Teratogenicity of 2-ethoxyethanol by dermal application

Area of Science:

• Toxicology
• Developmental Biology
• Reproductive Science

Background:

• 2-ethoxyethanol is a glycol ether with known toxic properties.
• Understanding its effects on pregnancy is crucial for assessing occupational and environmental risks.

Purpose of the Study:

• To evaluate the developmental toxicity of 2-ethoxyethanol in pregnant Sprague-Dawley rats.
• To determine dose-dependent effects on fetal development and maternal health.

Main Methods:

• Pregnant rats were dermally exposed to 2-ethoxyethanol (0.25 or 0.50 ml) or water (control) on gestation days 7-16.
• Maternal weight gain and signs of toxicity were monitored.
• Litters were examined on day 21 for external, skeletal (alizarin red S staining), and visceral (Wilson technique) defects.

Main Results:

• High-dose 2-ethoxyethanol (0.50 ml) resulted in 100% intrauterine death and maternal ataxia.
• Lower-dose 2-ethoxyethanol (0.25 ml) caused significant reductions in fetal body weight and live fetuses per litter.
• Increased incidences of skeletal variations and cardiovascular malformations were observed in the lower-dose group.

Conclusions:

• 2-ethoxyethanol exhibits significant dose-dependent developmental toxicity in rats.
• Exposure during critical gestation periods can lead to severe adverse outcomes, including fetal death and malformations.
• These findings highlight the teratogenic potential of 2-ethoxyethanol and the need for risk mitigation strategies.