Insights into the Staphylococcus aureus-host interface: global changes in host and pathogen gene expression in a rabbit skin infection model

PLoS One. 2015 Feb 26;10(2):e0117713. doi: 10.1371/journal.pone.0117713. eCollection 2015.

Abstract

Staphylococcus aureus is an important cause of human skin and soft tissue infections (SSTIs) globally. Notably, 80% of all SSTIs are caused by S. aureus, of which ∼63% are abscesses and/or cellulitis. Although progress has been made, our knowledge of the host and pathogen factors that contribute to the pathogenesis of SSTIs is incomplete. To provide a more comprehensive view of this process, we monitored changes in the S. aureus transcriptome and selected host proinflammatory molecules during abscess formation and resolution in a rabbit skin infection model. Within the first 24 h, S. aureus transcripts involved in DNA repair, metabolite transport, and metabolism were up-regulated, suggesting an increase in the machinery encoding molecules involved in replication and cell division. There was also increased expression of genes encoding virulence factors, namely secreted toxins and fibronectin and/or fibrinogen-binding proteins. Of the host genes tested, we found that transcripts encoding IL-8, IL1β, oncostatin M-like, CCR1, CXCR1 (IL8RA), CCL4 (MIP-1β) and CCL3 (MIP1α)-like proteins were among the most highly up-regulated transcripts during S. aureus abscess formation. Our findings provide additional insight into the pathogenesis of S. aureus SSTIs, including a temporal component of the host response. These results serve as a springboard for future studies directed to better understand how/why mild or moderate SSTIs progress to invasive disease.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Animals
  • Chemokines / genetics
  • Chemokines / metabolism
  • Female
  • Genome, Bacterial
  • Host-Pathogen Interactions*
  • Humans
  • Interleukins / genetics
  • Interleukins / metabolism
  • Rabbits
  • Staphylococcal Skin Infections / genetics
  • Staphylococcal Skin Infections / metabolism*
  • Staphylococcal Skin Infections / microbiology
  • Staphylococcus aureus / genetics*
  • Staphylococcus aureus / metabolism
  • Staphylococcus aureus / pathogenicity
  • Transcriptome*
  • Up-Regulation
  • Virulence Factors / genetics
  • Virulence Factors / metabolism

Substances

  • Chemokines
  • Interleukins
  • Virulence Factors