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- W2011583570 abstract "5-Hydroxytryptamine (5-HT) showed a biphasic effect on the dissociation rate of [3H]imipramine from human platelet membranes: At low concentrations (EC50, approximately 2.5 microM), 5-HT stimulated the rate, as expected for mutually exclusive binding of 5-HT and imipramine; at higher concentrations (EC50, approximately 40 microM), 5-HT reduced this stimulated rate, a result consistent with 5-HT binding at a site that is physically distinct from both the imipramine binding site and the 5-HT transport recognition site of the 5-HT carrier. This modulatory effect could be mimicked by tryptamine, was saturable and independent of Na+ concentration, and could also be demonstrated for detergent-solubilized carriers. Monophasic association kinetics for [3H]imipramine binding were found. Heat stability experiments showed biphasic thermal inactivation curves. These results are consistent with [3H]imipramine binding to two classes of binding sites at the 5-HT carrier on human platelet membranes, with affinities three- to fivefold different. 5-HT can convert the lower-affinity state into the higher-affinity state." @default.
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- W2011583570 date "1990-04-01" @default.
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- W2011583570 title "Two Affinity States for [<sup>3</sup>H]Imipramine Binding to the Human Platelet 5-Hydroxytryptamine Carrier: An Explanation for the Allosteric Interaction Between 5-Hydroxytryptamine and Imipramine" @default.
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- W2011583570 doi "https://doi.org/10.1111/j.1471-4159.1990.tb01959.x" @default.
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