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Repression of p15INK4b expression by Myc through association with Miz-1

P Staller1, K Peukert, A Kiermaier

  • 1Institute of Molecular Biology and Tumour Research, Emil Mannkopff Strabetae 2, 35033 Marburg, Germany.

Nature Cell Biology
|April 3, 2001
PubMed

Insights

Myc protein (c-Myc) regulates cell proliferation by interacting with Miz-1, a transcription factor that controls the cell cycle inhibitor p15INK4b, impacting cellular senescence and immortalization.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Deregulation of c-Myc drives cell proliferation via transcriptional activation and repression.
  • Myc's role in cell cycle regulation is complex, involving interactions with various transcription factors.

Purpose of the Study:

  • To investigate the role of Myc-associated transcription factor Miz-1 in c-Myc-mediated cell cycle control.
  • To elucidate the mechanism by which Myc and Miz-1 interact to regulate the cyclin-dependent kinase inhibitor p15INK4b.

Main Methods:

  • Analysis of c-Myc and Miz-1 interactions in cell lines and primary mouse embryonic fibroblasts (MEFs).
  • Promoter binding assays to assess Miz-1's interaction with the p15INK4b promoter.
  • Gene expression analysis of p15INK4b mRNA levels under different c-Myc and Miz-1 conditions.

Main Results:

  • Miz-1 induces G1 cell cycle arrest and inhibits cyclin D-associated kinase activity.
  • Miz-1 upregulates p15INK4b expression by binding to its promoter.
  • Myc-Max complex formation with Miz-1 inhibits Miz-1's transcriptional activation of p15INK4b.
  • c-Myc expression in primary cells suppresses p15INK4b accumulation, preventing senescence; conversely, c-Myc deletion activates p15INK4b.
  • c-Myc mutants unable to bind Miz-1 fail to inhibit p15INK4b mRNA and are deficient in immortalization.

Conclusions:

  • Myc-associated transcription factor Miz-1 plays a critical role in cell cycle regulation and senescence.
  • The interaction between Myc and Miz-1 is crucial for controlling p15INK4b expression and cellular immortalization.
  • Understanding this pathway offers insights into c-Myc's oncogenic functions and potential therapeutic targets.

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