ZEB1 induced miR-99b/let-7e/miR-125a cluster promotes invasion and metastasis in esophageal squamous cell carcinoma

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.

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