WO2015016096A1 - 自己免疫性関節炎の判定方法および自己免疫性関節炎惹起性t細胞活性化抑制物質のスクリーニング方法 - Google Patents
自己免疫性関節炎の判定方法および自己免疫性関節炎惹起性t細胞活性化抑制物質のスクリーニング方法 Download PDFInfo
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6854—Immunoglobulins
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- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
- G01N33/5008—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics
- G01N33/5044—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells for testing or evaluating the effect of chemical or biological compounds, e.g. drugs, cosmetics involving specific cell types
- G01N33/5047—Cells of the immune system
- G01N33/505—Cells of the immune system involving T-cells
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/564—Immunoassay; Biospecific binding assay; Materials therefor for pre-existing immune complex or autoimmune disease, i.e. systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, rheumatoid factors or complement components C1-C9
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
- G01N33/56966—Animal cells
- G01N33/56972—White blood cells
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2800/00—Detection or diagnosis of diseases
- G01N2800/10—Musculoskeletal or connective tissue disorders
- G01N2800/101—Diffuse connective tissue disease, e.g. Sjögren, Wegener's granulomatosis
- G01N2800/102—Arthritis; Rheumatoid arthritis, i.e. inflammation of peripheral joints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2800/00—Detection or diagnosis of diseases
- G01N2800/50—Determining the risk of developing a disease
Definitions
- the present invention relates to a method for determining autoimmune arthritis and a method for screening an autoimmune arthritis-inducing T cell activation inhibitor.
- Rheumatoid arthritis is an autoimmune disease that causes chronic inflammation and tissue destruction centering on joints throughout the body, affecting about 1% of the total population.
- pathological autoimmune reactions by acquired immune cells (T cells and B cells) and chronic inflammation by inflammatory cytokines are two pillars of the disease state.
- inflammatory cytokines good control has been obtained by anti-cytokine therapy.
- the pathological autoimmune reaction has not been corrected, the relapse of the disease after the discontinuation of the anti-cytokine therapy has become a major problem.
- CD4-positive T cells are important as a central player of pathological autoimmune reactions occurring in rheumatoid arthritis, but the self-antigen recognized by disease-induced CD4-positive T cells has long been unknown. Met. This has hindered antigen-specific control of autoimmune reactions and analysis of disease-inducing CD4-positive T cells.
- Type II collagen-induced arthritis see Non-Patent Document 1
- CD4 positive T cells are necessary in this system
- type II collagen produced in the body as a result of immunization It is known that autoantibodies against can also cause arthritis, and it is unclear whether type II collagen-specific CD4-positive T cells can cause arthritis in the absence of autoantibodies.
- autoimmune arthritis There are still many unclear points about autoimmune arthritis such as rheumatoid arthritis, and finding a new self-antigen that causes autoimmune arthritis is an important issue. Among them, no autoantigen of autoimmune arthritis caused by CD4 positive T cell dependency and autoantibody independence has been reported so far. If such an autoantigen can be found, autoimmune arthritis It is expected to lead to the analysis of the mechanism and the development of therapy.
- An object of the present invention is to find an autoantigen of autoimmune arthritis caused by CD4 positive T cell dependence and autoantibody independence. Further provided are methods for determining the onset or likelihood of development of autoimmune arthritis using such autoantigens, and causing T cell-dependent autoimmune arthritis in response to such autoantigens. It is an object of the present invention to provide a method for screening a substance that suppresses activation of CD4 positive T cells.
- the present invention includes the following inventions in order to solve the above problems.
- a method for determining the onset or likelihood of onset of autoimmune arthritis wherein the following (1) or (2) present in a sample derived from a subject is detected.
- ribosomal protein L23a or a fragment thereof for determining the onset or likelihood of development of autoimmune arthritis, using ribosomal protein L23a or a fragment thereof as an antibody against ribosomal protein L23a, or ribosomal protein L23a Use characterized by detecting reactive CD4 positive T cells.
- the ribosomal protein L23a is a protein consisting of the amino acid sequence represented by SEQ ID NO: 1.
- the fragment of ribosomal protein L23a comprises the 71st to 90th positions of the amino acid sequence represented by SEQ ID NO: 1.
- a screening method for a substance that suppresses activation of autoimmune arthritis-inducing T cells comprising a step of bringing a test substance into contact with a T cell that reacts with ribosomal protein L23a, ribosomal protein L23a or its A screening method comprising: contacting a fragment; measuring the activation state of the T cell; and analyzing a change in the activation state of the T cell depending on a test substance.
- an inflammatory cytokine secreted from the T cell, proliferation of the T cell, or an activation surface marker of the T cell is measured. The screening method according to [7] above.
- ribosomal protein L23a is a protein consisting of the amino acid sequence represented by SEQ ID NO: 1.
- the present invention it is possible to provide a method for determining the onset or likelihood of onset of autoimmune arthritis.
- the protein fragment which can be used suitably for research of these methods and autoimmune arthritis can be provided.
- the present inventors have established an SKG mouse that causes autoimmune arthritis that closely resembles rheumatoid arthritis (Japanese Patent No. 3467520), and has proceeded with analysis.
- SKG mice have a point mutation in the T cell signaling factor ZAP70, which causes abnormal selection of T cells in the thymus, and autoreactive T cells that cause arthritis appear in the periphery and cause arthritis (Sakaguchi, N. et al. Altered thymic T-cell selection due to a mutation of the ZAP-70 gene causes autoimmune arthritis in mice.Nature 426, 454-460, doi: 10.1038 / nature02119 (2003), Hirota, K. et al.
- T cell self-reactivity forms a cytokine milieu for spontaneous development of IL-17 + Th cells that cause autoimmune arthritis.
- Arthritis in SKG mice is CD4-positive T cell dependent. That is, recipient mice develop arthritis by transferring CD4 positive T cells to immunodeficient mice.
- the present inventors found CD4 positive T cells that cause arthritis in an autoantibody independent manner using SKG mice, and searched for recognition antigens of the CD4 positive T cells.
- Ribosomal protein L23a was identified as an autoantigen that causes CD4-positive T cell-dependent autoimmune arthritis. As a result of further research on this self-antigen, the present invention was completed.
- the present invention provides a method for determining the onset or likelihood of onset of autoimmune arthritis.
