VTA CRF neurons mediate the aversive effects of nicotine withdrawal and promote intake escalation.

VTA CRF neurons mediate the aversive effects of nicotine withdrawal and promote intake escalation.
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DOI:
10.1038/nn.3872
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发表时间:
2014-12
影响因子:
25
通讯作者:
George, Olivier
George, Olivier
中科院分区:
医学1区
文献类型:
--
作者:
Grieder, Taryn E.;Herman, Melissa A.;Contet, Candice;Tan, Laura A.;Vargas-Perez, Hector;Cohen, Ami;Chwalek, Michal;Maal-Bared, Geith;Freiling, John;Schlosburg, Joel E.;Clarke, Laura;Crawford, Elena;Koebel, Pascale;Repunte-Canonigo, Vez;Sanna, Pietro P.;Tapper, Andrew R.;Roberto, Marisa;Kieffer, Brigitte L.;Sawchenko, Paul E.;Koob, George F.;van der Kooy, Derek;George, Olivier

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众所周知,腹侧被盖区(VTA)的多巴胺能神经元在调节滥用药物的积极强化效应中起着重要作用。在这里,我们在啮齿动物和人类中发现了一群共同表达促肾上腺皮质激素释放因子(CRF)的VTA多巴胺神经元。我们在啮齿类动物中提供了进一步的证据,表明慢性尼古丁暴露上调了VTA后部多巴胺能神经元中CRF mRNA的表达,激活了局部CRF1受体,并阻断了尼古丁诱导的对多巴胺能神经元的瞬时GABA能输入的激活。局部下调CRF mRNA和阻断VTA内CRF1受体的特异性药理作用可逆转尼古丁对GABA能传入多巴胺能神经元的影响,阻止尼古丁戒断的厌恶效应,限制尼古丁摄取的增加。这些结果将同一脑区的大脑奖赏和压力系统联系在一起,发出尼古丁戒断的负面激励效应的信号。
Dopaminergic neurons in the ventral tegmental area (VTA) are well known for their role in mediating the positive reinforcing effects of drugs of abuse. Here, we identify in rodents and humans a population of VTA dopamine neurons co-expressing corticotropin releasing factor (CRF). We provide further evidence in rodents that chronic nicotine exposure upregulates CRF mRNA in dopaminergic neurons of the posterior VTA, activates local CRF1 receptors, and blocks nicotine-induced activation of transient GABAergic input to dopaminergic neurons. Local downregulation of CRF mRNA and specific pharmacological blockade of CRF1 receptors in the VTA reversed the effect of nicotine on GABAergic input to dopaminergic neurons, prevented the aversive effects of nicotine withdrawal, and limited the escalation of nicotine intake. These results link the brain reward and stress systems within the same brain region in signaling the negative motivational effects of nicotine withdrawal.
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