Cited by 671Neuroinflammation and Neurodegeneration MechanismsMosquito-borne diseases and controlNeurological Disease Mechanisms and Treatments

The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.

A complement–microglial axis drives synapse loss during virus-induced memory impairment

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Abstract

Over 50% of patients who survive neuroinvasive infection with West Nile virus (WNV) exhibit chronic cognitive sequelae. Although thousands of cases of WNV-mediated memory dysfunction accrue annually, the mechanisms responsible for these impairments are unknown. The classical complement cascade, a key component of innate immune pathogen defence, mediates synaptic pruning by microglia during early postnatal development. Here we show that viral infection of adult hippocampal neurons induces complement-mediated elimination of presynaptic terminals in a murine WNV neuroinvasive disease model. Inoculation of WNV-NS5-E218A, a WNV with a mutant NS5(E218A) protein leads to survival rates and cognitive dysfunction that mirror human WNV neuroinvasive disease. WNV-NS5-E218A-recovered mice (recovery defined as survival after acute infection) display impaired spatial learning and persistence of phagocytic microglia without loss of hippocampal neurons or volume. Hippocampi from WNV-NS5-E218A-recovered mice with poor spatial learning show increased expression of genes that drive synaptic remodelling by microglia via complement. C1QA was upregulated and localized to microglia, infected neurons and presynaptic terminals during WNV neuroinvasive disease. Murine and human WNV neuroinvasive disease post-mortem samples exhibit loss of hippocampal CA3 presynaptic terminals, and murine studies revealed microglial engulfment of presynaptic terminals during acute infection and after recovery. Mice with fewer microglia (Il34(-/-) mice with a deficiency in IL-34 production) or deficiency in complement C3 or C3a receptor were protected from WNV-induced synaptic terminal loss. Our study provides a new murine model of WNV-induced spatial memory impairment, and identifies a potential mechanism underlying neurocognitive impairment in patients recovering from WNV neuroinvasive disease.

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Metadata

Authors
Vasek, M. J., Garber, C., Dorsey, D., Durrant, D. M., Bollman, B., Soung, A., Yu, J., Perez-Torres, C., Frouin, A., Wilton, D. K., Funk, K., DeMasters, B. K., Jiang, X., Bowen, J. R., Mennerick, S., Robinson, J. K., Garbow, J. R., Tyler, K. L., Suthar, M. S., Schmidt, R. E., Stevens, B., & Klein, R. S.
Affiliations
  • Washington University in St. Louis (US)
  • Boston Children's Hospital (US)
  • University of Colorado Anschutz (US)
  • Emory University (US)
  • Stony Brook University (US)
Corresponding author
Klein, Robyn S.
Venue
Nature
Published
2016-06-22
Volume
534
Issue
7608
Pages
538-543
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2471701648
Cited by
671
References
33
Citations by year
2026: 33 · 2025: 44 · 2024: 70 · 2023: 78 · 2022: 87 · 2021: 110 · 2020: 64 · 2019: 63 · 2018: 57 · 2017: 55 · 2016: 8
FWCI
33.42
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Cancer Institute (P30CA091842)
  • National Institute of Allergy and Infectious Diseases (U19AI083019, R01AI101400, T32AI052066)
  • National Institute of Neurological Disorders and Stroke (R01NS052632, F31NS077640)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (U54HD090255)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
West Nile virus, complement system, microglia, synaptic pruning, memory impairment, hippocampus, C1QA, C3a receptor, IL-34, neuroinvasive infection, spatial learning, CA3, neuroinflammation, viral encephalitis, complement C3a
MeSH terms
Animals, Complement System Proteins, Complement Activation, Complement Pathway, Classical, Disease Models, Animal, Female, Humans, Male, Memory Disorders, Neuronal Plasticity, Neurons, West Nile Fever, West Nile virus, Microglia, Presynaptic Terminals, Mice, CA3 Region, Hippocampal, Spatial Memory

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