Novelty-induced locomotion is positively associated with cocaine ingestion in adolescent rats; anxiety is correlated in adults.

Published

Journal Article

The present studies assessed the roles of sex, age, novelty-seeking and plus-maze behavior on cocaine drinking in rats. Cocaine/saccharin solution was available in three daily, 5-hour sessions then a saccharin-only solution was also available in following sessions. In the one-bottle drinking phase, early and late adolescent males, post-natal day 28 (PN28) and PN42, consumed more cocaine/saccharin solution than young adults (PN65), but females did not exhibit significant age differences. Adolescents of both sexes consumed more cocaine/saccharin than adults during choice drinking. Saccharin availability in the two-bottle trials decreased cocaine/saccharin consumption in PN28 and PN65 rats. After a drug-free period, cocaine-stimulated locomotion was lower in cocaine/saccharin drinking than saccharin-only males, indicating tolerance. We tested the hypothesis that individual differences in pre-screened behavioral traits would correlate with cocaine/saccharin consumption in PN28 and PN65 male rats. High locomotor responses to novelty were associated with greater cocaine/saccharin drinking in adults in one-bottle sessions. In the subsequent choice drinking phase, correlations were age-specific. Adolescents with high novelty-induced locomotion and adults that spent less time on open arms of the elevated plus-maze drank more cocaine/saccharin. Thus, behavioral phenotypes correlated with individual differences in cocaine/saccharin consumption in an age-related manner.

Full Text

Duke Authors

Cited Authors

  • Walker, QD; Schramm-Sapyta, NL; Caster, JM; Waller, ST; Brooks, MP; Kuhn, CM

Published Date

  • January 2009

Published In

Volume / Issue

  • 91 / 3

Start / End Page

  • 398 - 408

PubMed ID

  • 18790706

Pubmed Central ID

  • 18790706

International Standard Serial Number (ISSN)

  • 0091-3057

Digital Object Identifier (DOI)

  • 10.1016/j.pbb.2008.08.019

Language

  • eng

Conference Location

  • United States