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Rapid Evaluation of Toxicity of Chemical Compounds Using Zebrafish Embryos
Published on: August 25, 2019
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Abamectin induces rapid and reversible hypoactivity within early zebrafish embryos
Tara D Raftery1, David C Volz1
1Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA.
Neurotoxicology and Teratology
|March 4, 2015
Summary
Abamectin insecticide exposure rapidly and reversibly inhibits zebrafish embryo movement by potentially targeting the GABA receptor. This study investigates the mechanism behind abamectin-induced hypoactivity in early zebrafish development.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Early zebrafish embryogenesis exhibits spontaneous tail contractions as the first locomotive behavior.
- Abamectin exposure during early development abolishes this spontaneous activity without affecting survival or morphology.
Purpose of the Study:
- To investigate the mechanism of abamectin-induced hypoactivity in zebrafish embryos.
- To determine if abamectin affects neurotransmission and identify potential molecular targets.
Main Methods:
- Zebrafish embryos were exposed to abamectin at various developmental stages.
- Neurite outgrowth was assessed, and recovery of activity after exposure was monitored.
- GABA receptor antagonist pretreatment and quantitative PCR were used to explore the role of the GABA receptor.
Main Results:
- Abamectin eliminated spontaneous activity at low micromolar concentrations, independent of neurite outgrowth.
- Activity recovered fully upon removal from abamectin, indicating a reversible effect.
- Pretreatment with GABA receptor antagonists blocked abamectin-induced hypoactivity, and GABA receptor subunits were confirmed in zebrafish embryos.
Conclusions:
- Abamectin induces rapid, reversible hypoactivity in zebrafish embryos.
- The mechanism likely involves reversible activation of ligand-gated chloride channels, potentially through the GABA receptor.
