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In isolated rat hepatocytes: phosphorylase activation by the ionophore A23187 was enhanced in the presence of tumour-promoting phorbol esters and 1,2- (but not 1,3-) diacylglycerols (dioleoyl- and oleoylacetyl-glycerol), with a similar dose-dependency; the activation of phosphorylase by phenylephrine (1 microM) (but not by vasopressin or glucagon) was inhibited both by tumour-promoting phorbol esters and diacylglycerols, but with a different dose-dependency: complete inhibition was achieved with concentrations of phorbol esters two orders of magnitude lower than those of diacylglycerol; binding of the alpha 1-adrenergic antagonist [3H]prazosin and its displacement by unlabelled prazosin was not significantly affected in the presence of the phorbol esters. The possible involvement of protein kinase C in the control of phosphorylase interconversion is discussed.
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