Cited by 928Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

Microglia in Alzheimer's disease

Open access
Sarlus, Heela, Heneka, Michael T.·2017·Journal of Clinical Investigation

Abstract

Microglia are brain-resident myeloid cells that mediate key functions to support the CNS. Microglia express a wide range of receptors that act as molecular sensors, which recognize exogenous or endogenous CNS insults and initiate an immune response. In addition to their classical immune cell function, microglia act as guardians of the brain by promoting phagocytic clearance and providing trophic support to ensure tissue repair and maintain cerebral homeostasis. Conditions associated with loss of homeostasis or tissue changes induce several dynamic microglial processes, including changes of cellular morphology, surface phenotype, secretory mediators, and proliferative responses (referred to as an "activated state"). Activated microglia represent a common pathological feature of several neurodegenerative diseases, including Alzheimer's disease (AD). Cumulative evidence suggests that microglial inflammatory activity in AD is increased while microglial-mediated clearance mechanisms are compromised. Microglia are perpetually engaged in a mutual interaction with the surrounding environment in CNS; thus, diverse microglial reactions at different disease stages may open new avenues for therapeutic intervention and modification of inflammatory activities. In this Review, the role of microglia in the pathogenesis of AD and the modulation of microglia activity as a therapeutic modality will be discussed.

Integrity signals

Registry

Crossref · 10.1172/jci90606

Cites

161 of 161 references verified0 citation errors · 0 not checkable

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Claims the paper makes

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  • Premisecitation

    PRRs bind different species of amyloid-beta with varying affinities.

    “PRRs bind to different species of Aβ with various affinities (71).”
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    Microglial-derived immune factors can induce an A1 astrocyte phenotype that contributes to neuronal death through reduced trophic support, impaired clearance, and release of toxins.

    “Microglial-derived immune factors can induce a so-called A1 astrocyte phenotype that contributes to neuronal death through reduced trophic support, impaired clearance capacity, and release of toxins (69).”
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    • cites [69] source

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    Activated microglia, immunoglobulins, and complement components are closely associated with amyloid-beta deposits in Alzheimer's disease patients and mouse models.

    “Activated microglia along with immunoglobulins and complement components are closely associated with Aβ deposits in brains from AD patients and AD mouse models (58)(59)(60)(61)(62).”
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    • cites [59] Frautschy, 1998, Microglial response to amyloid plaques in APPsw transgenic mice, Am J Pathol

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    Microglia are implicated in spreading tau aggregates through endocytosis and exocytosis in a nonsynaptic transmission pathway.

    “microglia also were implicated in spreading tau aggregates through endocytosis (via phagocytosis) and exocytosis (via exosomes) in a nonsynaptic transmission pathway (68).”
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    Amyloid-beta-mediated release of proinflammatory factors and neurotoxicity partially involves signaling through the CD36/TLR4/TLR6 complex.

    “Stewart and colleagues demonstrated that Aβ-mediated release of proinflammatory factors and neurotoxicity partially involved signaling through the CD36/ TLR4/TRL6 complex (108).”
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    Increased expression of Tlr2, Tlr4, Tlr5, Tlr7, and Tlr9 mRNAs is found in amyloid-beta plaques, and Tlr2/5 expression is elevated in plaque-associated tissue compared with plaque-free tissue.

    “Increased expression of Tlr2, Tlr4, Tlr5, Tlr7, and Tlr9 mRNAs was found in Aβ plaques, and expression of Tlr2/5 was elevated in plaque-associated tissue in comparison with plaquefree tissue (107)”
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    Depletion of microglia suppresses tau propagation, suggesting that microglia actively contribute to tau pathology during Alzheimer's disease pathogenesis.

    “Depletion of microglia suppressed tau propagation (68), suggesting that microglia actively contribute to tau pathology during AD pathogenesis.”
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    Interpretationreasoning

    Microglial activation in Alzheimer's disease pathogenesis may have a dual role: acute activation decreases amyloid-beta accumulation, while chronic activation contributes to neurotoxicity and synapse loss.

    “In AD pathogenesis, microglia activation may play a dual role: on one side, acute microglial activation in some experimental paradigms leads to decreased Aβ accumulation by increasing phagocytosis or clearance.”
    • Also stated in: § Alzheimer's disease · plain
      “chronic activation of microglia contributes to neurotoxicity and synapse loss by triggering several proinflammatory cascades.”
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    Activated microglia in Alzheimer's disease show increased proliferation and increased expression of inflammatory markers such as CD36, CD14, CD11c, MHC-II, and iNOS.

