In Vitro Cytotoxicity Testing and Toxicity Assessment
Summary
The increasing need to evaluate chemical safety without relying on animal models has driven the refinement and diversification of in vitro cytotoxicity assays. These tests involve exposing cultured cells—ranging from simple monolayers to complex three-dimensional systems—to potential toxins and measuring effects on cell viability, proliferation and function. Common endpoints include metabolic reduction (MTT, resazurin), membrane integrity (LDH release, trypan blue exclusion) and lysosomal activity (neutral red uptake). Recent advances integrate humanised cell lines, co-culture models and microphysiological systems to recapitulate tissue-specific metabolism and organ–organ interactions. The incorporation of metabolic activation components, such as human liver S9 fractions, improves detection of pro-toxicants requiring biotransformation. High-content imaging and multiparametric analyses enable simultaneous assessment of oxidative stress, mitochondrial dysfunction and genotoxicity. Standardisation efforts, aligned with international guidelines, enhance reproducibility and regulatory acceptance. Collectively, these strategies underpin a global shift towards ethically responsible, cost-effective and mechanistically informative toxicity assessment, with applications spanning pharmaceuticals, agrochemicals and consumer products.
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In Vitro Cytotoxicity Testing and Toxicity Assessment publication trend
The graph below shows the total number of articles in in vitro cytotoxicity testing and toxicity assessment across all publications each year (not limited to Nature Index journals).
Technical terms
EC50: Concentration of a substance that induces a half-maximal effect on a given biological endpoint.
MTT assay: Colourimetric test measuring mitochondrial dehydrogenase activity as an indicator of cell viability.
S9 fraction: Liver microsomal extract containing metabolic enzymes used to simulate in vivo biotransformation in vitro.
IC50: Concentration of a substance that inhibits a specific cell function by 50 %.
Neutral red uptake: Assay assessing lysosomal integrity via accumulation of the basic dye within viable cells.
Good Laboratory Practice (GLP): Quality system governing laboratory operations to ensure reliability, reproducibility and traceability of data.
References
- Predicting acute oral toxicity using AcutoX: An animal product-free and metabolically relevant human cell-based test.. ALTEX (2024).
- OECD Chemicals Testing Regulation: validity for toxicological studies. Legal regulation in veterinary medicine (2024).
- The study of the cytotoxic effect of disinfectants. Potravinarstvo Slovak Journal of Food Sciences (2023).
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