PubMed:12746898 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/12746898","sourcedb":"PubMed","sourceid":"12746898","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/12746898","text":"Responses to the proinflammatory cytokines interleukin-1 and tumor necrosis factor alpha in cells derived from rheumatoid synovium and other joint tissues involve nuclear factor kappaB-mediated induction of the Ets transcription factor ESE-1.\nOBJECTIVE: To investigate the expression of the novel Ets transcription factor ESE-1 in rheumatoid synovium and in cells derived from joint tissues, and to analyze the role of nuclear factor kappaB (NF-kappaB) as one of the central downstream targets in mediating the induction of ESE-1 by proinflammatory cytokines.\nMETHODS: ESE-1 protein expression was analyzed by immunohistochemistry using antibodies in synovial tissues from patients with rheumatoid arthritis (RA) and osteoarthritis (OA). ESE-1 messenger RNA (mRNA) levels were analyzed by reverse transcriptase-polymerase chain reaction or Northern blotting in human chondrocytes, synovial fibroblasts, osteoblasts, and macrophages, before and after exposure to interleukin-1beta (IL-1beta), tumor necrosis factor alpha (TNFalpha), or lipopolysaccharide (LPS) with or without prior infection with an adenovirus encoding the inhibitor of nuclear factor kappaB (IkappaB). The wild-type ESE-1 promoter and the ESE-1 promoter mutated in the NF-kappaB site were cloned into a luciferase reporter vector and analyzed in transient transfections. Electrophoretic mobility shift assays (EMSAs) and supershift assays with antibodies against members of the NF-kappaB family were conducted using the NF-kappaB site from the ESE-1 promoter as a probe.\nRESULTS: Immunohistochemical analysis showed specific expression of ESE-1 in cells of the synovial lining layer and in some mononuclear and endothelial cells in RA and OA synovial tissues. ESE-1 mRNA expression could be induced by IL-1beta and TNFalpha in cells such as synovial fibroblasts, chondrocytes, osteoblasts, and monocytes. Transient transfection experiments and EMSAs showed that induction of ESE-1 gene expression by IL-1beta requires activation of NF-kappaB and binding of p50 and p65 family members to the NF-kappaB site in the ESE-1 promoter. Overexpression of IkappaB using an adenoviral vector blocked IL-1beta-induced ESE-1 mRNA expression. Chromatin immunoprecipitation further confirmed that NF-kappaB binds to the ESE-1 promoter in vivo.\nCONCLUSION: ESE-1 is expressed in synovial tissues in RA and, to a variable extent, in OA, and is specifically induced in synovial fibroblasts, chondrocytes, osteoblasts, and monocyte/macrophages by IL-1beta, TNFalpha, or LPS. This induction relies on the translocation of the NF-kappaB family members p50 and p65 to the nucleus and transactivation of the ESE-1 promoter via a high-affinity NF-kappaB binding site. ESE-1 may play a role in mediating some effects of proinflammatory stimuli in cells at sites of 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