Abstract
Staphylococcus epidermidis is a major nosocomial pathogen associated with infections of indwelling medical devices. One important virulence factor of these organisms is their ability to adhere to devices and form biofilms. In this study, we evaluated the effect of the ica operon on cell surface hydrophobicity, thermodynamics of adhesion, and biofilm formation for seven S. epidermidis strains. The surface free energy parameters of the bacterial cell surface and the substratum were determined by contact angle measurement. Biofilm formation was assayed using crystal violet staining. Results showed that ica-positive strains demonstrated a higher hydrophobic characteristic than ica-negative strains, suggesting that the ica-operon seems to determine the cell surface hydrophobicity of S. epidermidis. Interaction of ica-positive strains with a tissue-culture treated polystyrene surface was energetically favourable (ΔGTot < 0), in contrast to ica-negative strains (ΔGTot > 0). The interfacial free energy of aggregation of S. epidermidis was lower for ica-positive than for ica-negative strains. Our study suggests that, in addition to biofilm formation, adhesion and aggregation of clinical S. epidermidis is stimulated in ica-positive strains by influencing the thermodynamics of interaction.
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Acknowledgements
This work was performed in the Department of Biomedical Engineering, University Medical Center Groningen. The authors acknowledge all support provided by members of that department. TN was supported by Directorate General of Higher Education Ministry of Research, Technology and Higher Education of the Republic of Indonesia and a grant from the University Medical Center Groningen. BPK is supported by a Grant from the University of Amsterdam for research into the focal point ‘‘Oral Infections and Inflammation’’.
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Nuryastuti, T., Krom, B.P. Ica-status of clinical Staphylococcus epidermidis strains affects adhesion and aggregation: a thermodynamic analysis. Antonie van Leeuwenhoek 110, 1467–1474 (2017). https://doi.org/10.1007/s10482-017-0899-2
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DOI: https://doi.org/10.1007/s10482-017-0899-2