Cited by 198Neuroinflammation and Neurodegeneration MechanismsTryptophan and brain disordersImmune Response and Inflammation

Lipopolysaccharide-induced interleukin (IL)-4 receptor-α expression and corresponding sensitivity to the M2 promoting effects of IL-4 are impaired in microglia of aged mice

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Fenn, Ashley M., Henry, Christopher J., Huang, Yan, Dugan, Allison, Godbout, Jonathan P.·2012·Brain, Behavior, and Immunity

Abstract

In several models of aging, microglia become more inflammatory and reactive to immune challenges. For example, peripheral LPS injection causes exaggerated microglial activation associated with prolonged sickness and depressive-like behavior in aged BALB/c mice. Therefore, the purpose of this study was to determine the extent to which age-related amplified microglial activation was associated with reduced sensitivity to the anti-inflammatory and M2 promoting cytokines interleukin (IL)-10 and IL-4. In initial studies with adult mice, LPS induced a time-dependent increase in M1 and M2 mRNA profiles in microglia. Furthermore, peripheral LPS injection markedly increased surface expression of IL-4 receptor-alpha (IL-4Rα), but not IL-10 receptor-1 (IL-10R1) on microglia. In BV-2 cells, IL-4, but not IL-10, re-directed LPS-activated microglia towards an M2 phenotype. Based on these findings, comparisons of M1 and M2 activation profiles, induction of IL-4Rα, and sensitivity to IL-4 were determined in microglia from adult (3-4 mo) and aged (18-22 mo) mice. In aged microglia, LPS promoted an exaggerated and prolonged M1 and M2 profile compared to adults. Moreover, IL-4Rα protein was not increased on aged microglia following LPS injection. To determine the consequence of impaired IL-4Rα upregulation, adult and aged mice were injected with LPS and activated microglia were then isolated and treated ex vivo with IL-4. While ex vivo IL-4 induced an M2 profile in activated microglia from adult mice, activated microglia from aged mice retained a prominent M1 profile. These data indicate that activated microglia from aged mice are less sensitive to the anti-inflammatory and M2-promoting effects of IL-4.

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  • Aged mice fail to upregulate IL-4Rα in response to LPS and do not elicit an alternative (regulatory) immune response to ex vivo IL-4.

    “Aged mice failed to upregulate IL-4Rα in response to LPS, and did not elicit an alternative (regulatory) immune response to ex vivo IL-4 (Fenn et al, 2012).”

    From Microglia Priming with Aging and Stress (2017) · cites this paper as Fenn et al, 2012

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Authors
Fenn, A. M., Henry, C. J., Huang, Y., Dugan, A., & Godbout, J. P.
Affiliations
The Ohio State University (US)
Corresponding author
Godbout, Jonathan P.
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2012-07
Volume
26
Issue
5
Pages
766-777
ISSN
0889-1591 (ISSN-L)
OpenAlex
W1987015752
Cited by
198
References
85
Citations by year
2026: 9 · 2025: 12 · 2024: 7 · 2023: 16 · 2022: 13 · 2021: 19 · 2020: 12 · 2019: 7 · 2018: 9 · 2017: 8 · 2016: 28 · 2015: 18 · 2014: 18 · 2013: 14 · 2012: 8
FWCI
7.06
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institutes of Health
  • National Institute on Aging (R01AG033028)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
microglia, aging, lipopolysaccharide, IL-4, IL-4 receptor alpha, M2 microglia, M1 microglia, IL-10, IL-10 receptor 1, microglial activation, anti-inflammatory cytokines, neuroinflammation, aged mice
MeSH terms
Aging, Animals, Cell Separation, Cells, Cultured, Flow Cytometry, Inflammation, Lipopolysaccharides, Macrophage Activation, Male, Mice, Inbred BALB C, Receptors, Cell Surface, RNA, Interleukin-4, Microglia, Mice, Interleukin-4 Receptor alpha Subunit, Interleukin-10 Receptor alpha Subunit, Real-Time Polymerase Chain Reaction

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