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Related Experiment Videos

Virus dissemination through the brain parenchyma without immunologic control

P G Stevenson1, S Freeman, C R Bangham

  • 1Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom.

Journal of Immunology (Baltimore, Md. : 1950)
|August 15, 1997
PubMed
Summary

Neurovirulent influenza virus causes fatal encephalitis. Despite brain inflammation and T cell infiltration, the immune system fails to produce protective antibodies or eliminate the virus.

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Area of Science:

  • Neurovirology
  • Immunology

Background:

  • Neurovirulent influenza virus A/WSN can cause encephalitis.
  • Understanding the immune response to viral brain infections is crucial.

Purpose of the Study:

  • To investigate the pathogenesis of neurovirulent influenza A/WSN infection in the brain.
  • To characterize the immune response during viral encephalitis.

Main Methods:

  • Inoculation of mice with influenza virus A/WSN into cerebrospinal fluid or brain parenchyma.
  • Monitoring clinical signs, viral replication, and immune cell infiltration.
  • Assessing major histocompatibility complex (MHC) expression and T cell responses.

Main Results:

  • Cerebrospinal fluid inoculation led to rapid, fatal encephalitis within 8 days.

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  • Brain parenchyma inoculation resulted in prolonged viral replication without illness until spread to cerebrospinal fluid.
  • Intracerebral inflammation and T cell recruitment occurred but without antiviral antibody production.
  • Infiltrating T cells did not eliminate the virus in vivo or recognize it in vitro.

    • Conclusions:

    • Neurovirulent influenza virus can spread extensively in the brain parenchyma and induce inflammation.
    • The host immune response, including T cell infiltration, is insufficient to control viral replication or elicit protective immunity.
    • This highlights a critical gap in protective immunity against neuroinvasive influenza viruses.