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Infection and Immunity, August 2001, p. 4816-4822, Vol. 69, No. 8
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.8.4816-4822.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Protection of BALB/c Mice against Brucella abortus 544 Challenge by Vaccination with Bacterioferritin or P39 Recombinant Proteins with CpG Oligodeoxynucleotides as Adjuvant

Ayman Al-Mariri,1 Anne Tibor,1 Pascal Mertens,1 Xavier De Bolle,1 Patrick Michel,2 Jacques Godefroid,2 Karl Walravens,2 and Jean-Jacques Letesson1,*

Unité de Recherche en Biologie Moléculaire, Laboratoire d'Immunologie et de Microbiologie, Facultés Universitaires Notre-Dame de la Paix, B-5000 Namur,1 and Centre d'Etude et de Recherche Vétérinaire et Agrochimique, B-1180 Brussels,2 Belgium

Received 28 February 2001/Returned for modification 11 April 2001/Accepted 7 May 2001

The P39 and the bacterioferrin (BFR) antigens of Brucella melitensis 16M were previously identified as T dominant antigens able to induce both delayed-type hypersensivity in sensitized guinea pigs and in vitro gamma interferon (IFN-gamma ) production by peripheral blood mononuclear cells from infected cattle. Here, we analyzed the potential for these antigens to function as a subunitary vaccine against Brucella abortus infection in BALB/c mice, and we characterized the humoral and cellular immune responses induced. Mice were injected with each of the recombinant proteins alone or adjuvanted with either CpG oligodeoxynucleotides (CpG ODN) or non-CpG ODN. Mice immunized with the recombinant antigens with CpG ODN were the only group demonstrating both significant IFN-gamma production and T-cell proliferation in response to either Brucella extract or to the respective antigen. The same conclusion holds true for the antibody response, which was only demonstrated in mice immunized with recombinant antigens mixed with CpG ODN. The antibody titers (both immunoglobulin G1 [IgG1] and IgG2a) induced by P39 immunization were higher than the titers induced by BFR (only IgG2a). Using a B. abortus 544 challenge, the level of protection was analyzed and compared to the protection conferred by one immunization with the vaccine strain B19. Immunization with P39 and CpG ODN gave a level of protection comparable to the one conferred by B19 at 4 weeks postchallenge, and the mice were still significantly protected at 8 weeks postchallenge, although to a lesser extent than the B19-vaccinated group. Intriguingly, no protection was detected after BFR vaccination. All other groups did not demonstrate any protection.

* Corresponding author. Mailing address. Unité de Recherche en Biologie Moléculaire (URBM), Laboratoire d'Immunologie et de Microbiologie, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium. Phone: 32-81-72-44-02. Fax: 32-81-72-42-97. E-mail: jean-jacqnes.letesson{at}fundp.ac.be.

Infection and Immunity, August 2001, p. 4816-4822, Vol. 69, No. 8
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.8.4816-4822.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.