What happens to microglial TREM2 in Alzheimer’s disease: Immunoregulatory turned into immunopathogenic?
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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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).”
From PU.1 dictates β-amyloid-induced TREM2 expression upregulation in microglia in a transgenic model of Alzheimer’s disease (2025) · cites this paper as Lue et al., 2015
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The amyloid hypothesis of Alzheimer's disease at 25 years
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Could Alzheimer’s Disease Originate in the Periphery and If So How So?
Morris, G., Berk, M., Maes, M. H. J., & Puri, B. K. (2018) · Molecular Neurobiology · doi:10.1007/s12035-018-1092-y · Cited by 83 · see citing works
Early Life Stress and Epigenetics in Late-onset Alzheimer’s Dementia: A Systematic Review
Lemche, E. (2018) · Current Genomics · doi:10.2174/1389202919666171229145156 · Cited by 82 · see citing works
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Novel targets in Alzheimer’s disease: A special focus on microglia
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“Conversely, TREM2 is an AD-associated risk gene coding a transmembrane protein that is highly expressed in microglia and known to regulate their function in neurodegeneration [104,108].”
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Friedrich, U., Datta, S., Schubert, T. E. O., Plößl, K., Schneider, M., Graßmann, F., Fuchshofer, R., Tiefenbach, K., Längst, G., & Weber, B. H. F. (2015) · Human Molecular Genetics · doi:10.1093/hmg/ddv346 · Cited by 50 · see citing works
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Alzheimer’s Disease: From Genetic Variants to the Distinct Pathological Mechanisms
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Microglia in Neurodegenerative Events—An Initiator or a Significant Other?
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Variable expression of microglial DAP12 and TREM2 genes in Nasu-Hakola disease
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Alzheimer’s Disease Research Using Human Microglia
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Microglia and microglial-based receptors in the pathogenesis and treatment of Alzheimer’s disease
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The versatile role of TREM2 in regulating of microglia fate in the ischemic stroke
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“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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TREM2 Recognition of Candidalysin Orchestrates Mucosal Immunity in Oropharyngeal CandidiasisPreprint
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(2024) · Elsevier eBooks · doi:10.1016/b978-0-443-23565-8.09996-8
Zhou, Z., Jiang, C., & Chen, Z. (2026) · Research Square · doi:10.21203/rs.3.rs-9504119/v1
- 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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