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  • Title: Cyclic adenosine and guaosine monophosphates and gucagon: effect on liver membrane potentials.
    Author: Friedmann N, Somlyo AV, Somlyo AP.
    Journal: Science; 1971 Jan 29; 171(3969):400-2. PubMed ID: 4321476.
    Abstract:
    Cyclic adenosine monophosphate, cyclic guanosine monophosphate, glucagon, and isoproterenol each hyperpolarized perfused rat liver cells. The hyperpolarization followed a time course similar to the stimulated increase in potassium efflux and was preceded by the increase in calcium efflux. The hyperpolarization induced by cyclic adenosine monophosphate was blocked by tetracaine. The similarity of the action of the cyclic nucleotides to that of glucagon supports the hypothesis that cyclic adenosine monophosphate is the secondary messenger mediating the action of glucagon.
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