- the determination method of the present invention can be performed by detecting (1) an antibody against ribosomal protein L23a present in a sample derived from a subject, or (2) a CD4-positive T cell that reacts with ribosomal protein L23a.
- the autoimmune arthritis to be determined according to the present invention may be any arthritis as long as it is arthritis caused by autoantibodies or autoreactive T cells. Examples include rheumatoid arthritis, reactive arthritis, psoriatic arthritis, ankylosing spondylitis, collagen disease-related arthritis, and the like. Rheumatoid arthritis is preferable.
- the subject is not particularly limited, but is preferably a person who has developed arthritis or a person who is suspected of having arthritis. Those who are suspected of developing arthritis include those who have subjective symptoms of arthritis. Moreover, it is preferable that a test subject is anti-CCP antibody negative. Specifically, it is preferable to be a subject who develops arthritis but is anti-CCP antibody negative, or a subject who is suspected of developing arthritis but is negative for anti-CCP antibody.
- the subject-derived sample is not particularly limited as long as it contains an antibody or T cell.
- blood, serum, plasma, tissue fluid, lymph fluid, cerebrospinal fluid, pus, mucus, runny nose, sputum, urine, feces Body fluids such as ascites can be preferably used.
- the antibody against ribosomal protein L23a (hereinafter referred to as “L23a”) may be any antibody that specifically binds to L23a.
- the CD4 positive T cell that reacts with L23a may be any CD4 positive T cell that reacts with L23a and is activated.
- L23a or a fragment thereof can be used for detection of an antibody against L23a and detection of CD4-positive T cells that react with L23a.
- the origin of L23a to be used is not particularly limited, but mammalian L23a is preferable. As mammals, humans, chimpanzees, monkeys, dogs, cows, sheep, rabbits, mice, rats, guinea pigs and the like are preferable, and humans are more preferable. Mammalian L23a is well conserved, and at least the amino acid sequences of human, rhesus monkey, cow, sheep, rat, and mouse L23a are identical (SEQ ID NO: 1). The amino acid sequence of L23a of various animals and the base sequence of the gene encoding it can be obtained from a known database (DDBJ / GenBank / EMBL, etc.) with the accession numbers shown in Table 1, for example.
- the fragment of L23a is not particularly limited as long as it comprises a part of L23a, but preferably comprises a part of mammalian L23a, and a part of L23a comprising the amino acid sequence represented by SEQ ID NO: 1 It is more preferable that The number of amino acid residues in the L23a fragment is not particularly limited, but is preferably 5 residues or more.
- the upper limit is not particularly limited, but is preferably about 140 residues or less, more preferably about 120 residues or less, further preferably about 100 residues or less, further preferably about 80 residues or less, and further preferably about 60 residues or less. About 40 residues or less, more preferably about 20 residues or less.
- the fragment of L23a is preferably a fragment comprising the amino acid sequence at positions 71 to 90 (LDHYAIIKFPLTTESAMKKI, SEQ ID NO: 3) of the amino acid sequence of L23a (SEQ ID NO: 1), more preferably SEQ ID NO: 3. A fragment consisting of the amino acid sequence shown.
- L23a and L23a fragments are constructed by constructing a recombinant expression vector in which a gene encoding L23a or a fragment thereof can be expressed, for example, by a known genetic engineering technique, and introducing this into a suitable host cell as a recombinant protein. It can be produced by expressing and purifying.
- the L23a and L23a fragments can be produced, for example, using an in vitro transcription / translation system.
- the L23a and L23a fragments can be produced by a solid phase synthesis method (Fmoc method, Boc method) or a liquid phase synthesis method according to a known general peptide synthesis protocol.
- the method for detecting an antibody against L23a is not particularly limited, and a known method for detecting an antibody that specifically binds to an antigen can be appropriately selected and used.
- the ELISA method can be suitably used.
- L23a or a fragment thereof can be immobilized on a plate, reacted with serum from a subject, and detected using an appropriate secondary antibody.
- the criteria for determining whether the antibody against L23a is positive can be determined on the basis of the amount of antibody against L23a as a control, for example, using a normal individual with respect to arthritis (for example, a person without subjective symptoms of arthritis) as a control. For example, using the same method as the method for detecting an antibody against L23a in a subject, the amount of antibody against L23a in a plurality of controls is measured, and an average value and a standard deviation (SD) are calculated.
- SD standard deviation
- Examples of the reference value include a method of determining that a value below that is normal and a value exceeding that value as positive. However, it is not limited to this. It is also possible to accumulate the control antibody amount as background data and calculate the reference value using the accumulated data.
- the method for detecting CD4 positive T cells that react with L23a is not particularly limited, and a known method for detecting T cells that react specifically with an antigen can be appropriately selected and used.
- a method for detecting cells that secrete inflammatory cytokines by reacting with L23a a method for detecting the proliferation of L23a-reactive CD4-positive T cells, a method for detecting an activated surface marker (such as CD154), etc.
- CD4-positive T cells are isolated from the blood of a subject by a known method, the obtained cells are contacted with L23a or a fragment thereof, and cells that secrete inflammatory cytokines are detected with a flow cytometer.
- Inflammatory cytokines include IFN- ⁇ , TNF- ⁇ , IL-1, IL-6, IL-8, IL-12, IL17, IL-18 and the like.
- the subject can determine that the L23a-reactive CD4-positive T cell is positive.
- the subject When it is judged that at least one of an antibody against L23a and a CD4 positive T cell that reacts with L23a is positive, the subject is determined to have autoimmune arthritis or is likely to develop autoimmune arthritis Can do. Being able to determine the onset or likelihood of onset of autoimmune arthritis makes it possible to determine the onset of disease by earlier and effective therapeutic intervention or by more careful follow-up.
- the determination method of the present invention is for those who develop arthritis but are anti-CCP antibody-negative or This is very useful in that it can be used for subjects who are suspected of developing arthritis but are negative for anti-CCP antibodies, and can determine the onset or onset of autoimmune arthritis in these subjects.
- the present invention provides a screening method for a substance that suppresses the activation of autoimmune arthritis-induced T cells.
