An adenoviral vector-based mucosal vaccine is effective in protection against botulism.

Abstract:

:A replication-incompetent adenoviral vector encoding the heavy chain C-fragment (H(C)50) of botulinum neurotoxin type C (BoNT/C) was evaluated as a mucosal vaccine against botulism in a mouse model. Single intranasal inoculation of the adenoviral vector elicited a high level of H(C)50-specific IgG, IgG1 and IgG2a in sera and IgA in mucosal secretions as early as 2 weeks after vaccination. The antigen-specific serum antibodies were maintained at a high level at least until the 27th week. Immune sera showed high potency in neutralizing BoNT/C as indicated by in vitro toxin neutralization assay. The mice receiving single dose of 2 x 10(7) p.f.u. (plaque-forming unit) of adenoviral vector were completely protected against challenge with up to 10(4) x MLD(50) of BoNT/C. The protective immunity showed vaccine dose dependence from 10(5) to 2 x 10(7) p.f.u. of adenoviral vector. In addition, animals receiving single intranasal dose of 2 x 10(7) p.f.u. adenoviral vector could be protected against 100 x MLD(50) 27 weeks after vaccination. Animals with preexisting immunity to adenovirus could also be vaccinated intranasally and protected against lethal challenge with BoNT/C. These results suggest that the adenoviral vector is a highly effective gene-based mucosal vaccine against botulism.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Xu Q,Pichichero ME,Simpson LL,Elias M,Smith LA,Zeng M

doi

10.1038/gt.2008.181

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

367-75

issue

3

eissn

0969-7128

issn

1476-5462

pii

gt2008181

journal_volume

16

pub_type

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