PMID- 12654774 OWN - NLM STAT- MEDLINE DCOM- 20030512 LR - 20210526 IS - 0019-9567 (Print) IS - 1098-5522 (Electronic) IS - 0019-9567 (Linking) VI - 71 IP - 4 DP - 2003 Apr TI - Interleukin-18 impairs the pulmonary host response to Pseudomonas aeruginosa. PG - 1630-4 AB - Interleukin-18 (IL-18) is a potent cytokine with many different proinflammatory activities. To study the role of IL-18 in the pathogenesis of Pseudomonas pneumonia, IL-18-deficient (IL-18(-/-)) and wild-type mice were intranasally inoculated with Pseudomonas aeruginosa. IL-18 deficiency was associated with reduced outgrowth of Pseudomonas in the lungs and diminished dissemination of the infection. In addition, pulmonary inflammation (histopathology) and levels of tumor necrosis factor alpha, IL-6, and macrophage inflammatory protein-2 in lungs and plasma were lower in IL-18(-/-) mice. Consistent with results obtained for IL-18(-/-) mice, treatment of wild-type mice with a neutralizing IL-18 binding protein-immunoglobulin G Fc fusion construct also attenuated outgrowth of Pseudomonas compared with that for mice treated with a control protein. These results demonstrate that the presence of endogenous IL-18 activity facilitates inflammatory responses in the lung during Pseudomonas pneumonia, concurrently impairing bacterial clearance. FAU - Schultz, Marc J AU - Schultz MJ AD - Laboratory of Experimental Internal Medicine, Department of Intensive Care Medicine, C3-326, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands. m.j.schultz@amc.uva.nl FAU - Knapp, Sylvia AU - Knapp S FAU - Florquin, Sandrine AU - Florquin S FAU - Pater, Jennie AU - Pater J FAU - Takeda, Kiyoshi AU - Takeda K FAU - Akira, Shizuo AU - Akira S FAU - van der Poll, Tom AU - van der Poll T LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Infect Immun JT - Infection and immunity JID - 0246127 RN - 0 (Cytokines) RN - 0 (Interleukin-18) SB - IM MH - Animals MH - Cytokines/blood MH - Female MH - Interleukin-18/*physiology MH - Lung/*immunology/microbiology/*pathology MH - Mice MH - Mice, Inbred C57BL MH - Pneumonia, Bacterial/*immunology/microbiology/pathology MH - Pseudomonas Infections/*immunology/microbiology/pathology MH - Pseudomonas aeruginosa/*immunology PMC - PMC152024 EDAT- 2003/03/26 05:00 MHDA- 2003/05/13 05:00 PMCR- 2003/04/01 CRDT- 2003/03/26 05:00 PHST- 2003/03/26 05:00 [pubmed] PHST- 2003/05/13 05:00 [medline] PHST- 2003/03/26 05:00 [entrez] PHST- 2003/04/01 00:00 [pmc-release] AID - 0886 [pii] AID - 10.1128/IAI.71.4.1630-1634.2003 [doi] PST - ppublish SO - Infect Immun. 2003 Apr;71(4):1630-4. doi: 10.1128/IAI.71.4.1630-1634.2003.