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Updated: Aug 9, 2026
Pseudomonas aeruginosa Induced Lung Injury Model
Published on: October 29, 2014
Can pseudomonas infection in experimental animals mimic Kawasaki's disease?
Abstract:
Experiments aimed at producing a model of Kawasaki's disease by injecting animals intraperitoneally with Pseudomonas bacilli are described. Injection of large numbers of bacilli into mice caused rapidly fatal sepsis. With appropriate numbers of organisms, some mice died within 3 days, most remained healthy, while in some an inapparent chronic disease developed. Positive blood cultures were occasionally obtained 4-17 weeks after the slow infection. An alcohol-precipitable polysaccharide, which could be measured by Roe's procedure for levan, was found in 20% of the experimentally infected mice. We suggest that this substance was partly responsible for the course of the infection. Severe vasculitis with little acute inflammatory reaction and carditis with coronary aneurysms were often obtained by injecting mice and guinea-pigs with supraliminal doses of bacilli at the same time as their immune system was impaired by treatment with either nitrogen-mustard or cyclophosphamide. We suggest that pseudomonas infection in immunologically deficient animals may mimic Kawasaki's disease and that a similar mechanism may operate in the natural form of the disease in children.
Insights
Pseudomonas bacilli can induce a Kawasaki
Area of Science:
- Microbiology
- Immunology
- Pathology
Background:
- Kawasaki disease is a pediatric illness characterized by vasculitis.
- The exact etiology of Kawasaki disease remains unknown.
- Investigating infectious agents and immune responses is crucial for modeling the disease.
Purpose of the Study:
- To develop an animal model mimicking Kawasaki disease.
- To explore the role of Pseudomonas bacilli in disease development.
- To investigate the impact of immune suppression on disease manifestation.
Main Methods:
- Intraperitoneal injection of Pseudomonas bacilli into mice and guinea-pigs.
- Administration of immunosuppressive agents (nitrogen-mustard, cyclophosphamide).
- Monitoring for sepsis, chronic infection, and pathological changes.
Main Results:
- High bacterial doses caused sepsis; lower doses led to varied outcomes including chronic infection.
- A polysaccharide substance was detected in infected mice, potentially influencing disease course.
- Immunosuppressed animals developed severe vasculitis and coronary aneurysms, resembling Kawasaki disease.
Conclusions:
- Pseudomonas infection in immunosuppressed animals can serve as a model for Kawasaki disease.
- The findings suggest a potential role for Pseudomonas and immune deficiency in the pathogenesis of Kawasaki disease in children.
- Further research into the identified polysaccharide may elucidate disease mechanisms.
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