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MicroRNA-1179 inhibits glioblastoma cell proliferation and cell cycle progression via directly targeting E2F

Xiupeng Xu1, Ning Cai1, Tongle Zhi1

  • 1Department of Neurosurgery, The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210000, Jiangsu, China.

American Journal of Cancer Research
|September 2, 2017
PubMed

Insights

MicroRNA-1179 (miR-1179) is downregulated in glioblastoma multiforme (GBM). Restoring miR-1179 suppresses GBM cell growth and tumor progression by targeting E2F transcription factor 5 (E2F5).

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Glioblastoma multiforme (GBM) is a highly aggressive brain tumor with limited therapeutic options.
  • MicroRNAs (miRNAs) play critical roles in GBM pathogenesis, but the function of miR-1179 remains largely unexplored.
  • Identifying novel therapeutic targets is crucial for improving GBM treatment outcomes.

Purpose of the Study:

  • To investigate the role of miR-1179 in glioblastoma multiforme (GBM) progression.
  • To elucidate the molecular mechanisms underlying miR-1179's function in GBM.
  • To assess the therapeutic potential of miR-1179 in GBM.

Main Methods:

  • Quantitative real-time PCR to measure miR-1179 expression in glioma tissues and cell lines.
  • In vitro functional assays (cell proliferation, cell cycle analysis) following miR-1179 introduction.
  • In vivo studies using a subcutaneous GBM xenograft model to evaluate miR-1179's effect on tumor growth.
  • Luciferase reporter assays and Western blotting to identify and validate E2F transcription factor 5 (E2F5) as a direct target of miR-1179.
  • Rescue experiments involving E2F5 reintroduction into GBM cells.

Main Results:

  • miR-1179 was significantly downregulated in glioma tissues and cell lines compared to normal controls.
  • Overexpression of miR-1179 suppressed GBM cell proliferation, induced cell cycle arrest, and inhibited tumor growth in vivo.
  • E2F transcription factor 5 (E2F5) was identified as a direct target of miR-1179, and its knockdown mimicked miR-1179's effects.
  • Reintroduction of E2F5 reversed the tumor-suppressive effects of miR-1179.
  • A negative correlation was observed between miR-1179 expression and E2F5 mRNA levels in high-grade gliomas.

Conclusions:

  • miR-1179 functions as a tumor suppressor in glioblastoma multiforme (GBM).
  • miR-1179 inhibits GBM progression by directly targeting E2F transcription factor 5 (E2F5), thereby regulating cell cycle progression.
  • miR-1179 represents a potential therapeutic candidate for GBM treatment.
Keywords:
E2F5Glioblastomacell cycle arrestmiR-1179proliferation

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