Periaqueductal efferents to dopamine and GABA neurons of the VTA.

Periaqueductal efferents to dopamine and GABA neurons of the VTA.
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DOI:
10.1371/journal.pone.0190297
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Lüscher C
Lüscher C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ntamati NR;Creed M;Achargui R;Lüscher C

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导水管周围灰质 (PAG) 中的神经元调节威胁反应和伤害感受。另一方面,腹侧被盖区(VTA)的活动会引起强化和厌恶。虽然在许多情况下这些行为是相关的,但 PAG 和 VTA 之间串扰的解剖学基础仍然知之甚少。在这里,我们描述了 VTA 投射的 PAG 神经元的解剖学和电生理学组织。使用基于狂犬病的细胞类型特异性逆行追踪,我们观察到 PAG 到 VTA 的投射神经元沿 PAG 的头尾轴均匀分布,但集中在其后段和腹外侧段。光遗传学投射靶向表明,PAG-to-VTA 通路主要是兴奋性的,并且靶向相似比例的表达 Ih 的 VTA DA 和 GABA 神经元。总而言之,这些结果为 PAG 和 VTA 在奖赏和厌恶调节中相互作用的功能分析奠定了框架。
Neurons in the periaqueductal gray (PAG) modulate threat responses and nociception. Activity in the ventral tegmental area (VTA) on the other hand can cause reinforcement and aversion. While in many situations these behaviors are related, the anatomical substrate of a crosstalk between the PAG and VTA remains poorly understood. Here we describe the anatomical and electrophysiological organization of the VTA-projecting PAG neurons. Using rabies-based, cell type-specific retrograde tracing, we observed that PAG to VTA projection neurons are evenly distributed along the rostro-caudal axis of the PAG, but concentrated in its posterior and ventrolateral segments. Optogenetic projection targeting demonstrated that the PAG-to-VTA pathway is predominantly excitatory and targets similar proportions of Ih-expressing VTA DA and GABA neurons. Taken together, these results set the framework for functional analysis of the interplay between PAG and VTA in the regulation of reward and aversion.
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