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Invasion of Human Cells by a Bacterial Pathogen
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Invasion of Human Cells by a Bacterial Pathogen

Published on: March 21, 2011

Pleiotropic virulence factor - Streptococcus pyogenes fibronectin-binding proteins.

Masaya Yamaguchi1, Yutaka Terao, Shigetada Kawabata

  • 1Department of Cell Membrane Biology, Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, 567-0047, Japan.

Cellular Microbiology
|November 30, 2012
PubMed
Summary
This summary is machine-generated.

Streptococcus pyogenes uses fibronectin-binding proteins to invade host cells and evade the immune system. These proteins are promising candidates for developing new vaccines against S. pyogenes infections.

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Area of Science:

  • Microbiology
  • Immunology
  • Molecular Biology

Background:

  • Streptococcus pyogenes causes various infections, from pharyngitis to necrotizing fasciitis.
  • Bacterial uptake by host cells is a crucial step in S. pyogenes pathogenesis.
  • Fibronectin-binding proteins (FnBPs) mediate S. pyogenes adherence and invasion.

Purpose of the Study:

  • To review the role of FnBPs in S. pyogenes pathogenesis.
  • To explore FnBPs as potential vaccine candidates.

Main Methods:

  • Review of structural analyses of S. pyogenes invasion mechanisms.
  • Analysis of FnBP interactions with fibronectin and host cell integrins.
  • Evaluation of FnBP roles in immune evasion and vaccine potential.

Main Results:

  • FnBPs facilitate S. pyogenes entry into epithelial and endothelial cells by bridging fibronectin to host α5 β1 -integrins.
  • FnBPs contribute to evading innate immunity, including complement and phagocytosis.
  • FnBPs are conserved among S. pyogenes serotypes and are potential non-M protein vaccine targets.

Conclusions:

  • FnBPs are critical for S. pyogenes invasion and immune evasion.
  • Targeting FnBPs offers a promising strategy for novel S. pyogenes vaccine development.