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Intracellular Staphylococcus aureus induces apoptosis in mouse osteoblasts
K A Tucker1, S S Reilly, C S Leslie
1Department of Biology, University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, USA.
FEMS Microbiology Letters
|May 10, 2000
Summary
Staphylococcus aureus infection triggers apoptosis, or programmed cell death, in osteoblasts. This study confirms Staphylococcus aureus induces osteoblast apoptosis, a key factor in osteomyelitis development.
Area of Science:
- Microbiology
- Cell Biology
- Pathology
Background:
- Staphylococcus aureus is a primary pathogen causing osteomyelitis.
- Bacterial invasion of osteoblasts is a critical step in bone infection pathogenesis.
Purpose of the Study:
- To investigate the capacity of Staphylococcus aureus to induce apoptosis in a mouse osteoblast cell line.
- To elucidate the cellular mechanisms by which S. aureus affects osteoblast viability.
Main Methods:
- Transmission electron microscopy to confirm intracellular bacterial presence.
- Light microscopy to observe morphological changes in infected osteoblasts.
- DNA electrophoresis and in situ cell death detection assays to identify apoptosis.
Main Results:
- Intracellular Staphylococcus aureus was visualized within osteoblasts.
- Morphological changes, including cell rounding and chromatin condensation, were observed.
- DNA laddering and positive labeling for DNA strand breaks confirmed apoptosis induction.
Conclusions:
- Staphylococcus aureus actively invades osteoblasts.
- The bacteria induce apoptosis in osteoblasts through distinct cellular pathways.
- Osteoblast apoptosis is a significant mechanism contributing to Staphylococcus aureus-induced osteomyelitis.