    “activated microglia in AD show increased proliferation (63,64) and increased expression of inflammatory markers such as CD36, CD14, CD11c, MHC-II, and iNOS (65,66)”
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    • cites [64] Olmos-Alonso, 2016, Pharmacological targeting of CSF1R inhibits microglial proliferation and prevents the progression of Alzheimer’s-like pathology, Brain source

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    • cites [65] Kamphuis, 2016, Transcriptional profiling of CD11c-positive microglia accumulating around amyloid plaques in a mouse model for Alzheimer’s disease, Biochim Biophys Acta source

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    In vivo imaging shows that microglial activation precedes the onset of Alzheimer's disease and is paralleled by increased levels of inflammatory markers in cerebrospinal fluid.

    “In vivo imaging shows that microglia activation precedes the onset of AD (100) and is paralleled by increased levels of inflammatory markers in the cerebrospinal fluid (101)”
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    • cites [100] Hamelin, 2016, Early and protective microglial activation in Alzheimer’s disease: a prospective study using 18F-DPA-714 PET imaging, Brain source

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    The COX-1 inhibitor naproxen is beneficial only in fast decliners, whereas the selective COX-2 inhibitor celecoxib is beneficial in slow decliners but harmful in the fast-progressing group.

    “the COX-1 inhibitor naproxen was beneficial in fast decliners only; in contrast, the selective COX-2 inhibitor celecoxib was beneficial in slow decliners but harmful in the fast-progressing group.”
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    Repeated monthly injections of CpG-ODNs for TLR9 stimulation reduce amyloid deposition and cerebral amyloid angiopathy and prevent cognitive deficits in mice.

    “repeated monthly injections of CpG-ODNs reduced amyloid deposition and cerebral amyloid angiopathy, and prevented cognitive deficits.”
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    Interpretationcitation

    CD14 deletion shifts microglial activation toward an immunomodulatory state, possibly by blocking TLR2 signaling that contributes to inflammation and Alzheimer's disease pathology.

    “These findings suggested that CD14 deletion shifts microglia activation to an immunomodulatory state, possibly by blocking TLR2 signaling, which contributes to inflammation and AD pathology (115).”
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    TLR9 stimulation decreases tau-related pathology, in contrast to TLR4 stimulation.

    “In contrast to TLR4 stimulation, TLR9 stimulation decreased tau-related pathology (116).”
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    COX-2 expression peaks in neurons during Braak phases 0-II, probably representing an adaptive response that subsequently declines.

    “COX-2 expression peaks in neurons in Braak phases 0-II (an early stage characterized by neurofibrillary changes beginning at transentorhinal regions), probably representing an adaptive response that subsequently declines (105).”
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    In Alzheimer's disease patients, microglial activation correlates with glucose hypometabolism, suggesting a link between microglial activation and synaptic dysfunction.

    “microglial activation correlated with glucose hypometabolism in AD patients (103), suggesting a link between microglial activation and synaptic dysfunction.”
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    • cites [103] Fan, 2015, Longitudinal influence of microglial activation and amyloid on neuronal function in Alzheimer’s disease, Brain source

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    Interpretationreasoning

    TLR9 stimulation activates an innate immune response that benefits Alzheimer's disease pathology without provoking inflammation.

    “Hence, it seems that TLR9 stimulation activates an innate immune response that benefits AD pathology without provoking inflammation.”
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    APP/PS1dE9 mice lacking functional TLR4 show increased amyloid-beta load, decreased IL-1β, CCL3, and CCL4 expression, and decreased cognitive function, suggesting a protective role for TLR4 in amyloid clearance.

    “APP/PS1dE9 mice lacking functional TRL4 showed an increase in Aβ load associated with decreased expression of IL-1β, CCL3, and CCL4 and decreased cognitive function (110), suggesting a protective role of TRL4 in amyloid clearance.”
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    • cites [110] Song, 2011, TLR4 mutation reduces microglial activation, increases Aβ deposits and exacerbates cognitive deficits in a mouse model of Alzheimer’s disease, J Neuroinflammation source

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    Inhibition of different complement components impairs amyloid-beta phagocytosis and results in elevated synapse loss.

    “other studies have reported that inhibition of different components of complement impaired Aβ phagocytosis, resulting in elevated synapse loss.”
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    Inhibition of microglial C3aR reduces microglial activation and augments amyloid-beta clearance, suggesting a detrimental role for complement.

