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Caspase regulation of genotoxin-induced neural precursor cell death

Cleta D'Sa1, Barbara J Klocke, Francesco Cecconi

  • 1Division of Neuropathology, Department of Pathology, University of Alabama at Birmingham School of Medicine, Birmingham, AL 35294, USA.

Journal of Neuroscience Research
|November 5, 2003
PubMed

Insights

Neural precursor cells (NPCs) undergo apoptosis when exposed to genotoxins. Caspase-9 activation is essential for this process, triggering reactive oxygen species generation and cell death in the developing brain.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Neural precursor cells (NPCs) are crucial for brain development.
  • High frequencies of chromosomal abnormalities and apoptosis in NPCs have been observed.
  • Previous work linked NPC apoptosis to genotoxins via p53 and caspase-9.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying genotoxin-induced apoptosis in NPCs.
  • To determine the roles of specific apoptotic pathway components (Apaf-1, Bax, Bak, caspases) in NPC death.
  • To elucidate the relationship between genotoxin-induced NPC apoptosis and reactive oxygen species (ROS) generation.

Main Methods:

  • Utilized gene-deficient NPCs (Apaf-1, Bax/Bak double knockout) to assess apoptosis resistance.
  • Employed inhibitors of gene transcription, protein translation, and caspase activity.
  • Measured reactive oxygen species (ROS) generation in response to genotoxic agents.
  • Analyzed caspase cleavage (caspase-3, caspase-6) and its role in apoptosis.

Main Results:

  • NPCs deficient in Apaf-1 or both Bax and Bak were resistant to genotoxin-induced apoptosis.
  • Inhibition of transcription, translation, or caspase activity blocked NPC apoptosis.
  • Caspase-9 activation, but not caspase-3 or caspase-6, was critical for genotoxin-induced NPC death.
  • Genotoxin-induced NPC death and ROS generation were significantly reduced by p53, Apaf-1, caspase-9 deficiency, or Bax/Bak deficiency.

Conclusions:

  • Caspase-9 activation is necessary and sufficient for genotoxin-induced NPC apoptosis.
  • The apoptotic pathway in NPCs involves ROS generation, regulated by caspase-9.
  • These findings highlight key regulators of NPC survival during brain development.

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