Cited by 144Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsPhagocytosis and Immune Regulation

TREM2 promotes Aβ phagocytosis by upregulating C/EBPα-dependent CD36 expression in microglia

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Kim, Su-Man, Mun, Bo-Ram, Lee, Sun-Jun, Joh, Yechan, Lee, Hwa-Youn, Ji, Kon-Young, Choi, Ha-Rim, Lee, Eun-Hee +6 more·2017·Scientific Reports

Abstract

TREM2 plays a critical role in the alleviation of Alzheimer’s disease by promoting Aβ phagocytosis by microglia, but the detailed molecular mechanism underlying TREM2-induced direct phagocytic activity of Aβ remains to be revealed. We found that learning and memory functions were improved in aged TREM2 TG mice, with the opposite effects in KO mice. The amount of phagocytosed Aβ was significantly reduced in the primary microglia of KO mice. CD36 expression in primary microglia was greater in TG than in WT mice but was substantially decreased in KO mice. The expression of C/EBPα, an upstream transcriptional activator of CD36, was also elevated in primary microglia of TG mice but decreased in KO mice. The transcription of CD36 was markedly increased by TREM2 overexpression, and this effect was suppressed by a mutation of the C/EBPα binding site on the CD36 promoter. The TREM2-induced expression of CD36 and C/EBPα was inhibited by treatment with PI3K/AKT signaling blockers, and phosphorylation of AKT was elevated in TREM2-overexpressing BV2 cells. The present study provides evidence that TREM2 is required for preventing loss of memory and learning in Alzheimer’s disease by regulating C/EBPα-dependent CD36 expression and the consequent Aβ phagocytosis.

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  • Lack of Trem2 reduces chemotaxis and phagocytosis of microglia.

    “Furthermore, lack of Trem2 reduces chemotaxis and phagocytosis of microglia (54, 55).”

    From Deletion of <i>Abi3</i> gene locus exacerbates neuropathological features of Alzheimer’s disease in a mouse model of Aβ amyloidosis (2021) · cites this paper as [54]

    The Results section reports reduced Aβ phagocytosis in TREM2-knockout microglia. The Discussion also describes reduced microglial migration with TREM2 deficiency, but it does not establish reduced chemotaxis specifically (directed movement toward a chemical cue). (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Trem2 activates multiple signaling pathways involved in actin cytoskeleton organization.

    “It was also demonstrated that Trem2 activates multiple signaling pathways involved in actin cytoskeleton organization (54).”

    From Deletion of <i>Abi3</i> gene locus exacerbates neuropathological features of Alzheimer’s disease in a mouse model of Aβ amyloidosis (2021) · cites this paper as [54]

    The Introduction (page unavailable) says TREM2 signaling proceeds through multiple mediators, including PI3K, AKT and ERK. Neither that passage nor the searched passages on actin and cytoskeletal remodeling link those pathways to actin cytoskeleton organization, so that part of the claim is unsupported by our copy. (LLM, conf=0.86)

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Authors
Kim, S.-M., Mun, B.-R., Lee, S.-J., Joh, Y., Lee, H.-Y., Ji, K.-Y., Choi, H.-R., Lee, E.-H., Kim, E.-M., Jang, J.-H., Song, H.-W., Mook-Jung, I., Choi, W.-S., & Kang, H.-S.
Affiliations
  • Chonnam National University (KR)
  • Daegu-Gyeongbuk Medical Innovation Foundation (KR)
  • Nambu University (KR)
  • Korea Atomic Energy Research Institute (KR)
  • Korea Institute of Toxicology (KR)
Corresponding author
  • Choi, Won-Seok
  • Kang, Hyung-Sik
Venue
Scientific Reports
Published
2017-09-11
Volume
7
Issue
1
Pages
11118-11118
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2751088224
Cited by
143
References
32
Citations by year
2026: 12 · 2025: 13 · 2024: 38 · 2023: 23 · 2022: 18 · 2021: 13 · 2020: 9 · 2019: 13 · 2018: 4
FWCI
3.54
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Research Foundation
  • National Research Foundation of Korea (2016R1D1A3B03931710)
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, amyloid-beta phagocytosis, microglia, CD36, C/EBPα, Alzheimer's disease, learning and memory, PI3K/Akt signaling, Akt phosphorylation, TREM2 knockout mice
MeSH terms
Animals, Immunohistochemistry, Membrane Glycoproteins, Mice, Transgenic, Neurons, Phagocytes, Phagocytosis, Receptors, Immunologic, Biomarkers, Gene Expression Regulation, Neoplastic, Amyloid beta-Peptides, Microglia, Mice, Knockout, CD36 Antigens, CCAAT-Enhancer-Binding Proteins, Mice

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