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Long non-coding RNA TUG1 regulates ovarian cancer proliferation and metastasis via affecting epithelial-mesenchymal transition.

Ovarian cancer is the fifth leading cause of cancer-related death in women worldwide, and recent studies have highlighted the role of long non-coding RNAs (lncRNAs) in cancer development. However, the role of lncRNAs in ovarian cancer is largely unclear. In this study, we focused on the taurine up-regulated gene 1 (TUG1) and examined its molecular mechanism in ovarian cancer. Here, we reported that TUG1 was up-regulated in ovarian cancer tissues and ovarian cancer cells, and TUG1 expression was positively correlated with tumor grade and FIGO stage. In vitro functional assays (CCK-8 assay, colony formation assay, and cell invasion assay) revealed that knock-down of TUG1 by small RNA inference significantly inhibited cell proliferation, colony formation and cell invasion in ovarian cancer cells. Further experiment showed that knock-down of TUG1 induced cell apoptosis and altered the protein expression levels of apoptosis-related mediators in ovarian cancer cells. More importantly, knock-down of TUG1 also reversed epithelial-mesenchymal transition in ovarian cancer. In summary, our results suggest that knock-down of TUG1 may represent a novel therapeutic strategy for the treatment of ovarian cancer.

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