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    • 22. 发明授权
    • P-40 homodimer of interleukin-12
    • 白细胞介素-12的P-40同型二聚体
    • US5650492A
    • 1997-07-22
    • US424682
    • 1995-04-18
    • Maurice Kent GatelyJohn HakimiPing Ling
    • Maurice Kent GatelyJohn HakimiPing Ling
    • A61K38/00A61K38/19A61K38/20A61P3/08A61P9/00A61P29/00A61P37/06A61P43/00C07K1/22C07K14/52C07K14/54C07K19/00C12N5/10C12N15/00C12N15/09C12N15/24C12P21/02
    • C07K14/5434A61K38/00Y10S930/141
    • Analysis of the culture media of p40-transfected COS cells indicated the presence of 40 kDa monomers and 80 kDa disulfide-linked homodimers. Examination of partially purified p40 recombinant proteins demonstrated that only the homodimer but not the monomer binds to the IL-12 receptor. Partially purified 80 kDa homodimer inhibited [.sup.125 I]IL-12 binding to PHA-activated human lymphoblasts with an IC.sub.50 of 80 ng/ml, which is similar to the IC.sub.50 value (20 ng/ml) for the human IL-12 heterodimer. Although neither the 40 kDa monomer nor the 80 kDa dimer could stimulate human PHA-blast proliferation, the 80 kDa dimer inhibited IL-12-induced proliferation in a dose-dependent manner with an IC.sub.50 of 1 .mu.g/ml. The IL-12 p40 subunit contains the essential epitopes for receptor binding, but they are only active when p40 is covalently associated with a second protein such as p35 or p40. When p40 is associated with the p35 subunit, the heterodimer acts as an agonist mediating biologic activity. When p40 associates with itself, the homodimer behaves as an antagonist.
    • p40转染的COS细胞的培养基的分析表明存在40kDa的单体和80kDa的二硫键连接的同型二聚体。 部分纯化的p40重组蛋白的检查证明只有同源二聚体而不是单体与IL-12受体结合。 部分纯化的80kDa同源二聚体抑制[125 I] IL-12与PHA激活的人类淋巴母细胞结合,IC 50为80ng / ml,其与人IL-12异源二聚体的IC 50值(20ng / ml)相似。 尽管40kDa单体和80kDa二聚体都不能刺激人类PHA-blast增殖,但是80kDa二聚体以IC50为1μg/ ml以剂量依赖的方式抑制IL-12诱导的增殖。 IL-12 p40亚基含有受体结合的必需表位,但是当p40与第二种蛋白如p35或p40共价结合时,它们仅具有活性。 当p40与p35亚基相关时,异源二聚体起介导生物活性的作用。 当p40与其自身相关时,同型二聚体表现为拮抗剂。