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Development and Human Extrapolation of Physiologically Based Toxicokinetic Models for Chlorinated Polyfluoroalkyl
Jing Zhang1,2, Huihui Bao2, Wen-Hui Zhao1
1Joint International Research Laboratory of Environment and Health, Ministry of Education, Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
Physiologically based toxicokinetic (PBTK) models for chlorinated polyfluoroalkyl ether sulfonates (F-53B) were developed in rats and extrapolated to humans. These models improve risk assessment for F-53B exposure in the general adult population.
Area of Science:
- Environmental Chemistry
- Toxicology
- Pharmacokinetics
Background:
- Chlorinated polyfluoroalkyl ether sulfonates (F-53B) are alternatives to legacy PFAS, posing environmental persistence and bioaccumulation risks.
- Limited toxicokinetic data for F-53B hampers comprehensive risk assessment.
- F-53B, including 6:2 Cl-PFESA and 8:2 Cl-PFESA, are detected in the environment and humans.
Purpose of the Study:
- Develop physiologically based toxicokinetic (PBTK) models for 6:2 Cl-PFESA and 8:2 Cl-PFESA in rats.
- Extrapolate rat PBTK models to predict human toxicokinetics of F-53B.
- Enhance quantitative risk assessment for F-53B exposure.
Main Methods:
- Administered single oral and intravenous doses of F-53B to male rats.
- Quantified F-53B concentrations in biosamples using ultra-high-performance liquid chromatography-mass spectrometry.
- Developed and validated PBTK models for 6:2 Cl-PFESA and 8:2 Cl-PFESA, extrapolating to humans.
Main Results:
- 6:2 Cl-PFESA predominantly distributed to liver and plasma; 8:2 Cl-PFESA to liver and lung.
- PBTK models accurately predicted F-53B concentrations (100% for 6:2 Cl-PFESA, 92% for 8:2 Cl-PFESA).
- Extrapolated human models were validated using biomonitoring data.
Conclusions:
- Established PBTK models for F-53B (6:2 Cl-PFESA and 8:2 Cl-PFESA) in rats and humans.
- Models provide a robust framework for quantitative risk assessment of F-53B.
- Improved understanding of F-53B toxicokinetics aids in evaluating risks to the general adult population.
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