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Submitted on March 20, 2006
Accepted on July 26, 2006
School of Biology and the Parker H. Petit Institute for Bioengineering & Bioscience, Georgia Institute of Technology, Atlanta, GA 30332-0230
* To whom correspondence should be addressed. E-mail: marion.sewer{at}biology.gatech.edu.
Steroidogenic factor (SF1, Ad4BP, NR5A1) is a nuclear receptor that is essential for steroid hormone-biosynthesis and endocrine development. Recent crystallographic studies have found that phospholipids are ligands for SF1. In the present study, our aim was to identify endogenous ligands for SF1 and characterize their functional significance in mediating cAMP-dependent transcription of human CYP17. Using tandem mass spectrometry, we show that in H295R adrenocortical cells, SF1 is bound to sphingosine (SPH) and lyso-sphingomyelin (lysoSM) under basal conditions and that cAMP stimulation decreases the amount of SPH and lysoSM bound to the receptor. Silencing both acid and neutral ceramidases using siRNA induces CYP17 mRNA expression, suggesting that SPH acts as an inhibitory ligand. SPH antagonized the ability of cAMP and the coactivator steroid receptor coactivator-1 (SRC-1) to increase CYP17 reporter gene activity. These studies demonstrate that SPH is a bonafide endogenous ligand for SF1 and a negative regulator of CYP17 gene expression.
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