the like by modifying liposomes or micelles with PEG and eliminating the charge.
- the particle size of the liposome and micelle is not particularly limited, but is preferably set so that the complex of the present invention can exhibit the EPR effect.
- the particle size is 100 to 450 nm for liposomes and 10 to 80 nm for micelles.
- the particle diameters of liposomes and micelles mean the median diameter when measured using a dynamic light scattering method using Particle °C Sizer NICOMP 380ZLS (Particle Sizing Systems) in PBS at 25 ° C. To do.
- the substance having a specific binding ability to the stroma component and the antitumor site are directly or indirectly bound.
- the bond is usually a covalent bond.
- “Indirect binding” means binding via a linker.
- the antitumor site is bound to a substance having a specific binding ability to a stroma constituent factor via a linker.
- a linker especially PEG
- the linker means a divalent or higher (preferably divalent) group for linking two compounds.
- the type of linker that can be used in the present invention is not particularly limited, and examples thereof include polyalkylene glycol linkers, alkylene groups, peptides, sugar chains, and other polymer carriers.
- the alkylene part of the alkylene glycol which is a constituent unit of the polyalkylene glycol linker, usually has 1 to 3000 carbon atoms, preferably 2 to 1000 carbon atoms, and more preferably 2 to 100 carbon atoms.
- the molecular weight of the polyalkylene glycol linker is usually 300 to 50,000 Da, preferably 500 to 30,000 Da.
- the polyalkylene glycol linker is preferably a polyethylene glycol linker.
- the alkylene group may be linear or branched.
- the alkylene group usually has 2 to 3500 carbon atoms, preferably 100 to 2000 carbon atoms, and more preferably 500 to 1000 carbon atoms.
- the molecular weight of the linker can be appropriately adjusted by those skilled in the art based on the relationship with the molecular weight of the complex of the present invention described later.
- the linker includes a linear linker (bivalent linker) and a branched linker (trivalent or higher linker).
- the linear linker has a site that binds to a substance having a specific binding ability to a stroma component at one end and a site that binds to an antitumor compound at the other end.
- a branched linker usually has a site that binds to a substance having a specific binding ability to a stroma component at one end thereof, and a branched site is linked to the site, to each branch of the branched part.
- a linear linker (polyalkylene glycol chain, alkylene chain, peptide chain, sugar chain, etc.) is linked, and has a site for binding to the antitumor compound at the end of the linker.
- the bond between the substance having specific binding ability to the stroma and the linker is a covalent bond or a non-covalent bond (ionic bond, hydrophobic bond, etc.), preferably a covalent bond.
- a covalent bond or a non-covalent bond (ionic bond, hydrophobic bond, etc.), preferably a covalent bond.
- bonds include a bond between a maleimide group and a thiol group, a bond obtained by reacting a haloester and a thiol, an amide bond between a carboxyl group and an amino group, a disulfide bond between a thiol group and a thiol group, and an amino group.
- Schiff base by aldehyde group, thioester bond between thiol group and carboxylic acid, ester bond between hydroxyl group and carboxyl group, bond by amino group and squaric acid derivative (for example, dimethyl squaric acid), dienylaldehyde group and amino group it is not limited to these.
- a bond between a maleimide group provided at one end of the linker and a thiol group contained in a cysteine residue in a substance having a specific binding ability to a stroma component Dehydration substitution bond between a succinimide group provided at one end of the linker and an amino group contained in a lysine residue in a substance having specific binding ability to a stroma component (see, for example, WO 2008/096760) ), Dehydration condensation bond with carboxylic acid contained in aspartic acid or glutamic acid in a substance having specific binding ability to an amino group provided at one end of linker and interstitial constituent factor (for example, using WSCDI) And the like.
- a pyridine derivative by a pericyclic reaction between an amino group of a substance having specific binding ability to a stroma component and a dienylaldehyde group provided at one end of the linker.
- a substance having specific binding ability to a stroma component has a cysteine residue at the N-terminus (for example, when a cysteine residue is introduced at the N-terminus by genetic modification)
- the cysteine residue The thioester type linker can be linked to each other via an amide bond (see, for example, Angew. Chem. Int. Ed. Engl. 1997, 36, No. 10, pp. 1069-1071). It is also conceivable to synthesize using intein (protein splicing or protein intron).
- the binding between the substance or linker having a specific binding ability to the interstitial constituent factor and the anti-tumor site is a covalent bond or a non-covalent bond (ionic bond, hydrophobic bond, etc.). is there.
- an anti-tumor compound is used as the anti-tumor site, the binding is difficult to cleave in the blood but is delivered to the tumor stroma when the conjugate of the invention is administered to a tumor patient. It is preferable that the antitumor site can be gradually released from the complex after the complex is bound to the site.
- the bond between the substance or linker having a specific binding ability to the stroma constituent factor and the antitumor site is preferably an ester bond, a carbamate bond, more preferably an ester bond. It is not limited to these. A carbonate bond, a thiocarbamate bond, and the like are also preferable.
- an ester bond it is expected that the bond is hydrolyzed by carboxylesterase in the tumor tissue or non-enzymatically to release the antitumor site in a sustained release manner.
- carbamate binding it is expected that the antibody complex in the cell is endocytosed and then cleaved with intracellular carboxylesterase, and the antitumor site is released slowly.
- a bond between a substance or linker having a specific binding ability to a stroma constituent factor and an antitumor site a bond via hydrazone (dehydrated condensate of carbonyl and hydrazine), a thioester or the like is also preferable. .
- the antitumor compound when a liposome or micelle containing an antitumor compound is used as an antitumor site, the antitumor compound can be released from the liposome or micelle in a sustained manner due to its structure. Therefore, the binding of a substance or linker having a specific binding ability to stroma constituent factors and liposomes or micelles can be performed either in the blood or in the tumor stroma when the complex of the present invention is administered to a tumor patient. It may be a mode that is difficult to cut. Examples of such types of bonds include bonds as described in WO 00/64413.
- linear linkers include the formula:
- the linker is usually linked to a substance having a specific binding ability to a stroma component at a terminal having a succinimidyl group and linked to an antitumor compound at the other terminal.
- linear linkers include the formula:
- the linker is usually linked to a substance having a specific binding ability to a stroma component at a terminal having a succinimidyl group and linked to an antitumor compound at the other terminal.
- branched linkers include the formula:
- the linker is usually linked to a substance having a specific binding ability to a stroma component at a terminal having a succinimidyl group and linked to an antitumor compound at a plurality of other terminals.
- This branched linker is available, for example, from Pierce.
- the number of antitumor compounds that bind to one molecule of a substance having a specific binding ability to a stroma component is theoretically although not particularly limited, the number is usually 1 to 10, preferably 1 to 8, from the viewpoint of the stability and ease of production of the composite.
- the molar ratio of the linker moiety to the antitumor compound moiety in the complex is usually 1: 1, but the antitumor compound may be several moles relative to 1 mol of the linker moiety.
- a functional structure eg, liposome, micelle
- a stroma constituting factor that binds to the functional structure
- the ratio of substances having binding ability is not particularly limited in theory, but Y. Matsumura et al. Phase I and pharmacokinetic study of MCC-465, a doxorubicin from the viewpoint of the stability and ease of production of the complex. (DXR) encapsulated in PEG immunoliposome, in patients with metastatic stomach cancer.Annals of Oncology.2004: 15: 517-525, F. Koizumi et al.
- the molar ratio of the linker moiety in the complex to the functional structure moiety is usually 1: 1, but the functional structure may be several moles relative to 1 mol of the linker moiety.
- Tumor vascularity is enhanced as tumor vascularity, and high-molecular substances that are difficult to leak from normal blood vessels can be easily leaked from tumor blood vessels. It has been reported that an EPR effect (enhanced permeation and retention ⁇ effect) that a macromolecular substance once leaked from a blood vessel in a tumor tissue cannot be drained into a lymphatic vessel and stays in the tumor tissue for a long time due to poor neoplasia.
- the size (molecular weight, etc.) of the complex of the present invention is not particularly limited, but it is preferable to exhibit the EPR effect.
- the range of the molecular weight of the complex capable of exhibiting the EPR effect is, for example, 50,000 Da or more, preferably 70,000 Da or more. If it is, it will not be limited to this.
- the molecular weight is less than 50,000 Da, the molecules are excreted from the kidney into the urine, and the risk that the EPR effect becomes weak increases.
- the molecular weight of the complex of the present invention is usually 200,000 Da or less.
- the molecular weight range of the complex of the present invention is preferably 100 to 180,000 Da, more preferably 120 to 160,000 Da, and further preferably 150,000 Da.
- the molecular weight of a protein exhibiting a favorable and favorable EPR effect is 70,000 to 200,000 Da.
- the particle size of the complex that can exhibit the EPR effect varies depending on the type of the functional structure.
- the particle size of the complex capable of exhibiting the EPR effect is usually 100 to 450 nm.
- the particle size of the composite capable of exhibiting the EPR effect is usually 10 to 80 nm.
- the particle diameter of the composite means the median diameter measured at 25 ° C. in PBS using a dynamic light scattering method using Particle Sizer NICOMP 380ZLS (Particle Sizing Systems). .
- the molecular weight (or particle size) of the substance having specific binding ability to the stroma constituent factor, linker, antitumor compound or functional structure capable of sustained release of the antitumor compound is not particularly limited.
- the molecular weight is preferably set so that the complex of the present invention can exhibit the EPR effect.
- the molecular weight of a substance having specific binding ability to a stroma constituent factor is, for example, 50,000 Da or more, preferably 70,000 Da or more when the substance is a protein, but can exhibit the EPR effect. If it is a thing, it will not be limited to this. When the molecular weight is less than 50,000 Da, the molecules are excreted from the kidney into the urine, and the risk that the EPR effect becomes weak increases.
- F (ab) having a molecular weight of 25,000 Da is easily excreted from the kidney, so that accumulation in the tumor may be limited.
- the molecular weight is too large, there is a high risk that the molecule will be recognized as a foreign substance and phagocytosed by macrophages.
- an IgM antibody having a molecular weight of 900,000 Da is too large to leak from tumor blood vessels, and the network such as the liver. May be easily captured in the internal system.
