Mutant p53 attenuates the SMAD-dependent transforming growth factor beta1 (TGF-beta1) signaling pathway by repressing

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Eyal Kalo1, Yosef Buganim, Keren E Shapira

  • 1Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel.

Molecular and Cellular Biology
|September 19, 2007
PubMed

Insights

Mutant p53 disrupts transforming growth factor beta (TGF-beta) signaling, impairing cell migration and wound healing. This gain-of-function mechanism involves reduced SMAD2/3 activity and TGF-beta receptor type II expression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Transforming growth factor beta (TGF-beta) and p53 are critical regulators of normal cell growth.
  • Mutations in TGF-beta signaling or p53 can lead to malignant transformation.
  • Cross-talk between wild-type p53 and TGF-beta pathways is known.

Purpose of the Study:

  • To investigate the impact of mutant p53 on TGF-beta-induced signaling pathways.
  • To elucidate the molecular mechanisms underlying mutant p53's gain-of-function in relation to TGF-beta signaling.

Main Methods:

  • Assessing cell migration and wound healing in cells expressing mutant p53.
  • Analyzing SMAD2/3 phosphorylation, SMAD2/SMAD4 complex formation, and SMAD4 nuclear translocation.
  • Evaluating TGF-beta-induced transcriptional activity of SMAD2/3 proteins.
  • Measuring TGF-beta receptor type II expression.

Main Results:

  • Cells with mutant p53 exhibited reduced sensitivity to TGF-beta1, with decreased cell migration and impaired wound healing.
  • Mutant p53 attenuated TGF-beta1 signaling, evidenced by reduced SMAD2/3 phosphorylation.
  • Inhibition of SMAD2/SMAD4 complex formation and SMAD4 nuclear translocation was observed.
  • Mutant p53 suppressed TGF-beta1-induced transcriptional activity of SMAD2/3.
  • Mutant p53 expression led to decreased levels of TGF-beta receptor type II.

Conclusions:

  • Mutant p53 interferes with TGF-beta signaling, contributing to its oncogenic gain-of-function.
  • The attenuation of TGF-beta signaling by mutant p53 involves downregulation of TGF-beta receptor type II.
  • These findings offer insights into the molecular basis of mutant p53's role in cancer progression.

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