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Infection and Immunity, March 2001, p. 1547-1553, Vol. 69, No. 3
Département de Microbiologie des
Ecosystèmes, Institut Pasteur de Lille, 59019 Lille Cedex,
France,1 and Laboratoire du
Tétanos, Institut Pasteur de Bruxelles, B-1180 Brussels,
Belgium2
Received 2 October 2000/Returned for modification 2 November
2000/Accepted 6 December 2000
The use of live microorganisms as an antigen delivery system is an
effective means to elicit local immune responses and thus represents a
promising strategy for mucosal vaccination. In this respect, lactic
acid bacteria represent an original and attractive approach, as they
are safe organisms that are used as food starters and probiotics. To
determine whether an immune response could be elicited by intranasal
delivery of recombinant lactobacilli, a Lactobacillus
plantarum strain of human origin (NCIMB8826) was selected as the
expression host. Cytoplasmic production of the 47-kDa fragment C of
tetanus toxin (TTFC) was achieved at different levels depending on the
plasmid construct. All recombinant strains proved to be immunogenic by
the intranasal route in mice and able to elicit very high systemic
immunoglobulin G (IgG1, IgG2b, and IgG2a) responses which correlated to
the antigen dose. No significant differences in enzyme-linked
immunosorbent assay IgG titers were observed when mice were immunized
with live or mitomycin C-treated recombinant lactobacilli.
Nevertheless, protection against the lethal effect of tetanus toxin was
obtained only with the strains producing the highest dose of antigen
and was greater following immunization with live bacteria. Significant
TTFC-specific mucosal IgA responses were measured in bronchoalveolar
lavage fluids, and antigen-specific T-cell responses were detected in
cervical lymph nodes, both responses being higher in mice receiving a
double dose of bacteria (at a 24-h interval) at each administration. These results demonstrate that recombinant lactobacilli can induce specific humoral (protective) and mucosal antibodies and cellular immune response against protective antigens upon nasal administration.
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.3.1547-1553.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Mucosal Immune Responses and Protection against
Tetanus Toxin after Intranasal Immunization with Recombinant
Lactobacillus plantarum
*
Corresponding author. Mailing address:
Département de Microbiologie des Ecosystèmes, Institut
Pasteur de Lille, 1, rue du Pr Calmette, B.P. 245, F-59019 Lille Cedex,
France. Phone: (33) 320-87-77-74. Fax: (33) 320-87-79-08. E-mail:
corinne.grangette{at}pasteur-lille.fr.
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