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- W2128822482 abstract "Sphingolipids are a diverse family of phospholipids and glycolipids that mediate cell-cell interactions, participate in signal transduction pathways and modulate the activity of various cellular proteins and receptors. The objective of the present studies was to characterize the role of the sphingolipid biosynthetic pathway in adrenocorticotropin (ACTH)-dependent steroidogenic gene expression and cortisol production. H295R human adrenocortical cells were treated with ACTH or dibutyryl cAMP (Bt2cAMP) for various time periods and the content of sphingolipids was quantified by mass spectrometry. Treatment of H295R cells with ACTH and Bt2cAMP activated sphingolipid metabolism within five minutes. Decreases were found in the cellular levels of several sphingolipids, including sphingomyelin (SM) and glucosylceramide. ACTH/cAMP rapidly decreased levels of the signaling molecules ceramide, sphingosine and sphingosine-1-phosphate (S1P). The effect of these bioactive sphingolipids on steroidogenic gene expression was also examined. Both sphingosine and S1P were found to increase endogenous CYP17 mRNA and activate the transcriptional activity of CYP17-luciferase reporter constructs. Further, sphingosine and S1P rapidly increase cortisol biosynthesis in H295R cells. In summary, our studies establish a link between ACTH/cAMP-dependent steroidogenesis and sphingolipid metabolism in the human adrenal cortex. Finally, these findings suggest that sphingolipids may serve as signaling mediators in ACTH-stimulated cortisol biosynthesis." @default.
- W2128822482 created "2016-06-24" @default.
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- W2128822482 date "2004-01-01" @default.
- W2128822482 modified "2023-10-02" @default.
- W2128822482 title "ACTH Regulates Steroidogenic Gene Expression and Cortisol Biosynthesis in the Human Adrenal Cortex via Sphingolipid Metabolism" @default.
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- W2128822482 doi "https://doi.org/10.1081/erc-200044040" @default.
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