Overexpression of long non-coding RNA HOTAIR leads to chemoresistance by activating the Wnt/β-catenin pathway in human ovarian cancer

Overexpression of HOTAIR (HOX antisense intergenic RNA) is significantly correlated with tumor progression and poor prognosis in human ovarian cancer. However, the underlying mechanisms are largely unknown. In the present study, we investigated the roles of HOTAIR in the initiation and chemoresistance of ovarian cancer. As our data show, HOTAIR overexpression promoted cell cycle progression (and thus cell proliferation) by activating the wnt/beta-catenin signaling pathway. Likewise, knockdown of HOTAIR suppressed cell proliferation and arrested cell cycle at G1 phase via inhibition of wnt/beta-catenin signaling. Moreover, the results of primary culture demonstrated that elevated HOTAIR expression correlated positively with chemoresistance in ovarian cancer. In vitro and in vivo, HOTAIR induced cellular resistance to cisplatin by activating the wnt/beta-catenin pathway, which could be reversed by pre-treatment with the wnt/beta-catenin inhibitor, XAV939. In conclusion, HOTAIR promotes the initiation and chemoresistance of ovarian cancer by activating wnt/beta-catenin signaling, suggesting that HOTAIR might be a potent therapeutic target for ovarian cancer treatment.