- the molecular weight of the substance having specific binding ability to the stroma constituent factor is usually 200,000 Da or less.
- the molecular weight of a protein exhibiting a favorable and favorable EPR effect is 70,000 to 200,000 Da (Non-patent Documents 13 and 17). From this point of view, IgG (molecular weight of about 150,000 Da) is preferable as the antibody used in the present invention.
- the complex of the present invention can be produced by binding a substance having specific binding ability to a stroma constituent factor to an antitumor site.
- a linker When a linker is used for binding between the two, it can be produced by binding the linker to an antitumor site and further binding it to a substance having a specific binding ability to a stroma component. . Note that the order in which the parts are combined is not specified in this order.
- SN-38 (10-hydroxy-7-ethylcamptothecin) is used as an antitumor site
- a polyethylene glycol linker is used as a linker
- an antibody is used as a substance having a specific binding ability to a stroma component.
- SN-38 is dehydrated and condensed with a polyethylene glycol having a carboxyl group at one end and an amino group protected by Boc, Fmoc or the like at the other end, and the hydroxyl group of SN-38 Introducing a polyethylene glycol linker.
- a polyethylene glycol having a succinimide group at one end and a maleimide group at the other end is mixed with the product of (I), and the succinimide group and the amino group of the product of (I) are mixed.
- a maleimide group into the polyethylene glycol linker.
- the complex of the present invention has a feature that it binds to the stroma in the tumor tissue, stays in the tumor tissue for a long period of time, and continues to exert an antitumor effect for a long period of time. Therefore, an effective amount of the complex of the present invention is sucked.
- a tumor in the mammal can be prevented or treated.
- the complex of the present invention can also exert an anti-tumor effect for a long period of time by inhibiting the formation of blood vessels that remain in the tumor tissue for a long period of time and nourish the tumor in the border region of the tumor. Therefore, the present invention provides a preventive or therapeutic agent for tumors and a tumor vascular inhibitor (hereinafter also referred to as the agent of the present invention) comprising the complex of the present invention.
- the type of tumor is not particularly limited, but is a solid cancer, preferably a solid cancer having a stroma, from the viewpoint of maximizing the above characteristics.
- Types of solid cancer include osteosarcoma, esophageal cancer, lung cancer, liver cancer, gastric cancer, pancreatic cancer, colon cancer, rectal cancer, colon cancer, ureteral tumor, brain tumor, gallbladder cancer, bile duct cancer, biliary tract cancer, renal cancer, breast cancer , Bladder cancer, ovarian cancer, cervical cancer, prostate cancer, thyroid cancer, testicular tumor, Kaposi sarcoma, maxillary cancer, tongue cancer, lip cancer, oral cancer, pharyngeal cancer, laryngeal cancer, muscle tumor, skin cancer, etc.
- the complex of the present invention is useful for the prevention and treatment of tumors with many stroma (for example, intractable cancers such as pancreatic cancer, gastric cancer (skilled gastric cancer), colon cancer and lung cancer), and the inhibition of blood vessel formation that nourishes the tumor. It is advantageous.
- the agent of the present invention can be applied to any mammalian tumor.
- mammals include laboratory animals such as rodents and rabbits such as mice, rats, hamsters and guinea pigs, domestic animals such as pigs, cows, goats, horses, sheep and minks, pets such as dogs and cats, humans, Primates such as monkeys, rhesus monkeys, marmosets, orangutans and chimpanzees.
- rodents and rabbits such as mice, rats, hamsters and guinea pigs
- domestic animals such as pigs, cows, goats, horses, sheep and minks
- pets such as dogs and cats
- humans Primates such as monkeys, rhesus monkeys, marmosets, orangutans and chimpanzees.
- primate tumor tissues such as humans are generally richer in stroma, so that the agent of the present invention is effective for primates, particularly human tumors. It is advantageous for prevention or treatment and inhibition of
- the agent of the present invention may be used alone or as a pharmacologically acceptable carrier, flavoring agent, excipient, preservative, suspending agent, solvent, solubilizing agent, tonicity agent, swelling agent, disintegrating agent, It can be formulated according to conventional means together with additives such as lubricants, sweeteners, binders, etc., and used as an oral preparation or parenteral preparation.
- binders gelatin, corn starch, tragacanth, gum arabic, pregelatinized starch, sucrose, methylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, sucrose, D-mannitol, trehalose, dextrin, pullulan, hydroxypropylcellulose, hydroxy Examples thereof include propylmethylcellulose and polyvinylpyrrolidone.
- excipients include lactose, sucrose, D-mannitol, D-sorbitol, starch, pregelatinized starch, dextrin, crystalline cellulose, low-substituted hydroxypropylcellulose, sodium carboxymethylcellulose, gum arabic, pullulan, soft silicic acid,
- excipients include synthetic aluminum silicate, magnesium aluminate metasilicate, xylitol, sorbitol, and erythritol.
- the lubricant include magnesium stearate, calcium stearate, talc, colloidal silica, polyethylene glycol and the like.
- sweetening agent examples include saccharin sodium, dipotassium glycyrrhizinate, aspartame, stevia and the like.
- Flavoring agents include peppermint, red oil or cherry.
- preservative examples include p-hydroxybenzoates, chlorobutanol, benzyl alcohol, phenethyl alcohol, dehydroacetic acid, and sorbic acid.
- disintegrant examples include lactose, sucrose, starch, carboxymethyl cellulose, carboxymethyl cellulose calcium, croscarmellose sodium, carboxymethyl starch sodium, low-substituted hydroxypropyl cellulose, soft anhydrous silicic acid, calcium carbonate and the like.
- suspending agent examples include surfactants such as stearyltriethanolamine, sodium lauryl sulfate, laurylaminopropionic acid, lecithin, benzalkonium chloride, benzethonium chloride, and glyceryl monostearate; for example, polyvinyl alcohol, polyvinylpyrrolidone , Hydrophilic polymers such as sodium carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose; polysorbates, polyoxyethylene hydrogenated castor oil, and the like.
- surfactants such as stearyltriethanolamine, sodium lauryl sulfate, laurylaminopropionic acid, lecithin, benzalkonium chloride, benzethonium chloride, and glyceryl monostearate
- polyvinyl alcohol polyvinylpyrrolidone
- Hydrophilic polymers such as sodium carboxymethylcellulose, methylcellulose, hydroxymethylcellulose,
- the solvent include water for injection, physiological saline, Ringer's solution, alcohol, propylene glycol, polyethylene glycol, sesame oil, corn oil, olive oil, cottonseed oil and the like.
- the solubilizer include polyethylene glycol, propylene glycol, D-mannitol, trehalose, benzyl benzoate, ethanol, trisaminomethane, cholesterol, triethanolamine, sodium carbonate, sodium citrate, sodium salicylate, sodium acetate.
- the isotonic agent include sodium chloride, glycerin, D-mannitol, D-sorbitol, glucose, xylitol, fructose and the like.
- a buffer examples include buffer solutions such as phosphate, acetate, carbonate, and citrate.
- soothing agents include propylene glycol, lidocaine hydrochloride, benzyl alcohol, benzalkonium chloride, procaine hydrochloride and the like.
- the stabilizer examples include human serum albumin and polyethylene glycol.
- preservatives include benzyl alcohol and phenol.
- the antioxidant include sulfite and ascorbate.
- Suitable examples of the colorant include water-soluble colored tar dyes (eg, edible dyes such as edible red Nos. 2 and 3, edible yellows 4 and 5, edible blue Nos. 1 and 2), insoluble lake dyes ( Examples include aluminum salts of the aforementioned water-soluble edible tar pigments, natural pigments (eg, ⁇ -carotene, chlorophyll, bengara) and the like.
- water-soluble colored tar dyes eg, edible dyes such as edible red Nos. 2 and 3, edible yellows 4 and 5, edible blue Nos. 1 and 2
- insoluble lake dyes examples include aluminum salts of the aforementioned water-soluble edible tar pigments, natural pigments (eg, ⁇ -carotene, chlorophyll, bengara) and the like.
- an administration route that is most effective for treatment can be administered as an oral preparation, an injection, or a transdermal preparation.
- oral preparations include tablets (including sublingual tablets and orally disintegrating agents), capsules (including soft capsules and microcapsules), powders, granules, troches, syrups, emulsions, suspensions, and the like.
- the injection include intradermal injection, subcutaneous injection, intravenous injection, intramuscular injection, intrathecal injection, epidural injection, and local injection.
- transdermal preparations include patches, ointments, and sprays. These preparations may be controlled-release preparations (eg, sustained-release microcapsules) such as immediate-release preparations or sustained-release preparations.
- the agent of the present invention is preferably formulated as an injection.
- Sterile compositions for injections may be formulated according to normal pharmaceutical practice, such as dissolving or suspending the active substance in a vehicle (aqueous solution for injection; naturally occurring vegetable oils such as sesame oil, coconut oil, etc.). it can.
- aqueous solution for injection for example, isotonic solution (eg, D-sorbitol, D-mannitol, sodium chloride, etc.) containing physiological saline, glucose and other adjuvants, etc. are used.
- alcohol eg ethanol
- polyalcohol eg propylene glycol, polyethylene glycol
- nonionic surfactant eg polysorbate 80 TM , HCO-50
- oily liquid for example, sesame oil, soybean oil and the like are used, and they may be used in combination with solubilizing agents such as benzyl benzoate and benzyl alcohol.
- solubilizing agents such as benzyl benzoate and benzyl alcohol.
- the injection can be sealed in a container in unit doses or multiple doses like ampoules and vials.
- the active ingredient and a pharmaceutically acceptable carrier can be lyophilized and stored in a state that may be dissolved or suspended in a suitable sterile vehicle immediately before use.
- the content of the complex of the present invention in the agent of the present invention varies depending on the form of the preparation, but is usually about 0.1 to 99.9% by weight, preferably about 1 to 99% by weight, based on the whole preparation, More preferably, it is about 10 to 90% by weight.
- the dose of the agent of the present invention can be appropriately determined in consideration of the type of administration target, the method of administration, the type of antitumor agent, the type of tumor cell, the site, etc., but is administered intravenously to human solid cancer Is preferably 5 to 500 mg, more preferably 10 to 500 mg, and even more preferably 10 to 300 mg as the amount of the complex of the present invention per kg body weight. These effective amounts can be administered once or in several divided doses.
