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- W2001786765 abstract "Receptor subclasses in iris-ciliary body cell membranes were determined by direct binding of radioactive dihydroalprenolol (DHA), yohimbine (YOH), WB-4101 WB) and prazosin (PRZ), classified respectively as beta 1 + beta 2, alpha 2, alpha 1, and alpha 1 subtype selective ligands (based on binding to brain adrenergic receptors). Specific binding was defined with appropriate unlabelled agonist and antagonist drugs in each case. Binding data were analysed by library programs of the PROPHET computer system. Subclass specificity was also determined indirectly by binding competition of the labelled ligand (at a three- to 10-fold Kd concentration) with increasing concentrations of 'cold' agonist or antagonist. Ligand binding parameters of unlabelled drugs were obtained from Dixon and Scatchard plots of the data. The adrenergic receptor density of iris-ciliary body is approx. 600 fmol mg-1 protein, of which 20-25% are primarily beta 2 receptors. Three distinct subpopulations of alpha-receptors, representing 10, 25 and 40-45% of the total, bind PRZ, WB and YOH, respectively, each with high specificity for its corresponding ligand but with 10- to 1000-fold lower specificity for the other two ligands. The majority of alpha-adrenergic receptors are of the alpha 2-subtype. A small population of receptors are similar to vascular postsynaptic alpha 1-receptors, while a larger subpopulation may have characteristics intermediate between alpha 1- and alpha 2-subtypes." @default.
- W2001786765 created "2016-06-24" @default.
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- W2001786765 date "1985-02-01" @default.
- W2001786765 modified "2023-09-26" @default.
- W2001786765 title "Adrenergic receptor subtypes in rabbit iris-ciliary body membranes: Classification by radioligand studies" @default.
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- W2001786765 doi "https://doi.org/10.1016/0014-4835(85)90009-0" @default.
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