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Disruption of Erk-dependent type I interferon induction breaks the myxoma virus species barrier

Fuan Wang1, Yiyue Ma, John W Barrett

  • 1Robarts Research Institute, and Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario N6G 2V4, Canada.

Nature Immunology
|October 27, 2004
PubMed

Insights

Myxoma virus species barrier involves Erk-interferon-STAT1 signaling. This innate cellular pathway blocks poxvirus infection in non-rabbit cells, explaining why myxoma virus is lethal only in rabbits.

Area of Science:

  • Virology
  • Immunology
  • Cellular Biology

Background:

  • Myxoma virus causes lethal infections exclusively in rabbits.
  • The precise mechanism of this species-specific lethality remains unknown.
  • Understanding this barrier could inform poxvirus control strategies.

Purpose of the Study:

  • To elucidate the cellular mechanisms underlying the myxoma virus species barrier.
  • To identify host factors that restrict myxoma virus replication in non-permissive cells.
  • To investigate the role of specific signaling pathways in poxvirus host restriction.

Main Methods:

  • Infection of primary mouse embryo fibroblasts with myxoma virus.
  • Analysis of extracellular signal-regulated kinase (Erk) signaling pathway activation.
  • Assessment of interferon regulatory factor 3 (IRF3) and STAT1-mediated interferon signaling.
  • Evaluation of myxoma virus replication upon targeted inactivation of signaling components.
  • Determination of mouse susceptibility to myxoma virus following STAT1 deficiency.

Main Results:

  • Myxoma virus infection activated Erk signaling in mouse cells.
  • Erk signaling was linked to IRF3 activation and type I interferon induction.
  • Inactivating Erk or disrupting STAT1-mediated interferon signaling permitted myxoma virus replication.
  • STAT1-deficient mice exhibited increased susceptibility to lethal myxoma virus infection.

Conclusions:

  • The Erk-interferon-STAT1 signaling cascade forms an innate cellular barrier against myxoma virus in non-permissive cells.
  • This pathway explains the species-specific host range of myxoma virus.
  • Targeting this signaling pathway could offer insights into poxvirus pathogenesis and host interactions.

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