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    • 4. 发明申请
    • LIGANDS FOR INDUCTION OF ANTIGEN SPECIFIC APOPTOSIS IN T CELLS
    • 用于诱导T细胞中抗原特异性宿主的配体
    • WO1995033770A1
    • 1995-12-14
    • PCT/US1995006726
    • 1995-06-02
    • REPLIGEN CORPORATIONDANA FARBER CANCER INSTITUTE
    • REPLIGEN CORPORATIONDANA FARBER CANCER INSTITUTEGRIBBEN, John, G.FREEMAN, Gordon, J.NADLER, Lee, M.RENNERT, PaulJELLIS, Cindy, L.GREENFIELD, EdwardGRAY, Gary, S.
    • C07K14/705
    • C07K14/70521A61K38/00C07K14/70532C07K16/2818C07K2317/34
    • Isolated ligands which bind a molecule expressed on the surface of T cells and induce antigen specific apoptosis in activated T cells are disclosed. Preferably, the T cell surface molecule is CTLA4 and the ligand is a monoclonal anti-CTLA4 antibody that binds to an epitope of CTLA4 distinct from the binding sites of B7-1 and B7-2. Upon binding of the antibody to CTLA4 on an activated T cell, in the presence of an antigenic signal, antigen specific apoptosis is induced. The invention also describes a novel natural CTLA4 ligand, distinct from B7-1 and B7-2, which mediates induction of apoptosis. Pharmaceutical compositions of anti-CTLA4 antibodies or other isolated CTLA4 ligands which can be administered to subjects to induce T cell apoptosis, thereby clonally deleting antigen specific T cells, such as alloreactive T cells in transplantation situations or autoreactive T cells in autoimmune disorders, are also disclosed. Methods for inducing T cell apoptosis in vitro with an anti-CTLA4 antibody or other ligand of the invention together with an antigen specific signal are also disclosed, e.g., for use in purging alloreactive T cells from donor bone marrow prior to bone marrow transplantation to inhibit graft versus host disease.
    • 公开了结合在T细胞表面上表达并在活化的T细胞中诱导抗原特异性凋亡的分子的分离的配体。 优选地,T细胞表面分子是CTLA4,并且配体是结合与B7-1和B7-2的结合位点不同的CTLA4的表位的单克隆抗CTLA4抗体。 当抗体与CTLA4在活化的T细胞上结合时,在抗原信号存在下,诱导抗原特异性凋亡。 本发明还描述了一种与介导细胞凋亡诱导的B7-1和B7-2不同的新型天然CTLA4配体。 抗CTLA4抗体或其他分离的CTLA4配体的药物组合物也可以被给予受试者诱导T细胞凋亡,从而克隆地删除抗原特异性T细胞,例如移植情况下的同种异体反应性T细胞或自身免疫性疾病中的自身反应性T细胞, 披露。 还公开了用本发明的抗CTLA4抗体或其他配体与抗原特异性信号一起体外诱导T细胞凋亡的方法,例如用于在骨髓移植之前从供体骨髓中清除同种异体反应性T细胞以抑制 移植物抗宿主病。
    • 9. 发明申请
    • ANTIBODIES AND IMMUNOGLOBULIN FUSION PROTEINS HAVING MODIFIED EFFECTOR FUNCTIONS AND USES THEREFOR
    • 具有改良效应功能的抗体和免疫球蛋白融合蛋白及其用途
    • WO1997028267A1
    • 1997-08-07
    • PCT/US1997001698
    • 1997-02-03
    • REPLIGEN CORPORATIONGRAY, Gary, S.CARSON, JerryJAVAHERIAN, KashiJELLIS, Cindy, L.RENNERT, Paul, D.SILVER, Sandra
    • REPLIGEN CORPORATION
    • C12N15/62
    • C07K14/70503A61K38/00A61K2039/5154C07K2319/00
    • CTLA4-immunoglobulin fusion proteins having modified immunoglobulin constant region-mediated effector functions, and nucleic acids encoding the fusion proteins, are described. The CTLA4-immunoglobulin fusion proteins comprise two components: a first peptide having a CTLA4 activity and a second peptide comprising an immunoglobulin constant region which is modified to reduce at least one constant region-mediated biological effector function relative to a CTLA4-IgG1 fusion protein. The nucleic acids of the invention can be integrated into various expression vectors, which in turn can direct the synthesis of the corresponding proteins in a variety of hosts, particularly eukaryotic cells. The CTLA4-immunoglobulin fusion proteins described herein can be administered to a subject to inhibit an interaction between a CTLA4 ligand (e.g., B7-1 and/or B7-2) on an antigen presenting cell and a receptor for the CTLA4 ligand (e.g., CD28 and/or CTLA4) on the surface of T cellsto thereby suppress an immune response in the subject, for example to inhibit transplantation rejection, graft versus host disease or autoimmune responses.
    • 描述了具有修饰的免疫球蛋白恒定区介导的效应子功能的CTLA4-免疫球蛋白融合蛋白,以及编码融合蛋白的核酸。 CTLA4免疫球蛋白融合蛋白包含两个组分:具有CTLA4活性的第一肽和包含免疫球蛋白恒定区的第二个肽,其被修饰以相对于CTLA4-IgG1融合蛋白减少至少一个恒定区介导的生物效应子功能。 本发明的核酸可以整合到各种表达载体中,这又可以指导各种宿主,特别是真核细胞中相应的蛋白质的合成。 本文所述的CTLA4-免疫球蛋白融合蛋白可以施用于受试者以抑制抗原呈递细胞上的CTLA4配体(例如B7-1和/或B7-2)与CTLA4配体的受体(例如, CD28和/或CTLA4),从而抑制受试者的免疫应答,例如抑制移植排斥反应,移植物抗宿主病或自身免疫应答。