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• W2127283370 abstract "The melanocortin-4 (MC4) receptor plays a pivotal role in regulating food intake and energy expenditure, and obesity results from mutations that interfere with the MC4 receptor pathway. We investigated the effect of glucocorticoids on endogenous MC4 receptors expressed in GT1-1 cells, an immortalized hypothalamic neuronal cell line. Dexamethasone (Dex) caused a 5- to 10-fold increase in the cAMP response to the MC4 receptor agonist, NDP-alphaMSH. The stimulatory effect of Dex reached a maximum within 24 h and was blocked by the glucocorticoid antagonist RU486. This glucocorticoid effect was specific for the MC4 receptor and not a result of up-regulation of another component of the cAMP cascade, because the response to endogenous beta-adrenergic receptor stimulation was not altered by Dex. Dex also potentiated NDP-alphaMSH-mediated ERK1/2 activation. After 12 h, Dex caused a 3- to 5-fold increase in [125I]NDP-alphaMSH binding, which was maintained for at least 48 h and prevented by RU486. Dex withdrawal caused a rapid return of MC4 receptor concentration to the basal level. Dex-mediated increases in MC4 receptor concentration resulted from a rapid but transient increase in MC4 receptor mRNA. This regulation apparently requires genomic regulatory sequences because Dex did not increase MC4 receptor expression or signaling in CHO cells expressing the MC4 receptor under the control of a cytomegalovirus promoter. We conclude that in GT1-1 hypothalamic neurons, glucocorticoids increase the amplitude of MC4 receptor signaling. This regulation may serve as a control to limit the effects of glucocorticoids on food intake." @default.
• W2127283370 created "2016-06-24" @default.
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• W2127283370 creator A5008490648 @default.
• W2127283370 date "2006-12-01" @default.
• W2127283370 modified "2023-09-25" @default.
• W2127283370 title "Regulation of Endogenous Melanocortin-4 Receptor Expression and Signaling by Glucocorticoids" @default.
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• W2127283370 doi "https://doi.org/10.1210/en.2006-0984" @default.
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• W2127283370 hasPublicationYear "2006" @default.
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