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Cancer Res. 2011 Oct 1;71(19):6208-19. doi: 10.1158/0008-5472.CAN-11-0073. Epub 2011 Aug 18.

MicroRNA-708 induces apoptosis and suppresses tumorigenicity in renal cancer cells.

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  • 1Department of Urology, Veterans Affairs Medical Center, San Francisco, California 94121, USA.

Abstract

Cancer pathogenesis is restricted by stresses that compromise cell division and survival. In this study, we identify miR-708, a little studied member of a set of microRNAs that have been implicated in stress control, as an important tumor suppressor in renal cell carcinoma (RCC). miR-708 expression was attenuated widely in human RCC specimens. Restoration of miR-708 expression in RCC cell lines decreased cell growth, clonability, invasion, and migration and elicited a dramatic increase in apoptosis. Moreover, intratumoral delivery of miR-708 was sufficient to trigger in vivo regression of established tumors in murine xenograft models of human RCC. Investigation of the targets of miR-708 identified the inhibitor of apoptosis protein survivin as important. siRNA-mediated knockdown of survivin partially phenocopied miR-708 overexpression suggesting that the proapoptotic role of miR-708 may be mediated primarily through survivin regulation. Additionally, we identified the E-cadherin regulators ZEB2 and BMI1 as likely miR-708 targets. Taken together, our findings define a major tumor suppressive role for miR-708, which may offer an attractive new target for prognostic and therapeutic intervention in RCC.

PMID:
21852381
[PubMed - indexed for MEDLINE]
PMCID:
PMC3940359
Free PMC Article
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