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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

p53- and drug-induced apoptotic responses mediated by BH3-only proteins puma and noxa

Andreas Villunger1, Ewa M Michalak, Leigh Coultas

  • 1Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia. andreas.villunger@uibk.ac.at

Science (New York, N.Y.)
|September 23, 2003
PubMed

Insights

The tumor suppressor p53 initiates apoptosis through genes like Noxa and Puma. Puma deficiency protects cells from DNA damage and other cytotoxic insults, highlighting its critical role in cell death.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA damage-induced apoptosis relies on the p53 tumor suppressor.
  • The specific p53-regulated genes mediating this process are largely unknown.
  • BH3-only proteins, like Noxa and Puma, are key initiators of apoptosis.

Purpose of the Study:

  • To identify critical p53-regulated genes involved in DNA damage-induced apoptosis.
  • To investigate the roles of Noxa and Puma in mediating apoptotic responses.

Main Methods:

  • Analysis of apoptosis in mice with disrupted noxa or puma genes.
  • Assessment of cell death in response to DNA damage and various cytotoxic insults.

Main Results:

  • Disruption of noxa or puma decreased DNA damage-induced apoptosis in fibroblasts.
  • Loss of Puma specifically protected lymphocytes from cell death.
  • Puma deficiency conferred resistance to p53-independent cytotoxic insults, including cytokine deprivation, glucocorticoids, staurosporine, and phorbol ester.

Conclusions:

  • Puma and Noxa are essential mediators of p53-dependent apoptosis.
  • Puma plays a critical role in both p53-dependent and p53-independent apoptotic pathways.
  • These findings elucidate key molecular mechanisms governing programmed cell death.

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