Elevated serum levels of free interleukin-18 in adult-onset Still's disease

被引：133

作者：

Girard, Charlotte ^{[1
]}

Rech, Juergen ^{[2
]}

Brown, Michael ^{[3
]}

Allali, Daniele ^{[4
]}

Roux-Lombard, Pascale ^{[4
,5
]}

Spertini, Francois ^{[6
]}

Schiffrin, Eduardo J. ^{[7
]}

Schett, Georg ^{[2
]}

Manger, Bernhard ^{[2
]}

Bas, Sylvette ^{[1
,5
]}

del Val, Greg ^{[7
]}

Gabay, Cem ^{[1
]}

机构：

[1] Univ Hosp Geneva, Div Rheumatol, Dept Internal Med Specialties, Geneva, Switzerland

[2] Univ Erlangen Nurnberg, Dept Internal Med 3, Erlangen, Germany

[3] Lyndin Grp Inc, Baltimore, MD USA

[4] Univ Hosp Geneva, Div Immunol & Allergy, Geneva, Switzerland

[5] Univ Geneva, Dept Genet & Lab Med, Geneva, Switzerland

[6] CHU Vaudois, Div Immunol & Allergy, Lausanne, Switzerland

[7] Ecole Polytech Fed Lausanne, Bio AB2, Innovat Pk, Lausanne, Switzerland

来源：

RHEUMATOLOGY | 2016年 / 55卷 / 12期

关键词：

adult-onset Still's disease; free IL-18; IL-18BP; JUVENILE IDIOPATHIC ARTHRITIS; MACROPHAGE ACTIVATION SYNDROME; SYSTEMIC-LUPUS-ERYTHEMATOSUS; IL-18; BINDING-PROTEIN; CYTOKINE PROFILES; INTERFERON-GAMMA; CLASSIFICATION CRITERIA; RHEUMATOID-ARTHRITIS; PATHOLOGICAL TISSUES; REVISED CRITERIA;

D O I：

10.1093/rheumatology/kew300

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

Objective. IL-18 is a pro-inflammatory cytokine of the IL-1 family that is naturally inhibited by IL-18 binding protein (IL-18BP). High levels of IL-18 have been described in the serum of adult-onset Still's disease (AOSD) patients, but only total IL-18 levels (including inactive IL-18 bound to IL-18BP) have been measured. With a specific immunoassay, we aimed to measure free IL-18 serum levels in AOSD patients and other rheumatic diseases. Methods. An ELISA was developed to measure free IL-18. Its sensitivity and specificity were tested by spiking recombinant IL-18 or IL-18BP in serum and PBS supplemented with 5% BSA. The binding affinity of IL-18 to IL-18BP was calculated by titration experiments using the ELISA and by Biacore analysis. Sera of 37 AOSD patients and 138 controls (40 healthy controls, 30 RA, 29 SLE, 21 AS and 18 PsA) were assayed for free IL-18, IL-18BP, total IL-18 and other cytokines. Correlations were performed between free IL-18 and markers of disease activity in AOSD patients. Results. Free IL-18 serum levels were significantly higher in AOSD patients (median 8.89 pg/ml) than in healthy and disease controls (1.37 pg/ml; P < 0.01). Free IL-18 serum levels correlated with AOSD activity. The affinity of IL-18 to IL-18BP was found to be much higher than previously described, with a dissociation constant ranging from 30 to 50 pM. Conclusion. Free IL-18 levels are specifically elevated in AOSD compared with other inflammatory diseases, suggesting that IL-18 represents a potential target for the treatment of AOSD.

引用

页码：2237 / 2247

页数：11

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