Cited by 174Tryptophan and brain disordersStress Responses and CortisolNeuroinflammation and Neurodegeneration Mechanisms

Stress-induced neuroinflammation is mediated by GSK3-dependent TLR4 signaling that promotes susceptibility to depression-like behavior

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Cheng, Yuyan, Pardo, Marta, Armini, Rubia de Souza, Martinez, Ana, Mouhsine, Hadley, Zagury, Jean-Francois, Jope, Richard S., Beurel, Eleonore·2016·Brain, Behavior, and Immunity

Abstract

Most psychiatric and neurological diseases are exacerbated by stress. Because this may partially result from stress-induced inflammation, we examined factors involved in this stress response. After a paradigm of inescapable foot shock stress that causes learned helplessness depression-like behavior, eighteen cytokines and chemokines increased in mouse hippocampus, peaking 6-12h after stress. A 24h prior pre-conditioning stress accelerated the rate of stress-induced hippocampal cytokine and chemokine increases, with most reaching peak levels after 1-3h, often without altering the maximal levels. Toll-like receptor 4 (TLR4) was involved in this response because most stress-induced hippocampal cytokines and chemokines were attenuated in TLR4 knockout mice. Stress activated glycogen synthase kinase-3 (GSK3) in wild-type mouse hippocampus, but not in TLR4 knockout mice. Administration of the antidepressant fluoxetine or the GSK3 inhibitor TDZD-8 reduced the stress-induced increases of most hippocampal cytokines and chemokines. Stress increased hippocampal levels of the danger-associated molecular pattern (DAMP) protein high mobility group box 1 (HMGB1), activated the inflammatory transcription factor NF-κB, and the NLRP3 inflammasome. Knockdown of HMGB1 blocked the acceleration of cytokine and chemokine increases in the hippocampus caused by two successive stresses. Fluoxetine treatment blocked stress-induced up-regulation of HMGB1 and subsequent NF-κB activation, whereas TDZD-8 administration attenuated NF-κB activation downstream of HMGB1. To test if stress-induced cytokines and chemokines contribute to depression-like behavior, the learned helplessness model was assessed. Antagonism of TNFα modestly reduced susceptibility to learned helplessness induction, whereas TLR4 knockout mice were resistant to learned helplessness. Thus, stress-induces a broad inflammatory response in mouse hippocampus that involves TLR4, GSK3, and downstream inflammatory signaling, and these stress responses contribute to susceptibility to depression-like behavior in mice.

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Crossref · 10.1016/j.bbi.2015.12.012

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  • Exposure to an initial series of acute footshocks increased NLRP3 as well as mature caspase-1 in the hippocampus.

    “They found that exposure to an initial series of acute footshocks increased NLRP3 as well as mature caspase-1 in the hippocampus.”
  • If a second series of footshocks was administered 24 h after the initial series, IL-1β protein was increased, suggesting that the initial series of shocks had primed the NLRP3 inflammasome.

    “if a second series of footshocks was administered 24 h after the initial series of footshocks, IL-1β protein was increased, suggesting that the initial series of shocks had primed the NLRP3 inflammasome.”
  • Intranasal pre-treatment with HMGB1 siRNA blocked stress-induced increases in IL-1β protein.

    “Intranasal pre-treatment with HMGB1 siRNA was found to significantly reduce hippocampal protein levels of HMGB1 and blocked stress-induced increases in IL-1β protein, suggesting that HMGB1 mediates the priming effects of stress on IL-1β.”
  • Exposure to a second series of footshocks 24 h after the initial series resulted in increased hippocampal IL-1β protein and mRNA.

    “As noted earlier, initial stress exposure failed to increase IL-1β protein; however, exposure to second series of footshocks 24 h after the initial series of footshocks resulted in increased hippocampal IL-1β protein and mRNA.”
  • In Cheng et al. (2016), exposure to a series of footshocks increased hippocampal active NF-κB, NLRP3, and mature caspase-1 protein.

    “Consistent with these findings, Cheng et al (2016) also found that exposure to a series of footshocks increased hippocampal protein levels of HMGB1 along with increased active NF-κB, NLRP3, and mature caspase-1 protein (Cheng et al, 2016).”

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Authors
Cheng, Y., Pardo, M., Armini, R. D. S., Martinez, A., Mouhsine, H., Zagury, J.-F., Jope, R. S., & Beurel, E.
Affiliations
  • University of Miami (US)
  • Conservatoire National des Arts et Métiers (FR)
Corresponding author
Jope, Richard S.
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2016-03
Volume
53
Pages
207-222
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2226515760
Cited by
174
References
102
Citations by year
2026: 12 · 2025: 16 · 2024: 16 · 2023: 22 · 2022: 16 · 2021: 22 · 2020: 23 · 2019: 13 · 2018: 11 · 2017: 14 · 2016: 9
FWCI
5.35
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIMH (MH095380, MH038752, MH090236, MH104656)
  • Expedition Inspiration Foundation
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
depression-like behavior, TLR4 signaling, glycogen synthase kinase-3, hippocampus, cytokines, chemokines, HMGB1, NF-κB, NLRP3 inflammasome, learned helplessness, inescapable footshock, fluoxetine, TDZD-8, TNF-α, damage-associated molecular patterns, antidepressant resistance
MeSH terms
Animals, Depression, Fluoxetine, Hippocampus, Inflammation, Male, Stress, Physiological, Tumor Necrosis Factor-alpha, Neuroimmunomodulation, Signal Transduction, Up-Regulation, Cytokines, NF-kappa B, Mice, Knockout, HMGB1 Protein, Glycogen Synthase Kinase 3, Toll-Like Receptor 4, Mice, Inflammasomes

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