The magnitude of LFA-1/ICAM-1 forces fine-tune TCR-triggered T cell activation.

The magnitude of LFA-1/ICAM-1 forces fine-tune TCR-triggered T cell activation.
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DOI:
10.1126/sciadv.abg4485
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发表时间:
2022-02-25
期刊:
影响因子:
13.6
通讯作者:
Salaita K
Salaita K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ma VP;Hu Y;Kellner AV;Brockman JM;Velusamy A;Blanchard AT;Evavold BD;Alon R;Salaita K

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T细胞通过快速扫描靶细胞表面寻找特异性肽抗原来防御癌症和病毒感染。获得性免疫中的这一关键过程是在T细胞受体(TCR)结合由整联蛋白(LFA-1)/细胞间粘附分子-1(ICAM-1)复合物稳定的细胞-细胞连接内的抗原时引发的。在这一领域的一个长期存在的问题是,通过LFA-1/ICAM-1复合物传递的力是否调节T细胞信号传导。在这里,我们使用光谱编码的DNA张力探针,揭示了抗原识别后T细胞细胞骨架产生的LFA-1和TCR力的第一个地图。控制LFA-1力大小的DNA探针显示,F>12 pN通过增强T细胞-底物接合来增强抗原依赖性T细胞活化。F>12 pN的LFA-1/ICAM-1机械事件也增强了TCR在与近同源抗原一起呈递时的辨别能力。总的来说,我们的研究结果表明,T细胞通过不同的配体-受体对整合多个机械信息通道来调节功能。基于DNA的张力探针揭示了LFA-1力的大小调节T细胞活化。
T cells defend against cancer and viral infections by rapidly scanning the surface of target cells seeking specific peptide antigens. This key process in adaptive immunity is sparked upon T cell receptor (TCR) binding of antigens within cell-cell junctions stabilized by integrin (LFA-1)/intercellular adhesion molecule–1 (ICAM-1) complexes. A long-standing question in this area is whether the forces transmitted through the LFA-1/ICAM-1 complex tune T cell signaling. Here, we use spectrally encoded DNA tension probes to reveal the first maps of LFA-1 and TCR forces generated by the T cell cytoskeleton upon antigen recognition. DNA probes that control the magnitude of LFA-1 force show that F>12 pN potentiates antigen-dependent T cell activation by enhancing T cell–substrate engagement. LFA-1/ICAM-1 mechanical events with F>12 pN also enhance the discriminatory power of the TCR when presented with near cognate antigens. Overall, our results show that T cells integrate multiple channels of mechanical information through different ligand-receptor pairs to tune function. DNA-based tension probes reveal that the magnitude of LFA-1 forces tune T cell activation.
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