Cited by 1,804Neuroinflammation and Neurodegeneration MechanismsNeurogenesis and neuroplasticity mechanismsMultiple Sclerosis Research Studies

New tools for studying microglia in the mouse and human CNS

Open access
Bennett, Mariko L., Bennett, F. Chris, Liddelow, Shane A., Ajami, Bahareh, Zamanian, Jennifer L., Fernhoff, Nathaniel B., Mulinyawe, Sara B., Bohlen, Christopher J. +8 more·2016·Proceedings of the National Academy of Sciences

Abstract

Significance: Microglia are the tissue resident macrophages of the brain and spinal cord, implicated in important developmental, homeostatic, and disease processes, although our understanding of their roles is complicated by an inability to distinguish microglia from related cell types. Although they share many features with other macrophages, microglia have distinct developmental origins and functions. Here we validate a stable and robustly expressed microglial marker for both mouse and human, transmembrane protein 119 (Tmem119). We use custom-made antibodies against Tmem119 to perform deep RNA sequencing of developing microglia, and demonstrate that microglia mature by the second postnatal week in mice. The antibodies, cell isolation methods, and RNAseq profiles presented here will greatly facilitate our understanding of microglial function in health and disease.

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Crossref · 10.1073/pnas.1525528113

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  • TMEM119 and P2RY12 have been shown to be expressed solely by microglial cells and not by infiltrating macrophages.

    “TMEM119 and P2RY12 are especially useful, since they have been shown to be expressed solely by microglial cells and not by infiltrating macrophages [41,42,43].”

    From Beyond Activation: Characterizing Microglial Functional Phenotypes (2021) · cites this paper as [41]

    In “Macrophages After CNS Inflammation and Injury” (page not available), the paper reports that Tmem119 labels resident microglia but not infiltrating macrophages. It lists P2ry12 as a microglia-enriched candidate in “Tmem119 mRNA Expression Is Highly Enriched” (page not available), but does not establish that P2ry12 is expressed solely by microglia or absent from infiltrating macrophages. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The upregulation of inflammatory genes in microglia is not observed with a mechanical dissociation at 4°C.

    “The phenomenon was not observed with a mechanical dissociation at 4°C (Bennett et al., 2016).”

    From Single-cell resolution analysis of the crosstalk between chemogenically activated astrocytes and microglia (2020) · cites this paper as Bennett et al., 2016

    The section on Tmem119-purified microglia describes mechanical brain homogenization, and “RNAseq Profiles Quality and Purity” reports significantly lower expression of inflammatory activation markers than in published profiles. It concludes that the procedure limits activation, not that inflammatory-gene upregulation is absent; our copy also does not specify dissociation at 4°C. Page numbers are unavailable in the indexed passages. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Enzymatic dissociation of brain tissue at 37°C results in an upregulation of inflammatory genes in microglia.

    “Research has also shown that the enzymatic dissociation of brain tissue at 37°C results in an upregulation of inflammatory genes in microglia.”

    From Single-cell resolution analysis of the crosstalk between chemogenically activated astrocytes and microglia (2020) · cites this paper as Bennett et al., 2016

    The section “RNAseq Profiles Quality and Purity: Lower Expression of Activation Marker Genes” reports lower expression of inflammatory activation markers in microglia isolated by the authors’ procedure than in published datasets that used enzymatic digestion or Percoll. It does not specify 37°C or establish that enzymatic dissociation itself caused the higher expression; the procedures differed in other ways too. The “Other Analyses: Microglial Activation” section attributes inflammatory-gene upregulation to LPS, not dissociation. Page numbers are unavailable in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Il-1α, TNFα, and C1q are highly expressed specifically by microglia.

    “All three of these cytokines are highly expressed specifically by microglia13,15, again suggesting a critical role for microglia in inducing A1 reactive astrocytes.”

    From Neurotoxic reactive astrocytes are induced by activated microglia (2017) · cites this paper as [15]

    In “Tmem119 mRNA Expression Is Highly Enriched in the CNS and Specific,” Il1a is listed among highly expressed microglia-enriched candidates. The RNA-seq section reports much higher C1q gene expression in microglia than in other myeloid cells, but also identifies C1q-positive macrophages. The activation section reports Tnf upregulation after LPS, not that TNFα is highly expressed specifically by microglia. No page numbers are supplied for these passages. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • TMEM119 is stably and specifically expressed in microglia and can be used to distinguish microglia from resident and infiltrating macrophages.

    “TMEM119 has been shown to be stably and specifically expressed in microglia [41,44], and it can be used to distinguish microglia from resident and infiltrating macrophages [41].”

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Cites

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Research works printed but not linked: 3

  1. Frank M, Wolburg H (1996) Cellular reactions at the lesion site after crushing of the rat optic nerve. Glia 16(3):227-240.
  2. Tremblay ME, et al. (2011) The role of microglia in the healthy brain. J Neurosci 31(45):16064-16069.
  3. Wilson JM, Young AB, Young AB, Kelley WN (1983) Hypoxanthine-guanine phos- phoribosyltransferase deficiency. The molecular basis of the clinical syndromes. N Engl J Med 309(15):900-910.

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Authors
Bennett, M. L., Bennett, F. C., Liddelow, S. A., Ajami, B., Zamanian, J. L., Fernhoff, N. B., Mulinyawe, S. B., Bohlen, C. J., Adil, A., Tucker, A., Weissman, I. L., Chang, E. F., Li, G., Grant, G. A., Hayden Gephart, M. G., & Barres, B. A.
Affiliations
  • Stanford Medicine (US)
  • The University of Melbourne (AU)
  • University of California, San Francisco (US)
  • Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305
Venue
Proceedings of the National Academy of Sciences
Published
2016-02-16
Volume
113
Issue
12
Pages
E1738-46
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2280077905
Cited by
1,804
References
58
Citations by year
2026: 98 · 2025: 122 · 2024: 175 · 2023: 184 · 2022: 241 · 2021: 251 · 2020: 228 · 2019: 189 · 2018: 174 · 2017: 110 · 2016: 30 · 2015: 1
FWCI
91.86
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • HHS | NIH | National Institute of Child Health and Human Development (F31NS078813, R21HD075359)
  • HHS | NIH | National Institute of Neurological Disorders and Stroke (R47DA15043, 5K08NS075144-05)
  • HHS | NIH | National Institute of Mental Health (5T32MH019938-22)
  • HHS | NIH | National Cancer Institute (F32HL115973-02)
  • Department of Health, Australian Government | National Health and Medical Research Council (GNT1052961)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
microglia, TMEM119, monoclonal antibodies, microglia isolation, microglial development, postnatal maturation, microglial transcriptome, central nervous system injury, brain development, myeloid cells, neuroinflammation
MeSH terms
Aged, Animals, Antibodies, Monoclonal, Brain, Cell Division, Child, Humans, Lipopolysaccharides, Macrophages, Membrane Proteins, Middle Aged, Nerve Crush, Nerve Tissue Proteins, Organ Specificity, Rabbits, Sciatic Nerve, Temporal Lobe, Biomarkers, Sequence Analysis, RNA, Microglia, Mice, Knockout, Gene Expression Regulation, Developmental, Cell Lineage, Endotoxemia, Optic Nerve Injuries, Gene Expression Profiling, Mice, Transcriptome

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