Cited by 651Neuroinflammation and Neurodegeneration MechanismsAmyotrophic Lateral Sclerosis ResearchMultiple Sclerosis Research Studies

A Neurodegeneration-Specific Gene-Expression Signature of Acutely Isolated Microglia from an Amyotrophic Lateral Sclerosis Mouse Model

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Chiu, Isaac M., Morimoto, Emiko T.A., Goodarzi, Hani, Liao, Jennifer T., O’Keeffe, Sean, Phatnani, Hemali P., Muratet, Michael, Carroll, Michael C. +4 more·2013·Cell Reports

Abstract

Microglia are resident immune cells of the CNS that are activated by infection, neuronal injury, and inflammation. Here, we utilize flow cytometry and deep RNA sequencing of acutely isolated spinal cord microglia to define their activation in vivo. Analysis of resting microglia identified 29 genes that distinguish microglia from other CNS cells and peripheral macrophages/monocytes. We then analyzed molecular changes in microglia during neurodegenerative disease activation using the SOD1(G93A) mouse model of amyotrophic lateral sclerosis (ALS). We found that SOD1(G93A) microglia are not derived from infiltrating monocytes, and that both potentially neuroprotective and toxic factors, including Alzheimer's disease genes, are concurrently upregulated. Mutant microglia differed from SOD1(WT), lipopolysaccharide-activated microglia, and M1/M2 macrophages, defining an ALS-specific phenotype. Concurrent messenger RNA/fluorescence-activated cell sorting analysis revealed posttranscriptional regulation of microglia surface receptors and T cell-associated changes in the transcriptome. These results provide insights into microglia biology and establish a resource for future studies of neuroinflammation.

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Crossref · 10.1016/j.celrep.2013.06.018

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  • Gene expression patterns of microglia isolated from various inflammatory contexts do not conform to a small number of transcriptional programs and are not typically analogous to profiles induced by canonical inflammatory agents such as LPS.

    “It is now appreciated that gene expression patterns of microglia isolated from various inflammatory contexts do not conform to a small number of transcriptional programs and are not typically analogous to profiles induced by canonical inflammatory agents such as LPS (Chiu et al., 2013; Wang et al., 2015).”

    From Diverse Requirements for Microglial Survival, Specification, and Function Revealed by Defined-Medium Cultures (2017) · cites this paper as Chiu et al., 2013

    The Discussion reports that activated microglia in ALS mice have a neurodegeneration-specific expression profile distinct from LPS-activated microglia and M1/M2 macrophages. It suggests that profiles in other neurological diseases are likely to be unique, but does not establish that microglia across various inflammatory contexts are typically unlike LPS-induced profiles or cannot be grouped into a small number of programs. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • MiDM gene expression during the course of EAE did not correspond to the M1/M2 pattern of peripheral macrophage responses to infection or tissue injury.

    “MiDM gene expression during the course of EAE did not correspond to the M1/M2 pattern of peripheral macrophage responses to infection or tissue injury.”

    From Differential roles of microglia and monocytes in the inflamed central nervous system (2014) · cites this paper as Chiu et al., 2013

    The Results section ('SOD1G93A microglia differ significantly from LPS induced microglia and M1 or M2 macrophages'; page unavailable) finds that microglia in an ALS mouse model did not show an M1 or M2 bias during disease progression. This supports the general M1/M2 comparison, but the paper examines resident microglia in ALS, not MiDM gene expression during EAE. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • At EAE onset, MiDMs predominantly suppressed the distinctive gene expression pattern which correlates to their unique phenotype, reflected by the observation that MiDMs down-regulated far more genes than were up-regulated.

    “At EAE onset when SBF-SEM analyses were performed, MiDMs predominantly suppressed the distinctive gene expression pattern which correlates to their unique phenotype (Chiu et al., 2013), reflected by the observation that MiDMs down-regulated far more genes than were up-regulated (Table S1).”

    From Differential roles of microglia and monocytes in the inflamed central nervous system (2014) · cites this paper as Chiu et al., 2013

    The Results section on microglia-specific marker genes identifies a distinctive expression pattern that separates microglia from peripheral macrophages and monocytes. Chiu et al. studied an ALS mouse model, however, and do not establish that MiDMs suppress that pattern at EAE onset; the citing sentence attributes the up- versus down-regulated gene count to its own Table S1. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • There is evidence of a microglial signature in ALS SOD1G93A mice that included upregulation of some Hif1a signature genes including Tyrobp and Igf1.

    “There is evidence of a microglial signature in ALS SOD1G93A mice that included upregulation of some Hif1a signature genes including Tyrobp and Igf177”

    From Transcriptional signature in microglia associated with Aβ plaque phagocytosis (2021) · cites this paper as [77]

    The Results section, “Microglia co-express potentially neuroprotective and toxic factors in ALS mice” (page unavailable), reports upregulation of both Igf1 and Tyrobp in SOD1G93A microglia. It does not identify them as Hif1a signature genes; a search for Hif1a and hypoxia-inducible factor did not establish that link in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Olfml3 was reported recently to be a microglia-specific marker in the spinal cord.

    “Consistent with this finding, Olfml3 was reported recently to be a microglia-specific marker in the spinal cord (Chiu et al., 2013).”

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Authors
Chiu, I. M., Morimoto, E. T. A., Goodarzi, H., Liao, J. T., O’Keeffe, S., Phatnani, H. P., Muratet, M., Carroll, M. C., Levy, S., Tavazoie, S., Myers, R. M., & Maniatis, T.
Affiliations
  • Boston Children's Hospital (US)
  • Columbia University Irving Medical Center (US)
  • Rockefeller University (US)
  • HudsonAlpha Institute for Biotechnology (US)
Corresponding author
Maniatis, Tom
Venue
Cell Reports
Publisher
Elsevier BV
Published
2013-07
Volume
4
Issue
2
Pages
385-401
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2135768865
Cited by
651
References
81
Citations by year
2026: 25 · 2025: 32 · 2024: 60 · 2023: 44 · 2022: 58 · 2021: 60 · 2020: 69 · 2019: 47 · 2018: 73 · 2017: 63 · 2016: 49 · 2015: 40 · 2014: 29 · 2013: 1
FWCI
22.27
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • ALS Therapy Alliance
  • National Institutes of Health (DP1OD003930)
  • National Human Genome Research Institute (R01HG003219)
  • National Institute of Neurological Disorders and Stroke (DP1NS082099)
  • National Center for Chronic Disease Prevention and Health Promotion (5DP10D003930)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
microglia, amyotrophic lateral sclerosis, SOD1 G93A mouse model, microglial activation, gene expression signatures, resting microglia, neuroinflammation, neurodegeneration, microglial phenotype, post-transcriptional regulation, cell surface receptors, lipopolysaccharide stimulation, M1/M2 macrophages, spinal cord
MeSH terms
Amyotrophic Lateral Sclerosis, Animals, Disease Models, Animal, Female, Humans, Male, Mice, Inbred C57BL, Mice, Transgenic, Microglia, Mice, Transcriptome

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