Adherence of peritonitis-causing staphylococci to human peritoneal mesothelial cell monolayers

Area of Science:

• Microbiology
• Cell Biology
• Immunology

Background:

• Staphylococci are common bacteria that can cause infections.
• Understanding bacterial adherence to host cells is crucial for infection control.
• Human mesothelial cells line body cavities and can be a site for staphylococcal infections.

Purpose of the Study:

• To investigate the adherence patterns of Staphylococcus aureus and Staphylococcus epidermidis to human mesothelial cells.
• To identify specific bacterial surface components involved in staphylococcal adherence.

Main Methods:

• Co-culturing staphylococci with human mesothelial cell monolayers.
• Quantifying bacterial adherence to cells and plastic surfaces.
• Assessing the role of bacterial cell wall components (protein A, lipoteichoic acid, teichoic acid, peptidoglycan) and host factors (serum albumin, gelatin) in adherence.
• Utilizing mutant strains deficient in specific cell wall components.

Main Results:

• Staphylococcus aureus showed significantly higher adherence to mesothelial cells compared to plastic (3.4-fold increase).
• Staphylococcus epidermidis exhibited significantly lower adherence to mesothelial cells compared to plastic (3.0-fold decrease).
• Bacterial adherence was significantly inhibited by lipoteichoic acid, teichoic acid, and protein A, but not peptidoglycan.
• Mutants lacking protein A or teichoic acid demonstrated reduced adherence.
• Encapsulated Staphylococcus epidermidis strains adhered well to mesothelial cells.

Conclusions:

• Staphylococcal adherence to human mesothelial cells is species-specific and influenced by bacterial surface components.
• Lipoteichoic acid, teichoic acid, and protein A are important mediators of Staphylococcus adherence.
• The findings provide insights into the mechanisms of staphylococcal colonization and infection.