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To determine the impact of microglia on disease development and progression in neurodegenerative and neuroinflammatory diseases, it is essential to distinguish microglia from peripheral macrophages\/monocytes, which are eventually equally recruited. It has been suggested that transmembrane protein 119 (TMEM119) serves as a reliable microglia marker that discriminates resident microglia from blood\u2010derived macrophages in the human and murine brain. Here, we investigated the validity of TMEM119 as a microglia marker in four in vivo models (cuprizone intoxication, experimental autoimmune encephalomyelitis (EAE), permanent filament middle cerebral artery occlusion (fMCAo), and intracerebral 6\u2010hydroxydopamine (6\u2010OHDA) injections) as well as post mortem multiple sclerosis (MS) brain tissues. In all applied animal models and post mortem MS tissues, we found increased densities of ionized calcium\u2010binding adapter molecule 1<jats:sup>+<\/jats:sup> (IBA1<jats:sup>+<\/jats:sup>) cells, paralleled by a significant decrease in TMEM119 expression. In addition, other cell types in peripheral tissues (<jats:italic>i.e<\/jats:italic>., follicular dendritic cells and brown adipose tissue) were also found to express TMEM119. In summary, this study demonstrates that TMEM119 is not exclusively expressed by microglia nor does it label all microglia, especially under cellular stress conditions. Since novel transgenic lines have been developed to label microglia using the TMEM119 promotor, downregulation of TMEM119 expression might interfere with the results and should, thus, be considered when working with these transgenic mouse models.<\/jats:p>","DOI":"10.1002\/glia.24164","type":"journal-article","created":{"date-parts":[[2022,3,5]],"date-time":"2022-03-05T07:18:52Z","timestamp":1646464732000},"page":"1170-1190","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":77,"title":["Transmembrane protein 119 is neither a specific nor a reliable marker for microglia"],"prefix":"10.1002","volume":"70","author":[{"given":"Elise","family":"Vankriekelsvenne","sequence":"first","affiliation":[{"name":"Rostock University Medical Center Institute of Anatomy  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uta","family":"Chrzanowski","sequence":"additional","affiliation":[{"name":"Rostock University 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