Cited by 699Neuroinflammation and Neurodegeneration MechanismsParkinson's Disease Mechanisms and TreatmentsImmune Response and Inflammation

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Toll‐like receptor 4 is required for α‐synuclein dependent activation of microglia and astroglia

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Abstract

Alpha‐synucleinopathies (ASP) are neurodegenerative disorders, characterized by accumulation of misfolded α‐synuclein, selective neuronal loss, and extensive gliosis. It is accepted that microgliosis and astrogliosis contribute to the disease progression in ASP. Toll‐like receptors (TLRs) are expressed on cells of the innate immune system, including glia, and TLR4 dysregulation may play a role in ASP pathogenesis. In this study we aimed to define the involvement of TLR4 in microglial and astroglial activation induced by different forms of α‐synuclein (full length soluble, fibrillized, and C‐terminally truncated). Purified primary wild type (TLR4+/+) and TLR4 deficient (TLR4−/−) murine microglial and astroglial cell cultures were treated with recombinant α‐synuclein and phagocytic activity, NFκB nuclear translocation, cytokine release, and reactive oxygen species (ROS) production were measured. We show that TLR4 mediates α‐synuclein‐induced microglial phagocytic activity, pro‐inflammatory cytokine release, and ROS production. TLR4−/− astroglia present a suppressed pro‐inflammatory response and decreased ROS production triggered by α‐synuclein treatment. However, the uptake of α‐synuclein by primary astroglia is not dependent on TLR4 expression. Our results indicate the C‐terminally truncated form as the most potent inductor of TLR4‐dependent glial activation. The current findings suggest that TLR4 plays a modulatory role on glial pro‐inflammatory responses and ROS production triggered by α‐synuclein. In contrast to microglia, the uptake of alpha‐synuclein by astroglia is not dependent on TLR4. Our data provide novel insights into the mechanisms of α‐synuclein‐induced microglial and astroglial activation which may have an impact on understanding the pathogenesis of ASP. © 2012 Wiley Periodicals, Inc.

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Metadata

Authors
Fellner, L., Irschick, R., Schanda, K., Reindl, M., Klimaschewski, L., Poewe, W., Wenning, G. K., & Stefanova, N.
Affiliations
Innsbruck Medical University (AT)
Corresponding author
Stefanova, Nadia
Venue
Glia
Publisher
Wiley
Published
2012-10-25
Volume
61
Issue
3
Pages
349-360
ISSN
  • 0894-1491 (ISSN-L)
  • 1098-1136
OpenAlex
W2019863741
Cited by
697
References
64
Citations by year
2026: 31 · 2025: 45 · 2024: 80 · 2023: 54 · 2022: 59 · 2021: 89 · 2020: 79 · 2019: 54 · 2018: 53 · 2017: 42 · 2016: 31 · 2015: 34 · 2014: 31 · 2013: 14
FWCI
12.70
Type
journal article
Language
en
Open access
Locations
  • Glia (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Austrian Science Fund (F4404, P19989)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Clinical Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
TLR4, alpha-synuclein, synucleinopathies, microglial activation, astroglial activation, microglial phagocytosis, reactive oxygen species, inflammatory cytokines, NF-κB nuclear translocation, glial activation, neuroinflammation
MeSH terms
Animals, Astrocytes, Cells, Cultured, Gliosis, Inflammation, Phagocytosis, Tumor Necrosis Factor-alpha, Interleukin-6, NF-kappa B, Reactive Oxygen Species, Microglia, Mice, Knockout, Protein Transport, Toll-Like Receptor 4, Mice, alpha-Synuclein, Chemokine CXCL1

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