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  • Title: 11beta-hydroxysteroid dehydrogenase type 1: a new regulator of fetal lung maturation.
    Author: Hundertmark S, Dill A, Bühler H, Stevens P, Looman K, Ragosch V, Seckl JR, Lipka C.
    Journal: Horm Metab Res; 2002 Oct; 34(10):537-44. PubMed ID: 12439780.
    Abstract:
    Glucocorticoids (GCs) induce surfactant synthesis in the late fetal lung. Deficient GC action causes respiratory distress syndrome. 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) converts inert cortisone (11-dehydrocorticosterone in rodents) into active cortisol (corticosterone), thus amplifying intracellular GC action. We investigated 11beta-HSD1 in the late fetal lung using the licorice-derived inhibitor, glycyrrhetinic acid (GE), in pregnant rats (day 13 of gestation until term). Control fetal mice and rats showed high 11beta-HSD activity in the late fetal lung; levels of plasma 11-dehydrocorticosterone were also high. Reduction/loss of pulmonary 11beta-HSD1 activity in GE-treated rats substantially impaired fetal lung maturation. Lungs from GE-exposed rats had lower surfactant protein-A (mRNA and protein) levels and reduced amniotic fluid lecithin/sphingomyelin ratios. There was a marked depletion of lung surfactant before and after birth, as detected by both light and electron microscopy. The data emphasize the importance of 11beta-HSD1 in amplifying key GC-dependent maturational processes in the late fetal lung.
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