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- W1963980963 abstract "There is evidence to suggest that several different groups of drugs including the so-called coronary vasodilators, benzodiazepines, and calcium channel inhibitors may owe their vasoactivity, in part, to the potentiation of the vasorelaxant effects of endogenous adenosine. To measure the affinity of some of these agents for the membrane-located nucleoside transport system, competition binding assays have been performed using the high-affinity radioligand [3H]nitrobenzylthioinosine (NBMPR). Experiments were performed on human erythrocytes and cardiac membranes from guinea pigs and rats. Recognized nucleoside transport inhibitors had high affinity (less than 50 nM) for NBMPR recognition sites associated with the nucleoside transporter complex in human erythrocytes, whereas calcium channel inhibitors and benzodiazepines had predominantly low affinity (greater than 1 microM). Although some recognized transport inhibitors, such as dipyridamole, show marked differences in affinity for NBMPR sites in guinea pig and rat tissues, benzodiazepines and calcium channel blockers displayed no such species selectivity and had low affinity (greater than 1 microM) for NBMPR sites in both guinea pig and rat cardiac membranes. Consequently, it is unlikely that agents such as benzodiazepines and calcium channel inhibitors cause significant inhibition of adenosine transport, and hence potentiate adenosine actions, at the concentrations required to induce effects through occupation of their respective, specific high-affinity sites." @default.
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- W1963980963 date "1985-10-01" @default.
- W1963980963 modified "2023-10-05" @default.
- W1963980963 title "Affinity of calcium channel inhibitors, benzodiazepines, and other vasoactive compounds for the nucleoside transport system" @default.
- W1963980963 doi "https://doi.org/10.1139/y85-215" @default.
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