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- W582381769 abstract "d-lysergic diethylamide (LSD) is a hallucinogenic drug that interacts with the serotonin (5-HT) system binding to 5-HT1 and 5-HT2 receptors. Little is known about its potential interactions with the dopamine (DA) neurons of the ventral tegmental area (VTA). Using in-vivo electrophysiology in male adult rats, we evaluated the effects of cumulative doses of LSD on VTA DA neuronal activity, compared these effects to those produced on 5-HT neurons in the dorsal raphe nucleus (DRN), and attempted to identify the mechanism of action mediating the effects of LSD on VTA DA neurons. LSD, at low doses (5–20 μg/kg, i.v.) induced a significant decrease of DRN 5-HT firing activity through 5-HT2A and D2 receptors. At these low doses, LSD did not alter VTA DA neuronal activity. On the contrary, at higher doses (30–120 μg/kg, i.v.), LSD dose-dependently decreased VTA DA firing activity. The depletion of 5-HT with p-chlorophenylalanine did not modulate the effects of LSD on DA firing activity. The inhibitory effects of LSD on VTA DA firing activity were prevented by the D2 receptor antagonist haloperidol (50 μg/kg, i.v.) and by the 5-HT1A receptor antagonist WAY-100,635 (500 μg/kg, i.v.). Notably, pretreatment with the trace amine-associate receptor 1 (TAAR1) antagonist EPPTB (5 mg/kg, i.v.) blocked the inhibitory effect of LSD on VTA DA neurons. These results suggest that LSD at high doses strongly affects DA mesolimbic neuronal activity in a 5-HT independent manner and with a pleiotropic mechanism of action involving 5-HT1A, D2 and TAAR1 receptors." @default.
- W582381769 created "2016-06-24" @default.
- W582381769 date "1973-07-01" @default.
- W582381769 modified "2023-09-26" @default.
- W582381769 title "The Biochemistry of functional and experimental psychoses" @default.
- W582381769 doi "https://doi.org/10.1016/0022-3999(73)90030-5" @default.
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