TREM2, microglia, and Alzheimer’s disease.
Abstract
Triggering receptor expressed on myeloid cells 2 (TREM2) has been suggested to play a crucial role in Alzheimer's disease (AD) pathogenesis, as revealed by genome-wide association studies (GWAS). Since then, rapidly increasing literature related to TREM2 has focused on elucidating its role in AD pathology. In this review, we summarize our understanding of TREM2 biology, explore TREM2 functions in microglia, address the multiple mechanisms of TREM2 in AD, and raise key questions for further investigations to elucidate the detailed roles and molecular mechanisms of TREM2 in microglial responses. A major breakthrough in our understanding of TREM2 is based on our hypothesis suggesting that TREM2 may act as a multifaceted player in microglial functions in AD brain homeostasis. We conclude that TREM2 can not only influence microglial functions in amyloid and tau pathologies but also participate in inflammatory responses and metabolism, acting alone or with other molecules, such as apolipoprotein E (APOE). This review provides novel insight into the broad role of TREM2 in microglial function in AD and enables us to develop new strategies aimed at the immune system to treat AD pathogenesis.
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The R47H missense mutation in TREM2 significantly increases the risk of AD, with an odds ratio comparable to that of the APOE ε4 allele.
“Notably, the R47H missense mutation in triggering receptor expressed on myeloid cells 2 (TREM2) has been shown to significantly increase the risk of AD, with an odds ratio comparable to that of the APOE ε4 allele”
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 Qin et al., 2021
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“638,639 Some variants associated with AD, such as the TREM2 variant R47H, may potentially diminish the binding or internalization of TREM2 with ligands such as APOE-A β complexes, APOE, phospholipids, and A β .”
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“TREM2 is comprised of three parts: the extracellular domain, transmembrane domain, and intracellular domain (Qin et al., 2021).”
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- Authors
- Qin, Q., Teng, Z., Liu, C., Li, Q., Yin, Y., & Tang, Y.
- Affiliations
- Capital Medical University (CN)
- Chinese Academy of Sciences (CN)
- Ministry of Education of the People's Republic of China (CN)
- Corresponding author
- Tang, Yi
- Venue
- Mechanisms of Ageing and Development
- Publisher
- Elsevier BV
- Published
- 2021-04
- Volume
- 195
- Pages
- 111438
- ISSN
- 0047-6374 (ISSN-L)
- OpenAlex
- W3129189791
- Cited by
- 219
- References
- 46
- Citations by year
- 2026: 35 · 2025: 62 · 2024: 55 · 2023: 30 · 2022: 25 · 2021: 12
- FWCI
- 3.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Mechanisms of Ageing and Development (publishedVersion)
- PubMed (publishedVersion)
- 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, Alzheimer's disease, microglia, amyloid pathology, tau pathology, neuroinflammation, apolipoprotein E, microglial metabolism, brain homeostasis
- MeSH terms
- Alzheimer Disease, Humans, Membrane Glycoproteins, Receptors, Immunologic, Microglia, Drug Discovery
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