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Extrapolation from animals to humans: scientific and regulatory aspects
1Medizinisches Institut für Umwelthygiene, Heinrich-Heine-Universität Düsseldorf, Germany.
Toxicology Letters
|December 1, 1992
Summary
Regulatory bodies increasingly recognize the need to protect humans from chemical neurotoxicity. Functional markers are now accepted as early indicators, guiding cross-species extrapolation for chemical safety assessments.
Area of Science:
- Neurotoxicology
- Environmental Health
- Comparative Toxicology
Background:
- Growing recognition of chemical impacts on developing and mature nervous systems.
- Shift from structural to functional markers for early detection of neurotoxicity.
- Regulatory focus on premarket testing for behavior-disrupting chemical properties.
Purpose of the Study:
- To outline principles of cross-species extrapolation in neurotoxicology.
- To highlight the importance of functional endpoints in assessing chemical safety.
- To provide examples of neurotoxic chemicals and their effects across species.
Main Methods:
- Distinguishing between qualitative (endpoint-based) and quantitative (dose-based) extrapolation steps.
- Utilizing broad functional categories (sensory, cognitive, motor, social) for species endpoint comparisons.
- Incorporating toxicokinetic and metabolic data for dose-response translation across species.
Main Results:
- Functional markers are gaining acceptance as early indicators of neurotoxicity.
- Cross-species extrapolation relies on both endpoint similarity and dose-response translation.
- Inorganic lead and polychlorinated biphenyls (PCBs) serve as case studies for comparative neurotoxicology.
Conclusions:
- Effective neurotoxicology requires robust cross-species extrapolation methods.
- Functional neurobehavioral and neurophysiological data are crucial for risk assessment.
- Understanding species-specific toxicokinetics is vital for accurate dose translation.