Cited by 378Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsInflammasome and immune disorders

TREM2 Acts Downstream of CD33 in Modulating Microglial Pathology in Alzheimer's Disease

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Griciuc, Ana, Patel, Shaun, Federico, Anthony N., Choi, Se Hoon, Innes, Brendan J., Oram, Mary K., Cereghetti, Gea, McGinty, Danielle +6 more·2019·Neuron

Abstract

The microglial receptors CD33 and TREM2 have been associated with risk for Alzheimer's disease (AD). Here, we investigated crosstalk between CD33 and TREM2. We showed that knockout of CD33 attenuated amyloid beta (Aβ) pathology and improved cognition in 5xFAD mice, both of which were abrogated by additional TREM2 knockout. Knocking out TREM2 in 5xFAD mice exacerbated Aβ pathology and neurodegeneration but reduced Iba1+ cell numbers, all of which could not be rescued by additional CD33 knockout. RNA-seq profiling of microglia revealed that genes related to phagocytosis and signaling (IL-6, IL-8, acute phase response) are upregulated in 5xFAD;CD33-/- and downregulated in 5xFAD;TREM2-/- mice. Differential gene expression in 5xFAD;CD33-/- microglia depended on the presence of TREM2, suggesting TREM2 acts downstream of CD33. Crosstalk between CD33 and TREM2 includes regulation of the IL-1β/IL-1RN axis and a gene set in the "receptor activity chemokine" cluster. Our results should facilitate AD therapeutics targeting these receptors.

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Crossref · 10.1016/j.neuron.2019.06.010

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  • Crosstalk between AD risk immune genes has been demonstrated, notably between Cd33 and Trem2.

    “Crosstalk between AD risk immune genes has been recently demonstrated, notably between Cd33 and Trem2 [79].”
  • Microglia from 5xFAD mice show canonical upregulation of disease-associated microglial markers (e.g. Cst7, Axl, Trem2, Apoe, Ctss) and loss of homeostatic markers (P2ry12, Tmem119).

    “Microglia from these mice have been extensively characterized, revealing the canonical upregulation of disease-associated microglial markers (e.g. Cst7, Axl, Trem2, Apoe, Ctss) and loss of homoestatic markers (P2ry12, Tmem119) that reflect disease-related changes in form and function [12, 50, 51].”
  • CD33 knockout decreases amyloid pathology and improves cognition in 5xFAD mice.

    “CD33 KO results in decreased amyloid pathology and improved cognition in 5xFAD mice.”

    From Alzheimer Disease: An Update on Pathobiology and Treatment Strategies (2019) · cites this paper as Griciuc et al., 2019

  • CD33 acts upstream of TREM2 based on knockout interaction studies.

    “This is abrogated by additional TREM2 KO, however CD33 KO does not reciprocally abrogate effects of TREM2 KO, suggesting that CD33 acts upstream of TREM2 (Griciuc et al.,2019 .”

    From Alzheimer Disease: An Update on Pathobiology and Treatment Strategies (2019) · cites this paper as Griciuc et al., 2019

  • Other studies have not revealed obvious phenotypes in young Trem2 R47H expressing mice, or even Trem2 knockout mice, unless they are aged or bred to amyloid mouse models.

    “Other studies have not revealed obvious phenotypes in young Trem2 R47H expressing mice, or even Trem2 knockout mice, unless they are aged or bred to amyloid mouse models (35,61,85–87).”

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Authors
Griciuc, A., Patel, S., Federico, A. N., Choi, S. H., Innes, B. J., Oram, M. K., Cereghetti, G., McGinty, D., Anselmo, A., Sadreyev, R. I., Hickman, S. E., El Khoury, J., Colonna, M., & Tanzi, R. E.
Affiliations
  • Harvard University (US)
  • Washington University in St. Louis (US)
Corresponding author
Tanzi, Rudolph E.
Venue
Neuron
Publisher
Elsevier BV
Published
2019-09
Volume
103
Issue
5
Pages
820-835.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2961845320
Cited by
378
References
59
Citations by year
2026: 36 · 2025: 63 · 2024: 54 · 2023: 49 · 2022: 65 · 2021: 59 · 2020: 42 · 2019: 8 · 2012: 1
FWCI
19.17
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health
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, CD33, Alzheimer's disease, microglia, amyloid-beta pathology, 5xFAD mice, microglial receptors, phagocytosis, microglial gene expression, neurodegeneration, cognitive impairment, receptor cross-talk
MeSH terms
Acute-Phase Reaction, Alzheimer Disease, Animals, Brain, Cognition, Disease Models, Animal, Gene Expression Regulation, Membrane Glycoproteins, Phagocytosis, Receptors, Immunologic, Interleukin-6, Interleukin-8, Amyloid beta-Peptides, Microglia, Mice, Knockout, Mice, Plaque, Amyloid, Sialic Acid Binding Ig-like Lectin 3

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