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Protection against pulmonary infection with Klebsiella pneumoniae in mice by interferon-gamma through activation of phagocytic cells and stimulation of production of other cytokines. 2001

Kanako Yoshida, and Tetsuya Matsumoto, and Kazuhiro Tateda, and Kou Uchida, and Shiro Tsujimoto, and Yoichiro Iwakura, and Keizo Yamaguchi

The study was designed to determine the role of interferon (IFN)-gamma in inflammatory responses against experimentally induced pneumonia caused by Klebsiella pneumoniae. The host immunological responses in IFN-gamma gene knockout (IFN-gamma(-/-)) mice and immunocompetent control mice were compared. K. pneumoniae strain T-113 was inoculated intranasally into anaesthetised mice to induce pneumonia. Infected control mice survived significantly longer than infected IFN-gamma(-/-) mice. Viable bacterial counts in lungs and blood abruptly increased in IFN-gamma(-/-) mice; in contrast, a gradual decrease in the number of bacteria was noted in control mice. During the early stages of infection, the concentrations of interleukin (IL)-1beta and IL-6 in broncho-alveolar lavage fluid and IL-1beta in serum of IFN-gamma(-/-) mice were significantly lower than in control mice. During the late stage of infection, serum IL-6 level in IFN-gamma(-/-) mice was significantly higher than in control mice. These results suggest that the defective immunological host response, including inflammatory cytokine production caused by deficiency of IFN-gamma, is one of the mechanisms that allow the progression of pulmonary infection to systemic septicaemia.

UI MeSH Term Description Entries
D007371 Interferon-gamma The major interferon produced by mitogenically or antigenically stimulated LYMPHOCYTES. It is structurally different from TYPE I INTERFERON and its major activity is immunoregulation. It has been implicated in the expression of CLASS II HISTOCOMPATIBILITY ANTIGENS in cells that do not normally produce them, leading to AUTOIMMUNE DISEASES. Interferon Type II,Interferon, Immune,gamma-Interferon,Interferon, gamma,Type II Interferon,Immune Interferon,Interferon, Type II
D007700 Kinetics The rate dynamics in chemical or physical systems.
D007710 Klebsiella Infections Infections with bacteria of the genus KLEBSIELLA. Infections, Klebsiella,Infection, Klebsiella,Klebsiella Infection
D007711 Klebsiella pneumoniae Gram-negative, non-motile, capsulated, gas-producing rods found widely in nature and associated with urinary and respiratory infections in humans. Bacillus pneumoniae,Bacterium pneumoniae crouposae,Hyalococcus pneumoniae,Klebsiella pneumoniae aerogenes,Klebsiella rhinoscleromatis
D008168 Lung Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood. Lungs
D010586 Phagocytes Cells that can carry out the process of PHAGOCYTOSIS. Phagocyte,Phagocytic Cell,Phagocytic Cells,Cell, Phagocytic,Cells, Phagocytic
D001992 Bronchoalveolar Lavage Fluid Washing liquid obtained from irrigation of the lung, including the BRONCHI and the PULMONARY ALVEOLI. It is generally used to assess biochemical, inflammatory, or infection status of the lung. Alveolar Lavage Fluid,Bronchial Lavage Fluid,Lung Lavage Fluid,Bronchial Alveolar Lavage Fluid,Lavage Fluid, Bronchial,Lavage Fluid, Lung,Pulmonary Lavage Fluid,Alveolar Lavage Fluids,Bronchial Lavage Fluids,Bronchoalveolar Lavage Fluids,Lavage Fluid, Alveolar,Lavage Fluid, Bronchoalveolar,Lavage Fluid, Pulmonary,Lavage Fluids, Alveolar,Lavage Fluids, Bronchial,Lavage Fluids, Bronchoalveolar,Lavage Fluids, Lung,Lavage Fluids, Pulmonary,Lung Lavage Fluids,Pulmonary Lavage Fluids
D004195 Disease Models, Animal Naturally-occurring or experimentally-induced animal diseases with pathological processes analogous to human diseases. Animal Disease Model,Animal Disease Models,Disease Model, Animal
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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