WO1998038216A1 - Molecule de surface cellulaire induisant l'adhesion cellulaire et la transmission de signaux - Google Patents
Molecule de surface cellulaire induisant l'adhesion cellulaire et la transmission de signaux Download PDFInfo
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- WO1998038216A1 WO1998038216A1 PCT/JP1998/000837 JP9800837W WO9838216A1 WO 1998038216 A1 WO1998038216 A1 WO 1998038216A1 JP 9800837 W JP9800837 W JP 9800837W WO 9838216 A1 WO9838216 A1 WO 9838216A1
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- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
- C07K14/70503—Immunoglobulin superfamily
- C07K14/70521—CD28, CD152
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/07—Animals genetically altered by homologous recombination
- A01K2217/075—Animals genetically altered by homologous recombination inducing loss of function, i.e. knock out
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
Definitions
- the present invention relates to a novel mammalian cell surface molecule, a polypeptide constituting the molecule and a fragment thereof, a fusion polypeptide composed of the polypeptide fragment and an immunoglobulin fragment, the polypeptide and the fragment encoding the same.
- a gene a vector containing the gene, a transformant into which the vector has been introduced, the polypeptide or an antibody having the reactivity of a cell surface molecule composed of the polypeptide, and a hybrid producing the antibody.
- the present invention relates to a pharmaceutical composition comprising the polypeptide fragment or the fusion polypeptide, a pharmaceutical composition comprising the antibody, a transgenic mouse, and a knockout mouse.
- Mammalian organisms have an immune response system that attempts to eliminate pathogenic microorganisms (viruses, bacteria, parasites, etc.) and foreign foreign substances (hereinafter collectively referred to as “antigens”) that have entered the body.
- One is called the innate immune response system and the other is called the adaptive immune response system.
- the former are phagocytosed by phagocytes (polymorphonuclear leukocytes, monocytes, macrophages, etc.), attacked by natural killer cells (NK), and non-specific, such as opsonization of antigen by complement. This is an exclusion mechanism based on recognition.
- lymphocytes mainly T cells and B cells
- B cells that have acquired antigen specificity attack the extracellular antigen by producing an antibody specific to the antigen.
- CTL cytotoxic lymphocytes
- the latter attacks cells infected with viruses by themselves (Experimental Medicine (separate volume) ⁇ "Bio Science Terminology Library I [Immunology]", Yodosha, p.14-17, 1995).
- T cells recognize antigens presented by antigen-presenting cells (APCs) such as macrophages, B cells or dendritic cells.
- APCs antigen-presenting cells
- MHC major histocompatibility complex
- T cells recognize the processed antigen presented by antigen presenting cells through a complex of T cell receptor (TcR) on the cell membrane surface and CD3 antigen (TcR / CD3 complex). Receive the first signal for cell activation (acquisition of specificity).
- the first signal through the TcR / CD3 complex does not only result in insufficient activation of T cells but also an unresponsiveness (unresponsiveness) that does not respond to any subsequent stimuli.
- Autoleukin (autocrine) of interleukin-12 (IL-2) is required to activate T cells and differentiate and proliferate into antigen-specific T cell clones.
- IL-2 production and cell division do not occur, and T cells are inactivated. That is, activation of T cells with the production of a site kinase such as IL-2 requires a second signal following the first signal via the TcR / CD3 complex. This second signal is called the costimulatory signal.
- T cells respond to this second signal by interacting (cell-cell adhesion) with a different molecule from MHC on antigen-presenting cells through a molecule different from the TcR / CD3 complex on the T cell surface. Receiving and transmitting into cells. This second signal causes the cell Cell paralysis is avoided and cells are activated.
- a cell surface molecule expressed on CD28 also known as Tp44, ⁇ 44, or 9.3 antigen
- CD80 also known as B7-l, ⁇ 7, ⁇ 1, or B7 / BB1
- CD86 also known as ⁇ 7-2 or ⁇ 70
- the control of the activation of ⁇ cells by the second signal includes the expression of CTLA-4 (Cytolytic T lymphocyte associated antigen 4), which is considered to increase its expression depending on the second signal. )
- CTLA-4 Cytolytic T lymphocyte associated antigen 4
- CD80 (B7-1) and CD86 (B7-2) also play an important role in cell-cell adhesion through binding between their molecules.
- the regulation of T cell activation by the transmission of the second signal includes at least the interaction between CD28 and CD80 / CD86, the enhancement of CTLA-4 expression which is considered to depend on the interaction, and It has been shown that the interaction between CTLA-4 and CD80 / CD86 is involved.
- CD28 has been shown to be a costimulator element that transmits a second signal (costimulatory 'signal) required for activation of this T cell and avoidance of xanadi.
- the second signal transmitted by the T cell stabilizes the mRNA for Thl-type cytokines, resulting in the production of large amounts of Thl-type cytokines such as IL-2, IFNy, and TNF from T cells. Prompt.
- CTLA-4 has been shown to respond to these signals and act to suppress T cell function as opposed to T cell activation by a second signal entering from CD28
- Human CD28 and CTLA-4 are type I glycoproteins with molecular weights of 44 kD and 41-43 kD, respectively. Both have a single immunoglobulin-like domain, belong to the immunoglobulin-perfume family, and have both functions as an intercellular adhesion molecule and a signal transduction molecule into cells.
- CD28 forms a homodimer through dizulphide binding
- CTLA-4 exists as a monomer.
- the positions of the genes for CD28 and CTLA-4 on the chromosome are both "2q33" in humans and “1C” in mice, and both consist of four exons.
- Human CD28 and CTLA-4 are composed of 22 and 23 amino acids, respectively, including the leader sequence, and their amino acid homology is about 20 to 30%.
- the ligands for CD28 and CTLA-4 have been shown to be CD80 (B7-1) and CD86 (B7-2) in humans and mice.
- CTLA-4 has a higher affinity for both ligands than CD28, with a difference of about 20-fold.
- MYP PPY Metal-Tyr-Pro-Pro-Pro-Tyr
- PI3K phosphoinositide 3 kinase
- CD28 plays an important role in intracellular signal transmission through this “YxxM” structure.
- CTLA4 also has the sequence represented by “YxxM”, that is, “YVKM (Tyr-Val-Lys-Met)”, and SYP associates with this sequence after stimulation. It has been shown.
- costimulators such as CD28, CD80 (B7-1) and CD86 (B7-2) in controlling T cell function (T cell activation and function suppression) and cooperating CTLA-4 etc.
- costimulators such as CD28, CD80 (B7-1) and CD86 (B7-2)
- T cell function T cell activation and function suppression
- cooperating CTLA-4 etc.
- the importance of interactions between multiple molecules in other words, cell-cell adhesion through bonding between those molecules
- Attempts to treat diseases by controlling the functions of these molecules have also attracted attention.
- a living body activates the acquired immune response system against antigens that are foreign to the living body (self), but does not show an immune response against its own biological component (self antigen). Have tolerance. However, when immune tolerance breaks down for some reason, an immune response to self-antigen occurs, and self-antigen-reactive T cells are induced by the same mechanism as described above, resulting in an immune abnormality and various autoimmune diseases. You.
- autoimmune diseases such as rheumatoid arthritis, multiple sclerosis, autoimmune thyroiditis, allergic contact dermatitis, and chronic inflammatory skin diseases such as lichen planus and psoriasis
- antigen-presenting cells in the focus of the disease Abnormal expression of CD80, a costimulatory molecule as a ligand for CD28 and CTLA-4, has been confirmed, and attempts to treat various autoimmune diseases in particular by suppressing the function of CD80 have been made. Much has been done.
- CTLA-4 As a method for blocking the function of CD80, a method using an antibody against CD80, a solubilized protein of CD28 which is a ligand of CD80, or a solubilized protein of CTLA-4 which is also a ligand of CD80 has been studied.
- the solubilized CTLA-4 which is based on the fact that the binding affinity of CTLA-4 to CD80 is at least 20 times higher than that of CD28, specifically the extracellular domain of CTLA-4 and human immunity
- Therapeutic trials using fusion proteins (CTLA-4-IgFc) consisting of the Fc region of globulin IgGl have been conducted in animal models and clinical trials (Japanese clinical study, Vol. 55, No. 6, No. 215). -220 pages, 1997).
- CTLA-4-IgFc fusion proteins consisting of the Fc region of globulin IgGl
- mice a model of human systemic lupus erythematosus (SLE), suppression of autoantibody production and onset of lupus nephritis by pre-symptomatic administration; Improvement of disease condition was observed (Science, Vol. 125, p. 1225-1227, 1994) o
- EAE allergic encephalomyelitis
- MS multiple sclerosis
- NOD non-obese diabetes
- IDDM insulin-dependent diabetes mellitus
- lymphocytes such as T cells
- lymphocyte activation by cell-cell adhesion through intermolecular binding that is involved in the transmission of a second signal essential for activation of lymphocytes such as T cells as described above.
- the elucidation of the mechanism of function control, and the identification and characterization of known or unknown molecules that have both the ability to mediate intercellular adhesion and the ability to transmit signals involved in that mechanism have been described earlier.
- it is possible to develop and provide a drug useful in the treatment or prevention of various diseases such as various autoimmune diseases, allergic diseases, and inflammatory diseases.
- an object of the present invention is to identify a novel cell surface molecule having both functions of mediating cell-cell adhesion and signaling, and to clarify its structural and biological properties. And Furthermore, another object of the present invention is to provide a medicament useful for treating or preventing various autoimmune diseases and inflammatory diseases by using the novel molecule or an antibody against the molecule.
- lymphocytes such as T cells play an important role in autoimmune diseases, Focusing on the fact that cell-cell adhesion is essential for signal transduction of the second signal (costi-mellitus signal) from cells into lymphocytes, it is specifically expressed in lymphocyte cells, In addition, the present inventors considered isolating and identifying a cell surface molecule having a function of mediating cell-cell adhesion.
- monoclonal antibodies against various cell surface molecules expressed on the surface of the lymphocyte cells are obtained by immunizing the lymphoid cells themselves, and cell-cell adhesion is obtained using the obtained monoclonal antibodies.
- the present inventors first administered a rat lymphocytic cell line as an immunogen to mice to produce various monoclonal antibodies.
- the obtained monoclonal antibody was allowed to act on rat lymphoid cells used as an immunogen, and the effect of the monoclonal antibody on the cells was examined.
- this monoclonal antibody had the property of strongly aggregating the rat lymphoid cells (this monoclonal antibody was named "JTT.l antibody”). Furthermore, in the same manner, among the prepared monoclonal antibodies, a monoclonal antibody that strongly inhibits the aggregation of rat lymphoid cells induced by the “JTT.l antibody” was found (this monoclonal antibody was referred to as “JTT.2 Antibody ").
- JTT-1 antibody an affinity column prepared by adsorbing "JTT-1 antibody” on the adsorbent
- the mixture of soluble cell surface molecules prepared from the rat lymphoid cells was used to obtain the "JTT-1 antibody”.
- the molecule to be trapped, ie, “JTT-1 antigen” was purified.
- the molecular weight of this purified “JTT-1 antigen” was analyzed by immunoprecipitation using “JTT-1 antibody” and “JTT-2 antibody” and SDS-PAGE.
- the molecules immunoprecipitated by each of the “JTT-1 antibody” and “JTT-2 antibody” are the same molecules, and the molecules are homodimers having different sugar chain modifications. I found it.
- the N-glycan when the N-glycan is not digested, it is identified as one molecule of about 47 kD in non-reduction, and as two molecules of about 24 kD and about 28 kD in reduction.
- the chain When the chain was digested, it was identified as one molecule of about 36 kD in non-reduction and as one molecule of about 20 kD in reduction.
- a cDNA library of lymphoblasts derived from rat spleen that had been intensified by ConA ij was expressed by the expression cloning method using the panning method using the “JTT.l antibody”.
- plaque hybridization using a cDNA encoding the obtained "rat JTT.1 antigen” as a probe a cDNA library of human peripheral blood lymphoblasts stimulated with ConA was used to obtain "human JTT.1 antigen”.
- “human JTT-1 antigen” was found to activate T cells through cell-cell adhesion as described in detail above.
- Important costimulatory signals “CD28”, a cell surface molecule of lymphocytes such as T cells that transmit signals, and T cells that control the function of activated lymphocytes such as activated T cells in conjunction with these signals It was found to have the following structural similarity to “CTLA-4”, a cell surface molecule of lymphocytes.
- the position of the gene encoding the mouse JTT-1 antigen on the mouse chromosome was analyzed using the fluorescence in situ hybridization (FISH) method. It was found that the position was "1C3", the same as the positions of "CD28” and "CTLA-4".
- JTT-2 antibody was used in the experimental allergic unilateral cerebrospinal cord.
- An experiment was performed in which the drug was administered to a model rat of nephritis (EAE) and glomerular basement membrane (GBM) nephritis.
- EAE nephritis
- GBM glomerular basement membrane
- a monoclonal antibody against the “human JTT-1 antigen” significantly proliferates human peripheral blood lymphocytes, and the proliferation receives the first signal from an antigen presenting cell, which is essential for T cell activation.
- TcR / CD3 complex on T cells It was discovered that higher proliferation was observed when a monoclonal antibody against the antibody coexisted, and the "JTT-1 antigen” was found to be a cell surface molecule involved in signal transduction to lymphocytes.
- JTT-1 antigen By analyzing the detailed functions of the "JTT-1 antigen", it is useful to develop "JTT-antigens" of other animal species useful for developing pharmaceuticals for the treatment of autoimmune diseases, allergic diseases and inflammatory diseases.
- the present invention provides a polypeptide, a gene, an antibody, a vector, a transformant, a pharmaceutical composition, a polypeptide related to the novel mammalian “JTT-1 antigen” isolated and identified as described above,
- the present invention relates to a transgenic mouse, a knockout mouse, and the like. Specifically, the present invention relates to the inventions described in the following (1) to (36).
- a polypeptide constituting a cell surface molecule having the following characteristics:
- an antibody reactive with the cell surface molecule induces proliferation of peripheral blood lymphocytes in the presence of an antibody reactive with CD3;
- polypeptide It has a partial amino acid sequence represented by Tyr-Met-Phe-Met in the intracellular region.
- the polypeptide has the amino acid sequence of SEQ ID NO: 2 or the amino acid sequence of SEQ ID NO: 2 in which one or several amino acids have been substituted, deleted or added.
- the polypeptide according to the above (1) which is characterized in that:
- polypeptide according to (1) wherein the polypeptide is encoded by a DNA that hybridizes under stringent conditions to DNA consisting of the nucleotide sequence of SEQ ID NO: 1. .
- polypeptide according to (1) wherein the polypeptide has an amino acid sequence having 60% or more homology with the amino acid sequence represented by SEQ ID NO: 2.
- the cDNA comprises a nucleotide sequence represented by nucleotide numbers 26 to 625 of SEQ ID NO: 3, a nucleotide sequence represented by nucleotide numbers 35 to 637 of SEQ ID NO: 4, a nucleotide sequence represented by nucleotide numbers 1 to 603 of SEQ ID NO: 5
- the gene according to the above (7) which comprises a sequence or any one of the nucleotide sequences of base numbers 35 to 685 of SEQ ID NO: 6.
- a homodimer molecule formed by binding a polypeptide fragment comprising the extracellular region of the polypeptide according to any one of (1) to (5) by a disulfide bond.
- a pharmaceutical composition comprising one or both of the polypeptide fragment according to (14) or the homodimer according to (17), and a pharmaceutically acceptable carrier.
- a fusion polypeptide comprising the extracellular region of the polypeptide according to any of (1) to (5) and a constant region or a part of a constant region of a heavy chain of human immunoglobulin (Ig). Beptide.
- a pharmaceutical composition comprising any one or both of the fusion polypeptide according to (22) or the homodimer molecule according to (24) and a pharmaceutically acceptable carrier.
- the effect on mitogen-stimulated lymphoblast cells shows the effect of monoclonal antibodies produced by the hybridoma identified by International Accession No.FERM BP-5707 on mitogen-stimulated lymphoblast cells. And a monoclonal antibody or a portion thereof which is substantially the same.
- the effect of the monoclonal antibody on lymphoblast cells stimulated with mitogen was stimulated with mitogen by a monoclonal antibody produced by a hybridoma identified by International Accession No.FERM BP-5708.
- a pharmaceutical composition comprising the monoclonal antibody or a part thereof according to the above (29) and a pharmaceutically acceptable carrier.
- a gene encoding the polypeptide of (1) which is derived from a human containing the nucleotide sequence of SEQ ID NO: 1 or a nucleotide sequence of SEQ ID NO: 4;
- a transgenic mouse characterized in that a rat-derived gene containing the nucleotide sequence to be inserted is incorporated into an endogenous mouse gene.
- polypeptide according to (1) which is a polypeptide derived from a mouse having an amino acid sequence encoded by the gene represented by SEQ ID NO: 5, so that the polypeptide is not produced.
- a knockout mouse wherein the endogenous gene of the encoding mouse is inactivated.
- the cell surface molecule of the present invention (that is, the “JTT-1 antigen”) is used for cell-cell adhesion through the molecule, signal transmission to lymphocytes such as T cells, and the function of activated lymphocytes. It has aspects that play a role in control. Therefore, general knowledge of lymphoid cells, intercellular adhesion molecules, and their relationship to disease is described below for the sole purpose of providing a general understanding of such biological events. Therefore, the general findings described below are not intended to limit the present invention. Lymphocytes are roughly divided into two types, T cells and B cells. Bone marrow pluripotent stem cells When lymphoid stem cells are differentiated from, some of them get into the thymus through the bloodstream.
