Physiologically based pharmacokinetic model for developmental exposures to TCDD in the rat

被引:40
作者
Emond, C
Birnbaum, LS
DeVito, MJ
机构
[1] US EPA, Natl Hlth & Environm Effects Res Lab, Div Environm Toxicol, Pharmacokinet Branch, Res Triangle Pk, NC 27711 USA
[2] CNR, Washington, DC 20001 USA
关键词
PBPK; TCDD; rat; dioxin; developmental;
D O I
10.1093/toxsci/kfh117
中图分类号
R99 [毒物学(毒理学)];
学科分类号
100405 ;
摘要
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a potent developmental toxicant in rodents, and these effects occur at exposures similar to background human body burdens. A physiologically based pharmacokinetic (PBPK) model can aid in quantitatively describing the relationship between exposure, dose, and response. The aim of this work was the development a PBPK model to describe the relationship between maternal TCDD exposure and fetal TCDD concentrations during critical windows of susceptibility in the rat. This PBPK model is a modification of an eight-compartment model that describes the adult female rat. The modified model reduces the compartments from eight to four maternal compartments (liver, fat, placenta and rest of the body). Activation of the placental compartment and a separate fetal compartment occurs during gestation. The systemic circulation connects the maternal compartments. The physiological and biochemical parameters were obtained from the literature. The model validation used experimental data from acute and subchronic exposures prior to and during gestation. The simulations predict the TCDD tissue concentrations of the maternal compartments within the standard deviation of the experimental data. The model overestimates the fetal concentrations by approximately a factor of two at low subchronic exposures, but does predict the fetal tissue concentrations within the range of the experimental data at the higher exposures. This model may provide a framework for the development of a human PBPK model to estimate fetal TCDD concentrations in human health risk assessments.
引用
收藏
页码:115 / 133
页数:19
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