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Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons
Published on: February 5, 2015
Neuronal in vitro models for the estimation of acute systemic toxicity
A Forsby1, A K Bal-Price, A Camins
1Department of Neurochemistry, The Arrhenius Laboratories for Natural Sciences, Stockholm University, Stockholm, Sweden. annaf@neurochem.su.se
Summary
Predicting acute systemic toxicity involves combining general cytotoxicity, organ-specific tests, and biokinetic data. Neurotoxicity endpoints like GABA(A) receptor function and gene expression show promise for improved in vitro-in vivo correlation.
Area of Science:
- Toxicology
- Neuroscience
- In vitro toxicology
Background:
- Current methods for predicting acute systemic toxicity require improvement.
- The ACuteTox project aims to enhance in vitro prediction by integrating cytotoxicity, organ-specific endpoints, and biokinetics.
- Neurotoxicity is a critical aspect of systemic toxicity assessment.
Purpose of the Study:
- To develop a strategy for in vitro prediction of oral acute systemic toxicity.
- To identify reliable neurotoxicity endpoints for improved in vitro-in vivo correlation.
- To evaluate the contribution of specific neuronal endpoints and biokinetic data.
Main Methods:
- Tested 23 reference chemicals using neuronal cell lines, primary cultures, brain slices, and aggregated brain cell cultures.
- Assessed approximately 50 neurotoxicity endpoints.
- Compared in vitro neurotoxicity data with general cytotoxicity and in vivo acute toxicity data.
Main Results:
- Identified GABA(A) receptor function, acetylcholine esterase activity, cell membrane potential, glucose uptake, RNA expression, and specific gene expressions (NF-H, GFAP, MBP, HSP32, caspase-3) as key neurotoxicity endpoints.
- These endpoints showed potential for improved in vitro-in vivo correlation when tested with 36 additional chemicals.
- No single neuronal endpoint alone provided perfect correlation; a combination of endpoints and biokinetic data is necessary.
Conclusions:
- A multi-endpoint strategy combining specific neurotoxicity assays with biokinetic data is essential for accurate in vitro prediction of acute systemic toxicity.
- The identified endpoints offer a promising foundation for developing a more predictive in vitro testing strategy.
- Further validation with additional chemicals confirmed the need for integrated approaches.