- the screening method of the present invention comprises a step of bringing a test substance into contact with a T cell that reacts with L23a, a step of bringing the T cell into contact with L23a or a fragment thereof, a step of measuring the activation state of the T cell, What is necessary is just to include the process of analyzing the change of an activation state dependent on a test substance.
- the substance obtained by the screening method of the present invention is useful as an active ingredient of a preventive or therapeutic agent for autoimmune arthritis.
- test substances to which the screening method of the present invention is applied include, for example, nucleic acids, peptides, proteins, non-peptide compounds, synthetic compounds, fermentation products, cell extracts, cell culture supernatants, plant extracts, mammalian tissues An extract, plasma, etc. are mentioned.
- the test substance may be a novel substance or a known substance.
- T cells that react with L23a (hereinafter referred to as “L23a-reactive T cells”) can be collected from autoimmune arthritis patients according to the above-described method for detecting CD4-positive T cells that react with L23a.
- L23a-reactive T cells can be obtained by introducing a T cell receptor gene that specifically recognizes L23a into a T cell line that does not express T cell receptor (eg, 5KC-73.8.20). Can be produced (see Examples).
- the method for bringing the test substance into contact with the L23a-reactive T cell may be any method as long as the cell can be brought into contact with the test substance, and is not particularly limited. .
- a method of adding a test substance to a medium in which L23a-reactive T cells are cultured a method of replacing a medium in which L23a-reactive T cells are cultured with a medium containing a test substance, and the like can be mentioned.
- the method of bringing L23a-reactive T cells into contact with L23a or a fragment thereof is not particularly limited, and it is not limited to the medium in which L23a-reactive T cells are cultured. Examples include a method of adding L23a or a fragment thereof, and a method of exchanging a medium in which L23a-reactive T cells are cultured with a medium containing L23a or a fragment thereof.
- Either the step of bringing the test substance into contact with the T cells that react with L23a and the step of bringing L23a or a fragment thereof into contact with the L23a-reactive T cells may be performed first or simultaneously. That is, L23a or a fragment thereof may be contacted after contacting a test substance with L23a-reactive T cells, or a test substance is contacted with L23a-reactive T cells after contacting L23a or a fragment thereof. Alternatively, the test substance and L23a or a fragment thereof may be simultaneously contacted with L23a-reactive T cells.
- the measurement target is not particularly limited as long as it is an indicator of the activation state of L23a-reactive T cells.
- measurement of inflammatory cytokines secreted from L23a-reactive T cells, measurement of proliferation of L23a-reactive T cells, measurement of activation surface markers of L23a-reactive T cells, and the like can be suitably used.
- the inflammatory cytokine secreted from L23a-reactive T cells can be measured in the step of measuring the activation state of L23a-reactive T cells.
- the inflammatory cytokine to be measured is not particularly limited, and one or more of the known inflammatory cytokines exemplified above may be appropriately selected.
- the method for measuring inflammatory cytokine is not particularly limited, and may be appropriately selected from known methods (for example, Western blot method, EIA method, ELISA method, RIA method, etc.) capable of measuring the inflammatory cytokine to be measured.
- the change in the test substance-dependent inflammatory cytokine secretion may be analyzed.
- the method for analyzing changes in the amount of inflammatory cytokine secretion dependent on the test substance is not particularly limited. For example, if the amount of inflammatory cytokine secretion is reduced when the test substance is contacted as compared to the amount of inflammatory cytokine secretion in the control group that is not contacted with the test substance, the test substance is induced to cause autoimmune arthritis. It can be selected as a substance that suppresses the activation of T cells.
- the degree to which the test substance decreases the inflammatory cytokine secretion amount is not particularly limited, but, for example, a test substance that reduces the inflammatory cytokine secretion amount to 50% or less of the cells not contacted with the test substance is preferable, and 25% The test substance to be made below is more preferable.
- the proliferation of L23a-reactive T cells may be measured in the step of measuring the activation state of L23a-reactive T cells.
- the method for measuring the proliferation of L23a-reactive T cells is not particularly limited, and can be appropriately selected from known cell proliferation measurement methods.
- the measurement can be performed by measurement of tritiated thymidine incorporation, detection of division by CFSE label, and the like.
- the change in the amount of cell proliferation dependent on the test substance may be analyzed.
- the method for analyzing the change in the amount of cell growth dependent on the test substance is not particularly limited. For example, if the amount of cell proliferation is decreased when the test substance is contacted compared to the amount of cell proliferation in the control group not contacted with the test substance, the test substance is treated with the activity of autoimmune arthritis-inducing T cells. It can be selected as a substance that suppresses crystallization.
- the degree to which the test substance decreases the amount of cell growth is not particularly limited. For example, a test substance that is 50% or less is preferable compared to the cell growth amount of cells not contacted with the test substance, and the test is to be 25% or less. Substances are more preferred.
- the activation surface marker of L23a-reactive T cells may be measured in the step of measuring the activation state of L23a-reactive T cells.
- the target activation surface marker is not particularly limited, and examples thereof include CD154.
- the method for measuring the surface marker is not particularly limited, and may be appropriately selected from known methods (for example, a method using a flow cytometer) that can measure the cell surface marker.
- the change in the amount of the activation surface marker dependent on the test substance may be analyzed.
- the method for analyzing the change in the amount of the activated surface marker depending on the test substance is not particularly limited. For example, if the amount of the activated surface marker decreases when the test substance is brought into contact with the amount of the activated surface marker in the control group that is not brought into contact with the test substance, the test substance is caused to cause autoimmune arthritis. It can be selected as a substance that suppresses the activation of T cells.
- the degree to which the test substance decreases the amount of the activated surface marker is not particularly limited. For example, a test substance that is reduced to 50% or less as compared with the amount of the activated surface marker of cells not contacted with the test substance is preferable, and 25% The test substance to be made below is more preferable.
- the present invention includes a medicament for preventing or treating autoimmune arthritis, which comprises a substance that suppresses activation of L23a-reactive T cells as an active ingredient.
- preparations for oral administration include solid or liquid dosage forms, specifically tablets (including sugar-coated tablets and film-coated tablets), pills, granules, powders, capsules (including soft capsules), Examples include syrups, emulsions, and suspensions.
- These preparations are produced by a known method and contain carriers, diluents or excipients usually used in the pharmaceutical field. For example, lactose, starch, sucrose, magnesium stearate and the like are used as carriers and excipients for tablets.
