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The aim of this study was to determine whether the inflammatory environment in arthritic joints has an impact on monocytic gp130 surface expression and the extent to which regulatory processes in the synovial fluid (SF) can be reproduced in an in vitro model.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Flow cytometry and live cell imaging were used to measure the cell surface expression and internalization of gp130. STAT\u20103 phosphorylation was monitored by flow cytometry and Western blotting.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In patients with juvenile idiopathic arthritis (JIA), levels of cell surface gp130 expression in SF monocytes were reduced compared to those in peripheral blood (PB) monocytes. These reduced levels were reproduced when PB monocytes from healthy donors were stimulated with SF, and this reduction was dependent on p38 MAPK. The induction of p38 by IL\u20101\u03b2 in PB monocytes interfered with IL\u20106 signaling due to the reduced cell surface expression of gp130.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>These results suggest that p38\u2010mediated proinflammatory stimuli induce the down\u2010regulation of gp130 on monocytes and thus restrict gp130\u2010mediated signal transduction. This regulatory mechanism could be of relevance to processes in the inflamed joints of patients with JIA.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.38245","type":"journal-article","created":{"date-parts":[[2013,10,31]],"date-time":"2013-10-31T19:04:50Z","timestamp":1383246290000},"page":"470-478","source":"Crossref","is-referenced-by-count":12,"title":["The p38\u2010Mediated Rapid Down\u2010Regulation of Cell Surface gp130 Expression Impairs Interleukin\u20106 Signaling in the Synovial Fluid of Juvenile Idiopathic Arthritis Patients"],"prefix":"10.1002","volume":"66","author":[{"given":"Nora","family":"Honke","sequence":"first","affiliation":[{"name":"RWTH Aachen University Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kim","family":"Ohl","sequence":"additional","affiliation":[{"name":"RWTH Aachen University Aachen 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