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Related Experiment Videos

ROS-dependent caspase-9 activation in hypoxic cell death.

Jee-Youn Kim1, Jae-Hoon Park

  • 1Department of Pathology, College of Medicine, Kyung Hee University, Seoul 130-701, South Korea.

FEBS Letters
|August 14, 2003
PubMed
Summary

Hypoxia activates caspase-9 via reactive oxygen species (ROS) without cytochrome c release. Activated caspase-9 then amplifies cytochrome c release, independent of permeability transition, in hypoxic injury.

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Area of Science:

  • Cellular Biology
  • Mitochondrial Function
  • Apoptosis Signaling

Background:

  • Mitochondria are key in apoptosis, releasing cytochrome c to activate caspase-9.
  • Mechanisms of cytochrome c release and caspase-9 activation during hypoxia remain unclear.

Purpose of the Study:

  • To elucidate the role of reactive oxygen species (ROS) in caspase-9 activation under hypoxic conditions.
  • To investigate the mechanism of cytochrome c release and its relationship with caspase-9 activation during hypoxic injury.

Main Methods:

  • Investigated caspase-9 activation in response to hypoxia.
  • Assessed the role of ROS in hypoxic injury.
  • Examined cytochrome c release and its dependence on permeability transition (PT).

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Main Results:

  • Caspase-9 is activated by ROS during hypoxic injury, independent of initial cytochrome c release.
  • Activated caspase-9 triggers permeability transition (PT)-independent cytochrome c release.
  • This suggests a feedback loop where caspase-9 amplifies its own activation pathway.

Conclusions:

  • Hypoxia-induced caspase-9 activation occurs via ROS, not initial cytochrome c release.
  • Activated caspase-9 can promote further cytochrome c release by disrupting mitochondrial diffusion limits.
  • This highlights a novel ROS-mediated amplification loop in hypoxic apoptosis.