3 years ago

The ability of Group A streptococcus to adhere to immortalized human skin versus throat cell lines does not reflect their predicted tissue tropism

To determine if emm pattern-inferred tissue tropisms of Group A streptococcus strains is reflected in their ability to adhere to immortalized human HaCat (keratinocyte) and Detroit 562 (pharyngeal) cell lines. Methods Human epithelial cell line monolayers were inoculated with Group A streptococcus, and the percentage of adhered bacteria after a 1-h incubation period was calculated. Results Of the 21/69 inferred-skin-tropic, and the 25/69 inferred-throat-tropic isolates no preferential adherence was observed to a particular cell line. The 23/69 strains classified as ‘generalists’, however, showed an overall greater ability to adhere to both cell lines. Conclusions Predicted tissue-tropism based on emm patterns is not reflected by preferential adherence to a specific cell line, suggesting that early adhesion events may not be as important in establishing infection at a particular ecological niche than originally expected.

Publisher URL: www.sciencedirect.com/science

DOI: S1198743X17301775

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