JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Relevance of fatty acid oxidation in regulation of the outer mitochondrial membrane permeability for ADP.

FEBS Letters 2001 December 8
The present study on saponin-treated rat heart muscle fibers has revealed a new function of the fatty acid oxidation system in the regulation of the outer mitochondrial membrane (OMM) permeability for ADP. It is found that oxidation of palmitoyl-CoA+carnitine, palmitoyl-L-carnitine and octanoyl-L-carnitine (alone or in combination with pyruvate+malate) dramatically decreased a very high value of apparent K(m) of oxidative phosphorylation for ADP. Octanoyl-D-carnitine, as well as palmitate, palmitoyl-CoA, and palmitoyl-L-carnitine were not effective in this respect, when their oxidation was prevented by the absence of necessary cofactors or blocked with rotenone. Our data suggest that oxidation, but not transport of fatty acids into mitochondria, induces an increase in the OMM permeability for ADP.

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