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Capsule-like structures in Clostridium difficile strains.

L Baldassarri1, G Donelli, M Cerquetti

  • 1Laboratorio di Ultrastrutture, Istituto Superiore di Sanità, Rome, Italy.

Microbiologica
|October 1, 1991
PubMed
Summary
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Clostridium difficile strains possess a glucose-induced surface layer. Strains linked to disease show thicker capsules than those from healthy children, but this layer isn't adhesive.

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Surface Ultrastructure

Background:

  • Clostridium difficile is a significant cause of infectious diarrhea.
  • Understanding C. difficile surface structures is crucial for elucidating its pathogenesis.
  • Previous characterization of strains involved SDS-PAGE.

Purpose of the Study:

  • To investigate the surface structures of Clostridium difficile strains.
  • To differentiate surface characteristics between disease-associated and commensal strains.
  • To assess the potential role of surface layers in adhesion.

Main Methods:

  • Examination of fourteen Clostridium difficile strains using electron microscopy.
  • Ruthenium red staining to visualize polysaccharide layers.

Related Experiment Videos

  • Ultrathin sectioning and analysis of surface structures.
  • Treatment with homologous and heterologous antisera.

    • Main Results:

    • No fimbriae were detected in any strain.
    • All strains exhibited a thin ruthenium red-positive layer when grown with glucose.
    • Disease-associated strains (group 2) displayed a 30-80nm thick capsule.
    • Commensal strains (group 5) showed a thinner polysaccharide layer (10-20 nm).
    • No stabilization with antisera was observed.

    Conclusions:

    • Clostridium difficile produces a glucose-dependent surface polysaccharide layer.
    • Capsule thickness varies between strains, correlating with disease association.
    • The observed capsule-like material does not appear to mediate adhesion.