Increasing evidence has shown that aberrant
microRNAs (
miRNAs) are implicated in
tumorigenesis and
tumor progression by regulating oncogenes or
tumor suppressors. Dysregulation of miR-142 has been reported in multiple
tumors. However, its clinical roles and underlying mechanism in
glioma remain to be elucidated. In the present study, we found that the expression of miR-142 was significantly downregulated in both
glioma tissues and cell lines by qRT-PCR. Clinical analysis revealed that decreased miR-142 was markedly associated with advanced World Health Organization (WHO) grade. Moreover, we disclosed that miR-142 was a novel independent prognostic marker in the prediction of the 5-year survival of
glioma patients. The ectopic overexpression of miR-142 inhibited cell migration, invasion and invasion‑related gene expression. Notably, miR-142 modulated Rac1 by directly binding to its 3'-untranslated (3'-UTR) region, leading to the suppression of the expression of
matrix metalloproteinases (
MMPs). In
glioma clinical samples, miR-142 was inversely correlated with Rac1 expression, and played positive roles in
glioma migration and invasion. Alteration of Rac1 expression at least partially abolished the migration, invasion and
MMP expression of miR-142 in
glioma cells. In the present study, we identified Rac1 as a functional target of miR-142 in
glioma. In conclusion, our data indicated that miR-142 inhibited the migration, invasion and
MMP expression of
glioma by targeting Rac1, and may represent a novel potential therapeutic target and prognostic marker for
glioma.