Regulation of HOXA11-AS/miR-214-3p/EZH2 axis on the growth, migration and invasion of glioma cells

Background: Glioma is one of the most common and aggressive malignant tumors in central nervous system. Recently, long non-coding RNA (lncRNA) HOXA11-AS has been reported to be an oncogenic gene in multiple cancers. However, the molecular mechanisms of HOXA11-AS involved in cancer progression of human glioma remain unknown. Materials and methods: The expression levels of HOXA11-AS in 45 paired primary glioma tissues and cell lines were examined by quantitative real-time PCR, and the correlation between HOXA11-AS expression and clinicopathologic characteristics of patients with glioma were analyzed. HOXA11-AS was knockdown in glioma cells by transfection with HOXA11-AS siRNA, and cell proliferation, migration and invasion were detected. The tumor growth of xenografts with HOXA11-AS knockdown glioma cells was also analyzed. Results: The expression levels of HOXA11-AS were significantly up-regulated in glioma tissues and cell lines compared with that in adjacent normal brain tissues and normal human astrocytes (NHA). High expression of HOXA11-AS was correlated with shorter overall survival in patients with glioma. Knockdown of HOXA11-AS inhibited glioma cell proliferation, migration and invasion in vitro, and tumor growth in vivo. In addition, we demonstrated that HOXA11-AS functioned as a competing endogenous RNA (ceRNA) for miR-214-3p, which in turn positively regulated the expression of its direct target EZH2. Conclusions: We demonstrated that HOXA11-AS acted as an oncogenic lncRNA that promoted cell growth and metastasis of glioma through regulating miR-214-3p/EZH2 axis. These results suggested HOXA11-AS may serve as an efficient marker and a potential therapeutic target for glioma.