在TCR结合后,T细胞的辅助刺激和抑制信号二次调节LAT凝聚物核化倾向
Saehyun Choi1, Sungi Kim1, Jessica Tijham1
1Department of Chemistry, University of California, Berkeley; Berkeley, CA 94720, USA.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
造价刺激信号 (CD80/CD86) 在T细胞受体 (TCR) 激活后加速激活T细胞激活链接器 (LAT) 凝聚物形成. 抑制PD-L1具有轻微的对抗作用,影响T细胞信号动态.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞信号传输 细胞信号传输
- 生物物理学的生物物理.
背景情况:
- 激活T细胞的连接剂 (LAT) 是T细胞受体 (TCR) 信号传导中的关键支架蛋白.
- 在TCR激活后,在单分子水平上观察到LAT组装成信号凝聚物.
- 这种凝结过程表现出相变的特征,在特定的延迟后发生.
研究的目的:
- 调查共刺激性 (CD80,CD86) 和抑制性 (PD-L1) 配体如何影响LAT凝聚的核化倾向.
- 量化这些连接体对TCR激活和LAT凝结物形成之间的延迟时间的影响.
- 为了建立一个链接之间的联体介导信号和LAT凝聚物的随机核化.
主要方法:
- 利用单分子运动跟踪精确识别pMHC:TCR结合事件.
- 采用细胞内成像来测量TCR结合到LAT凝结核的时间延迟.
- 分析了延迟时间分布以确定核化倾向和有效信号强度.
主要成果:
- 通过CD80或CD86进行CD28辅助刺激,显著减少了LAT凝聚的平均延迟时间.
- PD-L1对LAT凝聚核化表现出轻微的对抗作用.
- 对LAT核化时间的依赖于质的调制为信号集成提供了洞察力.
结论:
- LAT核形成的概率和时间由辅助刺激和抑制信号严格调节.
- 这些发现突显了LAT凝聚力学在从单个TCR激活事件传播信号中的作用.
- 调节LAT凝结提供了微调T细胞反应的潜在机制.
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