Abstract
31P n.m.r. analysis of control and diabetic hearts perfused for 1 h with a glucose buffer showed constant and normal levels of phosphocreatine and ATP. Supplementing the buffer with 0.5, 1.2 or 2.0 mM-palmitic acid had little or no effect on high-energy-phosphate levels in control hearts. In contrast, increases in palmitate concentration produced significant decreases in ATP in diabetic hearts, despite normal and constant levels of phosphocreatine. This 31P n.m.r. study suggests a defect in phosphocreatine metabolism in the perfused diabetic heart that might be related to creatine kinase kinetics.
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