• J. Pharmacol. Exp. Ther. · Dec 2003

    Intra-accumbal injection of CART (cocaine-amphetamine regulated transcript) peptide reduces cocaine-induced locomotor activity.

    • Jason N Jaworski, Marie A Kozel, Kelly B Philpot, and Michael J Kuhar.
    • Division of Neuroscience, Yerkes National Primate Research Center of Emory University, 954 Gatewood Road NE, Atlanta, GA 30329, USA. jjawors@rmy.emory.edu
    • J. Pharmacol. Exp. Ther. 2003 Dec 1; 307 (3): 1038-44.

    AbstractEvidence suggests that CART (cocaine-amphetamine regulated transcript) peptides are mediators or modulators of the actions of psychostimulant drugs. In this study, the effects of intra-accumbal injections of rat long form (rl) CART 55-102 were examined. Injection of the peptide alone had no effect, but pretreatment with the peptide blunted or reduced the locomotor-inducing effects of cocaine after an i.p. injection. This effect was dose related and time limited, as expected. rlCART 1-27, a CART peptide fragment not active in other studies, was without effect on cocaine-induced locomotor activity. Because the actions of cocaine involve dopamine, the effect of rlCART 55-102 on dopamine-induced locomotor activity was examined. Intraaccumbal injection of dopamine produced a dose-related and time-limited increase in locomotor activity, as expected. Coinjection of rlCART 55-102 with dopamine blunted the effect. In summary, these data suggest that CART peptides in the nucleus accumbens would tend to oppose the actions of cocaine.

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