cAMP-dependent protein kinase activation mediated by beta 3-adrenergic receptors parallels lipolysis in rat adipocytes.
Catecholamine-induced lipolysis is chiefly mediated through the recently characterized beta 3-adrenergic receptor (AR) in rat adipocytes. Discrepancies between the ability of beta 3-AR agonists to stimulate adenylyl cyclase and the resulting lipolysis were recently reported. cAMP-dependent protein kinase (A-kinase) activation induced by these agonists was compared to lipolysis. Agonist potencies were similar for A-kinase activity ratios and lipolysis. The same A-kinase activity ratio to lipolysis relationship was found for the beta 3-AR agonists tested.
Department of Medical and Physiological Chemistry 4, Lund University, Sweden.
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D
Langin
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Ekholm
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Ridderstråle
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M
Lafontan
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P
Belfrage
D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors / Q000378:metabolism; D000273:Adipose Tissue / Q000378:metabolism*; D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000818:Animals; D000242:Cyclic AMP / Q000494:pharmacology*; D006152:Cyclic GMP / Q000494:pharmacology; D004789:Enzyme Activation; D004983:Ethanolamines / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D008066:Lipolysis / Q000187:drug effects; D008297:Male; D011494:Protein Kinases / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000502:physiology*
D000318:Adrenergic beta-Agonists; D004983:Ethanolamines; D011943:Receptors, Adrenergic, beta; C057368:BRL 37344; D000242:Cyclic AMP; D011494:Protein Kinases; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D006152:Cyclic GMP; D007545:Isoproterenol