Related Experiment Videos
[The hydrophobicity of Streptococcus pyogenes as a possible marker of its virulence]
Abstract:
The hydrophobicity of 366 S. pyogenes cultures isolated from the pharynx of tonsillitis and scarlet fever patients and healthy children, as well as museum strain of type M29, was studied. The study revealed that the hydrophobicity of cultures isolated from scarlet fever patients exceeded that of cultures isolated from healthy carriers and tonsillitis patients. Among S. pyogenes cultures isolated in cases of prolonged carriership a considerable proportion of highly hydrophobic cultures was detected, which was probably indicative of an important role played by the hydrophobicity of streptococci in retaining them on the barrier epithelium. This was confirmed by the presence of correlation between the hydrophobicity of culture of S. pyogenes, type M29, and its adhesion to the fibronectin receptor and HEp-2 cells. For S. pyogenes of type M6, epidemic in the group of children under observation during the period of 1987-1988, the values characterizing its hydrophobicity were registered which significantly exceeded average hydrophobicity values. At the period of a rise in morbidity S. pyogenes cultures were characterized by significantly higher hydrophobicity. The variability of the hydrophobicity index and its relationship with the dissociation of cultures were established. The hydrophobicity index may be used as one of the virulence markers of S. pyogenes strains.
Insights
Increased bacterial hydrophobicity in Streptococcus pyogenes (S. pyogenes) correlates with scarlet fever and prolonged carriage. This surface property may indicate higher virulence and aid bacterial adhesion.
Area of Science:
- Microbiology
- Infectious Diseases
- Bacterial Pathogenesis
Background:
- Streptococcus pyogenes (S. pyogenes) is a significant human pathogen.
- Understanding bacterial surface properties like hydrophobicity is crucial for elucidating infection mechanisms.
Purpose of the Study:
- To investigate the role of S. pyogenes hydrophobicity in relation to clinical outcomes.
- To determine if hydrophobicity can serve as a virulence marker.
Main Methods:
- Studied hydrophobicity of 366 S. pyogenes cultures from various patient groups and a museum strain.
- Correlated hydrophobicity with clinical conditions (tonsillitis, scarlet fever, healthy carriers, prolonged carriage).
- Assessed adhesion of S. pyogenes to fibronectin receptor and HEp-2 cells in relation to hydrophobicity.
Main Results:
- S. pyogenes from scarlet fever patients exhibited higher hydrophobicity than those from healthy carriers or tonsillitis patients.
- Highly hydrophobic S. pyogenes strains were prevalent in prolonged carriers, suggesting a role in epithelial retention.
- A positive correlation was found between hydrophobicity and adhesion to fibronectin receptor and HEp-2 cells for M29 strains.
- Epidemic M6 strains and strains during morbidity peaks showed significantly increased hydrophobicity.
Conclusions:
- Bacterial hydrophobicity is elevated in S. pyogenes associated with scarlet fever and prolonged carriage.
- Hydrophobicity appears to play a role in S. pyogenes adherence to host tissues.
- The hydrophobicity index shows potential as a virulence marker for S. pyogenes strains.