    “Inhibition of microglial C3aR reduced microglial activation and augmented Aβ clearance in the brain (125), suggesting a detrimental role for complement.”
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    In the clinical phase of Alzheimer's disease, a strong association between microglial activation and AD pathology is observed in young patients, but activation wanes in patients older than 80 years.

    “in the clinical phase of AD, the strong association between microglial activation and AD pathology was observed in young AD patients, but activation waned in AD patients older than 80 years (106)”
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    • cites [106] Hoozemans, 2011, Neuroinflammation in Alzheimer’s disease wanes with age, J Neuroinflammation source

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    Amyloid-beta induces release of C3 from astrocytes and impairs microglial amyloid-beta phagocytosis.

    “Lian and colleagues demonstrated that Aβ induced release of C3 from astrocytes and impaired microglial Aβ phagocytosis (125).”
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    IL-1β enhances amyloid-beta pathology and increases tau pathology.

    “IL-1β, a key cytokine of the innate immune response, was shown to enhance Aβ pathology (126), as well as increase tau pathology (109).”
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    • cites [126] Griffin, 2002, Interleukin-1 in the genesis and progression of and risk for development of neuronal degeneration in Alzheimer’s disease, J Leukoc Biol source

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    Premisecitation

    The NLRP3 inflammasome is critical for maturation of IL-1β, and loss of NLRP3 in APP/PS1 mice decreases amyloid burden.

    “The NLRP3 inflammasome is critical for maturation of IL-1β, and loss of NLRP3 in APP/PS1 decreased amyloid burden (131).”
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    • cites [131] Heneka, 2013, NLRP3 is activated in Alzheimer’s disease and contributes to pathology in APP/PS1 mice, Nature source

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    Increased microglial proliferation is observed in several murine Alzheimer's disease models, appearing with plaque onset and persisting for 18 months.

    “Increased microglial proliferation was observed in several murine AD models (63), appearing with plaque onset and persisting for 18 months (63).”
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    The microglial turnover rate in healthy brain was reported as 0.05% at any given time, but recent data from the same group indicate a turnover rate of 0.69%.

    “Lawson and colleagues reported a microglial turnover rate of 0.05% at any given time in healthy brain (141), but recent data from the same group indicated a turnover rate of 0.69% (7).”
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    Premisecitation

    IL-10 levels are elevated in Alzheimer's disease brain, and IL-10 overexpression in mice increases APOE expression and worsens AD-related pathology and cognitive impairment.

    “IL-10 levels are elevated in AD brain, and IL-10 overexpression in mice increased APOE expression in addition to worsening AD-related pathology and cognitive impairment (132).”
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    Microglia from TNFR-deficient 3xTgAD mice show defective phagocytosis, highlighting a protective role for TNF-α in clearance mechanisms.

    “microglia from TNFR-deficient 3xTgAD mice showed defective phagocytosis, highlighting the protective role of TNF-α in facilitating clearance mechanisms.”
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    Il10 deletion leads to increased amyloid-beta phagocytosis and increased CD68 reactivity in amyloid-beta deposit-associated microglia.

    “Il10 deletion led to increased Aβ phagocytosis and increased CD68 reactivity in Aβ depositassociated microglia (133).”
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    Increased microglial proliferation is described in the brains of Alzheimer's disease patients and in the prodromal stage of Parkinson disease, suggesting that microglial proliferation is an early event in neurodegenerative diseases.

    “Increased microglial proliferation has been described in the brains of AD patients (135), and in the prodromal stage of Parkinson disease (136), suggesting that microglial proliferation is an early event in the course of neurodegenerative diseases.”
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    • cites [136] Doorn, 2014, Hippocampal proliferation is increased in presymptomatic Parkinson’s disease and due to microglia, Neural Plast source

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    Premisecitation

    TNFR deficiency in 3xTgAD mice is associated with increased amyloid deposition and enhanced tau phosphorylation.

    “TNF receptor (TNFR) deficiency in 3xTgAD mice was associated with increased amyloid deposition and enhanced tau phosphorylation (129).”
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    Premisecitation

    TREM2 deficiency impairs microglial phagocytosis of plaques opsonized with anti-amyloid-beta antibodies, suggesting a critical role for TREM2 in the efficacy of antibody-based therapeutics.

    “TREM2 deficiency impairs microglial phagocytosis of plaques opsonized with anti-Aβ antibodies, suggesting a critical role for TREM2 in the efficacy of antibody-based therapeutics (152).”
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    Premisecitation

    TREM2 promotes phagocytosis of apoptotic neurons, proliferation, and survival of microglia, and dampens TLR-induced inflammatory responses.

