Publication date: 10 July 2017
Source:Cancer Letters, Volume 398
Author(s): Jianlin Ma, Yun Zhan, Zhipeng Xu, Yi Li, Aiping Luo, Fang Ding, Xiufeng Cao, Hongyan Chen, Zhihua Liu
Esophageal squamous cell carcinoma (ESCC) is one of the most common digestive tumors in Asia. Recent researches demonstrate that miRNAs are involved in the development of ESCC. In this study, we identified a miRNA cluster, termed miR-99b/let-7e/miR-125a as pro-metastasis oncomir. Overexpression of this miRNA cluster promoted ESCC cell migration and invasion in vitro and induced an experimental metastasis in vivo. ZEB1 was discovered to bind to the promoter region of miR-99b/let-7e/miR-125a cluster and regulate the expression of miRNAs at transcriptional level. Knockdown of ZEB1 resulted in a decrease of both mature and primary miRNAs. Further research revealed AT-rich interaction domain 3A (ARID3A) as a direct target of miR-99b/let-7e/miR-125a cluster. Reduced ARID3A phenocopied miR-99b/let-7e/miR-125a overexpression, and elevated ARID3A counteracted the pro-metastasis effect of miR-99b/let-7e/miR-125a. Moreover, ARID3A was downregulated by ZEB1 in a miR-99b/let-7e/miR-125a dependent manner. Collectively, our study sheds light on the essential role of miR-99b/let-7e/miR-125a cluster in tumor metastasis.
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