scholarly journals The Role of Interleukin 18/Interleukin 18-Binding Protein in Adult-Onset Still’s Disease and Systemic Juvenile Idiopathic Arthritis

2022 ◽  
Vol 11 (2) ◽  
pp. 430
Author(s):  
Charlotte Girard-Guyonvarc’h ◽  
Mathilde Harel ◽  
Cem Gabay
Keyword(s):  
Juvenile Idiopathic Arthritis ◽  
Binding Protein ◽  
Systemic Juvenile Idiopathic Arthritis ◽  
Free Form ◽  
Adult Onset Still’S Disease ◽  
Adult Onset ◽  
Still’S Disease ◽  
Interleukin 18 ◽  
Still's Disease ◽  
Adult Onset Still's Disease

Interleukin 18 (IL-18) is a pro-inflammatory cytokine of the IL-1 family, whose activity is tightly controlled at the level of production, as well as signalization. Notably, it is buffered by its natural inhibitor, IL-18 binding protein (IL-18BP), which is massively present in circulation in normal and in most pathological conditions, thus preventing harmful pro-inflammatory systemic effects of IL-18. IL-18 has long been considered to be involved in the pathophysiology of various inflammatory diseases. However, a first clinical trial using recombinant IL-18BP for the treatment of rheumatoid arthritis and psoriasis gave disappointing results. Direct measurements of unbound, bioactive, free form of circulating IL-18 demonstrated that IL-18 was more specifically involved in adult-onset Still’s disease (AOSD) and systemic juvenile idiopathic arthritis (sJIA) but also in their most severe complication, macrophage activation syndrome (MAS). More importantly, administration of recombinant IL-18BP to patients with AOSD, and sJIA with MAS, showed promising results. This review summarizes available data regarding IL-18 and IL-18BP in AOSD and sJIA in mouse models and humans and shows the importance of IL-18/IL-18BP imbalance in these conditions, leading to the conclusion that IL-18, particularly free IL-18, may be a useful biomarker in these diseases and an interesting therapeutic target.

scholarly journals An Update on the Pathogenic Role of Neutrophils in Systemic Juvenile Idiopathic Arthritis and Adult-Onset Still’s Disease

2021 ◽  
Vol 22 (23) ◽  
pp. 13038
Author(s):  
Ji-Won Kim ◽  
Mi-Hyun Ahn ◽  
Ju-Yang Jung ◽  
Chang-Hee Suh ◽  
Hyoun-Ah Kim
Keyword(s):  
Juvenile Idiopathic Arthritis ◽  
Systemic Juvenile Idiopathic Arthritis ◽  
Immune Defense ◽  
Adult Onset Still’S Disease ◽  
Adult Onset ◽  
Still’S Disease ◽  
Still's Disease ◽  
Wide Range ◽  
Adult Onset Still's Disease

Neutrophils are innate immune phagocytes that play a key role in immune defense against invading pathogens. The main offensive mechanisms of neutrophils are the phagocytosis of pathogens, release of granules, and production of cytokines. The formation of neutrophil extracellular traps (NETs) has been described as a novel defense mechanism in the literature. NETs are a network of fibers assembled from chromatin deoxyribonucleic acid, histones, and neutrophil granule proteins that have the ability to kill pathogens, while they can also cause toxic effects in hosts. Activated neutrophils with NET formation stimulate autoimmune responses related to a wide range of inflammatory autoimmune diseases by exposing autoantigens in susceptible individuals. The association between increased NET formation and autoimmunity was first reported in antineutrophil cytoplasmic antibody-related vasculitis, and the role of NETs in various diseases, including systemic lupus erythematosus, rheumatoid arthritis, and psoriasis, has since been elucidated in research. Herein, we discuss the mechanistic role of neutrophils, including NETs, in the pathogenesis of systemic juvenile idiopathic arthritis (SJIA) and adult-onset Still’s disease (AOSD), and provide their clinical values as biomarkers for monitoring and prognosis.

Serum S100A8/A9, But Not Follistatin-like Protein 1 and Interleukin 18, May Be a Useful Biomarker of Disease Activity in Adult-onset Still’s Disease

2012 ◽  
Vol 39 (7) ◽  
pp. 1399-1406 ◽  
Author(s):  
HYOUN-AH KIM ◽  
JEONG-MI AN ◽  
JIN-YOUNG NAM ◽  
JA-YOUNG JEON ◽  
CHANG-HEE SUH
Keyword(s):  
Disease Activity ◽  
Systemic Disease ◽  
Systemic Juvenile Idiopathic Arthritis ◽  
Adult Onset Still’S Disease ◽  
Adult Onset ◽  
Disease Score ◽  
Still’S Disease ◽  
Interleukin 18 ◽  
Still's Disease ◽  
Adult Onset Still's Disease

Objective.S100A8/A9, follistatin-like protein 1, and interleukin 18 (IL-18) have been suggested as biomarkers of disease activity in patients with systemic juvenile idiopathic arthritis or adult-onset Still’s disease (AOSD). We investigated the clinical significance of these factors in AOSD.Methods.Blood samples were collected from 36 patients with AOSD, 40 patients with rheumatoid arthritis (RA), and 33 healthy controls. Of the patients with AOSD, followup samples were collected from 16 patients after resolution of disease activity.Results.Serum levels of S100A8/A9 (11.77 ± 8.84 μg/ml) in AOSD patients were higher than those in RA patients (3.53 ± 3.43 μg/ml; p < 0.001) and controls (2.49 ± 1.83 μg/ml; p < 0.001). Follistatin-like protein 1 levels in AOSD were not different from those in RA and controls. IL-18 levels in AOSD (7560.3 ± 7577.6 pg/ml) were higher than those in RA (217.7 ± 292.1 pg/ml; p < 0.001) and controls (139.2 ± 86.2 pg/ml; p < 0.001). The sensitivity and specificity of IL-18 for diagnosing AOSD was highest with a cutoff value of 366.1 pg/ml. Serum S100A8/A9 correlated with leukocyte count, erythrocyte sedimentation rate, C-reactive protein, ferritin, and systemic disease score; however, IL-18 correlated only with ferritin and systemic disease score. S100A8/A9 was decreased after disease activity was resolved in followup of AOSD patients (9.96 ± 7.35 μg/ml in active AOSD vs 3.6 ± 4.77 μg/ml in resolved cases; p = 0.001). The change of S100A8/A9 was well correlated with that of systemic disease score.Conclusion.The data suggest that serum S100A8/A9 may be a useful biomarker for evaluating disease activity in patients with AOSD.

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