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Conspicuous ingestion of Staphylococcus aureus organisms by murine fibroblasts in vitro
1Department of Bacteriology, Jikei University School of Medicine, Tokyo, Japan.
Abstract:
A conspicuous adhesion of Staphylococcus aureus organisms to murine cutaneous fibroblasts and NIH/3T3 cells cultured in vitro and subsequent ingestion of S. aureus organisms by these fibroblasts are described. In the present experimental system, only fibroblasts-adhering S. aureus organisms were efficiently ingested by fibroblasts unlike S. epidermidis and S. saprophyticus. These findings might suggest a correlation between the pathogenesis of S. aureus and its intracellular localization in non-professional phagocytes such as fibroblasts in a special reference to its higher pathogenicity than those of coagulase negative counterparts.
Insights
Staphylococcus aureus adheres to and is ingested by mouse fibroblasts, unlike other Staphylococcus species. This intracellular lifestyle may explain S. aureus
Area of Science:
- Microbiology
- Cell Biology
- Pathogenesis
Background:
- Staphylococcus aureus is a significant human pathogen.
- Understanding bacterial interactions with host cells is crucial for explaining pathogenesis.
- Fibroblasts are non-professional phagocytes that can internalize bacteria.
Purpose of the Study:
- To investigate the interaction between Staphylococcus aureus and murine fibroblasts in vitro.
- To compare the adherence and ingestion of S. aureus by fibroblasts with other Staphylococcus species.
- To explore the potential role of intracellular localization in S. aureus pathogenicity.
Main Methods:
- In vitro cell culture of murine cutaneous fibroblasts and NIH/3T3 cells.
- Exposure of fibroblast cultures to Staphylococcus aureus, S. epidermidis, and S. saprophyticus.
- Microscopic observation and analysis of bacterial adherence and intracellular uptake by fibroblasts.
Main Results:
- Conspicuous adhesion of Staphylococcus aureus to murine fibroblasts and NIH/3T3 cells was observed.
- Fibroblasts efficiently ingested S. aureus that adhered to their surface.
- S. epidermidis and S. saprophyticus showed significantly less adherence and ingestion by fibroblasts compared to S. aureus.
Conclusions:
- Fibroblasts actively internalize adhering Staphylococcus aureus.
- The ability of S. aureus to adhere to and be ingested by fibroblasts may contribute to its pathogenesis.
- Intracellular localization in non-professional phagocytes could be a factor in S. aureus' higher pathogenicity compared to coagulase-negative staphylococci.