Cited by 132Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsDementia and Cognitive Impairment Research

Microglia-Mediated Neuroprotection, TREM2, and Alzheimer’s Disease: Evidence From Optical Imaging

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Condello, Carlo, Yuan, Peng, Grutzendler, Jaime·2018·Biological Psychiatry

Abstract

Recent genetic studies have provided overwhelming evidence of the involvement of microglia-related molecular networks in the pathophysiology of Alzheimer's disease (AD). However, the precise mechanisms by which microglia alter the course of AD neuropathology remain poorly understood. Here we discuss current evidence of the neuroprotective functions of microglia with a focus on optical imaging studies that have revealed a role of these cells in the encapsulation of amyloid deposits ("microglia barrier"). This barrier modulates the degree of plaque compaction, amyloid fibril surface area, and insulation from adjacent axons thereby reducing neurotoxicity. We discuss findings implicating genetic variants of the microglia receptor, triggering receptor expressed on myeloid cells 2, in the increased risk of late onset AD. We provide evidence that increased AD risk may be at least partly mediated by deficient microglia polarization toward amyloid deposits, resulting in ineffective plaque encapsulation and reduced plaque compaction, which is associated with worsened axonal pathology. Finally, we propose possible avenues for therapeutic targeting of plaque-associated microglia with the goal of enhancing the microglia barrier and potentially reducing disease progression.

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Crossref · 10.1016/j.biopsych.2017.10.007

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  • In AD brain, microglia tightly cluster and cover around Aβ plaques and protect surrounding tissues from neurotoxicity and Aβ deposits.

    “The microglia in the AD brain tightly cluster and cover around Aβ plagues and protect surrounding tissues from neurotoxicity and Aβ deposits.49, 50”

    From Acoustofluidic assembly of 3D neurospheroids to model Alzheimer's disease (2020) · cites this paper as [50]

    The Introduction says microglia cluster around Aβ deposits in AD, and “Microglia processes form a neuroprotective barrier around plaques” describes tight wrapping that may limit fibril outgrowth. That section presents protection from plaque-associated toxicity as a hypothesis supported by observations in an AD mouse model, not as established protection of surrounding tissue from Aβ deposits in all AD brains. (LLM, conf=0.83)

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  1. [11]Mintun MA Larossa GN Sheline YI Dence CS Lee SY Mach RH 2006 [11c]pib in a nondemented population: potential antecedent marker of alzheimer disease Neurology 67 3 446 452 16894106
  2. [86]Nicoll JAR Barton E Boche D Neal JW Ferrer I Thompson P 2006 Abeta species removal after abeta42 immunization J Neuropathol Exp Neurol 65 11 1040 1048 17086100
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  4. [129]Niess JH Brand S Gu X Landsman L Jung S McCormick BA 2005 Cx3cr1-mediated dendritic cell access to the intestinal lumen and bacterial clearance Science 307 5707 254 258 15653504
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Authors
Condello, C., Yuan, P., & Grutzendler, J.
Affiliations
  • University of California, San Francisco (US)
  • Stanford University (US)
  • Yale University (US)
Corresponding author
Grutzendler, Jaime
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2018-02
Volume
83
Issue
4
Pages
377-387
ISSN
0006-3223 (ISSN-L)
OpenAlex
W2764165275
Cited by
131
References
155
Citations by year
2026: 12 · 2025: 18 · 2024: 17 · 2023: 10 · 2022: 17 · 2021: 19 · 2020: 10 · 2019: 17 · 2018: 11
FWCI
1.00
Type
journal article
Language
en
Open access
Locations
  • Biological Psychiatry (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-nd)
Funders
  • National Institutes of Health (5r01hl106815-06)
  • National Institute on Aging (R21AG048181, R01AG027855, RF1AG058257, P50AG047270)
  • National Heart, Lung, and Blood Institute (R01-HL106815)
  • National Institute of Neurological Disorders and Stroke (R01NS089734)
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
microglia, neuroprotection, TREM2, Alzheimer's disease, amyloid plaques, amyloid fibrils, axonal pathology, microglial polarization, microglia-targeted therapy, optical imaging
MeSH terms
Neuroprotection, Alzheimer Disease, Animals, Humans, Membrane Glycoproteins, Receptors, Immunologic, Microglia, Optical Imaging

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