title: Characteristics of the beta 1-and beta 2-adrenergic-sensitive adenylate cyclases in glial cell primary cultures and their comparison with beta 2-adrenergic-sensitive adenylate cyclase of meningeal cells.
abstract: The agonist specificity pattern of the beta-adrenergic adenylate cyclase in glial primary cultures was not typical of either beta 1- or beta 2-adrenergic receptors. The dose-response curves for adrenaline did not correspond to simple mass action kinetics and their computer analysis suggests the presence of both beta 1- and beta 2-adrenergic-sensitive adenylate cyclase (58 plus or minus 17% and 42 plus or minus 17% respectively). Similar properties of beta 1- and beta 2-adrenergic-sensitive adenylate cyclases were found by computer analysis of the dose-response curves for isoprenaline in the presence of a constant concentration of practolol (a selective beta 1 antagonist) (55 plus or minus 10% and 45 plus or minus 10% of beta 1- and beta 2-sensitive adenylate cyclase respectively). The curves for displacement of [3H]dihydroalprenolol by practolol confirm these results. For purpose of comparison, the beta-adrenergic receptors of meningeal cells in cultures were subjected to similar analysis. The results clearly showed that these cells exclusively contained beta 2-adrenergic receptors.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D001667:Binding, Competitive; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000201:enzymology; D003201:Computers; D004082:Dihydroalprenolol / Q000378:metabolism; D004837:Epinephrine / Q000494:pharmacology*; D007700:Kinetics; D008578:Meninges / Q000201:enzymology*; D051379:Mice; D009457:Neuroglia / Q000201:enzymology*; D011217:Practolol / Q000494:pharmacology; D011941:Receptors, Adrenergic / Q000378:metabolism*; D011943:Receptors, Adrenergic, beta / Q000378:metabolism*
chemical_list: D011941:Receptors, Adrenergic; D011943:Receptors, Adrenergic, beta; D004082:Dihydroalprenolol; D000262:Adenylyl Cyclases; D011217:Practolol; D004837:Epinephrine