MiR-92b regulates the cell growth, cisplatin chemosensitivity of A549 non small cell lung cancer cell line and target PTEN.

MicroRNAs (miRNAs) have emerged to play important roles in tumorigenesis and drug resistance of human cancer. Fewer studies were explored the roles of miR-92b on human lung cancer cell growth and resistance to cisplatin (CDDP). In this paper, we utilized real-time PCR to verify miR-92b was significantly up-regulated in non-small cell lung cancer (NSCLC) tissues compared to matched adjacent normal tissues. In vitro assay demonstrated that knock-down of miR-92b inhabits cell growth and sensitized the A549/CDDP cells to CDDP. Furthermore, we found miR-92b could directly target PTEN, a unique tumor suppressor gene, which was downregulated in lung cancer tissues compared to the matched adjacent normal tissues. These data indicate that the miR-92b play an oncogene roles by regulates cell growth, cisplatin chemosensitivity phenotype, and could serve as a novel potential maker for NSCLC therapy.