    “TREM2 promotes phagocytosis of apoptotic neurons, proliferation, and survival of microglia, and has been implicated in dampening TLR-induced inflammatory responses (147-151).”
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    Premisecitation

    The CEBP/α/PU.1 pathway is involved in regulating monopoiesis and granulopoiesis and is a candidate for regulating microglial proliferation.

    “the CEBP/α/PU.1 pathway is involved in the regulation of monopoiesis and granulopoiesis (143, 144) and serves as a candidate for regulating proliferation in microglia.”
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    Premisecitation

    Pharmacological inhibition of CSF1R in mice upregulates antiinflammatory mediators, increases synapse and spine densities, and reduces proinflammatory cytokine levels.

    “Pharmacological inhibition of CSF1R in mice upregulated antiinflammatory mediators, including IL-4, IL-5, IL-13, and CCL9, and increased synapse and spine densities while reducing proinflammatory cytokine levels (64).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [64] Olmos-Alonso, 2016, Pharmacological targeting of CSF1R inhibits microglial proliferation and prevents the progression of Alzheimer’s-like pathology, Brain source

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    Interpretationcitation

    Targeting CSF1R has therapeutic potential, but caution is warranted because CSF1R haploinsufficiency is linked to adult-onset leukoencephalopathy with axonal spheroids and pigmented glia.

    “Although targeting CSF1R has therapeutic potential, caution should be taken, as CSF1R haploinsufficiency was linked to adult-onset leukoencephalopathy with axonal spheroids and pigmented glia (145).”
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    Premisecitation

    TREM2 expression is increased in CD45hi LyC+ myeloid cells around amyloid plaques, but not in parenchymal P2Y12+ microglia.

    “TREM2 was upregulated in CD45 hi LyC + myeloid cells surrounding the amyloid plaques, but not in parenchymal P2Y12 + microglia (155).”
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    • cites [155] source

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    Premisecitation

    Certain Alzheimer's disease risk variants in TREM2 reduce TREM2's transport to the cell surface and its expression.

    “AD risk variants in TREM2 impair the cell surface transport and expression of TREM2; some variants either impair or markedly enhance the binding of TREM2 to phospholipids, suggesting that balanced TREM2 function in AD is important to counteract disease progression (147).”
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    Premisecitation

    In these mice, the removal of those plaque-associated myeloid cells results in less inflammation and less Alzheimer's-like pathology.

    “TREM2 deficiency eliminated plaque-associated CD45 hi LyC + myeloid cells, leading to reduced inflammation and AD-like pathology in these mice (155); however, TREM2-expressing myeloid cells were enriched in microglia processes contacting amyloid deposits in AD mice, and TREM2 deletion resulted in less compact plaques and increased dystrophic neurites.”
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    Premisecitation

    Altered gamma oscillations have been found in neurological disorders.

    “Gamma oscillations arise from the activation of local circuits of excitatory and fast-spiking inhibitory neurons resonating at 20-50 Hz, and changes in gamma oscillation have been observed in neurological diseases (158).”
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    Premisecitation

    These amyloid reductions accompany morphological changes, including enlarged soma and shortened processes filled with Aβ.

    “Interestingly, entraining gamma oscillation at 40 Hz in 5xFAD mice induced amyloid reductions that were associated with an increase in microglial numbers and morphological changes such as soma enlargement and shortening of processes loaded with Aβ.”
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    Premisecitation

    Gamma oscillations are generated by local circuits of excitatory and fast-spiking inhibitory neurons that resonate at 20-50 Hz.

    “Gamma oscillations arise from the activation of local circuits of excitatory and fast-spiking inhibitory neurons resonating at 20-50 Hz, and changes in gamma oscillation have been observed in neurological diseases (158).”
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    Interpretationcitation

    Pairing human iPSC technology with recent gene-editing advances will create new ways to model pathology that better mimics human Alzheimer's disease.

    “It seems that combining human induced pluripotent stem cell (iPSC) technology (159) with recent advances in gene editing will provide new opportunities to model disease pathology that more closely resembles human AD.”
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    • The authors state this as an assumption: Existing mouse models do not show clear neurodegeneration or human-like tau pathology unless a tau mutation is used to induce the disease.
38 of 38
  • The authors state this as an assumption.

    Aging strongly affects innate immunity and is a major risk factor for Alzheimer's disease.

