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Cytotoxic activity of Staphylococcus hyicus.
R P Allaker1, M Whitlock, D H Lloyd
1Department of Veterinary Medicine and Animal Husbandry, Royal Veterinary College, North Mymms, Herts, UK.
Veterinary Microbiology
|January 1, 1991
Summary
Staphylococcus hyicus strains produce cytotoxins that harm animal cells, with varying effects indicating virulence. This cytotoxin shares traits with Staphylococcus aureus delta haemolysin.
Area of Science:
- Microbiology
- Cell Biology
- Toxicology
Background:
- Staphylococcus hyicus is a bacterial species known to cause various infections in animals.
- The pathogenic mechanisms of S. hyicus, particularly the role of toxins, require further elucidation.
- Understanding bacterial toxins is crucial for developing effective treatments and control strategies.
Purpose of the Study:
- To investigate the cytotoxic effects of Staphylococcus hyicus culture supernatants on mammalian cells.
- To characterize the nature of the cytotoxic activity produced by S. hyicus.
- To compare the properties of the S. hyicus cytotoxin with known toxins from related species.
Main Methods:
- Exposure of murine fibroblast and porcine keratinocyte cell lines to culture supernatants from different S. hyicus strains.
- Assessment of cytotoxicity through cell viability assays.
- Purification of the cytotoxic factor from S. hyicus strain P119 using preparative isoelectric-focussing.
- Analysis of the purified cytotoxin's properties, including lytic, haemolytic, and proteolytic activity.
Main Results:
- Culture supernatants from various S. hyicus strains exhibited dose-dependent toxicity towards both murine fibroblasts and porcine keratinocytes.
- Significant differences in cytotoxic potency were observed among different S. hyicus strains, suggesting a correlation with virulence.
- The purified cytotoxin from S. hyicus strain P119 was found to be cytolytic and haemolytic.
- The cytotoxin was non-proteolytic, indicating a mechanism of action distinct from some other bacterial toxins.
Conclusions:
- Staphylococcus hyicus produces extracellular cytotoxins that can damage host cells.
- The observed strain-specific cytotoxicity suggests that toxin production is a key factor in S. hyicus virulence.
- The characterized cytotoxin shares properties with Staphylococcus aureus delta haemolysin, hinting at conserved toxin families within staphylococci.