title: Insulin-sensitive adenosine 3',5'-cyclic monophosphate phosphodiesterase of hepatocyte plasma membrane.
abstract: Adenosine 3',5'-cyclic monophosphate phosphodiesterase (EC 3.1.4.17) has been investigated in rat liver as to its insulin sensitivity. Hormone action has been assayed in vitro on a liver homogenate purified by DEAE-cellulose column chromatography, on isolated hepatocytes, on isolated plasma membranes. The DEAE-cellulose chromatography purified homogenate showed no sensitivity to insulin, whereas isolated hepatocytes incubated in presence of insulin showed increased phosphodiesterase activity in a plasma membrane-containing fraction. The plasma membrane-bound enzyme, which shows both high and low affinity components, was significantly stimulated after hormonal treatment; this effect being dependent on a V increase of the low Km form.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000302:isolation & purification / Q000378:metabolism*; D000818:Animals; D002462:Cell Membrane / Q000201:enzymology; D002848:Chromatography, DEAE-Cellulose; D000242:Cyclic AMP / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation; D007328:Insulin / Q000494:pharmacology*; D007700:Kinetics; D008099:Liver / Q000201:enzymology* / Q000648:ultrastructure; D008297:Male; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism*; D011384:Proinsulin / Q000494:pharmacology; D051381:Rats; D014357:Trypsin / Q000378:metabolism
chemical_list: D007328:Insulin; D011384:Proinsulin; D000242:Cyclic AMP; D010727:Phosphoric Diester Hydrolases; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D014357:Trypsin