Marie-Christin Hoffmann, Giulio Cavalli, Natalie Fadle, Eleonora Cantoni, Evi Regitz, Octavian Fleser, Philipp Klemm, Marina Zaks, Elisabeth Stöger, Corrado Campochiaro, Alessandro Tomelleri, Elena Baldissera, Jörg Thomas Bittenbring, Vincent Zimmer, Jochen Pfeifer, Yvan Fischer, Klaus-Dieter Preuss, Moritz Bewarder, Bernhard Thurner, Sabrina Fuehner, Dirk Foell, Lorenzo Dagna, Christoph Kessel, Lorenz Thurner
BACKGROUND: Adult-onset Still's disease (AOSD) and systemic juvenile idiopathic arthritis (sJIA) resemble a continuum of a rare, polygenic IL-1β-driven disease of unknown etiology. OBJECTIVE: In the present study we sought to investigate a potential role of recently described autoantibodies neutralizing the interleukin-1(IL-1)-receptor antagonist (IL-1-Ra) in the pathogenesis of Still's disease. METHODS: Serum or plasma samples from Still's disease patients (AOSD, n = 23; sJIA, n = 40) and autoimmune and/or inflammatory disease controls (n = 478) were analyzed for autoantibodies against progranulin (PGRN), IL-1Ra, IL-18 binding protein (IL-18BP), and IL-36Ra, as well as circulating IL-1Ra and IL-36Ra levels by ELISA...
January 17, 2024: Journal of Clinical Immunology