title: The increase of cardiac beta 1-subtype of beta-adrenergic receptors in adult rats following neonatal 6-hydroxydopa treatment.
abstract: An analysis of Hofstee plots of specific [3H]dihydroalprenolol ([3H]DHA) binding in the presence of various concentrations of practolol showed that KD and Bmax in beta 1-subtype adrenoceptors were 19.2-fold lower and 2.76-fold higher than those in beta 2-subtype in adult rat hearts, respectively. Neonatal treatment with 6-hydroxydopa produced a significant increase only in Bmax in beta 1-adrenoceptors without changing Bmax and KD in beta 2-receptors. "Up' regulation in the density of beta 2-type of adrenoceptors seems to be caused by the 6-hydroxydopa-induced sympathetic lesion.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D003201:Computers; D004082:Dihydroalprenolol / Q000378:metabolism; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives* / Q000494:pharmacology; D005260:Female; D006321:Heart / Q000187:drug effects*; D007700:Kinetics; D008297:Male; D009206:Myocardium / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D011941:Receptors, Adrenergic / Q000187:drug effects*; D011943:Receptors, Adrenergic, beta / Q000187:drug effects* / Q000378:metabolism
chemical_list: D011941:Receptors, Adrenergic; D011943:Receptors, Adrenergic, beta; C001388:6-hydroxydopa; D004082:Dihydroalprenolol; D004295:Dihydroxyphenylalanine