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Biała, Grażyna; Budzyńska, Barbara
Pharmacological reports, 09/2010, Volume: 62, Issue: 5Journal Article
The present study focused on the evaluation of behavioral sensitization, cross-sensitization, and cross-reinstatement processes induced by nicotine and ethanol in rodents. First, we showed that nicotine (0.175 mg/kg, base, intraperitoneally, ip) produced a conditioned place preference in rats. When the nicotine place preference was extinguished, nicotine-experienced animals were challenged with nicotine (0.175 mg/kg, ip) or ethanol (0.5 g/kg, ip), which reinstated a preference for the compartment previously paired with nicotine. In the second series of experiments, we demonstrated that after 9 days of nicotine administration (0.175 mg/kg, subcutaneously, sc) every other day and following its 7-day withdrawal, challenge doses of nicotine (0.175 mg/kg, sc) and ethanol (2 g/kg, ip) induced locomotor sensitization in mice. Finally, when we examined the influence of rimonabant (0.5, 1 and 2 mg/kg, ip), we found that this cannabinoid CB₁ receptor antagonist attenuated reinstatement effect of ethanol priming as well as nicotine sensitization and locomotor cross-sensitization between nicotine and ethanol. Our results indicate that similar endocannabinoid-dependent mechanisms re involved in the locomotor stimulant and reinforcing effects of nicotine and ethanol in rodents, and as such these data may provide further evidence for the use of cannabinoid CB₁ receptor antagonists in treatment of tobacco addiction with or without concomitant ethanol dependence.
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