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Host cell caveolae act as an entry-port for group A streptococci.

Manfred Rohde1, Ellruth Müller, Gursharan S Chhatwal

  • 1Department of Microbial Pathogenicity and Vaccine Research, GBF-German Research Centre for Biotechnology, Mascheroder Weg 1, 38124 Braunschweig, Germany. mro@gbf.de

Cellular Microbiology
|April 26, 2003
PubMed
Summary
This summary is machine-generated.

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Group A Streptococcus bacteria use host cell caveolae for entry. The bacterial SfbI protein triggers this caveolae-mediated invasion pathway, preventing lysosomal fusion.

Area of Science:

  • Microbiology
  • Cell Biology
  • Infectious Diseases

Background:

  • Group A Streptococcus (GAS) is a significant human pathogen.
  • Understanding bacterial invasion mechanisms is crucial for developing targeted therapies.

Purpose of the Study:

  • To elucidate the entry mechanism of Group A Streptococcus into host cells.
  • To identify the role of host cell structures and bacterial factors in invasion.

Main Methods:

  • Scanning electron microscopy and ultrathin sectioning of infected epithelial and endothelial cells.
  • Immunofluorescence staining for caveolin-1 and endosomal/lysosomal markers.
  • Disruption of caveolae using methyl-beta-cyclodextrin and filipin.
  • Functional assays using non-invasive Streptococcus gordonii expressing SfbI and purified SfbI protein.

Related Experiment Videos

Main Results:

  • Caveolae were identified as entry points for GAS, forming omega-shaped invaginations.
  • Intracellular compartments, termed caveosomes, surrounded internalized streptococci and lacked endosomal markers.
  • Disruption of caveolae inhibited bacterial invasion, and streptococci within caveosomes avoided lysosomal fusion.
  • The streptococcal surface protein SfbI was identified as the key factor triggering caveolae-mediated invasion.

Conclusions:

  • Group A Streptococcus utilizes host cell caveolae for entry into epithelial and endothelial cells.
  • The streptococcal invasin SfbI protein activates a caveolae-mediated endocytic pathway, facilitating invasion and immune evasion.