WO2014069682A1 - Anticorps ciblant le cancer et composition permettant de prévenir ou de traiter le cancer en contenant - Google Patents

Anticorps ciblant le cancer et composition permettant de prévenir ou de traiter le cancer en contenant Download PDF

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WO2014069682A1
WO2014069682A1 PCT/KR2012/008952 KR2012008952W WO2014069682A1 WO 2014069682 A1 WO2014069682 A1 WO 2014069682A1 KR 2012008952 W KR2012008952 W KR 2012008952W WO 2014069682 A1 WO2014069682 A1 WO 2014069682A1
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cancer
antibody
seq
amino acid
acid sequence
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PCT/KR2012/008952
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English (en)
Korean (ko)
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허대영
박가빈
김영석
송현근
김성한
이현경
박세광
양재욱
정하나
박솔지
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인제대학교 산학협력단
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Publication of WO2014069682A1 publication Critical patent/WO2014069682A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P39/00—General protective or antinoxious agents

Definitions

  • the present invention relates to monoclonal antibodies that bind to cancer cells and induce apoptosis and their medical use.
  • Cancer is one of the most deadly threats to human health. In the United States, nearly 1,300,000 new patients get cancer each year, causing about one in four deaths following heart disease. It is also predicted that cancer can surpass cardiovascular disease as the first cause of death within five years. Solid cancer accounts for most of these deaths. Although significant progress has been made in the medical treatment of certain cancers, the overall 5-year survival rate for all cancers has improved only about 10% over the past 20 years. Cancer or malignant tumors metastasize and grow rapidly in an uncontrolled manner, making it very difficult to detect and treat in a timely manner. In addition, cancer can occur from almost any tissue in the body through one or several normal cells in the tissue through malignant transformation, and differ from one type of cancer with a particular tissue origin.
  • Tumor cells differ in antigenicity from normal cells due to the presence of "tumor antigens". They may be specific to tumor cells, or are recognized as “tumor-associated antigens” (TAAs) by being expressed differently or in excess. Tumor cells not only differ in protein primary structure, i.e. from amino acid sequences, from normal cell changes, but also in secondary and tertiary due to changes in post-translational modifications, such as changes in glycosylation and phosphorylation. The structure may also differ from normal cells, which continually change the antigenicity of the protein and also specify it as a tumor-associated antigen.
  • TAAs tumor-associated antigens
  • protein mucin from the mammary gland which itself is not a change present in tumor cells, but autoantibodies to it are found in breast cancer patients (sometimes in ovarian cancer). The reason is presumably because the protein is highly glycosylated in normal cells and is not exposed at all due to the dense and thick coating of carbohydrate chains. Poor glycosylation in tumor cells results in exposure of protein fragments that act as antigenic determinants to the immune system.
  • TAA is currently thought to be a molecule that can be associated with certain tumors, such as lymphomas, carcinomas, sarcomas, or melanoma, and can elicit cellular and / or humoral immune responses against tumors and, rarely, against tumors. It also defends the host.
  • tumors such as lymphomas, carcinomas, sarcomas, or melanoma
  • Such TAAs are currently classified into three classes, which are highly specific for certain tumors that are present in only one or only a few individuals and are not found in normal cells, for example tumor-specific transplant antigens (class 1). ); Present in a large number of related tumors of different patients (second class); And present in normal cells and malignant cells and expressed in large quantities in malignant cells (third class). Since the second class of TAA is present in many tumors and rarely observed in normal subjects, it is considered to have the greatest potential for clinically useful analyses.
  • Korean Laid-Open Patent Publication 10-2010-0045903 discloses an antibody targeting anti DR5, which is an apoptosis receptor for cancer cells.
  • the present invention is to provide a novel antibody targeting a tumor cell specific antigen and a method for treating cancer inducing apoptosis of cancer cells through the antibody.
