Cited by 68Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeuroscience and Neuropharmacology Research

Microglia TREM2R47H Alzheimer-linked variant enhances excitatory transmission and reduces LTP via increased TNF-α levels

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Ren, Siqiang, Yao, Wen, Tambini, Marc D, Yin, Tao, Norris, Kelly A, D'Adamio, Luciano·2020·eLife

Abstract

To study the mechanisms by which the p.R47H variant of the microglia gene and Alzheimer’s disease (AD) risk factor TREM2 increases dementia risk, we created Trem2R47H KI rats. Trem2R47H rats were engineered to produce human Aβ to define human-Aβ-dependent and -independent pathogenic mechanisms triggered by this variant. Interestingly, pre- and peri-adolescent Trem2R47H rats present increased brain concentrations of TNF-α, augmented glutamatergic transmission, suppression of Long-term-Potentiation (LTP), an electrophysiological surrogate of learning and memory, but normal Aβ levels. Acute reduction of TNF-α activity with a neutralizing anti-TNF-α antibody occludes the boost in amplitude of glutamatergic transmission and LTP suppression observed in young Trem2R47H/R47H rats. Thus, the microglia-specific pathogenic Trem2 variant boosts glutamatergic neuronal transmission and suppresses LTP by increasing brain TNF-α concentrations, directly linking microglia to neuronal dysfunction. Future studies will determine whether this phenomenon represents an early, Aβ-independent pathway that facilitates dementia pathogenesis in humans.

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Authors
Ren, S., Yao, W., Tambini, M. D., Yin, T., Norris, K. A., & D'Adamio, L.
Affiliations
Rutgers, The State University of New Jersey (US)
Corresponding author
D'Adamio, Luciano
Venue
eLife
Published
2020-06-24
Volume
9
ISSN
2050-084X (ISSN-L)
OpenAlex
W3037953859
Cited by
68
References
43
Citations by year
2026: 10 · 2025: 12 · 2024: 5 · 2023: 19 · 2022: 6 · 2021: 11 · 2020: 5
FWCI
3.96
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institute on Aging (R01AG063407, RF1AG064821)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
TREM2, Alzheimer's disease, microglia, TNF-α, glutamatergic neurotransmission, long-term potentiation, learning and memory, amyloid-beta, anti-TNF-alpha antibody, dementia risk, neuronal dysfunction
MeSH terms
Aging, Animals, Female, Gene Expression Regulation, Genotype, Macrophages, Male, Membrane Glycoproteins, Receptors, Immunologic, RNA, Messenger, Tumor Necrosis Factor-alpha, Genetic Variation, Cytokines, Microglia, Long-Term Potentiation, Glutamic Acid, Rats

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