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大鼠腹侧被盖区的前部和后部以及嘴内侧被盖核从外侧缰核复合体接收拓扑结构上不同的传入纤维。

Anterior and posterior parts of the rat ventral tegmental area and the rostromedial tegmental nucleus receive topographically distinct afferents from the lateral habenular complex.

作者信息

Petzel Anja, Bernard René, Poller Wolfram C, Veh Rüdiger W

机构信息

Charité - Universitätsmedizin Berlin, Institut für Zell- und Neurobiologie, Berlin, Germany.

出版信息

J Comp Neurol. 2017 Jul 1;525(10):2310-2327. doi: 10.1002/cne.24200. Epub 2017 Apr 9.

Abstract

That activation of the reward system involves increased activity of dopaminergic (DA) neurons in the ventral tegmental area (VTA) is widely accepted. In contrast, the lateral habenular complex (LHb), which is known as the center of the anti-reward system, directly and indirectly inhibits DA neurons in the VTA. The VTA, however, is not a homogenous entity. Instead, it displays major functional differences between its anterior (aVTA) and posterior (pVTA) regions. It is not precisely known, whether habenular input to the aVTA, pVTA, and the newly recognized rostromedial tegmental nucleus (RMTg) are similarly or differently organized. Consequently, the present investigation addressed the connections between LHb and aVTA, pVTA, and RMTg using retrograde and anterograde tracing techniques in the rat. Our experiments disclosed strictly reciprocal and conspicuously focal interconnections between LHbM (LHbMPc/LHbMC) and PN, as well as between RLi and LHbLO. In addition, we found that LHb inputs to the aVTA are dorsoventrally ordered. Dorsal parts of the aVTA receive afferents from LHbL and LHbM, whereas ventral parts of the aVTA are preferentially targeted by the LHbM. LHb afferents to the pVTA are distinct from those to the RMTg, given that the RMTg is primarily innervated from the LHbL, whereas pVTA receives afferents from LHbM and LHbL. These data indicate the existence of two separate pathways from the LHb to the VTA, a direct and an indirect one, which may subserve distinct biological functions.

摘要

奖励系统的激活涉及腹侧被盖区(VTA)中多巴胺能(DA)神经元活动增加,这一观点已被广泛接受。相比之下,被称为反奖励系统中心的外侧缰核复合体(LHb)直接或间接抑制VTA中的DA神经元。然而,VTA并非一个同质的实体。相反,它在其前部(aVTA)和后部(pVTA)区域表现出主要的功能差异。目前尚不清楚缰核向aVTA、pVTA以及新发现的嘴内侧被盖核(RMTg)的输入组织方式是相似还是不同。因此,本研究使用逆行和顺行追踪技术研究大鼠中LHb与aVTA、pVTA和RMTg之间的联系。我们的实验揭示了LHbM(LHbMPc/LHbMC)与PN之间以及RLi与LHbLO之间严格的相互连接且明显呈局灶性。此外,我们发现LHb向aVTA的输入在背腹方向上是有序的。aVTA的背侧部分接收来自LHbL和LHbM的传入纤维,而aVTA的腹侧部分则主要由LHbM靶向。LHb向pVTA的传入纤维与向RMTg的不同,因为RMTg主要由LHbL支配,而pVTA接收来自LHbM和LHbL的传入纤维。这些数据表明存在从LHb到VTA的两条独立通路,一条直接通路和一条间接通路,它们可能具有不同的生物学功能。

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