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Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
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Determining Immune System Suppression versus CNS Protection for Pharmacological Interventions in Autoimmune Demyelination
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Published on: September 12, 2016

Memory CD4+ T-cell-mediated protection from lethal coronavirus encephalomyelitis.

Carine Savarin1, Cornelia C Bergmann, David R Hinton

  • 1Department of Neurosciences, NC30, Lerner Research Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

Journal of Virology
|October 10, 2008
PubMed
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CD4(+) T cells control central nervous system (CNS) virus replication independently of perforin and gamma interferon (IFN-γ). However, IFN-γ is crucial for protection against fatal disease, despite CD4(+) T cells contributing to demyelination.

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Area of Science:

  • Immunology
  • Neurovirology
  • Central Nervous System (CNS) Pathologies

Background:

  • The role of CD4(+) T cells in CNS viral infections remains under-explored.
  • Control of neurotropic mouse hepatitis virus (JHMV) involves both CD4(+) and CD8(+) T cells.
  • CD8(+) T cells mediate direct antiviral activity via perforin and IFN-γ.

Purpose of the Study:

  • To investigate the specific antiviral contributions of CD4(+) T cells in JHMV-induced CNS pathology.
  • To differentiate between direct antiviral functions and bystander effects of CD4(+) T cells.
  • To assess the roles of perforin and IFN-γ in CD4(+) T cell-mediated viral clearance and neuropathology.

Main Methods:

  • Transfer of memory CD4(+) T cells from wild-type, perforin-deficient (PKO), and IFN-γ-deficient (GKO) donors to immunodeficient SCID mice.
  • Intracranial JHMV challenge in recipient mice.
  • Monitoring of viral replication, disease progression, survival, and demyelination.

Main Results:

  • All CD4(+) T cell populations (wt, PKO, GKO) controlled CNS viral replication independently of perforin and IFN-γ.
  • IFN-γ-deficient CD4(+) T cells led to more rapid fatal disease compared to controls.
  • Wild-type and PKO CD4(+) T cells cleared infectious virus and protected from death, but all populations caused demyelination, with wt CD4(+) T cells inducing more severe myelin loss.
  • IFN-γ reduced neutrophil accumulation and influenced macrophage localization but did not prevent demyelination.

Conclusions:

  • CD4(+) T cells possess significant IFN-γ- and perforin-independent antiviral functions in the CNS.
  • IFN-γ produced by CD4(+) T cells is critical for protection against fatal JHMV-induced CNS disease.
  • CD4(+) T cells contribute to demyelination in the CNS, with IFN-γ playing a role in modulating inflammatory cell infiltration and macrophage activity.