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• W2038534921 abstract "1. Noradrenaline-induced contractions of the rabbit and rat isolated aorta and guinea-pig spleen strips were inhibited by concentrations of phenoxybenzamine which did not affect responses to calcium. This may suggest a specific action on α-adrenoceptors. However, analysis of noradrenaline concentration-effect curves in guinea-pig spleen indicated that 1 μmol/1 phenoxybenzamine should have reduced the available receptor population to 6% of control, but data from radioligand binding experiments on the same tissues using [3H]-prazosin indicated a reduction of the receptor population to only 82% of control. The reduced responsiveness observed in the organ bath study after phenoxybenzamine pretreatment, whilst not apparently related to effects on voltage-dependent calcium channels, could be due to the actions of phenoxybenzamine on other (non-receptor) processes such as receptor-operated calcium channels. 2. Maximal contractile responses to histamine in rabbit isolated aorta but not those in guinea-pig isolated ileal preparations, were depressed by concentrations of phenoxybenzamine which depressed responses to calcium. Phenoxybenzamine produced parallel rightward shifts of curves to carbachol in guinea-pig ileal preparations but only depressed maximal responses to the agonist in higher concentrations which reduced responses to calcium. 3. On the basis of the results obtained with calcium it is possible that the effects of phenoxybenzamine on receptor-mediated responses could be produced through the actions of this antagonist at less specific sites such as voltage-dependent calcium channels for histamine in rabbit aorta and carbachol in guinea-pig ileum. For α-receptor mediated responses in aortic and splenic strip preparations and for histamine-mediated responses in guinea-pig ileum, the actions of phenoxybenzamine may reflect an interaction of the antagonist with receptor-operated calcium channels." @default.
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• W2038534921 date "1985-10-01" @default.
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• W2038534921 title "EFFECTS OF PHENOXYBENZAMINE ON RESPONSES TO SOME RECEPTOR AGONISTS AND CALCIUM IN VITRO" @default.
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• W2038534921 doi "https://doi.org/10.1111/j.1440-1681.1985.tb00895.x" @default.
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