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- W2955690304 abstract "Shigella flexneri is an intracellular bacterial pathogen that gains access to the gut epithelium using a specialized Type III Secretion System (T3SS). Various determinants mediating this invasive infection have been experimentally verified using the classical gentamicin protection assay presented here. In this assay epithelial cell lines are infected by bacteria in vitro and the extracellular bacteria are killed by gentamicin. The internalized bacteria, which are protected from the bactericidal action of gentamicin, are recovered by lysing the epithelial cells and enumerated by determining the colonies formed on solid medium. Various techniques based on light microscopy, such as immunofluorescence and bacteria expressing fluorescent proteins, are also used for studying intracellular bacteria. However, these techniques are not only labor intensive and require sophisticated equipment, but mostly are also not quantitative. Despite being an easy quantitative method to study invasiveness of bacteria, the gentamicin protection assay cannot distinguish between the survival and multiplication of the internalized bacteria over longer incubation periods. To alleviate the complications created by multiplication and dissemination of internalized bacteria, complementary assays like plaque formation assays are required. This protocol presents an easy and cost-effective method to determine the invasiveness and the capacity to establish an infection of Shigella under different conditions." @default.
- W2955690304 created "2019-07-12" @default.
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- W2955690304 date "2019-01-01" @default.
- W2955690304 modified "2023-10-14" @default.
- W2955690304 title "Gentamicin Protection Assay to Determine the Number of Intracellular Bacteria during Infection of Human TC7 Intestinal Epithelial Cells by Shigella flexneri" @default.
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- W2955690304 doi "https://doi.org/10.21769/bioprotoc.3292" @default.
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