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HuR Stabilizes lnc-Sox5 mRNA to Promote Tongue Carcinogenesis.

Long noncoding RNAs (lncRNAs) have been recently regarded as systemic regulators in multiple biological processes including tumorigenesis. In this study, we report an ultra-highly expressed lncRNA, lnc-Sox5, in tongue tumor tissues. The results imply that lnc-Sox5 may play vital role in tongue carcinoma progression. We observed that the growth of Tca8113 cells was suppressed by lnc-Sox5 downregulation. Additionally, lnc-Sox5 knockdown simultaneously increased Tca8113 cell apoptosis, but the cell cycle was arrested. RNA immunoprecipitation suggested that HuR directly bound to and stabilized lnc-Sox5 RNA. Consistently, HuR knockdown reduced the level of lnc-Sox5 in Tca8113 cells. However, overexpression of HuR induced more lnc-Sox5 in Tca8113 cells. Both lnc-Sox5 knockdown and HuR knockdown suppressed Tca8113 cell tumorigenesis in xenograft models. These results suggest that lnc-Sox5, which was stabilized by HuR, could regulate carcinogenesis of tongue cancer and may serve as a predicted target for tongue carcinoma therapies.

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