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Intracellular Bacterial Biofilm-Like Pods in Urinary Tract Infections
Gregory G. Anderson,1*Joseph J. Palermo,1*Joel D. Schilling,1Robyn Roth,2John Heuser,2Scott J. Hultgren1
Escherichia coli entry into the bladder is met with potent innatedefenses, including neutrophil influx and epithelial exfoliation.Bacterial subversion of innate responses involves invasion intobladder superficial cells. We discovered that the intracellularbacteria matured into biofilms, creating pod-like bulges onthe bladder surface. Pods contained bacteria encased in a polysaccharide-richmatrix surrounded by a protective shell of uroplakin. Withinthe biofilm, bacterial structures interacted extensively withthe surrounding matrix, and biofilm associated factors had regionalvariation in expression. The discovery of intracellular biofilm-likepods explains how bladder infections can persist in the faceof robust host defenses.
1 Department of Molecular Microbiology, 2 Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: hultgren{at}borcim.wustl.edu
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