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[Role of polymorphonucleocyte-produced leukotriene B4 in Kawasaki disease]
1Department of Pediatrics, Saga Medical School.
Abstract:
It is postulated that inflammatory cells play an important role in the process of developing vasculitis in Kawasaki Disease. LTB4, a 5-lipoxygenase product of arachidonic acid is one of the most potent chemoattractants to inflammatory cells and is produced in large amounts by PMNs. We investigated the role of PMN-derived LTB4 in Kawasaki Disease. Isolated PMNs were obtained from 19 Kawasaki disease patients in three different phases of the illness, (acute phase: 0-12th day, convalescent phase: 13-29th day, restored phase: greater than 30th day). LTB4 synthesis in the convalescent phase was 26.43 +/- 4.2 ng/5 x 10(6) cells, which was significantly higher than those in the acute and restored phases (11.90 +/- 1.91, 13.87 +/- 1.86 ng) and also higher than that in the control subjects (10.65 +/- 1.26 ng: p less than 0.05). No differences were found between two groups with or without coronary lesions. The results imply that activated PMNs during the convalescent phase of illness produce larger amount of LTB4 which may participate in the development of inflammatory process of the disease and that PMN-derived LTB4 plays no significant roles in the development of coronary lesions.
Insights
In Kawasaki disease, neutrophils produce significantly more LTB4 during the convalescent phase. This elevated leukotriene B4 (LTB4) may contribute to inflammation but not coronary artery damage.
Area of Science:
- Immunology
- Rheumatology
- Biochemistry
Context:
- Kawasaki disease (KD) is an acute febrile illness causing vasculitis, particularly in children.
- Inflammatory cells, especially neutrophils (PMNs), are implicated in KD pathogenesis.
- Leukotriene B4 (LTB4), a potent neutrophil chemoattractant, is a key mediator in inflammatory processes.
Purpose:
- To investigate the role of PMN-derived LTB4 in Kawasaki disease.
- To quantify LTB4 synthesis by PMNs during different phases of KD.
- To determine if PMN-derived LTB4 correlates with coronary artery lesions in KD.
Summary:
- PMNs were isolated from 19 KD patients across acute, convalescent, and restored phases.
- LTB4 synthesis was significantly higher in the convalescent phase (26.43 ng) compared to acute (11.90 ng), restored (13.87 ng), and control (10.65 ng) groups (p<0.05).
- No significant difference in LTB4 levels was observed between KD patients with or without coronary lesions.
Impact:
- Findings suggest activated PMNs during KD convalescence produce elevated LTB4, potentially contributing to the inflammatory cascade.
- PMN-derived LTB4 does not appear to be a significant factor in the development of coronary artery abnormalities in Kawasaki disease.
- This research deepens understanding of KD immunopathogenesis and potential therapeutic targets.