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• W2094407119 abstract "Abstract: An in vitro system characterizing the presyn- aptic serotonin (5-HT) autoreceptor which controls the release of 5-HT from rat brain slices is described. Using this system, methiothepin (1–10 μM) demonstrated 5-HT autoreceptor antagonist activity -by enhancing 5-HT release, while several recognized postsynaptic 5-HT receptor antagonists were inactive: mianserin, cinanserin, cyproheptadine, methysergide. The activity of methiothepin was highest in hypothalamic slices and lowest in striatal slices and was inhibited by the autoreceptor agonists lysergic acid diethylamide (LSD) and 5-methoxy- tryptamine (5-MT). The reversal of the methiothepin-enhanced 5-HT release from hypothalamic slices by LSD was not influenced by 0.3 μM tetrodotoxin. The peripheral administration of LSD to rats has been shown to reduce 5-HT synthesis and release by a mechanism thought to involve, in part, an autoreceptor-mediated reduction in impulse flow of 5-HT neurons. In the present experiments, intraperitoneal injection of methiothepin antagonized the LSD-induced reduction in hypothalamic 5-HT synthesis (5-hydroxytryptophan accumulation) while exerting no influence by itself. Conversely, compounds which were not active as 5-HT autoreceptor antagonists in vitro (i.e., cyproheptadine, methysergide, cinanserin) did not influence the effect of LSD on 5-HT synthesis. Further, the reduction in 5-hydroxytryptophan (5-HTP) accumulation by LSD showed regional differences in inhibition by methiothepin (hypothalamus > cortex > striatum) which paralleled the autoreceptor antagonist activity of methiothepin in vitro. These data suggest that similar autoreceptor mechanisms control 5-HT release and synthesis in terminal 5-HT projection areas and that the reduction in 5-HT accumulation by LSD and the antagonism by methiothepin may represent a useful biochemical measure of 5-HT autoreceptor activity in vivo." @default.
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• W2094407119 date "1984-07-01" @default.
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• W2094407119 title "Effects of Methiothepin and Lysergic Acid Diethylamide on Serotonin Release In Vitro and Serotonin Synthesis In Vivo: Possible Relation to Serotonin Autoreceptor Function" @default.
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• W2094407119 doi "https://doi.org/10.1111/j.1471-4159.1984.tb06681.x" @default.
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