- T cells Lymphocytes differentiated and matured in the thymus are called T cells (Thymus-derived cells: T cells) and enter the blood again and travel throughout the body.
- T cells Lymphocytes differentiated and matured in the thymus are called T cells (Thymus-derived cells: T cells) and enter the blood again and travel throughout the body.
- Mature T cells have a molecule called CD3 on their surface, and the presence of this molecule is a marker for distinguishing whether the cell is a mature T cell.
- CD3 is a powerful T cell marker.
- T cells express CD4 or CD8.
- T cells are also helper T cells (Th cells: helper T cells) that assist B-lymphocyte antibody production, and cytotoxic T cells (Tc cells: cytotoxic T cells: CTL) that attach to and destroy target cells directly ) Or killer T cells, subcellular T cells that suppress B-lymphocyte antibody production, and effector T cells that secrete effect substances such as lymphokines and cause delayed allergy.
- Th cells helper T cells
- Tc cells cytotoxic T cells: CTL
- killer T cells subcellular T cells that suppress B-lymphocyte antibody production
- effector T cells that secrete effect substances such as lymphokines and cause delayed allergy.
- B cells are directly differentiated and matured in bone marrow.
- B cells are cells that will produce antibodies when appropriately stimulated, and are precursor cells for producing antibodies.
- immunoglobulins synthesized in B cells which function as antigen receptors.
- Mature B cells have both IgM and IgD on the surface, and when stimulated by antigen and differentiated by signals from T cells, IgM production is increased and the C-terminal cell membrane junction is altered and secreted. . With sufficient stimulation, the surface immunoglobulin also changes to IgG, IgE, and IgA, and secretes each class of immunoglobulin.
- Immunoglobulins on the surface of B cells are sometimes called slg for surface Ig, or mlg for cell membrane Ig. All Igs on the surface of one B cell have the same antigen binding site.
- Lymphocytes that are neither T cells nor B cells are called LGL (laege granular lymphocute) or null cells. These cells have the ability to damage tumor cells and virus-infected cells, but unlike cytotoxic T cells, they do not need to be primed in advance. Therefore, it is also called natural killer cell (NK cell: natural killer cell).
- NK cell natural killer cell
- T cell antigen receptor TCR
- TCR tumor cell antigen receptor
- various biochemical changes occur in the cell, and a signal is transmitted to the nucleus, transcription of a specific DNA starts, and the respective proteins are synthesized.
- cell-level responses can be seen.
- CD8-positive T cells for example, considering a cell infected with a certain virus, the infected cell synthesizes a viral protein, and the protein is degraded by cytoplasmic proteasomes, and some peptides are converted to TAP.
- IL-2R IL-2 receptor
- CD4 + Thl cells CD4 + T cells secreting IL-2, IFNa, etc.
- CD8-positive T cells may produce IL-2 and others in response to antigens.
- MAC membrane attack complex
- T cells contains serine protease LLT, proteoglycan, and so on. When differentiated into CTL and stimulated with antigen, they also secrete lymphokines such as IFN, LT, TNF and IL-2. In addition, T cells respond to pan-haemagglutinin (plant agglutinin, PHA) ⁇ concanapalin A (Con A) and show blast formation. Mature T cells that have not been stimulated yet are called resting T cells, and have a small cell size and a short life span of several days. When stimulated, the cells grow larger, as already mentioned, and become more responsive to various stimuli. Such T cells are called activated T cells. Some activated T cells become memory T cells, which, when subjected to the same antigenic stimulation, will result in a secondary immune response. It is said that memory T cells have been circulating in the body for several years and for decades.
- B cells that have not been stimulated yet are called resting B cells, just like T cells, and proliferated when stimulated with a multivalent antigen or CD40L. Such B cells are called activated B cells.
- Resting phase B cells have no costimulatory molecules (molecules that stimulate T cells together with TCR-mediated signals) such as B7-1 (CD80) and B7-2 (CD86). It is said that even if an antigen is provided, it cannot stimulate the TCR to express CD40 ligand (CD40L) or produce lymphokine. Therefore, it is thought that activated T helper cells stimulated by other antigen-providing cells and activated respond to the antigen presentation of quiescent B cells.
- dendritic cells expressing B7 molecules activated in response to microorganisms present the antigen. It is thought that they stimulate quiescent helper T cells, activate them by expressing CD40L, and then stimulate CD40 by binding to quiescent B cells that present the same antigen.
- B cells Once activated by stimulation with a multivalent antigen or CD40L, B cells also express B7 molecules, stimulate CD28 on the surface together with TCR, activate their helper T cells, and express CD40L.
- Rin Focaine can be produced.
- B cells that have undergone a change such as the cells becoming larger due to stimulation but show little antibody secretion are called activated B cells.
- T cell stimulation stimulates the production of IgM, and the produced IgM changes from membrane to secretory and becomes secreted.
- humoral factors from T cells cause IgM to produce antibodies of other isotypes, such as IgG. This is called an isotype switch or a class switch.
- B cells that have secreted antibodies have come to be called antibody-secreting cells, and some have become morphologically distinct, and are called plasma cells (plasma cells). Knowledge of immunology, Ohmsha (1996)).
- the subpopulations of leukocytes ie, T lymphocytes, B lymphocytes, NK, neutrophils, etc.
- the same lymphocyte shows different dynamics depending on the state of the cell, that is, whether the cell is activated or in the stationary phase.
- Cell adhesion molecules are molecules that have the function of adhering cells to each other during the development and differentiation of an individual or during migration of cells to a local area. It is known to be an essential molecule for proper and functional communication.
- Cell adhesion molecules are broadly classified into five groups based on their structural characteristics: immunoglobulin-per-family, integrin family-one, secretin family, cadherin family-one, and CD44 family.
- Adhesion molecules belonging to the immunoglobulin super family are characterized by repeating loop-like domains formed by disulfide bonds, and are characterized by "ICAM-1” (intercellular adhesion molecule-1) s Molecules such as "VCAM-1" (vascular cell adhesion molecule-1) are known.
- Adhesion molecules belonging to the integrin family are characterized by a heterodimeric structure, such as "VLA-1-6" (very late antigen-1-6) and "LFA-1" (lymphocyte function-associated).
- N-force doherin and P-force doherin are known, and “CD44” is known in the CD44 family.
- adhesion molecules such as adhesion of leukocytes to vascular endothelial cells and adhesion of lymphocytes to antigen presenting cells. It has gradually become clear that it is also related to various diseases.
- SLE systemic lupus erythematosus
- adhesion molecules For example, in SLE patients, the ability of T lymphocytes to adhere to cultured vascular endothelial cells Has been reported to be lower than in healthy individuals.
- IFA-1 enhance "ICAM-1,”"VLA-4,” and "IFA-1" (Haskard, DO et al, Rheumatol. Int, 9, 33 (1989).
- the adhesion between hepatocytes and inflammatory cells is "ICAM-1", "LFA-3” and "LFA-1".
- Serum ⁇ ICAM-1 '' concentration in patients with acute hepatitis, chronic active hepatitis, and cirrhosis is higher than in healthy and chronic persistent hepatitis patients, and high values are found in histologically advanced patients among active hepatitis patients Therefore, it has been reported that serum CAM-1 in chronic liver disease correlates with the degree of hepatocyte damage (Mod. Phys. 15, (1), 73-76 (1995)).
- VCAM-1 is also expressed in human atherosclerotic lesions, and its expression is particularly strong in smooth muscle cells and monocytes / macrophages that have migrated to the intima. It has been reported that it was accepted. Increased expression of “MCP-1” has been observed in rabbit and human atherosclerotic lesions, suggesting that “MCP-1” promotes the formation of atherosclerotic lesions through migration of monocytes / macrophages. (Current Terabi, 12, (8), 1485-1488 (1994)).
- cancer metastasis there is a report on the relationship between cancer metastasis and abnormal adhesion molecules.
- cancer cells with reduced E-cadherin are highly invasive, but the introduction of E-cadherin cDNA suppresses the invasiveness, and the addition of E-cadherin antiserum restores the invasiveness.
- reduced expression of E-force doherin is closely associated with invasiveness of cancer cells (Frixen, UH, et al. 113, 173 (1991)).
- various cancers such as liver cancer, esophagus cancer, stomach cancer and breast cancer have a relationship between reduced E-cadherin expression and metastasis.
- VLA-4 a ligand of VCAM-1
- VLA-4 a ligand of VCAM-1
- epithelial cancers such as gastric cancer, colon cancer, lung cancer, liver cancer, and ⁇ cancer adhere to vascular endothelial cells via E-selectin (Takada , A., et al. Cancer Res., 53, 354 (1993)).
- mitogen is also called a mitogen and refers to a substance that induces cell division. Immunologically, it refers to antigen-specific (polyclonal) lymphocyte blasts that induce lymphocyte division. Examples include lectins such as PHA and PM, concanavalin A (Concanaval in A; ConA), lipopolysaccharide, streptolysin S, and anti-lymphocyte antibody. Concanapalin A and PHA are known to act only on T lymphocytes, lipopolysaccharide acts only on B lymphocytes, and PWM is known to act on both lymphocytes.
- lymphoblasts is also called large lymphocytes, lymphoblasts or immunoblasts, and refers to lymphoid tissues (lymph node, spleen, thymus, bone marrow, lymph) (Such as ducts and tonsils) and lymphocytes that exist in blood and belong to large lymphocytes.
- activated lymphocytes means, for example, but not limited to, the following lymphocytes.
- lymphocytes activated by some kind of stimulus.
- lymphocytes are classified into T cells, B cells, and natural killer cells, and T cells can be further classified into CD4-positive cells and CD8-positive cells. Therefore, the “activated lymphocytes” of the present invention mainly include activated T cells, activated B cells, and activated natural killer cells, and Activated T cells include activated CD4-positive cells and activated CD8-positive cells.
- CD4 positive ⁇ cells When CD4 positive ⁇ cells respond to the antigen presented by the antigen-providing cells, they secrete a variety of cytokines, newly express receptors for those cytokines, and the cells themselves grow larger. It begins to divide, proliferate and become activated. Activated CD4-positive ⁇ cells refer to CD4-positive ⁇ cells in such a state.
- CD8-positive ⁇ cells express IL-2R in response to antigen, differentiate into cytotoxic CTL when acted on by IL-2, and then meet the same antigen peptide / MHC class I complex When they do, they will destroy and kill their target cells.
- CD8-positive ⁇ cells differentiate into CTL, granules increase in the cytoplasm. These granules contain various macromolecular proteins, of which perforin is a representative. Perforin is similar to AC, composed of components 5-9 of complement, and has the effect of puncturing the cell membrane of target cells. It also contains serine protease II LT and proteoglycan. When differentiated into CTL and stimulated with antigen, they also secrete lymphokines such as IFN, LT, TNF or IL-2.
- Activated CD8 + T cells refer to CD8 + T cells in such a state.
- T cells respond to pan-haemagglutinin (plant agglutinin, PHA) ⁇ concanapalin A (Con A) and show a blast formation phenomenon. T cells in such a state are also included in activated T cells.
- B cells express the B7 molecule, stimulate CD28 on the surface together with the TCR to activate their helper T cells, express CD40L, produce lymphokines, and become larger when stimulated. Changes such as proliferation are observed.
- Activated B cells refer to B cells in such a state.
- activated B cells antibody-secreting cells
- plasma cells l is also included in activated B cells.
- Activated natural killer cells refer to natural killer cells that have a damaging effect on tumor cells and virus-infected cells as described above.
- thymocytes stimulated with concanavalin A are also included in the activated lymphocytes.
- the "lymphoblast” as described above is a lymphoblast activated by stimulation with the "mitogen” such as concanapalin A. Includes sphere.
- the “gene” in the present invention includes genomic DNA and cDNA.
- derived from a human refers to a natural substance isolated from a biological component (an organ, a tissue, a cell, a body fluid, or the like) of the human, or a recombinant substance produced using a genetic recombination technique.
- a biological component an organ, a tissue, a cell, a body fluid, or the like
- a recombinant substance produced using a genetic recombination technique When the substance is a protein or polypeptide, artificial proteins and polypeptides having an amino acid sequence in which one or several amino acid sequences in those amino acid sequences have been substituted, deleted or added are included. Peptides are included.
- the “cell surface molecule” of the present invention is a cell surface molecule derived from mammals such as human, rat, mouse, guinea pig and rabbit, and preferably a cell surface molecule derived from human, rat or mouse. And more preferably a human-derived cell surface molecule.
- the “cell surface molecule” of the present invention is specifically a cell surface molecule having at least the following properties.
- an antibody reactive with the cell surface molecule induces proliferation of peripheral blood lymphocytes in the presence of an antibody reactive with CD3;
- (e) It has a partial amino acid sequence represented by Tyr-Met-Phe-Met in the intracellular region.
- a preferred embodiment is a cell surface molecule composed of the “polypeptide” of the present invention described below.
- polypeptide of the present invention is a polypeptide constituting the above “cell surface molecule” of the present invention, and specific examples thereof include the following.
- amino acid sequence represented by SEQ ID NO: 2 or a polypeptide having an amino acid sequence substantially identical to the amino acid sequence ie, a polypeptide comprising a "human JTT-1 antigen” and its derivative
- polypeptide having an amino acid sequence encoded by the nucleotide sequence of base numbers 35 to 637 of SEQ ID NO: 4 or an amino acid sequence substantially identical to the amino acid sequence ie, “rat A polypeptide constituting the “JTT-1 antigen” and derivatives thereof.
- the “stringent conditions” include, for example, the following conditions.
- a guideline for the temperature (Tm) at which 50% of dissociation occurs is obtained from the following formula, and the hybridization is determined.
- the temperature of the chillon can be set as shown in the following formula.
- Tm 82.3 ° C + 0.41x (G + C)% —500 / n—0.61X (formamide)%
- Tm changes as shown in (1) and (2) below.
- Tm decreases by 0.6 to 0.7 ° C.
- the temperature conditions in the case of a combination of perfectly complementary strands can be as follows.
- the temperature condition in the case of a combination of incomplete complementary strands can be as follows.
- “having substantially the same amino acid sequence” means that the amino acid sequence in the amino acid sequence has substantially the same biological properties as the polypeptide having the amino acid sequence described in the sequence listing.
- Such amino acid substitutions, deletions, or insertions can be made according to a conventional method (eg, Experimental Medical Supplement “Genetic Engineering Handbook” (1992)).
- a synthetic oligonucleotide-directed mutagenesis method for example, a synthetic oligonucleotide-directed mutagenesis method (gapped duplex), a method of randomly introducing point mutations by nitrite or sulfurous acid treatment, a method of producing deletion mutants using Bal31 enzyme, etc., a cassette mutation method , Linker scanning method, misincorporation method, mismatch primer method, DNA segment synthesis method, and the like.
- the synthetic oligonucleotide-directed mutagenesis (gapped duplex) method can be performed, for example, as follows. A region desired to be mutagenized is cloned into an M13 phage vector having an amber mutation to prepare single-stranded phage DNA. RFIDNA of the M13 vector having no amber mutation is linearized by treatment with a restriction enzyme, mixed with the above single-stranded phage DNA, denatured, and annealed to form “gapped duplex DNA”. A synthetic oligonucleotide having a mutation introduced therein is hybridized, and a closed circular double-stranded DNA is obtained by a reaction between DNA polymerase and DNA ligase.
- This DNA is transfected into an Escherichia coli band tS strain deficient in mismatch modification ability, and the grown phage is infected with Escherichia coli having no sublesser function, and only the phage having no amber mutation Select
- the method of introducing a point mutation by nitrous acid uses the following principle, for example. Use.
- DNA is treated with nitrite, the base is deaminated, adenine becomes hypoxanthine, cytosine becomes peracil, and guanine becomes xanthine.
- hypoxanthine and cytosine form hypoxanthine and adenine and xanthine form a base pair with thymine at the time of DNA replication, so that "A: T" becomes "G: (;” Substitute “G: (:) for“ A: T.
- the single-stranded DNA fragment treated with nitrite is hybridized to rgapped duplex DNA, and
- the mutant strain may be isolated by the same operation as in the case of the gapped duplex method, and the three letters or one letter of the alphabet used to denote amino acids in the present specification or the drawings are as follows. Means the amino acid shown.
- polypeptide constituting the “cell surface molecule” of the present invention described above is a cell transmembrane protein that penetrates a cell membrane, and the “cell surface molecule” is constituted by one or two of the cell membrane penetrating polypeptides. You.
- transmembrane protein refers to a protein that is linked to the membrane by a hydrophobic peptide domain that penetrates the lipid bilayer once or several times, as found in many receptors and cell membrane surface molecules. It refers to a protein having a structure composed of three main regions: an extracellular region, a transmembrane region, and a cytoplasmic region as a whole.
- transmembrane proteins can be homodimers, heterodimers, or as monomers, or with another chain having the same amino acid sequence or a chain having a different amino acid sequence, respectively. It forms each receptor and cell surface molecule by being formed as a mouth dimer (or heterodimer) or an oligomer (origomer).
- polypeptide fragment of the present invention is a polypeptide fragment of the “polypeptide” of the present invention as defined above, and is preferably an extracellular region of the polypeptide.
- the region may have 1 to 5 amino acids added to its N-terminus and / or C-terminus as desired.
- extracellular region refers to all or one of the partial structures (partial regions) existing on the outer side of the membrane to which the membrane protein is linked, of the entire structure of the cell membrane transmembrane protein as described above. In other words, all or part of the region other than the region taken up in the membrane (transmembrane region) and the region present in the cytoplasm following the region in the membrane (intracellular region) Means
- the constant region or part of the constant region of the heavy chain of human immunoglobulin refers to the constant region of the heavy chain (Heavy Chain, H chain) of human immunoglobulin as described above.
