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Related Experiment Videos

Sphingosine impairs mitochondrial function by opening permeability transition pore.

Sidi Mohamed Hassoun1, Steve Lancel, Patrice Petillot

  • 1EA 2689, CHRU and Université de Lille 2, IFR 114 IMPRT, Lille 59045, France.

Mitochondrion
|May 27, 2006
PubMed
Summary
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Sphingosine impairs heart mitochondria function, leading to contractile dysfunction. This occurs via opening the mitochondrial permeability transition pore, which is partially prevented by Bcl-2.

Area of Science:

  • Cardiovascular Biology
  • Mitochondrial Medicine
  • Biochemistry

Background:

  • Sphingosine is implicated in cardiac contractile dysfunction.
  • The precise mechanisms of sphingosine-induced cardiac mitochondrial dysfunction remain unclear.

Purpose of the Study:

  • To investigate the effects of sphingosine on isolated cardiac mitochondria.
  • To elucidate the role of the mitochondrial permeability transition pore and Bcl-2 in sphingosine's cardiac effects.

Main Methods:

  • Isolated cardiac mitochondria from wild-type and Bcl-2 overexpressing mice were used.
  • Sphingosine's impact on respiration, membrane potential, cytochrome c content, and ATP production was assessed.
  • The effects of cyclosporine A and Bcl-2 overexpression were evaluated.

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Main Results:

  • Sphingosine significantly reduced ADP-coupled respiration, membrane potential, and ATP production.
  • Mitochondrial cytochrome c content was decreased by sphingosine exposure.
  • These detrimental effects were partially mitigated by cyclosporine A and mitochondrial Bcl-2 overexpression.

Conclusions:

  • Sphingosine promotes the opening of the mitochondrial permeability transition pore in cardiac mitochondria.
  • This pore opening leads to uncoupled respiration and contributes to cardiac contractile dysfunction.
  • Targeting the mitochondrial permeability transition pore or enhancing Bcl-2 may offer therapeutic strategies for sphingosine-induced cardiac issues.