  • the present invention binds to cancer cells as a monoclonal antibody inducing apoptosis
  • a light chain variable region comprising a light chain CDR1 consisting of the amino acid sequence of SEQ ID NO: 1, a light chain CDR2 consisting of the amino acid sequence of SEQ ID NO: 2, and a light chain CDR3 consisting of the amino acid sequence of SEQ ID NO: 3;
  • an antibody comprising a heavy chain variable region comprising a heavy chain CDR1 consisting of the amino acid sequence of SEQ ID NO: 4, a heavy chain CDR2 consisting of the amino acid sequence of SEQ ID NO: 5, and a heavy chain CDR3 consisting of the amino acid sequence of SEQ ID NO: 6.
  • the antibody is a single-chain variable fragment (scFv, single-chain variable fragment) antibody, and may have an amino acid sequence of SEQ ID NO: 9.
  • the present invention also provides a gene encoding the single chain variable region antibody.
  • the present invention also provides a pharmaceutical composition for preventing or treating cancer containing the antibody as an active ingredient.
  • the present invention also provides a cancer cell targeting diagnostic or therapeutic conjugate comprising the antibody, wherein one or more diagnostic or anticancer agents are bound to the antibody.
  • the antibody of the present invention has an activity of specifically binding to a cancer cell line, and can be used as a cancer cell targeting diagnosis or therapeutic conjugate to effectively diagnose or treat cancer.
  • the antibody of the present invention shows a property of inducing apoptosis by binding to cancer cells, particularly lymphoma cells and ovarian cancer cells, through which the antibody of the present invention can be used as an anticancer agent.
  • Example 1 is a flow cytometry result for the IM9 cell line of Example 1.
  • Figure 2 shows the nucleotide and amino acid sequences of the scFv ITTab2 and CDR and linker regions thereof according to the present invention.
  • Figure 3 is a flow cytometry test results of examining the binding of the antibody of the present invention to breast cancer cells.
  • Figure 4 is a flow cytometry test results of examining apoptosis of breast cancer cells by the antibody treatment of the present invention.
  • Figure 5 shows a mouse breast cancer cell line of the antibody of the present invention This is the result of flow cytometry experiment examining the binding.
  • Figure 6 is a graph of the results of experiments examining the tumor growth inhibitory effect of breast cancer cells by the antibody treatment of the present invention in vivo conditions.
  • the present invention is a monoclonal antibody that binds to cancer cells and induces apoptosis
  • a light chain variable region comprising a light chain CDR1 consisting of the amino acid sequence of SEQ ID NO: 1, a light chain CDR2 consisting of the amino acid sequence of SEQ ID NO: 2, and a light chain CDR3 consisting of the amino acid sequence of SEQ ID NO: 3;
  • an antibody comprising a heavy chain variable region comprising a heavy chain CDR1 consisting of the amino acid sequence of SEQ ID NO: 4, a heavy chain CDR2 consisting of the amino acid sequence of SEQ ID NO: 5, and a heavy chain CDR3 consisting of the amino acid sequence of SEQ ID NO: 6.
  • the inventors of the present invention while studying a novel antibody targeting a tumor cell specific antigen, constructed a hybridoma cell that specifically binds to B cell tumor cells (IM9) using PBMC stimulated with ConA, The monoclonal antibody prepared through this specifically binds to cancer cells, in particular breast cancer cells, and confirmed that it also induces apoptosis thereof, thereby completing the present invention.
  • IM9 B cell tumor cells
  • the light chain variable region may consist of the amino acid sequence of SEQ ID NO: 7.
  • the heavy chain variable region may be composed of the amino acid sequence of SEQ ID NO: 8.
  • an "antibody” may be an entire form of an antibody ("antibody") or a functional fragment thereof.
  • the whole antibody may be in the form of a monomer or a multimer in which two or more whole antibodies are bound.
  • the functional fragment of the antibody is an antibody having the heavy and light chain variable regions of the whole antibody, which means to recognize substantially the same epitope that the whole antibody recognizes.
  • Functional fragments of the antibody include, but are not limited to, single chain variable region fragments (scFv), (scFv) 2 , Fab, Fab 'and F (ab') 2, and the like. Antibodies in the form of single-chain variable fragments (scFv) are preferred.
  • the single chain variable region refers to an antibody fragment in which a heavy chain variable region and a light chain variable region are linked through a linker peptide to take the form of a single chain polypeptide.