- the immunoglobulin may be of any class and subclass, specifically, IgG (IgGl, IgG2, IgG3 and IgG4), IgM, IgA. (IgA1 and IgA2), IgD and IgE.
- IgG IgGl, IgG2s IgG3 or IgG4
- a particularly preferred example in the present invention is an immunoglobulin belonging to human-derived IgG (IgGl, IgG2, IgG3 or IgG4).
- Immunoglobulins are composed of four homologous light chains (Light chains, L chains) and two homologous heavy chains (Heavy chains, H chains) linked by disulfide bonds (SS bonds). It has a letter-shaped structural unit.
- the light chain is composed of a light chain variable region (VL) and a light chain constant region (CL).
- Heavy chains are comprised of a heavy chain variable region (VH) and a heavy chain constant region (CH).
- the heavy chain constant region, class (I gG, I gM, I gA, IgD and I gE) subclasses as well (I gGl, I gG2 s I gG3, I gG4, I gAl and I gA 2) each specific to each It is composed of several domains having an amino acid sequence.
- the heavy chain of IgG (IgG I IgG2, IgG3 and IgG4) is composed of VH, CHI domain, hinge region, CH2 domain and CH3 domain in order from the N-terminus.
- the heavy chain of similarly I GGL is this order from N terminus, VH, CYi l domain, hinge area, and a Cy! 2 domain, and C 7 l 3 domain.
- the heavy chain of I gG2 are in this order from N terminus, VH, C ⁇ 2 1 domain, hinge region, and a C ⁇ 2 2 domain, and C ⁇ 2 3 domain.
- the heavy chain of IgG3 is this order from N terminus, VH, C ⁇ 3 1 domain, hinge region, Ru consists Cy 3 2 domain, and 3 3 domain.
- the heavy chain of I GG4 are in this order from N terminus, VH, C ⁇ 4 1 domain, hinge region, and a Cr 4 2 domain, and C ⁇ 4 3 domain.
- the IgA heavy chain is composed of VH, C1 domain, hinge region, C2 domain and C3 domain in order from the N-terminus.
- the heavy chain of IgAl is composed of VH, Cc ⁇ l domain, hinge region, Cc2 domain and Cc3 domain in order from the N-terminus.
- the heavy chain of I GA2 are in this order from N terminus, VH, C monument 2 1 domain, hinge region, and a C monument 2 2 domain, and C monument 2 3 domain.
- the heavy chain of IgD is composed of VH, C (51 domains, hinge region, 2 domains, and C33 domain in order from the N-terminus.
- the heavy chain of IgM is composed of, in order from the N-terminus, VH, Cl domain, domain, C ⁇ 3 domain and C4 domain, and does not have a hinge region as found in IgG, 18 and 10. .
- the heavy chain of IgE is composed of VH, Cell domain, Ce2 domain, Cp3 domain and Cp4 domain in order from the N-terminus, and is composed of IgG, 18 and 1 ⁇ 0. It does not have a hinge region as seen.
- IgG when IgG is treated with papain, it is cleaved slightly at the N-terminal side of the disulfide bond present in the hinge region connecting the two heavy chains to VH and CH1.
- a heavy chain fragment and a light chain are linked by a disulfide bond
- two homologous Fab fragments consisting of a hinge region, CH2 domain, and CH3 domain are linked by a disulfide bond.
- a part of the constant region of the heavy chain of immunoglobulin in the present invention means a part of the constant region of the heavy chain of immunoglobulin having the structural characteristics as described above, It is a constant region or Fc region lacking one domain.
- each hinge region a region consisting of a C2 domain and a C3 domain is mentioned, and in the case of IgM or IgE, each C2 Domain, a C3 domain and a C4 domain.
- Particularly preferred examples include the Fc region of human IgG1.
- the “fusion polypeptide” of the present invention refers to the extracellular region of the “polypeptide” constituting the “cell surface molecule” of the present invention and “human immunoglobulin (Ig)” as defined above. Or a part of the constant region of the heavy chain of the present invention. " It is preferably a fusion polypeptide of the extracellular region of the polypeptide of the present invention and a part of the constant region of the heavy chain of human IgG, and particularly preferably the extracellular region of the polypeptide of the present invention and human I It is a fusion polypeptide with the region (Fc) consisting of the hinge region, the CH2 domain and the CH3 domain of the heavy chain of gG. Note that IgG is preferably IgGl.
- the polypeptide of the present invention is preferably a polypeptide derived from human, mouse or rat (preferably human).
- the fusion polypeptide of the present invention is used for the constant region of immunoglobulin such as IgG as described above. Since a portion of the region (for example, F c) is used as a fusion partner, the fusion can be performed by using affinity-column chromatography using the property of protein A, which specifically binds to the immunoglobulin fragment. It has the advantage that the polypeptide can be purified very easily. Furthermore, since various antibodies against Fc of various immunoglobulins are provided, the immunopolyassay of the fusion polypeptide can be easily performed using an antibody against Fc.
- immunoglobulin such as IgG as described above. Since a portion of the region (for example, F c) is used as a fusion partner, the fusion can be performed by using affinity-column chromatography using the property of protein A, which specifically binds to the immunoglobulin fragment. It has the advantage that the polypeptide can be purified very easily. Furthermore, since various antibodies against Fc of various immunoglobulin
- polypeptides, polypeptide fragments and fusion polypeptides of the present invention can be obtained by a known method known in the technical field such as a chemical synthesis method, a cell culture method, or the like, in addition to a genetic recombination technique described later. It can be produced by appropriately using the modification method.
- the “gene” of the present invention is a gene consisting of DNA encoding the above-described polypeptide or polypeptide fragment of the present invention, and has any nucleotide sequence capable of encoding the polypeptide or polypeptide fragment of the present invention. And genes having the same.
- a specific embodiment is a gene encoding the following polypeptide or a polypeptide fragment thereof.
- amino acid sequence represented by SEQ ID NO: 2 or a polypeptide having an amino acid sequence substantially identical to the amino acid sequence ie, a polypeptide comprising a "human JTT-1 antigen” and its derivative
- amino acid encoded by the nucleotide sequence of nucleotides 35 to 637 of SEQ ID NO: 4 A polypeptide having an amino acid sequence or an amino acid sequence substantially identical to the amino acid sequence (that is, a polypeptide constituting the “rat JTT-1 antigen” and derivatives thereof).
- More specific embodiments include the following DNAs or fragments thereof.
- a DNA consisting of the nucleotide sequence of SEQ ID NO: 1, and a DNA that hybridizes to the DNA under stringent conditions.
- a DNA comprising the nucleotide sequence of any one of SEQ ID NO: 4 and nucleotides 35 to 637.
- (6) a DNA comprising the nucleotide sequence of any of nucleotides 1 to 603 of SEQ ID NO: 5.
- a DNA comprising the nucleotide sequence of SEQ ID NO: 6 from nucleotides 35 to 685.
- the DNA encoding a part of the constant region of the heavy chain of immunoglobulin, which is a part of the fusion polypeptide in the present invention may be cDNA, It may be a genomic DNA containing an intron between each exon (eg, DNA encoding the CHI domain, hinge region, CH2 domain, CH3 domain, CH4 domain, etc.).
- DNAs composed of any codons that encode the same amino acid are included.
- the DNA of the present invention may be obtained by any method.
- complementary DNA cDNA prepared from mRNA
- DNA prepared from genomic DNA DNA obtained by chemical synthesis
- DNAs that are constructed by appropriately combining the above cDNA
- DNA encoding the polypeptide of the present invention can be prepared by a method of cloning cDNA from mRNA of the polypeptide of the present invention, a method of isolating and splicing genomic DNA, or a chemical synthesis according to a conventional method. It can be obtained by a method or the like.
- the following method is exemplified as a method for cloning cDNA from mRNA of the polypeptide of the present invention.
- mRNA encoding the polypeptide of the present invention is prepared from a tissue or cell that expresses and produces the cell surface molecule (polypeptide) of the present invention (for example, thymocytes or ConA-stimulated spleen-derived lymphoblast cells).
- mRNA was prepared by a known method such as the guanidine thiosinate method (Chirgwin JM et al, Biochemistry, Vol. 18, p. 5294, 1979), the hot phenol method or the AGPC method. It can be performed by subjecting the total RNA to affinity chromatography using oligo (dT) cellulose or poly-U-Sepharose.
- the obtained mRNA is used as type ⁇ , and a known method such as, for example, using reverse transcriptase, for example, the method of Okayama et al. (Mol. Cell. Biol., Vol. 2, p. 161, 1982 and the same magazine, Vol. 3, pp. 280, 1983 and the method of Hoffman et al. (Gene, Vol. 25, 263) Page, 1983), and convert cDNA into double-stranded cDNA.
- a cDNA library is prepared by incorporating this cDNA into a plasmid vector, phage vector or cosmid vector and transforming Escherichia coli or, after in vitro packaging, transfecting Escherichia coli (transfecting). I do.
- the plasmid vector used here is not particularly limited as long as it can be replicated and maintained in the host, and the phage vector used can be any vector that can be propagated in the host.
- Examples of commonly used cleaning vectors include pME18S, ⁇ (1ZAPI I), pUC19, et gtlO, and human gtll.
- the vector be a vector having a promoter capable of expressing the gene encoding the polypeptide of the present invention in the host.
- Methods for incorporating cDNA into plasmid include, for example, the method of Maniais is et al. (Molecular Cloning, A Laboratory Manual, second edition); And the method described in Cold Spring Harbor Laboratory, page 1.53, 1989.
- a method for incorporating cDNA into a phage vector the method of Hyunh et al. (DNA Cloning, a practical approach), Vol. 1, p. 49, p. 85 years).
- a commercially available cleaning kit for example, Takara Shuzo
- the recombinant plasmid phage vector thus obtained is introduced into an appropriate host such as a prokaryotic cell (for example, E.c01 ⁇ : XLlBlue MRF ⁇ DH5, HB101 or MC1061 / P3). .
- a prokaryotic cell for example, E.c01 ⁇ : XLlBlue MRF ⁇ DH5, HB101 or MC1061 / P3
- Methods for introducing a plasmid into a host include (Molecular Cloning, A Laboratory Manual, second edition), Cold Spring Harbor, and Laboratory (Cold Spring Harbor). Laboratory), page 1.74, 1989), the calcium chloride method, the calcium chloride / rubidium chloride method, the electro-volatilization method, and the like.
- Examples of a method for introducing a phage vector into a host include a method in which phage DNA is packaged in an in vitro manner, and then introduced into a grown host. In vitro packaging can be easily performed by using a commercially available in vitro packaging kit (for example, product of Stratra Gene, Amersham, etc.).
- the method of isolating the cDNA encoding the polypeptide of the present invention from the cDNA library prepared by the above method can be performed by combining general cDNA screening methods.
- oligonucleotide which is considered to correspond to the amino acid sequence of the polypeptide of the present invention
- labeling the oligonucleotide with 32 P to form a probe a known colony hybridization method ( Crunstein et al., Proceedings of the National Academy of Sciences (Proc. Nat 1. Acid. Sci. USA), Vol. 72, pp. 3961, 1975) or the plaque hive U.
- a method for screening a clone containing a cDNA of interest, a PCR primer examples include a method of amplifying a specific region of a peptide by a PCR method and selecting a clone having a DNA fragment encoding the region.
- a cDNA library prepared using a vector capable of expressing cDNA for example, human ZAPII phage vector 1
- an antigen-antibody reaction using an antibody reactive with the polypeptide of the present invention may be used.
- the target clone can be selected using.
- the nucleotide sequence of DNA obtained in this manner is based on the Maxam-Gilbert method (Maxam Natl. Acad. Sci. USA., Vol. 74, p. 560, 1977) or a method for terminating dideoxynucleotide synthesis using phage M13 (Sanger et al. Proc. Natl. Acad. Sci. USA., Vol. 74, Vol. 546
- the gene encoding the polypeptide of the present invention can be obtained by cutting out all or a part of the clone obtained as described above using a restriction enzyme or the like.
- the cells are preferably lysed using SDS or proteinase K, and the extraction with phenol is repeated to deproteinize DNA.
- the RNA is preferably digested with ribonuclease.
- the obtained DNA is partially digested with an appropriate restriction enzyme, and the obtained DNA fragment is amplified with an appropriate phage or cosmid to prepare a library.
- a clone having the target sequence is detected by, for example, a method using a radiolabeled DNA probe, and all or a part of the gene encoding the polypeptide of the present invention from the clone is subjected to restriction enzyme or the like. To get the clipping.
- cDNA encoding human-derived polypeptide In order to obtain cDNA encoding human-derived polypeptide, a cosmid dry slurry into which human genomic DNA (chromosomal DNA) has been introduced is further prepared ("Labor Manual Human Genome Mapping", Maruzen Publishing). By screening a Kosumi Dry Rally, a positive clone containing DNA of the coding region of the target protein is obtained, and the above-mentioned cDNA library is screened using the coding DNA cut out from the positive clone as a probe. Can also be prepared.
- the DNA of the present invention can be produced by chemical synthesis according to a conventional method based on the nucleotide sequence of SEQ ID NO: 1, 3, 4.5 or 6. Further, the present invention encodes the above-mentioned cell surface molecule (polypeptide) of the present invention. It relates to a recombinant vector containing DNA.
- the recombinant vector of the present invention is not particularly limited as long as it can replicate and maintain or proliferate in various prokaryotic and / or eukaryotic host cells, and includes a plasmid vector and a phage vector. Is done.
- the recombinant vector can be conveniently obtained by ligating a DNA encoding the polypeptide of the present invention to a recombinant vector (plasmid DNA and bacterial phage DNA) available in the art in a conventional manner. Can be prepared.
- a recombinant vector plasmid DNA and bacterial phage DNA
- the recombinant vector used include plasmids derived from Escherichia coli, such as pBR322, pBR325, pUC12, pUC13, and pUC19, and plasmids derived from yeast, such as pSH19 and pSH15, and plasmids derived from Bacillus subtilis.
- pUB110, pTP5, pC194 and the like are exemplified.
- the phage include bacterium phage such as human phage, and animal and insect viruses (pVL1393, manufactured by Invitrogen) such as retrovirus, hexini
- Expression vectors are useful for expressing DNA encoding the polypeptide of the present invention to produce the polypeptide of the present invention.
- the expression vector is not particularly limited as long as it expresses the gene encoding the polypeptide of the present invention in various prokaryotic and / or eukaryotic host cells and has a function of producing these proteins. Not done. For example, pEFneo (Proc. Natl. Acad. Sci. USA, 91, 158-162, 1994), pEF-BOS (Nucleic Acid Research, 18, 5322, 1990), pME18S (Experimental Medicine Supplement “Genetic Engineering Handbook”, 1992) or pMAL C2.
- the expression vector When a bacterium, particularly Escherichia coli, is used as a host cell, the expression vector generally includes at least a promoter / operator region, an initiation codon, a DNA encoding the polypeptide of the present invention, a stop codon, and an enzyme. It consists of an overnight area and replicable units.
- the expression vector When using yeast, animal cells or insect cells as hosts, the expression vector is low. It is preferable to contain at least one start codon, a DNA encoding the polypeptide of the present invention, and a stop codon.
- DNA encoding a signal peptide, an enhancer sequence, untranslated regions at the 5 and 3 sides of the gene encoding the polypeptide of the present invention, a splicing junction, a polyadenylation site, and a selection marker It may include an area or a copyable unit. Further, it may contain a gene amplification gene (marker 1) which is usually used for the purpose.
- the promoter / operator overnight region for expressing the polypeptide of the present invention in bacteria includes a promoter, an operator and a Shine-Dalgarno (SD) sequence (for example, AAGG).
- SD Shine-Dalgarno
- promoters for expressing the polypeptide of the present invention in yeast include PH05 Promoter, PGK promoter, GAP promoter, and ADH promoter, and when the host is Bacillus, SL01 Promo One, SP02 Promoter, penP Promo One, and the like.
- the host is a eukaryotic cell such as a mammalian cell
- examples thereof include an SV40-derived promoter, a retrovirus promoter, a heat shock promoter, and an EF promoter.
- it is SV-40, SR or retrovirus.
- the use of enhansa is also an effective method for expression.
- Suitable initiation codons include methionine codon (ATG).
- Examples of the stop codon include commonly used stop codons (eg, TAG, TGAs TAA, etc.).
- evening / mine / night area a commonly used natural or synthetic evening / mine scene can be used.
- a replicable unit is the ability to replicate its entire DNA sequence in a host cell.
- Suitable plasmids include the plasmid pBR322 in E. coli or an artificially modified product thereof (a DNA fragment obtained by treating pBR322 with an appropriate restriction enzyme), and the yeast 2 ⁇ plasmid or the yeast in yeast.
- yeast chromosomal DNA examples include yeast chromosomal DNA, and mammalian cells include plasmids pEFneo, pME18S, pRSVneo ATCC 37198, plasmid pSV2dhfr ATCC 37145, plasmid pdBPV-MMTneo ATCC 37224, and plasmid pSV2neo ATCC 37149.
- polyadenylation site and splicing junction site those commonly used by those skilled in the art, such as those derived from SV40, for example, can be used.
- commonly used ones can be used by a conventional method.
- examples thereof include an antibiotic resistance gene such as tetracycline, neomycin, ambicilin, and kanamycin, and a thymidine kinase gene.
