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The road to embryologically based dose-response models
1National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA. kavlock@herl45.herl.epa.gov
Abstract:
The goal of researchers working in the area of developmental toxicology is to prevent adverse reproductive outcomes (early pregnancy loss, birth defects, reduced birth weight, and altered functional development) in humans due to exposures to environmental contaminants, therapeutic drugs, and other factors. To best achieve that goal, it is important that relevant information be gathered and assimilated in the risk assessment process. One of the major challenges of improved risk assessment is to better use all pertinent biological and mechanistic information. This may be done qualitatively (e.g., demonstrating that the experimental model is not appropriate for extrapolation purposes); semiquantitatively (using information to reduce the degree of uncertainty present under default extrapolation procedures), or quantitatively (formally describing the relationships between exposure and adverse outcome in mathematical forms, including components that directly reflect individual steps in the overall progression of toxicity). In this paper we review the recent advances in the risk assessment process for developmental toxicants and hypothesize on future directions that may revolutionize our thinking in this area. The road to these changes sometimes appears to be a well-mapped course on a relatively smooth surface; at other times the path is bumpy and obscure, while at still other times it is only a wish in the eye of the engineer to cross an uncharted and rugged environment.
Insights
Developmental toxicology research aims to prevent adverse reproductive outcomes from environmental exposures. Advances in risk assessment better utilize biological data for improved prediction of developmental toxicants.
Area of Science:
- Developmental toxicology
- Reproductive toxicology
- Environmental health sciences
Background:
- Preventing adverse reproductive outcomes (e.g., birth defects, low birth weight) is a key goal in developmental toxicology.
- Risk assessment for developmental toxicants requires integrating diverse biological and mechanistic information.
- Current challenges include effectively utilizing all pertinent data within the risk assessment framework.
Purpose of the Study:
- To review recent advancements in the risk assessment process for developmental toxicants.
- To explore future directions that could revolutionize developmental toxicology risk assessment.
- To highlight the importance of incorporating biological and mechanistic data into risk assessment.
Main Methods:
- Qualitative assessment of experimental model appropriateness for extrapolation.
- Semiquantitative approaches to reduce uncertainty in extrapolation procedures.
- Quantitative methods, including mathematical modeling of exposure-response relationships and toxicity pathways.
Main Results:
- Recent advances facilitate better integration of biological and mechanistic data into risk assessment.
- Progress has been made in qualitative, semiquantitative, and quantitative methods for risk assessment.
- The review identifies areas for future innovation in assessing developmental toxicants.
Conclusions:
- Improved risk assessment for developmental toxicants relies on comprehensive data assimilation.
- Future directions may involve more sophisticated quantitative and mechanistic approaches.
- Revolutionizing developmental toxicology requires continued innovation in risk assessment methodologies.