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- W2171789898 abstract "To determine the specificity of the previously demonstrated competition of verapamil with radioligand binding to alpha-adrenergic receptors, we examined the interaction of calcium channel blockers with alpha 1- and alpha 2-adrenergic receptors on several tissues. Verapamil competed for [3H] prazosin binding to alpha 1-adrenergic receptors and for [3H]yohimbine binding to alpha 2-adrenergic receptors in several tissues (human platelets, rat kidney and heart, and cultured muscle cells) with dissociation constants of 0.6-6 microM. The calcium channel blockers D600, D591, fendiline, and prenylamine--which are structural analogues of verapamil--also competed for [3H]yohimbine binding to human platelets. Two other calcium channel blockers, diltiazem and nifedipine, did not compete for [3H] yohimbine binding to human platelets or [3H]prazosin binding to membranes prepared from rat ventricles. We used [3H]nitrendipine binding to identify putative calcium channels on rat myocardial membranes. Nifedipine and verapamil blocked these [3H]nitrendipine-binding sites on ventricular membranes, but epinephrine and prazosin did not, indicating that the ventricular alpha 1 receptors and calcium channels are distinct. We found no specific [3H]nitrendipine binding to human platelets. We conclude that the interaction of verapamil with alpha-adrenergic receptors is not receptor subtype or tissue specific, that interaction with alpha-adrenergic receptors is not a property of all calcium channel blockers, and that the interaction of verapamil with alpha-adrenergic receptors and its interaction with calcium channels occur at at least two distinct sites." @default.
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- W2171789898 date "1983-02-01" @default.
- W2171789898 modified "2023-10-15" @default.
- W2171789898 title "Interaction of verapamil and other calcium channel blockers with alpha 1- and alpha 2-adrenergic receptors." @default.
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- W2171789898 doi "https://doi.org/10.1161/01.res.52.2.226" @default.
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