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A novel mouse model for septic arthritis induced by Pseudomonas aeruginosa

Journal article
Authors Tao Jin
Majd Mohammad
Zhicheng Hu
Y. Fei
Edward R.B. Moore
Rille Pullerits
Abukar Ali
Published in Scientific Reports
Volume 9
ISSN 2045-2322
Publication year 2019
Published at Institute of Medicine, Department of Rheumatology and Inflammation Research
Centre for antibiotic resistance research, CARe
Institute of Biomedicine, Department of Infectious Medicine
Language en
Keywords collagen-induced arthritis, staphylococcal arthritis, monocyte, chemoattractant, corneal infection, t-lymphocytes, macrophages, neutrophils, interleukin-17a, inflammation, secukinumab, Science & Technology - Other Topics
Subject categories Rheumatology and Autoimmunity


Septic arthritis is one of the most aggressive joint diseases. Although caused predominantly by S. aureus, Gram-negative bacteria, Pseudomonas aeruginosa among them, account for a significant percentage of the causal agents of septic arthritis. However, septic arthritis caused by P. aeruginosa has not been studied thus far, due to lack of an animal model. NMRI mice were inoculated with different doses of P. aeruginosa. The clinical course of septic arthritis and radiological changes of joints were examined. Furthermore, the host molecular and cellular mechanisms involved in P. aeruginosa-induced septic arthritis were investigated. Inoculation of mice with P. aeruginosa caused septic arthritis in a dose-dependent manner. Neutrophil depletion led to higher mortality and more severe joint destruction (p < 0.01). In contrast, monocyte depletion resulted in higher mortality (p < 0.05) but similar arthritis severity compared to controls. Mice depleted of CD4+ T-cells inoculated with P. aeruginosa displayed less severe bone damage (p < 0.05). For the first time, a mouse model for P. aeruginosa septic arthritis is presented. Our data demonstrate that neutrophils play a protective role in P. aeruginosa septic arthritis. Monocytes/macrophages, on the other hand, are only essential in preventing P. aeruginosa-induced mortality. Finally, CD4+ T-cells are pathogenic in P. aeruginosa septic arthritis.

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