Adherence of four strains of Staphylococcus aureus to eukaryotic cell monolayers was assayed with [3H]-thymidine labelled bacterial cells and the results were analysed by non-parametric statistical tests. Adherence to primary (human mesothelial) and semi-continuous (human embryonic lung) cell monolayers was significantly better than to continuous cell lines (HEp2, HeLa and Vero). HEp2 cell monolayers provided the most reliable assay substrate of the continuous cell lines tested. Variation occurred between bacterial culture batches but the assay measured significant differences between adhesion levels of the strains and distinguished between high level (RN92, 8325-4) and low level (Wood46, ISP458) adhering strains. Adherence to different batches of cell monolayers also varied but relative adherence values for strains were similar and the ranking of strains according to adhesion values was unchanged. Potential adhesion mediators have been monitored for their effect on adhesion of a highly adherent strain (RN92) to HEp2 monolayers. Fibronectin, protein A and anti-protein A did not significantly affect adhesion. Lipoteichoic acid caused a significant inhibition of adhesion. With critical statistical analysis to accommodate inherent variations, this assay provides a useful model to study factors involved in adherence of Staph. aureus to eukaryotic cells.
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