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Virulence and immune response induced by Mycobacterium avium complex strains in a model of progressive pulmonary tuberculosis and subcutaneous infection in BALB/c mice.
- Source :
-
Infection and immunity [Infect Immun] 2013 Nov; Vol. 81 (11), pp. 4001-12. Date of Electronic Publication: 2013 Aug 19. - Publication Year :
- 2013
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Abstract
- The genus Mycobacterium comprises more than 150 species, including important pathogens for humans which cause major public health problems. The vast majority of efforts to understand the genus have been addressed in studies with Mycobacterium tuberculosis. The biological differentiation between M. tuberculosis and nontuberculous mycobacteria (NTM) is important because there are distinctions in the sources of infection, treatments, and the course of disease. Likewise, the importance of studying NTM is not only due to its clinical significance but also due to the mechanisms by which some species are pathogenic while others are not. Mycobacterium avium complex (MAC) is the most important group of NTM opportunistic pathogens, since it is the second largest medical complex in the genus after the M. tuberculosis complex. Here, we evaluated the virulence and immune response of M. avium subsp. avium and Mycobacterium colombiense, using experimental models of progressive pulmonary tuberculosis and subcutaneous infection in BALB/c mice. Mice infected intratracheally with a high dose of MAC strains showed high expression of tumor necrosis factor alpha (TNF-α) and inducible nitric oxide synthase with rapid bacillus elimination and numerous granulomas, but without lung consolidation during late infection in coexistence with high expression of anti-inflammatory cytokines. In contrast, subcutaneous infection showed high production of the proinflammatory cytokines TNF-α and gamma interferon with relatively low production of anti-inflammatory cytokines such as interleukin-10 (IL-10) or IL-4, which efficiently eliminate the bacilli but maintain extensive inflammation and fibrosis. Thus, MAC infection evokes different immune and inflammatory responses depending on the MAC species and affected tissue.
- Subjects :
- Animals
Cytokines metabolism
Disease Models, Animal
Humans
Lung pathology
Male
Mice
Mice, Inbred BALB C
Mycobacterium Infections microbiology
Nitric Oxide Synthase Type II biosynthesis
Skin pathology
Tuberculosis, Cutaneous microbiology
Tuberculosis, Pulmonary microbiology
Mycobacterium Infections immunology
Mycobacterium avium Complex immunology
Mycobacterium avium Complex pathogenicity
Tuberculosis, Cutaneous immunology
Tuberculosis, Pulmonary immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1098-5522
- Volume :
- 81
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Infection and immunity
- Publication Type :
- Academic Journal
- Accession number :
- 23959717
- Full Text :
- https://doi.org/10.1128/IAI.00150-13