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determined by microarray analysis
University of Edinburgh Centre for Reproductive Biology, The Chancellor’s Building, 49 Little France Crescent, Edinburgh EH16 4SB, UK
1 Scottish Centre for Genomic Technology and Informatics (GTI), The Chancellor’s Building, 49 Little France Crescent, Edinburgh EH16 4SB, UK
2 Pieta Research, PO Box 27069, Edinburgh EH10 5YW, UK
(Requests for offprints should be addressed to M T Rae: mrae1{at}staffmail.ed.ac.uk)
The human ovarian surface epithelium (HOSE) is a common site of gynaecological disease including endometriosis and ovarian cancer, probably due to serial injury-repair events associated with successive ovulations. To comprehend the importance of steroid signalling in the regulation of the HOSE, we used a custom microarray to catalogue the expression of over 250 genes involved in the synthesis and reception of steroid hormones, sterols and retinoids. The array included a subset of non-steroidogenic genes commonly involved in pro-/anti-inflammatory signalling. HOSE cells donated by five patients undergoing surgery for non-malignant gynaecological conditions were cultured for 48 h in the presence and absence of 500 pg/ ml interleukin-1
(IL-1). Total RNA was reverse-transcribed into biotin-labelled cDNA, which was hybridised to the array and visualised by gold-particle resonance light scattering and charge-coupled device (CCD) camera detection. Results for selected genes were verified by quantitative reverse-transcription PCR. In five out of five cases, untreated HOSE cells expressed genes encoding enzymes required for de novo biosynthesis of cholesterol from acetate and subsequent formation of C21-pregnane and C19-androstane steroids. Consistent with the inability of HOSE cells to synthesise glucocorticoids, oestrogens or 5-reduced androgens de novo, CYP21, CYP19 and 5-reductase were not detected. The only steroidogenic gene significantly up-regulated by IL-1 was 11ß-hydroxysteroid dehydrogenase type 1 (11ßHSD1). Other cytokine-induced genes were IL-6, IL-8, nuclear factor 
B (NFB) inhibitor , metallothionein-IIA and lysyl oxidase: inflammation-associated genes that respond to glucocorticoids. The only steroidogenic gene significantly suppressed by IL-1 was 3ßHSD1. Other genes suppressed by IL-1 were aldehyde dehydrogenase (ALDH) 1, ALDH 10, gonadotrophin hormone-releasing hormone receptor, peroxisome proliferation-activated receptor-binding protein (PPAR-bp) and nuclear receptor subfamily 2 group F member 2. These results define a steroidogenic phenotype of cultured HOSE cells and provide a limited expression profile for genes with associated signalling functions. IL-1 co-ordinately induces 11ßHSD1 and a panel of glucocorticoid-regulated, inflammation-associated genes in HOSE cells, providing further evidence that cortisol generated by 11ßHSD1 could participate in the local resolution of inflammation associated with ovulation.
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