- injections for example, injections, suppositories and the like are used, and injections are intravenous injections, subcutaneous injections, intradermal injections, intramuscular injections, infusions, intraarticular injections. And other dosage forms.
- Such an injection is prepared by, for example, dissolving, suspending or emulsifying the substance that suppresses the activation of the L23a-reactive T cells or a salt thereof in a sterile aqueous or oily liquid usually used for injections according to a known method. To prepare.
- aqueous solution for injection for example, isotonic solution containing physiological saline, glucose and other adjuvants, and the like are used, and suitable solubilizers such as alcohol (for example, ethanol), polyalcohol (for example, , Propylene glycol, polyethylene glycol, etc.), nonionic surfactants (eg, polysorbate 80, HCO-50, etc.) and the like.
- suitable solubilizers such as alcohol (for example, ethanol), polyalcohol (for example, , Propylene glycol, polyethylene glycol, etc.), nonionic surfactants (eg, polysorbate 80, HCO-50, etc.) and the like.
- oily liquid for example, sesame oil, soybean oil and the like are used, and benzyl benzoate, benzyl alcohol and the like may be used in combination as a solubilizing agent.
- a suppository used for rectal administration is prepared by mixing a substance that suppresses the expression or function of SIK3 or a salt thereof with an ordinary suppository base. Since the preparation thus obtained is safe and has low toxicity, for example, humans or mammals (eg, mice, rats, rabbits, sheep, pigs, cows, horses, birds, cats, dogs, monkeys, chimpanzees, etc.) Can be administered orally or parenterally.
- humans or mammals eg, mice, rats, rabbits, sheep, pigs, cows, horses, birds, cats, dogs, monkeys, chimpanzees, etc.
- the present invention provides a fragment of L23a.
- the fragment of the present invention can be used for detection of an antibody against L23a and detection of CD4 positive T cells that react with L23a.
- the fragment of the present invention can also be used for basic studies such as analysis of CD4 positive T cells that cause arthritis independent of autoantibody, and analysis of mechanism of arthritis independent of autoantibody.
- Effector CD4-positive T cells were collected from the joint area of efox SKG mice that developed arthritis. Specifically, the synovial tissue was separated from the ankle joint, and decomposed at 37 ° C. for 1 hour using LIBERASE TM TM (Roche) -containing RPMI1640. The tissue was passed through a nylon mesh to prepare a single cell suspension. GFP-negative CD4-positive T cells were sorted into single cells on a 96-well PCR plate using a Moflo cellor sorter cyclone apparatus. The plate was stored at ⁇ 80 ° C. until use.
- the T cell receptor was cloned from the sorted GFP negative CD4 positive T cells by the nested PCR method. Specifically, 5 ⁇ L / well reaction mix [100 mg / mL gelatin, 0.1% Triton X-100, 4U / mL RNAsin, 125ng OligodT (Promega), 0.5mM dNTPs, 5U / mL Multiscribe RT enzyme, 1xRT Buffer ( High Throughput cDNA kit, Applied Biosystems)] was added and reacted at 25 ° C for 10 minutes, 37 ° C for 2 hours, and 85 ° C for 5 minutes to perform reverse transcription.
- 5 ⁇ L / well reaction mix [100 mg / mL gelatin, 0.1% Triton X-100, 4U / mL RNAsin, 125ng OligodT (Promega), 0.5mM dNTPs, 5U / mL Multiscribe RT enzyme, 1xRT Buffer ( High
- the ⁇ chain was subcloned using MfeI and StuI restriction enzyme recognition sites, and the ⁇ chain was BamHI and XhoI restriction enzyme recognition sites.
- Each of the T cell receptor genes was cloned from about 150 single cells.
- a retrogenic mouse was produced using the produced retroviral vector.
- This vector plasmid was transfected into the Plat-E cell line using Fugene 6 transfection reagent (Roche). After 48 hours and 72 hours, the supernatant containing the retrovirus was collected and passed through a 0.45 ⁇ m filter to remove dust.
- 150 mg / kg of 5-fluorouracil was intraperitoneally administered to RAG2 knockout mice lacking T cells and B cells and having SKG mutations (produced by crossing SKG mice and RAG2 knockout mice). Four days later, bone marrow cells were collected and red blood cells were removed.
- DMEM solution containing 20% fetal bovine serum, penicillin, streptomycin, 2-ME in the presence of IL-3 (20 ng / mL), IL-6 (40 ng / mL), SCF (50 ng / mL) (Peprotech)
- the bone marrow cells were cultured at a concentration of 2 ⁇ 10 6 cells / mL.
- IL-3 (20 ng / mL), IL-6 (40 ng / mL), SCF (50 ng / mL) and polybrene (4 ⁇ g / mL) were added to the retrovirus-containing supernatant.
- the bone marrow cells were infected with the retrovirus by centrifugation at 700 g, 32 ° C. for 90 minutes. On day 4 of culture, the bone marrow cells were injected intravenously into RAG2 knockout mice irradiated with 600 rads. About 30 types of retrogenic mice each infected with one type of retrovirus were prepared.
- the produced retrogenic mouse expresses only a single pair of T cell receptors introduced and expressed by a retroviral vector as T cell receptors on T cells. By observing whether each retrogenic mouse develops arthritis, it is possible to verify whether the T cell receptor of the retrogenic mouse has arthritis-inducing ability.
- the produced retrogenic mouse was bred in an SPF environment, and an individual who spontaneously developed arthritis was found. Pictures of mice that developed arthritis are shown in FIGS. 1 (A) and 1 (B). Furthermore, the retrovirus infecting the mouse was analyzed, and the amino acid sequence of the arthritis-inducing T cell receptor was identified (see FIG. 2). In FIG.
- sequences indicated as “14D-3 / DV8 * 03”, “40 * 01”, “10 * 01” and “2-1 * 01” are, for example, databases IMGT / LIGM-DB (http: / /www.imgt.org/ligmdb/).
- the arthritis-inducing T cell receptor recognition antigen candidates found above were narrowed down as follows.
- the T cell receptor gene that has been confirmed to cause arthritis is transferred to the T cell line 5KC-73.8.20 that does not express the T cell receptor using the above-mentioned retroviral vector-containing supernatant. The same method was used for gene transfer.
