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Effect of long-term propranolol administration on specific binding of /sup 3/H-WB-4101 with rat mesenteric vascular membranes

Journal Article · · Bull. Exp. Biol. Med. (Engl. Transl.); (United States)
DOI:https://doi.org/10.1007/BF00839303· OSTI ID:7091478
The aim of this investigation was, first, to study the affinity of certain beta-adrenoblockers for specific binding sites of /sup 3/H-WB-4101 (identifiable as alpha-adrenoreceptors) of brain membranes and, second, to study the characteristics of these same receptors in membranes of mesenteric vessels of rats during long-term administration of propranolol. Isotherms of specific binding, because of the limited quantity of vascular membranes, were determined by the use of three concentrations of /sup 3/H-WB-4101: 0.1, 0.5, and 1.0 nM. It is shown that some beta-adrenoblockers have weak affinity for alpha-adrenoreceptors of brain synaptic membranes exhibited only when these compounds are present in relatively high concentrations. It is also shown that administration of propranolol for 15 days led to a significant decrease in affinity of the alpha-adrenorecptors for their specific antagonist WB-4101.
Research Organization:
Institute of Pharmacology, Acad. of Med. Sci., Moscow
OSTI ID:
7091478
Journal Information:
Bull. Exp. Biol. Med. (Engl. Transl.); (United States), Journal Name: Bull. Exp. Biol. Med. (Engl. Transl.); (United States) Vol. 100:7; ISSN BEXBA
Country of Publication:
United States
Language:
English