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The effects of systemic administration of fluvoxamine on extracellular serotonin (5-hydroxytryptamine, 5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) concentrations in the frontal cortex and raphe nuclei of freely moving rats were examined. Fluvoxamine significantly increased extracellular 5-HT concentrations in both regions at the two doses used (1 and 10(More)
In microdialysis studies, somatodendritic 5-HT1A receptors in the dorsal raphe nucleus (DRN) were activated by the local infusion of 50 microM citalopram, a selective 5-HT reuptake inhibitor (SSRI). This reduced extracellular 5-HT by about 50% in dorsal striatum, an area receiving 5-HT afferents exclusively from the DRN. (-)Pindolol dose-dependently(More)
The administration of tryptophan (Trp)-free amino acid mixtures to depressed patients responding to serotonin [5-hydroxytryptamine (5-HT)] uptake inhibitors (SSRIs) worsens their clinical state. This procedure reduces Trp availability to brain and thus impairs 5-HT synthesis. We have examined the influence of Trp depletion on extracellular 5-HT and(More)
The relationship between peripheral serotonergic variables, melancholic traits, and clinical improvement after antidepressant treatment was examined in 83 drug-free major depressive patients. Plasma serotonin (5-HT) concentrations was lower in untreated melancholic patients (1.00 +/- 0.11 vs. 1.84 +/- 0.28 ng/mL, p < 0.008; N = 40 and 43, respectively). A(More)
We examined the relationship between the density of serotonergic (5-hydroxytryptamine [5-HT]) uptake sites and extracellular 5-HT concentration in the rat brain using microdialysis with two different models, lesions with 5,7-dihydroxytryptamine (50 microg in the dorsal raphe nucleus (DRN) 15 days before) and sublines of rats genetically selected displaying(More)
The effects of the blockade of serotonin (5-HT) and norepinephrine (NE) transporters on extracellular 5-HT (5-HText) have been examined using in vivo microdialysis in conscious rats. Locally infused, imipramine increased 5-HText dose-dependently in raphe nuclei and frontal cortex. The potency was identical (ED50 11 microM), although greater elevations were(More)
Selective serotonin reuptake inhibitors (SSRIs) reduce the 5-HT release in vivo. This effect is due to the activation of somatodendritic 5-HT1A receptors and it displays a regional pattern comparable to that of selective 5-HT1A agonists, i.e., preferentially in forebrain areas innervated by the dorsal raphe nucleus (DRN). However, despite a comparatively(More)
We have used intracerebral microdialysis to examine the reversibility of the action of brofaromine, a selective inhibitor of monoamine oxidase-A (MAO, E.C. 1.4.3.4.), on 5-hydroxytryptamine (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) output in rat frontal cortex. Brofaromine significantly increased the 5-HT output to about 200% of basal values 4 h after(More)