Cited by 133Neuroinflammation and Neurodegeneration MechanismsInflammation biomarkers and pathwaysPhagocytosis and Immune Regulation

DAP12 stabilizes the C-terminal fragment of the triggering receptor expressed on myeloid cells-2 (TREM2) and protects against LPS-induced pro-inflammatory response

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Zhong, Li, Chen, Xiao-Fen, Zhang, Zhen-Lian, Wang, Zhe, Shi, Xin-Zhen, Xu, Kai, Zhang, Yun-Wu, Xu, Huaxi +1 more·2015·Journal of Biological Chemistry

Abstract

Triggering receptor expressed on myeloid cells 2 (TREM2) is a DAP12-associated receptor expressed in microglia, macrophages, and other myeloid-derived cells. Previous studies have suggested that TREM2/DAP12 signaling pathway reduces inflammatory responses and promotes phagocytosis of apoptotic neurons. Recently, TREM2 has been identified as a risk gene for Alzheimer disease (AD). Here, we show that DAP12 stabilizes the C-terminal fragment of TREM2 (TREM2-CTF), a substrate for γ-secretase. Co-expression of DAP12 with TREM2 selectively increased the level of TREM2-CTF with little effects on that of full-length TREM2. The interaction between DAP12 and TREM2 is essential for TREM2-CTF stabilization as a mutant form of DAP12 with disrupted interaction with TREM2 failed to exhibit such an effect. Silencing of either Trem2 or Dap12 gene significantly exacerbated pro-inflammatory responses induced by lipopolysaccharides (LPS). Importantly, overexpression of either full-length TREM2 or TREM2-CTF reduced LPS-induced inflammatory responses. Taken together, our results support a role of DAP12 in stabilizing TREM2-CTF, thereby protecting against excessive pro-inflammatory responses. Background: TREM2 is a DAP12-coupled receptor associated with neurodegenerative diseases. Results: Co-expression of DAP12 increased the level of TREM2 C-terminal fragment (TREM2-CTF) which suppressed the release of pro-inflammatory cytokines. Conclusion: A major function of DAP12 is to stabilize TREM2-CTF, which regulates inflammatory responses in microglia. Significance: Our studies unraveled a novel function of DAP12 and provided new link between TREM2/DAP12 complexes and neuroinflammation.

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Crossref · 10.1074/jbc.m115.645986

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Authors
Zhong, L., Chen, X.-F., Zhang, Z.-L., Wang, Z., Shi, X.-Z., Xu, K., Zhang, Y.-W., Xu, H., & Bu, G.
Affiliations
  • Xiamen University (CN)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
Corresponding author
  • Chen, Xiao-Fen
  • Bu, Guojun
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2015-06
Volume
290
Issue
25
Pages
15866-15877
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1519122400
Cited by
133
References
47
Citations by year
2026: 7 · 2025: 8 · 2024: 9 · 2023: 14 · 2022: 14 · 2021: 15 · 2020: 16 · 2019: 12 · 2018: 13 · 2017: 13 · 2016: 6 · 2015: 6
FWCI
6.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
National Institutes of Health (R01AG027924, R01AG035355, R01AG046205, 81370459, 31400914)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Inflammation biomarkers and pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
TREM2, DAP12, protein stabilization, gamma-secretase, lipopolysaccharide, pro-inflammatory response, microglia, neuroinflammation, Alzheimer's disease, inflammatory cytokines, myeloid cells
MeSH terms
Animals, Humans, Inflammation, Lipopolysaccharides, Membrane Glycoproteins, Membrane Proteins, Mutation, Receptors, Immunologic, Protein Structure, Tertiary, Adaptor Proteins, Signal Transducing, Mice, Amyloid Precursor Protein Secretases, Protein Stability, HEK293 Cells

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