Current Challenges to Align Inflammatory Key Events in Animals and Lung Cell Models In Vitro.

Loncarevic, Isidora; Mutlu, Seyran; Dzepic, Martina; Keshavan, Sandeep; Petri-Fink, Alke; Blank, Fabian; Rothen-Rutishauser, Barbara (2024). Current Challenges to Align Inflammatory Key Events in Animals and Lung Cell Models In Vitro. (In Press). Chemical research in toxicology 10.1021/acs.chemrestox.4c00113

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With numerous novel and innovative in vitro models emerging every year to reduce or replace animal testing, there is an urgent need to align the design, harmonization, and validation of such systems using in vitro-in vivo extrapolation (IVIVE) approaches. In particular, in inhalation toxicology, there is a lack of predictive and prevalidated in vitro lung models that can be considered a valid alternative for animal testing. The predictive power of such models can be enhanced by applying the Adverse Outcome Pathways (AOP) framework, which casually links key events (KE) relevant to IVIVE. However, one of the difficulties identified is that the endpoint analysis and readouts of specific assays in in vitro and animal models for specific toxicants are currently not harmonized, making the alignment challenging. We summarize the current state of the art in endpoint analysis in the two systems, focusing on inflammatory-induced effects and providing guidance for future research directions to improve the alignment.

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