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Infection and Immunity, July 2004, p. 4052-4060, Vol. 72, No. 7
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.7.4052-4060.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Mucosal Vaccination against Serogroup B Meningococci: Induction of Bactericidal Antibodies and Cellular Immunity following Intranasal Immunization with NadA of Neisseria meningitidis and Mutants of Escherichia coli Heat-Labile Enterotoxin

Frances Bowe,1,{dagger} Ed C. Lavelle,2,{dagger} Edel A. McNeela,2,{dagger} Christine Hale,1 Simon Clare,1 Beatrice Arico,3 Marzia M. Giuliani,3 Aaron Rae,1 Alan Huett,1 Rino Rappuoli,3 Gordon Dougan,1 and Kingston H. G. Mills2*

Centre for Molecular Microbiology and Infection, Department of Biological Sciences, Imperial College of Science, Technology and Medicine, London, United Kingdom,1 Immune Regulation Research Group, Department of Biochemistry, Trinity College, Dublin, Ireland,2 Immunological Research Institute Siena, Chiron S.p.A, 53100 Siena, Italy3

Received 22 December 2003/ Returned for modification 17 February 2004/ Accepted 25 March 2004

Conjugated polysaccharide vaccines protect against serogroup C meningococci. However, this approach cannot be applied to serogroup B, which is still a major cause of meningitis. We evaluated the immunogenicity of three surface-exposed proteins from serogroup B Neisseria meningitidis (App, NhhA, and NadA) identified during whole-genome sequencing. Mice were immunized intranasally with individual proteins in the presence of wild-type Escherichia coli heat-labile enterotoxin (LTwt), LTR72, a partially inactivated mutant, or LTK63, a completely nontoxic mutant, as the adjuvant. Each of the meningococcal proteins induced significant cellular responses; NhhA and NadA induced strong antibody responses, but only NadA induced bactericidal antibody when administered intranasally with mucosal adjuvants. In addition, immunoglobulin A and bactericidal antibodies were detected in the respiratory tract following intranasal delivery of NadA. Analysis of antigen-specific cytokine production by T cells from immunized mice revealed that intranasal immunization with NadA alone failed to generate detectable cellular immune responses. In contrast, LTK63, LTR72, and LTwt significantly augmented NadA-specific gamma interferon, interleukin-4 (IL-4), IL-5, and IL-10 production by spleen and lymph node cells, suggesting that both Th1 and Th2 cells were induced in vivo. The strongest cellular responses and highest bactericidal antibody titers were generated with LTR72 as the adjuvant. These findings demonstrate that the quality and magnitude of the immune responses generated by mucosal vaccines are influenced by the antigen as well as the adjuvant and suggest that nasal delivery of NadA with mucosal adjuvants has considerable potential in the development of a mucosal vaccine against serogroup B meningococci.

* Corresponding author. Mailing address: Immune Regulation Research Group, Department of Biochemistry, Trinity College, Dublin 2, Ireland. Phone: 353-1-6083573. Fax: 353-1-6772086. E-mail: kingston.mills{at}tcd.ie.

Editor: S. H. E. Kaufmann

{dagger} F.B., E.C.L., and E.A.M. contributed equally to this work.

Infection and Immunity, July 2004, p. 4052-4060, Vol. 72, No. 7
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.7.4052-4060.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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