Abstract
The importance of the glucose/fatty acid cycle in the control of cardiac lipolysis is emphasized by the following observations. Addition of the glycogen debranching inhibitor deoxynojirimycin or an O 2-vehicle, fluorocarbon F-43, to media perfusing paced, lipid-enriched, Langendorff hearts lower cardiac lactate and glycerol 3-phosphate levels together with inhibition of glucagon-stimulated glycerol (and lactate) release. The absence of fluorocarbon during perfusion of 5 Hz paced langendorff hearts probably results in limited tissue oxygenation, resulting in glycogenolysis and lipolysis. The results indicate hormonal control of cardiac lipolysis by glyco(geno)lysis.
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