Staphylococcus aureus lipoproteins augment inflammatory responses in poly I:C-primed macrophages

Seok Seong Kang, A. Reum Kim, Cheol Heui Yun, Seung Hyun Han

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Secondary bacterial infection contributes to severe inflammation following viral infection. Among foodborne pathogenic bacteria, Staphylococcus aureus is known to exacerbate severe inflammatory responses after infection with single-stranded RNA viruses such as influenza viruses. However, it has not been determined if S. aureus infection enhances inflammatory responses after infection with RNA enteric viruses, including rotavirus, which is a double-stranded RNA virus. We therefore investigated the molecular mechanisms by which a cell wall component of S. aureus enhanced inflammatory responses during enteric viral infection using poly I:C-primed macrophages, which is a well-established model for double-stranded RNA virus infection. S. aureus lipoproteins enhanced IL-6 as well as TNF-α production in poly I:C-primed macrophages. Pam2CSK4, a mimic of Gram-positive bacterial lipoproteins and S. aureus lipoproteins, also significantly enhanced IL-6 production in poly I:C-primed macrophages. While IFN-β expression was increased in poly I:C-primed macrophages treated with Pam2CSK4 or S. aureus lipoproteins, the level of IL-6 enhancement in poly I:C-primed macrophages was decreased in the presence of anti-IFN-α/β receptor antibody, suggesting that IFN-β plays an important role in enhanced IL-6 production. Phosphatidylinositol-3-kinase, Akt, ERK and NF-κB were also involved in the enhanced IL-6 production. Collectively, these results suggest that S. aureus lipoproteins induce excessive inflammatory responses in the presence of poly I:C.

Original languageEnglish
Pages (from-to)154-161
Number of pages8
JournalCytokine
Volume111
DOIs
StatePublished - Nov 2018

Keywords

  • Inflammation
  • Lipoproteins
  • Secondary infection
  • Staphylococcus aureus
  • Viral infection

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