MicroRNA-145 suppresses epithelial to mesenchymal transition in pancreatic cancer cells by inhibiting TGF-β signaling pathway

TGF-β signaling plays a critical role in tumor progression and many approaches have been made to inhibit its functions. MicroRNA is one of the approaches that inhibit TGF-β signaling and can be used as a promising treatment for cancer. This study explored the role of miRNA-145 in pancreatic cancer (PC) development. The expression of miRNA-145 in PC tissues and paired adjacent normal tissues was examined by qRT-PCR. The expression of miRNA-145 in PC cells and the ability of cell migration and invasion were detected both in vivo and in vitro. The results showed that miRNA-145 was down-regulated in PC tissues and PC cells. Increasing the expression of miRNA-145 in PC cells inhibited the TGF-β signaling pathway and epithelial-mesenchymal transition (EMT) process. Scratch assay and transwell assay showed that miRNA-145 inhibited the migration and invasion in PC cells. In vivo experiments confirmed that miRNA-145 mimics delayed the growth of PC xenografts comparing with miRNA-145 inhibitor. Our results suggested that miRNA-145 can inhibit epithelial to mesenchymal transition (EMT) and tumor growth by suppressing TGF-β signaling pathway. Thus, miRNA-145 could be a potential therapeutic for targeting TGF-β signaling in PC treatment.