躯体感觉抑制在小鼠前额皮质中的结构组织。

Structural Organization of Perisomatic Inhibition in the Mouse Medial Prefrontal Cortex.

机构信息

Eötvös Loránd Research Network Institute of Experimental Medicine, 1083 Budapest, Hungary.

János Szentágothai School of Neurosciences, Semmelweis University, 1085 Budapest, Hungary.

出版信息

J Neurosci. 2023 Oct 18;43(42):6972-6987. doi: 10.1523/JNEUROSCI.0432-23.2023. Epub 2023 Aug 28.

Abstract

Perisomatic inhibition profoundly controls neural function. However, the structural organization of inhibitory circuits giving rise to the perisomatic inhibition in the higher-order cortices is not completely known. Here, we performed a comprehensive analysis of those GABAergic cells in the medial prefrontal cortex (mPFC) that provide inputs onto the somata and proximal dendrites of pyramidal neurons. Our results show that most GABAergic axonal varicosities contacting the perisomatic region of superficial (layer 2/3) and deep (layer 5) pyramidal cells express parvalbumin (PV) or cannabinoid receptor type 1 (CB1). Further, we found that the ratio of PV/CB1 GABAergic inputs is larger on the somatic membrane surface of pyramidal tract neurons in comparison with those projecting to the contralateral hemisphere. Our morphologic analysis of labeled PV+ basket cells (PVBC) and CCK/CB1+ basket cells (CCKBC) revealed differences in many features. PVBC dendrites and axons arborized preferentially within the layer where their soma was located. In contrast, the axons of CCKBCs expanded throughout layers, although their dendrites were found preferentially either in superficial or deep layers. Finally, using anterograde trans-synaptic tracing we observed that PVBCs are preferentially innervated by thalamic and basal amygdala afferents in layers 5a and 5b, respectively. Thus, our results suggest that PVBCs can control the local circuit operation in a layer-specific manner via their characteristic arborization, whereas CCKBCs rather provide cross-layer inhibition in the mPFC. Inhibitory cells in cortical circuits are crucial for the precise control of local network activity. Nevertheless, in higher-order cortical areas that are involved in cognitive functions like decision-making, working memory, and cognitive flexibility, the structural organization of inhibitory cell circuits is not completely understood. In this study we show that perisomatic inhibitory control of excitatory cells in the medial prefrontal cortex is performed by two types of basket cells endowed with different morphologic properties that provide inhibitory inputs with distinct layer specificity on cells projecting to disparate areas. Revealing this difference in innervation strategy of the two basket cell types is a key step toward understanding how they fulfill their distinct roles in cortical network operations.

摘要

树突簇状抑制深刻地控制着神经功能。然而,产生高级皮质中树突簇状抑制的抑制性回路的结构组织尚不完全清楚。在这里,我们对内侧前额叶皮质(mPFC)中提供树突和近端树突传入的 GABA 能细胞进行了全面分析。我们的结果表明,大多数与浅层(第 2/3 层)和深层(第 5 层)锥体神经元的树突簇状区接触的 GABA 能轴突末梢表达囊泡蛋白(PV)或大麻素受体 1(CB1)。此外,我们发现与投射到对侧半球的神经元相比,在锥体神经元的胞体膜表面上,PV/CB1 GABA 能传入的比例更大。我们对标记的 PV+篮状细胞(PVBC)和 CCK/CB1+篮状细胞(CCKBC)的形态学分析显示出许多特征上的差异。PVBC 的树突和轴突优先在其胞体所在的层内分枝。相比之下,CCKBC 的轴突则扩展到所有层,但它们的树突则主要存在于浅层或深层。最后,我们通过顺行转导性突触追踪观察到,PVBC 分别优先被丘脑和基底杏仁核传入纤维支配,这些传入纤维分别位于第 5a 和 5b 层。因此,我们的结果表明,PVBC 可以通过其特征性的分枝以层特异性的方式控制局部回路的运作,而 CCKBC 则在 mPFC 中提供跨层抑制。皮质回路中的抑制性细胞对于局部网络活动的精确控制至关重要。然而,在参与决策、工作记忆和认知灵活性等认知功能的高级皮质区域,抑制性细胞回路的结构组织尚不完全清楚。在这项研究中,我们表明内侧前额叶皮质中兴奋性细胞的树突簇状抑制是由两种具有不同形态特性的篮状细胞完成的,这两种细胞提供了具有不同层特异性的抑制性输入,投射到不同区域的细胞受到不同的抑制性输入。揭示这两种篮状细胞类型在支配策略上的差异是理解它们在皮质网络运作中如何发挥不同作用的关键步骤。

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