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强力诱导的特定部位的酶分离探针显示,连续的机械参与会增加T细胞激活
Jhordan Rogers1, Rong Ma1, Yuesong Hu1
1Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia, 30322, USA.
bioRxiv : the preprint server for biology
|August 23, 2023
概括
新的力探测器显示,机械力的持续时间对T细胞激活至关重要. 较短的力持续时间会抑制T细胞的反应,这突显了在免疫识别中重复的机械采样的重要性.
科学领域:
- 免疫学 免疫学 免疫学
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- T细胞激活依赖于与主要基因相容性复合体 (pMHCs) 相互作用的T细胞受体 (TCRs).
- 机械力和它们在TCR-pMHC相互作用期间的持续时间显著影响T细胞激活保真度.
- 了解力持续时间的作用对于破译免疫反应机制至关重要.
研究的目的:
- 开发一种新的方法来研究力持续时间对T细胞激活的影响.
- 创建能够在定义的时间窗口内自主控制和终止机械张力的力探头.
主要方法:
- 开发强力诱导的特定地点酶分离 (FUSE) 探针.
- FUSE探测器使用强力触发的内核酶水解来调整张力持续时间.
- 选DNA序列以识别FUSE探针破坏TCR-pMHC相互作用的特定力值 (例如>7.1pN) 以上的DNA序列.
主要成果:
- FUSE探测器使调节力寿命 (τF) 从几分钟降至1.9分钟.
- 暴露于1.9分钟的tF的FUSE探针的T细胞显示早期激活标记物减少.
- 重复的机械采样 (>7.1 pN) 对T细胞激活至关重要,特别是在较低的pMHC密度下 (23%的下降,tF为1.9分钟).
- 响应较高力 (>17.0 pN) 的FUSE探针的效果较弱,这表明这些相互作用的频率较低.
结论:
- FUSE探针提供了一种新的方法来研究力持续时间对T细胞激活和机械传导的影响.
- 这些发现支持一个模型,其中TCRs的连续机械参与对于有效的抗原识别至关重要.
- 力量持续时间,而不仅仅是大小,在T细胞免疫反应的敏感性和结果中起着关键作用.
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