Mucosal immunization with recombinant heparin-binding haemagglutinin adhesin suppresses extrapulmonary dissemination of Mycobacterium bovis bacillus Calmette-Guérin (BCG) in infected mice

Vaccine
Hideyasu KohamaTakeshi Arakawa

Abstract

It is generally accepted that cellular immunity plays a critical role in the protection against Mycobacterium tuberculosis, an intracellular pathogen. Recently, however, an increasing number of reports indicate the important contribution of humoral immunity against mycobacterial infection. Since M. tuberculosis establishes its primary lesion in the lung, induction of humoral immunity in the airway tract by mucosal immunization regime could provide protective immunity against tuberculosis. In this study, mycobacterial heparin-binding haemagglutinin adhesin (HBHA) was used as an immunization antigen because HBHA is an essential virulence factor required for the infection of lung epithelial cells and extrapulmonary dissemination of mycobacteria. The effects of intranasal immunization with a yeast-expressed recombinant (r) HBHA co-administered with a mucosal adjuvant cholera toxin (CT) on the induction of humoral and cellular immunity were examined, and its protective efficacy against pulmonary challenge infection with Mycobacterium bovis bacillus Calmette-Guérin (BCG) was evaluated. HBHA-specific antibodies were induced in serum and airway tract of immunized mice, which specifically recognized native HBHA expressed on M. bovis BCG...Continue Reading

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