- Gene amplification genes include the dihydrofolate reductase (DHFR) gene, the thymidine kinase gene, the neomycin resistance gene, the glutamate synthase gene, the adenosine deminase gene, the orditin decarboxylase gene, and the human gene. Examples include the glomycin-B-phosphotransferase gene and the aspartate trans-rubamylase gene.
- DHFR dihydrofolate reductase
- thymidine kinase gene the neomycin resistance gene
- glutamate synthase gene the glutamate synthase gene
- the adenosine deminase gene the orditin decarboxylase gene
- human gene examples include the glomycin-B-phosphotransferase gene and the aspartate trans-rubamylase gene.
- the expression vector of the present invention comprises at least the following promoter, initiation codon, DNA (gene) encoding the polypeptide of the present invention, termination codon, and evening mine—appropriate continuous and circular appropriate replication. It can be prepared by linking to possible units. At this time, if necessary, an appropriate DNA fragment (for example, a linker, another restriction site, etc.) can be used by a conventional method such as digestion with a restriction enzyme or ligation using T4 DNA ligase.
- the transformed cell of the present invention is obtained by introducing the above-described expression vector into a host cell. Can be prepared.
- the host cell used in the present invention is not particularly limited as long as it is compatible with the above-described expression vector and can be transformed.Natural cells or artificially established cells usually used in the technical field of the present invention are used. And various cells such as recombinant cells (eg, bacteria (genus Escherichia, genus Bacillus), yeasts (genus Saccharomyces, genus Pichia), animal cells or insect cells).
- recombinant cells eg, bacteria (genus Escherichia, genus Bacillus), yeasts (genus Saccharomyces, genus Pichia), animal cells or insect cells).
- Escherichia coli or animal cells are preferred. Specifically, Escherichia coli (DH5 cells, XLlBlue MRF ⁇ TB1, HB101, etc.), mouse-derived cells (COP, L, C127, Sp2 / 0, NS-1) Or NI H3 T3, etc.), Rat-derived cells, Hamus Yuichi-derived cells (BHK, CH0-K1, and CHO, etc.), Monkey-derived cells (COS1, COS3, COS7, CV1, and Ve1o, etc.) And human-derived cells (HEK293, Hela, cells derived from diploid fibroblasts, myeloma cells, Namalwa, etc.).
- Escherichia coli DH5 cells, XLlBlue MRF ⁇ TB1, HB101, etc.
- mouse-derived cells COP, L, C127, Sp2 / 0, NS-1) Or NI H3 T3, etc.
- Rat-derived cells Hamus Yuichi-derived cells (BHK,
- Introduction (transformation (transfection)) of an expression vector into a host cell can be performed by a conventionally known method.
- insects In the case of cells, for example, by the method of Summers et al. (Mol. Cell. Biol., Vol. 3, pp. 2156-2165, 1983). Zorekatachi You can change the quality.
- the polypeptide of the present invention can be produced by culturing a transformed cell containing the expression vector prepared as described above (hereinafter, used to encompass a transfectant) in a nutrient medium. .
- the nutrient medium preferably contains a carbon source, an inorganic nitrogen source or an organic nitrogen source necessary for the growth of the host cell (transformant).
- carbon sources include glucose, dextran, soluble starch, and sucrose.
- inorganic or organic nitrogen sources include ammonium salts, nitrates, amino acids, corn starch, peptone, casein, and the like. Examples include meat extract, soybean meal, and potato extract.
- other nutrients eg, inorganic salts (eg, calcium chloride, sodium dihydrogen phosphate, magnesium chloride)
- vitamins antibiotics (eg, tetracycline, neomycin, ampicillin, kanamycin, etc.) are included. May be.
- the culturing is performed by a method known in the art. Culture conditions, for example, temperature, pH of the medium, and culture time are appropriately selected so that the polypeptide of the present invention is produced in large quantities.
- a liquid medium containing the above-mentioned nutrient is suitable.
- the medium has a pH of 5 to 8.
- preferred mediums include LB medium and M9 medium (Miller, et al., Exp. Mol. Genet Cold Spring Harbor Laboratory ⁇ p. 431, 1972). Is exemplified. In such a case, the culture can be carried out usually at 14 to 43 ° C. for about 3 to 24 hours with aeration and stirring as necessary.
- the reaction can be carried out usually at 30 to 40 ° C. for about 16 to 96 hours with aeration and stirring as necessary.
- the medium includes, for example, Burkholder minimum culture (Bostian, Proc. Natl. Acad. Sci. USA, Vol. 77, p. 4505, 1980), and the pH is 5 to It is desirable to be 8.
- the cultivation is usually performed at about 20 to 35 ° C for about 14 to 144 hours, and if necessary, aeration and stirring can be performed.
- MEM medium containing about 5 to 20% fetal bovine serum (Science, Vol. 122, p.
- the pH of the medium is preferably about 6 to 8, and the cultivation is usually carried out at about 30 to 40 ° C for about 15 to 72 hours, and if necessary, aeration and stirring can be carried out.
- the polypeptide of the present invention enables high expression of a target molecule on the cell surface by culturing the above-mentioned transformed cells, particularly animal cells.
- the transformant when the polypeptide of the present invention is produced as a soluble polypeptide fragment such as an extracellular region fragment, the transformant is transformed as described above using the DNA encoding the extracellular region or each domain. It can be prepared by culturing the exogenous transformant and secreting it into the culture supernatant. Further, the fusion polypeptide of the present invention can be produced in the same manner.
- a culture filtrate (supernatant) is obtained from the obtained culture by a method such as filtration or centrifugation, and the present invention is subjected to a conventional method generally used for purifying and isolating a natural or synthetic protein from the culture filtrate. Purification of the polypeptide or polypeptide fragment of Isolate.
- isolation and purification methods include methods using solubility such as salting out and solvent precipitation, and methods using molecular weight differences such as dialysis, ultrafiltration, gel filtration, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis.
- Ion-exchange chromatography a method that uses charge such as hydroxyapatite chromatography, a method that uses specific affinity such as affinity chromatography, and a method that uses differences in hydrophobicity such as reversed-phase high-performance liquid chromatography.
- a method utilizing isoelectric point difference such as isoelectric focusing.
- the culture is subjected to a conventional method such as filtration or centrifugation to separate the cells or cells.
- the cells are collected and suspended in an appropriate buffer, and the cell walls and / or cell membranes of the cells and the like are disrupted by, for example, ultrasonic lysozyme and freeze-thawing, followed by centrifugation or filtration.
- a membrane fraction containing the peptide is obtained.
- the membrane fraction is solubilized using a surfactant such as Triton-X100 to obtain a crude solution. Then, the crude solution can be isolated and purified by using a conventional method as exemplified above.
- the “transgenic mouse” in the present invention is a DNA (cDNA or genomic D) encoding a polypeptide (non-self polypeptide) of an animal species other than the mouse of the present invention, which can be prepared according to the method described above.
- NA is a transgenic mouse integrated into the endogenous locus of the mouse, and the transgenic mouse expresses and secretes the non-self polypeptide in the body.
- the transgenic mouse can be prepared by a conventional method commonly used in the production of transgenic animals (for example, the latest manual for animal cell experiments, L. A.I.-Sci., Chapter 7, Chapters 361-1 to 4). (See p. 08, 1990).
- an embryonic stem cell obtained from a normal mouse blastcyst (blastcyst) can be used, for example, to express a human-derived polypeptide of the present invention (ie, “human JTT- Transformation is carried out using an expression vector into which a gene encoding 1) has been inserted.
- ES cells in which the gene encoding the human-derived polypeptide of the present invention has been integrated on an endogenous gene are selected by a conventional method.
- the selected ES cells are microinjected into fertilized eggs (pulmonary blastocysts) obtained from another normal mouse (Proc. Natl. Acad. Sci. USA, Vol. 77, No. 12, pp. 7380-7384). , 1980; U.S. Pat. No. 4,873,191).
- the blastocyst is transplanted into the uterus of another normal mouse as a foster mother.
- a founder mouse (child mouse) is born from the foster parent mouse.
- a heterotransgenic mouse is obtained by crossing the founder mouse with a normal mouse. By crossing the heterogeneic transgenic mice, homogenic transgenic mice can be obtained according to Mendel's law.
- the “knockout mouse” of the present invention is a mouse in which an endogenous gene encoding a mouse-derived polypeptide of the present invention (that is, “mouse JTT-1 antigen”) has been knocked out (inactivated).
- Natl. Acad. US Pat. Nos. 5,464,764, 5,487,992, 5,627,059, and Proc. Natl. Acad.). USA, Vol. 86, 8932-89 35, 1989, Nature, Vol. 342, 435-438, 1989).
- the “antibody” in the present invention means a polyclonal antibody (antiserum) or a monoclonal antibody, and is preferably a monoclonal antibody.
- the “antibody” of the present invention includes cells expressing the “cell surface molecule” of the present invention (natural cells, cell lines, tumor cells, etc.), polypeptides of the present invention produced using genetic recombination techniques. Or a transformant in which a cell surface molecule is highly expressed on the cell surface, or Using the "polypeptide fragment" or "fusion polypeptide” of the present invention as an antigen, a natural antibody obtained by immunizing a mammal such as a mouse, a rat, a hamster, a guinea pig, or a heron, and a gene recombination technique. Also included are chimeric antibodies and humanized antibodies (CDR-grafted antibodies) that can be produced using such antibodies, and human antibodies that can be produced using transgenic animals that produce human antibodies.
- CDR-grafted antibodies chimeric antibodies and humanized antibodies
- a monoclonal antibody having any isotype such as IgG, IgM, IgAsIgD, or IgE is also included. Preferably, it is IgG or IgM.
- the polyclonal antibody (antiserum) or monoclonal antibody referred to in the present invention can be produced by an existing general production method. That is, for example, a mammal, preferably a mouse, a rat, a hamus, a guinea pig, a penguin, a cat, and the like, as described above, together with Freund's adjuvant if necessary. It immunizes dogs, bushes, goats, peas or peas, more preferably mice, rats, hamsters, guinea pigs or peas.
- the polyclonal antibody can be obtained from serum obtained from the immunized animal.
- monoclonal antibodies are prepared by preparing hybridomas from the antibody-producing cells obtained from the immunized animal and myeloma cells (myeloma cells) having no autoantibody-producing ability, cloning the hybridomas, and immunizing mammals. It is produced by selecting a clone that produces a monoclonal antibody exhibiting a specific affinity for the antigen used in step (a).
- the monoclonal antibody can be specifically produced as follows. That is, the antigen as described above is used as an immunogen, and the immunogen is used together with Freund's adjuvant, if necessary, together with a non-human mammal, specifically, mouse, rat, or hams.
- a guinea pig or a heron, preferably a mouse, a rat, or a hams (a transgenic animal produced to produce an antibody derived from another animal such as a human antibody-producing transgenic mouse described below). Immunization by subcutaneous, intramuscular, intravenous, intravenous, footpad, or intraperitoneal injections by one or several injections or transplantation.
- immunization is performed 1 to 4 times about every 1 to 14 days after the first immunization, and antibody producing cells are obtained from the immunized mammal about 1 to 5 days after the final immunization.
- the number of immunizations and the time interval can be appropriately changed depending on the nature of the immunogen used.
- the preparation of a hybridoma secreting a monoclonal antibody was carried out according to the method of Keraichi and Mirsch Yuin et al. (Nature, Vol. 256, pp. 495-497, 1979). And a modification method equivalent thereto.
- antibody-producing cells preferably contained in spleen, lymph node, bone marrow, tonsil, etc., preferably spleen, obtained from a non-human mammal immunized as described above, and preferably mouse, rat, guinea pig, hamus It is prepared by cell fusion with a mammal such as a heron or a human, more preferably a mouse, a rat or a human, which has no ability to produce autoantibodies.
- a mammal such as a heron or a human, more preferably a mouse, a rat or a human, which has no ability to produce autoantibodies.
- myeloma cells used for cell fusion include mouse-derived myeloma cells P3 / X63-AG8.653 (653), P3 / NSI / l-Ag4-l (NS-1), P3 / X63-Ag8.Ul (P3U1), SP2 / 0-Agl4 (Sp2 / 0, Sp2), PAI, FO or BW5147, Rye-derived micelle 210RCY3-Ag.2.3 .
- Human-derived myeloma U-266AR1, GM1500-6TG-A2, UC729-6, CEM-AGR D1R11 or CEM-T15 can be used.
- hybridoma clones producing monoclonal antibodies was performed by culturing hybridomas, for example, in microplates, and immunizing the culture supernatants of the wells in which proliferation had been observed in the immunization described above.
- the reactivity with the antigen can be determined by, for example, measuring an enzyme immunoassay such as RIA or ELISA.
- the production of monoclonal antibodies from Hypri-doma is carried out in vitro, or in vivo, for example in mice, rats, guinea pigs, hamsters or egrets, preferably in mice or rats, more preferably in ascites of mice. It can be carried out by isolating from the obtained culture supernatant or ascites of a mammal.
- hybridomas When culturing in vitro, hybridomas are grown, maintained, and stored according to various conditions such as the characteristics of the cell type to be cultured, the purpose of the test and research, and the culture method, and the monoclonal antibody is produced in the culture supernatant. It can be carried out using any known nutrient medium or any nutrient medium derived and prepared from a known basal medium.
- Examples of the basic medium include a low calcium medium such as Ham, F12 medium, MCDB 153 medium or low calcium MEM medium and MCDB104 medium, MEM medium, D-MEM medium, RPMI 1640 medium, ASF104 medium.
- a medium or a high calcium medium such as an RD medium can be used.
- the basic medium can contain, for example, serum, hormones, site-in, and / or various inorganic or organic substances depending on the purpose.
- Monoclonal antibodies can be isolated and purified by purifying the culture supernatant or ascites described above with saturated ammonium sulfate, globulin precipitation, forceproic acid, forceprillic acid, ion exchange chromatography (DEAE or DE52). ) And affinity column chromatography such as an anti-immunoglobulin column or a protein A column.
- Preferred examples of the monoclonal antibody of the present invention include the following monoclonal antibodies.
- polypeptide having the amino acid sequence set forth in SEQ ID NO: 2 a polypeptide fragment derived from the polypeptide, or a monoclonal reactive with a human-derived cell surface molecule composed of the polypeptide antibody.
- the effect on mitogen-stimulated lymphoblast cells shows the effect of the monoclonal antibody produced by the hybridoma identified by International Deposit No. FERM BP-5708 on mitogen-stimulated rat lymphoblast cells.
- the monoclonal antibodies of the present invention also include monoclonal antibodies produced by hybridomas identified by International Accession Nos. FERM BP-5707 and FERM BP-5708, respectively.
- the “chimeric monoclonal antibody” of the present invention is a monoclonal antibody produced by genetic engineering, and specifically, the variable region thereof is a non-human mammal (mouse, rat, Hamus Yuichi, etc.). It means a chimeric monoclonal antibody such as a mouse / human chimeric monoclonal antibody, which is a variable region derived from munoglobulin and whose constant region is derived from human immunoglobulin.
- the constant region derived from human immunoglobulin, I g G (IgGl, IgG2 , IgG3 5 IgG4), I g M, I g A, has the amino acid sequence inherent in each isotype such as I g D and I g E,
- the constant region of the recombinant chimeric monoclonal antibody in the present invention may be a human immunoglobulin constant region belonging to any isotype. Preferably, it is a human IgG constant region.
- the chimeric monoclonal antibody in the present invention can be produced, for example, as follows. However, it is needless to say that the present invention is not limited to such a manufacturing method.
- a mouse / human chimeric monoclonal antibody can be prepared with reference to Experimental Medicine (Extra Issue), Vol. 1.6, No. 10, 1988, and Japanese Patent Publication No. 3-73280. That is, an active VH gene (rearranged VDJ gene encoding an H chain variable region) obtained from DNA encoding a mouse monoclonal antibody isolated from a hybridoma producing a mouse monoclonal antibody. Downstream, a CH gene (C gene encoding the H chain constant region) obtained from DNA encoding human immunoglobulin and an active gene obtained from DNA encoding a mouse monoclonal antibody isolated from the hybridoma were used.
- VL gene rearranged VDJ gene encoding an H chain variable region
- the CL gene (C gene encoding the L chain constant region) obtained from DNA encoding human immunoglobulin downstream of (the rearranged VJ gene encoding the L chain variable region) can be expressed respectively. And inserted into one or separate expression vectors, transforming host cells with the expression vectors, and culturing the transformed cells.
- DNA is extracted from a mouse monoclonal antibody-producing hybrid by a conventional method, and the DNA is digested with an appropriate restriction enzyme (eg, EcoRI, HindIII, etc.) and subjected to electrophoresis. (Eg using 0.7% agarose gel) and perform Southern blotting.
- the electrophoresed gel is stained with, for example, an ethidium die, and after taking a photograph, the marker is positioned and the gel is washed twice with water and immersed in a 0.25M HC1 solution for 15 minutes. Then immerse in 0.4N NaOH solution for 10 minutes while gently shaking. Transfer to Phil Yuichi by the usual method. After 4 hours, collect Phil Yuichi and wash twice with 2XSSC.
- an appropriate restriction enzyme eg, EcoRI, HindIII, etc.
- the fill After drying the fill, dry (75 ° C, 3 hours). After completion of the pacing, the fill is put in a 0.1 XS SC / 0.1% SDS solution and treated at 65 ° C for 30 minutes. Then soak in 3xS SC / 0.1% SDS solution. The obtained filter is put in a plastic bag together with the pre-hybridization solution and treated at 65 ° C for 3 to 4 hours.
