Exo70 isoform switching upon epithelial-mesenchymal transition mediates cancer cell invasion.

Exo70 isoform switching upon epithelial-mesenchymal transition mediates cancer cell invasion.
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EXO70同工型转换上皮 - 间质转变会介导癌细胞侵袭。

DOI:
10.1016/j.devcel.2013.10.020
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发表时间:
2013-12-09
期刊:
影响因子:
11.8
通讯作者:
Guo, Wei
Guo, Wei
中科院分区:
生物学1区
文献类型:
--
作者:
Lu, Hezhe;Liu, Jianglan;Liu, Shujing;Zeng, Jingwen;Ding, Deqiang;Carstens, Russ P.;Cong, Yusheng;Xu, Xiaowei;Guo, Wei

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上皮-间质转化(Epithelial-mesenchymal transition, EMT)是癌细胞传播的重要发育过程。在这里,我们发现Exo70(胞囊复合体的一个组成部分)经历了由ESRP1介导的异构体转换,ESRP1是一种调节EMT的mrna前剪接因子。Exo70上皮异构体的表达影响关键EMT转录调控因子(如Snail和ZEB2)的水平,并足以驱动向上皮表型的转变。人类肿瘤中Exo70异构体的差异表达与癌症进展相关,在小鼠中,Exo70上皮异构体的表达增加可抑制肿瘤转移。在分子水平上,Exo70的间质异构体而非上皮异构体与Arp2/3复合物相互作用并刺激肌动蛋白聚合以促进肿瘤侵袭。我们的发现提供了一种机制,通过这种机制,胞囊功能和肌动蛋白动力学被调节为EMT和肿瘤侵袭。
Epithelial-mesenchymal transition (EMT) is an important developmental process hijacked by cancer cells for their dissemination. Here we show that Exo70, a component of the exocyst complex, undergoes isoform switching mediated by ESRP1, a pre-mRNA splicing factor that regulates EMT. Expression of the epithelial isoform of Exo70 affects the levels of key EMT transcriptional regulators such as Snail and ZEB2, and is sufficient to drive the transition to epithelial phenotypes. Differential Exo70 isoforms expression in human tumors correlates with cancer progression, and increased expression of the epithelial isoform of Exo70 inhibits tumor metastasis in mice. At the molecular level, the mesenchymal but not the epithelial isoform of Exo70 interacts with the Arp2/3 complex and stimulates actin polymerization for tumor invasion. Our findings provide a mechanism by which the exocyst function and actin dynamics are modulated for EMT and tumor invasion.
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