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- W2079454361 abstract "Pressor responses to intravenous phenylephrine, an adrenoceptor agonist, and to the alpha 2-adrenoceptor-selective agonist guanabenz were examined in conscious rabbits 30 min after treatment with a range of doses of phenoxybenzamine (10(-5) to 5 mg/kg). The maximum number of specific prazosin- and clonidine-binding sites in the spleen of rabbits sacrificed 30 min after receiving phenoxybenzamine were measured using radioligand binding techniques. Treatment with phenoxybenzamine resulted in a dose-dependent reduction in the maximum pressor response to both phenylephrine and guanabenz, although phenoxybenzamine was a more potent antagonist at postsynaptic alpha 1- than at postsynaptic alpha 2-adrenoceptors. Phenoxybenzamine treatment also caused a dose-dependent reduction in specific [3H]prazosin and [3H]clonidine binding. The maximum in vivo pressor response to guanabenz was observed only when all specific clonidine-binding sites were present. There was a close correlation between in vitro receptor number and in vivo pressor responses for alpha 2-adrenoceptor stimulation but not for alpha 1-adrenoceptor-mediated responses. The maximum pressor response to phenylephrine could be obtained in rabbits in which the number of specific prazosin-binding sites was reduced by 60%. These experiments provide an approach to relating in vitro receptor number to in vivo responses." @default.
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- W2079454361 date "1983-09-01" @default.
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- W2079454361 title "Acute Effects of Phenoxybenzamine on α-Adrenoceptor Responses In Vivo and In Vitro" @default.
- W2079454361 doi "https://doi.org/10.1097/00005344-198309000-00025" @default.
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