  • the antibody can be generated using methods known in the art, such as phage display methods or yeast cell surface expression systems.
  • the antibody of the invention is a single chain variable region antibody, which may have the amino acid sequence of SEQ ID NO.
  • the antibodies of the present invention may be derived from any animal, including mammals, birds, and the like, including humans.
  • the antibody may be a human, mouse, donkey, sheep, rabbit, goat, guinea pig, camel, horse or chicken antibody.
  • the human antibody is an antibody having an amino acid sequence of human immunoglobulin, and includes an antibody isolated from a human immunoglobulin library or an antibody isolated from an animal transfected against one or more human immunoglobulins and not expressing an endogenous immunoglobulin.
  • the present invention also provides a gene encoding a single-chain variable region antibody having the amino acid sequence of SEQ ID NO: 9.
  • Gene sequences encoding the antibodies of the invention can be obtained by methods well known in the art. For example, based on DNA sequences or corresponding amino acid sequences encoding portions or all of the heavy and light chains of the antibody, oligonucleotide synthesis techniques well known in the art, for example site-directed mutagenesis And the polymerase chain reaction (PCR) method.
  • PCR polymerase chain reaction
  • the gene encoding the single-chain variable region antibody having the amino acid sequence of SEQ ID NO: 9 may be composed of the nucleotide sequence of SEQ ID NO: 10.
  • the host cell is transformed with the gene and the expression vector including the same, and cultured under appropriate conditions to express and isolate the antibody, thereby producing an antibody molecule.
  • the antibody of the present invention exhibits a property of specifically binding to cancer cells, and in particular, binds to lymphoma cells and ovarian cancer cells and induces cell death, and thus can be used for the prevention or treatment of cancer.
  • the present invention provides a pharmaceutical composition for preventing or treating cancer containing the antibody as an active ingredient, the use of the antibody for the manufacture of an anticancer agent, and administering to the subject a therapeutically effective amount of the antibody to a subject. To provide.
  • the pharmaceutical composition for preventing or treating cancer containing the antibody as an active ingredient is a suitable carrier, excipient, disintegrant, sweetener, coating agent, swelling agent, It may further comprise one or more additives selected from the group consisting of lubricants, lubricants, flavors, antioxidants, buffers, bacteriostatics, diluents, dispersants, surfactants, binders and lubricants.
  • the carriers, excipients and diluents are lactose, dextrose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia rubber, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methyl cellulose, microcrystalline Cellulose, polyvinyl pyrrolidone, water, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate and mineral oil can be used, and solid preparations for oral administration include tablets, pills, powders, granules, capsules.
  • solid preparations may be prepared by mixing at least one excipient such as starch, calcium carbonate, sucrose or lactose, gelatin and the like in the composition.
  • excipients such as starch, calcium carbonate, sucrose or lactose, gelatin and the like
  • lubricants such as magnesium styrate and talc may also be used.
  • Oral liquid preparations include suspensions, solvents, emulsions, syrups, and the like, and may include various excipients such as wetting agents, sweeteners, fragrances, and preservatives, in addition to commonly used simple diluents such as water and liquid paraffin.
  • Formulations for parenteral administration include sterile aqueous solutions, non-aqueous solvents, suspensions, emulsions, lyophilized preparations, suppositories, and the like.
  • non-aqueous solvent and suspending agent propylene glycol, polyethylene glycol, vegetable oil such as olive oil, injectable ester such as ethyl oleate and the like can be used.
  • Witsol, macrogol, tween 61, cacao butter, laurin butter, glycerogelatin and the like may be used as the base material of the suppository.
  • the pharmaceutical composition for preventing or treating cancer containing the antibody as an active ingredient is a granule, powder, coated tablet, tablet, pill, capsule, suppository, gel, syrup, juice It can be formulated as a suspension, emulsion, drop or liquid.
  • the pharmaceutical composition is intravenous, intraarterial, intraperitoneal, intramuscular, intraarterial, intraperitoneal, intrasternal, transdermal, nasal, inhaled, topical, rectal, oral, intraocular or intradermal Via the route can be administered to the subject in a conventional manner.
