Cited by 105Neuroscience and Neuropharmacology ResearchTryptophan and brain disordersNeuroinflammation and Neurodegeneration Mechanisms

The stress-induced cytokine interleukin-6 decreases the inhibition/excitation ratio in the rat temporal cortex via trans-signaling

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Garcia-Oscos, Francisco, Salgado, Humberto, Hall, Shawn, Thomas, Feba, Farmer, George E., Bermeo, Jorge, Galindo, Luis Charles, Ramirez, Ruben D. +3 more·2012·Biological Psychiatry

Abstract

Background Although it is known that stress elevates the levels of pro-inflammatory cytokines and promotes hyper-excitable central conditions, a causal relationship between these two factors has not yet been identified. Recent studies suggest that increases in interleukin 6 (IL-6) levels are specifically associated with stress. We hypothesized that IL-6 acutely and directly induces cortical hyper-excitability by altering the balance between synaptic excitation and inhibition.Methods We used patch-clamp to determine the effects of exogenous or endogenous IL-6 on electrically evoked postsynaptic currents on a cortical rat slice preparation. We used control subjects or animals systemically injected with lipopolysaccharide or subjected to electrical foot-shock as rat models of stress.Results In control animals, IL-6 did not affect excitatory postsynaptic currents but selectively and reversibly reduced the amplitude of inhibitory postsynaptic currents with a postsynaptic effect. The IL-6-induced inhibitory postsynaptic currents decrease was inhibited by drugs interfering with receptor trafficking and/or internalization, including wortmannin, Brefeldin A, 2-Br-hexadecanoic acid, or dynamin peptide inhibitor. In both animal models, stress-induced decrease in synaptic inhibition/excitation ratio was prevented by prior intra-ventricular injection of an analog of the endogenous IL-6 trans-signaling blocker gp130.Conclusions Our results suggest that stress-induced IL-6 shifts the balance between synaptic inhibition and excitation in favor of the latter, possibly by decreasing the density of functional γ-aminobutyric acid A receptors, accelerating their removal and/or decreasing their insertion rate from/to the plasma membrane. We speculate that this mechanism could contribute to stress-induced detrimental long-term increases in central excitability present in a variety of neurological and psychiatric conditions.

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Crossref · 10.1016/j.biopsych.2011.11.018

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Authors
Garcia-Oscos, F., Salgado, H., Hall, S., Thomas, F., Farmer, G. E., Bermeo, J., Galindo, L. C., Ramirez, R. D., D'Mello, S., Rose-John, S., & Atzori, M.
Affiliations
  • The University of Texas at Dallas (US)
  • Universidad Nacional Autónoma de México (MX)
Corresponding author
Atzori, Marco
Venue
Biological Psychiatry
Publisher
Elsevier BV
Published
2012-04
Volume
71
Issue
7
Pages
574-582
ISSN
0006-3223 (ISSN-L)
OpenAlex
W2083811331
Cited by
105
References
81
Citations by year
2026: 10 · 2025: 11 · 2024: 7 · 2023: 12 · 2022: 7 · 2021: 8 · 2020: 5 · 2019: 3 · 2018: 6 · 2017: 6 · 2016: 6 · 2015: 9 · 2014: 7 · 2013: 3 · 2012: 5
FWCI
1.99
Type
journal article
Language
en
Open access
Locations
  • Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
Deutsche Forschungsgemeinschaft (SFB654, SFB841, SFB877)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
interleukin-6, stress, trans-signaling, gp130, inhibitory postsynaptic currents, excitatory postsynaptic currents, GABAA receptor, receptor trafficking, receptor internalization, lipopolysaccharide, footshock, temporal cortex, inflammatory cytokines, central hyperexcitability
MeSH terms
Wortmannin, Interleukin-6 Inhibitors, Androstadienes, Animals, Disease Models, Animal, Drug Interactions, Electric Stimulation, Lipopolysaccharides, Muscimol, Oligopeptides, Palmitates, Stress, Psychological, Temporal Lobe, Interleukin-6, Excitatory Postsynaptic Potentials, Brefeldin A, Cytokine Receptor gp130, Rats, Inhibitory Postsynaptic Potentials

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