- the present invention provides a complex comprising a substance having a specific binding ability to a stroma constituent factor and a labeled compound bound to the substance via a linker.
- labeling compounds include, but are not limited to, radioisotopes, fluorescent substances, enzymes, and the like.
- radioactive isotopes such as 3 H, 14 C, 125 I and 131 I, green fluorescent protein (GFP), fluorescent substances such as fluorescein isothiocyanate, tetramethylrhodamine isothiocyanate and Eu 3+ , methylcoumarin series
- fluorescent substances such as fluorescein isothiocyanate, tetramethylrhodamine isothiocyanate and Eu 3+
- the labeled compound include compounds, peroxidase, alkaline phosphatase, ⁇ -D-galactosidase, glucose oxidase, glucose-6-phosphate dehydrogenation and the like.
- enzyme labels chemical conversion of the detectable substrate compound or composition may be catalyzed.
- the definition of a substance and a linker having a specific binding ability to the stroma component is as described above.
- the binding mode between the substance having specific binding ability to the stroma and the linker is as described above, and the linker and the labeled compound are appropriately determined according to the binding mode between the linker and the antitumor compound. can do.
- the particle size of the complex, the entire complex, and the molecular weight of the substance, linker, and labeling compound that have specific binding ability to the constituent elements of the stroma are as described above.
- the complex of the present invention can be obtained according to the above-described production method. Since the complex can remain in the stromal part of the tumor tissue for a long time, it can be used as a diagnostic agent for the presence or absence of tumor, size, imaging, etc. as it is or by formulating with the additives described below.
- the present invention also provides a method for diagnosing a tumor, comprising using the complex in a subject.
- the content of the complex of the present invention in the diagnostic agent varies depending on the form of the preparation, but can be determined according to the content of the complex of the present invention in the therapeutic agent.
- the usage-amount of the diagnostic agent of this invention can also be determined according to the dosage of the said therapeutic agent. These can be used once or divided into several times.
- stromal collagen in tumors produced by human pancreatic cancer strain PSN1 or SUIT2 subcutaneously transplanted into nude mice EpCAM as mouse anti-human EpCAM antibody (B8-4, created by National Cancer Center) and anti-mouse Alexa488-labeled secondary antibody (Invitrogen), collagen type 4 with rat anti-mouse collagen 4 antibody (1-4, prepared by National Cancer Center) and anti-rat Alexa555-labeled secondary antibody (Invitrogen), and cell nucleus with 3 DAPI (Invitrogen) Double staining was performed, and observation was performed by photographing with a fluorescence microscope BZ9000 (Keyence). Abundant collagen was found in the stroma, although not as much as human pancreatic cancer. In addition, more interstitial collagen was observed in SUIT2 than in PSN1.
- the expression of EpCAM was measured for PSN1 and SUIT2 in a pancreatic cancer cell line using a flow cytometer.
- mouse anti-human EpCAM antibody (B8-4) is used as the primary antibody for each cell line
- APC-labeled anti-mouse antibody (Beckton Dickinson and Company) is used as the secondary antibody, and PI for the removal of dead cells is further removed.
- Propidium Iodide, Invitrogen was used for co-staining and then measured with a flow cytometer FACS Caribur (Beckton Dickinson and Company). The analysis was performed with analysis software Flowjo (Tree Star). The results are shown in FIG. From this result, it is clear that the human pancreatic cancer line SUIT2 is an EpCAM (Epithelial Cell Adhesion Molecule) positive cell.
- CD20 is an anti-human CD20 antibody
- EpCAM is an anti-human EpCAM antibody
- Col. 4 shows an anti-mouse type IV collagen antibody.
- the anti-human CD20 antibody did not cause an antigen-antibody reaction, but selectively accumulated in the tumor tissue due to the EPR effect. However, it disappeared from the tumor tissue earlier than the anti-mouse type IV collagen antibody. Although it was observed that anti-human EpCAM antibody was also accumulated in the tumor tissue, it disappeared earlier than the anti-mouse type IV collagen antibody, despite being SUIT2 tumor specific.
- the anti-mouse type IV collagen antibody accumulated in the tumor tissue for a longer period of time than the other two antibodies despite the presence of mouse type IV collagen, which is a neutralizing antigen, in the mouse blood. It was shown that the nature is high.
- Anti-human EpCAM antibody (B8-4), anti-mouse type IV collagen antibody (35-4), anti-human CD20 antibody (Rituximab, Chugai Pharmaceutical) created at the National Cancer Center was adjusted so that each antibody had a concentration of 1.0 mg / ml in PBS.
- DTT dithiothreitol
- the protein mass was measured by the Bradford method (Bio-Rad Protein Assay, 500-0006JA, Bio-Rad).
- the recovery rate of the protein was 51% for the EpCAM antibody, 77% for the CD20 antibody, and 51% for the 35-4 antibody, and 8.4 EpCAM antibodies and 6.7 CD20 antibodies per antibody.
- 7.2 SN-38 was added to the anti-collagen antibody. The calculation was also performed by the DNTB method. A schematic diagram of the resulting composite is shown in FIG.
- Example 2 In vitro cell killing effect
- the anti-human CD20 antibody-SN-38 complex, anti-human EpCAM antibody-SN-38 antibody and anti-mouse type IV collagen antibody-SN-38 complex prepared in Example 1 were produced in vitro.
- the cell killing effect was compared to free SN-38 and CPT-11.
- 3,000 PSN1 or SUIT2 cancer cells were seeded in a 96-well cell plate, each complex was added 24 hours later, and the number of cells 48 hours later was determined by the WST-8 method using Cell Counting Kit-8 (Dojindo). It was measured. The results are shown in FIG.
- anti-tumor effects of anti-human CD20 antibody-SN-38 complex, anti-human EpCAM antibody-SN-38 antibody and anti-mouse type IV collagen antibody-SN-38 complex were attenuated compared to free SN-38.
- the antitumor effect exceeding CPT-11 was maintained. There was no difference in anti-tumor effect between the three complexes.
- Example 3 In vivo anti-tumor effect When PSN1 or SUIT2 is implanted subcutaneously into nude mice and the tumor diameter reaches 6 mm, anti-human CD20 antibody-SN-38 complex, anti-human EpCAM antibody-SN-38 antibody or anti-mouse IV Type collagen antibody-SN-38 complex was administered intravenously (3 mg / kg each in terms of SN-38), and the size of the tumor mass was monitored. The results are shown in FIG. In vitro, there was no difference in antitumor effect among the three conjugates, but in vivo, anti-mouse type IV collagen antibody-SN-38 conjugate showed the highest antitumor effect.
- Example 4 Action on tumor cells and tumor blood vessels
- SUIT2 When SUIT2 is implanted subcutaneously into nude mice and the tumor diameter reaches 6 mm, anti-mouse type IV collagen antibody-SN-38 complex is administered intravenously (in terms of SN-38). Histopathological features were monitored for each 3 mg / kg). Details are shown below.
- Hybridomas producing anti-EpCAM antibodies (clone B8-4) were obtained from mice immunized with recombinant proteins (R & D Systems, Minneapolis, MN, USA). Hybridomas producing anti-collagen IV antibody (clone 35-4) were obtained from rats immunized with purified protein. Spleen cells obtained from immunized mice were fused with myeloma cells (P3X63Ag8.653). Recombinant proteins that bind to specific antibodies producing hybridoma clones were selected using ELISA. Anti-human CD20 antibody (rituximab) was purchased from Daiichi Sankyo (Tokyo, Japan).
- polyclonal anti-collagen IV antibody LSL-LB-1403
- monoclonal anti-CD31 antibody MEC13.3
- SN-38 and CPT-11 Irinotecan were purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan) and Yakult (Tokyo, Japan), respectively.
- PSN1 Human pancreatic cancer cell line PSN1 was purchased from American Type Culture Collection (Rockville, MD, USA). SUIT2 was provided by Dr. Oku (Shizuoka University, Shizuoka, Japan). Both cell lines were 5% CO 2 atmosphere in DMEM (Sigma, St. Louis, MO, USA) supplemented with 10% fetal bovine serum (Tissue Culture Biologicals, CA, USA), penicillin, streptomycin and amphotericin B (Sigma). Maintained under 37 ° C.
- Linker-SN-38 complex Prepared in the same manner as in Example 1, and the concentration of antibody-prodrug complex was determined using the Bradford method (Bio-Rad Protein Assay, 500-0006JA, Bio-Rad Laboratories, Inc.). ). The number of thiol residues was quantified with DNTPs. The ratio of each drug (SN-38) / antibody was determined by comparing the number of free thiols and thiol residues (range 6.7-8.4).
- the cells were incubated with Alexa 488-labeled anti-mouse IgG (Invitrogen) and Alexa 555-labeled anti-rat IgG (Invitrogen) as secondary antibodies for 60 minutes at room temperature. After washing 3 times with PBS, it was incubated with PBS containing DAPI (Invitrogen). Alexa 555 labeled anti-rat IgG (Invitrogen) or anti-human IgG (Invitrogen) was used to detect the antibody prodrug SN-38 injected into the tumor. The tissue was covered with a coverslip in the mounting solution (Vector Laboratory). Fluorescent images were obtained using a digital high-definition microscopic SYSTEM BZ-9000 (Keyence Corporation, Osaka, Japan) or a laser scanning microscope system LSM 710 (Carl Zeiss).
- mice Female BALB / c nude mice (5 weeks old) were purchased from SLC Japan (Shizuoka, Japan). Mice were inoculated subcutaneously with 2 ⁇ 10 6 cells on the flank. Tumor size (length (L) and width (W)) was measured every 4 days and tumor volume was calculated using (L ⁇ W 2 ) / 2. All animal treatments were conducted in accordance with guidelines for the management and use of laboratory animals established by the National Cancer Center Animal Experiment Committee. These guidelines meet the legally required ethical standards and meet the guidelines for the use of laboratory animals in Japan. When the mean tumor volume was about 90 mm 3 (PSN1) or about 70 mm 3 (SUIT2), the mice were randomly divided into 4 groups of 5 animals each. The immunoconjugate was administered on the day of tail vein injection. An injection dose of antibody-SN-38 prodrug equal to the SN-38 dose was determined by calculation based on the ratio of each drug (SN-38) / antibody.
