Abstract
Bovine adrenal medullary membranes were incubated with [125I]cyanopindolol to assess beta-adrenoceptor binding. Binding was saturable and specific; a single low affinity site (Kd = 750 pM) was identified. [125I]Cyanopindolol binding was displaced by micromolar concentrations of classic beta-adrenoceptor antagonists and by sodium-4-[-2-[2-hydroxy-2-(-3-chloro-phenyl) ethylamino] propyl] phenoxyacetate. These data are similar to reported binding of beta 3-adrenoceptors and may explain beta-adrenoceptor agonist modulation of chromaffin cell degranulation in this catecholamine rich environment.
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