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Related Experiment Videos

Cytochrome c release from mitochondria proceeds by a two-step process.

Martin Ott1, John D Robertson, Vladimir Gogvadze

  • 1Division of Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Box 210, SE-171 77 Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|January 31, 2002
PubMed
Summary

Cytochrome c release from mitochondria during apoptosis requires two steps: first, disrupting its bond with cardiolipin, then outer membrane permeabilization by Bax. Both steps are crucial for this critical cell death event.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Cytochrome c release from mitochondria is a key event in apoptosis.
  • The exact mechanisms controlling cytochrome c release are not fully understood.

Purpose of the Study:

  • To elucidate the precise molecular mechanisms governing cytochrome c release from mitochondria during apoptosis.

Main Methods:

  • Experiments were conducted using isolated liver mitochondria.
  • Investigated the role of cardiolipin interaction and Bax permeabilization in cytochrome c release.

Main Results:

  • Cytochrome c release is a two-step process involving initial solubilization from cardiolipin and subsequent outer mitochondrial membrane permeabilization by Bax.

Related Experiment Videos

  • Disrupting either the cardiolipin interaction or Bax permeabilization alone does not trigger cytochrome c release.
  • Mitochondrial permeability transition conditions show reduced cytochrome c release if the cardiolipin interaction remains intact.

    • Conclusions:

    • Cytochrome c release requires a sequential two-step mechanism.
    • Compromising either step in the release process inhibits cytochrome c extrusion.