SHP-2磷酸酶负向调节TRIF衔接蛋白依赖性I型干扰素和促炎细胞因子的产生。

SHP-2 phosphatase negatively regulates the TRIF adaptor protein-dependent type I interferon and proinflammatory cytokine production.

作者信息

An Huazhang, Zhao Wei, Hou Jin, Zhang Yan, Xie Yun, Zheng Yuejuan, Xu Hongmei, Qian Cheng, Zhou Jun, Yu Yizhi, Liu Shuxun, Feng Gensheng, Cao Xuetao

机构信息

Institute of Immunology and National Key Laboratory of Medical Immunology, Second Military Medical University, Shanghai 200433, People's Republic of China.

出版信息

Immunity. 2006 Dec;25(6):919-28. doi: 10.1016/j.immuni.2006.10.014. Epub 2006 Dec 7.

Abstract

The Toll-like receptor 3 (TLR3) and TLR4-signaling pathway that involves the adaptor protein TRIF activates type I interferon (IFN) and proinflammatory cytokine expression. Little is known about how TRIF pathway-dependent gene expression is regulated. SH2-containing protein tyrosine phosphatase 2 (SHP-2) is a widely expressed cytoplasmic tyrosine phosphatase. Here we demonstrate that SHP-2 negatively regulated TLR4- and TLR3-activated IFN-beta production. SHP-2 inhibited TLR3-activated but not TLR2-, TLR7-, and TLR9-activated proinflammatory cytokine IL-6 and TNF-alpha production. SHP-2 inhibited poly(I:C)-induced cytokine production by a phosphatase activity-independent mechanism. C-terminal domain of SHP-2 directly bound TANK binding kinase (TBK1) by interacting with the kinase domain of TBK1. SHP-2 deficiency increased TBK1-activated IFN-beta and TNF-alpha expression. TBK1 knockdown inhibited poly(I:C)-induced IL-6 production in SHP-2-deficient cells. SHP-2 also inhibited poly(I:C)-induced activation of MAP kinase pathways. These results demonstrate that SHP-2 specifically negatively regulate TRIF-mediated gene expression in TLR signaling, partially through inhibiting TBK1-activated signal transduction.

摘要

包含衔接蛋白TRIF的Toll样受体3(TLR3)和TLR4信号通路可激活I型干扰素(IFN)和促炎细胞因子的表达。关于TRIF通路依赖性基因表达是如何调控的,目前所知甚少。含SH2结构域的蛋白酪氨酸磷酸酶2(SHP-2)是一种广泛表达的细胞质酪氨酸磷酸酶。在此,我们证明SHP-2负向调控TLR4和TLR3激活的IFN-β产生。SHP-2抑制TLR3激活的促炎细胞因子IL-6和TNF-α的产生,但不抑制TLR2、TLR7和TLR9激活的。SHP-2通过一种不依赖磷酸酶活性的机制抑制聚肌苷酸-聚胞苷酸(poly(I:C))诱导的细胞因子产生。SHP-2的C末端结构域通过与TANK结合激酶(TBK1)的激酶结构域相互作用,直接结合TBK1。SHP-2缺陷会增加TBK1激活的IFN-β和TNF-α表达。敲低TBK1可抑制SHP-2缺陷细胞中poly(I:C)诱导的IL-6产生。SHP-2还抑制poly(I:C)诱导的丝裂原活化蛋白激酶(MAP)激酶途径的激活。这些结果表明,SHP-2在TLR信号传导中特异性地负向调节TRIF介导的基因表达,部分是通过抑制TBK1激活的信号转导实现的。

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