Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla
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 ge...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2019-01-01
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| Series: | Virulence |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/21505594.2019.1620062 |
| _version_ | 1818316617783705600 |
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| author | Cecilia Johansson Hilpi Rautelin René Kaden |
| author_facet | Cecilia Johansson Hilpi Rautelin René Kaden |
| author_sort | Cecilia Johansson |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T09:24:17Z |
| format | Article |
| id | doaj.art-ccaefcc6c9184746a80ad44c74d96cb9 |
| institution | Directory Open Access Journal |
| issn | 2150-5594 2150-5608 |
| language | English |
| last_indexed | 2024-12-13T09:24:17Z |
| publishDate | 2019-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Virulence |
| spelling | doaj.art-ccaefcc6c9184746a80ad44c74d96cb92022-12-21T23:52:40ZengTaylor & Francis GroupVirulence2150-55942150-56082019-01-0110150251010.1080/21505594.2019.16200621620062Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin HlaCecilia Johansson0Hilpi Rautelin1René Kaden2Uppsala UniversityUppsala UniversityUppsala UniversityStaphylococcus 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.http://dx.doi.org/10.1080/21505594.2019.1620062staphylococcus argenteusstaphylococcus schweitzeristaphylococcus aureusvirulencetoxinalpha-hemolysinhlaagrquorum sensing |
| spellingShingle | Cecilia Johansson Hilpi Rautelin René Kaden Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla Virulence staphylococcus argenteus staphylococcus schweitzeri staphylococcus aureus virulence toxin alpha-hemolysin hla agr quorum sensing |
| title | Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla |
| title_full | Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla |
| title_fullStr | Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla |
| title_full_unstemmed | Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla |
| title_short | Staphylococcus argenteus and Staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha-hemolysin Hla |
| title_sort | staphylococcus argenteus and staphylococcus schweitzeri are cytotoxic to human cells in vitro due to high expression of alpha hemolysin hla |
| topic | staphylococcus argenteus staphylococcus schweitzeri staphylococcus aureus virulence toxin alpha-hemolysin hla agr quorum sensing |
| url | http://dx.doi.org/10.1080/21505594.2019.1620062 |
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