Different modes of ubiquitination of the adaptor TRAF3 selectively activate the expression of type I interferons and proinflammatory cytokines.

Different modes of ubiquitination of the adaptor TRAF3 selectively activate the expression of type I interferons and proinflammatory cytokines.
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DOI:
10.1038/ni.1819
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发表时间:
2010-01
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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已经提出了在Toll样受体(TLR)接合时I型干扰素(IFN)和促炎细胞因子的平衡产生来控制自身免疫性疾病的发病机制和肿瘤对炎症的反应,Toll样受体(TLR)通过含有Toll-IL-1-受体(TIR)结构域的衔接子(如MyD 88和TRIF)发出信号。在这里,我们表明,TRAF 3,泛素连接酶与MyD 88和TRIF相互作用,差异调节IFN和促炎细胞因子的产生。在MyD 88依赖性TLR信号传导过程中,TRAF 3泛素化降解对于丝裂原活化蛋白激酶(MAPK)的活化和炎性细胞因子的产生至关重要。相比之下,TRIF依赖性信号传导触发非经典TRAF 3自身泛素化,激活IFN应答。降解TRAF 3泛素化的抑制阻止了所有促炎细胞因子的表达,而不影响IFN应答。
Balanced production of type I interferons (IFN) and proinflammatory cytokines upon engagement of Toll-like receptors (TLRs), which signal via adaptors containing a Toll-IL-1-Receptor (TIR) domain, such as MyD88 and TRIF, has been proposed to control the pathogenesis of autoimmune disease and tumor responses to inflammation. Here we show that TRAF3, a ubiquitin ligase that interacts with both MyD88 and TRIF, differentially regulated production of IFN and proinflammatory cytokines. Degradative TRAF3 ubiquitination during MyD88-dependent TLR signaling was essential for activation of mitogen-activated protein kinases (MAPKs) and inflammatory cytokine production. By contrast, TRIF-dependent signaling triggered non-canonical TRAF3 self-ubiquitination that activated the IFN response. Inhibition of degradative TRAF3 ubiquitination prevented expression of all proinflammatory cytokines without impacting the IFN response.
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