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Effect of Zizyphus jujuba Extract on Nicotine Sensitization  

Kim, Young-Man (College of Life Sciences, Dongeui University)
Yang, Chae-Ha (Department of Physiology, College of Oriental Medicine, Daegu Haany University)
Chi, Gyoo-Yong (College of Oriental Medicine, Dongeui University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.20, no.5, 2006 , pp. 1149-1154 More about this Journal
Abstract
Repeated administration of all addictive drugs, including nicotine, can produce sensitization of extracellular dopamine levels in the nucleus accumbens and behavioral sensitization in rat, as evidenced by an enhanced locomotor response and increased dopamine release in brain to a subsequent injection of the drug. In order to investigate the effect of Zizyphus jujuba extract on repeated nicotin-induced sensitization, rats were given repeated injection of saline or nicotine (0.4 mg/kg s.c., twice a day for 7 d), followed by one challenge injection on the 4th day after the last daily injection. Systemic challenge with nicotine (0.4 mg/kg s.c.) and a direct local challenge of 3 mM a larger increase in locomotor activity and extracellular dopamine release in the nucleus accumbens in nicotine-pretreated rats than in saline-pretreated rats, respectively. Zizyphus jujuba extract significantly decreases locomotor activitiy and dopamine release in the nucleus accumbens induced by a nicotine challenge. These results suggest that Zizyphus jujuba extract may attenuate nicotine-induced neurochemical and behavioral sensitization and may be effective in suppressing compulsive nicotine-seeking behavior.
Keywords
nicotine; behavioral sensitization; dopamine; nucleus accumbens;
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