Secretory IgA and mucin-mediated biofilm formation by environmental strains of Escherichia coli: role of type 1 pili.

Journal Article (Journal Article)

Recent studies suggest the importance of secretory IgA (SIgA) and mucin in the mediation of biofilm formation by commensal bacteria within the mammalian gut. Studies using a variety of strains of Escherichia coli have indicated that the interaction between E. coli and SIgA is dependent on the type 1 pilus. In this study, the importance of the pilus in SIgA-mediated biofilm formation by a laboratory strain (MG1655) and environmental (fecal) strains of E. coli was evaluated. Transient expression of the type 1 pilus by the laboratory strain of E. coli failed to facilitate SIgA-mediated biofilm formation, whereas constitutive expression of the type 1 pilus by the laboratory strain was sufficient. In contrast, transient expression of the type 1 pilus was sufficient to facilitate SIgA-mediated biofilm formation by environmental isolates. The "threshold" for mucin-mediated biofilm formation appeared to be lower than that for SIgA-mediated biofilm formation, perhaps reflecting disparate roles of mucin and SIgA in mediating biofilm formation in the gut. These studies also provide the first procedures for the growth of bacterial biofilms on live epithelial cells in vitro, an important development that may facilitate future studies on the effects of bacterial biofilms on epithelial cells.

Full Text

Duke Authors

Cited Authors

  • Bollinger, RR; Everett, ML; Wahl, SD; Lee, Y-H; Orndorff, PE; Parker, W

Published Date

  • February 2006

Published In

Volume / Issue

  • 43 / 4

Start / End Page

  • 378 - 387

PubMed ID

  • 16310051

International Standard Serial Number (ISSN)

  • 0161-5890

Digital Object Identifier (DOI)

  • 10.1016/j.molimm.2005.02.013


  • eng

Conference Location

  • England