Protective efficacy induced by recombinant Clostridium difficile toxin fragments

Leuzzi, R. et al. (2013) Protective efficacy induced by recombinant Clostridium difficile toxin fragments. Infection and Immunity, 81(8), pp. 2851-2860. (doi: 10.1128/IAI.01341-12)

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Clostridium difficile is a spore-forming bacterium that can reside in animals and humans. C. difficile infection causes a variety of clinical symptoms, ranging from diarrhea to fulminant colitis. Disease is mediated by TcdA and TcdB, two large enterotoxins released by C. difficile during colonization of the gut. In this study, we evaluated the ability of recombinant toxin fragments to induce neutralizing antibodies in mice. The protective efficacies of the most promising candidates were then evaluated in a hamster model of disease. While limited protection was observed with some combinations, coadministration of a cell binding domain fragment of TcdA (TcdA-B1) and the glucosyltransferase moiety of TcdB (TcdB-GT) induced systemic IgGs which neutralized both toxins and protected vaccinated animals from death following challenge with two strains of C. difficile. Further characterization revealed that despite high concentrations of toxin in the gut lumens of vaccinated animals during the acute phase of the disease, pathological damage was minimized. Assessment of gut contents revealed the presence of TcdA and TcdB antibodies, suggesting that systemic vaccination with this pair of recombinant polypeptides can limit the disease caused by toxin production during C. difficile infection.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Douce, Dr Gillian and Candlish, Mrs Denise and Spencer, Dr Janice and Buckley, Dr Anthony and Irvine, Ms June
Authors: Leuzzi, R., Spencer, J., Buckley, A., Brettoni, C., Martinelli, M., Tulli, L., Marchi, S., Luzzi, E., Irvine, J., Candlish, D., Veggi, D., Pansegrau, W., Fiaschi, L., Savino, S., Swennen, E., Cakici, O., Oviedo-Orta, E., Giraldi, M., Baudner, B., D'Urzo, N., Maione, D., Soriani, M., Rappuoli, R., Pizza, M., Douce, G. R., and Scarselli, M.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:Infection and Immunity
Publisher:American Society for Microbiology
ISSN (Online):1098-5522
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
492111Genetic and phenotypic characterisation of emerging virulent Clostridium difficileGillian DouceWellcome Trust (WELLCOME)086418/B/08/ZIII - BACTERIOLOGY