EGF-reduced Wnt5a transcription induces epithelial-mesenchymal transition via Arf6-ERK signaling in gastric cancer cells.
EGF-reduced Wnt5a transcription induces epithelial-mesenchymal transition via Arf6-ERK signaling in gastric cancer cells.
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EGF 减少的 Wnt5a 转录通过 Arf6-ERK 信号在胃癌细胞中诱导上皮间质转化
DOI:
10.18632/oncotarget.3133
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发表时间:
2015-03-30
期刊:
影响因子:
--
通讯作者:
Gu L
中科院分区:
文献类型:
--
作者:
Zhang Y;Du J;Zheng J;Liu J;Xu R;Shen T;Zhu Y;Chang J;Wang H;Zhang Z;Meng F;Wang Y;Chen Y;Xu Y;Gu L
Wnt5a, a ligand for activating the non-canonical Wnt signaling pathway, is commonly associated with Epithelial-to-mesenchymal transition (EMT) in cancer cell metastasis. Here, we show that downregulation of Wnt5a mRNA and protein by EGF is necessary for EGF-induced EMT in gastric cancer SGC-7901 cells. To further explore the mechanisms, we investigated the effect of EGF signaling on Wnt5a expression. EGF increased Arf6 and ERK activity, while blockade of Arf6 activation repressed ERK activity, up-regulated Wnt5a expression and repressed EMT in response to EGF. We also demonstrate that EGF inactivated Wnt5a transcription by direct recruitment of ERK to the Wnt5a promoter. On the other hand, inhibition of ERK phosphorylation resulted in decreased movement of ERK from the cytoplasm to the nucleus, following rescued Wnt5a mRNA and protein expression and favored an epithelial phenotype of SGC-7901 cells. In addition, we notice that kinase-dead, nuclear-localised ERK has inhibitory effect on Wnt5a transcription. Analysis of gastric cancer specimens revealed an inverse correlation between P-ERK and Wnt5a protein levels and an association between Wnt5a expression and better prognosis. These findings indicate that Wnt5a is a potential suppressor of EMT and identify a novel Arf6/ERK signaling pathway for EGF-regulated Wnt5a expression at transcriptional level of gastric cancer cells.
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DOI:
10.1073/pnas.0806465105
发表时间:
2008-09-09
影响因子:
11.1
作者:
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通讯作者:
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通讯作者:
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影响因子:
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作者:
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