Interactions with fibronectin attenuate the virulence of Streptococcus pyogenes

Patrik Nyberg, Takao Sakai, Kyu Hong Cho, Michael G. Caparon, Reinhard Fässler, Lars Björck

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Fibronectin-binding surface proteins are found in many bacterial species. Most strains of Streptococcus pyogenes, a major human pathogen, express the fibronectin-binding protein F1, which promotes bacterial adherence to and entry into human cells. In this study, the role of fibronectin in S. pyogenes virulence was investigated by introducing the protein F1 gene in an S. pyogenes strain lacking this gene. Furthermore, transgenic mice lacking plasma fibronectin were used to examine the relative contribution of plasma and cellular fibronectin to S. pyogenes virulence. Unexpectedly, protein F1-expressing bacteria were less virulent to normal mice, and virulence was partly restored when these bacteria were used to infect mice lacking plasma fibronectin. Dissemination to the spleen of infected mice was less efficient for fibronectin-binding bacteria. These bacteria also disseminated more efficiently in mice lacking plasma fibronectin, demonstrating that plasma fibronectin bound to the bacterial surface downregulates S. pyogenes virulence by limiting bacterial spread. From an evolutionary point of view, these results suggest that reducing virulence by binding fibronectin adds selective advantages to the bacterium.

Original languageEnglish
Pages (from-to)2166-2174
Number of pages9
JournalEMBO Journal
Volume23
Issue number10
DOIs
StatePublished - May 19 2004

Keywords

  • Adherence
  • Fibronectin
  • Internalisation
  • S. pyogenes
  • Virulence

Fingerprint

Dive into the research topics of 'Interactions with fibronectin attenuate the virulence of Streptococcus pyogenes'. Together they form a unique fingerprint.

Cite this