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Simultaneously reduced gene expression of cortisol-activating and cortisol-inactivating enzymes in placentas of
Ellen Struwe1, Gabriele M Berzl, Ralf L Schild
1Department of Pediatrics, University of Erlangen-Nürnberg, Nürnberg, Germany.
Objective:
The enzyme 11beta-hydroxysteroid dehydrogenase type 2 (11beta-HSD2) converts cortisol into cortisone. Reduced placental activity of 11beta-HSD2 in small-for-gestational-age (SGA) neonates results in fetal cortisol excess. In the present study, we examined the yet unknown gene expression of 11beta-HSD1, which primarily synthesizes cortisol in SGA placenta.
Study Design:
In placentas taken from 24 women with normal-weight newborns and 16 women with SGA neonates, expression of 11beta-HSD1 and 11beta-HSD2 messenger ribonucleic acid (mRNA) was determined using reverse transcription-polymerase chain reaction.
Results:
Placental mRNA expression of 11beta-HSD1 and 11beta-HSD2 was significantly reduced in the SGA group (P = .006 and P < .0001). Both enzymes showed a significant correlation to birthweight SD score and placental weight. Also, levels of both enzymes were significantly correlated.
Conclusion:
In placental tissue of SGA neonates 11beta-HSD2 and 11beta-HSD1 gene expression is reduced. Adapted levels of 11beta-HSD1 might result in a counterregulatory mechanism limiting transplacental passage of elevated cortisol levels.
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