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

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

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Fellner, Lisa, Irschick, Regina, Schanda, Kathrin, Reindl, Markus, Klimaschewski, Lars, Poewe, Werner, Wenning, Gregor K., Stefanova, Nadia·2013·Glia

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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  • α-synuclein can trigger TLR4 or TLR2 activation in cultured glia, leading to an increase in inflammatory gene transcription.

    “Previous reports showed α-synuclein can trigger TLR4 or TLR2 activation in cultured glia, which leads to an increase in inflammatory gene transcription19,40,41.”

    From Microglia clear neuron-released α-synuclein via selective autophagy and prevent neurodegeneration (2020) · cites this paper as [40]

    The Results (page unavailable) show that α-synuclein treatment caused TLR4-dependent NF-κB nuclear translocation and increased inflammatory cytokine release in cultured murine glia. The paper measured cytokine release, not an increase in inflammatory gene transcription; its experiments address TLR4 rather than TLR2. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • TLR4 is required for NF-κB activation in response to various forms of α-synuclein.

    “TLR4 was required for NF-κB activation, and increased inflammation and phagocytic activity in response to various forms of α-synuclein40,41,56.”
  • TLR4 is required for increased inflammation in response to various forms of α-synuclein.

    “TLR4 was required for NF-κB activation, and increased inflammation and phagocytic activity in response to various forms of α-synuclein40,41,56.”
  • TLR4 is required for increased phagocytic activity in response to various forms of α-synuclein.

    “TLR4 was required for NF-κB activation, and increased inflammation and phagocytic activity in response to various forms of α-synuclein40,41,56.”
  • α-synuclein aggregates induce microglial activation in a TLR-4 dependent manner.

    “For instance, α -synuclein aggregates induce microglial activation (Boza-Serrano et al., 2014) in a TLR-4 dependent manner (Fellner et al., 2013).”

    From TET2 Regulates the Neuroinflammatory Response in Microglia (2019) · cites this paper as Fellner et al., 2013

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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 › 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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