[Reasons for disorders of fatty acid oxidation in isolated heart mitochondria during ischemia].

The influence of malate and cytochrome c on fatty acid oxidation under control and ischemic conditions was investigated. In the medium without malate, cytochrome did not make fatty acid oxidation decreased during ischemia return to normal. Oxidation in the media containing malate and cytochrome did not differ from control only when it was measured after preliminary oxidation of endogenous substrates. The ratio of palmitoyl-CoA and palmitoyl carnitine to the respiration rates at state 3 was unchanged at 60 min ischemia. Apparently, no changes in carnitine acyltransferase playing a role in oxidation of palmitoyl-CoA took place. Thus, the decrease of fatty acid oxidation at early periods of ischemia is largely caused by a reduction in the content of cytochrome c and intermediates of Krebs cycle in the mitochondria.