Nicotine-taking and nicotine-seeking in C57Bl/6J mice without prior operant training or food restriction

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• 作者：Yijin Yan^a ; ¹ ; Abhiram Pushparaj^a ; ¹ ; Islam Gamaleddin^a ; Rebecca C. Steiner^b ; Marina R. Picciotto^b ; John Roder^c ; ^d ; Bernard Le Foll^a ; ^e ; ^f ; ^{bernard_lefoll@camh.net}
• 关键词：Nicotine ; Self-administration ; Seeking behavior ; Mice ; Relapse ; Dependence
• 刊名：Behavioural Brain Research
• 出版年：2012
• 期刊代码：3_01664328
• 类别：neu
• 出版时间：21 April, 2012
• 卷：230
• 期：1
• 页码：34-39
• 文件大小：322 K

摘要

The ability to examine genetically engineered mice in a chronic intravenous (IV) nicotine self-administration paradigm will be a powerful tool for investigating the contribution of specific genes to nicotine reinforcement and more importantly, to relapse behavior. Here we describe a reliable model of nicotine-taking and -seeking behavior in male C57BL/6J mice without prior operant training or food restriction. Mice were allowed to self-administer either nicotine (0.03 mg/kg/infusion) or saline in 2-h daily sessions under fixed ratio 1 (FR1) followed by FR2 schedules of reinforcement. In the nicotine group, a dose-response curve was measured after the nose-poke behavior stabilized. Subsequently, nose-poke behavior was extinguished and ability of cue presentations, priming injections of nicotine, or intermittent footshock to reinstate responding was assessed in both groups. C57BL/6J mice given access to nicotine exhibited high levels of nose-poke behavior and self-administered a high number of infusions as compared to mice given access to saline. After this acquisition phase, changing the unit-dose of nicotine resulted in a flat dose-response curve for nicotine-taking and subsequently reinstatement of nicotine-seeking behavior was achieved by both nicotine-associated light cue presentation and intermittent footshock. Nicotine priming injections only triggered significant reinstatement on the second consecutive day of priming. In contrast, mice previously trained to self-administer saline did not increase their responding under those conditions. These results demonstrate the ability to produce nicotine-taking and nicotine-seeking behavior in naive C57BL/6J mice without both prior operant training and food restriction. Future work will utilize these models to evaluate nicotine-taking and relapsing behavior in genetically-altered mice.