Abstract
The effects of diabetes on myocardial metabolism are complex in that they are tied to the systemic metabolic abnormalities of the disease (hyperglycemia and elevated levels of free fatty acid and ketone bodies), and changes in cardiomyocyte phenotype (e.g., down-regulation of glucose transporters and PDH activity). The cardiac adaptations appear to be driven by the severity of the systemic abnormalities of the disease. The diabetes-induced changes in the plasma milieu and cardiac phenotype both cause impaired glycolysis, pyruvate oxidation, and lactate uptake, and a greater dependency on fatty acids as a source of acetyl CoA. Studies in isolated hearts suggest that therapies aimed at decreasing fatty acid oxidation, or directly stimulating pyruvate oxidation would be of benefit to the diabetic heart during and following myocardial ischemia.
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