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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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Type I Interferons Direct Gammaherpesvirus Host Colonization.

Cindy S E Tan1, Clara Lawler1, Janet S May2

  • 1School of Chemistry and Molecular Biosciences, University of Queensland and Royal Children's Hospital, Brisbane, Australia.

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Summary
This summary is machine-generated.

Type I interferons (IFN-I) differentially impact gamma-herpesvirus infection based on cell type. Viral evasion strategies are crucial for navigating IFN-I responses and establishing chronic B cell infections.

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Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Gamma-herpesviruses establish lifelong infections in lymphocytes.
  • Murid herpesvirus-4 (MuHV-4) employs an epithelial-to-myeloid-to-lymphoid transmission route.
  • Type I interferons (IFN-I) are key antiviral mediators, while viral evasion mechanisms counteract them.

Purpose of the Study:

  • To investigate the cell-type-specific roles of IFN-I and viral evasion in controlling MuHV-4 infection.
  • To understand how IFN-I responses and viral countermeasures influence viral replication and dissemination.
  • To elucidate the mechanisms by which herpesviruses colonize host cells.

Main Methods:

  • Utilized Mx1-cre reporter mice to track viral genomes in IFN-I-responding cells.
  • Manipulated viral evasion strategies and IFN-I signaling pathways.
  • Administered poly(I:C) to induce IFN-I responses.
  • Analyzed viral replication and dissemination in different cell types (epithelial, myeloid, lymphoid).

Main Results:

  • Epithelial-derived MuHV-4 showed limited IFN-I exposure and replication.
  • IFN-I suppressed MuHV-4 replication in macrophages but not B cells.
  • Viral evasion was essential for B cell infection despite IFN-I presence.
  • Blocking IFN-I signaling facilitated lytic spread between macrophages.
  • MuHV-4 shifted from lytic myeloid infection to latent B cell infection, influenced by IFN-I and evasion.

Conclusions:

  • The impact of IFN-I on herpesvirus replication is highly cell-type-dependent.
  • Viral evasion strategies are critical for overcoming IFN-I-mediated immunity in specific cell types, particularly B cells.
  • Herpesviruses possess mechanisms to transit through IFN-I-responsive cells, a potentially conserved feature for host colonization.