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Published on: May 18, 2015
Stress increases vulnerability to inflammation in the rat prefrontal cortex
R M de Pablos1, R F Villarán, S Argüelles
1Departamento de Bioquímica, Bromatología, Toxicología y Medicina Legal, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain.
Summary
Stress exacerbates inflammation in the brain's prefrontal cortex (PFC), increasing neuroinflammation and neuronal loss. Glucocorticoid receptor inhibition offered protection, suggesting a link between stress, inflammation, and neurodegeneration.
Area of Science:
- Neuroscience
- Neuroinflammation
- Neurodegeneration
Background:
- Inflammation is implicated in neurodegenerative disorders, but its relationship with brain region sensitivity is unclear.
- The prefrontal cortex (PFC) exhibits relative inflammation resistance yet is vulnerable in neurodegenerative diseases.
- Stress may heighten susceptibility to inflammation in brain regions like the PFC.
Purpose of the Study:
- To investigate if stress enhances inflammation susceptibility in the rat prefrontal cortex (PFC).
- To assess the impact of stress and inflammation on neuronal markers, inflammatory cytokines, and behavior.
- To explore the neuroprotective potential of glucocorticoid receptor inhibition.
Main Methods:
- Induced inflammation via lipopolysaccharide (LPS) injection in stressed and non-stressed rats.
- Assessed inflammatory markers (microglia, TNF-alpha), neuronal populations (astroglia, neurons), BDNF, and MAP kinases.
- Utilized immunohistochemistry, in situ hybridization, and behavioral analysis.
Main Results:
- Stress amplified LPS-induced inflammation, including microglial activation and increased tumor necrosis factor-alpha.
- Stress and LPS caused astroglia and neuronal loss, with altered BDNF mRNA and MAP kinase phosphorylation.
- RU486 (glucocorticoid receptor antagonist) demonstrated a protective effect.
Conclusions:
- Stress synergizes with inflammation in the PFC, worsening neuroinflammatory damage.
- This synergistic effect may explain the link between stress and neurodegenerative pathologies.
- Targeting glucocorticoid receptors could be a therapeutic strategy for stress-related neurodegeneration.
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