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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

CD200R1 supports HSV-1 viral replication and licenses pro-inflammatory signaling functions of TLR2

Roy J Soberman1, Christopher R MacKay, Christine A Vaine

  • 1Renal Unit, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts, USA. Soberman@helix.mgh.harvard.edu

Plos One
|October 20, 2012
PubMed

Insights

The CD200 receptor 1 (CD200R1) surprisingly licenses Toll-like receptor 2 (TLR2) signaling, impacting macrophage responses to herpes simplex virus 1 (HSV-1) infection. CD200R1 deficiency protects mice from HSV-1 by impairing viral replication and TLR2-mediated inflammation.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • The CD200R1:CD200 axis traditionally limits inflammation by suppressing myeloid cell pro-inflammatory signaling.
  • Toll-like receptor 2 (TLR2) plays a critical role in host defense against pathogens like herpes simplex virus 1 (HSV-1).
  • The precise role of CD200R1 in TLR2-mediated immune responses and viral infections remains largely unexplored.

Purpose of the Study:

  • To investigate the function of CD200R1 in regulating macrophage signaling through TLR2.
  • To determine the role of CD200R1 in the host response to TLR2-dependent HSV-1 infection.
  • To elucidate the impact of CD200R1 deficiency on viral replication and immune cell activation.

Main Methods:

  • Generation and analysis of CD200R1 knockout (CD200R1(-/-)) mice.
  • Assessment of peritoneal macrophage responses to TLR2 agonists and HSV-1 ex vivo.
  • In vivo evaluation of host response and viral replication in CD200R1(-/-) mice following HSV-1 infection.

Main Results:

  • CD200R1(-/-) macrophages showed significantly reduced IL-6 and CCL5 production upon stimulation with a TLR2 agonist and HSV-1.
  • Absence of CD200R1 impaired TLR2 expression upregulation and inflammasome assembly in response to HSV-1.
  • CD200R1(-/-) mice were protected from HSV-1 infection, exhibiting impaired TLR2 signaling and reduced viral replication in various cell types.

Conclusions:

  • CD200R1 plays a novel and essential role in licensing pro-inflammatory functions of TLR2.
  • CD200R1 is required for supporting efficient viral replication, particularly for HSV-1.
  • These findings reveal an unexpected function of CD200R1 in modulating innate immunity and antiviral defense.

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