Twa1/Gid8 is a β-catenin nuclear retention factor in Wnt signaling and colorectal tumorigenesis.

Twa1/Gid8 is a β-catenin nuclear retention factor in Wnt signaling and colorectal tumorigenesis.
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Twa1/Gid8 是 Wnt 信号传导和结直肠肿瘤发生中的 β-连环蛋白核保留因子

DOI:
10.1038/cr.2017.107
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发表时间:
2017-12
期刊:
影响因子:
44.1
通讯作者:
Zhou T
Zhou T
中科院分区:
生物学1区
文献类型:
--
作者:
Lu Y;Xie S;Zhang W;Zhang C;Gao C;Sun Q;Cai Y;Xu Z;Xiao M;Xu Y;Huang X;Wu X;Liu W;Wang F;Kang Y;Zhou T

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Wnt/β-catenin信号通路的过度激活是人类结直肠癌(CRC)的主要原因之一。Wnt信号传导的标志是β-连环蛋白的核积累。虽然β-catenin的核输入和输出已被广泛研究,但β-catenin的核滞留的潜在机制仍然很大程度上未知。在这里,我们报告Twa 1/Gid 8是Wnt信号传导和结直肠癌发生过程中β-catenin的关键核滞留因子。在缺乏Wnt的情况下,Twa 1与β-catenin一起存在于Axin复合物中,并经历泛素化和降解。在Wnt信号传导后,Twa 1易位到细胞核中,在那里它结合并保留β-连环蛋白。Twa 1的缺失减弱Wnt刺激的基因表达,斑马鱼胚胎的背部发育和CRC细胞的异种移植肿瘤生长。此外,核Twa 1在人CRC组织中显著上调,与β-连环蛋白的核积聚和不良预后相关。因此,我们的研究结果确定Twa 1作为一个以前未描述的Wnt通路的调节因子,通过促进β-连环蛋白核滞留来促进结直肠肿瘤的发生。
Hyperactivation of Wnt/β-catenin signaling is one of the major causes of human colorectal cancer (CRC). A hallmark of Wnt signaling is the nuclear accumulation of β-catenin. Although β-catenin nuclear import and export have been widely investigated, the underlying mechanism of β-catenin's nuclear retention remains largely unknown. Here, we report that Twa1/Gid8 is a key nuclear retention factor for β-catenin during Wnt signaling and colorectal carcinogenesis. In the absence of Wnt, Twa1 exists together with β-catenin in the Axin complex and undergoes ubiquitination and degradation. Upon Wnt signaling, Twa1 translocates into the nucleus, where it binds and retains β-catenin. Depletion of Twa1 attenuates Wnt-stimulated gene expression, dorsal development of zebrafish embryos and xenograft tumor growth of CRC cells. Moreover, nuclear Twa1 is significantly upregulated in human CRC tissues, correlating with the nuclear accumulation of β-catenin and poor prognosis. Thus, our results identify Twa1 as a previously undescribed regulator of the Wnt pathway for promoting colorectal tumorigenesis by facilitating β-catenin nuclear retention.
RanBP3 独立于 CRM1 增强活性 (β)-连环蛋白的核输出。
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