Long non-coding RNA ENST00000457645 reverses cisplatin resistance in CP70 ovarian cancer cells.

: The objective of this study was to investigate the effect of downregulating long non-coding RNAs (lncRNAs) on the reversal of cisplatin resistance in CP70 ovarian cancer cells, and to identify the underlying mechanism(s) of action. An lncRNA microarray was performed to screen for downregulated lncRNAs in cisplatin-resistant CP70 cells. Expression levels of these lncRNAs were then verified in SKOV3 and SKOV3/DDP cells. Quantitative polymerase chain reaction was conducted to identify the lncRNA most downregulated, which was then synthesized and transfected into CP70 cells. To assess the viability and migration ability of these transfected CP70 cells, methyl thiazolyl tetrazolium and Transwell assays were carried out. In addition, expression levels of apoptosis-related proteins were examined by western blotting. The lncRNA microarray analysis and qPCR identified seven lncRNAs that were significantly downregulated. Transfection of lncRNA ENST00000457645 into CP70 cells markedly inhibited viability and migration ability, and significantly increased expression of apoptotic proteins such as Bax and cleaved caspase-3. lncRNA ENST00000457645 negatively affects the viability and migration of cisplatin-resistant CP70 ovarian cancer cells. The mechanism responsible involves modification of apoptotic protein expression.