The rostromedial tegmental nucleus (RMTg), a GABAergic afferent to midbrain dopamine neurons, encodes aversive stimuli and inhibits motor responses.

The rostromedial tegmental nucleus (RMTg), a GABAergic afferent to midbrain dopamine neurons, encodes aversive stimuli and inhibits motor responses.
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DOI:
10.1016/j.neuron.2009.02.001
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发表时间:
2009-03-12
期刊:
影响因子:
16.2
通讯作者:
Holland, Peter C.
Holland, Peter C.
中科院分区:
医学1区
文献类型:
--
作者:
Jhou, Thomas C.;Fields, Howard L.;Baxter, Mark G.;Saper, Clifford B.;Holland, Peter C.

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单独的研究表明,侧链核(LHb)或杏仁核相关区域在处理厌恶刺激中起作用,但它们彼此之间以及与食欲动机系统之间的关系尚不清楚。我们发现,最近发现的GABAergic rostromedial tetemental nucleus (RMTg)中的神经元接受主要的LHb输入,大量投射到中脑多巴胺神经元,并在厌恶刺激(足部冲击、冲击预测提示、食物剥夺或奖励遗漏)后表现出相激活和/或Fos诱导,在奖励或奖励预测刺激后表现出抑制。RMTg病变显著减少被动恐惧行为(冻结、张开手臂回避),这些行为依赖于扩展的杏仁核、导水管周围灰质或中隔,这些区域都直接投射到RMTg。相比之下,RMTg病变在这些相同的范式中减少或增强了积极的恐惧反应(踩踏,逃跑)。这些发现表明,来自广泛大脑区域和刺激模式的厌恶输入汇聚到RMTg,这与中脑多巴胺神经元的奖励和运动激活功能相反
Separate studies have implicated the lateral habenula (LHb) or amygdala-related regions in processing aversive stimuli, but their relationships to each other and to appetitive motivational systems are poorly understood. We show that neurons in the recently identified GABAergic rostromedial tegmental nucleus (RMTg), which receive a major LHb input, project heavily to midbrain dopamine neurons, and show phasic activations and/or Fos induction after aversive stimuli (footshocks, shock-predictive cues, food deprivation, or reward omission) and inhibitions after rewards or reward-predictive stimuli. RMTg lesions markedly reduce passive fear behaviors (freezing, open-arm avoidance) dependent on the extended amygdala, periaqueductal gray, or septum, all regions that project directly to the RMTg. In contrast, RMTg lesions spare or enhance active fear responses (treading, escape) in these same paradigms. These findings suggest that aversive inputs from widespread brain regions and stimulus modalities converge onto the RMTg, which opposes reward and motor-activating functions of midbrain dopamine neurons
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