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Acetylcholine receptors containing the β2 subunit are involved in the reinforcing properties of nicotine

机译:含有β2亚基的乙酰胆碱受体参与尼古丁的增强作用

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Release of the neurotransmitter dopamine in the mesolimbic system of the brain mediates the reinforcing properties of several drugs of abuse, including nicotine. Here we investigate the contribution of the high-affinity neuronal nicotinic acetylcholine receptor to the effects of nicotine on the mesolimbic dopamine system in mice lacking the β2 subunit of this receptor. We found that nicotine stimulates dopamine release in the ventral striatum of wild-type mice but not in the ventral striatum of β2-mutant mice. Using patch-clamp recording, we show that mesencephalic dopaminergic neurons from mice without the β2 subunit no longer respond to nicotine, and that self-administration of nicotine is attenuated in these mutant mice. Our results strongly support the idea that the β2-containing neuronal nicotinic acetylcholine receptor is involved in mediating the reinforcing properties of nicotine.
机译:神经递质多巴胺在大脑中边缘的系统中的释放介导了包括尼古丁在内的几种滥用药物的增强特性。在这里,我们研究了缺乏亲和力的神经元烟碱型乙酰胆碱受体对缺乏该受体β2亚基的小鼠中烟碱多巴胺系统中烟碱的影响。我们发现尼古丁刺激野生型小鼠腹侧纹状体中多巴胺的释放,但不刺激β2突变型小鼠腹侧纹状体中的多巴胺释放。使用膜片钳记录,我们显示了来自无β2亚基的小鼠的中脑多巴胺能神经元不再对尼古丁有反应,并且在这些突变小鼠中尼古丁的自我给药被减弱。我们的结果强烈支持这样的想法,即含β2的神经元烟碱乙酰胆碱受体参与介导尼古丁的增强特性。

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