Cited by 64Neuroinflammation and Neurodegeneration MechanismsSingle-cell and spatial transcriptomicsMultiple Sclerosis Research Studies

Microglia recapitulate a hematopoietic master regulator network in the aging human frontal cortex

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Wehrspaun, Claudia C., Haerty, Wilfried, Ponting, Chris P.·2015·Neurobiology of Aging

Abstract

Microglia form the immune system of the brain. Previous studies in cell cultures and animal models suggest altered activation states and cellular senescence in the aged brain. Instead, we analyzed 3 transcriptome data sets from the postmortem frontal cortex of 381 control individuals to show that microglia gene markers assemble into a transcriptional module in a gene coexpression network. These markers predominantly represented M1 and M1/M2b activation phenotypes. Expression of genes in this module generally declines over the adult life span. This decrease was more pronounced in microglia surface receptors for microglia and/or neuron crosstalk than in markers for activation state phenotypes. In addition to these receptors for exogenous signals, microglia are controlled by brain-expressed regulatory factors. We identified a subnetwork of transcription factors, including RUNX1, IRF8, PU.1, and TAL1, which are master regulators (MRs) for the age-dependent microglia module. The causal contributions of these MRs on the microglia module were verified using publicly available ChIP-Seq data. Interactions of these key MRs were preserved in a protein-protein interaction network. Importantly, these MRs appear to be essential for regulating microglia homeostasis in the adult human frontal cortex in addition to their crucial roles in hematopoiesis and myeloid cell-fate decisions during embryogenesis.

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Crossref · 10.1016/j.neurobiolaging.2015.04.008

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  • This highlights age-dependent change in microglial plasticity.

    “highlighting the age-dependent change in microglial plasticity [53, 55].”
  • During maturation and aging, pro-inflammatory gene expression increases in adult microglia.

    “With maturation and aging, expression of pro-inflammatory genes in adult microglia increase, suggesting their reactive state and reduced plasticity in the adult stage possibly due to repetitive exposure to infectious agents and active removal of cell debris [53, 55].”
  • Wehrspaun et al. analyzed three transcriptome datasets from postmortem human cortical tissue spanning teens to elderly and found microglial markers assembled into a gene co-expression network regulated by an age-dependent transcriptional module consisting of RUNX1, IRF8, SPI1, and TAL1.

    “Interestingly, Wehrspaun et al. analyzed three transcriptome data sets from postmortem human cortical tissue spanning teens to elderly, and found microglial markers to be assembled into a gene co-expression network regulated by an age-dependent transcriptional module consisting of RUNX1, IRF8, SPI1, and TAL1 [53].”
  • This suggests a reactive state and reduced plasticity in adult microglia, possibly due to repeated infections and debris clearance.

    “suggesting their reactive state and reduced plasticity in the adult stage possibly due to repetitive exposure to infectious agents and active removal of cell debris [53, 55].”
  • Transcriptome analysis of aged human microglia reveals specific genes influenced by aging.

    “Transcriptome analysis of aged human microglia reveal specific genes influenced by aging [52-54].”

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Authors
Wehrspaun, C. C., Haerty, W., & Ponting, C. P.
Affiliations
  • National Institutes of Health (US)
  • University of Oxford (GB)
Corresponding author
Wehrspaun, Claudia C.
Venue
Neurobiology of Aging
Publisher
Elsevier BV
Published
2015-08
Volume
36
Issue
8
Pages
2443.e9-2443.e20
ISSN
0197-4580 (ISSN-L)
OpenAlex
W2001285655
Cited by
64
References
94
Citations by year
2026: 9 · 2025: 8 · 2024: 2 · 2023: 6 · 2022: 5 · 2021: 7 · 2020: 8 · 2019: 4 · 2018: 6 · 2017: 4 · 2016: 4 · 2015: 1
FWCI
2.62
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Aging (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UEA Digital Repository (University of East Anglia) (submittedVersion)
Funders
  • Wellcome Trust
  • NIMH
  • MRC
  • ERC
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 › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
microglia, brain aging, frontal cortex, master regulators, transcriptional modules, gene co-expression network, RUNX1, IRF8, PU.1, TAL1, microglial homeostasis, hematopoietic regulation, protein-protein interaction network
MeSH terms
T-Cell Acute Lymphocytic Leukemia Protein 1, Interferon Regulatory Factor-8, Proto-Oncogene Protein Spi-1, Aging, Animals, Frontal Lobe, Hematopoiesis, Homeostasis, Humans, Neurons, Proto-Oncogene Proteins, Receptors, Cell Surface, Transcription Factors, Trans-Activators, Microglia, Core Binding Factor Alpha 2 Subunit, Interferon Regulatory Factors, Basic Helix-Loop-Helix Proteins, Transcriptome, Protein Interaction Maps, Datasets as Topic

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