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DNA damage- and stress-induced apoptosis occurs independently of PIDD

Ira R Kim1, Kiichi Murakami, Nien-Jung Chen

  • 1Department of Medical Biophysics, University of Toronto, ON, Canada.

Apoptosis : an International Journal on Programmed Cell Death
|July 4, 2009
PubMed

Insights

The p53-induced protein with a death domain (PIDD) is not essential for apoptosis. PIDD-deficient mice show normal apoptosis in response to DNA damage, stress, and death receptors, indicating its limited role in cell death pathways.

Area of Science:

  • Cellular and Molecular Biology
  • Apoptosis Research
  • Cancer Biology

Background:

  • The p53-induced protein with a death domain (PIDD) is recognized as a p53 target gene involved in executing apoptosis.
  • Previous research suggested a primary role for PIDD in p53-dependent apoptosis.
  • Understanding PIDD's physiological function in apoptosis is crucial for cancer research and therapeutic development.

Purpose of the Study:

  • To investigate the physiological role of PIDD in apoptosis.
  • To determine if PIDD is essential for DNA damage-, stress-, or death receptor-induced apoptosis.
  • To examine the impact of PIDD deficiency on caspase-2 activation.

Main Methods:

  • Generation of PIDD-deficient mice.
  • Induction of apoptosis via DNA damage, p53-independent stress signals, and death receptor engagement.
  • Assessment of apoptotic responses in wild-type and PIDD-deficient mice.
  • Analysis of caspase-2 processing and activation.

Main Results:

  • PIDD expression is inducible upon DNA damage.
  • PIDD-deficient mice exhibit normal apoptosis in response to DNA damage.
  • Apoptosis occurs normally in PIDD-deficient mice upon exposure to p53-independent stress signals.
  • Normal apoptotic responses and caspase-2 activation are observed in PIDD-deficient mice upon death receptor engagement.
  • PIDD is not required for DNA damage-, stress-, and death receptor-induced apoptosis.

Conclusions:

  • PIDD does not play an essential role in all p53-mediated apoptotic pathways.
  • PIDD is dispensable for p53-independent apoptotic pathways.
  • The study findings indicate that PIDD is not a universally required component for initiating apoptosis through various cellular stress and signaling pathways.

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