- the probe DNA labeled with 32 P and the hybridization solution were added thereto. And react at 65 ° C for about 12 hours. After hybridization, wash the filter under appropriate salt concentration, reaction temperature and time (eg, 2 XSSC-0.1% SDS solution, room temperature, 10 minutes). Place the filter in a plastic bag, add a small amount of 2XSSC, seal, and perform autoradiography.
- appropriate salt concentration, reaction temperature and time eg, 2 XSSC-0.1% SDS solution, room temperature, 10 minutes.
- the rearranged VDJ gene and VJ gene encoding the H chain and L chain of the mouse monoclonal antibody, respectively, are identified by the Southern blot method described above.
- the region containing the identified DNA fragment is fractionated by sucrose density gradient centrifugation, incorporated into a phage vector (eg, Charon 4A, Charon 28, ⁇ L 3 human EMBL4, etc.), and E. coli (eg, , LE392, NM539, etc.) to create a genomic library.
- a phage vector eg, Charon 4A, Charon 28, ⁇ L 3 human EMBL4, etc.
- E. coli eg, , LE392, NM539, etc.
- the genomic library can be used, for example, by the Benton-Davis method (Science, Vol. 196, No. 180- (P.
- plaque hybridization is performed to obtain positive clones each containing the rearranged VDJ gene or VJ gene.
- a restriction enzyme map of the obtained clone is prepared, its nucleotide sequence is determined, and it is confirmed that the desired rearranged gene containing the VH (VDJ) gene or VL (VJ) gene has been obtained.
- the human CH gene and human CL gene used for chimerization are isolated separately.
- the C1 gene, which is a CH gene, and the C gene, which is a CL gene are isolated.
- These genes utilize the high homology of the nucleotide sequences of the mouse immunoglobulin gene and the human immunoglobulin gene to probe the mouse Ca1 gene and mouse C gene corresponding to the human ca1 gene and human CAT gene as probes. Can be obtained by isolation from a human genome library.
- human Ca1 gene is obtained, for example, by cutting human fetal hepatocyte DNA with Hindlll, fractionating by agarose gel electrophoresis, inserting a 5.9 kb band into 788, and using the probe described above. To isolate.
- a human CH gene is placed downstream of the mouse VH gene while taking into account the promoter region and enhancer region.
- the human CL gene is placed downstream of the mouse VL gene using an appropriate restriction enzyme and DNA ligase, for example, in an expression vector such as pSV2gpt or pSV2ne0 according to a conventional method. Incorporate.
- the chimeric gene of mouse VH gene / human CH gene and mouse VL gene / human CL gene may be simultaneously placed in one expression vector, or each may be placed in a separate expression vector. Can also.
- the chimeric gene insertion and expression vector prepared in this way can be used for protoplast fusion, DE AE-dextran method, and calcium phosphate in myeloma cells that do not produce antibodies themselves, such as P3X63'Ag8'653 cells or SP210 cells. It is introduced by the method or electroporation.
- the transformed cells are selected by culturing in a drug-containing medium corresponding to the drug resistance gene introduced into the expression vector to obtain the desired chimeric monoclonal antibody-producing cells.
- the desired chimeric monoclonal antibody is obtained from the culture supernatant of the antibody-producing cells thus selected.
- the “human monoclonal antibody (CDR-grafted antibody)” in the present invention is A monoclonal antibody produced by an elementary engineering method. Specifically, part or all of the complementarity-determining region of the hypervariable region is a non-human mammal (mouse, rat, Hamichi, etc.) Is the complementarity determining region of the hypervariable region derived from the monoclonal antibody described above, the framework region of the variable region is the framework region of the variable region derived from human immunoglobulin, and the constant region is the constant region derived from human immunoglobulin. Means a humanized monoclonal antibody.
- the complementarity-determining regions of the hypervariable region are three regions that are present in the hypervariable region in the variable region of the antibody and that directly bind to the antigen in a complementary manner (Complementarity-determining residue; CDRU CDR2, CDR 3), and the framework region of the variable region refers to four relatively conserved regions (Framework; FR1, FR2, FR3, FR4) intervening before and after the three complementarity determining regions. .
- it means a monoclonal antibody in which all but a part or all of the complementarity determining region of the hypervariable region of a monoclonal antibody derived from a non-human mammal has been replaced by the corresponding region of human immunoglobulin.
- the constant region derived from human immunoglobulin has a unique amino acid sequence depending on isotypes such as IgG (IgGl, IgG2, IgG3, IgG4), IgM, IgA, IgD and IgE.
- the constant region of the monoclonal antibody may be a human immunoglobulin constant region belonging to any isotype. Preferably, it is the constant region of human IgG.
- the framework region of the variable region derived from human immunoglobulin is not limited.
- the humanized monoclonal antibody in the present invention can be produced, for example, as follows. However, it is needless to say that the present invention is not limited to such a manufacturing method.
- a recombinant humanized monoclonal antibody derived from a mouse monoclonal antibody can be produced by genetic engineering with reference to Japanese Patent Application Laid-Open No. 4-506458 and Japanese Patent Application Laid-Open No. 62-296890. That is, mouse monoclonal Isolating at least one mouse H chain CDR gene and at least one mouse L chain CDR gene corresponding to the mouse H chain CDR gene from the hybridoma producing the body; A human H chain gene encoding the entire region other than the corresponding human H chain CDR and a human L chain gene encoding the entire region other than the human L chain CDR corresponding to the pre-mouse L chain CDR are isolated.
- the isolated mouse H chain CDR gene and human H chain gene are introduced into an appropriate expression vector so that they can be expressed, and the mouse L chain CDR gene and the human L chain gene can be expressed similarly.
- the mouse H chain CDR gene / human H chain gene and the mouse L chain CDR gene / human L chain gene can be introduced into the same expression vector so that they can be expressed.
- human monoclonal antibody in the present invention means that all regions including the variable region of the H chain and the constant region of the H chain, and the variable region of the L chain and the constant region of the L chain that constitute immunoglobulin are human immunoglobulins. Is an immunoglobulin derived from the gene encoding
- Human antibodies can be obtained by immunizing a transgenic animal produced by integrating at least a human immunoglobulin gene into a locus of a non-human mammal such as a mouse with an antigen according to a conventional method. It can be produced in the same manner as in the method for producing a polyclonal antibody or a monoclonal antibody described above.
- transgenic mice that produce human antibodies are described in Nature Genetics, Vol. 7, p. 13-21, 1994; Nature Genetics, Vol. 15, p. 146-156, 1997; Gazette; JP-T-Hei 7-509137 Gazette; Nikkei Science, June, No. 40-No. 50, 1990, International Application Publication WO94 / 25585, Nature, Vol. 368, p. 856-859, 1994; and Tokuhyo 6-50023 It can be produced according to the method described in Japanese Patent Publication No. 3 (JP-A) No. 3 and the like.
- part of an antibody in the present invention means a region corresponding to a part of the monoclonal antibody as described above, and specifically, F (ab,) 2 , Fab ′, Fab, Fv (variable fragmentant). of antibody), sFv, dsFv (disulphide stabilised Fv) or dAb (single domain antibody) etc.
- F (ab,) 2 Fab ′, Fab, Fv (variable fragmentant). of antibody
- sFv, dsFv disulphide stabilised Fv
- dAb single domain antibody
- F (ab ′) 2 ” and “Fab,” are produced by treating an immunoglobulin (monoclonal antibody) with pepsin or papain, which is a protease, in the hinge region.
- pepsin or papain which is a protease
- IgG is treated with papain, it is cleaved upstream of the disulfide bond existing between the two heavy chains in the hinge region and consists of VL (light chain variable region) and CL (light chain constant region).
- composition refers to the “polypeptide i, “Homodimer molecule”, “polypeptide fragment” or “fusion polypeptide” composed of the polypeptide, “homodimer molecule”, “antibody” or “part of antibody” composed of the fusion polypeptide And a pharmaceutically acceptable carrier.
- “pharmaceutically acceptable carrier” refers to excipients, diluents, extenders, disintegrants, stabilizers, preservatives, buffers, emulsifiers, fragrances, coloring agents, sweeteners, thickeners. And flavoring agents, solubilizing agents or other additives.
- tablets, pills, powders, granules, injections, liquids, capsules, troches, elixirs, suspensions, emulsions or syrups can be used.
- a composition can be prepared.
- These pharmaceutical compositions can be administered orally or parenterally.
- Other forms for parenteral administration include topical solutions containing one or more active substances, formulated in a conventional manner, suppositories and bessaries for enteral administration.
- the dosage varies depending on the age, sex, weight and condition of the patient, therapeutic effect, administration method, treatment time, or the type of active ingredient (such as the polypeptide or antibody) contained in the pharmaceutical composition.
- the dose can range from 10 g to 100 mg (or 10 g to 500 mg) per dose per adult. However, since the dose varies depending on various conditions, a dose smaller than the above dose may be sufficient, or a dose exceeding the above range may be necessary.
- 0.1 ⁇ antibody / 111 1 carrier to 1 O mg antibody / ml carrier in a non-toxic pharmaceutically acceptable carrier such as physiological saline or commercially available distilled water for injection. It can be produced by dissolving or suspending to a concentration of 2.
- the injections thus produced can be administered to human patients in need of treatment at a rate of 1 g to 100 mg / kg body weight per dose, preferably 50 mg / kg. It can be administered once to several times a day at a rate of 55 O mg.
- the form of administration may be intravenous injection, subcutaneous injection, intradermal injection, intramuscular injection or Can be exemplified by medically appropriate administration forms such as intraperitoneal injection. Preferably, it is an intravenous injection.
- Injectables may also be prepared as non-aqueous diluents (eg, propylene glycol, polyethylene glycol, vegetable oils such as olive oil, alcohols such as ethanol, etc.), suspensions and emulsions. Can also.
- non-aqueous diluents eg, propylene glycol, polyethylene glycol, vegetable oils such as olive oil, alcohols such as ethanol, etc.
- injections can be sterilized by sterile filtration through a bacterial retention filter, blended with a bactericide, or irradiated.
- Injectables can be manufactured in the form of ready-to-use preparations. That is, it can be used as a sterile solid composition by freeze-drying or the like, dissolved in sterile distilled water for injection or another solvent before use.
- the pharmaceutical composition of the present invention is applicable to the treatment and prevention of various autoimmune diseases, allergic diseases or inflammatory diseases caused by activation of lymphocytes such as T cells and abnormal control of activated lymphocyte functions. Is possible.
- the diseases include rheumatoid arthritis, multiple sclerosis, autoimmune thyroiditis, allergic contact dermatitis, lichen planus, a chronic inflammatory skin disease, systemic lupus erythematosus, insulin-dependent diabetes mellitus and psoriasis And the like.
- the therapeutic effect of the pharmaceutical composition of the present invention for various disease symptoms can be tested and examined by administering to a known disease model animal according to a conventional method.
- a model of human systemic lupus erythematosus (SLE) (NZB / NZW) F1 mouse (Science, Vol. 125, p. 1225-1227, 1994)
- MS multiple sclerosis
- EAE allergic encephalomyelitis
- 3 NOD non-o bese
- IDM insulin-dependent diabetes mellitus
- FIG. 1 is a micrograph showing the state of cell aggregation of FTL435 cells induced by “JTT.l antibody” and the state of inhibition of the cell aggregation by “JTT.2 antibody”.
- the diagram (a) shows the state of cells without adding any hybridoma supernatant
- the diagram (b) shows the state of cell aggregation by the “JTT-1 antibody”
- the diagram (c) shows The figure shows the state of cell aggregation when “anti-ICAM-1 antibody” was added together with “JTT-1 antibody”.
- the figure (d) shows the results when “JTT-2 antibody” was added together with “JTT-1 antibody”. The state of cell aggregation is shown.
- FIG. 2 is a micrograph showing the state of cell aggregation of FTL435 cells and rat activated lymphoblasts induced by “JTT.l antibody” and the state of inhibition of the cell aggregation by “JTT.2 antibody”. .
- (A) shows the state of the FTL435 cells without any antibody
- (b) shows the state of the FTL435 cells with PMA
- (c) shows the state of the cells.
- the state of FTL435 cells when "JTT-1 antibody” was added is shown.
- the diagram (d) shows the state of FTL435 cells when "anti-LFA-1 antibody” was added together with "JTT-1 antibody”.
- (E) shows the state of FTL435 cells when the anti-CD18 antibody was added together with the “JTT-1 antibody”
- (f) shows the anti-ICAM-1 antibody together with the “JTT-1 antibody”.
- the FTL435 cells show the condition of the cells when the antibody was added.
- the fraction (g) shows the condition of the activated lymphoblasts without any antibody, and the fraction (h) shows the PMA.
- the cell status of activated lymphoblasts when added is shown.
- Separate figure (i) shows the cell status of activated lymphoblasts when JTT-1 antibody was added.
- (J) shows the state of activated lymphoblasts when the anti-LFA-1 antibody was added together with the "JTT-1 antibody”, and (k) shows the state with the "JTT-1 antibody”.
- the cell status of activated lymphoblasts when anti-CD18 antibody was added is shown.
- the diagram (1) shows activated lymphoblasts when anti-ICAM-1 antibody was added together with "JTT-1 antibody”.
- 3 shows the state of the cells.
- FIG. 3 is a diagram showing the state of expression of “JTT.l antigen” and “JTT.2 antigen” in various cells measured using a flow cytometer.
- FIG. 4 is a view showing the state of expression of “JTT.l antigen” in various lymphoid cells measured using a flow cytometer.
- FIG. 5 is a photograph showing an electrophoretic image of “JTT.l antigen” analyzed by electrophoresis on SDS-PAGE.
- Fig. 6 shows the state of adhesion of rat thymocytes to the microplate coated with purified "JTT.l antigen” induced in the presence of "JTT.l antibody”, and the cell adhesion by "JTT.2 antibody”.
- 4 is a photomicrograph showing the state of inhibition of the present invention.
- Diagram (a) shows the state of cell adhesion to a plate not coated with "JTT-1 antigen", and diagram (b) shows "JTT-1 antigen” without any antibody added.
- the state of adhesion of cells to the plate coated with “JTT-1 antigen” is shown in Fig. 3 (c) when the Fab fragment of “JTT-1 antibody” was added.
- the cell adhesion state is shown, and the diagram (d) shows the plate on which the “JTT-1 antigen” was added when the “JTT-2 antibody” was added together with the “JTT-1 antibody” Fab fragment.
- 3 shows the state of cell adhesion.
- FIG. 7 is a diagram showing relative cell numbers based on the fluorescence intensity of thymocytes adhered to a plate coated with purified “JTT.l antigen”.
- a (-) indicates the relative cell count on a plate not coated with “JTT-1 antigen”
- Ag (+) + JTT.l Fab indicates the JTT-1 antigen when Fab fragment of JTT-1 antibody was added.
- the relative cell counts on the plate are shown, and “Ag (+) + JTT.l Fab + JTT.2” indicates the case where “JTT-2 antibody” was added together with the “JTT-1 antibody” Fab fragment.
- the relative cell number in the plate coated with “JTT-1 antigen” is shown.
- FIG. 8 shows the code for “rat JTT-1 antigen” measured using flow cytometry.
- FIG. 2 is a view showing the expression states of “rat JTT-1 antigen” and “rat JTT-2 antigen” in COS cells transformed with the cDNA to be transformed.
- FIG. 9 is a diagram showing the structural characteristics of the amino acid sequence of “JTT.l antigen” as determined by hydropathic blot analysis.
- FIG. 10 is a diagram showing the homology of the amino acid sequences of human, rat, and mouse “JTT.l antigen” and “rat JTT-1 antigen” mutants.
- FIG. 11 is a diagram showing the amino acid sequence homology in the amino acid sequences of “human JTT-1 antigen”, “human CD28 molecule” and “human CTLA-4 molecule” and the conservation of motifs.
- FIG. 12 is a diagram schematically showing the protein secondary structures of “human JTT-1 antigen”, “human CD28 molecule” and “human CTLA-4 molecule” and their similarities.
- FIG. 13 is a diagram schematically showing the structure of genomic DNA encoding “mouse JTT-1 antigen”.
- FIG. 14 is a diagram showing the differences in the amino acid sequences of “rat JTT-1 antigen” and its all-naturally-splicing variants.
- FIG. 15 is a graph showing the degree of proliferation of human peripheral blood lymphocytes induced by a monoclonal antibody against “human JTT-1 antigen” measured by a [ 3 H] thymidine incorporation test.
- the vertical axis indicates the incorporation amount (dpm) of [ 3 H] thymidine into cells.
- FIG. 16 shows the therapeutic effect of experimental allergic encephalomyelitis (EAE) in a disease model rat using a monoclonal antibody against “JTT-1 antigen”.
- the vertical axis shows the degree of scoring disease symptoms, and the horizontal axis shows the number of days elapsed after immunization immunization for EAE induction.
- FIG. 17 is a view showing the therapeutic effect of a monoclonal antibody against “JTT-1 antigen” on glomerulonephritis in a disease model rat.
- the vertical axis shows urinary protein excretion, and the horizontal axis shows the value after immunization for inducing glomerulonephritis. Indicates the elapsed time (week) of.
- FIG. 18 is a diagram showing a column histogram in the purification of a fusion polypeptide (rJTT-; 1-IgFc) between the extracellular region of “Rat JTT-1 antigen” and human IgFc using a protein A sepharose column. .
- FIG. 19 is a photograph showing an electrophoresis image of rJTT-1-IgFc analyzed by electrophoresis by SDS-PAGE.
