Early expression of SCIN and CHIPS drives instant immune evasion by Staphylococcus aureus

Suzan H.M. Rooijakkers*, Maartje Ruyken, Jos van Roon, Kok P.M. van Kessel, Jos A.G. van Strijp, Willem J.B. van Wamel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

120 Citations (Scopus)
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Abstract

Chemotaxis inhibitory protein of staphylococci (CHIPS) and Staphylococcal complement inhibitor (SCIN) are small, excreted molecules that play a crucial role in the staphylococcal defence against the human innate immune system. Here we show that they both counteract crucial acute responses of our immune system such as complement activation, neutrophil chemotaxis and neutrophil activation. By studying gene expression via promoter-green fluorescent protein fusions, Northern blots and protein expression analyses, we show that SCIN and CHIPS are produced during the early (exponential) growth stages. Although the SCIN and CHIPS genes are expressed simultaneously, they are differently regulated by various Staphylococcus aureus regulatory loci. However, the sae locus is crucial for upregulation of both SCIN and CHIPS. This is the first study that presents the expression of two extracellular S. aureus proteins early during growth. Because SCIN and CHIPS are both efficient modulators of neutrophil chemotaxis, phagocytosis and killing, their early expression is necessary for efficient modulation of the early immune response.

Original languageEnglish
Pages (from-to)1282-1293
Number of pages12
JournalCellular Microbiology
Volume8
Issue number8
DOIs
Publication statusPublished - Aug 2006
Externally publishedYes

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