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- W1999228286 abstract "The effects of local application of the endogenous brain neurotransmitter 5-hydroxytryptamine (5-HT; serotonin) into the dorsal (DR) or median (MR) raphe nuclei on haloperidol-induced catalepsy (CAT) in rats were studied. Local application of 5-HT (40 μg, −10 min) into the DR or MR, respectively, produced a significant reversal of haloperidol-induced CAT. Lower doses (5 or 25 μg) of 5-HT were ineffective. Compared to previous studies using the selective 5-HT1A receptor agonist 8-OH-DPAT, the non-selective endogenous serotonin receptor agonist 5-HT was significantly less potent in this paradigm. Furthermore, the observed anticataleptic effect of 5-HT was seen following injections into both DR or MR nuclei. The reversal of CAT by local application of 5-HT (40 μg) into the DR was significant also at 70 min after 5-HT administration, with the same tendency for 5-HT injections into the MR. At this time interval, other serotonergic behavioral symptoms like head twitches and wet-dog shakes also emerged. The early reversal of CAT by local 5-HT administration into the MR is in all probability mediated via stimulation of 5-HT1A autoreceptors on raphe serotonergic cell bodies. The reversal of CAT following 5-HT injections into the DR might alternatively be mediated via functional mechanisms other than stimulation of 5-HT1A autoreceptors. The anticataleptic effects observed at the later observation time could be due to stimulation of postsynaptic 5-HT2 receptors following diffusion of 5-HT into 5-HT2 receptor rich areas of the brain." @default.
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- W1999228286 date "1999-01-01" @default.
- W1999228286 modified "2023-10-11" @default.
- W1999228286 title "Effects of local application of 5-hydroxytryptamine into the dorsal or median raphe nuclei on haloperidol-induced catalepsy in the rat" @default.
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- W1999228286 doi "https://doi.org/10.1016/s0028-3908(98)00162-2" @default.
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