Expression of 11β-Hydroxysteroid Dehydrogenase Type 1 in Human Fetal Lung and Regulation of Its Expression by Interleukin-1β and Cortisol

Context: Glucocorticoids are crucial in fetal lung function. The amount of cortisol available to its receptors is increased by 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1). Glucocorticoids and IL-1β are known to induce 11β-HSD1 expression in a number of tissues, but controversial results were obtained with regard to 11β-HSD1 expression in human fetal lung. Objective: We examined the expression of 11β-HSD1 and its regulation by cortisol and IL-1β in human fetal lung. Results: Immunohistochemistry revealed 11β-HSD1 expression in the epithelium and mesenchymal layer of the small bronchus and bronchiole of human fetal lung at 8 months but not at 4 months gestation, which was confirmed by PCR revealing 11β-HSD1 mRNA expression in the fetal lung tissue. By using a cell line derived from human fetal lung fibroblasts, we demonstrated that cortisol (10−5 to 10−3 mmol/liter) or IL-1β (0.1 to 10 ng/ml) induced 11β-HSD1 mRNA expression in a concentration-dependent manner. The induction of 11β-HSD1 by IL-1β was ...

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