    “Given that age has a dramatic impact on innate immunity and represents a major risk factor for AD, more longitudinal studies need to be performed and the overall outcome of immune modulation needs to be tested in aged animals.”
  • The authors state this as an assumption.

    Existing mouse models do not show clear neurodegeneration or human-like tau pathology unless a tau mutation is used to induce the disease.

    “One limitation of current mouse models is the absence of clear neurodegeneration and human-like tau pathology unless the disease is induced by a tau mutation.”
2 of 2

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Neuroinflammation is a key contributor to Alzheimer's disease progression; prolonged activation of microglia and astrocytes leads to chronic inflammation and release of pro-inflammatory cytokines such as IL-1β and TNF-α, promoting neuronal damage in vulnerable brain regions like the neocortex and hippocampus.

    “Neuroinflammation is a key contributor to AD progression. While early immune responses may aid in the clearance of Aβ and tau aggregates, prolonged activation of microglia and astrocytes leads to chronic inflammation and the release of pro-inflammatory cytokines such as IL-1β and TNF-α, promoting neuronal damage in vulnerable brain regions like the neocortex and hippocampus [34–36].”

    From Targeted Nanoparticles for Drug Delivery Across the Blood–Brain Barrier in Early and Late Stages of Alzheimer's Disease: A Review (2026) · cites this paper as [34]

    Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

    Experimental — accuracy not yet measured
  • Microglia facilitate Aβ clearance through phagocytosis and can also exacerbate neurodegeneration by driving persistent neuroinflammation.

    “For example, they facilitate the clearance of Aβ through phagocytosis42, yet they can also exacerbate neurodegeneration by driving persistent neuroinflammation43.”
  • Microglia are brain-resident innate immune effector cells and are widely thought to be the key mediators of amyloid beta clearance.

    “Microglia are brain-resident innate immune effector cells and are widely thought to be the key mediators of amyloid beta clearance [14–16].”
  • AD is characterized by the hallmark pathology comprised of widespread amyloid-β (Aβ) deposition, neurofibrillary tangle (NFT) formation, extensive neurodegeneration, and profound activation of microglia in the brain.

    “Alzheimer's disease (AD) is characterized by the hallmark pathology comprised of widespread amyloid-β (Aβ) deposition, neurofibrillary tangle (NFT) formation, extensive neurodegeneration, and profound activation of microglia in the brain (6).”
  • In the early stages of AD, activated microglia cause phagocytosis and clearance of pathologic Aβ and/or tau, positively affecting AD pathologies in animal models.

    “In the early stages of AD, activated microglia cause phagocytosis and clearance of pathologic Aβ and/or tau, positively affecting AD pathologies in animal models [89, 90].”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • COX-2 treatment result conflicts with the proposed disease-stage effect

    Minor

    The paper places slow decliners earlier in the disease trajectory and says the selective COX-2 inhibitor celecoxib benefited them. It later suggests that blocking COX-2 in early phases may be harmful.

  • C5a blockade effect conflicts with the cited reference title

    Minor

    The text says blocking C5a increased Aβ levels and associates complement blockade with increased neurodegeneration, citing reference 124. That reference's title instead reports decreased pathology after antagonizing the C5a receptor.

2 of 2

Cites

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1 of the 162 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. 10.1146/annurev-immunol-051116-052358 · DOI · Paper page

Cited by

Sorted by citations

Authors
Sarlus, H., & Heneka, M. T.
Affiliations
University of Bonn (DE)
Corresponding author
Heneka, Michael T.
Venue
Journal of Clinical Investigation
Published
2017-09-01
Volume
127
Issue
9
Pages
3240-3249
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W2750718695
Cited by
911
References
162
Citations by year
2026: 64 · 2025: 98 · 2024: 109 · 2023: 105 · 2022: 134 · 2021: 127 · 2020: 148 · 2019: 66 · 2018: 52 · 2017: 7
FWCI
7.20
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Open Repository and Bibliography (University of Luxembourg) (submittedVersion)
  • The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion)
  • DZNE Pub (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
microglia, Alzheimer's disease, microglial activation, neuroinflammation, phagocytosis, neuroprotection, microglial receptors, neurodegeneration, brain homeostasis
MeSH terms
Alzheimer Disease, Animals, Brain, Central Nervous System, Complement System Proteins, Humans, Immune System, Inflammation, Macrophages, Phagocytosis, Cytokines, Microglia, Neurodegenerative Diseases, Cell Proliferation, Toll-Like Receptors, Mice

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