The potent 5-HT3 receptor antagonist (R)-zacopride labels an additional high affinity site in the central nervous system. |
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Authors: | E Kidd I Bouchelet de Vendegies J C Levy M Hamon H Gozlan |
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Institution: | INSERM U288, Neurobiologie Cellulaire et Fonctionnelle, Faculté de Médecine Pitié-Salpêtrière, Paris, France. |
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Abstract: | The binding characteristics of 3H](R)- and 3H](S)-zacopride were investigated in membranes from the rat entorhinal cortex and NG 108-15 clonal cells. In contrast to 3H](S)-zacopride which bound solely to 5-HT3 receptors, 3H](R)-zacopride recognized another class of binding sites, called the (R)-sites, in both membrane preparations. In addition to (R)-zacopride (Ki = 3-11 nM), only (R)-iodo-zacopride, (R)-dechloro-zacopride, prazosin and mianserin exhibited high to moderate affinity for the (R)-sites, whose possible functions remain to be established. |
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