  • the preferred dosage of the antibody may vary depending on the condition and weight of the subject, the type and extent of the disease, the form of the drug, the route of administration, and the duration and may be appropriately selected by those skilled in the art. According to one embodiment of the present invention, but not limited thereto, the daily dosage may be 0.01 to 200 mg / kg, specifically 0.1 to 200 mg / kg, more specifically 0.1 to 100 mg / kg. Administration may be administered once a day or divided into several times, thereby not limiting the scope of the invention.
  • the 'subject' may be a mammal including a human, but is not limited thereto.
  • the cancer may be any one selected from liver cancer, lung cancer, colon cancer, ovarian cancer, breast cancer, prostate cancer, leukemia, lymphoma and pancreatic cancer.
  • the present invention also provides a cancer cell targeting diagnostic or therapeutic conjugate comprising the antibody and binding one or more diagnostic or anticancer agents to the antibody.
  • the diagnostic agent may be any one or two or more selected from the group consisting of radionuclides, paramagnetic metal ions, superparamagnetic nanoparticles, chromophores, chromophores, luminescent materials, and fluorescent materials
  • the contrast agent may be CT contrast agent, MRI. It may be any one selected from the group consisting of a contrast agent, an optical contrast agent, and an ultrasound contrast agent.
  • the anticancer agent may be used without limitation as long as it is conventionally used for the treatment of cancer, for example cisplatin, 5-fluorouracil, adriamycin, methotrexate, vinblastine, busulfan, chlorambucil, cyclophosphamide, Melphalan, nitrogen mustard, nitrosourea, taxol, paclitaxel, docetaxel, 6-mercaptopurine, 6-thioguanine, bleomycin, daunorubicin, doxorubicin, epirubicin, idarubicin, mitomycin-C And hydroxyurea can be used any one or two or more selected from the group consisting of.
  • the linkage between the anticancer agent and the antibody of the present invention can be carried out through methods known in the art, such as covalent bonds, crosslinking and the like.
  • the anticancer agent may be a therapeutic radionuclide, for example, 32 P, 47 Sc, 64 Ga, 64 Cu, 66 Cu, 67 Cu, 89 Sr, 90 Y, 91 Y, 103 Pd, 103 m Rh, 105 Rh, 111 Ag, 111 In, 117m Sn, 125 I, 131 I, 145 Sm, 149 Pm, 153 Sm, 165 Dy, 166 Ho, 169 Er, 176 Lu, 177 Lu, 182 Ta, 186 Re, 188 Re, 188 W , 192 Ir, 195 m Pt, 198 Au, 199 Au, 211 At, 212 Bi, 213 Bi, 223 Ra, 225 Ac, 230 U, 252 Cf, or a combination thereof.
  • a therapeutic radionuclide for example, 32 P, 47 Sc, 64 Ga, 64 Cu, 66 Cu, 67 Cu, 89 Sr, 90 Y, 91 Y, 103 Pd, 103 m Rh
  • the amount of the antibody of the present invention included in the cancer cell targeting therapeutic conjugate of the present invention may vary depending on the type and amount of the anticancer agent to be bound.
  • the amount of the anticancer agent administered for treatment may be an amount sufficient to deliver the target cancer disease site.
  • the drug is determined not only by the route of administration and the number of treatments, but also by various factors such as the age, weight, health condition, sex, severity of the disease, diet, and excretion rate, the effective dose to the patient is determined. In view of this, one of ordinary skill in the art will be able to determine an appropriate effective amount depending on the use of the antibody for treating cancer diseases by combining the antibody with an anticancer agent.
  • the cancer cell targeting therapeutic conjugate of the present invention may include a suitable buffer solution for maintaining / preserving the stability of the antibody.
  • the cancer cell targeting therapeutic conjugate of the present invention is not particularly limited to its formulation, route of administration, and method of administration so long as the desired effect is achieved in the present invention.
  • the conjugates of the present invention can be administered parenterally, such as subcutaneous injection, intramuscular injection, intravenous injection, urethral injection, intrabronchial inhalation, intrauterine dural or cerebrovascular injection, and the like.
