Cited by 63Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsPhagocytosis and Immune Regulation

What happens to microglial TREM2 in Alzheimer’s disease: Immunoregulatory turned into immunopathogenic?

Lue, L.-F., Schmitz, C., Walker, D.G.·2015·Neuroscience

Abstract

Microglia play major roles in initiation, coordination and execution of innate immunity in the brain. In the adult brain, these include maintenance of homeostasis, neuron and tissue repair, and eliminating infectious agents, apoptotic cells, and misfolded proteins. Some of these activities are accompanied by inflammatory reactions; and others are performed with no inflammatory effects. Under normal conditions, triggering receptor expressed on myeloid cells 2 (TREM2) belongs to the second category. It pairs with the adaptor protein DNAX-activating protein of 12kDa (DAP12) to induce phagocytosis of apoptotic neurons without inflammatory responses, and to regulate Toll-like receptor-mediated inflammatory responses, and microglial activation. Although ligands for TREM2 are largely unknown, the mitochondrial heat shock protein 60, expressed on cell surface of apoptotic neurons, is a specific ligand that activates TREM2-mediated phagocytosis by microglia. TREM2 also phagocytoses amyloid beta peptide in cultured cells. Several TREM2 mutations have been identified recently that increase the risk of Alzheimer's disease, Frontotemporal dementia, Parkinson's disease, and amyotrophic lateral sclerosis. Some of these mutations cause impaired proteolysis of full-length TREM2 at the plasma membrane to different degrees. The defects in the intramembrane cleavage result in dysfunction of phagocytosis signaling. The association of TREM2 mutations with neurodegenerative disease also calls for the understanding of the biology and pathological role of non-mutated TREM2 on human brains and microglia. This review provides a summary of current literature in TREM2 and DAP12 from several aspects, and proposes a theory that loss of TREM2 functions might contribute to the immunopathogenic role of microglia in Alzheimer's disease.

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Crossref · 10.1016/j.neuroscience.2014.09.050

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  • Persistent upregulation of TREM2 and PU.1 expression in 5xFAD mice may represent a defense response of the innate immune system to counterbalance amyloid plaque accumulation in the AD brain.

    “The persistent upregulation of TREM2 and PU.1 expression in 5 × FAD mice may represent a defense response of the innate immune system to counterbalance amyloid plaque accumulation in the AD brain (Lue et al., 2015).”

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Authors
Lue, L.-F., Schmitz, C., & Walker, D. G.
Affiliations
Banner Sun Health Research Institute (US)
Venue
Neuroscience
Publisher
Elsevier BV
Published
2015-08
Volume
302
Pages
138-150
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2050445129
Cited by
63
References
89
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 5 · 2018: 12 · 2017: 9 · 2016: 11 · 2015: 9
FWCI
0.78
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • The Arizona Department of Health Services
  • National Institute on Aging
  • Arizona Alzheimer Research Consortium
  • Arizona State Department of Health Service
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
TREM2, DAP12, microglia, Alzheimer's disease, phagocytosis, amyloid-beta, mitochondrial Hsp60, microglial activation, neuroinflammation, neurodegenerative diseases, frontotemporal dementia, Parkinson's disease, amyotrophic lateral sclerosis
MeSH terms
Alzheimer Disease, Gene Expression Regulation, Humans, Membrane Glycoproteins, Mutation, Receptors, Immunologic, Microglia

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