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Streptococcus pyogenes clinical isolates and lipoteichoic acid.

O Leon1, C Panos

  • 1Department of Microbiology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107.

Infection and Immunity
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

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Virulent nephritogenic Streptococcus pyogenes strains exhibit distinct lipoteichoic acid (LTA) structures and increased adherence to human cells compared to non-nephritogenic strains. These LTA differences correlate with virulence in causing acute glomerulonephritis.

Area of Science:

  • Microbiology
  • Immunology
  • Cell Biology

Background:

  • Streptococcus pyogenes causes various infections, including acute glomerulonephritis.
  • Lipoteichoic acid (LTA) is a key surface component of Gram-positive bacteria, influencing host-pathogen interactions.
  • Differences in LTA structure and production may correlate with the virulence of S. pyogenes strains.

Purpose of the Study:

  • To investigate differences in lipoteichoic acid (LTA) production, secretion, and structure between nephritogenic and non-nephritogenic Streptococcus pyogenes clinical isolates.
  • To explore the relationship between LTA characteristics and bacterial adherence to, and cytotoxicity for, human skin cells in vitro.
  • To examine the effect of penicillin on LTA secretion by virulent S. pyogenes.

Main Methods:

Related Experiment Videos

  • Comparison of LTA from minimally subcultured clinical isolates of nephritogenic and non-nephritogenic S. pyogenes (serotype M18).
  • In vitro assays measuring bacterial adherence to and cytotoxicity for human skin cell monolayers.
  • Analysis of LTA structure, including polyglycerol phosphate chain length and composition.
  • Investigation of surface hydrophobicity and the effect of penicillin on LTA secretion.

    • Main Results:

    • Nephritogenic S. pyogenes M18 produced significantly more LTA than non-nephritogenic isolates.
    • LTAs from nephritogenic strains had longer polyglycerol phosphate chains and contained amino sugars, unlike those from non-nephritogenic strains.
    • Nephritogenic strains exhibited markedly higher adherence to and cytotoxicity for human skin cells compared to non-nephritogenic strains.
    • Penicillin exacerbated LTA secretion in virulent nephritogenic S. pyogenes M18.

    Conclusions:

    • Distinct LTA structures and increased LTA production in nephritogenic S. pyogenes correlate with enhanced adherence and cytotoxicity to human cells.
    • These LTA-mediated properties may contribute to the pathogenesis of acute glomerulonephritis caused by S. pyogenes.
    • LTA characteristics represent potential targets for therapeutic interventions against virulent S. pyogenes infections.