Cutting edge: innate immune response triggered by influenza A virus is negatively regulated by SOCS1 and SOCS3 through a RIG-I/IFNAR1-dependent pathway

J Immunol. 2008 Feb 15;180(4):2034-8. doi: 10.4049/jimmunol.180.4.2034.

Abstract

Influenza A virus (IAV) triggers a contagious respiratory disease that produces considerable lethality. Although this lethality is likely due to an excessive host inflammatory response, the negative feedback mechanisms aimed at regulating such a response are unknown. In this study, we investigated the role of the eight "suppressor of cytokine signaling" (SOCS) regulatory proteins in IAV-triggered cytokine expression in human respiratory epithelial cells. SOCS1 to SOCS7, but not cytokine-inducible Src homology 2-containing protein (CIS), are constitutively expressed in these cells and only SOCS1 and SOCS3 expressions are up-regulated upon IAV challenge. Using distinct approaches affecting the expression and/or the function of the IFNalphabeta receptor (IFNAR)1, the viral sensors TLR3 and retinoic acid-inducible gene I (RIG-I) as well as the mitochondrial antiviral signaling protein (MAVS, a RIG-I signaling intermediate), we demonstrated that SOCS1 and SOCS3 up-regulation requires a TLR3-independent, RIG-I/MAVS/IFNAR1-dependent pathway. Importantly, by using vectors overexpressing SOCS1 and SOCS3 we revealed that while both molecules inhibit antiviral responses, they differentially modulate inflammatory signaling pathways.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bronchi / cytology
  • Bronchi / immunology
  • Bronchi / metabolism
  • Bronchi / virology
  • Cell Line
  • DEAD Box Protein 58
  • DEAD-box RNA Helicases / physiology*
  • Humans
  • Immunity, Innate*
  • Influenza A Virus, H3N2 Subtype / immunology*
  • Receptor, Interferon alpha-beta / physiology*
  • Receptors, Immunologic
  • Respiratory Mucosa / cytology
  • Respiratory Mucosa / immunology
  • Respiratory Mucosa / metabolism
  • Respiratory Mucosa / virology
  • Signal Transduction / immunology*
  • Suppressor of Cytokine Signaling 1 Protein
  • Suppressor of Cytokine Signaling 3 Protein
  • Suppressor of Cytokine Signaling Proteins / biosynthesis
  • Suppressor of Cytokine Signaling Proteins / genetics
  • Suppressor of Cytokine Signaling Proteins / physiology*
  • Toll-Like Receptor 3 / physiology
  • Up-Regulation / immunology

Substances

  • IFNAR1 protein, human
  • Receptors, Immunologic
  • SOCS1 protein, human
  • SOCS3 protein, human
  • Suppressor of Cytokine Signaling 1 Protein
  • Suppressor of Cytokine Signaling 3 Protein
  • Suppressor of Cytokine Signaling Proteins
  • TLR3 protein, human
  • Toll-Like Receptor 3
  • Receptor, Interferon alpha-beta
  • RIGI protein, human
  • DEAD Box Protein 58
  • DEAD-box RNA Helicases