- A, C, E, and G are tumors to which no complex was administered, and B, D, F, and H represent tumors 3 months after administration of the complex.
- a to D are SUIT2 tumors stained with hematoxylin and eosin, and the part surrounded by a dotted line with B contains living cells.
- the part between D indicated by the tip of the black triangle indicates the width of the formed fibrous coating.
- Tumor growth was examined using Ki67 immunochemical staining and is shown in E and F.
- G and H tumor blood vessels and their traces were examined by double staining of CD31 and collagen IV. The main positive part is surrounded by a dotted line.
- a substance for example, an antibody collagen IV antibody
- a specific binding ability to a constituent factor of the tumor stroma rather than the case where an antitumor compound is administered without using a targeting substance, and binds to it. It was suggested that a higher antitumor effect can be achieved in vivo when a complex containing the prepared antitumor compound is administered.
- a complex containing a substance having a specific binding ability to a constituent factor of tumor stroma for example, antibody collagen IV antibody
- an antitumor compound bound thereto the tumor is separated in the border region of the tumor. It was shown that the formation of blood vessels that nourishes was suppressed.
- the flask was washed twice with DMF (3 mL). The mixture was stirred at 55 ° C. for 1 hour. After cooling to room temperature, N, N-dimethyl 1,3-propanediamine (10 mL) was added. After 1 hour, the mixture was diluted with saturated NH 4 Cl and EtOAc. The aqueous layer was extracted with EtOAc. The mixed layer was washed with saturated brine. The organic layer was dried over Na 2 SO 4 and filtered. After evaporation, the residue was purified on a silica gel column (hexane: EtOAc 9: 1-4: 1) to give the ether compound of the above formula (8.60 g, 58%) as a colorless oil.
- Example 1 The Boc compound of SN38-PEG obtained in step (0.52 g, 0.270 mmol) was dissolved in CH 2 Cl 2 (20 mL), TFA (2 mL) was added, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was concentrated under reduced pressure, toluene was added, and the mixture was further concentrated and dried under vacuum. This residue was dissolved in CH 2 Cl 2 (20 mL), iPr 2 NEt (0.57 mmol, 3.24 mmol) was added at 0 ° C., anhydrous succinimide (30 mg, 0.297 mmol) was added, and the mixture was stirred at room temperature overnight. did.
- the reaction solution was purified by LH20 (CHCl 3 : MeOH 1: 1) and silica gel column chromatography (CHCl 3 : MeOH 9: 1-4: 1). Meanwhile, triphenylphosphine (105 mg, 0.40 mmol) was added to a solution of triazide (63 mg, 0.10 mmol) synthesized in Step 7 in dioxane (1 mL) and water (1 mL), and the mixture was stirred overnight at room temperature under a nitrogen atmosphere. did. The reaction solution was concentrated, and the above carboxylic acid was dissolved in CH 2 Cl 2 (10 mL) and HOBt (54 mg, 0.4 mmol) and WSCDI (76 mg, 0.40 mmol) were added thereto.
- reaction solution was stirred overnight at room temperature, and the reaction solution was purified by LH20 (CHCl 3 : MeOH 1: 1) and silica gel column chromatography (CHCl 3 : MeOH 9: 1-4: 1), and 0.22 g was purified. Obtained. This was dissolved in CH 2 Cl 2 (4.5 mL) and TFA (0.5 mL), stirred for 1 hour at room temperature, and then concentrated under reduced pressure. This was dissolved in CH 2 Cl 2 (1 mL), iPr 2 NEt (0.1 mL) was added, and N-succimidyl 3-Maleimidopropionate (13 mg, 0.470 mmol) was added.
- Hybridoma clones 35-4 that produce anti-collagen type IV antibodies (rat anti-mouse collagen type IV antibody IgG2a), 6-1 (mouse anti-human collagen type IV antibody IgM), 6-2 (mouse anti-human collagen type IV antibody IgM) ) And 56P-1 (mouse anti-human collagen type IV antibody IgM), the VL and VH sites of the antibody were cloned, and the nucleotide sequence was determined.
- the nucleotide sequence of the VH site of heavy chain G2a obtained from hybridoma clone 35-4 is shown in SEQ ID NO: 1.
- the result of the alignment with the corresponding cDNA sequence (SEQ ID NO: 9) of rIgG2a clone BC088240.1 is shown in FIG.
- the amino acid sequence deduced from the base sequence of the VH site of heavy chain G2a obtained from hybridoma clone 35-4 is shown in SEQ ID NO: 12.
- the result of alignment with the corresponding amino acid sequence (SEQ ID NO: 20) of rIgG2a clone BC088240.1 is shown in FIG.
- the nucleotide sequences of the VH sites of heavy chain Mu obtained from hybridoma clones 6-1, 6-2 and 56P-1 are shown in SEQ ID NOs: 3, 5 and 7, respectively.
- the results of alignment of IgM variable region clone J00529.1 and IgM constant region clone V00827.1 with the corresponding cDNA sequences (SEQ ID NO: 10) are shown in FIG.
- the amino acid sequences deduced from the base sequence of the VH site of heavy chain Mu obtained from hybridoma clones 6-1, 6-2 and 56P-1 are shown in SEQ ID NOs: 14, 16 and 18, respectively.
- FIG. 11 shows the result of alignment with the corresponding amino acid sequence (SEQ ID NO: 21) of IgM variable region clone J00529.1 and IgM constant region clone V00827.1.
- the nucleotide sequences of the VL sites of the kappa chain obtained from the hybridoma clones 35-4, 6-1, 6-2 and 56P-1 are shown in SEQ ID NOs: 2, 4, 6 and 8, respectively.
- the result of alignment with the corresponding cDNA sequence (SEQ ID NO: 11) of the kappa chain clone BC088255.1 is shown in FIG.
- the amino acid sequences deduced from the nucleotide sequence of the VL site of the kappa chain obtained from the hybridoma clones 35-4, 6-1, 6-2 and 56P-1 are shown in SEQ ID NOs: 13, 15, 17 and 19, respectively.
- the result of alignment with the corresponding amino acid sequence (SEQ ID NO: 22) of the kappa chain clone BC088255.1 is shown in FIG.
- VL and VH are usually about 110 amino acids, and the lengths of the sequences cloned by the 5′-RACE method are about the same, so that the full-length cDNA sequences of VL and VH are It is thought that it was obtained.
- this obtained sequence it is possible to design and prepare a chimeric antibody or a humanized antibody by a conventional method.
- Example 6 Manufacture of anti-fibrin antibody-SN-38 complex (embodiment of ester bond) Human fibrinogen was converted to fibrin, and a mouse was immunized with human fibrin to obtain a monoclonal antibody that specifically recognizes human fibrin. This antibody also cross-reacted with mouse fibrin. The cDNA sequence of the variable portion of this antibody was clarified, and a chimeric antibody containing the variable region and human Fc portion was prepared. In the same manner as in Example 1, an anti-fibrin antibody-SN-38 complex was produced. In the complex obtained here, SN-38 is bonded to the linker via an ester bond. A schematic diagram of the resulting composite is shown below.
- the Boc compound (52.0 mg, 0.084 mmol) was dissolved in CH 2 Cl 2 -TFA (1:10, 1.1 mL) and stirred at room temperature for 3 hours. Toluene (50 mL) The reaction solution was concentrated. Methylene chloride (2 mL) was added to the residue, and i-Pr 2 NEt (0.3 mL) and PEG-succimide (200 mg) were added at 0 ° C. After stirring at room temperature for 3 hours, the reaction solution was purified by LH20 (MeOH: CHCl 3 1: 1) and silica gel column chromatography (CHCl 3 : MeOH 10: 1) to obtain 111.9 mg (69%) of the PEG adduct. Obtained.
- the Boc form (330 mg, 0.171 mmol) was dissolved in methylene chloride (4 mL), TFA (0.4 mL) was added, and the mixture was stirred for 2 hr. Toluene (50 mL) was added and the reaction was concentrated. The residue was dissolved in methylene chloride (4 mL), and i-Pr 2 NEt (0.15 mL, 0.884 mmol) and MAL-PEG 12 -succimide (148 mg, 0.171 mmol) were added at 0 ° C.
- Example 8 In vivo anti-tumor effect
- Fib-E anti-fibrin antibody-SN-38 complex obtained in Example 6
- Fib-N The anti-fibrin antibody-SN-38 complex obtained in Example 7
- physiological saline control
- the size of the tumor diameter on the day was monitored. The results are shown in FIG. All anti-fibrin antibody-SN-38 conjugates showed a high anti-tumor effect, but Fib-E showed a higher anti-tumor effect than Fib-N.
- a complex that stays in the tumor stroma for a long time and exhibits an excellent antitumor effect.
- the antitumor effect of an antitumor compound having a time-dependent antitumor effect can be effectively exhibited.
- it since it acts on tumor blood vessels and / or tumor cells, it can be expected to have a significantly higher antitumor effect than conventional complexes.
