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Toxicokinetics in the National Toxicology Program
1National Institute of Environmental Health Sciences, National Toxicology Program, Research Triangle Park, NC 27560, USA.
NIDA Research Monograph
|January 1, 1997
Summary
Understanding chemical exposure routes and internal dose is crucial for accurate toxicology studies and risk assessment. Toxicokinetic studies help determine chemical behavior in the body, aiding in interspecies scaling and predicting bioaccumulation.
Area of Science:
- Toxicology
- Pharmacokinetics
- Risk Assessment
Background:
- Chemical toxicity is influenced by exposure route, kinetics, and dose.
- Internal dose knowledge is essential for interpreting toxicology results, interspecies scaling, and risk assessment.
- Monitoring chemical concentrations in blood/tissue reveals bioavailability and kinetic characteristics.
Purpose of the Study:
- To outline the indispensable role of internal dose in toxicology.
- To describe methods for obtaining toxicokinetic data.
- To explain the application of toxicokinetic data in study design and interpretation.
Main Methods:
- Monitoring blood/tissue concentrations of chemicals and metabolites over time.
- Calculating toxicokinetic parameters like area under the curve and clearance.
- Implementing a three-step approach: preliminary, definitive, and integrated toxicokinetic studies.
Main Results:
- Toxicokinetic data define the linear dose range and predict bioaccumulation.
- Changes in kinetic parameters indicate alterations in chemical metabolism (e.g., enzyme induction/inhibition).
- Toxicokinetic evaluations inform the design and interpretation of toxicology studies.
Conclusions:
- Internal dose is critical for accurate toxicology and risk assessment.
- Toxicokinetic studies provide essential data for understanding chemical behavior in vivo.
- A structured approach to toxicokinetic studies enhances their utility in regulatory science.