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[A study on the relation between nitric oxide and abnormal development of embryos]
Wei Sheng Yan Jiu = Journal of Hygiene Research
|May 1, 1997
Summary
Arsenic exposure during early mouse development causes birth defects and embryo death. Increased inducible nitric oxide synthase (iNOS) expression correlates with arsenic levels and developmental toxicity.
Area of Science:
- Developmental toxicology
- Embryology
- Histopathology
Context:
- Arsenic is a known environmental toxicant.
- Early embryonic development is sensitive to toxic insults.
- Yolk-sac placenta (YSP) is crucial for nutrient transfer and development.
Purpose:
- To investigate the effects of arsenic on mouse embryo and YSP.
- To determine the relationship between arsenic exposure and iNOS expression.
- To identify histopathological changes and teratogenic outcomes.
Summary:
- Arsenic exposure showed a dose-response relationship with inducible nitric oxide synthase (iNOS) expression in mouse embryos.
- Histopathological analysis revealed retarded yolk-sac growth, damaged vasculature, and cellular disintegration.
- Increased arsenic levels led to higher teratogenic rates (up to 56.8%) and mortality (up to 24.7%), with observed malformations including open neural tubes and hydropericardium.
Impact:
- Excessive nitric oxide (NO) production is implicated in arsenic-induced embryonic developmental toxicity and teratogenesis.
- iNOS can serve as a valuable biomarker for assessing teratological risks associated with arsenic exposure.