期刊
EMBO JOURNAL
卷 19, 期 12, 页码 2803-2812出版社
OXFORD UNIV PRESS
DOI: 10.1093/emboj/19.12.2803
关键词
adhesin; bladder; invasion; type 1 pill; urinary tract infection
资金
- NIAID NIH HHS [AI09787, F32 AI009787, 5R37AI2954910] Funding Source: Medline
- NIDDK NIH HHS [R01DK51406, R01 DK051406] Funding Source: Medline
Most strains of uropathogenic Escherichia coli (UPEC) encode filamentous adhesive organelles called type 1 pili. We have determined that the type 1 pilus adhesin, FimH, mediates not only bacterial adherence, but also invasion of human bladder epithelial cells. In contrast, adherence mediated by another pilus adhesin, PapG, did not initiate bacterial internalization. FimH-mediated invasion required localized host actin reorganization, phosphoinositide 3-kinase (PI 3-kinase) activation and host protein tyrosine phosphorylation, but not activation of Src-family tyrosine kinases, Phosphorylation of focal adhesin kinase (FAK) at Tyr397 and the formation of complexes between FAK and PI 3-kinase and between a-actinin and vinculin were found to correlate with type 1 pilus-mediated bacterial invasion. Inhibitors that prevented bacterial invasion also blocked the formation of these complexes. Our results demonstrate that UPEC strains are not strictly extracellular pathogens and that the type 1 pilus adhesin FimH can directly trigger host cell signaling cascades that lead to bacterial internalization.
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