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Clot formation by group A streptococci

H Donabedian1, M D Boyle

  • 1Medical College of Ohio, Toledo, USA. hdonabedian@magnum.mco.edu

Infection and Immunity
|May 9, 1998
PubMed
Summary
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Group A Streptococcus causes plasma clots in low-nutrient conditions, but glucose prevents this. Glucose also lyses existing clots formed by wild-type bacteria, but not those from ska gene mutants.

Area of Science:

  • Microbiology
  • Bacteriology
  • Biochemistry

Background:

  • Group A Streptococcus (GAS) can induce human plasma clotting in specific environments.
  • This clotting phenomenon is influenced by nutrient availability and bacterial factors.

Purpose of the Study:

  • To investigate the role of glucose in Group A Streptococcus-induced plasma clot formation and lysis.
  • To determine the involvement of the ska gene in the clotting and lysis processes.

Main Methods:

  • Culturing Group A Streptococcus M serotypes in nutrient-poor media with and without glucose.
  • Observing clot formation and stability.
  • Inducing clot lysis using exogenous streptokinase, urokinase, or glucose.
  • Comparing lysis in wild-type and ska gene-inactivated mutant strains.

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Main Results:

  • Group A Streptococcus induced plasma clot formation in nutrient-poor media.
  • Glucose addition prevented clot formation and facilitated lysis of pre-formed clots.
  • Lysis by glucose was dependent on the presence of the ska gene, as mutant strains did not promote lysis.

Conclusions:

  • Glucose plays a dual role in regulating Group A Streptococcus-mediated plasma clotting: inhibition of formation and promotion of lysis.
  • The ska gene product is essential for glucose-induced clot lysis, highlighting its role in bacterial pathogenesis.