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p53-mediated cell cycle arrest and apoptosis

Y Lin1, S Benchimol

  • 1Ontario Cancer Institute, Toronto, Canada.

Leukemia
|April 1, 1997
PubMed
Summary

Cytokines like erythropoietin and IL-3 prevent p53-induced apoptosis in cancer cells. These survival factors allow cells to arrest in G1 phase, rather than undergo programmed cell death.

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p53-dependent pathways of apoptosis.

Cell death and differentiation·2001

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The tumor suppressor protein p53 plays a critical role in cell cycle regulation and apoptosis.
  • Mutations in p53 are common in human cancers, leading to uncontrolled cell proliferation.
  • Understanding how p53 function is regulated is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the role of cytokines in modulating p53-dependent apoptosis.
  • To determine if cytokine signaling can uncouple p53-induced G1 arrest from apoptosis.
  • To explore the potential of cytokine-mediated survival pathways in cancer.

Main Methods:

  • Generation of murine erythroleukemia clones expressing a temperature-sensitive mutant p53.
  • Activation of p53 at low temperature (32°C) to induce G1 arrest and apoptosis.
  • Treatment with cytokines (erythropoietin, IL-3, Kit ligand) to assess their effect on p53-induced cell death.
  • Disruption of autocrine IL-3 signaling using cell dilution and neutralizing antibodies.

Main Results:

  • Activation of temperature-sensitive p53 induced G1 arrest and apoptosis in most clones.
  • Cytokines blocked p53-dependent apoptosis, leading to reversible G1 arrest.
  • Some clones exhibited only G1 arrest, with autocrine secretion of erythropoietin or IL-3.
  • Disrupting autocrine IL-3 loops restored p53-induced apoptosis.
  • Cytokines acted as survival factors, uncoupling p53's apoptotic function from its cell cycle arrest function.

Conclusions:

  • Cytokines can act as survival factors, preventing p53-mediated apoptosis.
  • The p53-dependent G1 arrest and apoptotic functions can be dissociated by cytokine signaling.
  • Autocrine cytokine loops may contribute to cancer cell survival by inhibiting p53-induced cell death.

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