Ethanol produces multiple electrophysiological effects on ventral tegmental area neurons in freely moving rats.

Ethanol produces multiple electrophysiological effects on ventral tegmental area neurons in freely moving rats.
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乙醇对自由运动大鼠腹侧被盖区神经元产生多种电生理效应。

DOI:
10.1111/adb.12899
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发表时间:
2021-03
期刊:
影响因子:
3.4
通讯作者:
Dani JA
Dani JA
中科院分区:
医学2区
文献类型:
--
作者:
Doyon WM;Ostroumov A;Ontiveros T;Gonzales RA;Dani JA

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虽然酒精(即,乙醇)是一种主要的滥用药物,但乙醇对奖赏回路的急性功能作用在体内还没有很好的定义。在自由活动的大鼠中,我们研究了静脉注射乙醇对后腹侧被盖区(VTA)神经元单位活动的影响,VTA是中脑边缘奖励系统的一个中心组成部分。根据电生理学特性和DA D2受体药理学反应的组合,VTA单位被分类为推定的多巴胺(DA)神经元、快速放电GABA神经元和未鉴定的神经元。乙醇的逐渐注入显着增加或减少大多数DA神经元的放电频率在浓度依赖性的方式。大多数DA神经元被乙醇刺激,乙醇也增加了爆发活动,并增加了表现出起搏器样放电模式的DA神经元的比例。与此相反,乙醇介导的GABA和其他身份不明的神经元,是从DA神经元不同的各种影响,包括非线性增加放电率,延迟抑制,和更多的双相活动。这些结果提供了证据的离散的电生理效应的乙醇对DA神经元相比,其他腹侧被盖区细胞类型,这表明一个复杂的作用,在自由移动的动物的腹侧被盖区在酒精诱导的反应。
Although alcohol (i.e., ethanol) is a major drug of abuse, the acute functional effects of ethanol on the reward circuitry are not well defined in vivo. In freely moving rats, we examined the effect of intravenous ethanol administration on neuronal unit activity in the posterior ventral tegmental area (VTA), a central component of the mesolimbic reward system. VTA units were classified as putative dopamine (DA) neurons, fast-firing GABA neurons, and unidentified neurons based on a combination of electrophysiological properties and DA D2 receptor pharmacological responses. A gradual infusion of ethanol significantly increased or decreased the firing rate of most DA neurons in a concentration-dependent manner. The majority of DA neurons were stimulated by ethanol, and ethanol also increased burst activity and increased the proportion of DA neurons that exhibited pacemaker-like firing patterns. In contrast, ethanol mediated a variety of effects in GABA and other unidentified neurons that were distinct from DA neurons, including a non-linear increase in firing rate, delayed inhibition, and more biphasic activity. These results provide evidence of discrete electrophysiological effects of ethanol on DA neurons compared to other VTA cell types, suggesting a complex role of the VTA in alcohol-induced responses in freely moving animals.
神经元型特异性信号,用于腹侧对段区域的奖励和惩罚。
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