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Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Clinical Microbiology.ORCID iD: 0000-0001-5965-2853
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Clinical Microbiology.ORCID iD: 0000-0002-9692-8473
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Clinical Microbiology.ORCID iD: 0000-0002-2111-9751
2019 (English)In: Virulence, ISSN 2150-5594, E-ISSN 2150-5608, Vol. 10, no 1, p. 502-510Article in journal (Refereed) Published
Abstract [en]

Staphylococcus argenteus and Staphylococcus schweitzeri are newly identified species of the S. aureus-related complex. S. argenteus, as occurring globally and showing significant prevalence and comparable infection and morbidity rates compared to S. aureus, is becoming clinically important. Whole genome sequencing has revealed the presence of several virulence genes but the molecular mechanisms of S. argenteus infection and virulence are largely unknown. Here, we studied the effect of a previously characterized clinical S. argenteus isolate on human cells in vitro. The clinical isolate, together with the S. argenteus type strain MSHR1132T and the S. schweitzeri type strain FSA084T, had a cytotoxic effect on the cells, which showed necrotic cell death after a few hours of treatment. The protein causing the cytotoxic effect was purified and identified by mass spectrometry as alpha-hemolysin, Hla, which is awell-known pore-forming toxin in S.aureus. The cytotoxic effect could be blocked with an antibody against Hla. S.argenteus showed 12-15 fold higher expression levels of hla at the RNA level and 4-6 fold higher expression levels at the protein level compared to S.aureus. The higher expression levels of hla were supported by higher RNA levels of the regulatory factors sarA and saeR. Also, the RNAIII component of the accessory gene regulator (agr) quorum sensing system was 8,000-10,000 fold higher in the S.argenteus isolates compared to S.aureus. This is the first study on the effect of S.argenteus on ahuman cell line and strengthens the idea of significant virulence of S.argenteus.

Place, publisher, year, edition, pages
Taylor & Francis, 2019. Vol. 10, no 1, p. 502-510
Keywords [en]
agr, alpha-hemolysin, hla, quorum sensing, toxin, virulence
National Category
Microbiology in the medical area Infectious Medicine
Identifiers
URN: urn:nbn:se:uu:diva-384415DOI: 10.1080/21505594.2019.1620062ISI: 000468970700001PubMedID: 31131704OAI: oai:DiVA.org:uu-384415DiVA, id: diva2:1320514
Available from: 2019-06-05 Created: 2019-06-05 Last updated: 2019-06-24Bibliographically approved

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