Open AccessStaphylococcus saprophyticus ATCC 15305 is internalized into human urinary bladder carcinoma cell line 5637
Author(s) -
Szabados Florian,
Kleine Britta,
Anders Agnes,
Kaase Martin,
Sakınç Türkân,
Schmitz Inge,
Gatermann Sören
Publication year - 2008
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2008.01218.x
Subject(s) - staphylococcus saprophyticus , internalization , microbiology and biotechnology , staphylococcus aureus , biology , gentamicin protection assay , bacteria , staphylococcus , cell , cancer , metastasis , biochemistry , genetics
Invasion of bacteria into nonphagocytic host cells is an important pathogenicity factor for escaping the host defence system. Gram‐positive organisms, for example Staphylococcus aureus and Listeria monocytogenes , are invasive in nonphagocytic cells, and this mechanism is discussed as an important part of the infection process. Uropathogenic Escherichia coli and Staphylococcus saprophyticus can cause acute and recurrent urinary tract infections as well as bloodstream infections. Staphylococcus saprophyticus shows strong adhesion to human urinary bladder carcinoma and Hep2 cells and expresses the ‘Microbial Surface Components Recognizing Adhesive Matrix molecule’ (MSCRAMM)‐protein SdrI with collagen‐binding activity. MSCRAMMs are responsible for adhesion and collagen binding in S. aureus and are discussed as an important pathogenicity factor for invasion. To investigate internalization in S. aureus , several fluorescence activated cell sorting (FACS) assays have been described recently. We used a previously described FACS assay, with slight modifications, in addition to an antibiotic protection assay and transmission electron microscopy to show that S. saprophyticus ATCC 15305 and the wild‐type strain 7108 were internalized into the human urinary bladder carcinoma cell line 5637. The discovery of the internalization of S. saprophyticus may be an important step for understanding the pathogenicity of recurrent infections caused by this organism.