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• W2134171354 abstract "The biodistribution of (-)-4-(3-t-butylamino-2-hydroxypropoxy)-[5,7-3H-benzimidazol-2-one (CGP12177, a non-selective β-adrenoceptor antagonist) and 1-[2-(3-carbamoyl-4-hydroxy)-(5-3H-phenoxy)]-2-propanol methanesuifonate, (CGP26505, a β-tadrenoceptor antagonist) was studied in rats pretreated with various α- and β-adrenoceptor blocking drugs (5 min before 3H injection, in dosages at which the drugs demonstrated the expected selectivity). Cardiac and pulmonary radioactivity were measured after 10 min, when specific binding was maximal. Uptake of [3H]CGP12177 was linked to binding to β-adrenoceptors since it was not affected by prazosin or yohimbine, and was equally well inhibited by propranolol, unlabelled CGP12177 and isoprenaline. Moreover, atenolol and CGP20712A inhibited [3H]CGP12177 uptake in heart (predominantly β1-adrenoceptors) more potently than ICI 118,551, while in lungs (predominantly β2-adrenoceptors) ICI 118,551 was more potent than atenolol or CGP20712A. In contrast, [3HICGP26505 uptake in the target organs was equally effectively inhibited by propranolol and ICI 118,551, and significantly lowered by α-adrenoceptor antagonists. We conclude that [11C]CGP12177, but not [11C]CGP26505 will be suitable for positron emission tomography imaging of β-adrenoceptors in animals." @default.
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• W2134171354 date "1992-11-01" @default.
• W2134171354 modified "2023-10-11" @default.
• W2134171354 title "Uptake of radioligands by rat heart and lung in vivo: CGP 12177 does and CGP 26505 does not reflect binding to β-adrenoceptors" @default.
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• W2134171354 doi "https://doi.org/10.1016/0014-2999(92)90469-k" @default.
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