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Recombinant probiotics for treatment and prevention of enterotoxigenic Escherichia coli diarrhea


Paton, AW and Jennings, MP and Morona, R and Wang, H and Forareta, A and Roddam, LF and Paton, JC, Recombinant probiotics for treatment and prevention of enterotoxigenic Escherichia coli diarrhea , Gastroenterology, 128, (5) pp. 1219-1228. ISSN 0016-5085 (2005) [Refereed Article]

DOI: doi:10.1053/j.gastro.2005.01.050


Background & Aims: We have developed a therapeutic strategy for gastrointestinal infections that is based on molecular mimicry of host receptors for bacterial toxins on the surface of harmless gut bacteria. The aim of this study was to apply this to the development of a recombinant probiotic for treatment and prevention of diarrheal disease caused by enterotoxigenic Escherichia coli strains that produce heat-labile enterotoxin. Methods: This was achieved by expressing glycosyltransferase genes from Neisseria meningitidis or Campylobacter jejuni in a harmless Escherichia coli strain (CWG308), resulting in the production of a chimeric lipopolysaccharide capable of binding heat-labile enterotoxin with high avidity. Results: The strongest heat-labile enterotoxin binding was achieved with a construct (CWG308:pLNT) that expresses a mimic of lacto-N-neotetraose, which neutralized <93.8% of the heat-labile enterotoxin activity in culture lysates of diverse enterotoxigenic Escherichia coli strains of both human and porcine origin. When tested with purified heat-labile enterotoxin, it was capable of adsorbing approximately 5% of its own weight of toxin. Weaker toxin neutralization was achieved with a construct that mimicked the ganglioside GM2. Preabsorption with, or coadministration of, CWG308:pLNT also resulted in significant in vivo protection from heat-labile enterotoxin-induced fluid secretion in rabbit ligated ileal loops. Conclusions: Toxin-binding probiotics such as those described here have considerable potential for prophylaxis and treatment of enterotoxigenic Escherichia coli-induced travelers' diarrhea. © 2005 by the American Gastroenterological Association.

Item Details

Item Type:Refereed Article
Research Division:Health Sciences
Research Group:Public health
Research Field:Preventative health care
Objective Division:Health
Objective Group:Other health
Objective Field:Other health not elsewhere classified
UTAS Author:Roddam, LF (Dr Louise Roddam)
ID Code:48867
Year Published:2005
Web of Science® Times Cited:73
Deposited By:Menzies Institute for Medical Research
Deposited On:2007-11-05
Last Modified:2011-10-06

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