T细胞与受体的亲和力和胸细胞的阳性选择
S M Alam1, P J Travers, J L Wung
1Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA.
Nature
|June 13, 1996
概括
对T细胞受体 (TCR) 与-MHC复合体的结合亲和力决定了胸细胞选择结果. 一个特定的亲和度窗口促进了积极的选择,而更高的亲和度触发了负面的选择,指导T细胞的发育.
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:
- 胸细胞的发育涉及积极和消极的选择,对于适应性免疫至关重要.
- 这些选择过程是由T细胞受体 (TCR) 对-MHC复合物的识别触发的.
- 在竞争的定量和定性模型中,区分选择结果仍然是一个挑战.
研究的目的:
- 调查TCR-连接体相互作用动力学在确定胆小细胞选择结果中的作用.
- 区分T细胞选择的定量和定性模型.
- 为了确定TCR结合亲和力和选择命运之间的直接相关性.
主要方法:
- 使用表面等离子体共振 (SPR) 来测量TCR相互作用的动力学.
- 使用SPR分析了TCR与积极和消极选择-MHC配体的结合.
- 分析了定量动力学数据,以评估结合亲和力及其与选择结果的关系.
主要成果:
- 结合TCR的亲和力与胸细胞选择的结果直接相关.
- 一个定义的"窗口"的TCR-连接物亲和力促进了积极的选择.
- 这种积极选择窗口开始于比诱导负面选择的亲和力低三倍的亲和力.
结论:
- 与-MHC配体的TCR相互作用的亲和力是胸细胞选择的关键决定因素.
- 定量模型,特别是TCR结合亲和力,足够地解释了积极和消极选择的不同结果.
- 这些发现为了解T细胞谱的发展和对自身免疫和免疫治疗的潜在影响提供了机制基础.
相关概念视频
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