Elevated serum levels of free interleukin-18 in adult-onset Still's disease
Girard C, Rech J, Brown M, Allali D, Roux-Lombard P, Spertini F, Schiffrin EJ, Schett G, Manger B, Bas S, Del Val G, Gabay C (2016)
Publication Type: Journal article
Publication year: 2016
Journal
Book Volume: 55
Pages Range: 2237-2247
Journal Issue: 12
DOI: 10.1093/rheumatology/kew300
Abstract
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.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.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.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.
Authors with CRIS profile
Georg Schett
Lehrstuhl für Innere Medizin III
Bernhard Manger
Professur für Rheumatologie und Klinische Immunologie
Involved external institutions
École Polytechnique Fédérale de Lausanne (EPFL)
Switzerland (CH)
Geneva University Hospitals / Hôpitaux universitaires de Genève (HUG)
Switzerland (CH)
Lyndon Group
United States (USA) (US)
Lausanne University Hospital / Centre hospitalier universitaire vaudois (CHUV)
Switzerland (CH)
Switzerland (CH)
Geneva University Hospitals / Hôpitaux universitaires de Genève (HUG)
Switzerland (CH)
Lyndon Group
United States (USA) (US)
Lausanne University Hospital / Centre hospitalier universitaire vaudois (CHUV)
Switzerland (CH)
How to cite
APA:
Girard, C., Rech, J., Brown, M., Allali, D., Roux-Lombard, P., Spertini, F.,... Gabay, C. (2016). Elevated serum levels of free interleukin-18 in adult-onset Still's disease. Rheumatology, 55(12), 2237-2247. https://dx.doi.org/10.1093/rheumatology/kew300
MLA:
Girard, Charlotte, et al. "Elevated serum levels of free interleukin-18 in adult-onset Still's disease." Rheumatology 55.12 (2016): 2237-2247.
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