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    • 5. 发明申请
    • CELL DEATH INDUCER
    • 细胞死亡诱导因子
    • US20100150927A1
    • 2010-06-17
    • US12307042
    • 2007-07-13
    • Naoki KimuraShigeto Kawai
    • Naoki KimuraShigeto Kawai
    • A61K39/395C07K16/28C12N5/0781C12N5/0783A61P35/00A61P37/06
    • C07K16/18A61K2039/505C07K16/2833C07K2317/56C07K2317/565C07K2317/73
    • An objective of the present invention is to provide an antibody having a high cell death-inducing activity. To solve the above-described problems, the present inventors immunized mice with cells expressing human HLA class IA and human β2 microglobulin (β2M) to obtain monoclonal antibodies. Screening of the obtained antibodies was performed to obtain ten clones of antibodies having a cell death-inducing activity. Analyses of these clones revealed that three of the clones (antibodies C3B3, C11B9, and C17D11), which have the α2 domain of the HLA class I antigen as an epitope, showed a stronger cytotoxic activity when crosslinked with an anti-mouse IgG antibody. Furthermore, when a C3B3 diabody was generated, this diabody was revealed to show a stronger anti-tumor effect compared with conventional diabodies of the 2D7 antibody, which is an HLA class IA antibody.
    • 本发明的目的是提供具有高细胞死亡诱导活性的抗体。 为了解决上述问题,本发明人用表达人类HLAⅠA型和人类2微球蛋白(& 2M)的细胞免疫小鼠以获得单克隆抗体。 进行所得抗体的筛选,得到10个具有细胞死亡诱导活性的抗体克隆。 这些克隆的分析显示,当用抗小鼠IgG抗体交联时,具有HLA I类抗原的α2结构域作为表位的三个克隆(抗体C3B3,C11B9和C17D11)显示出更强的细胞毒性活性。 此外,当产生C3B3双抗体时,与作为HLA 1A类抗体的2D7抗体的常规双抗体相比,该双抗体显示出更强的抗肿瘤效果。
    • 8. 发明申请
    • Chimeric Fc-gamma Receptor and Method for Determination of ADCC Activity by Using the Receptor
    • 嵌合Fc-γ受体和使用受体测定ADCC活性的方法
    • US20100035280A1
    • 2010-02-11
    • US12525031
    • 2008-01-30
    • Shigeto Kawai
    • Shigeto Kawai
    • G01N33/567C07K14/705C07H21/04C12N15/63C12N5/10
    • G01N33/566C07K14/70535C07K16/18C07K2317/24C07K2317/41C07K2317/52C07K2317/732C07K2319/00G01N33/5014G01N2500/04G01N2500/10
    • An objective of the present invention is to provide chimeric receptors containing a mouse Fcγ receptor extracellular domain and a human Fcγ receptor transmembrane domain, or chimeric receptors containing a mouse Fcγ receptor extracellular domain and a human γ chain transmembrane domain. Another objective of the present invention is to provide methods for measuring the ADCC activity of mouse antibodies and methods of screening for mouse antibodies having ADCC activity, using the chimeric receptors.To accomplish the above-mentioned objectives, the present inventors produced chimeric molecules by fusing the extracellular domain of mouse FcγR3 or mouse FcγR4 with the transmembrane domain/intracellular domain of human γ chain or human FcγR3, and expressed the chimeric molecules in human NK92 cells. It was revealed that the ADCC activity can be induced by the chimeric receptors produced by any combination of the domains, and that the ADCC activity of mouse antibodies can be measured using the chimeric receptors of the present invention.
    • 本发明的目的是提供含有小鼠Fcγ受体细胞外结构域和人Fcγ受体跨膜结构域的嵌合受体或含有小鼠Fcγ受体细胞外结构域和人γ链跨膜结构域的嵌合受体。 本发明的另一个目的是提供使用嵌合受体测量小鼠抗体的ADCC活性的方法和筛选具有ADCC活性的小鼠抗体的方法。 为了实现上述目的,本发明人通过将小鼠FcgammaR3或小鼠FcγR4的细胞外结构域与人γ链或人FcγR3的跨膜结构域/细胞内结构域融合而产生嵌合分子,并在人NK92细胞中表达嵌合分子。 显示AD​​CC活性可以由通过结构域的任何组合产生的嵌合受体诱导,并且可以使用本发明的嵌合受体来测量小鼠抗体的ADCC活性。