Compensatory response of IL-1 gene knockout mice after pulmonary infection with Klebsiella pneumoniae.
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| Abstract |
This study was designed to determine the role of interleukin (IL)-1 in the inflammatory response against experimentally induced pneumonia caused by Klebsiella pneumoniae. The host immune responses of IL-1 gene knockout (IL-1 KO) mice and immunocompetent wild-type (WT) mice were compared after pulmonary infection with K. pneumoniae. There were no significant differences between the survival rates and viable bacterial counts in lungs and blood of IL-1 KO and WT mice after pulmonary infections under different conditions. Histopathological analysis showed a similar inflammatory response in both groups of mice. However, in the early stage of infection, the level of tumour necrosis factor alpha (TNF-alpha) in homogenized lungs of IL-1 KO mice was significantly higher than in WT mice. To determine the role of endogenous TNF-alpha in the recovery of the defence mechanism in IL-1 KO mice, mice were treated with an anti-TNF-alpha mAb before infection with K. pneumoniae. The results revealed a significantly lower survival rate of anti-TNF-alpha mAb-treated IL-1 KO mice than BSA-treated IL-1 KO mice. The data suggest that compensatory production of TNF-alpha in IL-1 KO mice contributes to the host defence against K. pneumoniae infection.
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| Authors | Masaaki Tanabe, Tetsuya Matsumoto, Kazutoshi Shibuya, Kazuhiro Tateda, Shuichi Miyazaki, Akio Nakane, Yoichiro Iwakura, Keizo Yamaguchi |
| Journal | Journal of medical microbiology (J Med Microbiol) Vol. 54 Issue Pt 1 Pg. 7-13 (Jan 2005) ISSN: 0022-2615 [Print] England |
| PMID | 15591249 (Publication Type: Journal Article) |
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