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- W2045973879 abstract "Evidence is presented for regulation by insulin of pyruvate dehydrogenase (pdh) interconversion in rat heart muscle in vivo and in vitro. In the alloxan diabetic rat the active (dephospho) enzyme amounted only to 12% of total PDH and was restored to 42% by insulin. Antilipolytic treatment of the dibetic animals was ineffective, indicating that the action of insulin was independent of a lowering of plasma non-esterified fatty acid concentration. On perfusion of isolated hearts from diabetic rats in the presence of glucose the proportion of pyruvate dehydrogenase in the active form remained low but was fully restored upon addition of insulin (2mU/ml) to the medium. No effect of insulin was obtained in the absence of glucose. The correlation between the rate of pyruvate decarboxylation in the perfused heart and of pyruvate dehydrogenase activity, in vitro, suggests that in the diabetic heart the entry of pyruvate into the citric acid cycle is largely controlled by covalent modification of the pyruvate dehydrogenase complex rather than by feedback inhibition. The possible role of insulin therein is discussed." @default.
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- W2045973879 date "1978-02-01" @default.
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- W2045973879 title "The effect of insulin on pyruvate dehydrogenase interconversion in heart muscle of alloxan-diabetic rats" @default.
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- W2045973879 doi "https://doi.org/10.1007/bf01263452" @default.
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