Abstract
Objective
The objective of this study was to investigate the role of 11β-hydroxysteroid dehydrogenases (11HSD1 and 11HSD2) in determining the fetal concentration of glucocorticoids.
Methods
The expression patterns for mRNA abundance, protein level, and enzyme activities of placental and fetal 11HSD1 and 11HSD2 were assessed from embryonic day 13 (E13) to day 21 (E21; term E22). The transplacental passage of maternal corticosterone and its contribution to fetal glucocorticoids was also studied.
Results
Placental 11HSD1 mRNA decreased between days E13 and E14 and then remained at much lower values up to E21. Similarly, NADP+-dependent 11β-oxidation and 11-reduction were lower in late gestation. In contrast, placental 11HSD2 mRNA and protein decreased between E13 and E21. Dithiothreitol increased the activity of 11HSD2 and the output of 11-dehydrocorticosterone into fetal circulation. The fetal activity of 11HSD1 increased and 11HSD2 decreased between E16 and E21.
Conclusions
The final third of gestation is accompanied by reciprocal changes in placental and fetal metabolism of corticosterone due to changes in 11HSD1 and 11HSD2 not only at the level of transcription but also at a posttranslational level.
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This study was supported by grants KJB5011402 and AV0Z50110509 from Academy of Sciences and by grant no. 102/2006/C/FaF from the Grant Agency of Charles University.
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Vagnerová, K., Vacková, Z., Klusoňová, P. et al. Reciprocal Changes in Maternal and Fetal Metabolism of Corticosterone in Rat During Gestation. Reprod. Sci. 15, 921–931 (2008). https://doi.org/10.1177/1933719108319161
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DOI: https://doi.org/10.1177/1933719108319161