Arsenic exposure in pregnant mice disrupts placental vasculogenesis and causes spontaneous abortion

Wenjie He, Robert J. Greenwell, Diane M. Brooks, Lilian Calderón-Garcidueñas, Howard D. Beall, J. Douglas Coffin

Research output: Contribution to journalArticlepeer-review

Abstract

Arsenic is an abundant toxicant in ground water and soil around areas with extractive industries. Human epidemiological studies have shown that arsenic exposure is linked to developmental defects and miscarriage. The placenta is known to utilize vasculogenesis to develop its circulation. The hypothesis tested here states the following: arsenic exposure causes placental dysmorphogenesis and defective placental vasculogenesis resulting in placental insufficiency and subsequent spontaneous abortion. To test this hypothesis, pregnant mice were exposed to sodium arsenite (AsIII) through drinking water from conception through weanling stages. Neonatal assessment of birth rates, pup weights, and litter sizes in arsenic exposed and control mothers revealed that AsIII-exposed mothers had only 40% the fecundity of controls. Preterm analysis at E12.5 revealed a loss of fecundity at E12.5 from either 20 ppm or greater exposures to AsIII. There was no loss of fecundity at E7.5 suggesting that spontaneous abortion occurs during placentation. Histomorphometry on E12.5 placentae from arsenic-exposed mice revealed placental dysplasia especially in the vasculature. These results suggest that arsenic toxicity is causative for mammalian spontaneous abortion by virtue of aberrant placental vasculogenesis and placental insufficiency.

Original languageEnglish
Pages (from-to)244-253
Number of pages10
JournalToxicological Sciences
Volume99
Issue number1
DOIs
StatePublished - Sep 2007

Keywords

  • Arsenic
  • Development
  • Mouse
  • Placenta
  • Vasculogenesis

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