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皮肤中MRGPRD游离神经末梢和C型低阈值机械感受器的转录谱分析

Transcriptional Profiling of Cutaneous MRGPRD Free Nerve Endings and C-LTMRs.

作者信息

Reynders Ana, Mantilleri Annabelle, Malapert Pascale, Rialle Stéphanie, Nidelet Sabine, Laffray Sophie, Beurrier Corinne, Bourinet Emmanuel, Moqrich Aziz

机构信息

Aix-Marseille-Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, Case 907, 13288 Marseille Cedex 09, France.

Laboratories of Excellence, Ion Channel Science and Therapeutics, Institut de Génomique Fonctionnelle, UMR 5203, CNRS, U1191, INSERM, Université de Montpellier, 141 Rue de la Cardonille, 34094 Montpellier Cedex 05, France.

出版信息

Cell Rep. 2015 Feb 17;10(6):1007-1019. doi: 10.1016/j.celrep.2015.01.022. Epub 2015 Feb 13.

Abstract

Cutaneous C-unmyelinated MRGPRD free nerve endings and C-LTMRs innervating hair follicles convey two opposite aspects of touch sensation: a sensation of pain and a sensation of pleasant touch. The molecular mechanisms underlying these diametrically opposite functions are unknown. Here, we used a mouse model that genetically marks C-LTMRs and MRGPRD neurons in combination with fluorescent cell surface labeling, flow cytometry, and RNA deep-sequencing technology (RNA-seq). Cluster analysis of RNA-seq profiles of the purified neuronal subsets revealed 486 and 549 genes differentially expressed in MRGPRD-expressing neurons and C-LTMRs, respectively. We validated 48 MRGPD- and 68 C-LTMRs-enriched genes using a triple-staining approach, and the Ca3.3 channel, found to be exclusively expressed in C-LTMRs, was validated using electrophysiology. Our study greatly expands the molecular characterization of C-LTMRs and suggests that this particular population of neurons shares some molecular features with Aβ and Aδ low-threshold mechanoreceptors.

摘要

皮肤中无髓鞘的MRGPRD游离神经末梢和支配毛囊的C-LTMRs传递触觉的两个相反方面:痛觉和愉悦触觉。这些截然相反功能背后的分子机制尚不清楚。在这里,我们使用了一种小鼠模型,该模型通过荧光细胞表面标记、流式细胞术和RNA深度测序技术(RNA-seq)对C-LTMRs和MRGPRD神经元进行基因标记。对纯化的神经元亚群的RNA-seq图谱进行聚类分析,发现分别有486个和549个基因在表达MRGPRD的神经元和C-LTMRs中差异表达。我们使用三重染色方法验证了48个富含MRGPD和68个富含C-LTMRs的基因,并使用电生理学验证了仅在C-LTMRs中表达的Ca3.3通道。我们的研究极大地扩展了C-LTMRs的分子特征,并表明这一特定神经元群体与Aβ和Aδ低阈值机械感受器具有一些分子特征。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d875/4542317/7d19a9bac78d/fx1.jpg

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