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• W2059623974 abstract "Striatal extracellular levels of serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) were monitored with the microdialysis technique during electrical stimulation of the lateral habenula-dorsal raphe (LHb-NRD) pathway in halothane anaesthetized rats. A new double-loop probe, with an improved recovery factor, was implanted into the head of the caudate-putamen and perfused with Ringer solution containing 1 μM of the 5-HT uptake blocker indalpine. Samples were collected every 15 min and analyzed with HPLC coupled to fluorimetric detection. Low frequency stimulation of the LHb (1.5 and 3 Hz, 0.5 mA) produced no detectable changes in striatal indole levels, whereas 15 Hz stimulation induced a 70% increase in 5-HT release. This effect was most likely mediated by a direct LHb-NRD link, since it persisted after ibotenic acid lesions of the interpeduncular nucleus (which is the major projection area for the medial habenular nucleus), but was completely abolished after transection of the fasciculus retroflexus, which carries the axons of the LHb-NRD pathway. The possible identity of the transmitter operating in the LHb-NRD pathway was investigated by NRD injections of kynurenic acid, a potent blocker of excitatory amino acid transmission, and by NRD injections of the GABA antagonist bicuculline. Kynurenic acid (300 nl, 50 mM) did not by itself induce any detectable changes in spontaneous indole output, but completely blocked the effect of LHb stimulation. Injection of bicuculline (300 nl, 2 mM) increased the striatal 5-HT output by about 70%, and potentiated the effect of LHb stimulation by a further 50%. In none of the experiments performed in this study were there any significant changes in striatal 5-HIAA output. These data are compatible with the idea that excitatory amino acids in the LHb-NRD pathway are involved in the regulation of striatal 5-HT release, and that this influence is modulated by GABAergic synaptic activity at the level of the NRD." @default.
• W2059623974 created "2016-06-24" @default.
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• W2059623974 date "1989-07-01" @default.
• W2059623974 modified "2023-10-18" @default.
• W2059623974 title "Regulation of striatal serotonin release by the lateral habenula-dorsal raphe pathway in the rat as demonstrated by in vivo microdialysis: role of excitatory amino acids and GABA" @default.
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• W2059623974 doi "https://doi.org/10.1016/0006-8993(89)90901-3" @default.
• W2059623974 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2473826" @default.
• W2059623974 hasPublicationYear "1989" @default.
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