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Pathogenesis of Borna disease

L Stitz1, T Bilzer, J A Richt

  • 1Institut für Virologie, Justus-Liebig-Universität, Giessen, Federal Republic of Germany.

Archives of Virology. Supplementum
|January 1, 1993
PubMed
Summary

Borna disease, a brain inflammation in animals, is caused by the host's immune response to the virus, not the virus itself. This immune reaction leads to neurological disorders and brain atrophy.

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Area of Science:

  • Neuroimmunology
  • Viral Pathogenesis
  • Immunopathology

Background:

  • Borna disease is a naturally occurring viral encephalomyelitis in horses and sheep.
  • Experimental models, particularly in rats, reveal similar pathogenic pathways and neurological disorders.
  • The disease manifests as classical encephalitis or behavioral alterations.

Purpose of the Study:

  • To elucidate the role of virus-specific CD4+ and CD8+ T cells in the pathogenesis of acute Borna disease.
  • To provide evidence for the involvement of CD8+ T cells in chronic Borna disease-induced brain atrophy.
  • To highlight Borna disease as a model for studying immune-mediated brain diseases and dementia.

Main Methods:

  • Utilizing experimental animal models (rats) for Borna disease studies.
  • Investigating the role of CD4+ T cells using a cultured T cell line.
  • Employing immunomodulatory substances and antibody treatments to study CD8+ T cell function in vivo.

Main Results:

  • Virus-specific CD4+ and CD8+ T cells are crucial in the pathogenesis of acute Borna disease.
  • Virus-specific CD8+ T cells are implicated in the brain atrophy observed in the chronic phase of Borna disease in rats.
  • The clinical manifestations are driven by the host's immune response to the Borna virus.

Conclusions:

  • Borna disease pathogenesis is primarily mediated by a virus-induced cell-mediated immunopathological reaction.
  • The disease serves as a valuable model for understanding immune-mediated brain diseases, including those leading to dementia.
  • CD8+ T cells play a significant role in both acute and chronic phases of Borna disease, including tissue destruction and atrophy.

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