title: In vitro maturation of the rat reticulocyte beta-adrenoceptor adenylate cyclase system.
abstract: Reticulocytes but not mature erythrocytes are equipped with a functional beta-adrenergic system characterizing cells which are under adrenergic control. We have followed the decline of beta-adrenergic functions in a defined, phenylhydrazine-induced population of rat reticulocytes during maturation under cell culture conditions in vitro. beta-Agonist or forskolin-stimulated cyclic 3',5'-AMP (cAMP) formation decreased by 35 +/- 5% within 18 h and by 75 +/- 7% within 5 days. Regulatory control, i.e. the desensitization after chronic agonist exposure was observed at least for the first 18 h of incubation. The protein components of the system (receptors, nucleotide binding protein (N-protein), cyclase) seem to survive longer than 5 days. Our results suggest that an impaired interaction between N-protein and adenylate cyclase may be the initial step in the inactivation of the beta-adrenergic system in reticulocytes.
mesh_terms: D000262:Adenylyl Cyclases / Q000097:blood*; D000818:Animals; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000097:blood; D007545:Isoproterenol / Q000494:pharmacology; D007700:Kinetics; D051381:Rats; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000378:metabolism*; D012156:Reticulocytes / Q000378:metabolism*
chemical_list: D011943:Receptors, Adrenergic, beta; D000242:Cyclic AMP; D000262:Adenylyl Cyclases; D007545:Isoproterenol