Long non-coding RNA CDKN2B antisense RNA 1 gene inhibits Gemcitabine sensitivity in bladder urothelial carcinoma.

Objective: To investigate the clinical significance of long noncoding RNA (IncRNA) CDKN2B antisense RNA 1 (CDKN2B-AS) gene and its effects on Gemcitabine sensitivity in BUC. Materials and Methods: The expression of CDKN2B-AS gene was examined with real-time quantitative PCR. The cell proliferation and the half maximal inhibitory concentration (IC50) of Gemcitabine were detected with enhanced CCK-8 assay. The apoptosis rate was examined using Annexin V-FITC/PI double-staining apoptosis kit. The protein expression was examined with western blotting. The activity of Wnt signaling pathway was examined with TOP/FOP luciferase assay. Results: CDKN2B-AS gene was high-expressed in BUC tissues and J82, T24 cells compared with paracancerous normal urothelial tissues and SV-HUC-1 cells. Furthermore, the high-expression of CDKN2B-AS gene was related with high pathological grade and low Gemcitabine sensitivity of BUC tissues. The expression of CDKN2B-AS gene in Gemcitabine-resistant T24/Gem cells was much higher than that in T24 cells. Knockdown of CDKN2B-AS gene sensitized T24/Gem cells to Gemcitabine, promoted Gemcitabine-induced cytotoxicity. Knockdown of CDKN2B-AS gene inactivated Wnt signaling pathway, and Wnt signaling pathway mediated the effects on Gemcitabine sensitivity induced by CDKN2B-AS knockdown in T24/Gem cells. Conclusion: LncRNA CDKN2B-AS is high-expressed in BUC and related to low Gemcitabine sensitivity of BUC. CDKN2B-AS inhibited Gemcitabine sensitivity through Wnt signaling pathway in BUC.