- This cell line is known to produce IL-2 upon stimulation from the T cell receptor.
- CD11c + cells and CD11b + cells were concentrated and recovered with MACS beads from spleen cells of BALB / c mice using MACS beads (Milteny) to prepare antigen-presenting cells (APC).
- APC antigen-presenting cells
- a cell lysate of synovial cells of SKG mice that developed arthritis was prepared, separated into each band using the NATIVE-PAGE method, and each band was cut out to extract a protein contained in each band.
- the T cell line (5 ⁇ 10 4 cells / well) introduced with the T cell receptor gene and the antigen-presenting cells (5 ⁇ 10 4 cells / well) were seeded in a 96-well round bottom plate, and each of the above bands
- the protein extracted from was added and co-cultured. After incubation for 24 hours, the IL-2 concentration in the supernatant was measured using ELISA (ebioscience). Bands with significantly increased IL-2 concentration were selected as candidate bands. Extracted proteins from candidate bands were subjected to mass spectrometry, and a plurality of candidate proteins were narrowed down from the results.
- Recombinant proteins are prepared for each candidate protein and added to the above T cell line and antigen-presenting cell co-culture system to determine whether it is an arthritis-inducing T cell receptor recognition antigen or not. The rise was confirmed by an indicator. As a result, it was found that the IL-2 concentration increased when L23a (60S23ribosomal protein L23a) was added.
- a cell disruption solution (positive control) of the above T cell receptor gene-introduced T cell line, the above antigen presenting cell (APC), recombinant GST-L23a, recombinant GST and mouse myeloma cell (B cell) strain P3U1 The test groups shown in Table 1 below were provided. Each cell was seeded in a 96-well round bottom plate, a medium supplemented with a test substance was added and cultured for 24 hours, and then the IL-2 concentration in the supernatant was measured using ELISA (ebioscience).
- the present inventor confirmed that the arthritis-inducing T cell receptor cloned this time reacts with the P3U1 cell lysate, and therefore used the P3U1 cell lysate as a positive control.
- the cell lysate was prepared as follows. That is, 1 ⁇ 10 7 cells were suspended in 1 mL of PBS, frozen in liquid nitrogen and thawed. Subsequently, sonication for 30 seconds was repeated three times, followed by centrifugation at 15000 rpm for 15 minutes, and the supernatant was used as a cell lysate. The results are shown in FIG. As is apparent from FIG. 3, GST-L23a was shown to activate the arthritis-inducing T cell receptor in a concentration-dependent manner.
- the peptide concentration was 50 ⁇ g / mL, and the GST-L23a concentration was 100 ⁇ g / mL.
- the results are shown in FIG. As is clear from FIG. 4, L23a71-90 markedly increased the IL-2 concentration. On the other hand, L23a6-25 did not increase the IL-2 concentration. Although not shown in the figure, all the peptides other than L23a71-90 had the same results as L23a6-25. From this result, it was clarified that the fragment consisting of the amino acid sequence at positions 71 to 90 (LDHYAIIKFPLTTESAMKKI, SEQ ID NO: 3) of L23a is a recognition antigen for arthritis-inducing T cell receptor.
- the transferred membrane was reacted with 200-fold diluted serum, washed, and then reacted with HRP-labeled anti-mouse IgG1 antibody as a secondary antibody at 2000-fold dilution. After washing, color was developed using ECL Prime Western Blotting Detection Reagent and detected using LAS-4000mini.
- histone H1.2 is a protein that has been confirmed to have no reactivity although it was included in the recognition antigen candidate of the arthritis-inducing T cell receptor cloned this time, and encodes mouse histone H1.2.
- the coding region of DNA (ACCESSION: NM — 015786) was inserted into the expression vector pGEX-6P1 and prepared as a recombinant protein to which a GST tag was added in the same manner as GST-L23a.
- the left arrow indicates the position of the GST-L23a band
- the right arrow indicates the position of the protein in the P3U1 cell lysate to which the antibody in the serum is bound. Since there was no antibody binding to GST-histone 1.2, a large amount of antibody recognizing L23a may be present in the serum of an arthritis-inducing T cell receptor-expressing retrogenic mouse that recognizes L23a. It became clear.
- Serum was obtained from 374 patients with rheumatoid arthritis and 80 normal people without rheumatoid arthritis.
- Recombinant GST-L23a or recombinant GST was dissolved in PBS to prepare a 200 ng / mL solution.
- PBS ELISA polysoap plate
- Each was added to wells of an ELISA polysoap plate (trade name, Nunc) and adsorbed at 4 ° C. for 16 hours. The plate was washed 5 times with PBS containing 0.05% Tween 20, and then blocked with PBS containing 1% BSA for 1 hour.
- the plate was washed five times in the same manner, and 100 ⁇ L of serum diluted 500-fold with PBS containing 1% BSA was added to each well. After leaving at room temperature for 2 hours and washing 5 times, HRP-labeled anti-human IgG (H + L) (diluted 4000 times with PBS containing 1% BSA) was added and left at room temperature for 1 hour. After washing 5 times, TMB was added and the value of OD450nm was measured 15 minutes later. The value obtained by subtracting the OD value of GST from the OD value of GST-L23a was used as the OD value of the antibody against L23a.
- HRP-labeled anti-human IgG H + L
- TMB was added and the value of OD450nm was measured 15 minutes later. The value obtained by subtracting the OD value of GST from the OD value of GST-L23a was used as the OD value of the antibody against L23a.
- Control represents a normal person
- RA represents a rheumatoid arthritis patient.
- the unit (U / mL) is arbitrarily set based on one positive serum.
- a normal value of + 3SD or less (below the broken line in the figure) of the average of normal persons was determined as a normal value, and a value exceeding that was determined as positive.
- FIG. 6 only 1 out of 80 normal people was positive, but 64 out of 374 patients with rheumatoid arthritis were positive.
- the t value was significantly different from the p value of 0.0012.
