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Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
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Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

p53-dependent translational control of senescence and transformation via 4E-BPs

Emmanuel Petroulakis1, Armen Parsyan, Ryan J O Dowling

  • 1Department of Biochemistry & Goodman Cancer Center, McGill University, Montreal, Quebec, H3G 1Y6, Canada.

Cancer Cell
|November 3, 2009
PubMed

Insights

The eIF4E-binding proteins (4E-BPs) regulate cell growth and cancer. Their absence promotes tumorigenesis, while their presence, along with p53, induces senescence and blocks cancer development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Biology

Background:

  • eIF4E (eukaryotic initiation factor 4E) is a key translation factor overexpressed in many cancers.
  • 4E-BPs (eIF4E-binding proteins) inhibit eIF4E, acting as tumor suppressors.
  • The interplay between eIF4E, 4E-BPs, and cancer is complex and not fully understood.

Purpose of the Study:

  • To investigate the role of 4E-BPs in tumorigenesis and senescence.
  • To elucidate the mechanism by which 4E-BPs influence cancer development.
  • To determine the impact of p53 status on 4E-BP-mediated cellular processes.

Main Methods:

  • Utilized p53 knockout mice lacking 4E-BP1 and 4E-BP2 to study tumorigenesis.
  • Examined primary fibroblasts lacking 4E-BPs but expressing p53 for senescence and transformation resistance.
  • Investigated the translational control of Gas2 by 4E-BPs as a mechanism for senescence.

Main Results:

  • Mice lacking both p53 and 4E-BPs exhibited increased tumorigenesis.
  • Fibroblasts with p53 but lacking 4E-BPs underwent premature senescence and resisted oncogene-induced transformation.
  • 4E-BPs induce senescence through translational regulation of Gas2, a p53-stabilizing protein.

Conclusions:

  • 4E-BP1 and 4E-BP2 play critical roles in suppressing tumorigenesis and promoting senescence.
  • The p53 tumor suppressor status dictates the outcome of 4E-BP activity in senescence and transformation.
  • A novel p53-mediated senescence pathway involving 4E-BP-dependent translational control of Gas2 was identified.

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