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Estimation of placental and lactational transfer and tissue distribution of atrazine and its main metabolites in rodent dams, fetuses, and neonates with physiologically based pharmacokinetic modeling

文献类型： 外文期刊

作者： Lin, Zhoumeng 1 ; Fisher, Jeffrey W. 3 ; Wang, Ran 4 ; Ross, Matthew K. 4 ; Filipov, Nikolay M. 1 ;

作者机构： 1.Univ Georgia, Dept Physiol & Pharmacol, Coll Vet Med, Athens, GA 30602 USA

2.Univ Georgia, Interdisciplinary Toxicol Program, Athens, GA 30602 USA

3.US FDA, Div Biochem Toxicol, Natl Ctr Toxicol Res, Jefferson, AR 72079 USA

4.Mississippi State Univ, Coll Vet Med, Ctr Environm Hlth Sci, Dept Basic Sci, Mississippi State, MS 39762 USA

5.Jiangsu Acad Agr Sci, Inst Food Safety, Nanjing 210014, Peoples R China

关键词： Atrazine;PBPK modeling;Pesticides;Developmental toxicity;Pregnancy;Lactation

期刊名称：TOXICOLOGY AND APPLIED PHARMACOLOGY （ 影响因子：4.219； 五年影响因子：4.302 ）

ISSN： 0041-008X

年卷期： 2013 年 273 卷 1 期

页码：

收录情况： SCI

摘要： Atrazine (ATR) is a widely used chlorotriazine herbicide, a ubiquitous environmental contaminant, and a potential developmental toxicant. To quantitatively evaluate placental/lactational transfer and fetal/neonatal tissue dosimetry of ATR and its major metabolites, physiologically based pharmacokinetic models were developed for rat dams, fetuses and neonates. These models were calibrated using pharmacokinetic data from rat dams repeatedly exposed (oral gavage; 5 mg/kg) to ATR followed by model evaluation against other available rat data. Model simulations corresponded well to the majority of available experimental data and suggest that: (1) the fetus is exposed to both ATR and its major metabolite didealkylatrazine (DACT) at levels similar to maternal plasma levels, (2) the neonate is exposed mostly to DACT at levels two-thirds lower than maternal plasma or fetal levels, while lactational exposure to ATR is minimal, and (3) gestational carryover of DACT greatly affects its neonatal dosimetry up until mid-lactation. To test the model's cross-species extrapolation capability, a pharmacoldnetic study was conducted with pregnant C57BL/6 mice exposed (oral gavage; 5 mg/kg) to ATR from gestational day 12 to 18. By using mouse-specific parameters, the model predictions fitted well with the measured data, including placental ATR/DACT levels. However, fetal concentrations of DACT were overestimated by the model (10-fold). This overestimation suggests that only around 10% of the DACT that reaches the fetus is tissue-bound. These rodent models could be used in fetal/neonatal tissue dosimetry predictions to help design/interpret early life toxicity/ pharmacokinetic studies with ATR and as a foundation for scaling to humans. (C) 2013 Elsevier Inc. All rights reserved.

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