Are adverse outcome pathways here to stay?

Area of Science:

• Toxicology
• Environmental Science
• Chemical Safety

Background:

• Increasing societal pressure to reduce animal testing and enhance animal welfare.
• Demand for more predictive and human-relevant toxicity testing methods.
• Need for accelerated screening of numerous chemicals for human and ecological health hazards.

Purpose of the Study:

• To explore new approaches for chemical screening that minimize animal testing.
• To increase the predictivity and human-relevance of toxicity assessments.
• To develop frameworks for evaluating chemical risks in both human and ecological health.

Main Methods:

• Adoption of a toxicological pathway-based approach for health assessments.
• Integration of in vitro systems and predictive modeling.
• Utilizing conserved molecular initiating and key events for risk assessment.

Main Results:

• Pathway-based analysis offers novel methods for understanding chemical exposure risks.
• Conservation of molecular initiating events provides a framework for cross-species extrapolation.
• Potential to decrease or eliminate animal testing while enhancing predictive accuracy.

Conclusions:

• Toxicological pathway-based approaches are crucial for modern chemical safety assessment.
• Nontraditional methods, including in vitro systems and predictive models, are vital for future toxicity testing.
• A conserved pathway framework supports robust ecological risk assessment and human health evaluations.