Tissue-specific messenger ribonucleic acid expression of 11beta-hydroxysteroid dehydrogenase types 1 and 2 and the glucocorticoid receptor within rat placenta suggests exquisite local control of glucocorticoid action

Endocrinology
Brendan J WaddellJ R Seckl

Abstract

Placental 11beta-hydroxysteroid dehydrogenase (11beta-HSD) regulates transplacental passage of maternal glucocorticoids to the fetus and is thus a key determinant of fetal glucocorticoid levels. It has also been proposed that placental 11beta-HSD expression may influence local glucocorticoid actions by regulating access of corticosterone to the glucocorticoid receptor (GR) or mineralocorticoid receptor (MR). Therefore, the present study used a rat model to assess whether the GR or MR are coexpressed with the two forms of 11beta-HSD (types 1 and 2) in the placental labyrinth zone, the major site of maternal-fetal transfer, and in the basal zone, the primary site of placental hormone synthesis. In situ hybridization analysis was used to assess messenger RNA (mRNA) expression for the GR, MR, 11beta-HSD-1, and 11beta-HSD-2 in the two placental zones on days 16, 19 and 22 of pregnancy (term = day 23). Whereas expression of the GR appeared relatively unchanged in both zones at these three stages of pregnancy, that of 11beta-HSD-1 clearly increased in the labyrinth zone but fell in basal zone, whereas the opposite pattern of expression was observed for 11beta-HSD-2. MR expression was not detected at any stage. The pattern of placental...Continue Reading

Citations

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