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- W1975410960 abstract "Stress hormone, glutamatergic system, serotonergic system and the noradrenergic system are involved in depressive disorders. However, the relationship among these is still unclear. The present study examined the effect of dexamethasone (DEX) on the presynaptic glutamate release of synaptosomes from the rat's prelimbic cortex by using biochemical methods combined with pharmacological approaches. The results showed that dexamethasone increased the glutamate release of synaptosomes in a dose-dependent manner. The concentration-response relationship of this effect of DEX was inverse U-shaped with a maximum at 3 μm. Further study showed that glucocorticoid receptor (GR) antagonist and GR siRNA had no effect on the DEX-induced glutamate release but 5-HT₃ receptor antagonist could block the DEX-induced glutamate release which suggested that DEX produced the increased effect on the glutamate release not by GR, but through the activation of the 5-HT₃ receptors which led to the influx of extrasynaptosomal Ca²⁺. Moreover, β₃ adrenergic receptor agonist could block the DEX-induced glutamate release. This result suggested that the effect of DEX on the glutamate release could be regulated by noradrenergic system. The mechanism study showed that β(3) adrenergic receptors regulated the DEX-induced glutamate release via Gs protein-adenylate cyclase (AC)-protein kinase A (PKA) signal transduction pathway." @default.
- W1975410960 created "2016-06-24" @default.
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- W1975410960 date "2012-12-01" @default.
- W1975410960 modified "2023-09-27" @default.
- W1975410960 title "Noradrenergic activity regulated dexamethasone-induced increase of 5-HT3 receptor-mediated glutamate release in the rat's prelimbic cortex" @default.
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- W1975410960 doi "https://doi.org/10.1016/j.bbamcr.2012.08.006" @default.
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