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Influence of mucin on serum and connective tissue protein binding to Staphylococcus aureus isolated from nasal

O Olusanya1, A S Naidu

  • 1Department of Pathology, Ogun State University, Nigeria.

African Journal of Medicine and Medical Sciences
|June 1, 1991
PubMed

Insights

Staphylococcus aureus nasal isolates bind more to fibronectin and collagens than clinical strains. Mucin significantly reduces this bacterial binding, suggesting a role in staphylococcal adhesion and colonization.

Area of Science:

  • Microbiology
  • Bacterial Adhesion
  • Host-Pathogen Interactions

Background:

  • Staphylococcus aureus is a significant human pathogen.
  • Bacterial adhesion to host tissues is crucial for colonization and infection.
  • Understanding the molecular interactions between S. aureus and host matrix proteins is essential.

Purpose of the Study:

  • To investigate the binding characteristics of Staphylococcus aureus strains to host matrix proteins.
  • To determine the effect of mucin on the adhesion of S. aureus to fibronectin, collagens, and laminin.
  • To explore the role of mucin in the pathomechanism of staphylococcal adhesion.

Main Methods:

  • Testing 89 Staphylococcus aureus strains for binding to [125I]-labelled fibronectin (Fn), type I (Cn-I), type II (Cn-II), type IV (Cn-IV) collagens, and laminin (Lm).
  • Comparing binding affinities between nasal carriage isolates and clinical isolates.
  • Preincubation of bacterial strains with mucin to assess its inhibitory effect on protein binding.
  • Evaluating mucin concentration-dependent decrease in protein binding using a specific S. aureus strain (Nig-6).

Main Results:

  • Nasal carriage isolates of S. aureus showed a higher degree of interaction with Fn, Cn-I, Cn-IV, and Lm compared to clinical isolates.
  • Preincubation with mucin significantly reduced the binding of nasal carriage isolates to Fn (39.4%), Cn-I (44.7%), Cn-IV (42.0%), and Lm (43.5%).
  • Mucin demonstrated a concentration-dependent decrease in the binding of S. aureus to serum and connective tissue proteins, with specific concentrations causing 50% displacement of labelled proteins.

Conclusions:

  • Mucin significantly inhibits the binding of Staphylococcus aureus to key host matrix proteins.
  • These findings suggest that mucin plays a crucial role in modulating staphylococcal adhesion and colonization.
  • The interaction between mucin and bacterial cells is likely important in the pathomechanism of staphylococcal infections.

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