- FIG. 20 is a diagram showing a column histogram in the purification of a fusion polypeptide of the extracellular region of “human JTT-1 antigen” and human IgFc (hJTT-1-IgFc) using a protein A sepharose column.
- FIG. 21 is a photograph showing an electrophoretic image of hJTT-1-IgFc analyzed by electrophoresis by SDS-PAGE.
- FIG. 22 is a diagram schematically showing the structure of a gene transfer vector for producing a transgenic mouse into which cDNA encoding “rat JTT-1 antigen” has been introduced.
- the antibody-producing hybridomas described below were prepared with reference to the method of Kohler et al. (Bloods Vol. 81, pp. 101-111, 1993, Omori et al.). The method was carried out with reference to the method of Kanagi et al. (Handbook of Experimental I cafe unology, Vol. 4, 117.2, p. 117.21, 1986).
- rat thymoma cell line FTL435 cells were used as an immunizing antigen, and the antigen was administered to BALB / c mice at intervals of 0 days (10 7 cells / animal), 7 days, 14 days and 28 days. A photo pad was administered. Only the first immunization was performed by mixing the antigen with Freund's complete adjuvant. Two days after the last immunization, the lymph nodes of the mouse were collected, By fusion with mouse myeoma cell line PAI (JCR NO.B0113; Res. Disclosure, Vol. 217, p. 155, 1982, Stocker, JW et al.) By conventional methods, a large number of monoclonal antibody-producing hybridomas were obtained. Was.
- PAI mouse myeoma cell line PAI
- Hybridomas were screened by analyzing the effect of the monoclonal antibodies produced in the culture supernatants of the various hybridomas and hybridomas prepared in Example 1 on FTL435 cells, which are immunogens.
- FTL435 cells which are immunogens.
- (A 5 x l0 6 cell / ml 0. 1ml) 96 -well microtiter FT L435 cells per Ueru the evening first plate seeded with the culture supernatant of each High Priestess dormer the (their respective 10 ⁇ G / ml)
- the cells were cultured at 37 ° C for 1 hour.
- Figures 1 and 2 show the results for the hybridoma "JTT-1" and the clone "JTT-2".
- the monoclonal antibody (JTT-1 antibody j) produced by the hybridoma clone "JTT-1" was confirmed to have the effect of strongly aggregating FTL435 cells (Fig. L (b) and Fig. 2 (c On the other hand, it was confirmed that the addition of "JTT-2 antibody” together with "JTT-1 antibody” strongly suppressed aggregation of FTL435 cells induced by "JTT.1 antibody” stimulation (Fig. 1 (d )). In addition, a system to which neither hybridoma supernatant was added was used as a control (FIGS. 1 (a) and 2 (a)).
- ICAM-1 Intercellular adhesion molecule-1
- LFA-1 Lymphocyte function-associated antigen-1
- activated lymphoblasts Similar to the effect on FTL435 cells, aggregation of activated lymphoblast cells was induced by stimulation with "JTT-1 antibody" (FIG. 2 (i)). However, for activated lymphoblast cells, most of the cell aggregation induced by “JTT-1 antibody” was stimulated by anti-LFA-1 antibody (Fig. 2 (j)) and anti-ICAM-1 antibody (Fig. 2 (1 )) (However, partial aggregation remained). As can be seen from the control system without any antibody (Fig. 2 (g)), activated lymphocytes such as activated lymphoblasts activate PMA (Phorbol myri state acetate: LFA-1). No aggregation by cell adhesion occurs unless it is stimulated by (Fig.
- JTT-1 and JTT-2 are international depositary organizations that have been accredited under the Budapest Treaty on October 11, 1996. No. 3 was deposited internationally at the Institute of Biotechnology and Industrial Technology of the Ministry of International Trade and Industry of Japan ([JTT-1]: International Deposit Number FERM BP-5707, [JTT-2]: International Deposit Number FERM BP-5708 ) o
- JTT-1 antibody and JTT-2 antibody are both determined to be IgGl.
- mice Five to ten week old wisdom rats (150 to 250 g) were anesthetized and killed with a jetilether. The abdomen was opened by a surgical operation, and the thymus and spleen were excised from the chest and abdomen, respectively, and ground to prepare a cell suspension. Furthermore, activated lymphoblasts were prepared by culturing the spleen cells in RPMI 1640 medium containing concanapalin A (2 zg / ml) and 10% FCS at 37 ° C for 3 days.
- FTL435 cells thymocytes, spleen cells and activated lymphoblasts ( 5 ⁇ 10 5 cells each) were reacted with “JT T.1 antibody” or “JTT.2 antibody”, followed by FITC-labeled anti-mouse IgG (Cappe 1). After the reaction, the fluorescence intensity of the stained cells was measured using an EPICS-Elite flow cytometer.
- JTT-1 antigen recognized by “JTT.l antibody” in various lymphoid cells
- the lymphocytes of two types of rats were analyzed.
- the reactivity of the “JTT-1 antibody” to the nodal, spleen-derived T lymphoblasts, and spleen-derived B lymphoblasts was analyzed.
- Wistar rats and F344 rats (150 to 250 g) at the age of 5 to 10 weeks were killed by anesthesia with Jetil ether.
- Each rat was surgically laparotomized to remove lymph nodes and spleen, and ground to prepare a cell suspension.
- the spleen cell preparation was incubated at 37 ° C in RPMI1640 medium containing Concanapalin A (ConA; 2 zg / ml) and 10% FCS. Cultured for days.
- activated T lymphoblasts and activated B lymphoblasts were obtained after culturing for 1 day and after culturing for 3 days.
- spleen-derived T lymphoblasts and B lymphoblasts obtained before adding lymph node cells and ConA (day 0) were used.
- each cell (5 ⁇ 10 5 cells) with a biotin-labeled anti-rat T cell antibody or a biotin-labeled anti-rat B cell antibody (10 ig / ml, manufactured by Seikagaku Corporation), Reacted with labeled streptavidin. Then, the cells were reacted with FITC-labeled “JTT-1 antibody” (10 ⁇ g / ml), and the fluorescence intensity of the stained cells was measured using an EPICS-Elite flow cytometer.
- Fig. 4 shows the results.
- strong expression of “JTT.l antigen” was observed in activated T lymphoblasts and activated B lymphoblasts from day 1 of activation due to ConA ⁇ intense.
- the expression pattern of “JTT.l antigen” in each cell type was almost the same.
- the cells After washing the FTL435 cells with PBS, the cells are suspended in 0.1 M glucose-containing saline (PH8.0) containing 100 ⁇ g / ml NHS-Piotin to a concentration of lx10 7 cells / ml, and incubated at room temperature. The reaction was performed for 40 minutes. After washing the cells three times with PBS, add a solubilization buffer (l% NP-40, lOmMTris-HCl (pH 7.4), 0.15 M NaCl) to a concentration of 5 x 10 7 cells / ml. C, reacted for 30 minutes to lyse the cells. The obtained cell lysate was centrifuged, and the centrifuged supernatant containing the biotinylated soluble cell surface molecule was stored at -80 ° C.
- PH8.0 glucose-containing saline
- solubilization buffer l% NP-40, lOmMTris-HCl (pH 7.4)
- the purified sample of the purified “JTT.l antibody” was mixed with protein G-Sepharose beads at 2 mg / ml and reacted at 4 ° C for 1 hour to bind the antibody to the beads.
- the beads were washed, 500 1 of biotinylated FTL435 cell lysate was added to 10 1 of the beads, and the mixture was reacted at 4 ° C for 2 hours.
- the beads are washed three times with the solubilization buffer, and 50 ⁇ 1 of a glycanase buffer (a sodium phosphate buffer containing 0.15% SDS (pH 7.0)) is added and the mixture is boiled.
- a glycanase buffer a sodium phosphate buffer containing 0.15% SDS (pH 7.0)
- SDS-polyacrylamide gel electrophoresis SDS-PAGE sample buffer (Enprotech)
- Enprotech SDS-polyacrylamide gel electrophoresis
- eluted sample 51 in the presence or absence of 2-mercaptoethanol and boil.
- PVDF membrane After blocking the transfer membrane with 3% BSA-PBS, and then reacting with peroxidase-labeled streptavidin, use E (System (Amersham)) as described in the instruction manual.
- FIG. 5 shows the results.
- the molecule (“JTT-1 antigen”) on FTL435 cells recognized by “JTT.l antibody” has a molecular weight of approximately 47 kD under non-reducing conditions (indicated by “(-)” in Fig. 5). It had a molecular weight of about 24 kD and about 28 kD under reduction (indicated by “” ”in FIG. 5).
- N-type sugar chains indicated by “+ N-gly” in FIG. 5
- JTT.l antigen converged to a single band of about 36 kD under non-reducing and about 20 kD under reducing. From the above results, it was presumed that “JTT.l antigen” has a different sugar chain modification and a core protein forms a dimer consisting of the same molecule. In addition, in the test performed in the same manner as described above using the “JTT.2 antibody”, exactly the same results were obtained. Considering this result and the results of Example 3 and Example 7 described later, “JTT.l antigen” (a molecule recognized by “JTT-1 antibody”) and “JTT.2 antigen” (“JTT-2 Molecules recognized by the “antibody” were considered to be identical molecules.
- JTT.l antibody (“JTT-1 antigen”) has a function as an adhesion molecule.
- N-terminal amino acid analysis was performed by TT.
- FTL435 cells were cultured using RPMI1640 medium containing 10 FCS. The cells were collected by centrifugation, and the pellet was washed three times with PBS. Solubilization buffer-(l% NP-40, 10 mM Tris-HCl (pH 7.4), 0.15 M NaCl) is added to the washed pellet at 5 x 10 7 cells / ml, and the mixture is added at 4 ° C for 30 minutes. The reaction was performed to lyse the cells. The obtained cell lysate was centrifuged, and the centrifuged supernatant containing soluble cell surface molecules was stored at -80 ° C.
- the purified "JTT.l antigen" obtained in (2) was coated on a 96-well ELISA plate at 10 / l / well by 1 ⁇ . After washing the plate with PBS, 200 ⁇ l / well of PBS containing 3% BSA was added and blocking was performed for 2 hours. After playing Bok washing with PBS, each Ueru to 1 fluorescent-labeled thymocytes alone (2 x l0 7 cells / ml with O.
- the fluorescence intensity at a wavelength of 538 nm was measured using a Fluoroscan II microplate Fluorome—Evening (manufactured by Flow Laboratories) to determine the fluorescence-labeled thymocytes bound to each well. The relative cell number was counted. A system not coated with purified “JTT-1 antigen” was used as a control.
- Fig. 6 shows the results of optical microscope observation.
- Thymocytes significantly adhered to the purified "JTT.l antigen” only in the presence of the Fab fragment of "JTT.l antibody” (Fig. 6 (c)). The adhesion was significantly inhibited by the “JTT.2 antibody” (FIG. 6 (d)).
- FIG. 7 shows the result of measuring the relative cell number of thymocytes adhered to “JTT.l antigen” coated on each cell by fluorescence intensity. From the above results, it was confirmed that “JTT.l antigen” has a function as an adhesion molecule.
- Con A-stimulated rat spleen-derived lymphoblasts (Con A blast) (approximately 1 x 10 6 cells / m 1) were centrifuged at 4 ° C for 5 minutes (2,000 xg), and the precipitated cells were washed with IS0GEN (Nipoponji). The suspension was extracted with a black-mouthed form, and the supernatant was recovered. After isopropanol was added to the obtained supernatant and allowed to stand at room temperature for 10 minutes, the mixture was centrifuged at 4 ° C. for 10 minutes at 12,000 ⁇ g to precipitate MA. The precipitated RNA was washed with ethanol and then dissolved in TE buffer. From the obtained total RNA, poly (A) + RNA was purified using “mRNA Purification Kit” (Pharmacia).
- cDNA was synthesized using “Time Saver cDNA Synthesis Kitj (Pharmacia). To improve screening efficiency,“ oligo dT primer with Not I cleavage site ” (Pharmacia) was used. Next, EcoRI was added to the adapter and digested with Notl to obtain cDNA with unidirectionality. C The size was fractionated using a span column (Pharmacia).
- the obtained cDNA having EcoR I and Not I ends was ligated to EcoR I and Not I treated vector-PME18S (Hara, T. and Miyajima, A. EMBOJ., 11, 1875-1884, 1992).
- "DNA ligation Kitj manufactured by Takara Shuzo
- E. coli DH5 manufactured by Toyobo
- the OD value of the transformant 600 ⁇ m was used. After culturing until the value reached 0.6, plasmids were collected and the plasmid DNA containing the library 1 was recovered using a QUIAGEN-Tip (manufactured by QUIAGEN).
- the obtained library was transfected into C0S7 cells by the electroporation method (Potter, H. et al. Proc. Natl. Acad. Sci. USA, 85, 2288-2292).
- the cells were cultured for 60 hours after the introduction, the supernatant was removed, and the cells were washed three times with PBS. Next, the cells were treated with PBS (0.5 mM EDTA) (37C, 30 minutes), and then the cells were detached by pipetting. Further, only live cells were collected using "Lymphprep" (manufactured by NYC0MED).
- the obtained living cells were suspended in PBS (5% FCS, 0.5 mM EDTA).
- the cell suspension was transferred to a culture dish coated with “JTT.1 antibody” and allowed to act at room temperature for 3 hours. Remove unbound cells from the culture dish, wash the culture dish three times with PBS, and recover plasmid DNA from cells bound to the culture dish by the Hirt method (Hirt, BJMol. Biol., 26.365-369). did.
- E. coli DH10B (GIEBC0 BRL) was transformed using the obtained plasmid DNA. Plasmid DNA was amplified and purified using the transformant in the same manner as in the above (3). Using the obtained DNA, the operations described in (1) and (2) above were further repeated twice.
- the transformed E. coli DH10B was cultured overnight on an LB plate containing ampicillin to obtain colonies. Cultivate 20 drug-resistant colonies and collect and insert plasmid MA by alkaline miniprep method (Maniatis, T. et al. Molecular Cloning; A Larolatory Mnual, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York) The inserted DNA (insert DNA) was analyzed. As a result of agarose gel electrophoresis, it was revealed that clones having a cDNA of about 0.9 kb (hereinafter, this clone is referred to as “T132A7”) were enriched.
- T132A7 was once again transiently expressed in C0S7 cells.
- the cells transfected with “T132A7” are reacted with “JTT.l antibody” or “JTT.2 antibody”.
- JTT.l antibody or “JTT.2 antibody”.
- FITC-labeled anti-mouse IgG manufactured by Cappel
- the fluorescence intensity of the stained cells was measured using an EPICS-Elite flow cytometer (manufactured by Coulter).
- “JT T.1 antibody” and “JTT.2 antibody” strongly recognized the “T132A7” gene product.
- Figure 8 shows the results.
- the nucleotide sequence of clone "T132A7” was determined by the dideoxy method using "Auto Read Sequencing Kit” (Pharmacia) and "ALFDNA sequencer ⁇ (Pharmacia).
- the deduced amino acid sequence of “rat JTT.1 antigen” was analyzed using the gene analysis software “GENEWORKS” (manufactured by IntelliGenetics).
- the nucleotide sequence and deduced amino acid sequence are set forth in SEQ ID NO: 4.
- the amino acid sequence (consisting of 200 amino acid residues) deduced from the cloned gene contains the same amino acid sequence as the N-terminal amino acid sequence determined in Example 6- (3).
- the amino acid sequence (consisting of 200 amino acid residues) deduced from the cloned gene contains the same amino acid sequence as the N-terminal amino acid sequence determined in Example 6- (3).
- JTT.l antigen The primary structure of the deduced amino acid sequence of “JTT.l antigen” was analyzed by hydropathy 'broth according to the method of Kite and Doolittle (Kite, J. & Doolittle, RFJ Mol. Biol. 157, 105-132, 1982). (Fig. 9). As a result, it was revealed that “JTT.l antigen” is a cell transmembrane protein having a signal sequence at the N-terminus. As a result of motif analysis, the extracellular domain of “JTT.l antigen” has two asparagine-linked sugar chain binding sites in the extracellular domain, and the intracellular domain has two It was clarified that it had a protein kinase C phosphorylation site at the force site. In FIG.
- the clone "T132A7” obtained in Example 7 was digested with restriction enzymes EcoM and Notl, and about 0.9 kb of cDNA encoding "rat JTT.1 antigen” was cut out and separated by agarose gel electrophoresis.
- the separated DNA fragment was purified using the "QUIAEX gel extraction kit” (quia TEN KK), and the resulting DNA fragments using "Ready-To- Go DNA labelling ki t" (Pharmacia Co., Ltd.) 3 2 Labeled with P. This labeled DNA fragment was used as a probe for black hybridization.
- poly (A) + A was extracted from lymphocytes (ConA blast) derived from human peripheral blood stimulated with ConA.
- the obtained cDNA having an EcoRI end was ligated to a vector treated with EcoRI— “ZAPII” (manufactured by Stratagene).
- DNA ligation Kitj Teakara Shuzo
- GIGA PACKII GOLDj (Strategene) "
- E. coli XLlBlue MRF (Strategene) as a host, a cDNA library consisting of plaques containing recombinant phage was prepared.
- the base sequences of the seven clones were analyzed by the dideoxy method using “Auto Read Sequencing”.
- nucleotide sequence of the cDNA corresponding to the open reading frame (ORF) of “human JTT-1 antigen” is shown in SEQ ID NO: 1
- the predicted full-length amino acid sequence of “human JTT.1 antigen” is shown in SEQ ID NO: 2
- the nucleotide sequence containing the 5 'and 3' sequences is shown in SEQ ID NO: 3 (0RF is nucleotides 26 to 625).
