Cited by 763Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsInflammasome and immune disorders

TREM2 Is a Receptor for β-Amyloid that Mediates Microglial Function

Open access
Zhao, Yingjun, Wu, Xilin, Li, Xiaoguang, Jiang, Lu-Lin, Gui, Xun, Liu, Yan, Sun, Yu, Zhu, Bing +8 more·2018·Neuron

Abstract

Mutations in triggering receptor expressed on myeloid cells 2 (TREM2) have been linked to increased Alzheimer's disease (AD) risk. Neurobiological functions of TREM2 and its pathophysiological ligands remain elusive. Here we found that TREM2 directly binds to β-amyloid (Aβ) oligomers with nanomolar affinity, whereas AD-associated TREM2 mutations reduce Aβ binding. TREM2 deficiency impairs Aβ degradation in primary microglial culture and mouse brain. Aβ-induced microglial depolarization, K+ inward current induction, cytokine expression and secretion, migration, proliferation, apoptosis, and morphological changes are dependent on TREM2. In addition, TREM2 interaction with its signaling adaptor DAP12 is enhanced by Aβ, regulating downstream phosphorylation of SYK and GSK3β. Our data demonstrate TREM2 as a microglial Aβ receptor transducing physiological and AD-related pathological effects associated with Aβ.

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Registry

Crossref · 10.1016/j.neuron.2018.01.031

Cites

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  • TREM2 activation supports microglia's migration toward amyloid plaques, preventing amyloid spread.

    “Ordinarily, TREM2 activation is considered as a beneficial response in that it supports microglia’s migration toward amyloid plaques, preventing amyloid spread221–224”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [221]

    The Results section on TREM2 deficiency in vivo says TREM2 drives microglial migration to sites of Aβ enrichment and mediates Aβ clearance. It does not establish that this migration prevents amyloid spread; the Discussion says TREM2’s effects on plaque deposition differ across models and that a definitive mechanism has not been established. No page numbers are available in our copy. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • TREM2, expressed by DAM/MGnD, exerts protective function in AD via ligation of ApoE or Aβ oligomers.

    “TREM2, a receptor expressed by DAM/MGnD, which exerts its protective function in AD via ligation of ApoE (apolipoprotein E), which binds to loose Aβ aggregates, or direct ligation of Aβ oligomers [286, 295, 338, 357, 366]”

    From Microglia and monocytes in inflammatory CNS disease: integrating phenotype and function (2022) · cites this paper as [366]

    The Results section, “TREM2 Binds to Aβ Oligomers” (page unavailable), demonstrates direct binding, and the in vivo Results describe TREM2-mediated Aβ degradation and microglial responses. The Discussion identifies ApoE as a TREM2 ligand but says its interplay with Aβ remains to be determined; it also cautions that a definitive model of TREM2’s role in AD has not been established. The cited passages do not establish ApoE binding to loose Aβ aggregates or expression specifically by DAM/MGnD. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Several other AD risk polymorphisms, such as the R47H TREM2 mutation, alter microglial phagocytic capacity, leading to reduced clearance of Aβ aggregates and neuronal decline.

    “Several other polymorphisms implicated as risk factors in AD, such as the R47H TREM2 mutation, result in alterations to microglial phagocytic capacity that lead to reduced clearance of Aβ aggregates and neuronal decline [27, 28].”

    From Heterozygous expression of the Alzheimer’s disease-protective PLCγ2 P522R variant enhances Aβ clearance while preserving synapses (2022) · cites this paper as [28]

    The Introduction identifies R47H as an AD-risk variant, and the Results (‘TREM2 Binds to Aβ Oligomers’; page unavailable) show that it compromises TREM2 binding to Aβ oligomers. But the Results on Aβ degradation report that TREM2 deletion had little effect on microglial phagocytic uptake, while reducing degradation after uptake. The paper does not establish that R47H causes reduced clearance of Aβ aggregates or consequent neuronal decline. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • TREM2 binding to Aβ promotes its phagocytosis by microglia, which induces secretion of pro-inflammatory cytokines IL-6 and CCL3, increases microglial proliferation, migration, and apoptosis, and reduces intracellular K+ concentrations.