  • cancer cell targeting therapeutic conjugates of the present invention include appropriate carriers, excipients, disintegrants, sweeteners, coating agents, swelling agents, lubricants, lubricants, flavoring agents, antioxidants, buffers, bactericides, diluents, It may further comprise one or more additives selected from the group consisting of dispersants, surfactants, binders and lubricants.
  • cancer cell targeting therapeutic conjugate of the present invention may be formulated into granules, powders, coated tablets, tablets, pills, capsules, suppositories, gels, syrups, juices, suspensions, emulsions, drops or solutions according to conventional methods.
  • injectables can be prepared in the form of unit dose ampoules or multiple dose inclusions.
  • mice were 5-6 week old female Balb / c mice purchased from Orient Bio. The purchased mouse was purified for 1 week with sufficient supply of solid feed and water in an indoor environment with a temperature of 20-25 ° C., a humidity of 60%, and an illumination of 200-300 Lux .
  • PBMC 1X10 7 isolated from Ficoll-gradient method from healthy volunteers was stimulated with Con A (concanavalin A) at 10 ⁇ g / ml and immunized with mice. After 2 months, the spleens of mice were isolated and 1X10 8 splenocytes were isolated. Was obtained and fused with 10 7 SP 2 / 0-Ag14 mouse myeloma cells (PEG 4000; Sigma, St Louis, MO) method. The method is described in detail in Kohler G, Milstein C. Nature 256 (1975) 495-497. FACS staining was performed using the obtained culture supernatant of 100 hybridoma cell lines to obtain hybridoma cells reactive to B cell tumor cells (IM9, Raju, Ramos).
  • Con A canavalin A
  • scFv single-chain Fv
  • hybridoma F6 cells hybridoma cells obtained in the method 1 of production of antibodies that bind to B cell tumor cells (IM9).
  • IM9 B cell tumor cells
  • Separation and purification step (a1) for purifying RNA A polymerase chain reaction amplification step (a2) for amplifying the first strand cDNA by a polymerase chain reaction of a mouse antibody gene; A cell fabrication step (a3) of fabricating a competent cell; It is composed of a library completion step (a4) for completing a single chain Fv (scFv) library based on the production step.
  • Separation and purification step (a1) is to purify RNA, cultivate hybridoma F6 cells, add TRIZOL 2ml to F6 cell 1x10 7 using TRIZOL reagent for 5 minutes at room temperature, and then 200ul of chloroform per 1ml TRIZOL. I vortex for about 15 seconds. And centrifuged for 15 minutes at 13000rpm at 4 °C using a centrifuge. Then, the supernatant was carefully transferred to a microcentrifuge tube so as not to pick the middle layer, and isopropyl alcohol was mixed in the same ratio and reacted at room temperature for 10 minutes.
  • Polymerase chain reaction amplification step (a2) is a step of preparing the first strand cDNA and amplifying the polymerase chain reaction of the mouse antibody gene, and the purified RNA 2 ug in the purification step (a1) and 0.5 ug oligo (dT) and After mixing and adding distilled water to a final volume of 10 ul and reacted for 5 minutes at 75 °C. Thereafter, 15 ul of cDNA reaction solution (5 ul of 5 x M-MLV reaction solution, 100 units of M-MLV reverse transcriptase, 10 mM dNTP 1.25 ul, and RNase Inhibitor 4 units) were added and vortex mixed with an RNA sample. The reaction was carried out in a chain polymerization apparatus at 37 ° C. for 1 hour and at 95 ° C. for 5 minutes to amplify the polymerase chain reaction with an mGAPDH primer.
  • the antibody gene was amplified by polymerase chain reaction with a mouse antibody specific primer. Amplify the variable regions of the light and heavy chains, bind them with overlapping polymerase chain reaction using linker-specific primers, and clone them into the Sfi I restriction site of the pComb3X-TT expression vector. was produced.
  • the primer used at this time was determined by a manual (Barbas et al., Phage Display; A Laboratory Manual, Cold Spring Harbor Laboratory, (2001), New York), and was prepared and manufactured by Bioneer (Korea).
