Surface properties of Staphylococcus aureus isolated from caprine mastitis

Area of Science:

• Veterinary Microbiology
• Bacterial Pathogenesis
• Molecular Biology

Background:

• Staphylococcus aureus is a significant pathogen causing mastitis in goats.
• Bacterial surface properties, such as hydrophobicity, play a crucial role in adhesion and infection.
• Understanding the factors contributing to S. aureus surface hydrophobicity is essential for developing control strategies.

Purpose of the Study:

• To investigate the surface hydrophobicity of Staphylococcus aureus strains isolated from caprine mastitis.
• To determine the correlation between surface hydrophobicity and the expression of surface Protein A (SpA).
• To assess the binding capacity of S. aureus to fibronectin, fibrinogen, and type II collagen.

Main Methods:

• Isolation and characterization of 53 Staphylococcus aureus strains from caprine mastitis cases.
• Measurement of bacterial surface hydrophobicity.
• Quantification of surface Protein A (SpA) expression.
• Assessment of binding to radiolabeled fibronectin (125I-fibronectin), fibrinogen, and type II collagen.

Main Results:

• A strong positive correlation was observed between surface hydrophobicity and SpA expression.
• Surface hydrophobicity was also strongly correlated with the binding of 125I-fibronectin.
• Fibrinogen binding was moderate, and type II collagen binding was low, irrespective of hydrophobicity levels.

Conclusions:

• Surface Protein A and fibronectin-binding proteins significantly contribute to the high surface hydrophobicity of S. aureus strains involved in caprine mastitis.
• These surface characteristics may enhance the adherence and persistence of S. aureus in the goat mammary gland.