Molecular modeling of 5-HT3 receptor ligands. |
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Authors: | Suzanne M. Evans Alphonse Galdes Martin Gall |
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Affiliation: | * The BOC Group Technical Center, 100 Mountain Avenue, Murray Hill, NJ 07974, USA † Anaquest, Inc., A Subsidiary of BOC Healthcare, Inc., 100 Mountain Avenue, Murray Hill, NJ 07974, USA |
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Abstract: | Ligands of various chemical classes (e.g., indoles, indazoles, benzamides, carbazoles, and quinolines) have demonstrated high affinity for the 5-HT3 receptor in radiolabeled ligand-binding studies, and have shown 5-HT3 receptor antagonistic activity in functional assays which utilize the excitatory effects of 5-HT on enteric neurons and autonomic afferents. Several 5-HT3 antagonists are currently being evaluated for potential use in the treatment of migraine, schizophrenia, and anxiety, and a few have already demonstrated high efficacy as antiemetics in cancer chemotherapy. The purpose of this presentation is to highlight the significant structure-affinity relationships (SAFIR) and common geometrical features among 5-HT3 receptor ligands, and to describe the three-dimensional pharmacophore for the 5-HT3 recognition site derived from computational techniques. The chemical template containing the recognition elements (functional groups) for the 5-HT3 receptor are: an aromatic or heteroaromatic ring system, a coplanar carbonyl group, and a nitrogen center, interrelated by well-defined distances. Two “binding shapes” or “active shapes” for 5-HT3 ligands have been identified from detailed conformational analyses. |
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Keywords: | Molecular modeling 5-HT3 receptor Serotonin Pharmacophore Structure-activity relationships Three-dimensional Antiemetic |
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