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Takahashi, Y. et al.

Takahashi, Kusumi, Ishikane, Matsubara, Koyama,

In vivo occupation of dopamine D1, D2 and serotonin (5-HT)2A receptors by sertindole in the rat brain.

OBJECTIVE: To determine the in vivo occupation of dopamine D1, D2 and serotonin (5-HT)2A receptors by novel antipsychotic agent sertindole using N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline (EEDQ), an irreversible antagonist at these receptor sites. DESIGN: Animal study. INTERVENTIONS: Intraperitoneal administration to Wistar rats of 1 of 4 test compounds: a control compound of 0.15% tartaric acid, or a compound of either sertindole (0.5 mg/kg or 2.0 mg/kg) or clozapine (20 mg/kg) dissolved in 0.15% tartaric acid 1 hour before intraperitoneal administration of EEDQ (8 mg/kg) or ethanol/water solution. RESULTS: Sertindole exhibited little or no effect on D1 and D2 binding sites in vivo. On the other hand, sertindole occupied 5-HT2A receptors more extensively and firmly than EEDQ. This study indicates that sertindole is characterized by high occupancy of 5-HT2A receptors and by low or minimum occupancy of D1 and D2 receptors. CONCLUSIONS: These characteristics are very similar to atypical antipsychotic agents such as clozapine. Sertindole's low liability to cause extrapyramidal side effects (EPS) may be related to greater long-term binding for 5-HT2A receptors relative to D2 receptors.[1]

References

In vivo occupation of dopamine D1, D2 and serotonin (5-HT)2A receptors by sertindole in the rat brain. Takahashi, Y., Kusumi, I., Ishikane, T., Matsubara, S., Koyama, T. Journal of psychiatry & neuroscience : JPN. (1998) [Pubmed]

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