Cited by 443Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsDementia and Cognitive Impairment Research

Distinct amyloid-β and tau-associated microglia profiles in Alzheimer’s disease

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Gerrits, Emma, Brouwer, Nieske, Kooistra, Susanne M., Woodbury, Maya E., Vermeiren, Yannick, Lambourne, Mirjam, Mulder, Jan, Kummer, Markus +6 more·2021·Acta Neuropathologica

Abstract

Alzheimer’s disease (AD) is the most prevalent form of dementia and is characterized by abnormal extracellular aggregates of amyloid-β and intraneuronal hyperphosphorylated tau tangles and neuropil threads. Microglia, the tissue-resident macrophages of the central nervous system (CNS), are important for CNS homeostasis and implicated in AD pathology. In amyloid mouse models, a phagocytic/activated microglia phenotype has been identified. How increasing levels of amyloid-β and tau pathology affect human microglia transcriptional profiles is unknown. Here, we performed snRNAseq on 482,472 nuclei from non-demented control brains and AD brains containing only amyloid-β plaques or both amyloid-β plaques and tau pathology. Within the microglia population, distinct expression profiles were identified of which two were AD pathology-associated. The phagocytic/activated AD1-microglia population abundance strongly correlated with tissue amyloid-β load and localized to amyloid-β plaques. The AD2-microglia abundance strongly correlated with tissue phospho-tau load and these microglia were more abundant in samples with overt tau pathology. This full characterization of human disease-associated microglia phenotypes provides new insights in the pathophysiological role of microglia in AD and offers new targets for microglia-state-specific therapeutic strategies.

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Crossref · 10.1007/s00401-021-02263-w

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  • AD1 cluster closely reassembled mouse DAM/MGnD phenotype and was only abundant in human samples containing Aβ and not tau.

    “a population of clusters, namely AD1, closely reassembled the mouse DAM/MGnD phenotype, it was only abundant in human samples containing Aβ and not tau”

    From Microglia and monocytes in inflammatory CNS disease: integrating phenotype and function (2022) · cites this paper as [119]

    The Results section reports that AD1 microglia resemble the phagocytic/activated DAM profile seen in amyloid mouse models. It finds a strong correlation between AD1 abundance and amyloid-β load only in samples without detectable tau pathology, but it does not say AD1 is abundant only in those samples: AD1 microglia were also present, at a lower proportion, in samples with both pathologies. The claim turns a conditional correlation into an exclusive presence claim. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • There exist other microglial subsets in AD besides DAM/MGnD; human microglia are heterogeneous, limiting translation of DAM signature from animal models.

    “Together this work demonstrates, firstly, that there exist other microglial subsets in AD besides the DAM/MGnD phenotype, and secondly, that human microglia are heterogenous, thus limiting the translation of the DAM signature from animal models.”

    From Microglia and monocytes in inflammatory CNS disease: integrating phenotype and function (2022) · cites this paper as [119]

    The Discussion (page unavailable) identifies two distinct human AD-associated microglial profiles: AD1 resembles the phagocytic/activated profile in amyloid mouse models, while AD2 is a different, tau-associated profile. This supports the existence of human microglial subsets beyond DAM/MGnD, but the paper does not establish that heterogeneity limits translation of the DAM signature from animal models; it reports a similarity between mouse and human AD1 microglia. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Two recent reports suggest the presence of B cells in the brains of patients with AD.

    “These findings were not formally published, however two recent reports suggest the presence of B cells in the brains of patients with AD [81,82].”

    From Is there a role for B cells in Alzheimer's disease? (2026) · cites this paper as [82]

    The Results section ('Enrichment of less abundant CNS cell types by depletion of neurons and oligodendrocytes/OPCs'; page unavailable) identifies a lymphocyte cluster in brain samples that included AD donors. The paper does not explicitly identify those lymphocytes as B cells, so it supports the presence of lymphocytes in AD brains but not the claim’s more specific cell type. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • A study using single-nucleus RNA sequencing identified a cluster of lymphocytes in AD brains enriched for expression of IL-7R and MS4A1 genes, encoding IL-7 receptor and CD20, both established markers of B lymphocytes.

    “A study using singlenucleus RNA sequencing identified a cluster of lymphocytes in AD brains enriched for the expression of IL-7R and MS4A1 genes, which encode the interleukin-7 receptor and CD20 respectively, both estab­ lished markers of B lymphocytes [82].”

    From Is there a role for B cells in Alzheimer's disease? (2026) · cites this paper as [82]

    The Results section on enrichment of less abundant CNS cell types reports that single-nucleus RNA sequencing identified a lymphocyte cluster enriched for IL7R and MS4A1 expression in samples that included AD brains. Our copy does not state that these genes encode the named proteins or that both are established B-lymphocyte markers. It also says the clusters were present in all samples, not only AD samples. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • There was considerable overlap between the Micro_D profile and previously reported microglial states, such as MIMS-foamy, amyloid-associated microglia in Alzheimer's disease and lipid-associated macrophages in obesity.

    “There was considerable overlap between the Micro_D profile and previously reported microglial states, such as the MIMS-foamy state reported in ref. 11, amyloid-associated microglia in Alzheimer’s disease43,46,47 and lipid-associated macrophages (LAMs) in obesity48 (Extended Data Fig. 8).”

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Authors
Gerrits, E., Brouwer, N., Kooistra, S. M., Woodbury, M. E., Vermeiren, Y., Lambourne, M., Mulder, J., Kummer, M., Möller, T., Biber, K., Dunnen, W. F. A. D., De Deyn, P. P., Eggen, B. J. L., & Boddeke, E. W. G. M.
Affiliations
  • University Medical Center Groningen (NL)
  • AbbVie (United States) (US)
  • Karolinska Institutet (SE)
  • AbbVie (Germany) (DE)
  • University of Copenhagen (DK)
Corresponding author
Boddeke, Erik W. G. M.
Venue
Acta Neuropathologica
Published
2021-02-20
Volume
141
Issue
5
Pages
681-696
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W3129453843
Cited by
441
References
42
Citations by year
2026: 69 · 2025: 80 · 2024: 124 · 2023: 53 · 2022: 87 · 2021: 27 · 2012: 1
FWCI
30.05
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, cc-by)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion, cc-by)
  • Socio-Environmental Systems Modeling (acceptedVersion, cc-by)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
  • Data Archiving and Networked Services (DANS) (submittedVersion, cc-by)
Funders
  • Rijksuniversiteit Groningen
  • Stichting MS Research
  • Fonds Wetenschappelijk Onderzoek (12Z1620N)
  • Universitair Medisch Centrum Groningen
  • Vlaamse Instelling voor Technologisch Onderzoek
  • Alzheimer Nederland
  • Vlaamse regering
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, microglia, amyloid plaques, tau pathology, microglial activation, microglial phenotype, single-nucleus RNA sequencing, phosphorylated tau, disease-associated microglia, microglia-targeted therapy
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Brain, Female, Humans, Male, Amyloid beta-Peptides, tau Proteins, Microglia

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