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DNA-damaging reagents induce apoptosis through reactive oxygen species-dependent Fas aggregation

Huey-Lan Huang1, Li-Wen Fang, Shu-Ping Lu

  • 1Institute of Molecular Biology, Academia Sinica, Taiwan.

Oncogene
|November 7, 2003
PubMed

Insights

DNA-damaging agents like gamma-irradiation and cisplatin trigger cancer cell death via reactive oxygen species (ROS) and Fas receptor aggregation, revealing a novel link in leukemia apoptosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • DNA-damaging agents can induce cancer cell death through reactive oxygen species (ROS) generation.
  • Cytotoxic agents may also trigger apoptosis via Fas-FADD-caspase-8 pathways.
  • The interplay between ROS and Fas-mediated apoptosis in leukemia remains largely unexplored.

Purpose of the Study:

  • To investigate the potential link between ROS production and Fas-mediated apoptosis in T leukemia Jurkat cells.
  • To elucidate the role of ROS in DNA-damaging agent-induced apoptosis and Fas receptor aggregation.

Main Methods:

  • Jurkat T leukemia cells were treated with gamma-irradiation and cisplatin.
  • Apoptosis induction was assessed, along with Fas aggregation and caspase-8 activation.
  • The effects of ROS scavengers (N-acetyl cysteine, MnTBAP, C60) on apoptosis and Fas clustering were evaluated.

Main Results:

  • Gamma-irradiation and cisplatin induced apoptosis by activating the Fas-FADD-caspase-8 cascade.
  • Caspase-8 or Fas deficiency significantly reduced sensitivity to DNA-damaging agents.
  • ROS scavengers inhibited apoptosis and Fas receptor aggregation induced by cisplatin and gamma-irradiation, but not by Fas activation alone.

Conclusions:

  • DNA-damaging agents promote ROS production, which is critical for Fas receptor aggregation and subsequent apoptosis in leukemia cells.
  • A novel coupling mechanism between ROS and Fas clustering is identified, playing a key role in apoptosis induced by DNA-damaging agents.
  • Targeting the ROS-Fas pathway could offer new therapeutic strategies for leukemia treatment.

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