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• W1488892368 endingPage "1133" @default.
• W1488892368 startingPage "1129" @default.
• W1488892368 abstract "Experiments were performed to determine if catecholamines can regulate control points in the gluconeogenic pathway, such as mitochondrial pyruvate carboxylation and pyruvate kinase activity, via an alpha-adrenergic, adenosine 3':5'-monophosphate-independent mechanism. Of a number of alpha agonists tested, only norepinephrine, epinephrine, and phenylephrine caused an increase in mitochondrial pyruvate metabolism. The effects of catecholamines on pyruvate carboxylation were not attenuated by 1-propranolol which abolishes changes in cyclic nucleotide levels but were blocked by alpha antagonists such as ergotamine, phenoxybenzamine, and phentolamine. Time course experiments demonstrated that the effects of catecholamines on the mitochondria and on carbohydrate metabolism correlated temporally with the concentration of epinephrine in the medium but not with the small changes in adenosine 3':5'-monophosphate. The effects of catecholamines appeared to require extracellular Ca2+ ion. The observation that catecholamines do not increase gluconeogenesis to the same extent as glucagon was not due to a differential effect on mitochondrial CO2 fixation. Rather, catecholamines caused a smaller inhibition of pyruvate kinase activity than did glucagon. The effects of catecholamines on pyruvate kinase also appeared to be mediated by an alpha-adrenergic, adenosine 3':5'-monophosphate-independent mechanism." @default.
• W1488892368 created "2016-06-24" @default.
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• W1488892368 date "1979-02-01" @default.
• W1488892368 modified "2023-10-18" @default.
• W1488892368 title "Regulation of mitochondrial pyruvate carboxylation and gluconeogenesis in rat hepatocytes via an alpha-adrenergic, adenosine 3‘:5‘-monophosphate-independent mechanism." @default.
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• W1488892368 doi "https://doi.org/10.1016/s0021-9258(17)34178-9" @default.
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