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Related Experiment Video

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Author Spotlight: High-Throughput Toxicity Screening Using Zebrafish Embryo Startle Response Assay
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The multi-dimensional embryonic zebrafish platform predicts flame retardant bioactivity.

Lisa Truong1, Skylar Marvel2, David M Reif2

  • 1Department of Environmental and Molecular Toxicology, the Sinnhuber Aquatic Research Laboratory and the Environmental Health Sciences Center at Oregon State University, Corvallis, OR, USA.

Reproductive Toxicology (Elmsford, N.Y.)
|August 23, 2020
PubMed
Summary

Flame retardant chemicals (FRCs) pose health risks. Zebrafish embryo models efficiently screen FRCs for developmental toxicity and neurotoxicity, enabling accurate hazard prediction based on chemical structure.

Keywords:
Benchmark doseClassification modelDevelopmental toxicityFlame retardantsLowest effect concentrationNeurotoxicity

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Area of Science:

  • Environmental Toxicology
  • Developmental Toxicology
  • Neurotoxicology

Background:

  • Flame retardant chemicals (FRCs) are prevalent in consumer products, raising human exposure concerns.
  • Safer alternatives to older FRCs are sought, but data on newer compounds' bioactivity is limited.
  • Efficient screening methods are crucial for evaluating the toxicity of existing and novel FRCs.

Purpose of the Study:

  • To develop efficient screening methods for assessing the toxicity of flame retardant chemicals (FRCs).
  • To evaluate the developmental toxicity and neurotoxicity of 61 FRCs using an embryonic zebrafish model.
  • To compare zebrafish assay data with existing in vitro assay data from ToxCast and Tox21.

Main Methods:

  • A library of 61 flame retardant chemicals (FRCs) was assembled.
  • Embryonic zebrafish were used to assess developmental toxicity and potential neurotoxicity.
  • Data from zebrafish assays were compared with publicly available in vitro data from ToxCast, Tox21, and other models.

Main Results:

  • 19 of 45 tested FRCs showed bioactivity in the zebrafish model.
  • Zebrafish assays identified bioactivity in 10 of 12 known developmental neurotoxic FRCs.
  • A classification model using physicochemical properties and zebrafish assays achieved 91.7% balanced accuracy for toxicity prediction.

Conclusions:

  • The embryonic zebrafish model is a sensitive platform for detecting FRC bioactivity and structure-activity relationships.
  • This in vivo platform enhances the ability to predict the hazard potential of new compounds based on chemical structure.
  • The study demonstrates the power of multi-dimensional in vivo testing for reliable toxicity predictions.