MicroRNA-193b inhibits the proliferation, migration and invasion of gastric cancer cells via targeting cyclin D1.

MicroRNAs have been involved in RNA silencing and post-transcriptional regulation of gene expression and also play important roles in tumorigenesis and tumor progression. MiR-193b was previously reported to act as tumor suppressor in diverse cancers. However, little is known about the expression, function and mechanism of miR-193b in gastric cancer (GC). In this study, we investigated the expression of miR-193b in 50 GC cases and found that miR-193b was significantly reduced in GC tissues compared with the adjacent normal gastric tissues. Moreover, lower-level of miR-193b was also associated with a more aggressive GC phenotype. We further demonstrated that miR-193b can inhibit the proliferation, migration and invasion of HGC-27 and MGC-803 GC cells. Further mechanism study indicated that CCND1 was a direct target of miR-193b in GC. Overexpression of miR-193b inhibited the expression of CCND1, and knock-down of CCND1 inhibited the proliferation of GC cells, suggesting that miR-193b exerted its anti-tumorigenic role in GC cells through targeting CCND1 gene.