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Updated: May 11, 2026

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
Published on: January 17, 2025
Staphylococcus aureus-induced G2/M phase transition delay in host epithelial cells increases bacterial infective
Ludmila Alekseeva1, Lucie Rault, Sintia Almeida
1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow, Russian Federation.
Staphylococcus aureus infection slows host cell proliferation and enlarges cells. Live bacteria induce a G2/M phase delay, impacting cell cycle progression for bacterial propagation.
Area of Science:
- Microbiology
- Cell Biology
- Pathogen-Host Interactions
Background:
- Staphylococcus aureus is a versatile opportunistic pathogen causing various infections.
- Epithelial surfaces are primary sites for S. aureus colonization and infection.
Purpose of the Study:
- Investigate the cytopathic effects of S. aureus on host cell cycle progression.
- Determine the impact of S. aureus strains from human and animal origins on epithelial cell lines.
Main Methods:
- Utilized human HeLa and bovine MAC-T epithelial cell lines.
- Employed flow cytometry to analyze cell cycle phases.
- Conducted Western blot experiments to examine protein expression related to mitosis.
Main Results:
- S. aureus invasion reduced cell proliferation and induced host cell enlargement.
- A significant decrease in mitotic cells and a delay in G2/M phase transition were observed.
- The G2/M delay was dependent on live S. aureus and linked to inactive Cdk1 and unphosphorylated histone H3.
Conclusions:
- S. aureus actively subverts host cell cycle progression, specifically inducing a G2/M phase delay.
- This delay may enhance bacterial propagation within the host, highlighting a novel mechanism of pathogenesis.
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