AD-linked R47H- TREM2 mutation induces disease-enhancing proinflammatory microglial states in mice and humans
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The hemizygous R47H variant of TREM2 , a microglia-specific gene in the brain, increases risk for late-onset Alzheimer’s disease (AD). In this study, we identified a subpopulation of microglia with disease-enhancing proinflammatory signatures associated with the R47H mutation in human AD brains and tauopathy mouse brains. Using transcriptomic analysis at the single-nuclei level from AD patients with the R47H or the common variant (CV )-TREM2 with matched sex, pathology and APOE status, we found that the R47H mutation was associated with cell type- and sex-specific transcriptional changes in human AD brains, with microglia exhibiting the most robust alterations. Further characterization revealed that R47H-associated microglial subpopulations had enhanced inflammatory signatures including hyperactivation of Akt, one of the signaling pathways downstream of TREM2. In a newly-generated tauopathy knock-in mouse model expressing one allele of human TREM2 ( hTREM2) with either the R47H mutation or CV, R47H induced and exacerbated tau-mediated spatial memory deficits in female mice. Single-cell transcriptomic analysis of microglia from these mice also revealed transcriptomic changes induced by R47H that had significant overlaps with R47H microglia in human AD brains, including robust increases in proinflammatory cytokines, activation of Syk-Akt-signaling, and elevation of a subset of disease-associated microglial signatures. Strikingly, pharmacological Akt inhibition largely reversed the enhanced inflammatory signatures induced by R47H in primary microglia treated with tau fibrils. By unraveling the disease-enhancing properties of the R47H mutation in mouse and human, our findings shed light on an immune-linked AD subtype and provide new directions for modulating microglial immune responses to treat AD.
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The most characterised variant of TREM2 (p.R47H) shows defects in ligand binding, which impacts the ability of TREM2 to recognise damage, and induce microglial changes, resulting in a dampened response to pathological insults such as Aβ deposition.
“The most characterised variant of TREM2 (p.R47H) shows defects in ligand binding [6, 37, 38, 97], which impacts the ability of TREM2 to recognise damage, and induce microglial changes, resulting in a dampened response to pathological insults such as Aβ deposition.”
From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [38]
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Experimental — accuracy not yet measuredTREM2 p.R47H is associated with increased expression of pro-inflammatory cytokines.
“increased expression of pro-inflammatory cytokines [38]”
From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [38]
It has been suggested that p.R47H leads to hyperactivation of Akt downstream of Trem2.
“it has been suggested that p.R47H leads to hyperactivation of Akt downstream of Trem2 [38]”
From TREM2/PLCγ2 signalling in immune cells: function, structural insight, and potential therapeutic modulation (2021) · cites this paper as [38]
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Magno, L., Bunney, T. D., Mead, E., Svensson, F., & Bictash, M. N. (2021) · Molecular Neurodegeneration · doi:10.1186/s13024-021-00436-5 · Cited by 64 · see citing works
- Authors
- Sayed, F. A., Kodama, L., Udeochu, J. C., Fan, L., Carling, G. K., Le, D., Li, Q., Zhou, L., Mathys, H., Wang, M., Niu, X., Mazutis, L., Jiang, X., Wang, X., Wong, M. Y., Gao, F., Telpoukhovskaia, M., Tracy, T. E., Frost, G., Zhou, Y., Li, Y., Brendel, M., Qiu, Y., Cheng, Z., Yu, G., Hardy, J., Coppola, G., Gong, S., Wang, F., DeTure, M. A., Zhang, B., Xie, L., Dickson, D. W., Luo, W., & Gan, L.
- Affiliations
- Gladstone Institutes (US)
- Weill Cornell Medicine (US)
- Stanford Medicine (US)
- Massachusetts Institute of Technology (US)
- Icahn School of Medicine at Mount Sinai (US)
- University of California, Los Angeles (US)
- Cornell University (US)
- The Graduate Center, CUNY (US)
- Virginia Tech (US)
- UCL Queen Square Institute of Neurology (GB)
- Mayo Clinic (US)
- Corresponding author
- Gan, Li
- ORCID
- Sayed, Faten A.
- Kodama, Lay
- Udeochu, Joe C.
- Fan, Li
- Carling, Gillian K.
- Le, David
- Li, Qingyun
- Zhou, Lu
- Mathys, Hansruedi
- Wang, Minghui
- Niu, Xiang
- Jiang, Xueqiao
- Wang, Xueting
- Wong, Man Ying
- Gao, Fuying
- Telpoukhovskaia, Maria
- Tracy, Tara E.
- Frost, Georgia
- Li, Yaqiao
- Brendel, Matthew
- Qiu, Yue
- Cheng, Zuolin
- Hardy, John
- Coppola, Giovanni
- Gong, Shiaoching
- Wang, Fei
- DeTure, Michael A.
- Zhang, Bin
- Xie, Lei
- Dickson, Dennis W.
- Luo, Wenjie
- Gan, Li
- Venue
- bioRxiv (Cold Spring Harbor Laboratory)
- Publisher
- openRxiv
- Published
- 2020-07-25
- OpenAlex
- W3044915822
- Cited by
- 3
- References
- 26
- Citations by year
- 2021: 2 · 2020: 1
- Type
- posted content
- Language
- en
- Open access
- green
- doi.org
- Locations
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- Funders
- National Science Foundation (T32GM007618)
- Memorial Sloan-Kettering Cancer Center
- Gladstone Institutes
- Wellcome Trust (202903/Z/16/Z)
- Alzheimer's Society
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (P2BSP3, 202903, 151885)
- UK Dementia Research Institute
- Weill Cornell Medical College
- University of California, San Francisco (T32GM007618)
- Medical Research Council (MR/N026004/, MR/N026004/1, 202903/Z/16/Z)
- National Institute of Mental Health (MH110504, R01MH110504)
- National Institute of General Medical Sciences (T32GM007618)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
- Keywords
- Alzheimer's disease, microglia, tauopathy, Akt signaling, single-nucleus transcriptomics, sex differences, tau fibrils, spatial memory impairment, AKT inhibition
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