title: Cyclic adenosine and guaosine monophosphates and gucagon: effect on liver membrane potentials.
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.
mesh_terms: D000227:Adenine Nucleotides / Q000494:pharmacology*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002127:Calcium Isotopes; D000242:Cyclic AMP / Q000494:pharmacology / Q000502:physiology; D005934:Glucagon / Q000494:pharmacology* / Q000502:physiology; D006150:Guanine Nucleotides / Q000494:pharmacology*; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D008564:Membrane Potentials / Q000187:drug effects*; D010477:Perfusion; D011188:Potassium / Q000378:metabolism; D051381:Rats; D013268:Stimulation, Chemical; D013748:Tetracaine / Q000494:pharmacology
chemical_list: D000227:Adenine Nucleotides; D002127:Calcium Isotopes; D006150:Guanine Nucleotides; D013748:Tetracaine; D005934:Glucagon; D000242:Cyclic AMP; D007545:Isoproterenol; D011188:Potassium; D002118:Calcium