title: Interferon regulatory factor 1 in mycobacterial infection.
abstract: In order to understand the role of IRF-1 in the development of murine tuberculosis in vivo, IRF-1 knockout mice were infected with Mycobacterium tuberculosis by placing them in the exposure chamber of an airborne infection apparatus. These knockout mice developed multifocal necrotic lesions in the lung, liver and spleen tissues and died of disseminated tuberculosis within 43 days of infection. Compared with the levels in wild-type mice, the pulmonary inducible NO synthase (iNOS) mRNA expression level was significantly lower, but IL-18 and IL-6 mRNA levels were higher. There was no statistically significant difference in the expression of IFN-gamma and TNF-alpha mRNA between the IRF-1 knockout and wild-type mice. IRF-1 is indirectly responsible for iNOS mRNA expression and plays an important role in the pathogenesis of murine tuberculosis.
authors.affiliation: Department of Molecular Pathology, The Research Institute of Tuberculosis, Kiyose, Tokyo 204-0022, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamada
authors.forename: Satoru
authors.initials: S
authors.lastname: Mizuno
authors.forename: Isamu
authors.initials: I
authors.lastname: Sugawara
mesh_terms: D000818:Animals; D016207:Cytokines / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D050856:Interferon Regulatory Factor-1; D008168:Lung / Q000382:microbiology / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009169:Mycobacterium tuberculosis / Q000276:immunology / Q000472:pathogenicity*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D013154:Spleen / Q000382:microbiology / Q000473:pathology; D014397:Tuberculosis, Pulmonary / Q000276:immunology* / Q000473:pathology*
chemical_list: D016207:Cytokines; D004268:DNA-Binding Proteins; D050856:Interferon Regulatory Factor-1; C494258:Irf1 protein, mouse; D010750:Phosphoproteins; D012333:RNA, Messenger; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse