Abstract
The interaction of the enantiomers of mianserin and propranolol with the binding of [3H]5-hydroxytryptamine ([3H]5-HT) to the 5-HT1A, 5-HT1B and 5-HT1C sites, and with the binding of [3H]ketanserin to the 5-HT2 site, has been evaluated in rat brain membranes. A stereoselective interaction at the 5-HT1A, 5-HT1B and 5-HT1C sites was demonstrated for both compounds, with (+)-mianserin being a more potent displacer than (-)-mianserin and (-)-propranolol being more potent than (+)-propranolol. Only mianserin interacted in a stereoselective manner with the 5-HT2 site, (+)-mianserin being the more potent isomer. The stereoselective association of mianserin and propranolol with the 5-HT1A, 5-HT1B and 5-HT1C sites may prove useful in the characterization of these sites.
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