Journal
JOURNAL OF EXPERIMENTAL MEDICINE
Volume 200, Issue 5, Pages 647-657Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20040646
Keywords
microarrays; gene expression; antibiotics; latency; persistence
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Funding
- NIAID NIH HHS [AI 43846, R01 AI051668, R01 AI043846, AI 51668, AI 37856, T32 AI 07608, R01 AI037856, T32 AI007608, AI 36973, R01 AI036973] Funding Source: Medline
- PHS HHS [N01 30036] Funding Source: Medline
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Mycobacterium tuberculosis residing within pulmonary granulomas and cavities represents an important reservoir of persistent organisms during human latent tuberculosis infection. We present a novel in vivo model of tuberculosis involving the encapsulation of bacilli in semidiffusible hollow fibers that are implanted subcutaneously into mice. Granulomatous lesions develop around these hollow fibers, and in this microenvironment, the organisms demonstrate an altered physiologic state characterized by stationary-state colony-forming unit counts and decreased metabolic activity. Moreover, these organisms show an antimicrobial susceptibility pattern similar to persistent bacilli in current models of tuberculosis chemotherapy in that they are more susceptible to the sterilizing drug, rifampin, than to the bactericidal drug isoniazid. We used this model of extracellular persistence within host granulomas to study both gene expression patterns and mutant survival patterns. Our results demonstrate induction of dosR (Rv3133c) and 20 other members of the DosR regulon believed to mediate the transition into dormancy, and that rel(Mtb) is required for Mycobacterium tuberculosis survival during extracellular persistence within host granulomas. Interestingly, the dormancy phenotype of extracellular M. tuberculosis within host granulomas appears to be immune mediated and interferon-gamma dependent.
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