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- W2113232110 abstract "A dose of dexamethasone was determined in rats (50 micrograms/kg s.c.) that suppressed the corticosterone response to restraint stress by 80%. Corticosteroid receptor occupancy estimates found that the 50 micrograms/kg s.c. dose of dexamethasone had no significant effect on available glucocorticoid receptor (GR) or mineralocorticoid receptor (MR) binding in brain regions (hypothalamus, hippocampus and cortex); on the other hand dexamethasone produced a selective and significant decrease in available GR in peripheral tissues (pituitary and spleen). Functional studies showed that the 50 micrograms/kg s.c. dose of dexamethasone completely blocked the effects of corticotropin-releasing hormone (CRH; 0.3-3.0 micrograms/kg i.p.) on corticosterone secretion, but did not inhibit the corticosterone response to an adrenocorticotropin hormone (ACTH; 2.5 I.U./kg i.p.) challenge. These studies indicate that this dose of dexamethasone exerts its inhibitory effects on the HPA axis primarily by acting at GR in the pituitary. The plasma dexamethasone levels produced by this dose of dexamethasone are similar to those present in humans the afternoon after an oral dexamethasone suppression test (DST), a time at which many depressed patients escape from dexamethasone suppression. These results support and extend other studies which suggest that the DST provides a direct test of the effects of increased GR activation in the pituitary on ACTH and cortisol secretion." @default.
- W2113232110 created "2016-06-24" @default.
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- W2113232110 date "2000-02-01" @default.
- W2113232110 modified "2023-10-12" @default.
- W2113232110 title "Dexamethasone suppression of corticosteroid secretion: evaluation of the site of action by receptor measures and functional studies" @default.
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- W2113232110 doi "https://doi.org/10.1016/s0306-4530(99)00045-1" @default.
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