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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Pro-proliferative FoxM1 is a target of p53-mediated repression

A M Barsotti1, C Prives

  • 1Department of Biological Sciences, Columbia University, New York, NY, USA.

Oncogene
|September 15, 2009
PubMed

Insights

The p53 tumor suppressor protein represses FoxM1, a gene overexpressed in cancers. This p53-mediated repression of FoxM1 is crucial for maintaining G2 arrest after DNA damage, impacting cell fate.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The p53 protein is a key transcription factor regulating cellular stress responses.
  • FoxM1 is a critical G2/M-specific gene regulator, frequently overexpressed in solid tumors.

Purpose of the Study:

  • To investigate the role of p53 in regulating FoxM1 expression.
  • To elucidate the mechanism of p53-mediated FoxM1 repression and its functional significance.

Main Methods:

  • Analysis of FoxM1 mRNA and protein levels following DNA damage in cells with varying p53 expression.
  • Treatment with Nutlin (p53 activator) to assess its effect on FoxM1 levels.
  • Investigation of p53-dependent pathways involving p21 and Rb family proteins.
  • Assessment of cell cycle arrest upon FoxM1 ablation.

Main Results:

  • p53 is required for the downregulation of FoxM1 mRNA and protein after DNA damage.
  • Reduced p53 expression leads to FoxM1 upregulation post-DNA damage.
  • Nutlin treatment suppresses FoxM1 levels.
  • p53-mediated FoxM1 inhibition involves p21 and Rb family proteins, with some p21-independent repression observed.
  • FoxM1 ablation results in G2/M cell cycle arrest.

Conclusions:

  • p53 actively represses FoxM1 expression following DNA damage.
  • This repression is partially dependent on p21 and Rb family proteins.
  • p53-mediated FoxM1 suppression contributes to the maintenance of stable G2 arrest, impacting cancer cell fate.

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