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Nat Med. 2007 May;13(5):625-30. Epub 2007 Apr 8.

Cyclic AMP-regulated exocytosis of Escherichia coli from infected bladder epithelial cells.

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Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA.


The superficial bladder epithelium is a powerful barrier to urine and also serves as a regulator of bladder volume, which is achieved by apical exocytosis of specialized fusiform vesicles during distension of the bladder. We report that type 1 fimbriated uropathogenic Escherichia coli (UPEC) circumvents the bladder barrier by harboring in these Rab27b/CD63-positive and cAMP-regulatable fusiform vesicles within bladder epithelial cells (BECs). Incorporation of UPEC into BEC fusiform compartments enabled bacteria to escape elimination during voiding and to re-emerge in the urine as the bladder distended. Notably, treatment of UPEC-infected mice with a drug that increases intracellular cAMP and induces exocytosis of fusiform vesicles reduced the number of intracellular E. coli.

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[Indexed for MEDLINE]

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