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Related Experiment Videos

Caspases disrupt mitochondrial membrane barrier function

I Marzo1, S A Susin, P X Petit

  • 1Centre National de la Recherche Scientifique, UPR420, Villejuif, France.

FEBS Letters
|June 2, 1998
PubMed
Summary
This summary is machine-generated.

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Caspases, enzymes that trigger cell death, can directly damage mitochondria. This damage releases more caspase activators, creating a self-amplifying loop that speeds up apoptosis.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Mitochondrial outer membrane permeabilization releases cytochrome c, activating caspases.
  • This process is a key event in apoptosis (programmed cell death).

Purpose of the Study:

  • To investigate whether caspases can directly impact mitochondrial membrane integrity.
  • To explore the potential for a feedback loop between caspases and mitochondria.

Main Methods:

  • Incubation of purified mitochondria with recombinant caspases.
  • Assessment of mitochondrial membrane permeability and transmembrane potential.
  • Analysis of intermembrane protein release.

Main Results:

  • Caspases increased mitochondrial membrane permeability.

Related Experiment Videos

  • Caspases dissipated the mitochondrial inner transmembrane potential.
  • Caspases induced the release of intermembrane proteins, including cytochrome c and apoptosis-inducing factor (AIF).

    • Conclusions:

    • Caspases can directly disrupt mitochondrial membrane function.
    • This creates a positive feedback loop, amplifying caspase activation and accelerating apoptosis.
    • This self-amplifying mechanism may coordinate apoptosis across multiple mitochondria.