LncRNA PCAT6 increased cholangiocarcinoma cell proliferation and invasion via modulating miR-330-5p.

Long non-coding RNAs (lncRNAs) act important roles in several tumors including cholangiocarcinoma. However, the expression pattern and function of PCAT6 in intrahepatic cholangiocarcinoma remains unknown. In our research, we showed that the PCAT6 expression level was upregulated in intrahepatic cholangiocarcinoma cell lines. The expression of PCAT6 in intrahepatic cholangiocarcinoma tissues than that in noncancerous samples and the higer expression of PCAT6 was associated with advanced stage. Ectopic expression of PCAT6 induced cell proliferation and invasion in cholangiocarcinoma cell. Moreover, we demonstrated that PCAT6 interacts with miR-330-5p by directly targeting and PCAT6 overexpression inhibited the expression of miR-330-5p in the ICC-9810 cell. We also showed that the expression level of miR-330-5p in intrahepatic cholangiocarcinoma samples was downregulated compared to noncancerous tissues. Interesting, we proved that the miR-330-5p expression was negative correlated with PCAT6 expression in intrahepatic cholangiocarcinoma. Ectopic expression of miR-330-5p suppressed cell proliferation and invasion. Finally, we showed that PCAT6 induced cell proliferation and invasion by decreasing miR-330-5p in cholangiocarcinoma cell. Taken together, these data suggested that lncRNA PCAT6 was an oncogenic player in the development of intrahepatic cholangiocarcinoma.