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- W2085108323 abstract "The rate of recovery of rat myocardial alpha 1-adrenoceptor density and responsiveness after in vivo block with phenoxybenzamine (1 mg/kg, i.p.) have been investigated by measuring [3H]prazosin binding, and noradrenaline-stimulated [3H]inositol phosphate production. Repopulation of alpha 1-adrenoceptors was monoexponential, with a t1/2 of 33 h; functional recovery was also monoexponential, with t1/2 of 28 h. Furthermore, our results clearly demonstrate the absence of a receptor reserve for alpha 1-adrenoceptors mediating noradrenaline-stimulated phosphoinositide breakdown in rat myocardial tissue. These observations indicate a close relationship between the density of [3H]prazosin binding sites and the ability of alpha 1-adrenoceptors to respond to noradrenaline. Moreover, based on competition curves for inhibition of specific [3H]prazosin by WB-4101 to rat myocardial membranes 48 h and 7 days after the administration of phenoxybenzamine, the results suggest that rat myocardial membranes contain both alpha 1-adrenoceptors subtypes, i.e., alpha 1A and alpha 1B, in an approximate ratio of 20:80, and this relative ratio does not seem to be altered during the recovery process." @default.
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- W2085108323 title "In vivo recovery of α1-adrenoceptors in rat myocardial tissue after alkylation with phenoxybenzamine" @default.
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- W2085108323 doi "https://doi.org/10.1016/0922-4106(94)90206-2" @default.
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