MiR-194 Regulates Cisplatin Resistance in Colorectal Cancer Cells Through Targeting Yes-Associated Protein

Abstract

Elevated Yes-associated protein (YAP1) expression is associated with colorectal cancer. Bioinfor-matics analysis showed a targeting relationship between miR-194 and YAP13′-UTR. Our study assessed miR-194’s role in proliferation, apoptosis, and CDDP resistance of colorectal cancer cells. The CDDP-resistant cell line SW480/CDDP was established and miR-194 and YAP1 level in parental SW480 cells and normal intestinal epithelial HCoEpiC cells was measured. SW480/CDDP cells were separated into control group, miR-NC group and miR-194 mimic group followed by analysis of miR-194 and YAP1 level, cell apoptosis and proliferation by flow cytometry. There was a targeted regulatory relationship between miR-194 and YAP1 mRNA. miR-194 was significantly upregulated in SW480/CDDP cells compared to SW480 cells and downregulated in SW480 cells compared to HCoEpiC cells. Whereas, opposite YAP1 expression profiles were found in SW480/CDDP, SW480 and HCoEpiC cells. miR-194 mimic significantly upregulated miR-194 in the SW480/CDDP cells, with decreased YAP1 expression, increased cell apoptosis, decreased cell proliferation and reduced IC50. Decreased miR-194 and increased YAP1 expression involve in CDDP resistance of colorectal cancer. Increase of miR-194 expression can inhibit colorectal cancer cell proliferation, promote apoptosis and reduce CDDP resistance by down-regulating YAP1 expression.