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. 1983 Mar;71(3):476–486. doi: 10.1172/JCI110792

Adrenergic regulation of glycogenolysis in rat liver after cholestasis. Modulation of the balance between alpha 1 and beta 2 receptors.

M Aggerbeck, N Ferry, E S Zafrani, M C Billon, R Barouki, J Hanoune
PMCID: PMC436895  PMID: 6298278

Abstract

The effects of extrahepatic cholestasis upon adrenergic regulation of glycogenolysis and upon the numbers of adrenoceptors in rat liver were studied using isolated hepatocytes and plasma membranes, respectively. A 60% decrease in the number of alpha 1 adrenoceptors (285 vs. 680 fmol/mg protein) and a simultaneous 2.7-fold increase in the number of beta adrenergic sites (67 vs. 25 fmol/mg protein) were observed beginning 36 h after bile flow obstruction and persisted for at least 68 h. The reciprocal modification of the numbers of alpha 1 and beta adrenoceptors was accompanied by a change in the manner of stimulation of glycogen phosphorylase by catecholamines in hepatocytes; originally alpha 1 adrenergic in normal rats (phenylephrine Ka = 0.9 microM, isoproterenol Ka = 7.1 microM), the stimulation became predominantly beta adrenergic in cholestatic animals (phenylephrine Ka = 3.7 microM, isoproterenol Ka = 0.06 microM). In normal rats, activation of the enzyme by epinephrine was inhibited by the alpha blocker phentolamine, without inhibition by the beta blocker propranolol. In contrast, propranolol was more effective than phentolamine in cholestatic rat hepatocytes. Modification of the regulation of glycogenolysis after cholestasis did not seem to be secondary to an alteration in the metabolism of thyroid hormones or in the action of glucocorticoids. However, cholestasis provoked a 10-fold increase in the number of hepatic mitoses and in the incorporation of thymidine into liver DNA of cholestatic animals. Similar changes were observed in regenerating livers, following two-thirds hepatectomy. We propose that the changes following extrahepatic cholestasis might, as well, be explained by a regenerative process.

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Selected References

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