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Approaches to developing alternative and predictive toxicology based on PBPK/PD and QSAR modeling
R S Yang1, R S Thomas, D L Gustafson
1Center for Environmental Toxicology and Technology, Colorado State University, Fort Collins 80523-1680, USA. ryang@cvmbs.colostate.edu
Environmental Health Perspectives
|December 23, 1998
Summary
Developing predictive toxicology methods is crucial due to the vast number of chemicals. This study integrates physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) and quantitative structure-activity relationship (QSAR) modeling to predict chemical carcinogenicity efficiently.
Area of Science:
- Toxicology
- Environmental Health
- Computational Chemistry
Background:
- Conventional toxicity testing is impractical for the vast number of chemicals and mixtures.
- Developing efficient, predictive toxicology methods is imperative for environmental contamination assessment.
- Carcinogenicity prediction requires novel approaches beyond traditional methods.
Purpose of the Study:
- To develop predictive tools for the toxicologic evaluation of chemicals and chemical mixtures, focusing on carcinogenicity.
- To integrate physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) and quantitative structure-activity relationship (QSAR) modeling with experimental toxicology.
- To reduce animal usage, personnel, resources, and time in carcinogenicity assessments.
Main Methods:
- Integration of PBPK/PD and QSAR modeling with mechanistically based experimental toxicology.
- Quantitative evaluation of molecular and cellular biomarkers critical to carcinogenesis.
- Application of Fourier transform infrared spectroscopy for DNA change analysis and cancer modeling for chlorobenzene isomers.
- Utilizing in vitro (Syrian hamster embryo cell transformation assay, human keratinocytes) and in vivo studies for chemical mixtures.
Main Results:
- Demonstrated approaches for predicting carcinogenicity of chemicals and chemical mixtures.
- Successfully applied integrated PBPK/PD and QSAR modeling with experimental assays for chlorobenzene isomers.
- Ongoing development of similar approaches for complex chemical mixtures using in vitro and in vivo models.
Conclusions:
- Integrated PBPK/PD, QSAR, and experimental toxicology offers a promising pathway for efficient and predictive carcinogenicity assessment.
- These novel methods have the potential to significantly reduce the resources and animal use associated with traditional toxicity testing.
- Further development and validation are necessary to fully realize the potential of these approaches for environmental risk assessment.