  • Polymerase chain reaction conditions were pre-denaturated at 94 ° C. for 5 minutes, followed by 25 cycles of reaction at 94 ° C. 30 sec, 57 ° C. 15 sec, and 72 ° C. 30 sec. The presence or absence of amplification was confirmed by 1% agarose gel electrophoresis, purified using Qiagen gel extraction kit, and the amplified light chain variable region and heavy chain variable region were subjected to the following overlapping polymerase chain reaction.
  • the polymerase chain reaction product was purified by DNA from agarose with Qiagen gel extraction kit, restriction enzyme digestion with Sfi I, and then gel extraction.
  • Sfi I was added to a mixture of the cut antibody gene 30 ng and Sfi I cleavage pComb3X-TT 30 ng after 10X buffer and a ligase (ligase, Gibco-BRL, USA ) 10 unit and the reaction at room temperature for 2 hours after TOP10F Transformed competent cells.
  • Cell production step (a3) is a step of producing a competent cell (Electrocompetent cell), incubation of E. coli ER2537 in a minimal plate (minimal plate) to induce the expression of the F 'cilia after the production of water-soluble cells (competent cell) Used.
  • ER2537 was inoculated in 2 ml of SB medium (10 g MOPS, 30 g, bacto-trypton, 20 g yeast extract in 1 L) and incubated at 37 ° C. for 18 hours, followed by OD 600 to 3.54.
  • 1 ml of the pre-culture was incubated in 100 ml of LB medium (10 g NaCl, 10 g, bacto-trypton, 5 g yeast extract in 1 L) so that the OD 600 was 0.4. Thereafter, centrifuge was performed for 10 minutes at 4,000 rpm at 4 °C. The cells were suspended with 20 ml of 50 mM CaCl 2 and then reacted for 30 minutes on ice, and then centrifuged at 4,000 rpm for 10 minutes at 4 ° C. The supernatant was removed and 3 ml of (10% glycerol + 50 mM CaCl 2 ) was added to the cells, followed by aliquoting of 50ul.
  • LB medium 10 g NaCl, 10 g, bacto-trypton, 5 g yeast extract in 1 L
  • the library completion step (a4) is a step of completing the scFv (single chain Fv) library based on the preparation step, and 100 ⁇ g / mL of ampicillin after infecting the recovered phage antibody with Escherichia coli ER2537. Plates were added to the added LB agar plates and incubated at 37 ° C for 18 hours. The colonies formed were inoculated into 5 mL of SB (SB / amp) liquid medium to which 100 ⁇ g / mL of ampicillin was added and shaken at 37 ° C. at 250 rpm for 4 hours.
  • SB SB / amp
  • phage formation 10 10 pfu of VCSM13 was added and allowed to stand at 37 ° C for 30 minutes for infection, followed by incubation at 250 rpm at 37 ° C for 1 hour 30 minutes, and kanamycin was added to 70 ⁇ g / mL for 18 hours at 37 ° C. Incubated. Thereafter, the culture solution was centrifuged at 2,500 rpm for 10 minutes to recover the supernatant containing phage.
  • the antibody function checking step (B) confirms the function of the antibodies completed in the library completion step (a4), and treats phage antibodies that recognize IM-9 cells with ⁇ -M13 and ⁇ -mIgG-PE. After FACS staining was confirmed whether the binding to IM9 B cell tumor cells.
  • IM-9 cells (10 6 ) were treated with 1 ug of ITTab2 and after 30 min binding, washed with PBS. The washed cells were combined with FITC-conjugated goat anti-mouse IgG, (Sigma-Aldrich) for 30 minutes, washed with PBS three times, and observed with FACS Calibur (BD Pharmingen). The results are shown in FIG.
  • CDRs Complimentarily-determining regions
  • ITFab2 variable region of ITFab2 of scFv (short-chain Fv) type
  • the underlined sites are linker sites, which are divided into light and heavy chains as borders. From the site indicated in the font, the heavy chain CDR1, CDR2 and CDR3 were determined. The sites shown in bold at the front of the light chain bordering the linker were determined by CDR1, CDR2 and CDR3 of the light chain.
