Deubiquitinating enzyme CYLD negatively regulates the ubiquitin-dependent kinase Tak1 and prevents abnormal T cell responses.

Deubiquitinating enzyme CYLD negatively regulates the ubiquitin-dependent kinase Tak1 and prevents abnormal T cell responses.
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DOI:
10.1084/jem.20062694
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发表时间:
2007-06-11
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Sun SC
Sun SC
中科院分区:
其他
文献类型:
--
作者:
Reiley WW;Jin W;Lee AJ;Wright A;Wu X;Tewalt EF;Leonard TO;Norbury CC;Fitzpatrick L;Zhang M;Sun SC

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去泛素化酶CYLD最近被认为参与信号转导的调控,但其生理功能和作用机制仍不明确。在本研究中,我们表明CYLD在调节T细胞活化和内稳态中起关键作用。来自Cyld基因敲除小鼠的T细胞呈现出高反应性表型,并介导肠道炎症的自发发展。有趣的是,CYLD作用于一种泛素依赖性激酶——转化生长因子-β激活激酶1(Tak1),并抑制其泛素化和自身活化。Cyld缺陷型T细胞表现出Tak1及其下游激酶c - Jun N -末端激酶和IκB激酶β组成性活化。这些结果强调了CYLD在防止T细胞信号转导的Tak1轴自发激活,从而维持正常T细胞功能方面的关键作用。
The deubiquitinating enzyme CYLD has recently been implicated in the regulation of signal transduction, but its physiological function and mechanism of action are still elusive. In this study, we show that CYLD plays a pivotal role in regulating T cell activation and homeostasis. T cells derived from Cyld knockout mice display a hyperresponsive phenotype and mediate the spontaneous development of intestinal inflammation. Interestingly, CYLD targets a ubiquitin-dependent kinase, transforming growth factor–β-activated kinase 1 (Tak1), and inhibits its ubiquitination and autoactivation. Cyld-deficient T cells exhibit constitutively active Tak1 and its downstream kinases c-Jun N-terminal kinase and IκB kinase β. These results emphasize a critical role for CYLD in preventing spontaneous activation of the Tak1 axis of T cell signaling and, thereby, maintaining normal T cell function.
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