Nanoscale surface modification favors benign biofilm formation and impedes adherence by pathogens - Abstract

We have found in vitro that a biofilm of benign Escherichia coli 83972 interferes with urinary catheter colonization by pathogens, and in human studies E. coli 83972-coated urinary catheters are associated with lower rates of catheter-associated urinary tract infections. We hypothesized that modifying surfaces to present mannose ligands for the type 1 fimbriae of E. coli would promote formation of dense E. coli 83972 biofilms, thereby interfering with surface colonization by Enterococcus faecalis, a common uropathogen. We covalently immobilized mannose on silicon substrates by attaching amino-terminated mannose derivative to carboxylic acid-terminated monolayers via amidation. Fluorescence microscopy showed that E. coli 83972 adherence to mannose-modified surfaces increased 4.4-fold compared to unmodified silicon surfaces. Pre-exposing mannose-modified surfaces to E. coli 83972 established a protective biofilm that reduced E. faecalis adherence by 83-fold. Mannose-fimbrial interactions were essential for the improved E. coli 83927 adherence and interference effects. From the Clinical Editor: Recurrent urinary tract infections remain major adverse events associated with catheter use. The authors report that modifying catheter surface to present mannose ligands for the type 1 fimbriae of benign Escherichia coli 83972 promotes formation of dense E. coli biofilms, which 100-fold reduces urinary catheter colonization of uropathogens. Future application of this technology is expected to result in substantial UTI risk reduction in catheter users.

Written by:
Trautner BW, Lopez AI, Kumar A, Siddiq DM, Liao KS, Li Y, Tweardy DJ, Cai C. Are you the author?
Houston VA Health Services Research and Development Center of Excellence, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA. This email address is being protected from spambots. You need JavaScript enabled to view it.

Reference:Nanomedicine. 2012 Apr;8(3):261-70
doi:10.1016/j.nano.2011.11.014

PubMed Abstract
PMID: 22197726

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