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Ethanol- and acetaldehyde-mediated developmental toxicity in zebrafish
Mark J Reimers1, Amanda R Flockton, Robert L Tanguay
1Department of Environmental and Molecular Toxicology, Oregon State University, 1007 Agriculture and Life Sciences, Corvallis, OR 97331, USA.
Neurotoxicology and Teratology
|September 29, 2004
Summary
Zebrafish embryos exposed to ethanol and acetaldehyde showed developmental toxicity. Acetaldehyde was more toxic, but ethanol proved more teratogenic, highlighting zebrafish as a model for studying ethanol
Area of Science:
- Developmental toxicology
- Comparative toxicology
- Vertebrate embryogenesis
Background:
- Ethanol is a known developmental toxicant, but its mechanisms are not fully understood.
- Zebrafish embryos offer a valuable model for assessing chemical and drug toxicity during early development.
Purpose of the Study:
- To compare the developmental toxicity of ethanol and acetaldehyde in zebrafish embryos.
- To investigate the mechanisms of ethanol's teratogenicity using the zebrafish model.
Main Methods:
- Zebrafish embryos were exposed to varying concentrations of waterborne ethanol and acetaldehyde.
- Lethal concentration (LC50) and teratogenic indices (TIs) were determined.
- An alcohol dehydrogenase (ADH) assay was adapted to estimate embryonic ethanol dosage.
Main Results:
- Ethanol exposure caused pericardial and yolk sac edema, axial malformations, otolith defects, and blistering.
- Zebrafish were nearly 1000 times more sensitive to acetaldehyde than to ethanol.
- Despite higher sensitivity to acetaldehyde, ethanol exhibited greater teratogenicity.
Conclusions:
- Both ethanol and acetaldehyde negatively impact zebrafish embryonic development.
- Zebrafish serve as a suitable model for further investigation into the mechanisms of ethanol's developmental toxicity.
- Ethanol's teratogenic effects warrant further study in vertebrate development.