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Expression of slime interferes with in vitro detection of host protein receptors of Staphylococcus epidermidis
L Baldassarri1, G Donelli, A Gelosia
1Laboratorio di Ultrastrutture, Istituto Superiore di Sanità, Rome, Italy.
Abstract:
We hypothesized that slime may mask bacterial molecules important in the attachment of Staphylococcus epidermidis to inanimate surfaces. In support of this hypothesis, we found that slime-negative strains attached significantly better to fibrinogen or fibronectin than the parent strains and exhibited greater surface hydrophobicity. Comparable results were obtained with 53 clinical isolates.
Insights
Slime masks bacterial molecules, hindering Staphylococcus epidermidis attachment to surfaces. Slime-negative strains showed significantly better attachment and increased surface hydrophobicity, confirmed in clinical isolates.
Area of Science:
- Microbiology
- Biomaterials Science
Background:
- Staphylococcus epidermidis is a common cause of implant-associated infections.
- Bacterial attachment to medical devices is a critical step in biofilm formation.
- The role of bacterial slime in adhesion to abiotic surfaces requires further elucidation.
Purpose of the Study:
- To investigate the hypothesis that bacterial slime masks adhesins involved in Staphylococcus epidermidis surface attachment.
- To determine the effect of slime production on the adhesion of S. epidermidis to host matrix proteins.
Main Methods:
- Comparison of slime-positive and slime-negative Staphylococcus epidermidis strains for surface attachment.
- Assessment of surface hydrophobicity in relation to slime production.
- Evaluation of attachment to fibrinogen and fibronectin.
Main Results:
- Slime-negative S. epidermidis strains demonstrated significantly enhanced attachment to fibrinogen and fibronectin compared to parent strains.
- A notable increase in surface hydrophobicity was observed in slime-negative strains.
- These findings were consistent across 53 diverse clinical isolates.
Conclusions:
- Bacterial slime plays a crucial role in modulating Staphylococcus epidermidis adhesion to abiotic surfaces.
- Slime production appears to mask key bacterial surface molecules, reducing initial attachment.
- Targeting slime production could be a potential strategy to prevent S. epidermidis infections.