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  • Title: miR-146a functions as a tumor suppressor in prostate cancer by targeting Rac1.
    Author: Sun Q, Zhao X, Liu X, Wang Y, Huang J, Jiang B, Chen Q, Yu J.
    Journal: Prostate; 2014 Dec; 74(16):1613-21. PubMed ID: 25214035.
    Abstract:
    BACKGROUND: miR-146a (miR-146a-5p) has been reported to be aberrantly expressed in different types of cancers, the current knowledge about the role of miR-146a in prostate cancer is still limited. METHODS: The expression levels of miR-146a in cell lines and tissues were measured by qRT-PCR and in situ hybridization. Effects of miR-146a on cell growth and migration were evaluated by colony formation assay and RTCA assay, respectively. The dual luciferase assay was used to examine the binding between miR-146a and the 3'UTR of potential targets. RESULTS: We found that enforced over-expression of miR-146a in prostate cancer cells suppressed whereas knockdown of miR-146a increased anchorage-independent growth, migration, and invasion. Mechanistic studies revealed that miR-146a repressed the expression of Rac1 through binding to its 3'UTR. Consistently, knockdown of Rac1 phenocopied the anti-migration effect of overexpressing miR-146a, and knockdown of Rac1 in miR-146a-silencing cells antagonized the increase in cell motility induced by silencing miR-146a. Furthermore, miR-146a was found to be inversely correlated with Rac1 in human prostate cancer tissues. CONCLUSIONS: Our data suggest that miR-146a plays a suppressive role in prostate cancer through down-regulation of Rac1. The miR-146a/Rac1 signaling axis may be a potential therapeutic target to prevent prostate cancer progression.
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