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Dexamethasone induces germ cell apoptosis in the human fetal ovary

Marine Poulain1, Nelly Frydman, Clotilde Duquenne

  • 1Laboratoire de Développement des Gonades Batiment 05 Porte A011B Commissariat à l'Energie Atomique-DSV/iRCM/SCSR/LDG Route du Panorama, 92265 Fontenay-aux-Roses, France.

The Journal of Clinical Endocrinology and Metabolism
|July 18, 2012
PubMed
Abstract

Insights

Dexamethasone (DEX) exposure during pregnancy may harm fetal ovarian development. High doses of DEX increased apoptosis and decreased germ cell density in human fetal ovaries, potentially impacting female fertility.

Area of Science:

  • Reproductive biology
  • Endocrinology
  • Developmental biology

Background:

  • Congenital adrenal hyperplasia (CAH) is often caused by 21-hydroxylase deficiency.
  • Synthetic glucocorticoids like dexamethasone (DEX) are used during pregnancy to prevent virilization in female fetuses at risk of CAH.
  • Potential impacts of prenatal DEX exposure on fetal ovarian development require investigation.

Purpose of the Study:

  • To evaluate the effects of DEX on human fetal ovarian development in vitro.
  • To assess DEX-induced changes in germ cell density, proliferation, and apoptosis.

Main Methods:

  • Human fetal ovaries (8-11 weeks post-fertilization) were cultured with varying DEX concentrations (2, 10, 50 μm) for 14 days.
  • Histological analyses were performed to assess germ cell density, proliferation (BrdU incorporation), and apoptosis (cleaved caspase 3).
  • Expression of glucocorticoid receptor (NR3C1) and its target genes (PLZF, FKBP5, KIT) was analyzed.

Main Results:

  • DEX exposure significantly decreased germ cell density at 10 and 50 μm.
  • Apoptotic rates in fetal ovaries increased significantly with DEX exposure.
  • Oogonial proliferation remained unchanged, but the prosurvival gene KIT expression decreased under DEX treatment.
  • Glucocorticoid receptor signaling was confirmed active in the fetal ovary.

Conclusions:

  • In vitro exposure to high-dose DEX impairs human fetal oogenesis by increasing apoptosis.
  • These findings highlight potential risks to female fertility following prenatal DEX exposure.
  • Further epidemiological studies are warranted to investigate the long-term effects on female fertility.

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