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- W3197485279 abstract "Staphylococcus aureus expresses virulence factors to trigger its internalization into eukaryote cells and to survive inside different subcellular compartments. This paper describes an enzyme protection assay to study the extent of S. aureus internalization and its intracellular survival in adherent non-professional phagocytic cells (NPPCs) as well as the intracellular efficacy of antimicrobial compounds. NPPCs are grown in a multi-well plate until they reach 100% confluence. S. aureus cultures are grown overnight in cell culture medium. The bacterial suspension is diluted according to the number of cells per well to inoculate the cells at a controlled multiplicity of infection. Inoculated cells are incubated for 2 h to allow the bacteria to be internalized by the NPPCs, following which lysostaphin is added to the culture medium to selectively kill extracellular bacteria. Lysostaphin is present in the culture medium for the rest of the experiment. At this point, the infected cells could be incubated with antimicrobial compounds to assess their intracellular activities against S. aureus. Next, the cells are washed three times to remove the drugs, and intracellular S. aureus load is then quantified by culturing on agar plates. Alternatively, for studying staphylococcal virulence factors involved in intracellular survival and cell toxicity, lysostaphin could be inactivated with proteinase K to eliminate the need for washing steps. This tip improves the reliability of the intracellular bacterial load quantification, especially if cells tend to detach from the culture plate when they become heavily infected because of the multiplication of intracellular S. aureus. These protocols can be used with virtually all types of adherent NPPCs and with 3D cell culture models such as organoids." @default.
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- W3197485279 date "2021-09-08" @default.
- W3197485279 modified "2023-10-18" @default.
- W3197485279 title "Improved Enzyme Protection Assay to Study <em>Staphylococcus aureus</em> Internalization and Intracellular Efficacy of Antimicrobial Compounds" @default.
- W3197485279 doi "https://doi.org/10.3791/62903" @default.
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