- nucleotide sequence contained in the clone encodes the full length of "human JTT-1 antigen” means that the amino acid sequence deduced from the nucleotide sequence (consisting of 199 amino acid residues) This is evident from the fact that it shows significant homology with the amino acid sequence of rat JTT.1 antigen j (Fig. 10). As shown in Fig. 10, The amino acid sequence homology of “JTT.l antigen” is S 0% or more.
- E.coU.DHlOB (GIBCO BRL) transformed with the clone “pBSh41” was transferred to Tsukuba, Japan, an international depositary institution accredited under the Budapest Treaty on October 25, 1996. ⁇ East 1-3-1, No. 3 Deposited at the surgical institute (Deposit No .: FEM BP-5725).
- the “JTT-1 antigen” of the present invention has the same structure as that of “CD28” and “CTLA-4”, which play an important role in controlling the activation of T cells, which is the main role of such an immune response. Because of its structure, the "JTT-1 antigen” of the present invention plays an important role in controlling the activation of lymphocytes such as T cells, which are the main components of the immune reaction, as well as those molecules. Presumed to be a molecule
- the clone "T132A7” obtained in Example 7 was digested with restriction enzymes EcoRI and Notl, and about 0.9 kb of cDNA encoding "rat JTT.1 antigen” was cut out and separated by agarose gel electrophoresis.
- the separated DNA fragment was purified using the "QUIAEX gel extraction kit” (quia TEN KK), and the resulting DM fragments using "Ready- To-Go DNA labelling ki tj (Pharmacia Co.) 3 2 P The labeled DNA fragment was used as a probe for plaque hybridization. 2.
- cDNA was synthesized using oligo dT primer (Pharmacia) and "Time Saver cDNA Synthesis Kitj (Pharmacia)". After adding an EcoRI adapter, size fractionation was performed using a span column (Pharmacia).
- the cDNA having the EcoRI end obtained as described above was ligated to EcoRI-treated vector 1ZAPI I (Stratagene).
- the "DNA ligation Kit” (Takara Shuzo) was used for the ligation reaction.
- the obtained phage particles are used to contain a recombinant phage using E coli XLlBlue MRF '(manufactured by Stra tagene) as a host.
- a cDNA library consisting of plaques was prepared.
- the screening was carried out according to the plastic hybridization method (Maniatis, T. et al. Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York) using Rapid hybridization buffer (manufactured by Amersham).
- cDNA libraries (1 ⁇ 10 4 ) was seeded on an agar plate, and a replica was prepared using Hybnd-N nylon menbrane (Amersham). Using 3 2 P-labeled probe prepared by replica ⁇ beauty the 9-1 were plaque hybrida I Ze one Chillon in Rapid hybridization buffer (A mersham Co.). Primary screening and secondary screening were performed to obtain 5 positive clones. Each black After isolation of the clone with a single plaque, the clone was subjected to in vivo excision according to the Stratagene Instruction Manual, and 5 clones were recovered as plasmid DNA.
- the nucleotide sequence of each of the five clones was determined by the dideoxy method using the "Auto II ead Sequencing Kit” (Pharmacia) and the Factory A.L.F. thigh sequencerj (Pharmacia). Four of the five clones contained the same nucleotide sequence.
- the nucleotide sequence and deduced amino acid sequence of cDNA encoding the full length of “mouse JTT-1 antigen” are shown in SEQ ID NO: 5.
- mouse JTT-1 antigen is composed of 200 amino acid residues in the same manner as “rat JTT-1 antigen”. "-1 antigen” had significant amino acid sequence homology (over 60%) between each. 5. Analysis of chromosomal location of mouse JTT-1 antigen gene
- the location of the gene encoding “mouse JTT-1 antigen” on the chromosome was analyzed by a fluorescence in situ hybridization method.
- FIG. 13 schematically shows the structure of the genomic DNA.
- the genomic DNA clone obtained above was labeled with digoxigenin dUTP by nick translation to obtain a probe. After the labeled probe was ligated with the fragmented mouse DNA, it was hybridized to a normal metaphase chromosome derived from mouse embryonic fibroblasts in a solution containing 50% formaldehyde, dextran sulfate 10 and 2 ⁇ SSC. I let it. The specific hybridization signal was detected by incubating the hybridization slide in a fluorescently labeled anti-digoxigenin antibody and then staining with DAPI. First trial In the experiment, specific labeling was performed in the vicinity of the largest chromosome, probably chromosome 1, based on the size of the DNA and the appearance of the band.
- the genomic MA clone was co-hybridized with a probe specific to the centromere region of chromosome 1.
- the centromere region of chromosome 1 and its neighboring regions were specifically labeled.
- the genomic DNA clone was found to be 3 distances from the boundary between heterochromatin and euchromatin to the telomere of chromosome 1. It was revealed that the gene was located in the same band "1C3" as the 3% position, that is, the position on the chromosome of the mouse "CD28" and "CTLA-4" genes.
- specific labeling was confirmed at this position in 79 cells.
- the clone “T132A7” obtained in Example 7 was digested with restriction enzymes EcoM and Notl, and about 0.9 kb of cDNA encoding “rat JTT.1 antigen” was cut out and separated by agarose gel electrophoresis.
- the separated DM fragment was purified using the "QUIAEX gel extraction kit” (quia TEN KK), and the resulting DNA fragments using "Ready-To-Go DNA labelling ki t " (Pharmacia Co., Ltd.) 3 2 Labeled with P. Plaque this labeled DNA fragment It was used as a probe for pre-digestion.
- poly (A) + RM was extracted from a rat thymoma cell line FTL435 (about 1 ⁇ 10 6 cells / ml).
- cDNA was synthesized using oligo dT primer (Pharmacia) and "Time Saver cDNA Synthesis Kitj (Pharmacia). After adding an EcoRI adapter to the sample, size fractionation was performed using a span column (Pharmacia).
- the cDNA having the EcoRI end obtained as described above was ligated to EcoRI-treated vector -IZAPI I (Stratagene).
- EcoRI-treated vector -IZAPI I (Stratagene).
- a DM Ligation Kitj (Takara Shuzo) was used.
- the obtained phage particles are used to construct a plaque containing recombinant phage using E coli XLlBlue MRF '(manufactured by Stratagene) as a host.
- the cDNA library ( 4 lx lO) prepared as described above was spread on an agar plate, and a replica was prepared using Hybnd-N nylon menbrane (Amersham). Using 3 2 P-labeled probe prepared by the replica and the 10-1 were plaque hybrida I Ze one Chillon in Rapid hybridization buffer (Amersham Co.). Primary screen And positive screening were performed to obtain two positive clones. After each clone was isolated with a single plaque, it was subjected to in vivo excision according to the Stratagene Instruction Manual, and two clones were recovered as plasmid DNA.
- the nucleotide sequence of each of the two clones was determined by the dideoxy method using the “Auto Read Sequencing Kitj (Pharmacia) 3 ⁇ 4t ALFDNA sequencer (Pharmacia). All the two clones had the same base.
- the nucleotide sequence and deduced amino acid sequence of the cDNA encoding the full length of the obtained “Latt JTT-1 antigen” are shown in SEQ ID NO: 6.
- the amino acid sequence (SEQ ID NO: 6) deduced from the obtained cDNA sequence was replaced with the amino acid sequence (SEQ ID NO: 4) deduced from the cDNA sequence encoding the “rat JTT-1 antigen” cloned in Example 7. (Fig. 14).
- the amino acid sequence encoded by the cDNA cloned in this test encodes the "lat JTT.1 antigen" obtained in Example 7.
- the amino acid sequence encoded by the cDNA (1) the three consecutive amino acid sequences at the C-terminus (Met-Thr-Ser) are changed to Thr-Ala-Pro, and (2) the Thr-Ala-Pro Pro is followed by an additional 16 consecutive amino acid residues (Leu-Arg-Ala-Leu-Gly-Arg-Gly-Glu-His-Ser-Ser-Cys-Gln-Asp-Arg-Asn)
- the amino acid sequences were identical except for the two differences. Therefore, it is considered that the cDNA cloned in the present test encodes an 'alternative splicing valiant' of 'rat JTT.1 antigen' obtained in Example 7. .
- the plasmid clone pBSh41 obtained in Example 8 was digested with a restriction enzyme EcoRI to cut out a DNA fragment containing cDNA encoding the full length of “human JTT-1 antigen”.
- Plasmid KpEFneo Proc. Natl. Acad. Sci. USA, 91, 158-162, 199 treated with the DNA fragment was also treated with the restriction enzyme EcoRI using a DNA ligase kit (Takara Shuzo).
- the expression vector was prepared by inserting it into 4). The vector was used to transform CH0-K1 cells (ATCC: CCL-61) by electroporation.
- Geneticin-resistant transformed cells were selected by culturing the cells for about 2 weeks in HPMI1640 medium containing Geneticin (0.8 mg / ml; manufactured by GIBCO BRL) and 10% fetal calf serum. c Expression of the recombinant "human JTT-1 Fanbara" was confirmed by Northern blotting using a conventional method.
- Example 12 Preparation of monoclonal antibody against "human JTT.1 antigen"
- the transformed cells expressing the recombinant "human JTT-1 antigen” prepared in Example 11 were homogenized and ultracentrifuged. (100,000 xg), and the centrifugation residue containing the cell membrane fraction was collected and suspended in PBS.
- the obtained cell membrane fraction was initially immunized (day 0) by injecting it into the footpad of a BALB / c mouse together with complete Freund's adjuvant. Further, the cell membrane fraction antigen was administered into the footpad at intervals of 7 days, 14 days and 28 days. Two days after the last immunization, lymph node cells were collected.
- lymph node cells and mouse myeloma cells PAI JCR NO. B0113; Res. Disclosure, Vol. 217, P. 155, 1982
- polyethylene glycol 4000 manufactured by GIBC0
- a monoclonal antibody-producing hybridoma was prepared by cell fusion.
- Hybridomas were selected by culturing in ASF104 medium (Ajinomoto) containing HAT containing 10% fetal bovine serum and aminopterin.
- the reactivity of the monoclonal antibody produced in the culture supernatant of each hybridoma against "human JTT-1 antigen” was determined by using the recombinant "human JTT-1 antigen" prepared in Example 11 for each culture supernatant. After the reaction with the transformed cells expressing the expression, the fluorescence intensity of the cells stained by reacting with FITC-labeled anti-mouse IgG (Cappel) was measured by EPICS-ELIT E Flow Satome overnight. did. As a result, it was confirmed that 10 or more types of hybridomas producing monoclonal antibodies reactive with “human JTT-1 antigen” were obtained.
- Each of two of these hybridomas (designated clones SA12 and SG430, respectively) S a (1 0 6 to 1 0 7 /0.5ml/ mice) were injected intraperitoneally into ICR nu / nu mice (female, 7 to 8 weeks of age). Ten to twenty days later, the mice were laparotomized under anesthesia, and large amounts of two types of monoclonal antibodies (SA12 and SG430) reactive with “human JTT-1 antigen” were prepared from ascites fluid collected in a conventional manner.
- JTT-1 antigen is considered to have a possibility of being involved in controlling the activation of lymphocyte cells in an immune reaction, like "CD28” and "CTLA-4".
- an immune reaction like "CD28” and "CTLA-4”.
- monoclonal antibodies against "human JTT-1 antigen” on human lymphocytes was analyzed using cell proliferation as an index.
- lymphocytes When treated with either monoclonal antibody SA12 or SG430 alone, lymphocytes grew approximately 10-fold with either antibody compared to controls. In addition, when used in combination with 0KT3, either monoclonal antibody SA12 or SG430 was used. In some cases, lymphocytes grew about 100-fold.
- JTT-1 antigen functions in controlling lymphocyte activation.
- the cell proliferation rate was amplified in combination with 0KT3, indicating that "JTT-1 antigen” is responsible for the same costimulatory signal transmission as “CD28” and "CTLA-4". It is.
- autoimmune diseases rheumatoid arthritis, multiple sclerosis, autoimmune thyroid, etc.
- signaling between CD28 / CTLA-4-CD80 / CD86.
- Many attempts have been made to treat inflammation, allergic contact dermatitis, chronic inflammatory skin diseases such as lichen planus, systemic lupus erythematosus, insulin-dependent diabetes mellitus and psoriasis.
- JTT-1 antigen of the present invention is a molecule involved in activating or suppressing lymphocytes such as “CD28” and “CTLA-4”, multiple sclerosis
- EAE allergic encephalomyelitis
- MS monoclonal antibody against “JTT-1 antigen” in the model was analyzed.
- Hartley guinea pig cerebral spinal cord homogenate (800 mg / ml saline) was mixed with an equal volume of complete complete adjuvant to prepare an emulsion as an immunizing antigen.
- the emulsion was immunized intradermally by injecting 0.25 ml each of the left and right toes of Lewis Rat (female, 6 weeks old, 15 animals). The administration was performed such that the dose of the homogenate was 200 mg per rat. This immunization can induce allergic encephalomyelitis (EAE).
- the immunized rats were divided into 3 groups of 5 rats, and for each group, one of the following (1) to (3) was determined immediately after immunization (day 0) and 3 times from the immunization. Administered intravenously on the 6th, 9th and 12th days.
- JTT-1 antigen is a molecule that functions in inducing immune responses including activation of lymphocytes induced by immunization with a foreign antigen.
- a glomerular basement membrane (GBM) nephritis model rat was prepared, and the effect of a monoclonal antibody against “JTT-1 antigen” in the model was analyzed.
- Immunized rats were divided into 8 groups of 6 rats, and for each group, one of the following (1) to (3) was used immediately after immunization (0) and then 3 times a week for 5 weeks It was administered over a period of time.
- JTT-2 antibody against “rat JTT-1 antigen” prepared in Example 2 (dose: 3 mg / kg (2 ml PBS / kg), intravenous administration);
- JTT-1 antigen is a molecule that functions in the induction of immune responses including activation of lymphocytes induced by immunization with a foreign antigen.
- Example 16 Preparation of fusion protein of "JTT-1 antigen” and Ig Fc As described in Examples 8, 13 to 15, the "JTT-1 antigen” of the present invention is a costimulatory cell involved in controlling the activation of lymphocytes such as "CD28" and "CTLA-4".
- a fusion protein consisting of the extracellular domain of “CTLA-4” and the Fc region of human immunoglobulin IgG1 (CTLA-4-IgFc) is useful for the treatment of various autoimmune diseases. It is reported to be effective.
- CTLA-4-IgFc human immunoglobulin IgG1
- the extracellular region of the ⁇ JTT-1 antigen '' was identified as human IgGFc to confirm the applicability of solubilized JTT-1 antigen similar to CTLA-4-IgFc to the treatment of various autoimmune diseases. was prepared as follows.
- a cDNA encoding the full length of "rat JTT-1 antigen” was cloned using the primer "T132A7” as a ⁇ type, and PCR was carried out using the primer, with both Xhol and BamHI cleavage sites at both ends.
- a cDNA containing a cDNA encoding the extracellular region of "rat JTT-1 antigen” was prepared.
- the obtained PCR product was digested with Xhol and BamHI, and subjected to agarose gel electrophoresis, to isolate a cDNA fragment encoding the extracellular region of interest and a band having a size of about 450 bp, which is expected.
- the isolated cDNA fragment was subcloned into a plasmid pBluescript I SK (+) (Stratagene) digested with Xhol and BamHI.
- the cDNA fragment contained a region encoding the region from amino acid numbers 1 to 141 of “Rat JTT-1 antigen” (SEQ ID NO: 4).
- DNA encoding Fc of human IgGl as a fusion partner is plasmid
- the plasmid was digested with Xhol and Xbal to cut out a DNA fragment of about 1.8 kb containing a fusion DNA consisting of the extracellular region of “Rat JTT-1 antigen” and human IgFc.
- T4 DNA ligase this fused DNA fragment was expressed in an expression vector pME18S (Medical Immunology, Vol. 20, No. l, p. 27-32, 1990, and Experimental Medicine (separate volume): Genetic Engineering Handbook ", Youtosha, p. 107, p. 107, 1992) inserted into the Xhol and Xbal sites, and the plasmid prJTT- ;! -IgFc was constructed.
- HEK293 cells (ATCC CRL1573) monolayer cultured in subconfluent in DMEM medium containing 10% fetal calf serum and ambicilin by the electroporation method were transformed with Brasmid prJTT-1-IgFc. Transformed cells were obtained.
- the transformed cells were cultured for 72 hours in serum-free ASF104 medium to express rJTT-1-IgFc.
- rJTT-1-IgFc was purified using a Protein G Sepharose affinity column (Pharmacia) as follows.
- the centrifuged supernatant obtained by centrifuging the culture supernatant was added to a Protein G Sepharose affinity column which had been equilibrated with a binding buffer in advance. Next, the column was washed with a binding buffer and then eluted with an elution buffer. The eluate was collected and dialyzed by exchanging the external solution with a phosphate buffer at least twice to obtain purified rJTT-1-IgFc.
- the cDNA encoding the full length of the “rat JTT-1 antigen” obtained in Example 7 was expressed in pCAGGS (Gene, Vol. 108, p. 193) containing the chicken / actin promoter. -200, 1991) using a DNA end blunting kit (Yukara Co., Ltd.) to obtain plasmid prJTT-1.
- prJTT-1 was treated with restriction enzymes to make it linear.
- a plug obtained by crossing a white ICR mouse (female, Nippon SLC) and a vaccinated white ICR mouse (male, Nippon SLC) was used.
- Female ICR mice were used.
