Deubiquitination of Dishevelled by Usp14 is required for Wnt signaling.

Deubiquitination of Dishevelled by Usp14 is required for Wnt signaling.
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DOI:
10.1038/oncsis.2013.28
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发表时间:
2013-08-19
期刊:
影响因子:
6.2
通讯作者:
Jho, E-h
Jho, E-h
中科院分区:
医学1区
文献类型:
--
作者:
Jung, H.;Kim, B-G;Han, W. H.;Lee, J. H.;Cho, J-Y;Park, W. S.;Maurice, M. M.;Han, J-K;Lee, M. J.;Finley, D.;Jho, E-h

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Disheveled(DVL)在典型和非典型途径中都是Wnt信号的关键调节因子。在这里,我们报告了DVL C末端泛素化调节结构域(RDU)的鉴定。RDU突变导致DVL多泛素化形式的积累,这些形式主要与K63连锁。基于小干扰RNA的筛选证实Usp14是DVL去泛素化的介体。Usp14活性的遗传和化学抑制导致DVL多泛素化增加,并显著损害下游Wnt信号。这些数据表明,Usp14是Wnt信号通路的正向调节因子。对结肠癌的组织芯片分析一致地显示,USP14和β-连环蛋白的水平之间有很强的相关性,这表明USP14通过增强WNT/β-连环蛋白信号而发挥致癌作用。
Dishevelled (Dvl) is a key regulator of Wnt signaling both in the canonical and non-canonical pathways. Here we report the identification of a regulatory domain of ubiquitination (RDU) in the C-terminus of Dvl. Mutations in the RDU resulted in accumulation of polyubiquitinated forms of Dvl, which were mainly K63 linked. Small interfering RNA-based screening identified Usp14 as a mediator of Dvl deubiquitination. Genetic and chemical suppression of Usp14 activity caused an increase in Dvl polyubiquitination and significantly impaired downstream Wnt signaling. These data suggest that Usp14 functions as a positive regulator of the Wnt signaling pathway. Consistently, tissue microarray analysis of colon cancer revealed a strong correlation between the levels of Usp14 and β-catenin, which suggests an oncogenic role for Usp14 via enhancement of Wnt/β-catenin signaling.
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