A TCR mechanotransduction signaling loop induces negative selection in the thymus.

A TCR mechanotransduction signaling loop induces negative selection in the thymus.
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DOI:
10.1038/s41590-018-0259-z
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发表时间:
2018-12
期刊:
影响因子:
30.5
通讯作者:
Zhu C
Zhu C
中科院分区:
医学1区
文献类型:
--
作者:
Hong J;Ge C;Jothikumar P;Yuan Z;Liu B;Bai K;Li K;Rittase W;Shinzawa M;Zhang Y;Palin A;Love P;Yu X;Salaita K;Evavold BD;Singer A;Zhu C

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胸腺细胞上表达的T细胞抗原受体(TCR)与自身肽-主要组织相容性复合物(pMHC)配体相互作用以发出凋亡或存活信号。在这里,我们发现,负选择配体诱导胸腺细胞对TCR和辅助受体CD 8施加力,并形成合作的TCR-pMHC-CD 8三分子“捕获键”,而正选择配体诱导持续时间较短的胸腺细胞对TCR和CD 8的力,并形成寿命较短,独立的TCR-pMHC和pMHC-CD 8双分子“滑动键”。捕获键不是反式(交叉连接)异二聚体的TCR-pMHC或pMHC-CD 8臂固有的,而是通过相关激酶将细胞外pMHC-CD 8相互作用偶联至CD 8与TCR-CD 3的细胞内相互作用以形成能够由内向外信号传导的顺式(侧向)异二聚体而产生的。我们认为,耦合反-顺异二聚体的相互作用形成一个机械转导回路,加强负选择信号,这是从胸腺中的正选择信号不同。
The T cell antigen receptor (TCR) expressed on thymocytes interacts with self peptide-major histocompatibility complex (pMHC) ligands to signal apoptosis or survival. Here we found that negative-selection ligands induced thymocytes to exert forces on the TCR and the coreceptor CD8 and formed cooperative TCR–pMHC–CD8 trimolecular ‘catch bonds’, whereas positive-selection ligands induced less sustained thymocyte forces on TCR and CD8 and formed shorter-lived, independent TCR–pMHC and pMHC–CD8 bimolecular ‘slip bonds’. Catch bonds were not intrinsic to either the TCR–pMHC or the pMHC–CD8 arm of the trans (cross-junctional) heterodimer but resulted from coupling of the extracellular pMHC–CD8 interaction to the intracellular interaction of CD8 to TCR-CD3 via associated kinases to form a cis (lateral) heterodimer capable of inside-out signaling. We suggest that the coupled trans-cis heterodimeric interactions form a mechanotransduction loop that reinforces negative-selection signaling that is distinct from positive-selection signaling in the thymus.
CD8BETA通过将T细胞受体/CD3与筏相关的CD8/p56(LCK)配合物耦合,使CD8具有有效的共感受器功能。
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