Bacterial penetration of bladder epithelium through lipid rafts.

Journal Article (Journal Article)

Type 1 fimbriated Escherichia coli represents the most common human uropathogen, owing much of its virulence to invasion of the uroepithelium, which is highly impermeable due to the preponderance of uroplakins and highly ordered lipid components. We sought to elucidate the molecular basis for E. coli invasion of the bladder epithelium by employing human 5637 bladder epithelial cells, and we found the following: (i) intracellular E. coli associated with caveolae and lipid raft components; (ii) RNA(i) reduction of caveolin-1 expression inhibited bacterial invasion; (iii) a signaling molecule required for E. coli invasion was located in lipid rafts and physically associated with caveolin-1; (iv) bacterial invasion was inhibited by lipid raft disrupting/usurping agents. In the mouse bladder, the E. coli type 1 fimbrial receptor, uroplakin Ia, was located in lipid rafts, and lipid raft disruptors inhibited E. coli invasion. Cumulatively, E. coli uroepithelial invasion occurs through lipid rafts, which, paradoxically, contribute to bladder impermeability.

Full Text

Duke Authors

Cited Authors

  • Duncan, MJ; Li, G; Shin, J-S; Carson, JL; Abraham, SN

Published Date

  • April 30, 2004

Published In

Volume / Issue

  • 279 / 18

Start / End Page

  • 18944 - 18951

PubMed ID

  • 14976212

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M400769200


  • eng

Conference Location

  • United States