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Integration of TGF-beta and Ras/MAPK signaling through p53 phosphorylation

Michelangelo Cordenonsi1, Marco Montagner, Maddalena Adorno

  • 1Department of Medical Biotechnologies, Section of Histology and Embryology, University of Padua, Padua, Italy.

Science (New York, N.Y.)
|January 20, 2007
PubMed

Insights

Cell signaling integrates transforming growth factor-beta (TGF-beta) and receptor tyrosine kinase (RTK) pathways. RTK/Ras/MAPK activity links to p53, enabling TGF-beta signaling for cell fate and growth control.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Cells integrate diverse extracellular signals for development and tissue maintenance.
  • The interplay between transforming growth factor-beta (TGF-beta) and receptor tyrosine kinase (RTK) signaling pathways is crucial but not fully understood.
  • Understanding signal integration is key to controlling cellular behavior.

Purpose of the Study:

  • To elucidate the mechanism by which TGF-beta and RTK signaling pathways are integrated.
  • To investigate how this integration controls cell behavior during development and in human cells.

Main Methods:

  • Investigated the combined activity of TGF-beta and RTK signaling.
  • Analyzed the role of RTK/Ras/MAPK pathway in p53 phosphorylation.
  • Examined the interaction between phosphorylated p53 and TGF-beta-activated Smads.

Main Results:

  • RTK/Ras/MAPK pathway activation leads to N-terminal phosphorylation of p53.
  • Phosphorylated p53 interacts with TGF-beta-activated Smad proteins.
  • This interaction mechanism was shown to restrict mesoderm specification in Xenopus embryos.
  • The mechanism also promotes TGF-beta-induced cytostasis in human cells.

Conclusions:

  • A novel mechanism integrating RTK and TGF-beta signaling via p53 phosphorylation has been identified.
  • This integration allows extracellular cues to specify the TGF-beta gene-expression program.
  • The findings have implications for understanding developmental processes and cancer biology.

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