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Microglia and a functional type I IFN pathway are required to counter HSV-1-driven brain lateral ventricle

Christopher D Conrady1, Min Zheng, Nico van Rooijen

  • 1Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|February 6, 2013
PubMed

Insights

Herpes simplex virus type 1 (HSV-1) encephalitis causes brain swelling, increasing mortality. Reducing this swelling in mice with a novel peptide significantly lowered deaths, suggesting a new therapeutic target for HSV-1 brain infections.

Area of Science:

  • Neuroscience
  • Immunology
  • Virology

Background:

  • Herpes simplex virus type 1 (HSV-1) is a primary cause of viral encephalitis.
  • Current treatments, like acyclovir, have limitations, with high mortality and frequent neurological deficits.
  • The mechanisms driving HSV-1-induced central nervous system (CNS) pathology remain unclear.

Purpose of the Study:

  • To investigate the mechanisms of HSV-1 entry and spread within the murine brain.
  • To identify factors contributing to mortality and neurological deficits in HSV-1 encephalitis.
  • To explore potential therapeutic strategies targeting HSV-1-induced CNS pathology.

Main Methods:

  • Utilized magnetic resonance imaging (MRI) and type I interferon (IFN) receptor-deficient mouse chimeras.
  • Analyzed cerebrospinal fluid (CSF) for inflammatory mediators (CXCL1, CXCL10, TNF-α).
  • Assessed the impact of anti-secretory factor peptide 16 on mortality and viral load.

Main Results:

  • HSV-1 infection led to lateral ventricle enlargement and parenchymal infection in mice, mirroring findings in some human patients.
  • Encephalitis correlated with increased CXCL1/CXCL10 and TNF-α, and neutrophil infiltration.
  • Anti-secretory factor peptide 16 significantly reduced mortality by mitigating lateral ventricle enlargement.
  • Microglial cells were identified as key mediators of CNS resistance via a type I IFN-dependent pathway.

Conclusions:

  • Lateral ventricle enlargement is implicated as a major contributor to mortality in HSV-1 encephalitis.
  • Anti-secretory factor peptide 16 shows promise in reducing mortality in HSV-1-infected mice.
  • This study highlights the critical role of microglial cells and type I IFN signaling in controlling HSV-1 CNS infections.

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