Chronic ethanol exposure during adolescence in rats induces motor impairments and cerebral cortex damage associated with oxidative stress

PLoS One. 2014 Jun 26;9(6):e101074. doi: 10.1371/journal.pone.0101074. eCollection 2014.

Abstract

Binge drinking is common among adolescents, and this type of ethanol exposure may lead to long-term nervous system damage. In the current study, we evaluated motor performance and tissue alterations in the cerebral cortex of rats subjected to intermittent intoxication with ethanol from adolescence to adulthood. Adolescent male Wistar rats (35 days old) were treated with distilled water or ethanol (6.5 g/kg/day, 22.5% w/v) during 55 days by gavage to complete 90 days of age. The open field, inclined plane and the rotarod tests were used to assess the spontaneous locomotor activity and motor coordination performance in adult animals. Following completion of behavioral tests, half of animals were submitted to immunohistochemical evaluation of NeuN (marker of neuronal bodies), GFAP (a marker of astrocytes) and Iba1 (microglia marker) in the cerebral cortex while the other half of the animals were subjected to analysis of oxidative stress markers by biochemical assays. Chronic ethanol intoxication in rats from adolescence to adulthood induced significant motor deficits including impaired spontaneous locomotion, coordination and muscle strength. These behavioral impairments were accompanied by marked changes in all cellular populations evaluated as well as increased levels of nitrite and lipid peroxidation in the cerebral cortex. These findings indicate that continuous ethanol intoxication from adolescence to adulthood is able to provide neurobehavioral and neurodegenerative damage to cerebral cortex.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Astrocytes / drug effects
  • Astrocytes / metabolism
  • Body Weight / drug effects
  • Cell Count
  • Cerebral Cortex / drug effects*
  • Cerebral Cortex / metabolism
  • Cerebral Cortex / pathology*
  • Ethanol / administration & dosage*
  • Lipid Peroxidation / drug effects
  • Male
  • Microglia / drug effects
  • Microglia / metabolism
  • Neurons / drug effects
  • Neurons / metabolism
  • Nitrites / metabolism
  • Oxidative Stress*
  • Physical Exertion / drug effects*
  • Psychomotor Performance / drug effects
  • Rats

Substances

  • Nitrites
  • Ethanol

Grants and funding

Francisco Bruno Teixeira was supported by a Brazilian Government/Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) fellowship. Fernando Romualdo Bezerra was supported by a Brazilian Government/Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) fellowship. R.D.P. is supported by a research fellowship from CNPq. The authors would like to thank the PROPESP - UFPA for providing financial support (PAPQ). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.