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Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
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MicroRNA-34a inhibits glioblastoma growth by targeting multiple oncogenes

Yunqing Li1, Fadila Guessous, Ying Zhang

  • 1Departments of Microbiology, Neurology and Pathology, University of Virginia, Charlottesville, VA 22908, USA.

Cancer Research
|September 24, 2009
PubMed

Insights

MicroRNA-34a (miR-34a) suppresses brain tumor growth by targeting c-Met and Notch signaling pathways. Down-regulation of miR-34a correlates with glioblastoma, suggesting its therapeutic potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA-34a (miR-34a) is a p53 target gene with reduced expression in certain cancers.
  • The role of miR-34a in brain tumors, particularly gliomas, requires comprehensive investigation.

Purpose of the Study:

  • To investigate the expression, targets, and functional impact of miR-34a in brain tumor cells and human gliomas.
  • To determine if miR-34a can be a potential therapeutic agent for brain tumors.

Main Methods:

  • Studied miR-34a expression and its effects on target genes (c-Met, Notch-1, Notch-2, CDK6) in glioma and medulloblastoma cell lines.
  • Utilized reporter assays, analyzed human glioma specimens, and performed in vivo xenograft studies.
  • Investigated the reversal of miR-34a effects by forced expression of target genes.

Main Results:

  • miR-34a down-regulated c-Met, Notch-1, Notch-2, and CDK6 protein expression.
  • miR-34a expression inhibited reporter activities for c-Met and Notch signaling.
  • Down-regulated miR-34a levels were observed in glioblastoma tissues and mutant p53 gliomas, inversely correlating with c-Met levels.
  • miR-34a transfection inhibited glioma cell proliferation, survival, and invasion, with no effect on normal astrocytes.
  • In vivo glioblastoma xenograft growth was significantly inhibited by miR-34a expression.

Conclusions:

  • miR-34a acts as a tumor suppressor in gliomas by targeting c-Met and Notch pathways.
  • miR-34a expression is reduced in human gliomas, correlating with tumor progression.
  • miR-34a holds promise as a potential therapeutic agent for brain tumors.

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