Abstract
Rationale
The maturing adolescent brain has been suggested to be more sensitive than the adult brain to ethanol-induced neuroadaptations. In animal studies, sensitization to the stimulant effects of ethanol is used to study the vulnerability to chronic ethanol-induced neurobehavioral alterations.
Objectives
The aim of the present study was to systematically characterize age-dependent changes in the development and expression of the sensitization to the stimulant effects of a range of ethanol doses in female Swiss mice. Three ages were studied: 21-day-old mice (postweanlings), 35-day-old mice (adolescents), and 63-day-old mice (adults).
Methods
Postweanling, adolescent, and adult mice were daily injected with saline or various ethanol doses (1.5 to 4 g/kg) for 7 days. They were then tested for acute and sensitized locomotor activity.
Results
Postweanling and adolescent mice were more sensitive than adult mice to the acute stimulant effects of ethanol. In adult mice, daily injections of ethanol at doses between 2.5 and 4 g/kg led to significant sensitization. Higher ethanol doses (3.5 and 4 g/kg) were required to induce sensitization in postweanling and adolescent mice. However, younger mice showed ethanol sensitization of higher magnitude.
Conclusions
Young mice develop very strong ethanol sensitization at doses that mimic binge drinking in humans. These results might explain why early ethanol drinking during adolescence is related to a higher prevalence of subsequent alcohol disorders.
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Acknowledgements
This work was supported by grants from Fonds National de la Recherche Scientifique (FNRS) and Fonds Spéciaux pour la Recherche de l’Université de Liège obtained by Etienne Quertemont. Caroline Quoilin is a research assistant under contract with the FNRS.
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Quoilin, C., Didone, V., Tirelli, E. et al. Developmental differences in ethanol-induced sensitization using postweanling, adolescent, and adult Swiss mice. Psychopharmacology 219, 1165–1177 (2012). https://doi.org/10.1007/s00213-011-2453-7
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DOI: https://doi.org/10.1007/s00213-011-2453-7