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Related Experiment Videos

p53-mediated cell death: relationship to cell cycle control

E Yonish-Rouach1, D Grunwald, S Wilder

  • 1Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.

Molecular and Cellular Biology
|March 1, 1993
PubMed
Summary

Wild-type p53 induces apoptosis in M1 myeloid leukemic cells, but not growth arrest. Interleukin-6 specifically inhibits this p53-mediated cell death, suggesting it arises from conflicting growth signals.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • M1 clone S6 myeloid leukemic cells lack p53 protein expression.
  • Wild-type p53 (wt p53) activation typically induces growth arrest in many cell systems.
  • The role of p53 in cell death versus growth arrest requires further elucidation.

Purpose of the Study:

  • To investigate the effect of wild-type p53 activity on M1 myeloid leukemic cells.
  • To determine if p53-mediated cell death is linked to growth arrest.
  • To examine the influence of interleukin-6 on p53-induced cell death.

Main Methods:

  • Stable transfection of M1 cells with a temperature-sensitive p53 mutant.
  • Induction of wt p53 activity at the permissive temperature.

Related Experiment Videos

  • Cell cycle analysis and viability assays.
  • Treatment with interleukin-6 and serum deprivation.

    • Main Results:

    • Induced wt p53 activity triggered rapid apoptosis in M1 cells, without measurable growth arrest.
    • Cell cycle progression continued during p53-mediated cell death.
    • Cells in the G1 phase were preferentially susceptible to wt p53-induced death.
    • Interleukin-6 specifically inhibited p53-mediated cell death, but not serum deprivation-induced apoptosis.

    Conclusions:

    • p53-mediated cell death in M1 cells is independent of growth arrest.
    • Conflicting growth regulatory signals may drive p53-mediated cell death.
    • Interleukin-6 selectively modulates p53-induced apoptosis, highlighting a specific regulatory pathway.