Cited by 215Neuroinflammation and Neurodegeneration MechanismsInflammasome and immune disordersStress Responses and Cortisol

Stress Induces the Danger-Associated Molecular Pattern HMGB-1 in the Hippocampus of Male Sprague Dawley Rats: A Priming Stimulus of Microglia and the NLRP3 Inflammasome

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Weber, Michael D., Frank, Matthew G., Tracey, Kevin J., Watkins, Linda R., Maier, Steven F.·2015·The Journal of Neuroscience

Abstract

Exposure to acute and chronic stressors sensitizes the proinflammatory response of microglia to a subsequent immune challenge. However, the proximal signal by which stressors prime microglia remains unclear. Here, high mobility group box-1 (HMGB-1) protein was explored as a potential mediator of stress-induced microglial priming and whether HMGB-1 does so via the nucleotide-binding domain, leucine-rich repeat, pyrin domain containing protein 3 (NLRP3) inflammasome. Exposure to 100 inescapable tail shocks (ISs) increased HMGB-1 and NLRP3 protein in the hippocampus and led isolated microglia to release HMGB-1 ex vivo. To determine whether HMGB-1 signaling is necessary for stress-induced sensitization of microglia, the HMGB-1 antagonist BoxA was injected into the cisterna magna before IS. Hippocampal microglia were isolated 24 h later and stimulated with LPS ex vivo to probe for stress-induced sensitization of proinflammatory responses. Previous IS potentiated gene expression of NLRP3 and proinflammatory cytokines to LPS, that is, microglia were sensitized. Treatment with BoxA abolished this effect. To determine whether HMGB-1 is sufficient to prime microglia, IS was replaced with intracerebral administration of disulfide or fully reduced HMGB-1. Intracerebral disulfide HMGB-1 mimicked the effect of the stressor, because microglia isolated from HMGB-1-treated rats expressed exaggerated NLRP3 and proinflammatory cytokine expression after LPS treatment, whereas fully reduced HMGB-1 had no effect. The present results suggest that the CNS innate immune system can respond to an acute stressor as if it were cellular damage, thereby releasing the danger signal HMGB-1 in the brain to prime microglia by acting on the NLRP3 inflammasome, in preparation for a later immune challenge.

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Crossref · 10.1523/jneurosci.3561-14.2015

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  • Exposure to acute stress (inescapable tailshock) increases NLRP3 protein in the hippocampus up to 24 h after stress treatment; microglial IL-1β was not increased at that time-point post stress.

    “We have also found that exposure to acute stress, in this case inescapable tailshock, increases NLRP3 protein in the hippocampus up to 24 h after stress treatment; however, microglial IL-1β was not increased at that time-point post stress (Weber et al, 2015).”
  • Intracisterna magna administration of an HMGB1 antagonist (box A) before stress exposure blocked the potentiated microglial proinflammatory response to an immune challenge ex vivo.

    “we found that intracisterna magna administration of an HMGB1 antagonist (box A) before stress exposure blocked the potentiated microglial proinflammatory response to an immune challenge ex vivo.”
  • Exposure to an acute stressor (inescapable tailshock) induces HMGB1 in the hippocampus concomitant with increased protein levels of active NF-κB and NLRP3 protein.

    “We recently found that exposure to an acute stressor (inescapable tailshock) induces HMGB1 in the hippocampus concomitant with increased protein levels of active NF-κB and NLRP3 protein (Weber et al, 2015).”
  • Treatment of hippocampal microglia with the TLR4 agonist LPS resulted in a potentiated IL-1β response in animals exposed to stress 24 h earlier, suggesting that the NLRP3 inflammasome was primed by initial stress exposure.

    “treatment of hippocampal microglia with the TLR4 agonist LPS resulted in a potentiated IL-1β response in animals exposed to stress 24 h earlier, suggesting that the NLRP3 inflammasome was primed by initial stress exposure.”
  • HMGB-1 is highly expressed in the CNS and implicated in a variety of neuroinflammatory conditions, including stress.

    “Recently, HMGB-1 was found to be highly expressed in the CNS and was implicated in a variety of neuroinflammatory conditions (Kang et al, 2014), including stress (Weber et al, 2015).”

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Authors
Weber, M. D., Frank, M. G., Tracey, K. J., Watkins, L. R., & Maier, S. F.
Affiliations
  • University of Colorado Boulder (US)
  • Northwell Health (US)
Venue
The Journal of Neuroscience
Published
2015-01-07
Volume
35
Issue
1
Pages
316-324
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2087987871
Cited by
215
References
46
Citations by year
2026: 10 · 2025: 10 · 2024: 12 · 2023: 11 · 2022: 20 · 2021: 21 · 2020: 25 · 2019: 19 · 2018: 24 · 2017: 25 · 2016: 21 · 2015: 16
FWCI
15.29
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (MH096224, R21MH096224)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
HMGB1, NLRP3 inflammasome, microglial priming, hippocampus, inflammatory cytokines, lipopolysaccharide response, damage-associated molecular patterns
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Animals, Carrier Proteins, Hippocampus, Male, Stress, Psychological, Rats, Sprague-Dawley, Microglia, Receptors, Cytoplasmic and Nuclear, HMGB1 Protein, Rats, Inflammasomes

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