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Song, Peng; Ye, Lin-Feng; Zhang, Cen; Peng, Tao; Zhou, Xu-Hong
Gene, 10/2016, Volume: 592, Issue: 1Journal Article
Long non-coding RNA (lncRNA) X inactivate-specific transcript (XIST) has been verified as an oncogenic gene in several human malignant tumors, and its dysregulation was closed associated with tumor initiation, development and progression. Nevertheless, whether the aberrant expression of XIST in human nasopharyngeal carcinoma (NPC) is corrected with malignancy, metastasis or prognosis has not been elaborated. Here, we discovered that XIST was up-regulated in NPC tissues and higher expression of XIST contributed to a markedly poorer survival time. In addition, multivariate analysis demonstrated XIST was an independent risk factor for prognosis. XIST over-expression enhanced, while XIST silencing hampered the cell growth in NPC. Additionally, mechanistic analysis revealed that XIST up-regulated the expression of miR-34a-5p targeted gene E2F3 through acting as a competitive ‘sponge’ of miR-34a-5p. Taking all into account, we concluded that XIST functioned as an oncogene in NPC through up-regulating E2F3 in part through ‘spongeing’ miR-34a-5p. •XIST is up-regulated in human primary NPC tissues.•Expression of E2F3 is up-regulated in primary human NPC and negatively expressed related to miR-34a-5p.•miR-34a-5p inhibits the tumorigenic potential of NPC cells by down-regulating oncogenic E2F3 gene.•XIST's oncogenic functions are partially through reverse regulation of miRNA-34a-5p, and then activation of E2F3.
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