The common region of lncRNAs UCA1 and UCA1 contributes to the bladder cancer tumorigenesis

Accumulating evidence suggests that the long noncoding RNAs (lncRNAs) urothelial cancer associated 1 (UCA1) and urothelial cancer associated 1 alpha (UCA1 alpha) play a critical role in the development and progression of bladder cancer. However, the detailed mechanism, in particular the role of the common region of UCA1 and UCA1 alpha, termed UCA1 same sequence (USS, approximately 1265 bp), remains unknown. To address this, the full length of 1265 bp USS was obtained initially, and then produced pcDNA3.1(+)-based overexpression vectors and designed siRNAs for UCA1, UCA1 alpha, and USS, and assessed their effects on the human bladder cancer cell lines UMUC3 (which does not express UCA1 and UCA1 alpha) and 5637 (which has high expression of UCA1 and UCA1 alpha), respectively. Overexpression of UCA1, UCA1 alpha, and USS significantly increased bladder cancer cell proliferation and the number of S-phase cells, but significantly decreased cell apoptosis and the number of G0/G1 phase cells. Consistently, silencing UCA1 and USS significantly decreased bladder cancer cell proliferation and the number of S phase cells, but significantly increased apoptosis and the number of G0/G1 phase cells. These results suggest that USS, the common region of UCA1 and UCA1 alpha, can promote bladder cancer tumorigenesis by increasing cell proliferation and decreasing cell apoptosis in a similar way to UCA1 and UCA1 alpha lncRNAs. This not only transforms our understanding of the role of UCA1, UCA1 alpha, and their common region in tumorigenesis, but may also provide a new target for future clinical applications.