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MYC stimulates EZH2 expression by repression of its negative regulator miR-26a

Sandrine Sander1, Lars Bullinger, Kay Klapproth

  • 1Institute of Physiological Chemistry, University of Ulm, Ulm, Germany.

Blood
|August 21, 2008
PubMed

Insights

The MYC oncogene regulates cell growth and microRNA (miRNA) expression. MYC-repressed miR-26a suppresses lymphoma cell proliferation by targeting EZH2, highlighting miRNA

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • The MYC oncogene is a key regulator of cell proliferation and apoptosis, frequently altered in tumors.
  • Emerging evidence suggests MYC influences tumorigenesis through microRNA (miRNA) expression.
  • Understanding MYC-regulated miRNAs is crucial for deciphering cancer development.

Purpose of the Study:

  • To investigate the role of MYC-regulated miRNAs in lymphomagenesis.
  • To identify specific miRNAs targeted by MYC and their functional impact.
  • To explore the therapeutic potential of targeting MYC-miRNA interactions.

Main Methods:

  • Utilized a murine lymphoma model with a Tet-off system to control MYC expression.
  • Performed microarray-based miRNA expression profiling to identify MYC targets.
  • Investigated the function of miR-26a in MYC-dependent cells and its target genes.

Main Results:

  • Identified novel and known MYC-regulated miRNAs, including tumor suppressor miR-26a, which is repressed by MYC.
  • Demonstrated that miR-26a attenuates proliferation in MYC-dependent lymphoma cells.
  • Showed that miR-26a targets the oncogene EZH2, impacting cell cycle progression, and is deregulated in human Burkitt lymphoma.

Conclusions:

  • MYC contributes to lymphomagenesis not only by directly regulating protein-coding genes but also by altering miRNA expression.
  • miR-26a acts as a tumor suppressor by targeting EZH2 and regulating cell cycle.
  • MYC-deregulated miRNAs, like miR-26a, represent potential therapeutic targets in MYC-driven cancers.

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