Cited by 275Neuroinflammation and Neurodegeneration MechanismsTryptophan and brain disordersStress Responses and Cortisol

Peripheral innate immune challenge exaggerated microglia activation, increased the number of inflammatory CNS macrophages, and prolonged social withdrawal in socially defeated mice

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Wohleb, Eric S., Fenn, Ashley M., Pacenta, Ann M., Powell, Nicole D., Sheridan, John F., Godbout, Jonathan P.·2012·Psychoneuroendocrinology

Abstract

Repeated social defeat (RSD) activates neuroendocrine pathways that have a significant influence on immunity and behavior. Previous studies from our lab indicate that RSD enhances the inflammatory capacity of CD11b⁺ cells in the brain and promotes anxiety-like behavior in an interleukin (IL)-1 and β-adrenergic receptor-dependent manner. The purpose of this study was to determine the degree to which mice subjected to RSD were more responsive to a secondary immune challenge. Therefore, RSD or control (HCC) mice were injected with saline or lipopolysaccharide (LPS) and activation of brain CD11b⁺ cells and behavioral responses were determined. Peripheral LPS (0.5 mg/kg) injection caused an extended sickness response with exaggerated weight loss and prolonged social withdrawal in socially defeated mice. LPS injection also amplified mRNA expression of IL-1β, tumor necrosis factor (TNF)-α, inducible nitric oxide synthase (iNOS), and CD14 in enriched CD11b⁺ cells isolated from socially defeated mice. In addition, IL-1β mRNA levels in enriched CD11b⁺ cells remained elevated in socially defeated mice 24 h and 72 h after LPS. Moreover, microglia and CNS macrophages isolated from socially defeated mice had the highest CD14 expression after LPS injection. Both social defeat and LPS injection increased the percentage of CD11b⁺/CD45(high) macrophages in the brain and the number of inflammatory macrophages (CD11b⁺/CD45(high)/CCR2⁺) was highest in RSD-LPS mice. Anxiety-like behavior was increased by social defeat, but was not exacerbated by the LPS challenge. Nonetheless, reduced locomotor activity and increased social withdrawal were still present in socially defeated mice 72 h after LPS. Last, LPS-induced microglia activation was most evident in the hippocampus of socially defeated mice. Taken together, these findings demonstrate that repeated social defeat enhanced the neuroinflammatory response and caused prolonged sickness following innate immune challenge.

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Crossref · 10.1016/j.psyneuen.2012.02.003

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  • Functionally, microglia are primed to later activation, as they produce an exaggerated proinflammatory response to subsequent immunological challenges.

    “Functionally, microglia are 'primed' to later activation, as they produce an exaggerated proinflammatory response to subsequent immunological challenges (Wohleb et al, 2012).”
  • RSD also increases depressive-like behaviors, including social avoidance, and these effects can persist at least 8 days after stressor termination with some persisting up to 24 days.

    “RSD also increases depressive-like behaviors, including social avoidance (Wohleb et al, 2012;Ramirez et al, 2015b).”
  • Neuroinflammatory signaling is increased by RSD and is argued to facilitate vulnerability toward mood disorders.

    “In addition to activating neuronal fear/anxiety circuitry, neuroinflammatory signaling is increased by RSD (Kinsey et al, 2007;Wohleb et al, 2012) that is argued to facilitate vulnerability toward mood disorders (Haroon et al, 2012).”
  • The increase of CD11b+/CD45 high persisted despite vascular perfusion, indicating that the monocyte/macrophages adhered to the vasculature or entered the parenchyma.

    “It is important to note that the increase of CD11b + /CD45 high persisted despite vascular perfusion, and hence the CD11b + /CD45 high monocyte/macrophages adhered to the vasculature or entered the parenchyma (Wohleb et al, 2012).”
  • Stress exposure activates microglia and increases proinflammatory cytokine (IL-1β, TNF-α, IL-6) and chemokine (CCL2) signaling, thereby providing a direct pathway to upregulate adhesion molecules.

    “As discussed above, stress exposure activates microglia and increases proinflammatory cytokine (IL-1β, TNF-α, IL-6) and chemokine (CCL2) signaling (Wohleb et al, 2012), thereby providing a direct pathway to upregulate adhesion molecules.”

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Authors
Wohleb, E. S., Fenn, A. M., Pacenta, A. M., Powell, N. D., Sheridan, J. F., & Godbout, J. P.
Affiliations
The Ohio State University (US)
Corresponding author
Godbout, Jonathan P.
Venue
Psychoneuroendocrinology
Publisher
Elsevier BV
Published
2012-09
Volume
37
Issue
9
Pages
1491-1505
ISSN
0306-4530 (ISSN-L)
OpenAlex
W2068671283
Cited by
275
References
69
Citations by year
2026: 7 · 2025: 15 · 2024: 10 · 2023: 15 · 2022: 24 · 2021: 23 · 2020: 33 · 2019: 28 · 2018: 20 · 2017: 19 · 2016: 24 · 2015: 21 · 2014: 17 · 2013: 15 · 2012: 4
FWCI
9.17
Type
journal article
Language
en
Open access
Locations
  • Psychoneuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Dental and Craniofacial Research (T32DE014320)
  • National Institute on Aging (R01AG033028)
  • Howard Hughes Medical Institute
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
repeated social defeat, microglial activation, neuroinflammation, lipopolysaccharide challenge, sickness behavior, social withdrawal, CD11b+ macrophages, CCR2, IL-1β, CD14, TNF-α, inducible nitric oxide synthase, anxiety-like behavior, hippocampus, innate immunity, neuroendocrine-immune interaction
MeSH terms
Animals, Behavior, Animal, Brain, Cell Count, Dominance-Subordination, Immunity, Innate, Inflammation, Lipopolysaccharides, Macrophages, Male, Social Isolation, Tumor Necrosis Factor-alpha, Microglia, Mice, Nitric Oxide Synthase Type II, Interleukin-1beta

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