ZFIN ID: ZDB-PUB-100820-4
Mitochondrial energetic metabolism perturbations in skeletal muscles and brain of zebrafish (Danio rerio) exposed to low concentrations of waterborne uranium
Lerebours, A., Adam-Guillermin, C., Brèthes, D., Frelon, S., Floriani, M., Camilleri, V., Garnier-Laplace, J., and Bourdineaud, J.P.
Date: 2010
Source: Aquatic toxicology (Amsterdam, Netherlands)   100(1): 66-74 (Journal)
Registered Authors:
Keywords: Uranium, Danio rerio, Skeletal muscles, Brain, Ultrastructure, Mitochondrial respiration, COX
MeSH Terms:
  • Animals
  • Brain/drug effects
  • Brain/metabolism*
  • Cell Respiration/drug effects
  • Electron Transport Chain Complex Proteins/genetics
  • Electron Transport Chain Complex Proteins/metabolism
  • Fish Proteins/metabolism
  • Mitochondria/drug effects
  • Mitochondria/metabolism*
  • Mitochondria, Muscle/drug effects
  • Mitochondria, Muscle/metabolism
  • Muscle, Skeletal/drug effects
  • Muscle, Skeletal/metabolism*
  • Muscle, Skeletal/ultrastructure
  • Toxicity Tests, Chronic
  • Uranium/metabolism
  • Uranium/toxicity*
  • Water Pollutants, Radioactive/metabolism
  • Water Pollutants, Radioactive/toxicity*
  • Zebrafish/metabolism*
PubMed: 20701985 Full text @ Aquat. Toxicol.
Anthropogenic release of uranium (U), originating from the nuclear fuel cycle or military activities, may considerably increase U concentrations in terrestrial and aquatic ecosystems above the naturally occurring background levels found throughout the environment. With a projected increase in the world-wide use of nuclear power, it is important to improve our understanding of the possible effects of this metal on the aquatic fauna at concentrations commensurate with the provisional drinking water guideline value of the World Health Organization (15mugU/L). The present study has examined the mitochondrial function in brain and skeletal muscles of the zebrafish, Danio rerio, exposed to 30 and 100mug/L of waterborne U for 10 and 28 days. At the lower concentration, the basal mitochondrial respiration rate was increased in brain at day 10 and in muscles at day 28. This is due to an increase of the inner mitochondrial membrane permeability, resulting in a decrease of the respiratory control ratio. In addition, levels of cytochrome c oxidase subunit IV (COX-IV) increased in brain at day 10, and those of COX-I increased in muscles at day 28. Histological analyses performed by transmission electron microscopy revealed an alteration of myofibrils and a dilatation of endomysium in muscle cells. These effects were largest at the lowest concentration, following 28 days of exposure.