Role of interleukin-1 in the pulmonary immune response during Pseudomonas aeruginosa pneumonia - PubMed (original) (raw)
. 2002 Feb;282(2):L285-90.
doi: 10.1152/ajplung.00461.2000.
Affiliations
- PMID: 11792633
- DOI: 10.1152/ajplung.00461.2000
Free article
Role of interleukin-1 in the pulmonary immune response during Pseudomonas aeruginosa pneumonia
Marc J Schultz et al. Am J Physiol Lung Cell Mol Physiol. 2002 Feb.
Free article
Abstract
Pneumonia is associated with elevated concentrations of the proinflammatory cytokine interleukin (IL)-1 in the pulmonary compartment. To study the role of IL-1 in the pathogenesis of Pseudomonas pneumonia, IL-1 receptor type 1 gene-deficient (IL-1R -/-) mice and wild-type mice were intranasally inoculated with Pseudomonas aeruginosa. The absence of the IL-1 signal attenuated the outgrowth of Pseudomonas in lungs, as reflected by an increasing number of colony-forming units (cfu) during Pseudomonas pneumonia in wild-type mice and a concurrently decreasing number of cfu during pulmonary infection in IL-1R -/- mice (P < 0.05, IL-1R -/- mice vs. wild-type mice). Influx of neutrophils was decreased in bronchoalveolar lavage fluids in IL-1R -/- mice compared with wild-type mice. Similarly, lung levels of cytokines (tumor necrosis factor-alpha, IL-6) and chemokines (macrophage inflammatory protein-2 and KC) were lower in IL-1R -/- mice 24 h postinoculation. Consistent with results obtained in IL-1R -/- mice, treatment of wild-type mice with IL-1R antagonist also diminished outgrowth of Pseudomonas when compared with wild-type mice treated with vehicle (P < 0.05). These results demonstrate that an absence or reduction in endogenous IL-1 activity improves host defense against Pseudomonas pneumonia while suppressing the inflammatory response.
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