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Abstract
Description
(1)モノクローナル抗体の適用は、特異的抗原が腫瘍細胞の膜表面に発現している腫瘍に限られること、
(2)モノクローナル抗体が、血中に遊離している抗原で中和されて肝心の腫瘍局所までデリバリーできない可能性があること、
(3)モノクローナル抗体を腫瘍局所へデリバリーできたとしても、腫瘍血管から漏出後、腫瘍血管から腫瘍細胞に到達するまでに間質が障壁となって肝心の腫瘍細胞のところまでにモノクローナル抗体が到達できない可能性があること、等が挙げられる。
[1]間質の構成因子に対して特異的結合能を有する物質及び該物質へ結合した抗腫瘍性部位を含む複合体。
[2]間質の構成因子に対して特異的結合能を有する物質と抗腫瘍性部位とがリンカーを介して結合している、[1]記載の複合体。
[3]抗腫瘍性部位が抗腫瘍性化合物である、[1]記載の複合体。
[4]抗腫瘍性部位が抗腫瘍性化合物を徐放できる機能性構造である、[1]記載の複合体。
[5]抗腫瘍性化合物を徐放できる機能性構造が、抗腫瘍性化合物を含有するリポソーム又はミセルである、[4]記載の複合体。
[6]間質の構成因子に対して特異的結合能を有する物質が、間質の構成因子に対して特異的結合能を有する抗体又はその結合性断片である、[1]記載の複合体。
[7]間質の構成因子がコラーゲンである、[1]記載の複合体。
[8]コラーゲンがIV型コラーゲンである、[7]記載の複合体。
[9]間質の構成因子がフィブリンである、[1]記載の複合体。
[10]リンカーと抗腫瘍性部位とが、エステル結合又はカルバメート結合を介して結合している、[2]記載の複合体。
[11]リンカーと抗腫瘍性部位とが、カーボネート結合又はチオカルバメート結合を介して結合している、[2]記載の複合体。
[12][1]記載の複合体を含む、腫瘍の治療剤。
[13][1]記載の複合体を含む、腫瘍血管形成阻害剤。
[14]哺乳動物に対して有効量の[1]記載の複合体を投与することを含む、該哺乳動物における腫瘍の治療方法。
[15]哺乳動物に対して有効量の[1]記載の複合体を投与することを含む、該哺乳動物における腫瘍血管の形成を阻害する方法。
[16]腫瘍の治療において使用するための、[1]記載の複合体。
[17]腫瘍血管の形成阻害において使用するための、[1]記載の複合体。
例えば、間質コラーゲンを市販のアジュバントと共にマウスに2~4回皮下あるいは腹腔内に投与し、最終投与の約3日後に脾臓あるいはリンパ節を採取し、白血球を採取する。この白血球と骨髄腫細胞(例えば、NS-1、P3X63Ag8など)を細胞融合して間質コラーゲンに対するモノクローナル抗体を産生するハイブリドーマを得る。細胞融合はPEG(ポリエチレングリコール)法[J. Immunol. Methods, 81(2): 223-228 (1985)]でも電圧パルス法[Hybridoma, 7(6): 627-633 (1988)]であってもよい。所望のモノクローナル抗体を産生するハイブリドーマは、周知のEIA又はRIA法等を用いて抗原と特異的に結合する抗体を、培養上清中から検出することにより選択できる。モノクローナル抗体を産生するハイブリドーマの培養は、インビトロ、又はマウスもしくはラット、好ましくはマウス腹水中等のインビボで行うことができ、抗体はそれぞれハイブリドーマの培養上清及び動物の腹水から取得することができる。
リンカーの分子量は、後述する本発明の複合体の分子量との関係等に基づいて、当業者であれば適宜調整することができる。
また、複合体中のリンカー部分と抗腫瘍性化合物部分とのモル比は、通常1:1であるが、リンカー部分1モルに対して抗腫瘍性化合物が数モルであっても良い。
また、複合体中のリンカー部分と該機能性構造部分とのモル比は、通常1:1であるが、リンカー部分1モルに対して該機能性構造が数モルであっても良い。
賦形剤としては、乳糖、白糖、D-マンニトール、D-ソルビトール、デンプン、α化デンプン、デキストリン、結晶セルロース、低置換度ヒドロキシプロピルセルロース、カルボキシメチルセルロースナトリウム、アラビアゴム、プルラン、軟質無水ケイ酸、合成ケイ酸アルミニウム、メタケイ酸アルミン酸マグネシウム、キシリトール、ソルビトール、エリスリトールなどが挙げられる。
潤滑剤としては、ステアリン酸マグネシウム、ステアリン酸カルシウム、タルク、コロイドシリカ、ポリエチレングリコールなどが挙げられる。
甘味剤としては、サッカリンナトリウム、グリチルリチン酸二カリウム、アスパルテーム、ステビアなどが挙げられる。
香味剤としては、ペパーミント、アカモノ油又はチェリーが挙げられる。
防腐剤としては、パラオキシ安息香酸エステル類、クロロブタノール、ベンジルアルコール、フェネチルアルコール、デヒドロ酢酸、ソルビン酸が挙げられる。
崩壊剤としては、乳糖、白糖、デンプン、カルボキシメチルセルロース、カルボキシメチルセルロースカルシウム、クロスカルメロースナトリウム、カルボキシメチルスターチナトリウム、低置換ヒドロキシプロピルセルロース、軟質無水ケイ酸、炭酸カルシウムなどが挙げられる。
懸濁化剤としては、例えば、ステアリルトリエタノールアミン、ラウリル硫酸ナトリウム、ラウリルアミノプロピオン酸、レシチン、塩化ベンザルコニウム、塩化ベンゼトニウム、モノステアリン酸グリセリンなどの界面活性剤;例えば、ポリビニルアルコール、ポリビニルピロリドン、カルボキシメチルセルロースナトリウム、メチルセルロース、ヒドロキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロースなどの親水性高分子;ポリソルベート類、ポリオキシエチレン硬化ヒマシ油などが挙げられる。
溶剤の好適な例としては、注射用水、生理食塩水、リンゲル液、アルコール、プロピレングリコール、ポリエチレングリコール、ゴマ油、トウモロコシ油、オリーブ油、綿実油などが挙げられる。
溶解補助剤の好適な例としては、ポリエチレングリコール、プロピレングリコール、D-マンニトール、トレハロース、安息香酸ベンジル、エタノール、トリスアミノメタン、コレステロール、トリエタノールアミン、炭酸ナトリウム、クエン酸ナトリウム、サリチル酸ナトリウム、酢酸ナトリウムなどが挙げられる。
等張化剤の好適な例としては、塩化ナトリウム、グリセリン、D-マンニトール、D-ソルビトール、ブドウ糖、キシリトール、果糖などが挙げられる。
緩衝剤としては、リン酸塩、酢酸塩、炭酸塩、クエン酸塩などの緩衝液などが挙げられる。
無痛化剤としては、プロピレングリコール、塩酸リドカイン、ベンジルアルコール、塩化ベンザルコニウム、塩酸プロカインなどが挙げられる。
安定化剤としては、ヒト血清アルブミン、ポリエチレングリコールなどが挙げられる。
保存剤としては、ベンジルアルコール、フェノールなどが挙げられる。
酸化防止剤としては、亜硫酸塩、アスコルビン酸塩などが挙げられる。
着色剤の好適な例としては、水溶性着色タール色素(例、食用赤色2号及び3号、食用黄色4号及び5号、食用青色1号及び2号などの食用色素)、不溶性レーキ色素(例、前記水溶性食用タール色素のアルミニウム塩)、天然色素(例、β-カロチン、クロロフィル、ベンガラ)などが挙げられる。
標識化合物としては、放射性同位体、蛍光物質又は酵素などが挙げられるがそれらに限定されない。
具体的には、3H、14C、125Iや131I等の放射性同位体、緑色蛍光タンパク質(GFP)、フルオロセインイソチオシアネート、テトラメチルローダミンイソチオシアネートやEu3+等の蛍光物質、メチルクマリン系化合物、ペルオキシダーゼ、アルカリホスファターゼ、β-D-ガラクトシダーゼ、グルコースオキシダーゼ、グルコース-6-リン酸脱水素等のような酵素が標識化合物として挙げられる。
酵素標識の場合には、検出可能な基質化合物又は組成物の化学的変換を触媒してもよい。
前記間質の構成因子に対して特異的結合能を有する物質、リンカーの定義は前述の通りである。
また、間質の構成因子に対して特異的結合能を有する物質とリンカーの結合様式は前述の通りであり、リンカーと標識化合物は前述のリンカーと抗腫瘍性化合物の結合様式に準じて適宜決定することができる。
複合体の粒子径、複合体全体、間質の構成因子に対して特異的結合能を有する物質、リンカー、標識化合物の分子量も前述の通りである。
本発明の複合体は前述の製造方法に準じて得ることができる。
該複合体は、長時間腫瘍組織の間質部分に留まることができるため、そのまま、あるいは後記添加剤と共に製剤化して、腫瘍の有無、サイズ、イメージング等の診断薬として使用することができる。
本発明はまた、前記複合体を対象に使用することを含む、腫瘍の診断方法を提供する。
ヒト膵癌の手術標本を図1に示す。腫瘍血管は乏しく、腫瘍組織塊の中に一部腫瘍細胞が存在するだけで、血管周囲はコラーゲンを含めた間質で充満されていた。
抗体の生体イメージング
ヒトB細胞に対するモノクローナル抗体である抗ヒトCD20抗体(ヒト膵癌株SUIT2とは反応しない抗体、Rituximab、中外製薬)をコントロールとして用い、抗ヒトEpCAM抗体(B8-4)、抗マウスIV型コラーゲン抗体(35-4)の腫瘍集積性を検討した。
BALB/cヌードマウス(メス、6週齢)背部にPSN1又はSUIT2を移植し、移植10日後に各抗体(IRDye800(Li-Cor)により標識化)をマウス尾静脈より投与した。投与1日後、3日後、7日後、14日後の抗体の分布を生体イメージング装置OV110(Olympus)により解析した。
結果を図3に示す。図中、CD20は抗ヒトCD20抗体を、EpCAMは抗ヒトEpCAM抗体を、Col.4は抗マウスIV型コラーゲン抗体を示す。
抗ヒトCD20抗体は、抗原・抗体反応は起きないが、EPR効果により腫瘍組織に選択的に集積した。しかしながら、抗マウスIV型コラーゲン抗体よりも早く腫瘍組織から消失した。抗ヒトEpCAM抗体も腫瘍組織に集積していたことは認められたが、SUIT2腫瘍特異的であるにもかかわらず、抗マウスIV型コラーゲン抗体より早く消失した。抗マウスIV型コラーゲン抗体は、中和抗原であるマウスIV型コラーゲンがマウス血中に存在しているにもかかわらず、他の2抗体より長期間腫瘍組織に集積したことから、腫瘍への集積性が高いことが示された。
SN-38-リンカー-抗体複合体の製造
1.ポリマーとSN-38との結合
抗腫瘍性化合物SN-38をリンカーへ結合させた。
1H-NMR δ (CD3OD) 8.20 (d, J = 9.2 Hz, 1H), 7.99 (s, 1H), 7.66 (m, 2H), 5.60 (d, J = 16.5 Hz, 1H), 5.40 (d, J = 16.5 Hz, 1H), 5.32 (M, 2H), 3.93 (t, J = 6.4 Hz, 2H), 2.96 (t, J = 6.4 Hz, 2H), 1.97 (m, 2H), 1.43 (s, 9H), 1.40 (t, J = 7.6 Hz, 3H), 1,02 (t, J = 7.8 Hz, 3H);13C-NMR (DMSO-d6) δ164.8, 161.9, 149.2, 148.5, 143.1, 142.7, 141.3, 138.2, 137.7, 137.5, 122.4, 119.5, 118.9, 117.2, 110.7, 106.5, 89.7, 70.4, 64.6, 62.3, 62.0, 62.0, 62.0, 61.9, 61.8, 61.8, 61.7, 61.5, 58.1, 58.0, 57.1, 41.2, 40.1, 31.8, 28.1, 26.3, 19.4, 14.4, 4.9, -1.1.