- Synovial fluid was collected from one patient with rheumatoid arthritis. Blood was collected from one healthy person. Mononuclear cells were separated from joint fluid and blood, respectively. Specifically, Ficoll was added to joint fluid or blood, and mononuclear cells were separated and collected by centrifugation at 2200 rpm for 20 minutes. The obtained mononuclear cells were seeded at 1 ⁇ 10 6 cells / well in a 96-well plate, and 100 ⁇ g / mL of recombinant GST or recombinant GST-L23a was added to the medium and cultured for 24 hours.
- Brefeldin A was added to 1 ⁇ g / mL 6 hours before the end of the culture to stop cytokine secretion. After the cells were collected, IL-17A and IFN- ⁇ were stained by a general cytokine staining method and detected with a flow cytometer.
- Anti-CCP antibody anti-cyclic citrullinated peptide antibody
- ELISA method Anti-L23a antibody was measured.
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Abstract
Description
[1]自己免疫性関節炎の発症または発症の見込みを判定する方法であって、被験者由来の試料中に存在する以下の(1)または(2)を検出することを特徴とする判定方法。
(1)リボソームタンパク質L23aに対する抗体
(2)リボソームタンパク質L23aと反応するCD4陽性T細胞
[2]リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である前記[1]に記載の判定方法。
[3]被験者が、抗CCP抗体陰性であることを特徴とする前記[1]または[2]に記載の判定方法。
[4]自己免疫性関節炎の発症または発症の見込みを判定するためのリボソームタンパク質L23aまたはそのフラグメントの使用であって、リボソームタンパク質L23aまたはそのフラグメントを用いてリボソームタンパク質L23aに対する抗体、またはリボソームタンパク質L23aと反応するCD4陽性T細胞を検出することを特徴とする使用。
[5]リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である前記[4]に記載の使用。
[6]リボソームタンパク質L23aのフラグメントが、配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする前記[4]に記載の使用。
[7]自己免疫性関節炎惹起性T細胞の活性化を抑制する物質のスクリーニング方法であって、リボソームタンパク質L23aと反応するT細胞に被験物質を接触させる工程、該T細胞にリボソームタンパク質L23aまたはそのフラグメントを接触させる工程、該T細胞の活性化状態を測定する工程、該T細胞の被験物質依存的な活性化状態の変化を分析する工程を含むことを特徴とするスクリーニング方法。
[8]前記T細胞の活性化状態を測定する工程において、該T細胞から分泌される炎症性サイトカイン、該T細胞の増殖、または該T細胞の活性化表面マーカーを測定することを特徴とする前記[7]に記載のスクリーニング方法。
[9]リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である前記[7]または[8]に記載のスクリーニング方法。
[10]リボソームタンパク質L23aのフラグメントが、配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする前記[7]または[8]に記載のスクリーニング方法。
[11]リボソームタンパク質L23aのフラグメントであって、配列番号1で示されるアミノ酸配列の一部からなり、配列番号1で示されるアミノ酸配列の少なくとも連続する5アミノ酸残基を含むことを特徴とするフラグメント。
[12]配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする前記[11]に記載のフラグメント。
本発明者らは、後段の実施例に示すように、SKGマウスを用いて自己抗体非依存的に関節炎を惹起するCD4陽性T細胞を見出し、当該CD4陽性T細胞の認識抗原を探索した結果、CD4陽性T細胞依存性の自己免疫性関節炎を惹起する自己抗原としてリボソームタンパク質L23aを同定した。さらにこの自己抗原について研究を進めた結果、本願発明を完成させた。
本発明は、自己免疫性関節炎の発症または発症の見込みを判定する方法を提供する。本発明の判定方法は、被験者由来の試料中に存在する(1)リボソームタンパク質L23aに対する抗体、または(2)リボソームタンパク質L23aと反応するCD4陽性T細胞を検出することにより行うことができる。
本発明の判定対象である自己免疫性関節炎は、自己抗体または自己反応性T細胞によって発症する関節炎であればどのような関節炎でもよい。例えば、関節リウマチ、反応性関節炎、乾癬性関節炎、強直性脊椎炎、膠原病関連関節炎などが挙げられる。好ましくは関節リウマチである。
被験者は特に限定されないが、関節炎を発症している者または関節炎の発症が疑われる者が好ましい。関節炎の発症が疑われる者としては、関節炎の自覚症状が認められる者が挙げられる。また、被験者は抗CCP抗体陰性であることが好ましい。具体的には、関節炎を発症しているが抗CCP抗体陰性の被験者、または関節炎の発症が疑われるが抗CCP抗体陰性の被験者であることが好ましい。
リボソームタンパク質L23a(以下「L23a」と記す)に対する抗体は、L23aに特異的に結合する抗体であればよい。L23aと反応するCD4陽性T細胞は、L23aと特異的に反応して活性化されるCD4陽性T細胞であればよい。
また、L23aのフラグメントは、L23aのアミノ酸配列(配列番号1)の第71位~第90位のアミノ酸配列(LDHYAIIKFPLTTESAMKKI、配列番号3)を含むフラグメントであることが好ましく、より好ましくは配列番号3で示されるアミノ酸配列からなるフラグメントである。
