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Interferon-γ from Brain Leukocytes Enhances Meningitis by Type 4 Streptococcus pneumoniae
Elena Pettini1, Fabio Fiorino1, Anna Maria Cuppone1
1Laboratorio di Microbiologia Molecolare e Biotecnologia, Dipartimento di Biotecnologie Mediche, Università degli Studi di Siena Siena, Italy.
Frontiers in Microbiology
|December 10, 2015
Summary
Interferon-gamma (IFN-γ) exacerbates pneumococcal meningitis pathogenesis, increasing disease severity. Blocking IFN-γ with antibodies improved survival in a mouse model, highlighting its detrimental role.
Area of Science:
- Immunology
- Neuroscience
- Infectious Diseases
Background:
- Streptococcus pneumoniae causes bacterial meningitis, a severe infection with high mortality.
- The brain's inflammatory response can worsen meningitis, despite immune clearance being essential.
Purpose of the Study:
- To investigate the local inflammatory response in pneumococcal meningitis.
- To determine the role of Interferon-gamma (IFN-γ) in disease pathogenesis and survival.
Main Methods:
- A murine model of meningitis was established using intracranial injection of type 4 S. pneumoniae.
- Immune cell populations and cytokine gene expression were analyzed post-infection.
- Mice were treated with anti-IFN-γ antibodies to assess survival rates.
Main Results:
- Infection led to increased lymphocytes, NK cells, neutrophils, monocytes, and macrophages in the brain.
- IFN-γ mRNA levels significantly increased (240-fold) in infected mouse brains.
- Pro-inflammatory cytokines (IL-1β, TNF-α) and TLR2 were upregulated.
- Treatment with anti-IFN-γ antibody improved survival.
Conclusions:
- IFN-γ produced during pneumococcal meningitis negatively impacts disease outcome.
- Targeting IFN-γ may be a therapeutic strategy for pneumococcal meningitis.
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