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原生C3在没有蛋白质分解裂变的情况下通过在脂杂细胞膜上转化为C3 (H2O) 而被激活
David Eikrem1, Vivek A Manivel1, Jacob Whittaker2
1Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.
原生C3直接与激活的血小板和细胞结合,启动替代补充途径. 这种结合将C3转化为C3 (H2O),绕过缓慢的滴答,并促进血栓炎症中的细胞化.
科学领域:
- 免疫学 免疫学 免疫学
- 补充系统生物学 补充系统生物学
- 血小板炎症 血小板炎症
背景情况:
- 通过C3点击启动的替代补充途径的启动是缓慢的,缺乏特异性.
- C3 ((H2O) 在血栓炎症疾病中被发现与激活的血小板和内皮细胞结合.
- C3 ((H2O) 与这些表面结合的机制尚不清楚.
研究的目的:
- 研究C3,C3b和C3 (H2O) 与激活血小板的结合机制.
- 确定本地C3作为改变自我的直接识别分子的作用.
- 阐明在血栓炎症中启动替代补充途径的原因.
主要方法:
- 对C3,C3b和C3 (H2O) 暴露于活性血小板和模型脂质体.
- 使用附件V和properdin进行结合的评估.
- 使用新表位,冷-TEM和QCM-D.分析C3形状和转化酶形成.
主要成果:
- 原生C3对激活血小板的结合率最高,导致有效的C3bBb转化酶形成.
- 安素V抑制了C3结合,而柏丁则增强了它.
- 脂质体结合的C3采用了类似于C3 (H2O) 的形状,能够形成C3bBb转化酶.
结论:
- 原生C3在激活的血小板和细胞上直接识别暴露的脂,在没有裂变的情况下转化为C3 (H2O).
- 这种相互作用是替代补充途径的关键启动者.
- 原生C3充当了改变自我的直接识别分子,在血栓炎症条件下调解细胞化.
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