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Infection and Immunity, January 2002, p. 286-291, Vol. 70, No. 1
0019-9567/01/$04.00+0     DOI: 10.1128/IAI.70.1.286-291.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Dependence of Mycobacterium bovis BCG on Anaerobic Nitrate Reductase for Persistence Is Tissue Specific

Christian Fritz,1 Silvia Maass,1 Andreas Kreft,2 and Franz-Christoph Bange1*

Department of Medical Microbiology,1 Department of Pathology, Medical School Hannover, 30625 Hannover, Germany2

Received 21 May 2001/ Returned for modification 16 July 2001/ Accepted 28 September 2001

Mycobacterium bovis BCG, the only presently available vaccine against tuberculosis, was obtained from virulent M. bovis after serial passages in vitro. The vaccine strain retained at least some of its original virulence, as it persists in immune-competent hosts and occasionally may cause fatal disease in immune-deficient hosts. Mycobacterial persistence in vivo is thought to depend on anaerobic metabolism, an apparent paradox since all mycobacteria are obligate aerobes. Here we report that M. bovis BCG lacking anaerobic nitrate reductase (NarGHJI), an enzyme essential for nitrate respiration, failed to persist in the lungs, liver, and kidneys of immune-competent (BALB/c) mice. In immune-deficient (SCID) mice, however, bacilli caused chronic infection despite disruption of narG, even if growth of the mutant was severely impaired in lungs, liver, and kidneys. Persistence and growth of BCG in the spleens of either mouse strain appeared largely unaffected by lack of anaerobic nitrate reductase, indicating that the role of the enzyme in pathogenesis is tissue specific. These data suggest first that anaerobic nitrate reduction is essential for metabolism of M. bovis BCG in immune-competent but not immune-deficient mice and second that its role in mycobacterial disease is tissue specific, both of which are observations with important implications for pathogenesis of mycobacteria and vaccine development.

* Corresponding author. Mailing address: Institute für Medizinische Mikrobiologie, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany. Phone: 49-511-532-4352. Fax: 49-511-532-4366. E-mail: bange{at}mikrobio.mh-hannover.de.

Editor: S. H. E. Kaufmann

Infection and Immunity, January 2002, p. 286-291, Vol. 70, No. 1
0019-9567/01/$04.00+0     DOI: 10.1128/IAI.70.1.286-291.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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