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Inverse agonist properties of antipsychotic agents at cloned, human (h) serotonin 5-HT1B and h5-HT1D receptors. PDF

Audinot V, Newman-Tancredi A, Cussac D, Millan MJ.
Neuropsychopharmacology. 2001 Sep;25(3):410-22.

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The actions of diverse antipsychotics at cloned h5-HT1B and h5-HT1D receptors were examined employing [3H]GR125,743 and [35S]GTPgammaS for determination of affinities and efficacies, respectively. Compared with hD2 receptors, haloperidol, chlorpromazine and olanzapine showed markedly (>100-fold) lower affinity for h5-HT1D and h5-HT1B receptors at which they expressed inverse agonist properties. Clozapine, risperidone and ocaperidone likewise behaved as inverse agonists at h5-HT1B and h5-HT1D receptors but their affinities were only approximately 10-fold lower than at hD2 receptors. Moreover, ziprasidone, S16924 and ORG5222 interacted at h5-HT1B and h5-HT1D receptors with affinities similar to hD2 sites. While S16924 and ORG5222 were inverse agonists at h5-HT1B and h5-HT1D sites, ziprasidone was an inverse agonist at h5-HT1D receptors yet a partial agonist at h5-HT1B receptors. These actions of antipsychotics were abolished by the selective, neutral antagonist, S18127. In conclusion, with the exception of ziprasidone, all antipsychotics were inverse agonists at h5-HT1B and h5-HT1D receptors, although they differed markedly in their potency at these sites as compared to hD2 receptors.