Conditional knockout of NMDA receptors in dopamine neurons prevents nicotine-conditioned place preference.

Conditional knockout of NMDA receptors in dopamine neurons prevents nicotine-conditioned place preference.
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DOI:
10.1371/journal.pone.0008616
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发表时间:
2010-01-07
期刊:
影响因子:
3.7
通讯作者:
Tsien JZ
Tsien JZ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang LP;Li F;Shen X;Tsien JZ

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吸烟产生的尼古丁是最常见的成瘾行为之一,具有重大的社会和健康后果。众所周知,尼古丁通过激活中脑多巴胺能奖赏系统中的尼古丁乙酰胆碱受体(NAChRs),主要通过腹侧被盖区来触发烟草成瘾。该地区细胞群体的异质性使得基于药理学的分析很难准确评估尼古丁成瘾中谷氨酸能输入到多巴胺神经元的功能意义。通过使用cre/loxP介导的方法产生多巴胺神经元特异性NR1基因敲除小鼠,我们证明了腹侧被盖区多巴胺神经元NMDA受体的遗传失活选择性地阻止了尼古丁条件位置偏爱。有趣的是,突变小鼠在由厌恶的空气喷发引起的条件性位置厌恶中表现出正常的表现。因此,这种对成瘾药物诱导的强化行为的选择性作用表明,多巴胺神经元中的NMDA受体在尼古丁成瘾的形成中起关键作用。
Nicotine from smoking tobacco produces one of the most common forms of addictive behavior and has major societal and health consequences. It is known that nicotine triggers tobacco addiction by activating nicotine acetylcholine receptors (nAChRs) in the midbrain dopaminergic reward system, primarily via the ventral tegmental area. Heterogeneity of cell populations in the region has made it difficult for pharmacology-based analyses to precisely assess the functional significance of glutamatergic inputs to dopamine neurons in nicotine addiction. By generating dopamine neuron-specific NR1 knockout mice using cre/loxP-mediated method, we demonstrate that genetic inactivation of the NMDA receptors in ventral tegmental area dopamine neurons selectively prevents nicotine-conditioned place preference. Interestingly, the mutant mice exhibit normal performances in the conditioned place aversion induced by aversive air puffs. Therefore, this selective effect on addictive drug-induced reinforcement behavior suggests that NMDA receptors in the dopamine neurons are critical for the development of nicotine addiction.
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