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Infection and Immunity, November 2004, p. 6622-6632, Vol. 72, No. 11
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.11.6622-6632.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The Protective Effect of the Mycobacterium bovis BCG Vaccine Is Increased by Coadministration with the Mycobacterium tuberculosis 72-Kilodalton Fusion Polyprotein Mtb72F in M. tuberculosis-Infected Guinea Pigs

Lise Brandt,1 Yasir A. W. Skeiky,2 Mark R. Alderson,2 Yves Lobet,3 Wilfried Dalemans,3 Oliver C. Turner,1 Randall J. Basaraba,1 Angelo A. Izzo,1 Todd M. Lasco,1 Philip L. Chapman,4 Steven G. Reed,2 and Ian M. Orme1*

Department of Microbiology, Immunology, and Pathology,1 Department of Statistics, Colorado State University, Fort Collins, Colorado,4 Corixa Corportation, Seattle, Washington,2 GlaxoSmithKline Biologicals, Rixensart, Belgium3

Received 5 March 2004/ Returned for modification 12 May 2004/ Accepted 30 July 2004

A tuberculosis vaccine candidate consisting of a 72-kDa polyprotein or fusion protein based upon the Mtb32 and Mtb39 antigens of Mycobacterium tuberculosis and designated Mtb72F was tested for its protective capacity as a potential adjunct to the Mycobacterium bovis BCG vaccine in the mouse and guinea pig models of this disease. Formulation of recombinant Mtb72F (rMtb72F) in an AS02A adjuvant enhanced the Th1 response to BCG in mice but did not further reduce the bacterial load in the lungs after aerosol challenge infection. In the more stringent guinea pig disease model, rMtb72F delivered by coadministration with BCG vaccination significantly improved the survival of these animals compared to BCG alone, with some animals still alive and healthy in their appearance at >100 weeks post-aerosol challenge. A similar trend was observed with guinea pigs in which BCG vaccination was boosted by DNA vaccination, although this increase was not statistically significant due to excellent protection conferred by BCG alone. Histological examination of the lungs of test animals indicated that while BCG controls eventually died from overwhelming lung consolidation, the majority of guinea pigs receiving BCG mixed with rMtb72F or boosted twice with Mtb72F DNA had mostly clear lungs with minimal granulomatous lesions. Lesions were still prominent in guinea pigs receiving BCG and the Mtb72F DNA boost, but there was considerable evidence of lesion healing and airway remodeling and reestablishment. These data support the hypothesis that the coadministration or boosting of BCG vaccination with Mtb72F may limit the lung consolidation seen with BCG alone and may promote lesion resolution and healing. Collectively, these data suggest that enhancing BCG is a valid vaccination strategy for tuberculosis that is worthy of clinical evaluation.

* Corresponding author. Mailing address: Dept. of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523. Phone: (970) 491-5777. Fax: (970) 491-5125. E-mail: iorme{at}lamar.colostate.edu.

Editor: S. H. E. Kaufmann

Infection and Immunity, November 2004, p. 6622-6632, Vol. 72, No. 11
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.11.6622-6632.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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