Cited by 740Neuroinflammation and Neurodegeneration MechanismsSingle-cell and spatial transcriptomicsAlzheimer's disease research and treatments

Temporal Tracking of Microglia Activation in Neurodegeneration at Single-Cell Resolution

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Mathys, Hansruedi, Adaikkan, Chinnakkaruppan, Gao, Fan, Young, Jennie Z., Manet, Elodie, Hemberg, Martin, De Jager, Philip L., Ransohoff, Richard M. +2 more·2017·Cell Reports

Abstract

Microglia, the tissue-resident macrophages in the brain, are damage sensors that react to nearly any perturbation, including neurodegenerative diseases such as Alzheimer's disease (AD). Here, using single-cell RNA sequencing, we determined the transcriptome of more than 1,600 individual microglia cells isolated from the hippocampus of a mouse model of severe neurodegeneration with AD-like phenotypes and of control mice at multiple time points during progression of neurodegeneration. In this neurodegeneration model, we discovered two molecularly distinct reactive microglia phenotypes that are typified by modules of co-regulated type I and type II interferon response genes, respectively. Furthermore, our work identified previously unobserved heterogeneity in the response of microglia to neurodegeneration, discovered disease stage-specific microglia cell states, revealed the trajectory of cellular reprogramming of microglia in response to neurodegeneration, and uncovered the underlying transcriptional programs.

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Crossref · 10.1016/j.celrep.2017.09.039

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  • Microglial activation can help clear pathogenic molecules from the brain but can also lead to chronic or excessive inflammation that exacerbates neurodegeneration.

    “While microglial activation can help clear pathogenic molecules from the brain, it can also lead to chronic or excessive inflammation that exacerbates neurodegeneration (Mathys et al., 2017).”

    From A novel molecular class that recruits HDAC/MECP2 complexes to PU.1 motifs reduces neuroinflammation (2023) · cites this paper as Mathys et al., 2017

    The Introduction says microglia clear apoptotic cells, but it does not say they clear pathogenic molecules. The Discussion reports increased pro-inflammatory cytokines in responding microglia and suggests they may contribute to a cascade leading to neuronal death; it does not establish that chronic or excessive inflammation exacerbates neurodegeneration. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Apparent PLCG2 transcript upregulation in bulk cortical tissue is mostly related to microgliosis occurring as a consequence of neurodegeneration.

    “However, normalization to microglia-specific genes (e.g., Abi3) and data from single-cell profiling of brain immune cells [6, 36, 37], suggest that apparent PLCG2 transcript upregulation in bulk tissue is mostly related to microgliosis occurring as a consequence of neurodegeneration.”

    From Alzheimer’s disease phospholipase C-gamma-2 (PLCG2) protective variant is a functional hypermorph (2019) · cites this paper as [37]

    The Results section on microglial proliferation reports increased microglial density in the hippocampus of neurodegenerating CK-p25 mice. The Discussion also says that increased immune-related transcripts in tissue could reflect either changes in microglial expression or expansion of the microglial population, and finds evidence for both. Our copy does not establish that bulk-tissue PLCG2 upregulation is mostly due to microgliosis; searches for PLCG2 and Abi3 found no passage addressing that specific inference. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • These aggregated forms play leading roles in driving main pathogenic events in these neurodegenerative diseases with the active involvement of highly activated microglia, more recently referred to as disease-associated microglia.

    “In fact, these aggregated forms play leading roles in driving main pathogenic events in these neurodegenerative diseases with the active involvement of highly activated microglia, more recently referred to as disease-associated microglia (Krasemann et al., 2017) (Keren-Shaul et al., 2017) (Mathys et al., 2017).”

    From TET2 Regulates the Neuroinflammatory Response in Microglia (2019) · cites this paper as Mathys et al., 2017

    The Introduction describes microglia responding to Aβ plaques, and the Discussion (‘Two Distinct Reactive Microglia Phenotypes in Neurodegeneration’; page unavailable) reports that the authors’ late-response microglia resemble disease-associated microglia. The paper does not establish that aggregated forms drive the main pathogenic events in these diseases, and it says whether the DAM-like response is protective, neutral, or harmful remains unknown. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • In longer-term neurodegenerative models, such as AD, distinct temporal microglial activation states emerge.

    “In longer-term neurodegenerative models, such as AD, distinct temporal microglial activation states emerge61.”
  • An effect of TET2 in cell cycle regulation cannot be discarded in response to proinflammatory challenge, in line with RNA-seq data.

    “A typical early feature of activated microglia is cell proliferation (Mathys et al., 2017), hence an effect of TET2 in cell cycle regulation cannot be discarded in response to proinflammatory challenge in line with our RNA-seq data.”

    From TET2 Regulates the Neuroinflammatory Response in Microglia (2019) · cites this paper as Mathys et al., 2017

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Authors
Mathys, H., Adaikkan, C., Gao, F., Young, J. Z., Manet, E., Hemberg, M., De Jager, P. L., Ransohoff, R. M., Regev, A., & Tsai, L.-H.
Affiliations
  • Massachusetts Institute of Technology (US)
  • Wellcome Sanger Institute (GB)
  • Biogen (United States) (US)
  • Broad Institute (US)
Corresponding author
Tsai, Li-Huei
Venue
Cell Reports
Publisher
Elsevier BV
Published
2017-10
Volume
21
Issue
2
Pages
366-380
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2761726094
Cited by
740
References
38
Citations by year
2026: 40 · 2025: 68 · 2024: 100 · 2023: 93 · 2022: 107 · 2021: 106 · 2020: 101 · 2019: 76 · 2018: 47 · 2012: 1
FWCI
30.51
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (acceptedVersion, cc-by-nc-nd)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • Elsevier eBooks
Funders
  • JBP Foundation
  • NIH (RF1 AG054321)
  • Swiss National Science Foundation (P2BSP3_151885)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
microglial activation, neurodegeneration, Alzheimer's disease, hippocampus, microglial transcriptome, microglial heterogeneity, type I interferon response, microglial reprogramming
MeSH terms
Alzheimer Disease, Animals, Brain, Cells, Cultured, Interferon Type I, Interferon-gamma, Macrophage Activation, Macrophages, Phenotype, Microglia, Gene Expression Profiling, Mice, Single-Cell Analysis, Transcriptome

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