Abstract
The second most common of all structural birth defects, neural tube defects (NTDs), affect approximately 2.6/1,000 births worldwide, and 1/1,000 births in the United States. Of the many environmental agents suspected of being teratogenic, arsenic (As) is capable of inducing NTDs in laboratory animals. We evaluated the teratogenicity of oral exposure on embryonic day (E) 7.5 and E:8.5 to As 4.8, 9.6, or 14.4 mg/kg (as sodium arsenate) in an inbred mouse strain, LM/Bc/Fnn, that does not exhibit spontaneous neural tube malformations. Control and arsenic-treated dams (20 per treatment group) were weighed daily, and evaluated for signs of maternal toxicity. Fetuses were evaluated for soft tissue and skeletal malformations. There was no maternal toxicity as evidenced by losses in maternal body weight following As treatment. However, liver weights were lower in all As-treated groups, suggesting hepatotoxicity due to As exposure. The number of litters affected with an NTD (exencephaly) in each treatment group was: 0, 1, 5, and 9 for control, As 4.8, 9.6, or 14.4, respectively, which exhibited a positive linear trend. There was evidence for trends between As dose and the number of litters displaying vertebral (p<0.001) and calvarial (p<...Continue Reading
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