1H-NMR (CD3OD) δ 8.20 (d, J = 9.2 Hz, 1H), 8.00 (s, 1H), 7.66-7.64 (m, 2H), 6.83 (s, 2H), 5.60 (d, J = 16.0 Hz, 1H), 5.41 (d, J = 16.0 Hz, 1H), 5.34 (s, 1H), 3.93 (t, J = 6.0 Hz, 2H), 2.97 (t, J = 6.0 Hz, 2H), 2.49-2.45 (m, 4H), 2.00-1.98 (m, 2H), 1.41 (t, J = 7.6 Hz, 3H), 1.02 (t, J = 7.6 Hz, 3H); 13C-NMR (DMSO-d6) δ 172.1, 170.4, 169.8, 169.7, 169.1, 156.5, 151.7, 149.7, 148.9, 146.2, 145.6, 145.0, 134.3, 131.1, 128.4, 126.8, 125.3, 118.8, 115.0, 96.5, 72.3, 69.9, 69.6, 69.5, 69.4, 69.0, 68.9, 66.7, 65.8, 65.1, 49.5, 36.0, 34.8, 34.1, 33.9, 31.6, 30.3, 25.4, 22.3, 13.9, 7.8.
国立がんセンターで作成した抗ヒトEpCAM抗体(B8-4)、抗マウスIV型コラーゲン抗体(35-4)、抗ヒトCD20抗体(Rituximab、中外製薬)を、それぞれの抗体がPBS中で濃度1.0mg/mlになるよう調整した。DTT(ジチオトレイトール)(Sigma)をファイナル10mMになるように加え、37℃で30分反応させ、限外ろ過(Amicon Ultra Centrigugal Filter Devices、Milipore Co)で反応試薬を除去した。得られた反応物を、Spectrophotometer(NanoDrop、SCRUM Inc.)で吸収測定したところ抗体の回収率は約80%であった。DNTB(Dinitrothiocyanobenzene、Wako)法によるSH基の定量結果から、1抗体あたり抗ヒトEpCAM抗体は8.7個、抗ヒトCD20抗体は7.2個、抗マウスIV型コラーゲン抗体は7.7個のSH基が得られたと考えられた。次に、タンパク質濃度0.5mg/mlとなるように100mMリン酸緩衝液+150mM NaCl+5mM EDTA(pH 6.0)に上記反応物を溶解し、モル比で抗体1に対しマレイミド化合物4の割合で混合した後、室温で1時間、その後4℃で一晩反応させた。限外ろ過で反応試薬を除去した後、PBSに置換した。蛋白質量は、Bradford法(Bio-Rad Protein Assay、500-0006JA、Bio-Rad)で測定した。蛋白の回収率はEpCAM抗体は51%、CD20抗体は77%、35-4抗体は51%の回収率であり、抗体1個あたりEpCAM抗体は8.4個、CD20抗体は6.7個、抗コラーゲン抗体は7.2個のSN-38が付加された。計算は同じくDNTB法で行った。得られた複合体の模式図を図4に示す。
in vitro殺細胞効果
実施例1で作製した、抗ヒトCD20抗体-SN-38複合体、抗ヒトEpCAM抗体-SN-38抗体及び抗マウスIV型コラーゲン抗体-SN-38複合体のin vitroでの殺細胞効果を、フリーのSN-38及びCPT-11と比較した。
96穴細胞プレートにPSN1もしくはSUIT2癌細胞を3000個撒き、24時間後に各複合体を添加し、その48時間後の細胞数をCell Counting Kit-8(Dojindo)を用いたWST-8法にて測定した。結果を図5に示す。
その結果、抗ヒトCD20抗体-SN-38複合体、抗ヒトEpCAM抗体-SN-38抗体及び抗マウスIV型コラーゲン抗体-SN-38複合体の抗腫瘍効果は、フリーのSN-38よりも減弱していたが、CPT-11を上回る抗腫瘍効果を維持していた。3種の複合体の間では抗腫瘍効果に差が認められなかった。
in vivo抗腫瘍効果
PSN1又はSUIT2をヌードマウスに皮下移植して、腫瘍径が6mmに達したとき、抗ヒトCD20抗体-SN-38複合体、抗ヒトEpCAM抗体-SN-38抗体又は抗マウスIV型コラーゲン抗体-SN-38複合体を静脈内投与し(SN-38換算で各3mg/kg)、腫瘍塊の大きさをモニターした。結果を図6に示す。in vitroでは3種の複合体の間で抗腫瘍効果に差が認められなかったが、in vivoでは抗マウスIV型コラーゲン抗体-SN-38複合体が最も高い抗腫瘍効果を示した。
腫瘍細胞と腫瘍血管への作用
SUIT2をヌードマウスに皮下移植して、腫瘍径が6mmに達したとき、抗マウスIV型コラーゲン抗体-SN-38複合体を静脈内投与し(SN-38換算で各3mg/kg)、病理組織学的特徴をモニターした。以下に詳細を示す。
抗体/薬物及び試薬
抗EpCAM抗体(クローンB8-4)を製造するハイブリドーマを、組換え蛋白質(R&Dシステムズ、ミネアポリス、MN、USA)を免疫したマウスから得た。抗コラーゲンIV抗体(クローン35-4)を製造するハイブリドーマを、精製蛋白質を免疫したラットから得た。免疫したマウスから得た脾臓細胞を骨髄腫細胞(P3X63Ag8.653)と融合させた。ハイブリドーマクローンを製造する特定の抗体は、ELISAを使用して結合する組換え蛋白質を選択した。抗ヒトCD20抗体(リツキシマブ)は、第一三共(東京、日本)から購入した。免疫組織化学では、ポリクローナル抗コラーゲンIV抗体(LSL-LB-1403)とモノクローナル抗CD31抗体(MEC13.3)をそれぞれコスモバイオ(東京、日本)及びベクトン・ディッキンソン(フランクリンレイクス、NJ、USA)から購入した。SN-38及びCPT-11(イリノテカン)は、それぞれ東京化成工業株式会社(東京、日本)及びヤクルト(東京、日本)から購入した。
ヒト膵臓癌細胞株PSN1は、American Type Culture Collection(ロックビル、MD、USA)から購入した。SUIT2は奥博士(静岡大学、静岡、日本)から提供された。両方の細胞株は、10%胎児ウシ血清(Tissue Culture Biologicals、CA、USA)、ペニシリン、ストレプトマイシン及びアンフォテリシンB(シグマ)を添加したDMEM(シグマ、セントルイス、MO、USA)中で5%CO2雰囲気下37℃で維持した。
実施例1と同様に作成し、抗体-プロドラッグ複合体の濃度を、ブラッドフォード法(Bio-Rad Protein Assay、500-0006JA、バイオ・ラッド ラボラトリーズ株式会社)を使用して決定した。チオール残基の数を、DNTPで定量した。各薬物(SN-38)/抗体の割合を、遊離チオールとチオール残基の数を比較することにより決定した(範囲は6.7~8.4)。
切除した組織を、4℃で5時間1%パラホルムアルデヒド溶液中で固定した。組織をPBSで洗浄し、室温で1時間、ブロッキング溶液(0.1%ウシ血清アルブミン及び0.1% Triton-X 100を含むPBS)でブロックした。ヒト試料は、US Biomax,Inc.(ロックビル、MD、USA)とBioChain Institute,Inc.(ヘイワード、CA、USA)から購入した。組織を、一次抗体として抗EpCAM抗体(B8-4)と抗コラーゲンIV抗体(35-4またはLSL-LB-1403)と一緒に室温で90分インキュベートした。PBSで3回洗浄した後、二次抗体としてAlexa 488標識抗マウスIgG(インビトロジェン)及びAlexa 555標識抗ラットIgG(インビトロジェン)と一緒に室温で60分インキュベートした。PBSで3回洗浄した後、DAPI(インビトロジェン)を含有するPBSでインキュベートした。Alexa 555標識抗ラットIgG(インビトロジェン)又は抗ヒトIgG(インビトロジェン)を、腫瘍に注射された抗体プロドラッグSN-38を検出するために使用した。組織をマウンティング溶液(Vector Laboratory)中でカバースリップで覆った。蛍光イメージを、digital high-definition microscopic SYSTEM BZ-9000(株式会社キーエンス、大阪、日本)又はレーザースキャン顕微鏡システムLSM 710(カールツァイス)を用いて得た。
メスBALB/cヌードマウス(5週齢)をSLC Japan(静岡、日本)から購入した。マウスには2×106個の細胞を脇腹に皮下接種した。腫瘍の大きさ(長さ(L)と幅(W))を4日ごとに測定し、腫瘍体積は(L×W2)/2を用いて計算した。全ての動物処理は国立がんセンターの動物実験委員会により確立された実験動物の管理及び使用に関するガイドラインを遵守して行った。このガイドラインは法的に要求される倫理基準に見合うものであり、日本における実験動物の使用のためのガイドラインを満たすものである。平均腫瘍体積が約90mm3(PSN1)又は約70mm3(SUIT2)になったとき、マウスを各5匹からなる4群に無作為に分けた。免疫抱合体は、尾静脈注射当日に投与した。SN-38用量に等しい抗体-SN-38プロドラッグの注射用量を、各薬物(SN-38)/抗体の割合に基づいて計算して決定した。
結果を図7に示す。図7中、A、C、E、Gは複合体を投与していない腫瘍であり、B、D、F、Hは複合体投与3ヶ月後の腫瘍を示す。A~Dはヘマトキシリン及びエオシンで染色したSUIT2腫瘍であり、Bで点線で囲まれた部分は生存している細胞を含む。Dで黒三角の先端で示した間の部分は形成された繊維性被膜の幅を示す。腫瘍の成長はKi67免疫化学的染色を用いて調べ、E及びFに示す。GとHの腫瘍血管及びその跡をCD31とコラーゲンIVのダブル染色で調べた。主な陽性部分を点線で囲んだ。
