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Infection and Immunity, August 2001, p. 5010-5015, Vol. 69, No. 8
Department of
Vaccinology1 and Department of
Bacteriology,3 National Institute of Public
Health, N-0403 Oslo, and Department of Microbiology,
Institute of Pharmacy, University of Oslo, N-0316
Oslo,2 Norway
Received 28 December 2000/Returned for modification 26 March
2001/Accepted 21 May 2001
We have studied the ability of outer membrane vesicle (OMV)
vaccines from Neisseria meningitidis serogroup B to
induce vaccine-specific antibody and spleen cell proliferative
responses in mice after being administered intranasally (i.n.) and/or
subcutaneously (s.c.). A series of four weekly i.n. doses (25 µg)
without adjuvant or a single s.c. dose (2.5 µg) with aluminum
hydroxide was followed 2 months later by secondary i.n. or s.c.
immunizations. After i.n. priming, both immunoglobulin G (IgG) antibody
responses in serum, measured by enzyme-linked immunosorbent assay, and
IgA antibodies in saliva and extracts of feces were significantly boosted by later i.n. immunizations. The IgG antibody responses in
serum were also significantly augmented by secondary s.c. immunization after i.n. as well as s.c. priming. Sera from mice immunized i.n. reached the same level of bactericidal activity as after s.c. immunizations. The s.c. immunizations alone, however, had no effect on
mucosal IgA antibody responses, but could prime for booster antibody
responses in secretions to later i.n. immunizations. The i.n.
immunizations also led to marked OMV-specific spleen cell proliferation
in vitro. Both serum antibody responses and spleen cell proliferation
were higher after i.n. priming and later s.c. immunizations than after
s.c. immunizations alone. There was thus no evidence that i.n. priming
had induced immunological tolerance within the B- or T-cell system. Our
results indicate that a nonproliferating meningococcal OMV vaccine
given i.n. can induce immunological memory and that it may be favorably
combined with similar vaccines for injections.
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.8.5010-5015.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Meningococcal Outer Membrane Vesicle Vaccine Given Intranasally
Can Induce Immunological Memory and Booster Responses without
Evidence of Tolerance
*
Corresponding author. Department of Vaccinology,
National Institute of Public Health, P.O. Box 4404 Torshov, N-0403
Oslo, Norway. Phone: 47 22 04 25 01. Fax: 47 22 04 23 01. E-mail:
bjorn.haneberg{at}folkehelsa.no.
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