Cited by 202Neuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and TreatmentsTryptophan and brain disorders

Fractalkine‐induced activation of the phosphatidylinositol‐3 kinase pathway attentuates microglial activation in vivo and in vitro

Lyons, Anthony, Lynch, Aileen M., Downer, Eric J., Hanley, Riona, O’Sullivan, Joan B., Smith, Andrew, Lynch, Marina A.·2009·Journal of Neurochemistry

Abstract

Several neurodegenerative disorders are associated with evidence of inflammation, one feature of which is increased activation of microglia, the most likely cellular source of inflammatory cytokines like interleukin‐1β. It is now recognized that interaction of microglia with other cells contributes to maintenance of microglia in a quiescent state and the complementary distribution of the chemokine, fractalkine (CX 3 CL1) on neurons and its receptor (CX 3 CR1) on microglia, suggests that this interaction may play a role in modulating microglial activation. Here we demonstrate that both soluble and membrane‐bound fractalkine attenuate lipopolysaccharide‐induced microglial activation in vitro. We also show that fractalkine expression is reduced in the brain of aged rats and this is accompanied by an age‐related increase in microglial activation. Treatment of aged rats with fractalkine attenuates the age‐related increase in microglial activation and the evidence indicates that fractalkine‐induced activation of the phosphatidylinositol‐3 kinase pathway is required to maintain microglia in a quiescent state both in vivo and in vitro.

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Crossref · 10.1111/j.1471-4159.2009.06253.x

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  • Immunosuppressor proteins including CX3CL1 and CD47 (to control microglial and macrophage function) and CFH (to control T-cell activation and block complement triggers) are already activated by neurodegeneration and block overproduction of pro-inflammatory signals.

    “The immunosuppressor proteins, including CX3CL1 and CD47 (to control microglial and macrophage function) and CFH (to control T-cell activation and block complement triggers), are already activated by neurodegeneration and block the overproduction of pro-inflammatory signals (such as inducible nitric oxide synthase, interleukin (IL)-1β, tumor necrosis factor-α (TNF-α), and IL-6) [61,62].”

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Authors
Lyons, A., Lynch, A. M., Downer, E. J., Hanley, R., O’Sullivan, J. B., Smith, A., & Lynch, M. A.
Affiliations
Trinity College Dublin (IE)
Corresponding author
Lynch, Marina A.
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2009-08-10
Volume
110
Issue
5
Pages
1547-1556
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W2036586619
Cited by
202
References
46
Citations by year
2026: 8 · 2025: 8 · 2024: 16 · 2023: 9 · 2022: 15 · 2021: 12 · 2020: 12 · 2019: 16 · 2018: 11 · 2017: 13 · 2016: 12 · 2015: 5 · 2014: 10 · 2013: 16 · 2012: 11
FWCI
8.31
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Science Foundation Ireland
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
fractalkine, CX3CR1, microglial activation, phosphatidylinositol 3-kinase pathway, neuroinflammation, lipopolysaccharide, aging, neurodegenerative diseases, IL-1β, microglia-neuron interaction
MeSH terms
Age Factors, Aging, Animals, Animals, Newborn, Cells, Cultured, Enzyme Activation, Lipopolysaccharides, Male, Membrane Proteins, Solubility, Signal Transduction, Rats, Wistar, Microglia, Phosphatidylinositol 3-Kinases, Rats, Chemokine CX3CL1

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