ネズミの異種移植モデルでしばしば見られるようにどちらの腫瘍も血流の減少により中央壊死が生じたが、コントロールの腫瘍は成長していたのに対し、複合体を投与した腫瘍は成長していなかった(A、B参照)。複合体を投与された腫瘍だけで大きな壊死病斑と濃い繊維性被膜の形成が見られた(C、D参照)。Ki67陽性の成長した腫瘍のほとんどはコントロールの境界上で見られたが、複合体投与された腫瘍の中央にも少しだけ見られた(E、F参照)。さらに、CD31陽性内皮細胞は境界領域で腫瘍に栄養を与える血管(tumor feeding vessel)を形成するが、コントロールとは違って複合体投与された腫瘍では観察されなかった。コラーゲン陽性の円形の環が血管の痕跡として、複合体投与された腫瘍の境界領域で見られた(G、H参照)。
以上の結果から、ターゲッティング物質を使用せずに抗腫瘍性化合物を投与した場合よりも、腫瘍間質の構成因子に対して特異的結合能を有する物質(例えば抗体コラーゲンIV抗体)と、それに結合した抗腫瘍性化合物を含む複合体を投与した場合の方が、in vivoにおいて高い抗腫瘍効果を達成し得ることが示唆された。また、腫瘍間質の構成因子に対して特異的結合能を有する物質(例えば抗体コラーゲンIV抗体)と、それに結合した抗腫瘍性化合物を含む複合体を投与することにより、腫瘍の境界領域で腫瘍に栄養を与える血管の形成が抑制されることが示された。
分岐状のリンカーの合成
(工程1)
3-(allyloxy)-2-(allyloxymethyl)-2-((but-3-enyloxy)methyl)propan-1-ol(14.85g、31.17mmol)のDMF(30mL)溶液にNaH(2.31g、160mmol)を室温で添加した。1時間後、臭化物1-((5-bromopentyloxy)methyl)-4-methoxybenzene(16.7g、58.04mmol)を添加した。フラスコをDMF(3mL)で2回洗浄した。混合物を55℃で1時間攪拌した。室温まで冷却した後、N,N-ジメチル 1,3-プロパンジアミン(10mL)を添加した。1時間後、混合物を飽和NH4Cl及びEtOAcで希釈した。水性層をEtOAcで抽出した。混合した層を飽和食塩水で洗浄した。有機層はNa2SO4で乾燥させ、濾過した。蒸発後、残渣をシリカゲルカラム(ヘキサン:EtOAc 9:1-4:1)で精製して無色油状物として上記式のエーテル化合物(8.60g、58%)を得た。
1H-NMR d 7.23 (dd, J = 6.4 Hz, 2.4 Hz, 2H), 6.5 (dd, J = 6.4 Hz, 2.4 Hz, 2H), 5.85 (m, 3H), 5.23 (d, J = 17.2 Hz, 3H), 5.11 (d, J = 10.4 Hz, 3H), 4.41 (s, 2H), 3.93 (m, 6H), 3.78 (s, 3H), 3.42 (s, 8H) 3.39-3.36 (m, 4H), 1.60-1.51 (m, 4H), 1.38 (m, 2H), 13C-NMR d 135.21, 129.11, 115.97, 113.69, 72.53, 72.26, 71.33, 7.13, 69.60, 69.42, 55.30, 45.44, 29.65, 29.50, 22.94.
工程1で得たトリアリル化合物1-((5-(3-(allyloxy)-2-(allyloxymethyl)-2-((but-3-enyloxy)methyl)propoxy)pentyloxy)methyl)-4-methoxybenzene(8.60g、18.06mmol)のCH2Cl2(200mL)及びMeOH(200mL)溶液に、反応混合物が薄い青色になるまで-78℃でオゾンを通気した。オゾンを酸素ガスに置換した後、NaBH4(8.60g、210mmol)を数回に分けて添加した。反応混合物を徐々に温めた後、一晩室温で攪拌した。反応液を濃縮後、混合物をCHCl3と飽和NH4Clとの間で分液した。水性層をCHCl3で抽出した。混合した層を飽和食塩水で洗浄し、Na2SO4で乾燥させ、濾過した。溶媒を減圧除去し、残渣をシリカゲルカラムクロマトグラフィー(CHCl3:MeOH 9:1)で精製し、上記式のトリオール化合物(8.56g quant.)を得た。
1H-NMR d 7.23 (d, J = 8.8 Hz, 2H), 6.85 (d, J = 8.8 Hz, 2H), 4.41 (s, 2H), 3.84 (s, 3H), 3.79 (s like, 6H), 3.53 (m, 6H), 3.48 (s like, 8H), 3.43-3.37 (m, 4H), 2.86 (s, 3H), 1.58-1.53 (m, 4H), 1.39 (m, 2H); 13C-NMR d 129.16, 113.69, 72.56, 72.50, 71.67, 70.46, 70.05, 70.00, 61.4, 55.30, 45.40, 29.56, 29.32, 22.92.
工程2で得たトリオール化合物(2,2'-(2-((2-hydroxyethoxy)methyl)-2-((5-(4-methoxybenzyloxy)pentyloxy)methyl)propane-1,3-diyl)bis(oxy)diethanol (2.91g、6.14mmol)及びPPh3(6.43g、24.51mmol)のTHF(50mL)溶液に、CBr4(8.14g、24.51mmol)を0℃で数回に分けて添加した。混合物を一晩室温で攪拌した。ジエチルエーテルを混合物に添加し、沈殿物を濾過した。濾液を濃縮し、シリカゲルカラムクロマトグラフィー(ヘキサン:EtOAc 9:1-4:1)で精製して上記式の三臭化物(3.48g、86%)を得た。
1H-NMR d 7.25 (d, J = 8.4 Hz, 2H), 6.87 (d, J = 8.4 Hz, 2H), 4.42 (s, 2H), 3.80 (s, 3H), 3.74-3.71 (m, 6H), 3.47 (s, 8H), 3.47-3.38 (m, 6H), 1.7-1.50 (m, 4H), 1.40 (m, 2H); 13C-NMR d 129.12, 113.66, 72.53, 71.33, 71.14, 70.08, 69.38, 68.88, 55.29, 45.72, 30.82, 29.63, 22.97.
工程3で得た三臭化物(1-((5-(3-(2-bromoethoxy)-2,2-bis((2-bromoethoxy)methyl)propoxy)pentyloxy)methyl)-4-methoxybenzene (3.48g、5.27mmol)のDMF(10mL)溶液に、NaN3(5.27g、81.08mmol)を添加し、混合物を50℃で4時間攪拌した。混合物をEtOAc及び飽和NaHCO3で希釈した。水性層をEtOAcで抽出した。混合した層を飽和食塩水で洗浄した。Na2SO4で混合物を乾燥後、溶媒を減圧濃縮した。残渣をシリカゲルカラムクロマトグラフィー(ヘキサン:EtOAc 7:3)で精製し、上記式のトリアジド化合物(2.84g、98%)を得た。
1H-NMR d 7.23 (d, J = 8.8 Hz, 2H), 6.85 (d, J = 8.8 Hz, 2H), 4.41 (s, 2H), 3.78 (s, 3H), 3.59 (t, J = 4.8 Hz, 6H), 3.47 (s, 8H), 3.44-3.28 (m, 10H), 1.61-1.55 (m, 4H), 1.39 (m, 2H); 13C-NMR d 129.04, 113.63, 72.53, 71.32, 70.46, 70.13, 69.71, 68.85, 55.32, 50.86, 45.12, 29.70, 23.04.
工程4で得たPMBエーテル(2.63g、4.7mmol)のCH2Cl2(30mL)及びH2O(20mL)溶液に、DDQ(1.30g、5.75mmol)を0℃で添加した。添加後、氷浴を取り除き、室温で撹拌した。5時間後、反応をクエン酸緩衝液で停止させ、水性層をEtOAcで抽出した。混合した層を飽和NaHCO3及び飽和食塩水で洗浄した。有機層はNa2SO4で乾燥させた。濾過後、溶媒を除去した。残渣をシリカゲルカラムクロマトグラフィー(ヘキサン:EtOAc 1:1)で精製し、上記式のアルコール化合物(1.55g、75%)を得た。
1H-NMR d 3.64-3.58 (m, 8H), 3.46 (s, 6H), 3.41-3.38 (m, 4H), 3.31-3.28 (m, 6H), 1.57-1.55 (m, 4H), 1.41 (m, 2H); 13C-NMR d 71.20, 70.46, 69.67, 68.84, 62.92, 50.86, 45.08, 32.57, 29.36, 22.56.
工程5で得たアルコール化合物(1.55g、3.61mmol)のアセトン(20mL)溶液に、ジョーンズ試薬を0℃で添加した。過剰のジョーンズ試薬をiPrOHで破壊し、沈殿物を濾過した。濃縮後、残渣をシリカゲルカラムクロマトグラフィー(CHCl3:EtOAc 7:3-1:1)で精製し、上記式の酸(1.37g、86%)を得た。
1H-NMR d 3.72 (t, J = 6.0 Hz, 3H), 3.60 (t, J = 4.4 Hz, 4H), 3.47 (s, 8H), 3.44-3.40 (m, 4H), 3.32 (t, J = 4.8 Hz, 4H), 2.83 (t, J = 7.6 Hz, 2H), 1,70 (m, 2H), 1.60 (m, 2H); 13C-NMR d177.69, 77.21, 70.77, 70.48, 69.68, 68.96, 50.87, 45.11, 33.55, 28.93, 21.81.