- mice for egg collection to obtain fertilized eggs for introducing the “rat JTT-1 antigen” gene were PEAMEX (5 units, manufactured by Sankyo Zoiki) and Pregnyl (5 units, manufactured by Organon).
- BDF-1 mice female, manufactured by Nippon S.L.I.
- BDF-1 mice female, manufactured by Nippon S.L.I.
- BDF-1 mice male, manufactured by Nippon S.L.I.
- BDF-1 mice male, manufactured by Nippon S.L.I.
- the oviduct was excised from BDF-1 mouse (female), and only fertilized eggs were obtained by treatment with hyaluronidase and stored in the medium.
- the introduction of the “rat JTT-1 antigen” gene into fertilized eggs is performed using a manipulator under a microscope. Was performed according to a conventional method.
- the fertilized egg was fixed with a retaining needle, and a solution containing the linear gene encoding the ⁇ rat JTT-1 antigen '', diluted with Tris EDTA buffer at 37 ° C under a condition of 37 ° C, was injected using a DNA introduction needle.
- the fertilized eggs were injected (microinjection) into the male pronucleus.
- rat JTT-1 antigen The tail of a child mouse (founder) born from the foster parent was cut off and the genomic gene was recovered. PCR confirmed that the “rat JTT-1 antigen” gene had been introduced into the mouse genome. Then, it can be fabricated homomice by crossing of c the hetero mice each other to prepare a terrorist trans diethyl nick mice to high expression of "rat JTT-1 antigen" Ri by the thereby mating a Fuaunda first and normal mice .
- Figure 22 shows a schematic diagram of the microinjected construct containing the “rat JTT-1 antigen” gene.
- a Pstl-Hindlll fragment obtained by digesting a mouse genomic DNA clone containing a region encoding "mouse JTT-1 antigen" cloned in Examples 9-5 with Pstl and HindII It was subcloned into plasmid pGEM-3 (promega). Next, pGEM-3 is opened with Xhol, and the neomycin resistance gene (“neo”) cut out by treating plasmid pMC neo-polyA (manufactured by Stratagene) with Xhol and Sail is placed upstream of the “homologous DNA1”. Inserted and connected.
- neo neomycin resistance gene
- the mouse genomic DNA clone was digested with Xhol and Notl to cut out a gene of about 5.5 kb (“homologous DNA2”) located upstream from the above “homologous DNA1”.
- pGEM-3 into which "neo-homologous DNA II” was inserted was digested with Xhol and Hindi II to cut out "neo-homologous DNA II”.
- the obtained “homologous DNA2” and “neo-homologous DNA1” were subcloned into a plasmid pSEAP2-C0NT (Clontech) opened with Notl and Hindlll.
- the obtained plasmid (having “homologous DNA2—neo—homologous DNA1” inserted) is digested and opened with Nrul downstream of “homologous DNA1”, and then plasmid pMC-TK (manufactured by Stratagene) ) was digested with PvuI I, and the thymidine kinase gene ("TK") was inserted downstream of "homologous DNA II” and ligated. Is inserted).
- ES cells were seeded maintenance medium in the (10 cm), (containing G418 (250 ⁇ G / ml) and cancer Shikurobiru) selective medium medium was replaced. Thereafter, the medium was exchanged every two days and cultured. Evening—On day 10 after introduction of the targeting vector, 573 neomycin-resistant ES cell clones were obtained under a microscope using a microbit. The obtained ES cell clones were separately cultured in a 24-well plate on which Feeder cells were spread, thereby obtaining 768 replicas of neomycin-resistant ES cells.
- the PCR includes (1) a primer designed and synthesized based on the sequence of the neomycin resistance gene (“neo") (5'-CGTGATATTGCTGMGAGCTTGGCGGCGMTGGGC-3, SEQ ID NO: 11)) and the "homologous DNA"
- neo neomycin resistance gene
- the PCR consists of one cycle of a reaction of 3 minutes at 94 ° C, 1 minute at 94 ° C, 1 minute at 60 ° C, and 3 minutes and 30 seconds at 72 ° C. After one cycle of the reaction for 30 minutes at 72 and at 10 minutes at 72, the mixture was stored at 4 ° C.
- a fragment of about 4 kb is amplified by this PCR, it is considered that the ES cell clone has disrupted (knocked out) the endogenous gene encoding “mouse JTT-1 antigen” by homologous recombination. I can judge.
- the desired PCR product was obtained in 3 clones.
- Genomic southern blotting was performed on these three clones, and further selected and confirmed.
- the genomic DNA of the three clones was extracted, digested with a restriction enzyme BaiiiHI, and then electrophoresed on an agarose gel. This was transferred to a nylon membrane, and hybridization was performed using a probe prepared based on the genomic DNA sequence of “mouse JTT-1”.
- the probe was designed based on the sequence outside the site where the homologous recombination occurs, so that the size of the mutant genome can be distinguished from that of the normal genome.
- the endogenous gene encoding the “mouse JTT-1 antigen” obtained above was homologously recombined.
- the inactivated (knock-out) ES cells were injected (microinjection) into blastocysts obtained by mating male and female C57BL6 mice (Charles River Japan) at a rate of 15 cells per embryo.
- C57BL6 mice Male and female C57BL6 mice (Charles River Japan)
- Immediately after the injection about 10 blastocysts per side of the uterus were implanted into the uterus of a foster parent ICR mouse (CLEA Japan) 2.5 days after the pseudopregnancy treatment.
- CLMA Japan foster parent ICR mouse
- the obtained chimeric mouse was bred with a normal C57BL6 mouse to obtain an agouti-colored mouse derived from a hair color gene derived from ES cells.
- JTT-1 antigen The novel cell surface molecule (referred to as "JTT-1 antigen") derived from mammals such as human, mouse and rat provided by the present invention has the following characteristics.
- CD28 which is a cell surface molecule of lymphocytes such as T cells that transmit costimulatory signals important for T cell activation through cell-cell adhesion, and activated T in conjunction with the signal It has the following similarities to “CTLA-4” which is a cell surface molecule of lymphocytes such as T cells that control the function of activated lymphocytes such as cells.
- JTT-1 antigen is used for thymocytes, lymphoblasts and thymoma cells stimulated with mitogens such as ConA. Has the ability to mediate cell-cell adhesion.
- lymphoblast cells activated T lymphoblasts and activated B lymphoblasts stimulated with mitogens such as ConA, peripheral blood lymphocytes and thymoma cells.
- Antibodies directed against the “JTT-1 antigen” significantly proliferate human peripheral blood lymphocytes, and the proliferation is caused by the first signal from antigen-presenting cells essential for T cell activation. Higher proliferation is induced by the coexistence of a monoclonal antibody against CD3, which constitutes the TcR / CD3 complex on the receiving T cells.
- the “JTT-1 antigen” of the present invention like the aforementioned “CD28” and “CTLA-4”, comprises a second signal (costimulatory) essential for activation of lymphocytes such as T cells. It is thought to be a molecule that transmits a tree signal) and controls the function of activated lymphocytes such as activated T cells in conjunction with the signal.
- the polypeptide, polypeptide fragment, fusion polypeptide and antibody of the present invention that constitute such a cell surface molecule may cause abnormal activation of lymphocytes such as T cells and control of the functions of activated lymphocytes.
- lymphocytes such as T cells
- Various autoimmune diseases, allergic diseases or inflammatory diseases, specifically rheumatoid arthritis, multiple sclerosis, self-immune thyroiditis, allergic contact dermatitis, chronic inflammatory skin diseases Treatment or prognosis of lichen planus, systemic lupus erythematosus, insulin-dependent diabetes mellitus and psoriasis It is possible to provide a drug that is extremely useful for prevention.
- the gene encoding the polypeptide or the polypeptide fragment of the present invention not only enables gene therapy for the various diseases, but also can provide an antisense drug.
- human monoclonal antibodies and pharmaceutical compositions thereof are the major problems (side effects) in the therapeutic use of antibody drugs composed of antibodies derived from non-human mammals such as mouse-derived antibodies. Since it has no antigenicity at all, it dramatically increases its value as a pharmaceutical product.
- the gene (DNA), polypeptide, polypeptide fragment and antibody of the present invention are not only useful as pharmaceuticals, but also search for molecules (ligands) that interact with the cell surface molecule of the present invention, and the function of the ligand.
- the present invention is useful as a reagent for elucidating the above and for developing a therapeutic agent targeting the ligand.
- the transgenic mouse of the present invention is useful not only as a model animal for elucidating the physiological function of the cell surface molecule of the present invention, “JTT-1 antigen”, but also as a “JTT-1 antigen”. It is extremely useful as a tool for screening various drugs (such as low-molecular-weight compounds, antibodies, antisense, and polypeptides) that have the activity of controlling (inhibiting, suppressing, activating, stimulating, etc.) That is, such a test substance is administered to the transgenic mouse, and the physiological, biological or pharmacological parameters occurring in the living body of the mouse are measured and analyzed. It is possible to evaluate the activity of the test substance.
- drugs such as low-molecular-weight compounds, antibodies, antisense, and polypeptides
- the knockout mouse of the present invention is characterized by analyzing the characteristics of the mouse from various aspects (physiological, biological, pharmacological, pathological, genetic, etc.). It is possible to elucidate the function of surface molecules. Sequence listing
- Sequence type nucleic acid
- Organism name human
- TTC TGG TTA CCC ATA GGA TGT GCA GCC TTT 450 Phe Trp Leu Pro lie Gly Cys Ala Ala Phe
- Organism name human
- Sequence type nucleic acid
- Sequence type Origin of other nucleic acids (cDNA containing 3 'and 5' terminal base sequence)
- Organism name human
- Sequence type nucleic acid
- Sequence type Origin of other nucleic acids (cDNA containing 3 'and 5' terminal base sequence)
- Organism name rat
- TTCCCCTGA TTAAAATGTTAGCGGAC GGGACAT GAACTA CCCCCCGAGG
- Sequence type nucleic acid
- Organism name mouse
- TCT TGT AAA TAC CCT GAG ACT GTC CAG CAG 150 Ser Cys Lys Tyr Pro Glu Thr Val Gin Gin
- Sequence type nucleic acid
- Sequence type Origin of other nucleic acids (cDNA containing 3 'and 5' terminal base sequence)
- Organism name rat
- AAA AAG TCC AGA CTT GCA GGT ACA GCA CCC 634 Lys Lys Ser Arg Leu Ala Gly Thr Ala Pro
- Sequence type nucleic acid
- Sequence type Other nucleic acids (synthetic DNA)
- Sequence type nucleic acid
- Sequence type Other nucleic acids (synthetic DNA)
- Sequence type nucleic acid
- Sequence type Other nucleic acids (synthetic DNA)
- Sequence type nucleic acid
- Sequence type Other nucleic acids (synthetic DNA)
- Sequence type nucleic acid
- Sequence type Other nucleic acids (synthetic DNA)
- Sequence type Other nucleic acids (synthetic DNA)
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Description
Claims
Priority Applications (32)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL13158498A IL131584A0 (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesio and signal transmission |
DK98905708T DK0984023T3 (da) | 1997-02-27 | 1998-02-27 | Celleoverflademolekyle, som formidler celleadhæsion og signaloverförsel |
BRPI9807788-0A BR9807788B1 (pt) | 1997-02-27 | 1998-02-27 | vetor de plasmìdeo geneticamente engenheirado, célula de bactéria geneticamente engenheirada, e.coli geneticamente engenheirada, polipeptìdeo de fusão, molécula de homodìmero e composição farmacêutica. |
SI9830880T SI0984023T1 (sl) | 1997-02-27 | 1998-02-27 | Molekula celične površine, ki posreduje celično adhezijo in prenos signala |
NZ337425A NZ337425A (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesion and signal transmission |
EP98905708A EP0984023B9 (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesion and signal transmission |
HU0001579A HU227722B1 (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesion and signal transmission |
DE69837658T DE69837658T2 (de) | 1997-02-27 | 1998-02-27 | Zelloberflächenmolekül, das zelladhäsion und signalübertragung vermittelt |
AU61185/98A AU732378B2 (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesion and signal transmission |
CA002282727A CA2282727C (en) | 1997-02-27 | 1998-02-27 | Cell surface molecule mediating cell adhesion and signal transmission |
IL131584A IL131584A (en) | 1997-02-27 | 1999-08-25 | Undetected cleansed antibody, preparations containing it and isolated cells producing it |
US09/383,551 US7030225B1 (en) | 1997-02-27 | 1999-08-26 | Antibodies to JTT-1 protein, cells secreting such antibodies, and methods of making such antibodies |
NO19994146A NO327500B1 (no) | 1997-02-27 | 1999-08-26 | Polypeptid som utgjor et celleoverflatemolekyl, polypeptidfragment, gen, vektor, transformant, fusjonspolypeptid, homodimert molekyl, farmasoytisk preparat, antistoff, eller del av dette, hybridom, transgen mus samt knockout-mus. |
US09/561,308 US7112655B1 (en) | 1997-02-27 | 2000-04-28 | JTT-1 protein and methods of inhibiting lymphocyte activation |
HK00105622A HK1026433A1 (en) | 1997-02-27 | 2000-09-06 | Cell surface molecule mediating cell adhesion and signal transmission |
US10/107,868 US20020156242A1 (en) | 1997-02-27 | 2002-03-26 | Cell surface molecule mediating cell adhesion and signal transmission |
US10/107,907 US20020151685A1 (en) | 1997-02-27 | 2002-03-26 | Cell surface molecule mediating cell adhesion and signal transmission |
US10/107,828 US7045615B2 (en) | 1997-02-27 | 2002-03-26 | Nucleic acids encoding JTT-1 protein |
US10/301,056 US20030083472A1 (en) | 1997-02-27 | 2002-11-21 | Cell surface molecule mediating cell adhesion and signal transmission |
US10/704,072 US7217792B2 (en) | 1997-02-27 | 2003-11-07 | JTT-1 protein and methods of inhibiting lymphocyte activation |
US10/704,030 US7279560B2 (en) | 1997-02-27 | 2003-11-07 | Antibody fragments to JTT-1 protein and cells secreting such antibody fragments |
US10/704,056 US7226909B2 (en) | 1997-02-27 | 2003-11-07 | Methods of inhibiting transmission of a costimulatory signal of lymphocytes |
US10/704,426 US7196175B2 (en) | 1997-02-27 | 2003-11-07 | Antibodies to JTT-1 protein and cells secreting such antibodies |
US10/723,602 US7247612B2 (en) | 1997-02-27 | 2003-11-25 | Methods of treating an inflammatory disease with a JJT-1 polypeptide |
US10/721,404 US7294473B2 (en) | 1997-02-27 | 2003-11-25 | Methods of identifying substances that interact with JTT-1 protein |
US10/794,344 US7259147B2 (en) | 1997-02-27 | 2004-03-05 | Methods of treating multiple sclerosis with a JTT-1 polypeptide |
US10/798,195 US20040151669A1 (en) | 1997-02-27 | 2004-03-11 | Cell surface molecule mediating cell adhesion and signal transmission |
NO20073155A NO331064B1 (no) | 1997-02-27 | 2007-06-20 | Farmasoytisk preparat |
US11/938,753 US7932358B2 (en) | 1997-02-27 | 2007-11-12 | Antibodies to JTT-1 protein and cells secreting such antibodies |
NO20092369A NO20092369L (no) | 1997-02-27 | 2009-06-18 | Polypeptid som utgjor et celleoverflatemolekyl, polypeptidfragment, gen, vektor, transformant, fusjonspolypeptid, homodimert molekyl, farmasoytisk preparat, antistoff eller del av dette, hybridom og transgen mus |
IL206603A IL206603A0 (en) | 1997-02-27 | 2010-06-24 | Cell surface molecule mediating cell adhesion and signal transmission |
US13/023,880 US8389690B2 (en) | 1997-02-27 | 2011-02-09 | Antibodies to JTT-1 protein and cells secreting such antibodies |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/62290 | 1997-02-27 | ||
JP6229097 | 1997-02-27 | ||
JP06221798A JP3521382B2 (ja) | 1997-02-27 | 1998-02-26 | 細胞間接着及びシグナル伝達を媒介する細胞表面分子 |
JP10/62217 | 1998-02-26 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/383,551 Continuation-In-Part US7030225B1 (en) | 1997-02-27 | 1999-08-26 | Antibodies to JTT-1 protein, cells secreting such antibodies, and methods of making such antibodies |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998038216A1 true WO1998038216A1 (fr) | 1998-09-03 |
Family
ID=26403281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/000837 WO1998038216A1 (fr) | 1997-02-27 | 1998-02-27 | Molecule de surface cellulaire induisant l'adhesion cellulaire et la transmission de signaux |
Country Status (20)
Country | Link |
---|---|
US (10) | US7030225B1 (ja) |
EP (2) | EP0984023B9 (ja) |
JP (1) | JP3521382B2 (ja) |
KR (1) | KR100349388B1 (ja) |
CN (3) | CN100400546C (ja) |
AT (1) | ATE360645T1 (ja) |
AU (1) | AU732378B2 (ja) |
BR (1) | BR9807788B1 (ja) |
CA (1) | CA2282727C (ja) |
DE (1) | DE69837658T2 (ja) |
DK (1) | DK0984023T3 (ja) |
ES (1) | ES2285763T3 (ja) |
HK (2) | HK1026433A1 (ja) |
ID (1) | ID23386A (ja) |
IL (3) | IL131584A0 (ja) |
NO (3) | NO327500B1 (ja) |
NZ (1) | NZ337425A (ja) |
PT (1) | PT984023E (ja) |
SI (1) | SI0984023T1 (ja) |
WO (1) | WO1998038216A1 (ja) |
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