Cited by 490Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Microglial activation and tau propagate jointly across Braak stages

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Pascoal, Tharick A., Benedet, Andrea L., Ashton, Nicholas J., Kang, Min Su, Therriault, Joseph, Chamoun, Mira, Savard, Melissa, Lussier, Firoza Z. +14 more·2021·Nature Medicine

Abstract

Compelling experimental evidence suggests that microglial activation is involved in the spread of tau tangles over the neocortex in Alzheimer's disease (AD). We tested the hypothesis that the spatial propagation of microglial activation and tau accumulation colocalize in a Braak-like pattern in the living human brain. We studied 130 individuals across the aging and AD clinical spectrum with positron emission tomography brain imaging for microglial activation ([11 C]PBR28), amyloid-β (Aβ) ([18 F]AZD4694) and tau ([18 F]MK-6240) pathologies. We further assessed microglial triggering receptor expressed on myeloid cells 2 (TREM2) cerebrospinal fluid (CSF) concentrations and brain gene expression patterns. We found that [11 C]PBR28 correlated with CSF soluble TREM2 and showed regional distribution resembling TREM2 gene expression. Network analysis revealed that microglial activation and tau correlated hierarchically with each other following Braak-like stages. Regression analysis revealed that the longitudinal tau propagation pathways depended on the baseline microglia network rather than the tau network circuits. The co-occurrence of Aβ, tau and microglia abnormalities was the strongest predictor of cognitive impairment in our study population. Our findings support a model where an interaction between Aβ and activated microglia sets the pace for tau spread across Braak stages.

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  • The activation of microglia by protein aggregates creates a feed-forward vicious cycle that aggravates neurodegeneration as activated microglia contribute to the propagation of tau, Aβ, α-synuclein, and TDP-43 into unaffected brain regions.

    “Ultimately, the activation of microglia by these protein aggregates creates a feed-forward vicious cycle that aggravates neurodegeneration as activated microglia contribute to the propagation of tau, Aβ, α-synuclein, and TDP-43 into unaffected brain regions.159–164”
  • In AD and frontotemporal dementia, neuroinflammation and microglia activation potentiate the spreading of pathological tau neurofibrillary tangles.

    “For example, in AD and frontotemporal dementia, neuroinflammation and microglia activation potentiate the spreading of pathological tau neurofibrillary tangles (83, 175).”

    From Connecting aging biology and inflammation in the omics era (2022) · cites this paper as [175]

  • Microglial activation and tau accumulation propagate spatially in parallel, following brain circuits and staging of tau pathology in the brain of AD patients.

    “In the brain of AD patients, microglial activation and tau accumulation propagate spatially in parallel, following brain circuits and staging of tau pathology [187].”

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Authors
Pascoal, T. A., Benedet, A. L., Ashton, N. J., Kang, M. S., Therriault, J., Chamoun, M., Savard, M., Lussier, F. Z., Tissot, C., Karikari, T. K., Ottoy, J., Mathotaarachchi, S., Stevenson, J., Massarweh, G., Schöll, M., de Leon, M. J., Soucy, J.-P., Edison, P., Blennow, K., Zetterberg, H., Gauthier, S., & Rosa-Neto, P.
Affiliations
  • University of Pittsburgh (US)
  • King's College London (GB)
  • Montreal Neurological Institute and Hospital (CA)
  • Centre intégré universitaire de santé et de services sociaux de l'Ouest-de-l’Île-de-Montréal (CA)
  • University of Gothenburg (SE)
  • University of Antwerp (BE)
  • UCL Queen Square Institute of Neurology (GB)
  • Hammersmith Hospital (GB)
  • Sahlgrenska University Hospital (SE)
Corresponding author
Pascoal, Tharick A.
Venue
Nature Medicine
Published
2021-08-26
Volume
27
Issue
9
Pages
1592-1599
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W3194048913
Cited by
490
References
91
Citations by year
2026: 52 · 2025: 95 · 2024: 119 · 2023: 104 · 2022: 106 · 2021: 13
FWCI
53.80
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Alzheimer’s Association (AACSF-20-648075)
  • Gouvernement du Canada | Instituts de Recherche en Santé du Canada | CIHR Skin Research Training Centre (MOP-11-51-31, PR-N)
  • Alzheimer’s Drug Discovery Foundation (RDAPB-201809-2016615)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
microglial activation, tau propagation, Braak stages, Alzheimer's disease, TREM2, amyloid-beta, [11C]PBR28, [18F]MK-6240, cognitive impairment, disease progression
MeSH terms
Adult, Aged, Aging, Alzheimer Disease, Brain, Female, Gene Expression Regulation, Humans, Male, Membrane Glycoproteins, Receptors, Immunologic, Amyloid beta-Peptides, Neurofibrillary Tangles, tau Proteins, Microglia, Positron-Emission Tomography, Cognitive Dysfunction

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