{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T06:55:54Z","timestamp":1780469754882,"version":"3.54.1"},"reference-count":33,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2005,12,12]],"date-time":"2005-12-12T00:00:00Z","timestamp":1134345600000},"content-version":"vor","delay-in-days":3359,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arthritis & Rheumatism"],"published-print":{"date-parts":[[1996,10]]},"abstract":"Abstract<\/jats:title>Objective<\/jats:italic>. To assess the expression of tumor necrosis factor \u03b1 (TNF \u03b1), TNF \u03b2, and their receptors in synovia of patients with juvenile rheumatoid arthritis (JRA) and juvenile spondylarthropathy (JSpA), and to determine similarities with and differences from adult RA.<\/jats:p>Methods<\/jats:italic>. Twenty\u2010eight synovial tissue samples from patients with JRA, 6 from patients with JSpA, and 6 from patients with RA, selected for the presence of inflammatory infiltrates, were analyzed for the expression of TNF \u03b1, TNF \u03b2, and their receptors (p55 and p75 TNFR), utilizing the dual approach of reverse transcriptase\u2014polymerase chain reaction and immunohistochemistry analysis.<\/jats:p>Results<\/jats:italic>. The presence of both TNF \u03b1 and TNF \u03b2 expression was demonstrated in most JRA and JSpA tissues, although samples from patients with pauci\u2010articular JRA had somewhat lesser amounts of these cytokines. TNF \u03b2 expression correlated significantly with the occurrence of lymphocytic aggregates in tissues. Staining with monoclonal antibodies specific for the p55 and p75 receptors revealed that a diverse range of cell types expressed the receptors, with the most intense p55 staining on vascular endothelial cells. In the vast majority of synovial tissues, far greater numbers of cells expressed the p55 form of the receptor than the p75 form.<\/jats:p>Conclusion<\/jats:italic>. JRA and JSpA synovia are characterized by the presence of TNF \u03b1, TNF \u03b2, and cells expressing TNFR. These findings provide further evidence that TNF, through autocrine\/paracrine mechanisms, may amplify local inflammation, leading to joint destruction. The prominence of TNF \u03b2 in the synovium in particular subgroups of JRA patients and in JSpA patients may be a distinguishing feature of these diseases.<\/jats:p>","DOI":"10.1002\/art.1780391013","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T11:51:14Z","timestamp":1171453874000},"page":"1703-1710","source":"Crossref","is-referenced-by-count":142,"title":["Patterns of expression of tumor necrosis factor \u03b1, tumor necrosis factor \u03b2, and their receptors in synovia of patients with juvenile rheumatoid arthritis and juvenile spondylarthropathy"],"prefix":"10.1002","volume":"39","author":[{"given":"Alexei A.","family":"Grom","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin 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