Samenvatting
Since high expression of farnesoid X receptor (FXR) has been detected in glucocorticoid-producing adrenocortical cells, we evaluated the potential role of FXR in adrenal glucocorticoid production.
FXR agonist GW4064 increased fasting plasma corticosterone levels (+45%; P <0.01) in C57BL/6 mice, indicative of enhanced adrenal steroidogenesis. GW4064 treatment did not affect plasma ACTH levels, adrenal weight, or adrenal expression of steroidogenic genes. Scavenger receptor BI (SR-BI) mRNA and protein expression, respectively, increased 1.9-fold (P <0.01) and 1.5-fold, which suggests a stimulated lipoprotein-associated cholesterol uptake into the adrenals upon GW4064 treatment. In line with an enhanced flux of cellular cholesterol into the steroidogenic pathway, adrenal unesterified and esterified cholesterol stores were 21-41% decreased (P <0.01) upon GW4064 treatment.
In conclusion, we have shown that the FXR agonist GW4064 stimulates plasma corticosterone levels in C57BL/6 mice. Our findings suggest a novel role for FXR in the modulation of adrenal cholesterol metabolism and glucocorticoid synthesis in mice. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
Originele taal-2 | English |
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Pagina's (van-tot) | 69-75 |
Aantal pagina's | 7 |
Tijdschrift | Molecular and Cellular Endocrinology |
Volume | 362 |
Nummer van het tijdschrift | 1-2 |
DOI's | |
Status | Published - 15-okt.-2012 |