Psychopharmacology

, Volume 173, Issue 1–2, pp 41–48

Effects of periadolescent versus adult cocaine exposure on cocaine conditioned place preference and motor sensitization in mice

  • Nicole L. Schramm-Sapyta
  • Adeola R. Pratt
  • Danny G. Winder
Original Investigation
  • 160 Downloads

Abstract

Rationale

Age of initial exposure to addictive substances is inversely proportional to risk of developing drug dependence. There is debate, however, as to whether intake at a young age causes dependency or whether young people who experiment with addictive substances are predisposed to dependency by other factors.

Objectives

We tested the relationship between cocaine exposure at two different ages in mice and the development of subsequent drug-seeking behavior to test for age-specific exposure effects.

Methods

We performed dose-response analysis of cocaine conditioned place preference (CPP) and locomotor activity in periadolescent and adult C57Bl/6J mice. In addition, we pretreated periadolescent and adult C57Bl/6J mice with cocaine or saline in the home cage or a drug-associated context, and then examined their behavior in a biased CPP procedure in adulthood.

Results

Dose-response relationships were similar between the two age groups. In the pretreatment experiments, we observed locomotor sensitization during the pretreatment in periadolescent but not adult mice. We also observed an enhanced aversion to the non-preferred side of the chamber in periadolescent mice compared to adult mice, which was alleviated by cocaine association with that side. Third, we observed that after further conditioning in adulthood, there were no pretreatment-specific effects.

Conclusions

Our results are consistent with a “vulnerable brain” hypothesis for responses to cocaine based on our findings that periadolescent mice exhibit greater locomotor sensitization to cocaine, and greater baseline anxiety responses that are alleviated by cocaine exposure compared to adult mice.

Keywords

Cocaine Development Adolescent Mouse Conditioned place preference Addiction 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Nicole L. Schramm-Sapyta
    • 1
  • Adeola R. Pratt
    • 1
  • Danny G. Winder
    • 1
    • 2
    • 3
  1. 1.Department of Molecular Physiology and BiophysicsVanderbilt University Medical CenterNashvilleUSA
  2. 2.Center for Molecular Neuroscience and John F. Kennedy Center for Research on Human DevelopmentVanderbilt University Medical CenterNashvilleUSA
  3. 3.724B Robinson Research BuildingVanderbilt University Medical CenterNashvilleUSA

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