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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Functional characterization of the novel antipsychotic iloperidone at human D2, D3, alpha 2C, 5-HT6, and 5-HT1A receptors.

Iloperidone has demonstrated an interesting monoamine receptor profile in radioligand binding studies, with nanomolar affinity for certain noradrenaline, dopamine, and serotonin receptors. In this study, the agonist/antagonist activity of iloperidone was determined in cell lines expressing recombinant human D(2A), D(3), alpha(2C), 5-HT(1A), or 5-HT(6) receptors. With the exception of 5-HT(6) receptors, these receptors are negatively coupled to cyclase. Thus, after stimulation with forskolin, the agonists dopamine (at D(2A) and D(3)), noradrenaline (at alpha(2C)), or 8-OH-DPAT (at 5-HT(1A)) induced a reduction in cAMP accumulation. Conversely, activation of the 5-HT(6) receptor by 5-HT led to an increase in cAMP accumulation. Iloperidone alone was devoid of significant agonist activity but inhibited the agonist response in all 5 cell lines in a surmountable and concentration-dependent fashion. Iloperidone was most potent at D(3) receptors (pK(B) 8.59 +/- 0.20; n = 6), followed by alpha(2C) (pK(B) 7.83 +/- 0.06; n = 15), 5-HT(1A) (pK(B) 7.69 +/- 0.18; n = 10), D(2A) (pK(B) 7.53 +/- 0.04; n = 11) and 5-HT(6) (pK(B) 7.11 +/- 0.08; n = 11) receptors.[1]


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