Abstract:
: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.
journal_name
Infect Immunjournal_title
Infection and immunityauthors
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,Sordoi
10.1128/IAI.01341-12subject
Has Abstractpub_date
2013-08-01 00:00:00pages
2851-60issue
8eissn
0019-9567issn
1098-5522pii
IAI.01341-12journal_volume
81pub_type
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