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Updated: Aug 10, 2026
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Analysis of Oxidative Stress in Zebrafish Embryos
Published on: July 7, 2014
Exploring Chemically-Induced Oxidative Stress: A Comparative Study of Zebrafish Embryos and Maturated HepG2 Cells
Christina H J Veltman1, Edwin P Zwart2, Caroline Versluis2
1Centre for Health Protection, National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands; Division of Drug Discovery and Safety, Leiden Academic centre for Drug research, Leiden University, Leiden, the Netherlands.
Toxicology
|August 8, 2026
Summary
Zebrafish embryos (ZFE) offer a more comprehensive model for assessing oxidative stress from non-genotoxic carcinogens compared to simple cell models. This whole-organism approach reveals potential risks missed by high-throughput cell assays.
Area of Science:
- Toxicology and Ecotoxicology
- Next-Generation Risk Assessment
- Chemical Carcinogenesis
Background:
- Robust mechanism-based assays are crucial for advancing the risk assessment of non-genotoxic carcinogens.
- Oxidative stress induction leading to regenerative proliferation is a known mode of action for these carcinogens.
- Current New Approach Methodologies (NAMs) often use simplified cell models lacking biological complexity and metabolic function.
Purpose of the Study:
- To quantify chemically-induced oxidative stress in zebrafish embryos (ZFE) as a whole-organism model.
- To evaluate the added value of ZFE with functional metabolism compared to high-throughput hepatocyte cell lines.
- To assess the utility of ZFE and HepG2 cells in identifying oxidative stress-inducing chemicals for regulatory risk assessment.
Main Methods:
- Four-day-old ZFE were exposed to 22 chemicals (15 oxidative stress inducers, 7 other modes of action).
- Reactive oxygen species (ROS) quantified in ZFE using the dichloro-dihydro-fluorescein (DCFH) assay after 24-hour exposure.
- ROS induction compared between ZFE and maturated HepG2 cells using DCFH fluorescence during 1-hour exposure, considering internal chemical concentrations.
Main Results:
- Both ZFE and HepG2 models identified nine chemicals with ROS-inducing potency, but with incomplete overlap.
- Of 15 primary oxidative stress inducers, only four were not detected by either model.
- ZFE flagged three chemicals with other primary modes of action for ROS production, unlike HepG2 cells.
Conclusions:
- Zebrafish embryos provide a valuable whole-organism model for detecting oxidative stress induction by chemicals.
- The ZFE model demonstrates added value over simple cell lines by identifying ROS-inducing potential in chemicals with diverse modes of action.
- Findings support the integration of ZFE-based assays into regulatory frameworks for improved chemical risk assessment.
