RSV replication is attenuated by counteracting expression of the suppressor of cytokine signaling (SOCS) molecules

Virology. 2009 Sep 1;391(2):162-70. doi: 10.1016/j.virol.2009.06.026. Epub 2009 Jul 12.

Abstract

Human RSV causes an annual epidemic of respiratory tract illness in infants and in elderly. Mechanisms by which RSV antagonizes IFN-mediated antiviral responses include inhibition of type I IFN mRNA transcription and blocking signal transduction of JAK/STAT family members. The suppressor of cytokines signaling (SOCS) gene family utilizes a feedback loop to inhibit cytokine responses and block the activation of the JAK/STAT signaling pathway. To evaluate the potential of SOCS molecules to subvert the innate immune response to RSV infection, eight SOCS family genes were examined. RSV infection up-regulated SOCS1, SOCS3, and CIS mRNA expression in HEp-2 cells. Suppression of SOCS1, SOCS3 and CIS by short interfering ribonucleic acid (siRNA) inhibited viral replication. Furthermore, inhibition of SOCS1, SOCS3, or CIS activated type I IFN signaling by inducing STAT1/2 phosphorylation. These results suggest that RSV infection escapes the innate antiviral response by inducing SOCS1, SOCS3 or CIS expression in epithelial cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • Cytokines / antagonists & inhibitors*
  • Epithelial Cells / virology
  • Gene Expression Profiling
  • Gene Knockdown Techniques / methods
  • Gene Silencing
  • Humans
  • RNA, Small Interfering / genetics
  • Respiratory Syncytial Viruses / immunology*
  • Respiratory Syncytial Viruses / physiology*
  • Suppressor of Cytokine Signaling 1 Protein
  • Suppressor of Cytokine Signaling 3 Protein
  • Suppressor of Cytokine Signaling Proteins / biosynthesis*
  • Up-Regulation
  • Virus Replication*

Substances

  • Cytokines
  • RNA, Small Interfering
  • SOCS1 protein, human
  • SOCS3 protein, human
  • Suppressor of Cytokine Signaling 1 Protein
  • Suppressor of Cytokine Signaling 3 Protein
  • Suppressor of Cytokine Signaling Proteins
  • cytokine inducible SH2-containing protein