The effect of cyclic AMP analogues and glucagon on cholesteryl ester synthesis and hydrolysis in cultured hamster hepatocytes.
Two cyclic AMP analogues, 8-chloro cyclic AMP and 8-(4 chlorophenylthio) cyclic AMP, were found to increase the incorporation of [3H]oleate into cholesteryl ester in cultured hamster hepatocytes (30-40%), while incorporation into triacylglycerol was unaffected. An increase of a similar magnitude was observed in the presence of glucagon and the phosphodiesterase inhibitor, theophylline. The cyclic AMP analogues also stimulated the activity of neutral cholesteryl ester hydrolase in the cells, and this effect was mimicked by glucagon and theophylline. These results show that cyclic AMP can affect the cholesteryl ester cycle in hamster hepatocytes, and support the idea that the enzymes involved may be co-ordinately regulated.
Hoang
V Q
VQ
Department of Veterinary Basic Sciences, Royal Veterinary College, London, UK.
Suckling
K E
KE
Cho-Chung
Y S
YS
Botham
K M
KM
D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D002478:Cells, Cultured; D002788:Cholesterol Esters / Q000096:biosynthesis*; D006224:Cricetinae; D000242:Cyclic AMP / Q000031:analogs & derivatives* / Q000494:pharmacology; D005934:Glucagon / Q000494:pharmacology*; D006868:Hydrolysis; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008647:Mesocricetus; D019301:Oleic Acid; D009829:Oleic Acids / Q000378:metabolism; D013806:Theophylline / Q000494:pharmacology; D013873:Thionucleotides / Q000494:pharmacology*; D014280:Triglycerides / Q000378:metabolism
D002788:Cholesterol Esters; D009829:Oleic Acids; D013873:Thionucleotides; D014280:Triglycerides; D015124:8-Bromo Cyclic Adenosine Monophosphate; D019301:Oleic Acid; C015929:8-((4-chlorophenyl)thio)cyclic-3',5'-AMP; D005934:Glucagon; C044258:8-chloro-cyclic adenosine monophosphate; D013806:Theophylline; D000242:Cyclic AMP