さらに、抗CCP抗体陰性の関節リウマチ患者血清の過半数にL23aに対する抗体が検出されたことから(実施例参照)、本発明の判定方法は、関節炎を発症しているが抗CCP抗体陰性の者または関節炎の発症が疑われるが抗CCP抗体陰性の者を対象とすることができ、これらの被験者における自己免疫性関節炎の発症または発症の見込みを判定できる点で、非常に有用である。
本発明は、自己免疫性関節炎惹起性T細胞の活性化を抑制する物質のスクリーニング方法を提供する。本発明のスクリーニング方法は、L23aと反応するT細胞に被験物質を接触させる工程、該T細胞にL23aまたはそのフラグメントを接触させる工程、該T細胞の活性化状態を測定する工程、該T細胞の被験物質依存的な活性化状態の変化を分析する工程を含むものであればよい。本発明のスクリーニング方法によって得られる物質は、自己免疫性関節炎の予防または治療薬の有効成分として有用である。
L23aと反応するT細胞(以下「L23a反応性T細胞」と記す)は、自己免疫性関節炎患者から、上記のL23aと反応するCD4陽性T細胞の検出方法に準じて採取することができる。また、L23a反応性T細胞は、L23aを特異的に認識するT細胞受容体遺伝子を、T細胞受容体を発現していないT細胞株(例えば5KC-73.8.20)に導入することにより、作製することができる(実施例参照)。
また、L23a反応性T細胞にL23aまたはそのフラグメントを接触させる工程において、L23a反応性T細胞にL23aまたはそのフラグメントを接触させる方法も特に限定されず、L23a反応性T細胞を培養している培地にL23aまたはそのフラグメントを添加する方法、L23a反応性T細胞を培養している培地をL23aまたはそのフラグメントを含有する培地と交換する方法などが挙げられる。
上記、本発明のスクリーニング方法を用いて得られる物質は、自己免疫性関節炎の予防または治療薬の有効成分として有用である。したがって、本発明には、L23a反応性T細胞の活性化を抑制する物質を有効成分とする自己免疫性関節炎の予防または治療用医薬が含まれる。
このようにして得られる製剤は安全で低毒性であるので、例えば、ヒトまたは哺乳動物(例えば、マウス、ラット、ウサギ、ヒツジ、ブタ、ウシ、ウマ、トリ、ネコ、イヌ、サル、チンパンジーなど)に対して経口的にまたは非経口的に投与することができる。
本発明は、L23aのフラグメントを提供する。本発明のフラグメントは、上記本発明の判定方法において、L23aに対する抗体の検出およびL23aと反応するCD4陽性T細胞の検出に用いることができる。また、本発明のフラグメントは、自己抗体非依存的に関節炎を惹起するCD4陽性T細胞の解析、自己抗体非依存的に関節炎のメカニズム解析等の基礎研究に用いることができる。
制御性T細胞の特異的転写因子であるFoxp3とEGFPとの融合蛋白質をコードする融合遺伝子をノックインしたefoxマウスを作製した。efoxマウスは、制御性T細胞をEGFPのシグナルによって簡便に検出することができる。このefoxマウスと、自己免疫性関節炎モデルマウスであるSKGマウスとを掛け合わせて、efoxSKGマウスを作製し、SPF環境下で飼育した。efoxSKGマウスは、約3か月間飼育後に関節炎を自然発症した。
T細胞、B細胞を欠損し、SKG変異を有するRAG2ノックアウトマウス(SKGマウスとRAG2ノックアウトマウスを掛け合わせて作製)へ150mg/kgの5-fluorouracilを腹腔内投与した。4日後に骨髄細胞を回収して、赤血球細胞を除いた。その後、IL-3(20ng/mL)、IL-6(40ng/mL)、SCF(50ng/mL)(ペプロテック)の存在下で、20%牛胎児血清、ペニシリン、ストレプトマイシン、2-ME添加DMEM溶液で骨髄細胞を2×106個/mLの濃度で培養した。培養2日目、3日目に、前記レトロウイルス含有上清にIL-3(20ng/mL)、IL-6(40ng/mL)、SCF(50ng/mL)およびポリブレン(4μg/mL)を添加した培地に交換した後、700g、32℃、90分間遠心することにより、レトロウイルスを骨髄細胞へ感染させた。培養4日目に、その骨髄細胞を、600rad放射線照射したRAG2ノックアウトマウスへ静脈内注射した。1種類のレトロウイルスをそれぞれ感染させたレトロジェニックマウスを約30種作製した。
作製したレトロジェニックマウスをSPF環境下で飼育し、関節炎を自然発症する個体を見出した。関節炎を発症したマウスの写真を図1(A)および(B)に示した。さらに、当該マウスに感染させたレトロウイルスを解析し、関節炎惹起性T細胞受容体のアミノ酸配列を特定した(図2参照)。図2中「14D-3/DV8*03」、「40*01」、「10*01」および「2-1*01」と示された配列は、例えばデータベースIMGT/LIGM-DB(http://www.imgt.org/ligmdb/)から取得することができる。
上記により見出した関節炎惹起性T細胞受容体の認識抗原の候補の絞り込みを以下のように行った。
まず、関節炎を起こすことを確認した上記のT細胞受容体遺伝子を、T細胞受容体を発現していない、T細胞株5KC-73.8.20へ、上記のレトロウイルスベクター含有上清を用いて同じ方法で遺伝子導入した。この細胞株は、T細胞受容体からの刺激によってIL-2を産生することが知られている。次に、BALB/cマウスの脾臓細胞から、MACSビーズ(ミルテニー社)により、CD11c+細胞、CD11b+細胞を、MACSシステムで濃縮、回収し、抗原提示細胞(APC)を調製した。
他方、関節炎を発症したSKGマウス関節滑膜細胞の細胞破砕液を調製し、NATIVE-PAGE法を用いて各バンドに分離し、各バンドを切り出してそれぞれに含まれるタンパク質を抽出した。
候補バンドからの抽出タンパク質を質量分析に供し、その結果から複数の候補タンパク質を絞り込んだ。
ヒトL23aをコードするDNA(配列番号2、ACCESSION:NM_000984)のコード領域を発現ベクターpGEX-6P1へ挿入した。この発現ベクターを大腸菌に導入し、LB培地を用いて37℃で培養した。0.1mMのIPTG存在下、25℃で5時間培養することによりタンパク質の発現を誘導した。その後、1%TritonX-100含有PBSを用いて細菌を溶解し、ソニケーションによりタンパク質を溶解させた。得られたタンパク質を、Glutathione-Sepharose fastflow beadsで精製し、組み換えGST-L23aを得た。コントロールとして用いるGSTの組み換えタンパク質は遺伝子導入していないpGEX-6P1ベクターから同様の方法で作製した。
結果を図3に示した。図3から明らかなように、GST-L23aは濃度依存的に関節炎惹起性T細胞受容体を活性化することが示された。
L23aのアミノ酸配列(配列番号1)に基づいて、約20アミノ酸残基からなる各種ペプチドを定法に従い合成した。上記のT細胞受容体遺伝子を導入したT細胞株、上記の抗原提示細胞(APC)、合成した各種のペプチドおよび上記組み換えGST-L23a(L23a全長)を用いて、上記と同様に、各細胞を96ウェルラウンドボトムプレートに播種し、ペプチドまたはGST-L23aを添加した培地を加えて24時間培養後、上清中のIL-2濃度を、ELISA(ebioscience)を用いて測定した。なお、ペプチドの濃度は50μg/mL、GST-L23aの濃度は100μg/mLとした。
