MiR-19a promotes cell proliferation and invasion by targeting RhoB in human glioma cells.

MicroRNA-19a (miR-19a) is upregulated in different types of cancers, including gliomas, but its specific role and function in gliomas have yet to be fully elucidated. In this study, we found that miR-19a was significantly upregulated in human glioma tissues and cell lines. Overexpression of miR-19a by a miR-19a mimic promoted glioma cell proliferation and invasion. In contrast, miR-19a inhibitor suppressed cell proliferation and invasion. Furthermore, by a dual-luciferase reporter assay and expression analysis, we determined that Ras homolog family member B was a direct target of miR-19a. Knockdown of Ras homolog family member B could block cell proliferation and invasion induced by the miR-19a mimic. In conclusion, our study demonstrated that miR-19a upregulation is common in gliomas and that suppression of miR-19a expression inhibits cell proliferation and invasion, which indicates that miR-19a may act as an oncogene in gliomas.