USP4 targets TAK1 to downregulate TNFα-induced NF-κB activation.

USP4 targets TAK1 to downregulate TNFα-induced NF-κB activation.
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USP4靶向TAK1以下调TNFα诱导的NF-κB激活。

DOI:
10.1038/cdd.2011.11
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发表时间:
2011-10
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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TAK 1的Lys 63连接的多泛素化在TNFα诱导的NF-κB活化中起重要作用。使用功能基因组学方法,我们已经确定了泛素特异性肽酶4(USP 4)作为TAK 1的去泛素化酶。USP 4在体外和体内使TAK 1去泛素化。TNFα诱导USP 4与TAK 1结合,使TAK 1去泛素化,并下调TAK 1介导的NF-κB活化。USP 4野生型的过表达,而不是氘代喹啉酶缺陷型C311 A突变体,抑制TNFα和TAK 1/TAB 1共过表达诱导的TAK 1多聚泛素化和NF-κB活化。值得注意的是,在HeLa细胞中敲低USP 4增强了TNFα诱导的TAK 1多聚泛素化、IKK磷酸化、IκBα磷酸化和泛素化以及NF-κ B依赖性基因表达。此外,USP 4负性调节IL-1β、LPS和TGFβ诱导的NF-κB活化。总之,我们的研究结果表明,USP 4作为一个关键的控制下调TNFα诱导的NF-κB激活通过去泛素化的TAK 1。
Lys63-linked polyubiquitination of TAK1 plays an important role in TNFα-induced NF-κB activation. Using a functional genomic approach, we have identified Ubiquitin Specific Peptidase 4 (USP4) as a deubiquitinase for TAK1. USP4 deubiquitinates TAK1 in vitro and in vivo. TNFα induces association of USP4 with TAK1 to deubiquitinate TAK1 and downregulate TAK1-mediated NF-κB activation. Overexpression of USP4 wild-type, but not deuibiquitinase-deficient C311A mutant, inhibits both TNFα- and TAK1/TAB1 co-overexpression-induced TAK1 polyubiquitination and NF-κB activation. Notably, knockdown of USP4 in HeLa cells enhances TNFα-induced TAK1 polyubiquitination, IKK phosphorylation, IκBα phosphorylation and ubiquitination as well as NF-κB-dependent gene expression. Moreover, USP4 negatively regulates IL-1β-, LPS-and TGFβ-induced NF-κB activation. Together, our results demonstrate that USP4 serves as a critical control to downregulate TNFα-induced NF-κB activation through deubiquitinating TAK1.
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