MicroRNA-361-5p suppresses cancer progression by targeting signal transducer and activator of transcription 6 in non-small cell lung cancer

The incidence of non-small cell lung cancer (NSCLC) has significantly increased in China, while the prognosis of affected patients is poor. The pathogenesis of NSCLC is thought to be regulated by microRNAs (miRs). The present study used a miR array in order to determine the expression of miR-361-5p, which was significantly lower in NSCLC tissues compared with that in adjacent tissues, indicating a crucial role of miR-361-5p during the progression of NSCLC. Furthermore, the effects of transfection-induced upregulation of miR-361-5p on the NSCLC cell line H23 were assessed. Overexpression of miR-361-5p inhibited the proliferation and colony formation ability of H23 cells. In addition, apoptosis of H23 cells was induced by upregulation of miR-361-5p. Furthermore, signal transducer and activator of transcription 6 (STAT6) was confirmed as a direct target of miR-361-5p by a dual-luciferase reporter assay. Moreover, inhibition of STAT6 by small interfering RNA or miR-361-5p also decreased the expression of B-cell lymphoma extra large (Bcl-xL). In vivo, miR-361-5p significantly reduced tumor growth in a nude mouse xenograft model, and suppressed STAT6 and Bcl-xL expression. In conclusion, the present study indicated that miR-361-5p may represent a novel molecular tool for therapeutic and diagnostic strategies in NSCLC.