In vitro developmental neurotoxicity (DNT) testing: relevant models and endpoints.

Area of Science:

• Neuroscience
• Toxicology
• Developmental Biology

Background:

• The developing brain in children is highly vulnerable to environmental chemical exposure due to ongoing complex developmental processes.
• Children face increased susceptibility from factors including incomplete blood-brain barrier development, higher exposure, and less efficient defense mechanisms.
• Existing safety assessments face challenges in evaluating developmental neurotoxicity (DNT) for regulatory requirements.

Purpose of the Study:

• To discuss new challenges and approaches for developmental neurotoxicity (DNT) safety assessments.
• To explore the integration of in vitro methods and emerging technologies for DNT evaluation.
• To present relevant models and endpoints for in vitro DNT testing.

Main Methods:

• Discussion of in vitro testing strategies and the integration of bioinformatics.
• Presentation of primary neuronal cultures (e.g., cerebellar granule cells), 3D aggregate models, and stem cell applications for DNT.
• Identification of emerging technologies like gene expression, electrical activity measurements, and metabonomics.

Main Results:

• In vitro models incorporating key brain development processes (proliferation, migration, differentiation) are relevant for DNT evaluation.
• Emerging technologies offer promising tools for assessing DNT.
• An integrated in vitro approach can accelerate DNT evaluation by prioritizing chemicals.

Conclusions:

• In vitro methods, combined with emerging technologies, can form the basis of an intelligent testing strategy for DNT.
• These approaches hold potential for more efficient and predictive safety assessments of environmental chemicals.
• Further development and integration of these methods are crucial for regulatory safety evaluations.