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Interferon- alpha and - beta restrict polyomavirus JC replication in primary human fetal glial cells: implications

Juliene K G Co1, Saguna Verma, Ulziijargal Gurjav

  • 1Retrovirology Research Laboratory, Department of Tropical Medicine, Medical Microbiology and Pharmacology, Asia-Pacific Institute of Tropical Medicine and Infectious Diseases, John A. Burns School of Medicine, Honolulu, HI 96813, USA.

The Journal of Infectious Diseases
|August 4, 2007
PubMed

Insights

Highly active antiretroviral therapy cannot stop JC polyomavirus (JCV) replication, which causes progressive multifocal leukoencephalopathy (PML). Interferon (IFN) inhibits JCV replication, suggesting intrathecal IFN as a potential adjunctive therapy for PML.

Area of Science:

  • Neurovirology
  • Immunology
  • Antiviral Therapy

Background:

  • Highly active antiretroviral therapy (HAART) is ineffective against JC polyomavirus (JCV) replication.
  • JCV causes progressive multifocal leukoencephalopathy (PML), an AIDS-defining illness.
  • Previous studies showed JCV induces interferon-stimulated genes (ISGs).

Purpose of the Study:

  • To identify viral events triggering ISG induction by JCV.
  • To evaluate type I interferon's antiviral effects on JCV replication in human fetal glial cells.
  • To assess the potential of interferon as an adjunctive therapy for PML.

Main Methods:

  • Characterization of specific JCV replication steps inducing ISGs.
  • Treatment of human fetal glial cells with type I interferons (IFNs) during JCV infection.
  • Neutralization of IFN activity with specific antibodies to assess its antiviral role.

Main Results:

  • Productive JCV replication is essential for inducing the antiviral host response (ISGs).
  • Type I IFN significantly inhibited JCV replication across all viral life cycle stages.
  • Neutralizing anti-IFN antibodies restored JCV replication, confirming IFN's direct antiviral effect.

Conclusions:

  • JCV replication is susceptible to type I IFN-mediated inhibition.
  • Interferon demonstrates potential as an adjunctive therapy for progressive multifocal leukoencephalopathy (PML).
  • Intrathecal administration of IFN is recommended due to its inability to cross the blood-brain barrier.

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