工程6で得た酸(1.65g、3.85mmol)、N-(tert-butoxycarbonyl)-1,5-diaminopentane(1.56g、7.69mmol)及びHOBt(1.03g、7.60mmol)のCH2Cl2(30mL)溶液に、WSCDI(1.47g、7.69mmol)を0℃で添加した。混合物を一晩室温で攪拌し、CHCl3及び飽和NH4Clで希釈した。水性層をCHCl3で抽出した。混合した層を飽和NaHCO3及び飽和食塩水で洗浄し、Na2SO4で乾燥させ、溶媒を濃縮した。残渣をシリカゲルカラムクロマトグラフィー(CHCl3:EtOAc 1:1-EtOAc only)で精製し、上記式のアミド化合物(2.18g、90%)を得た。
1H-NMR d 5.60 (bs, 1H), 4.55 (bs, 1H), 3.72 (t, J = 6.0 Hz, 2H), 3.62 (t, J = 4.8 Hz, 4H), 3.47-3.41 (m, 12H), 3.30 (t, J = 4.8 Hz, 4H), 3.22 (q, J = 6.4 H, 2H), 3.10 (m, 2H), 2.17 (t, J = 7.2 Hz, 2H), 1.70-1.46 (m, 7H), 1.43 (s, 9H), 1.34 (m, 3H), 13C-NMR d172.64, 155.87, 77.21, 71.15, 71.13, 70.99, 70.94, 70.50, 69.73, 69.69, 69.36, 68.97, 50.91, 45.35, 45.11, 40.35, 39.36, 36.56, 31.00, 29.88, 20.40, 29.23, 28.55, 24.09, 22.77.
一方で、工程7で合成したトリアジド(63mg、0.10mmol)のジオキサン(1mL)と水(1mL)の溶液にトリフェニルホスフィン(105mg、0.40mmol)を加え、窒素雰囲気下室温にて終夜撹拌した。
反応液を濃縮し、上のカルボン酸をCH2Cl2(10mL)に溶かし加え、これにHOBt(54mg、0.4mmol)、WSCDI(76mg、0.40mmol)を加えた。反応液を終夜室温にて撹拌し、反応液をLH20(CHCl3:MeOH 1:1)、シリカゲルカラムクロマトグラフィー(CHCl3:MeOH 9:1-4:1)にて精製し、0.22gを得た。これをCH2Cl2(4.5mL)とTFA(0.5mL)に溶かし、1時間室温にて撹拌した後、反応液を減圧濃縮した。これをCH2Cl2(1mL)に溶かし、iPr2NEt(0.1mL)を加え、N-succimidyl 3-Maleimidopropionate(13mg、0. 470mmol)を加えた。室温にて2時間撹拌し、これをLH20(CHCl3:MeOH 1:1)、シリカゲルカラムクロマトグラフィー(CHCl3:MeOH 9:1-4:1)にて精製し、65mgの目的物を得た。
抗コラーゲンタイプIV抗体を産生するハイブリドーマクローン35-4(ラット抗マウスコラーゲンタイプIV抗体 IgG2a)、6-1(マウス抗ヒトコラーゲンタイプIV抗体 IgM)、6-2(マウス抗ヒトコラーゲンタイプIV抗体 IgM)及び56P-1(マウス抗ヒトコラーゲンタイプIV抗体 IgM)より抗体のVL及びVH部位をクローニングし、ヌクレオチド配列を決定した。
ハイブリドーマクローン35-4から得られた重鎖G2aのVH部位の塩基配列を配列番号1に示す。rIgG2aクローンBC088240.1の対応するcDNA配列(配列番号9)とのアライメントの結果を、図8に示す。
ハイブリドーマクローン35-4から得られた重鎖G2aのVH部位の塩基配列から推定されたアミノ酸配列を配列番号12に示す。rIgG2aクローンBC088240.1の対応するアミノ酸配列(配列番号20)とのアライメントの結果を、図9に示す。
ハイブリドーマクローン6-1、6-2及び56P-1から得られた重鎖MuのVH部位の塩基配列から推定されたアミノ酸配列を、それぞれ配列番号14、16及び18に示す。IgM可変領域クローンJ00529.1及びIgM定常領域クローンV00827.1の対応するアミノ酸配列(配列番号21)とのアライメントの結果を、図11に示す。
ハイブリドーマクローン35-4、6-1、6-2及び56P-1から得られたκ鎖のVL部位の塩基配列から推定されたアミノ酸配列を、それぞれ配列番号13、15、17及び19に示す。κ鎖クローンBC088255.1の対応するアミノ酸配列(配列番号22)とのアライメントの結果を、図13に示す。
ヒト膵癌の手術標本を、抗ヒトフィブリン抗体(国立がんセンター作成)で染色した。腫瘍組織内の間質に、多くのフィブリン塊が認められた。
抗体の生体イメージング
抗マウスフィブリン抗体(国立がんセンター作成)の腫瘍集積性を検討した。
BALB/cヌードマウス背部にHT29を移植し、移植10日後に抗マウスフィブリン抗体(IRDye800(Li-Cor)により標識化)をマウス尾静脈より投与した。投与後の抗体の分布を生体イメージング装置OV110(Olympus)により解析した。
投与後においても、抗マウスフィブリン抗体の腫瘍組織内における集積が認められることから、抗フィブリン抗体は腫瘍への集積性が高いことが示された。
抗フィブリン抗体-SN-38複合体(エステル結合の態様)の製造
ヒトフィブリノゲンをフィブリンに変換し、ヒトフィブリンでマウスを免疫することにより、ヒトフィブリンを特異的に認識するモノクローナル抗体を得た。本抗体はマウスフィブリンにも交差反応した。本抗体の可変部分のcDNA配列を明らかにし、該可変領域と、ヒトFc部分とを含むキメラ抗体を作成した。
実施例1と同様に、抗フィブリン抗体-SN-38複合体を製造した。ここで得られる複合体においては、SN-38がエステル結合を介してリンカーに結合している。得られた複合体の模式図を下に示す。
抗フィブリン抗体-SN-38複合体(カルバメート結合の態様)の製造
ここで得られる複合体においては、SN-38がカルバメート結合を介してリンカーに結合している。得られた複合体の模式図を下に示す。
in vivo抗腫瘍効果
ヒト大腸癌HT29をヌードマウスに皮下移植して、腫瘍径が6mmに達したとき、実施例6で得られた抗フィブリン抗体-SN-38複合体(以下Fib-E)、実施例7で得られた抗フィブリン抗体-SN-38複合体(以下Fib-N)、又は生理食塩水(コントロール)を静脈内投与し(SN-38換算で各3mg/kg)、投与後20日目の腫瘍径の大きさをモニターした。結果を図14に示す。
いずれの抗フィブリン抗体-SN-38複合体も高い抗腫瘍効果を示したが、Fib-Eのほうが、Fib-Nよりも高い抗腫瘍効果を示した。
Claims (17)
- 間質の構成因子に対して特異的結合能を有する物質及び該物質へ結合した抗腫瘍性部位を含む複合体。
- 間質の構成因子に対して特異的結合能を有する物質と抗腫瘍性部位とがリンカーを介して結合している、請求項1記載の複合体。
- 抗腫瘍性部位が抗腫瘍性化合物である、請求項1記載の複合体。
- 抗腫瘍性部位が抗腫瘍性化合物を徐放できる機能性構造である、請求項1記載の複合体。
- 抗腫瘍性化合物を徐放できる機能性構造が、抗腫瘍性化合物を含有するリポソーム又はミセルである、請求項4記載の複合体。
- 間質の構成因子に対して特異的結合能を有する物質が、間質の構成因子に対して特異的結合能を有する抗体又はその結合性断片である、請求項1記載の複合体。
- 間質の構成因子がコラーゲンである、請求項1記載の複合体。
- コラーゲンがIV型コラーゲンである、請求項7記載の複合体。
- 間質の構成因子がフィブリンである、請求項1記載の複合体。
- リンカーと抗腫瘍性部位とが、エステル結合又はカルバメート結合を介して結合している、請求項2記載の複合体。
- リンカーと抗腫瘍性部位とが、カーボネート結合又はチオカルバメート結合を介して結合している、請求項2記載の複合体。
- 請求項1記載の複合体を含む、腫瘍の治療剤。
- 請求項1記載の複合体を含む、腫瘍血管形成阻害剤。
- 哺乳動物に対して有効量の請求項1記載の複合体を投与することを含む、該哺乳動物における腫瘍の治療方法。
- 哺乳動物に対して有効量の請求項1記載の複合体を投与することを含む、該哺乳動物における腫瘍血管の形成を阻害する方法。
- 腫瘍の治療において使用するための、請求項1記載の複合体。
- 腫瘍血管の形成阻害において使用するための、請求項1記載の複合体。
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US13/129,710 US20110287036A1 (en) | 2008-11-17 | 2009-11-17 | Novel cancer targeting therapy using complex of subtance capable of binding specifically to constituent factor of cancer stroma and anti-tumor compound |
JP2010537830A JP5593488B2 (ja) | 2008-11-17 | 2009-11-17 | 癌間質の構成因子に対して特異的結合能を有する物質と抗腫瘍性化合物との複合体による新規の癌ターゲティング治療 |
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US9233171B2 (en) | 2011-11-21 | 2016-01-12 | Immunogen, Inc. | Method of treatment of tumors that are resistant to EGFR antibody therapies by EGFR antibody cytotoxic agent conjugate |
US9393304B2 (en) | 2008-10-29 | 2016-07-19 | Ablynx N.V. | Formulations of single domain antigen binding molecules |
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WO2018203517A1 (ja) * | 2017-05-02 | 2018-11-08 | 国立研究開発法人国立がん研究センター | 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 |
WO2023171009A1 (ja) | 2022-03-09 | 2023-09-14 | 株式会社Cured | Eva1タンパク質に結合する、ヒト化抗体又はその機能的断片、抗体薬物複合体及びキメラ抗原受容体 |
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US10723794B2 (en) | 2015-03-18 | 2020-07-28 | University Of South Carolina | Anti-CcL8 antibodies and uses thereof |
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EP2359852A1 (en) | 2011-08-24 |
JPWO2010055950A1 (ja) | 2012-04-12 |
JP5593488B2 (ja) | 2014-09-24 |
US20110287036A1 (en) | 2011-11-24 |
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