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Utilizing Multiple Behavioral Endpoints to Identify Negative Control Chemicals in a Larval Zebrafish Behavior Assay.

Bridget R Knapp1, Deborah L Hunter2, Jeanene K Olin2

  • 1Oak Ridge Institute for Science and Education (ORISE) Research Participation Program Hosted by EPA, Center for Computational Toxicology and Exposure, Biomolecular and Computational Toxicology Division, Rapid Assay Development Branch, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Toxics
|September 27, 2025
PubMed
Summary

This study identified reliable negative control compounds for zebrafish neurotoxicity screening. Six chemicals, including D-mannitol and metformin, showed no behavioral effects, aiding future neurodevelopmental toxicity assessments.

Keywords:
behaviorbehavioral neurotoxicitybenchmark concentrationdevelopmental toxicitynegative control chemicalsneurodevelopmental toxicitypositive controlzebrafish

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Area of Science:

  • Environmental Toxicology
  • Neuroscience
  • Developmental Biology

Background:

  • Reliable negative control compounds are crucial for validating screening assays.
  • A lack of characterized negative controls exists for larval zebrafish developmental neurotoxicity behavioral assays.

Purpose of the Study:

  • To evaluate nine potential negative control chemicals and one positive control (fluoxetine) for developmental and neurodevelopmental toxicity in zebrafish.
  • To establish well-characterized negative controls for larval zebrafish behavioral assays.

Main Methods:

  • Zebrafish embryos (0-5 days post-fertilization) were exposed to chemicals (≤100 µM).
  • Larval behavior (6 dpf) was assessed using a light-dark transition test.
  • Locomotor activity was analyzed via traditional (total distance) and a 13-endpoint method.

Main Results:

  • Ibuprofen, omeprazole, and fluoxetine caused developmental toxicity (teratogenesis); fluoxetine also induced behavioral neurotoxicity.
  • Selegiline hydrochloride's behavioral effects were analysis-method dependent.
  • Six chemicals (D-mannitol, glycerol, L-ascorbic acid, metformin hydrochloride, saccharin, sodium benzoate) and ibuprofen/omeeprazole showed no behavioral effects.

Conclusions:

  • D-mannitol, glycerol, L-ascorbic acid, metformin hydrochloride, saccharin, and sodium benzoate are suitable negative controls for zebrafish neurotoxicity assays.
  • Validated negative controls are essential for accurately screening new chemicals for neurodevelopmental toxicity.
  • This study provides critical tools for enhancing the sensitivity and specificity of developmental neurotoxicity screening.