A shear stress micromodel of urinary tract infection by the Escherichia coli producing Dr adhesin

Autoři: Beata Zalewska-Piątek aff001;  Marcin Olszewski aff001;  Tomasz Lipniacki aff002;  Sławomir Błoński aff002;  Miłosz Wieczór aff003;  Piotr Bruździak aff003;  Anna Skwarska aff004;  Bogdan Nowicki aff005;  Stella Nowicki aff005;  Rafał Piątek aff001
Působiště autorů: Department of Molecular Microbiology and Biotechnology, Gdańsk University of Technology, Gdańsk, Poland aff001;  Department of Biosystems and Soft Matter, Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland aff002;  Department of Physical Chemistry, Gdańsk University of Technology, Gdańsk, Poland aff003;  Department of Oncology, University of Oxford, Oxford, United Kingdom aff004;  Nowicki Institute for Woman’s Health Research, Brentwood, Tennessee, United States of America aff005
Vyšlo v časopise: A shear stress micromodel of urinary tract infection by the Escherichia coli producing Dr adhesin. PLoS Pathog 16(1): e32767. doi:10.1371/journal.ppat.1008247
Kategorie: Research Article
doi: 10.1371/journal.ppat.1008247


In this study, we established a dynamic micromodel of urinary tract infection to analyze the impact of UT-segment-specific urinary outflow on the persistence of E. coli colonization. We found that the adherence of Dr+ E. coli to bladder T24 transitional cells and type IV collagen is maximal at lowest shear stress and is reduced by any increase in flow velocity. The analyzed adherence was effective in the whole spectrum of physiological shear stress and was almost irreversible over the entire range of generated shear force. Once Dr+ E. coli bound to host cells or collagen, they did not detach even in the presence of elevated shear stress or of chloramphenicol, a competitive inhibitor of binding. Investigating the role of epithelial surface architecture, we showed that the presence of budding cells–a model microarchitectural obstacle–promotes colonization of the urinary tract by E. coli. We report a previously undescribed phenomenon of epithelial cell “rolling-shedding” colonization, in which the detached epithelial cells reattach to the underlying cell line through a layer of adherent Dr+ E. coli. This rolling-shedding colonization progressed continuously due to “refilling” induced by the flow-perturbing obstacle. The shear stress of fluid containing free-floating bacteria fueled the rolling, while providing an uninterrupted supply of new bacteria to be trapped by the rolling cell. The progressive rolling allows for transfer of briefly attached bacteria onto the underlying monolayer in a repeating cascading event.

Klíčová slova:

Adhesins – Bladder – Cell binding – Collagens – Host cells – Pili and fimbriae – Renal system – Shear stresses


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