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Related Experiment Videos

Ceramide forms channels in mitochondrial outer membranes at physiologically relevant concentrations.

Leah J Siskind1, Richard N Kolesnick, Marco Colombini

  • 1Department of Biology, University of Maryland, College Park, MD 20742, USA.

Mitochondrion
|May 23, 2006
PubMed
Summary

Ceramides induce apoptosis by forming channels in mitochondrial membranes. The concentration of ceramides required for channel formation aligns with levels observed during apoptosis, suggesting a key role in releasing proteins.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Ceramides are implicated in inducing apoptosis through direct mitochondrial action.
  • Mitochondria possess enzymes for ceramide metabolism, and elevated levels precede apoptosis.
  • Ceramides can trigger the release of mitochondrial intermembrane space proteins, potentially via channel formation.

Purpose of the Study:

  • To investigate if ceramide concentrations causing protein-permeable channels match those in mitochondria during apoptosis.
  • To determine the role of ceramide-induced channels in the release of pro-apoptotic proteins.

Main Methods:

  • Quantification of ceramide concentration in mitochondrial membranes.
  • Assessing mitochondrial outer membrane permeability in relation to ceramide levels.

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  • Comparing ceramide-induced channel formation in mitochondrial versus erythrocyte plasma membranes.

    • Main Results:

    • A small percentage of ceramide inserts into mitochondrial membranes, directly correlating with outer membrane permeability.
    • Significant ceramide channel formation occurs at concentrations consistent with those found during apoptosis induction (4 pmol/nanomole phospholipid).
    • Ceramide channels specifically form in mitochondrial membranes, not erythrocyte plasma membranes, even at higher concentrations.

    Conclusions:

    • Ceramide channels form in mitochondrial membranes at physiologically relevant concentrations during apoptosis.
    • These ceramide channels are likely responsible for the release of pro-apoptotic proteins from mitochondria.
    • Ceramide channel formation represents a specific mechanism in the mitochondrial pathway of apoptosis.