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Estrogen effects on fetal and neonatal testicular development

¹ Univ Paris 7–Denis Diderot, Fontenay-aux-Roses, F-92265 France, ² CEA, DSV/DRR/SEGG/LDRG, Fontenay-aux-Roses, F-92265 France and ³ INSERM, U566, Unit of Gametogenesis and Genotoxicity, Fontenay-aux-Roses, F-92265 France

Correspondence should be addressed to R Habert who is now at Unitè Gamètogenèse et Gènotoxicitè, Univ Paris 7, Denis Diderot, CEA, INSERM U566, CEA/DSV/DRR/SEGG/LDRG, Bat. 5A, RDC, Route du Panorama, 92265 Fontenay-aux-Roses, France; Email: rene.habert{at}cea.fr

In recent years, evidences have accumulated that exposure to environmental components with estrogenic activity causes reproductive disorders in human populations. Studies conducted over the past 50 years have clearly shown a continual decline in semen quality accompanied by an increase in male reproductive disorders during this period in industrial countries. As healthy gametes are a prerequisite for healthy children, such disorders are a significant problem not only for the current society, but also for future generations. These male reproductive disorders have been attributed to xenobiotics, and particularly to xenoestrogens, which have steadily increased in diversity and concentration in the environment and food. Epidemiological, clinical, and experimental studies have suggested that excessive exposure to estrogens and xenoestrogens during fetal and neonatal development may induce testicular developmental disorders, leading to alterations in the adult male fertility. Recently, we have clearly demonstrated that fetal and neonatal testes are very sensitive to estrogens, as the inactivation of estrogen receptor increases steroidogenesis and the inactivation of estrogen receptor ß enhances development of the germ cell lineage in the male.

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