对活细胞毒性T淋巴细胞T细胞抗原受体-连接体相互作用的CD8调节
I F Luescher1, E Vivier, A Layer
1Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland.
Nature
|January 26, 1995
概括
CD8分子通过协调与主要基因相容性复合体 (MHC) I 类分子的相互作用,显著增强T细胞受体 (TCR) 连接体结合力. 这种CD8-TCR相互作用调节T细胞激活动态和温度依赖.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 细胞毒性T淋巴细胞 (CTLs) 主要表达α/β CD8异构体.
- CD8与MHC I类分子的非多态区域相互作用,调解粘附或作为TCR-连接体结合的核心受体.
- 通过CD8增强TCR-连接体相互作用的精确机制仍然不完全理解.
研究的目的:
- 调查CD8在加强T细胞受体 (TCR) - 连接体相互作用的激发中的作用.
- 阐明CD8在T细胞激活中的核心受体功能的分子基础.
- 分析CD8对TCR-连接体结合的动力和动态影响.
主要方法:
- 使用光反应性H-2Kd-衍生物复合物的TCR光亲和度标记.
- H-2Kd分子的局部导向突变发生 (用Lys取代Asp 227).
- 在CD8+和CD8-细胞毒性T细胞上对TCR-配体相互作用的动态分析.
主要成果:
- CD8显著增强了克隆细胞毒性T细胞上的TCR-连接体相互作用的激烈性.
- CD8和TCR对联体分子的协调结合解释了增强的狂热度.
- 在H-2Kd中Asp 227的替代损害了TCR-连接物对CD8+细胞的结合,强调了它的重要性.
- CD8 影响TCR-联结体相互作用的动态和温度依赖性.
结论:
- CD8充当一个关键的核心受体,通过协调相互作用增强TCR-连接体结合性.
- CD8-TCR相互作用调节T细胞激活的动力学和热力学.
- CD8的核心受体功能可以通过其与TCR和MHCI类分子的特定相互作用来调节.
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