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Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
Published on: June 17, 2015
Embryonic toxicokinetic and dynamic differences underlying strain sensitivity to cadmium during neurulation
Joshua F Robinson1, Xiaozhong Yu, Sungwoo Hong
1Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA.
Reproductive Toxicology (Elmsford, N.Y.)
|December 23, 2009
Summary
Cadmium (Cd) exposure during embryonic development shows different effects in sensitive C57 mice versus resistant SWV mice. Greater Cd uptake in C57 embryos correlates with increased toxic effects, revealing key toxicokinetic and dynamic differences.
Area of Science:
- Developmental toxicology
- Environmental health
- Comparative toxicology
Background:
- Cadmium (Cd) is a toxic heavy metal with known developmental effects.
- Mouse strain differences in sensitivity to Cd-induced developmental toxicity are well-documented.
- Understanding the mechanisms behind differential Cd sensitivity is crucial for risk assessment.
Purpose of the Study:
- To investigate the toxicokinetics and toxicodynamic responses to cadmium (Cd) exposure during embryonic development.
- To identify factors contributing to differential Cd sensitivity between C57 (sensitive) and SWV (resistant) mouse strains.
- To correlate Cd uptake with specific biomarkers of toxicity and metal response.
Main Methods:
- Exposure of pregnant mice to a developmental toxicity-inducing level of Cd during neurulation.
- Assessment of maternal and embryonic Cd uptake.
- Evaluation of biomarkers: metal ion regulators (Mt1, Mt2, DMT1) and cell cycle/apoptosis markers (p53, Cdkn1a, c-Casp3).
Main Results:
- Embryos of the C57 mouse strain exhibited significantly greater Cd uptake compared to SWV embryos.
- Differential Cd uptake was associated with increased alterations in the expression of biomarkers, including c-Casp3.
- Observed differences in Cd uptake and biomarker responses correlated with the known strain-specific sensitivity to Cd.
Conclusions:
- Toxicokinetic differences in Cd uptake between mouse strains contribute to observed variations in embryonic sensitivity.
- Toxicodynamic responses, including alterations in specific biomarkers, are linked to differential Cd sensitivity.
- This study elucidates the underlying mechanisms of Cd embryonic toxicity, highlighting the importance of strain-specific toxicokinetics and dynamics.
