周圍神經巨噬細胞中存在兩個不同細胞亞群
作者:
小柯機器人發布時間:2020/4/19 21:13:33
比利時VIB炎症研究中心Martin Guilliams、Sophie Janssens以及德國弗萊堡大學Marco Prinz合作取得新進展。他們對周圍神經巨噬細胞進行分析並發現兩個具有不同定位、轉錄組和對損傷反應的巨噬細胞亞群。該研究於2020年4月13日發表於《自然-神經科學》雜誌上。
研究組進行了坐骨神經巨噬細胞(snMacs)的本體、轉錄組和空間表徵分析。使用多個命運映射系統,研究組顯示snMacs並非起源於定植的CNS的早期胚胎前體,而是主要起源於晚期胚胎前體,並隨著時間而被骨髓來源的巨噬細胞所取代。使用單細胞轉錄組學,研究組確定了snMacs和兩個空間上分離的snMacs的組織特異性核心特徵:神經外膜中的Relmα+ Mgl1 + snMacs和神經內膜中的Relmα-Mgl1–snMacs。
在整體上,snMacs缺乏小膠質細胞的大多數核心特徵基因,只有神經內膜亞型表達有限數量的這些基因。對於神經損傷,兩個常駐snMac群體的反應不同。而且,與中樞神經系統不同,在損傷過程中產生的源自單核細胞的巨噬細胞可以有效地植入駐留的周圍神經系統巨噬細胞池中。
據悉,儘管已經廣泛研究了中樞神經系統小膠質細胞,但是對於巨噬細胞在周圍神經系統中的分布知之甚少。
附:英文原文
Title: Profiling peripheral nerve macrophages reveals two macrophage subsets with distinct localization, transcriptome and response to injury
Author: Elke Ydens, Lukas Amann, Bob Asselbergh, Charlotte L. Scott, Liesbet Martens, Dorine Sichien, Omar Mossad, Thomas Blank, Sofie De Prijck, Donovan Low, Takahiro Masuda, Yvan Saeys, Vincent Timmerman, Ralf Stumm, Florent Ginhoux, Marco Prinz, Sophie Janssens, Martin Guilliams
Issue&Volume: 2020-04-13
Abstract: While CNS microglia have been extensively studied, relatively little is known about macrophages populating the peripheral nervous system. Here we performed ontogenic, transcriptomic and spatial characterization of sciatic nerve macrophages (snMacs). Using multiple fate-mapping systems, we show that snMacs do not derive from the early embryonic precursors colonizing the CNS, but originate primarily from late embryonic precursors and become replaced by bone-marrow-derived macrophages over time. Using single-cell transcriptomics, we identified a tissue-specific core signature of snMacs and two spatially separated snMacs: Relmα+Mgl1+ snMacs in the epineurium and Relmα–Mgl1– snMacs in the endoneurium. Globally, snMacs lack most of the core signature genes of microglia, with only the endoneurial subset expressing a restricted number of these genes. In response to nerve injury, the two resident snMac populations respond differently. Moreover, and unlike in the CNS, monocyte-derived macrophages that develop during injury can engraft efficiently in the pool of resident peripheral nervous system macrophages.
DOI: 10.1038/s41593-020-0618-6
Source: https://www.nature.com/articles/s41593-020-0618-6