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Updated: Mar 16, 2026
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Rapid Evaluation of Toxicity of Chemical Compounds Using Zebrafish Embryos
Published on: August 25, 2019
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Comparative Developmental Toxicity of Flavonoids Using an Integrative Zebrafish System
Sean M Bugel1, Josephine A Bonventre2, Robert L Tanguay3
1*Department of Environmental and Molecular Toxicology, Environmental Health Sciences Center, and the Sinnhuber Aquatic Research Laboratory Sean.Bugel@oregonstate.edu.
Summary
Flavonoids, found in breast milk and formulas, can disrupt early development. Zebrafish studies show 15 of 24 tested flavonoids cause developmental and behavioral issues, independent of estrogen pathways.
Area of Science:
- Environmental Toxicology
- Developmental Biology
- Natural Product Chemistry
Background:
- Flavonoids are widespread bioactive compounds with potential for early life exposure.
- Limited data exists on the developmental toxicity and bioactivity of many flavonoids.
- Early life exposure to environmental chemicals can perturb embryogenesis.
Purpose of the Study:
- To evaluate the developmental toxicity and bioactivity of 24 flavonoids using a zebrafish model.
- To identify specific flavonoids that cause adverse developmental or behavioral effects.
- To investigate the mechanisms of flavonoid-induced developmental toxicity, including estrogen receptor (ER) pathways.
Main Methods:
- Zebrafish embryos were exposed to 24 flavonoids (1-50 µM) from 6 to 120 hours postfertilization (hpf).
- Assessed 26 developmental endpoints and behavioral changes (larval photomotor response).
- Analyzed gene expression for aryl hydrocarbon receptor (AHR) and ER pathway biomarkers.
Main Results:
- 15 of 24 flavonoids caused adverse developmental or behavioral effects.
- Hierarchical clustering identified 3 distinct groups of bioactive flavonoids.
- Toxicity was not ameliorated by ER/GPER antagonists, suggesting non-estrogenic mechanisms.
Conclusions:
- Development is sensitive to perturbation by flavonoids in zebrafish.
- Flavonoid developmental toxicity can occur through pathways independent of traditional ER signaling.
- The zebrafish bioassay is a valuable tool for flavonoid developmental toxicity assessment and hazard prioritization.
