Potent antagonism of 5-HT(3) and 5-HT(6) receptors by olanzapine.
Article Details
- CitationCopy to clipboard
Bymaster FP, Falcone JF, Bauzon D, Kennedy JS, Schenck K, DeLapp NW, Cohen ML
Potent antagonism of 5-HT(3) and 5-HT(6) receptors by olanzapine.
Eur J Pharmacol. 2001 Nov 2;430(2-3):341-9. doi: 10.1016/s0014-2999(01)01399-1.
- PubMed ID
- 11711053 [ View in PubMed]
- Abstract
The interaction of the psychotropic agent olanzapine with serotonin 5-HT(3) and 5-HT(6) receptors was investigated. Olanzapine did not contract the isolated guinea pig ileum, but blocked contractions induced by the 5-HT(3) receptor agonist 2-methyl serotonin (2-CH(3) 5-HT) with a pK(B) value of 6.38+/-0.03, close to the affinity of the 5-HT(3) receptor antagonist ondansetron. The atypical antipsychotic risperidone (1 microM) did not significantly inhibit 2-CH(3) 5-HT-induced contractions. Olanzapine had high affinity (pK(i)=8.30+/-0.06) for human 5-HT(6) receptors in radioligand binding studies. Olanzapine did not stimulate [35S]guanosine-5'-O-(3-thio)triphosphate ([35S]GTPgammaS) binding to the G protein G(s) in cells containing human 5-HT(6) receptors, but inhibited 5-HT-stimulated [35S]GTPgammaS binding (pK(B)=7.38+/-0.16). Among other antipsychotics investigated, clozapine antagonized 5-HT(6) receptors with a pK(B)=7.42+/-0.15, ziprasidone was three-fold less potent, and risperidone, quetiapine and haloperidol were weak antagonists. Thus, olanzapine was not an agonist, but was a potent antagonist at 5-HT(6) receptors and had marked antagonism at 5-HT(3) receptors.
DrugBank Data that Cites this Article
- Drug Targets
Drug Target Kind Organism Pharmacological Action Actions Quetiapine 5-hydroxytryptamine receptor 6 Protein Humans UnknownAntagonistDetails