  • ITTab2 shows the base and amino acid sequences of ITTab2 and their CDRs and linker regions.
  • ITTab2 is in bold font CDR1 (SEQ ID NO: 1), CDR2 (SEQ ID NO: 2), CDR3 (SEQ ID NO: 3), CDR1 (SEQ ID NO: 4), CDR2 (SEQ ID NO: 5) of the heavy chain ), CDR3 (SEQ ID NO: 6).
  • the entire amino acid sequence of ITTab2 is shown in SEQ ID NO: 9, and the entire nucleotide sequence is shown in SEQ ID NO: 10.
  • FIG. 3 it was confirmed that the ITTab2 antigen was expressed by ITTab2 on both the cell surface and the cytoplasm of the flow cytometry, and it was found that the target antigen for the antibody of the present invention was present in breast cancer cells.
  • the target antigen for the antibody of the present invention was present in breast cancer cells.
  • FIG. 4 it was found that apotosis cells were increased due to the treatment of ITTab2 antibody, which suggests that ITTab2 of the present invention can be developed as an apoptosis-inducing antibody in breast cancer cells.
  • TUBO and TUBO-P2J cell lines were used in the Inje Medical School of Microbiology.
  • TUBO-P2J cells are modified cell lines of TUBO cell lines isolated from breast cancer tissues naturally occurring in HER2 / neu overexpressed Balb / c mice, which are metastatic cell lines that naturally metastasize to the lung when transplanted into the skin.
  • Culture of cells was performed in 10% heat-inactivated fetal bovine serum (Sigma), 10% NCTC 109 medium, 2 mmol / l L-glutamine, 0.1 mmol / l MEM non-essential amino acid, 100 units / ml penicillin in a 5% CO 2 incubator. And 100 mg / ml streptomycin added in DMEM medium.
  • mice for in vivo tumor models were purchased from 5-6 week old female Balb / c mice from Orient Bio. The purchased mice were purified for 1 week with sufficient solid feed and water in an indoor environment with a temperature of 20-25 ° C., a humidity of 60% and an illuminance of 200-300 Lux .
  • Tumors were formed by injecting 2 ⁇ 10 5 TUBO cells subcutaneously into the back of mice. Tumor size was measured using the formula of width x length x height / 2 by measuring width, length, and height, respectively. From day 17 after tumor transplantation, 100 ⁇ g or 200 ⁇ g of ITTab2 was injected intraperitoneally 8 times at 3 day intervals. Tumor size was observed until death of the mouse.
  • the tumor growth tended to decrease with the concentration of ITTab2, and in particular, 200 ug of ITTab2 treatment effectively reduced tumor growth.

Abstract

La présente invention concerne un anticorps monoclonal capable d'induire l'apoptose d'une cellule cancéreuse en se liant à elle, ainsi que son utilisation médicale. L'anticorps selon la présente invention présente une activité spécifique de liaison aux lignées cellulaires cancéreuses et peut donc être utilisé dans le cadre d'un diagnostic ciblant les cellules cancéreuses ou en tant que conjugué médicamenteux en vue d'un diagnostic ou d'un traitement efficace du cancer. L'anticorps selon la présente invention présente également la caractéristique d'induire l'apoptose des cellules cancéreuses en se liant à elles et, en particulier, l'apoptose des cellules de cancer du sein, si bien que l'anticorps selon la présente invention peut être utilisé seul en tant que médicament anticancéreux.
PCT/KR2012/008952 2012-10-29 2012-10-29 Anticorps ciblant le cancer et composition permettant de prévenir ou de traiter le cancer en contenant WO2014069682A1 (fr)

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KR20090078339A (ko) * 2006-10-06 2009-07-17 다케다 야쿠힌 고교 가부시키가이샤 암의 예방·치료제
US7691376B2 (en) * 1999-08-13 2010-04-06 Immunocellular Therapeutics, Ltd. Ovarian cancer cell and myeloma cell surface glycoproteins, antibodies thereto, and uses thereof

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