Abstract
Binding studies indicate that both serotonin and dopamine receptors are involved in the mechanism of action of neuroleptic drugs (Leysen et al., 1978), and have distinguished between two 5-HT binding sites, labelled with high affinity either by [3H]-serotonin (5-HT1) or by [3H]-spiperone in the frontal cortex (5-HT2) in various brain tissues (Peroutka and Snyder, 1979). Structural modification of these molecules with neuroleptic properties led to the synthesis of a number of quinazolinedione derivatives. These substances prevented formation of gastric ulcers in rats challenged with compound 48/80 (which induces release of both histamine and serotonin from mast cells); these findings indicated inhibition of serotonin activity, since these rats were protected against histamine-induced effects by treatment with antihistaminic drugs (Awouters et al., 1982). The ability of this group of molecules and of a number of known serotonin antagonists to block serotonin-induced contractions was determined on the isolated caudal artery of the rat (Van Nueten et al., 1981). Their activities correlated significantly with their affinities for 5-HT2 receptors, as measured in radioligand binding studies (Leysen et al., 1982). Of these 5-HT2 receptor antagonists, ketanserin (R 41 468; 3-[2-[4-(p-fluorobenzoyl)-piperidino]ethyl]-2,4(1H,3H)-quinazolinedione) emerged as being the most selective for 5-HT2 receptor sites (Leysen et al., 1981; Van Nueten and Vanhoutte, 1981). It inhibited serotonin-induced contraction of isolated blood vessels (Van Nueten et al., 1981).
Presented by J. M. Van Nueten.
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Nueten, J.M.V., Janssen, P.A.J., Janssens, W.J., Vanhoutte, P.M. (1989). The Development of 5-HT2 Receptor Antagonists. In: Mylecharane, E.J., Angus, J.A., de la Lande, I.S., Humphrey, P.P.A. (eds) Serotonin. Satellite Symposia of the IUPHAR 10th International Congress of Pharmacology. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-10114-6_1
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