図4に結果を示した。図4から明らかなように、L23a71-90が顕著にIL-2濃度を上昇させた。一方、L23a6-25はIL-2濃度を上昇させなかった。図に示していないが、L23a71-90以外のペプチドは、いずれもL23a6-25と同様の結果であった。この結果から、L23aの第71位~第90位のアミノ酸配列(LDHYAIIKFPLTTESAMKKI、配列番号3)からなるフラグメントが関節炎惹起性T細胞受容体の認識抗原であることが明らかとなった。
関節炎を発症したレトロジェニックマウス(L23aを認識する関節炎惹起性T細胞受容体発現レトロジェニックマウス)から採血し、血清を得た。
P3U1細胞破砕液、組み換えGST-L23aまたは組み換えGST-ヒストン1.2を2ME含有サンプルバッファーに添加し、95℃で5分間加熱した。15%のポリアクリルアミドゲルを用いて20mA75分間電気泳動し、その後90Vで30分間、Immobilon-P Transfer Membrane(Millipore)に転写した。転写した膜に200倍希釈した血清を反応させ、洗浄後、2次抗体としてHRP標識抗マウスIgG1抗体を2000倍希釈で反応させた。洗浄後、ECL Prime Western Blotting Detection Reagentを用いて発色させ、LAS-4000miniを用いて検出した。
なお、ヒストンH1.2は、今回クローニングした関節炎惹起性T細胞受容体の認識抗原候補に含まれていたが、反応性がないことが確認されたタンパク質であり、マウスヒストンH1.2をコードするDNA(ACCESSION:NM_015786)のコード領域を発現ベクターpGEX-6P1へ挿入し、GST-L23aと同様の方法でGSTタグを付加した組み換えタンパク質として調製した。
関節リウマチ患者374例、関節リウマチに罹患していない正常人80例から血液を採取し、血清を得た。
組み換えGST-L23aまたは組み換えGSTをPBSに溶解し、200ng/mLの溶液を調製した。ELISA用ポリソーププレート(商品名、Nunc)のウェルにそれぞれ添加して、4℃で16時間吸着させた。0.05%Tween20含有PBSで5回洗浄後、1%BSA含有PBSで1時間ブロッキングした。その後同様に5回洗浄し、1%BSA含有PBSで500倍に希釈した血清を100μLずつ各ウェルに添加した。室温で2時間放置し、5回洗浄した後、HRP標識抗ヒトIgG(H+L)(1%BSA含有PBSで4000倍に希釈したもの)を添加し1時間室温で放置した。5回洗浄した後、TMBを加えて15分後にOD450nmの値を測定した。GST-L23aのOD値からGSTのOD値を引いた値をL23aに対する抗体のOD値とした。
関節リウマチ患者1名から関節液を採取した。健常人1名から血液を採取した。それぞれ関節液および血液から単核球を分離した。具体的には、関節液または血液にフィコールを加え、2200rpmで20分間遠心して単核球を分離、回収した。得られた単核球を1×106個/ウェルで96ウェルプレートに播種し、培地に組み換えGSTまたは組み換えGST-L23aを100μg/mL添加して、24時間培養した。培養終了6時間前にBrefeldinAを1μg/mLとなるように加え、サイトカインの分泌を止めた。細胞を回収後、一般的なサイトカイン染色法によりIL-17AおよびIFN-γを染色し、フローサイトメーターで検出した。
抗CCP抗体(抗環状シトルリン化ペプチド抗体)は、関節リウマチ患者において陽性率が90%を超え、非常に感度の高い関節リウマチの診断マーカーとして広く用いられている。しかし、約10%の関節リウマチ患者では陰性であることが知られている。
そこで、抗CCP抗体陰性の関節リウマチ患者59例から血液を採取して血清を得、上記〔関節リウマチ患者血清における抗L23a抗体の検出〕に記載の方法(ELISA法)を用いて、血清中の抗L23a抗体を測定した。
Claims (12)
- 自己免疫性関節炎の発症または発症の見込みを判定する方法であって、被験者由来の試料中に存在する以下の(1)または(2)を検出することを特徴とする判定方法。
(1)リボソームタンパク質L23aに対する抗体
(2)リボソームタンパク質L23aと反応するCD4陽性T細胞 - リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である請求項1に記載の判定方法。
- 被験者が、抗CCP抗体陰性であることを特徴とする請求項1または2に記載の判定方法。
- 自己免疫性関節炎の発症または発症の見込みを判定するためのリボソームタンパク質L23aまたはそのフラグメントの使用であって、リボソームタンパク質L23aまたはそのフラグメントを用いてリボソームタンパク質L23aに対する抗体、またはリボソームタンパク質L23aと反応するCD4陽性T細胞を検出することを特徴とする使用。
- リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である請求項4に記載の使用。
- リボソームタンパク質L23aのフラグメントが、配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする請求項4に記載の使用。
- 自己免疫性関節炎惹起性T細胞の活性化を抑制する物質のスクリーニング方法であって、リボソームタンパク質L23aと反応するT細胞に被験物質を接触させる工程、該T細胞にリボソームタンパク質L23aまたはそのフラグメントを接触させる工程、該T細胞の活性化状態を測定する工程、該T細胞の被験物質依存的な活性化状態の変化を分析する工程を含むことを特徴とするスクリーニング方法。
- 前記T細胞の活性化状態を測定する工程において、該T細胞から分泌される炎症性サイトカイン、該T細胞の増殖、または該T細胞の活性化表面マーカーを測定することを特徴とする請求項7に記載のスクリーニング方法。
- リボソームタンパク質L23aが配列番号1で示されるアミノ酸配列からなるタンパク質である請求項7または8に記載のスクリーニング方法。
- リボソームタンパク質L23aのフラグメントが、配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする請求項7または8に記載のスクリーニング方法。
- リボソームタンパク質L23aのフラグメントであって、配列番号1で示されるアミノ酸配列の一部からなり、配列番号1で示されるアミノ酸配列の少なくとも連続する5アミノ酸残基を含むことを特徴とするフラグメント。
- 配列番号1で示されるアミノ酸配列の第71位~第90位を含むことを特徴とする請求項11に記載のフラグメント。
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