MicroRNA-194 represses glioma cell epithelial‑to‑mesenchymal transition by targeting Bmi1

Oncol Rep. 2017 Mar;37(3):1593-1600. doi: 10.3892/or.2017.5376. Epub 2017 Jan 17.

Abstract

MicroRNA-194 (miR-194) is frequently dysregulated in many types of cancer. However, the function of miR-194 in glioma remains unknown. In the present study, we aimed to investigate the biological functions of miR-194 in glioma and the potential molecular mechanism of miR-194 involved in glioma progression. We found that miR-194 expression was significantly reduced in glioma specimens and cell lines, as detected by real-time quantitative polymerase chain reaction (RT-qPCR) analysis. The overexpression of miR-194 inhibited while the suppression of miR-194 promoted cell migration, invasion and epithelial mesenchymal transition (EMT) in glioma cells. Bioinformatics analysis showed that the B cell-specific moloney murine leukemia virus insertion site 1 (Bmi1) was a direct target of miR-194, which was validated by dual-luciferase reporter assay, RT-qPCR and western blot analysis. The restoration of Bmi1 expression significantly abrogated the suppressive effect of miR-194 on glioma cell EMT. Taken together, the present study suggests that miR-194 inhibits glioma cell EMT by targeting Bmi1 providing novel insights into understanding the pathogenesis of glioma. The restoration of miR-194 may be a potential therapeutic strategy for glioma treatment.

MeSH terms

  • Apoptosis
  • Blotting, Western
  • Brain Neoplasms / genetics
  • Brain Neoplasms / metabolism
  • Brain Neoplasms / pathology*
  • Cell Adhesion
  • Cell Movement
  • Cell Proliferation
  • Epithelial-Mesenchymal Transition / genetics*
  • Fluorescent Antibody Technique
  • Gene Expression Regulation, Neoplastic*
  • Glioma / genetics
  • Glioma / metabolism
  • Glioma / pathology*
  • Humans
  • MicroRNAs / genetics*
  • Neoplasm Invasiveness
  • Polycomb Repressive Complex 1 / genetics
  • Polycomb Repressive Complex 1 / metabolism*
  • RNA, Messenger / genetics
  • Real-Time Polymerase Chain Reaction
  • Reverse Transcriptase Polymerase Chain Reaction
  • Tumor Cells, Cultured

Substances

  • BMI1 protein, human
  • MIRN194 microRNA, human
  • MicroRNAs
  • RNA, Messenger
  • Polycomb Repressive Complex 1