-MHC复合物的低亲和力相互作用与T细胞受体
K Matsui1, J J Boniface, P A Reay
1Howard Hughes Medical Institute, Stanford, CA.
概括
T细胞受体 (TCRs) 与低亲和度的-MHC连接体结合,这表明粘附在特定抗原识别之前. 这影响了对免疫反应和T细胞扫描行为的理解.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 通过识别-MHC复合体,T细胞受体 (TCR) 通过调解适应性免疫.
- 对于TCR-联结体相互作用的化学特征和结合亲和力还没有得到充分的了解.
- 了解TCR结合对于破译免疫反应启动至关重要.
研究的目的:
- 调查与-MHC配体的TCR相互作用的结合亲和和和化学特征.
- 要确定TCR结合是否特定于特定的和TCR.
- 探索TCR结合亲和力对T细胞识别机制的影响.
主要方法:
- 使用标记的单克隆抗体向TCR进行结合测试.
- 采用可溶性II类MHC异构体复合与各种作为配体.
- 测量了抗体与T细胞结合的抑制,以量化TCR-配体亲和力.
主要成果:
- 观察到-MHC复合体对TCR抗体结合的抑制.
- 抑制证明了和TCR的特异性.
- 对于TCR--MHC相互作用,确定了较低的结合亲和力 (KD = 4 x 10(-5) 到 6 x 10(-5) M).
- 这种亲和力明显低于典型的抗体-抗原相互作用.
结论:
- TCR--MHC相互作用表现出低亲和力,不同于高亲和力抗体-抗原结合.
- 低亲和力支持涉及扫描的T细胞识别模型,并先于特定的TCR参与.
- 在T细胞激活过程中,在发生特定的TCR-连接体结合之前,抗原独立的粘附可能起作用.
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