Iloperidone binding to human and rat dopamine and 5-HT receptors.

Neuroscience Research, Hoechst Marion Roussel, Inc., Bridgewater, NJ 08807-0800, USA.
Iloperidone (HP 873; 1-[4-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propoxy] -3- methoxyphenyl]ethanone) is a compound currently in clinical trials for the treatment of schizophrenia. Iloperidone displays affinity for dopamine D2 receptors and for 5-HT2A receptors and has a variety of in vivo activities suggestive of an atypical antipsychotic. Here we present an examination of the affinity of iloperidone to a variety of human and rat homologs of dopamine and 5-HT receptor subtypes. We employed receptor binding assays using membranes from cells stably expressing human dopamine D1, D2S, D2L, D3, D4 and D5 and 5-HT2A and 5-HT2C receptors and rat 5-HT6 and 5-HT7 receptors. Iloperidone displayed higher affinity for the dopamine D3 receptor (Ki = 7.1 nM) than for the dopamine D4 receptor (Ki = 25 nM). Iloperidone displayed high affinity for the 5-HT6 and 5-HT7 receptors (Ki = 42.7 and 21.6 nM, respectively), and was found to have higher affinity for the 5-HT2A (Ki = 5.6 nM) than for the 5-HT2C receptor (Ki = 42.8 nM). The potential implications of this receptor binding profile are discussed in comparison with data for other antipsychotic compounds.
Mesh Terms:
Animals, Antipsychotic Agents, Basal Ganglia Diseases, CHO Cells, Cricetinae, Humans, Isoxazoles, Kinetics, Piperidines, Rats, Receptors, Dopamine, Receptors, Dopamine D1, Receptors, Dopamine D2, Receptors, Dopamine D3, Receptors, Dopamine D4, Receptors, Dopamine D5, Receptors, Serotonin
Eur. J. Pharmacol. Dec. 19, 1996; 317(2);417-23 [PUBMED:8997630]
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