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• W2056501910 abstract "The effects of combined treatment with a glucocorticoid receptor (GR) antagonist, Org 34850, and a selective serotonin reuptake inhibitor (SSRI), fluoxetine, were investigated on pre- and postsynaptic aspects of 5-HT neurotransmission. Rats were treated for 14 days with Org 34850 (15 mg per kg per day subcutaneously), fluoxetine (10 mg per kg per day intraperitoneally), or a combination of both drugs. [(3)H]-citalopram binding (an index of 5-HT transporter (5-HTT) expression) was only slightly affected by Org 34850 alone: decreased in cortex and midbrain and increased in hippocampus. In contrast, chronic fluoxetine markedly decreased 5-HTT levels in all regions. Importantly, this decrease was significantly enhanced by combined Org 34850/fluoxetine treatment. There were no changes in the expression of 5-HTT mRNA, suggesting these effects were not due to changes in gene transcription. Expression of tryptophan hydroxylase mRNA and both 5-HT(1A) autoreceptor mRNA and protein (assessed using [(3)H]-8-OH-DPAT binding) were unchanged by any treatment. The expression of postsynaptic 5-HT(1A) receptor protein in the forebrain was unaltered by fluoxetine, Org 34850 or the combined Org 34850/fluoxetine treatment. This downregulation of 5-HTT by fluoxetine and its enhancement by Org 34850 can explain our recent observation that GR antagonists augment the SSRI-induced increase in extracellular 5-HT. In addition, these data suggest that the augmentation of forebrain 5-HT does not result in downregulation of forebrain 5-HT(1A) receptor expression. Given the importance of 5-HT(1A) receptor-mediated transmission in the forebrain to the antidepressant response, these data indicate that co-administration of GR antagonists may be effective in augmenting the antidepressant response to SSRI treatment." @default.
• W2056501910 created "2016-06-24" @default.
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• W2056501910 date "2008-05-21" @default.
• W2056501910 modified "2023-10-14" @default.
• W2056501910 title "Glucocorticoid Receptor Antagonism Augments Fluoxetine-Induced Downregulation of the 5-HT Transporter" @default.
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• W2056501910 doi "https://doi.org/10.1038/npp.2008.70" @default.
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