    “TREM2 binding to Aβ promotes its phagocytosis by microglia, which in turn induces secretion of pro-inflammatory cytokines IL-6 and CCL3, increases microglial proliferation, migration and apoptosis and reduces intracellular K+ concentrations [31, 36].”

    From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [31]

    The Results sections on cytokine secretion and in vivo microglial responses report TREM2-dependent IL-6 and CCL3 secretion, migration, proliferation, and apoptosis after Aβ exposure (page numbers unavailable). But the Results section on Aβ degradation says TREM2 deletion had little effect on phagocytic uptake; it affected degradation instead. That section reports K+ currents and membrane potential, not a reduction in intracellular K+ concentration. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • TREM2 ligands include zwitterionic and anionic phospholipids, glycolipids, apoptotic cells, lipoproteins such as HDL, LDL, APOE and APOJ/CLU, as well as Aβ.

    “TREM2 ligands include zwitterionic and anionic phospholipids, glycolipids, apoptotic cells, lipoproteins such as HDL, LDL, APOE and APOJ/CLU, as well as Aβ [30, 31].”

    From Microglial function, INPP5D/SHIP1 signaling, and NLRP3 inflammasome activation: implications for Alzheimer’s disease (2023) · cites this paper as [31]

    The Results report TREM2 binding to Aβ oligomers, and the Introduction and Discussion identify lipids and ApoE as TREM2 ligands. The copy does not establish the more specific lipid classes or HDL and LDL as ligands. It describes TREM2-mediated clearance of apoptotic debris, not binding to apoptotic cells; CLU/APOJ appears in the title of a cited study rather than in this paper’s findings. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 1

  1. Guerreiro R Hardy J 2013 TREM2 and neurodegenerative disease N Engl J Med 369 1569 1570 24143816

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Authors
Zhao, Y., Wu, X., Li, X., Jiang, L.-L., Gui, X., Liu, Y., Sun, Y., Zhu, B., Piña-Crespo, J. C., Zhang, M., Zhang, N., Chen, X., Bu, G., An, Z., Huang, T. Y., & Xu, H.
Affiliations
  • Sanford Burnham Prebys Medical Discovery Institute (US)
  • Fujian Medical University (CN)
  • Brown Foundation Institute of Molecular Medicine for the Prevention of Human Diseases (US)
  • Xiamen University (CN)
  • Mayo Clinic (US)
Corresponding author
Xu, Huaxi
Venue
Neuron
Publisher
Elsevier BV
Published
2018-03
Volume
97
Issue
5
Pages
1023-1031.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2793872352
Cited by
763
References
45
Citations by year
2026: 77 · 2025: 100 · 2024: 104 · 2023: 98 · 2022: 107 · 2021: 93 · 2020: 93 · 2019: 54 · 2018: 36
FWCI
31.07
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
  • National Natural Science Foundation of China (U1505227, 81771163, U1405222)
  • National Institutes of Health (R21 AG048519, R01 NS046673, RF1 AG056130, RF1 AG056114, R01 AG044420, R01 AG021173, R01 AG038710)
  • Cure Alzheimer's Fund
  • Welch Foundation (AU-0042-20030616)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
TREM2, amyloid-beta, Alzheimer's disease, microglia, DAP12, Syk, GSK3β, microglial migration, cytokine production, amyloid degradation, ligand-receptor interactions
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Animals, Brain, Cells, Cultured, Double-Blind Method, Female, Humans, Male, Membrane Glycoproteins, Mice, Inbred C3H, Mice, Inbred C57BL, Mice, Transgenic, Protein Binding, Receptors, Immunologic, Amyloid beta-Peptides, Microglia, Mice, Knockout, Mice, HEK293 Cells

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