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1 Department of Pharmacology and Therapeutics, University of Calgary, Faculty of Medicine, Calgary, T2N 4N1; 3 Departments of Pediatrics and Pharmacology, University of Alberta, Edmonton, Alberta, Canada T6G 2S2; and 2 Department of Medical Physiology, University of Tromso Institute of Medical Biology, N-9037 Tromso, Norway
Although isolated perfused mouse heart models have been developed to study mechanical function, energy substrate metabolism has not been examined despite the expectation that the metabolic rate for a heart from a small mammal should be increased. Consequently, glucose utilization (glycolysis, oxidation) and fatty acid oxidation were measured in isolated working mouse hearts perfused with radiolabeled substrates, 11 mM glucose, and either 0.4 or 1.2 mM palmitate. Heart rate, coronary flow, cardiac output, and cardiac power did not differ significantly between hearts perfused at 0.4 or 1.2 mM palmitate. Although the absolute values obtained for glycolysis and glucose oxidation and fatty acid oxidation are significantly higher than those reported for rat hearts, the pattern of substrate metabolism in mouse hearts is similar to that observed in hearts from larger mammals. The metabolism of mouse hearts can be altered by fatty acid concentration in a manner similar to that observed in larger animals; increasing palmitate concentration altered the balance of substrate metabolism to increase overall energy derived from fatty acids from 64 to 92%.
glycolysis; glucose oxidation; fatty acid oxidation
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