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Updated: Jul 20, 2026
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
Published on: March 6, 2018
Developmental programming: differential effects of prenatal exposure to bisphenol-A or methoxychlor on reproductive
Mozhgan Savabieasfahani1, Kurunthachalam Kannan, Olga Astapova
1Department of Pediatrics, 300 North Ingalls Building, Room 1109 SW, Ann Arbor, University of Michigan 48109-0404, USA.
Endocrinology
|September 2, 2006
Summary
Prenatal exposure to endocrine disruptors like bisphenol A (BPA) and methoxychlor (MXC) can negatively impact reproductive health in ewes, affecting fertility and hormonal regulation.
Area of Science:
- Reproductive Endocrinology
- Environmental Toxicology
- Developmental Biology
Background:
- Reproductive disorders are increasing, with concerns about endocrine-disrupting chemicals (EDCs) impacting fetal development and long-term reproductive health.
- Prenatal testosterone exposure causes adverse effects, suggesting estrogenic EDCs may pose similar risks, particularly concerning fetal exposure.
Purpose of the Study:
- To investigate the long-term effects of prenatal exposure to methoxychlor (MXC) and bisphenol A (BPA) on reproductive cyclicity and endocrine parameters in ewes.
- To determine if fetal exposure to these specific EDCs disrupts normal reproductive development and function.
Main Methods:
- Suffolk ewes were administered MXC, BPA, or a vehicle control from day 30 to 90 of gestation.
- Offspring reproductive parameters, including puberty onset, postnatal hypergonadotropism, and estrous cyclicity, were assessed.
- Hormonal profiles, specifically luteinizing hormone (LH) surges, were characterized after synchronization.
Main Results:
- Prenatal BPA exposure resulted in lower birth weights and postnatal hypergonadotropism in female offspring.
- Methoxychlor (MXC) exposure delayed the onset of the LH surge, while BPA exposure significantly dampened its magnitude.
- No differences in puberty timing were observed, but BPA-exposed ewes had later breeding seasons.
Conclusions:
- Prenatal exposure to BPA and MXC induces long-term, differential effects on reproductive endocrine parameters in ewes.
- These disruptions may have significant implications for fertility and reproductive health.
- The findings highlight the potential risks of fetal exposure to estrogenic EDCs.
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