Prenatal epoxiconazole exposure effects on rat postnatal development.

Area of Science:

• Environmental Toxicology
• Developmental Biology
• Reproductive Toxicology

Background:

• Limited knowledge exists regarding the potential toxicity of the fungicide epoxiconazole, despite some studies indicating embryo/fetal toxicity.
• Previous research has raised concerns about epoxiconazole's effects, necessitating further investigation into its developmental impacts.

Purpose of the Study:

• To investigate the effects of maternal exposure to epoxiconazole on the physical development of rat pups.
• To assess how exposure during different gestational periods (early pregnancy vs. organogenesis) influences developmental endpoints.

Main Methods:

• Pregnant rats were exposed to varying doses of epoxiconazole (50.0, 100.0, and 150.0 mg/kg) during specific developmental stages.
• Pups were monitored post-parturition for growth and key maturational milestones, including vaginal opening and testes descent.

Main Results:

• Maternal epoxiconazole exposure, regardless of the exposure phase, led to a significantly earlier mean time to vaginal opening in pups.
• A delayed mean time to testes descent was observed in pups exposed to epoxiconazole in utero.
• No significant effects on the weight gain rate of pups or their mothers were noted within the tested exposure periods.

Conclusions:

• Maternal exposure to epoxiconazole can induce significant alterations in the physical development and maturation of rat pups.
• The observed developmental changes, particularly in vaginal opening and testes descent, align with epoxiconazole's known effects on steroid hormone synthesis.
• These findings highlight the potential reproductive and developmental risks associated with epoxiconazole exposure during pregnancy.