共查询到20条相似文献,搜索用时 31 毫秒
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Cyclooxygenase (COX) exists as two isoforms: COX-1, which is constitutively expressed in most cell types; and COX-2, which is inducible by lipopolysaccharide (LPS) and cytokines in a variety of cell types. Although previous studies have implicated two DNA binding proteins, interferon regulatory factor (IRF)-1 and IRF-2, in the regulation of LPS- and IFN-gamma-induced COX-2, their effects in vivo and in vitro are not well-defined. Using real-time PCR, COX-2 gene expression in the livers and lungs of mice challenged in vivo and in macrophages stimulated with LPS in vitro was investigated in wild-type and in IRF-1 and IRF-2 knockout mice. In response to 35 mg/kg LPS, IRF-1-, but not IRF-2-deficient mice, exhibited much poorer induction of COX-2 gene expression in both the livers and lungs. In vitro, COX-2 mRNA levels were also poorly induced in IRF-1-deficient macrophages, while IRF-2- deficient macrophages exhibited higher levels than in normal macrophages. IRF-1 and IRF-2 were confirmed to activate and repress expression of the COX-2 promoter, respectively, in a transient transfection system and the role of specific DNA binding sites confirmed by site-specific mutagenesis. Collectively, these data provide evidence for an important role for IRF-1 in vivo and in vitro and for IRF-2 in vitro in the regulation of COX-2 expression by LPS. 相似文献
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The TRAP/Mediator coactivator complex interacts directly with estrogen receptors alpha and beta through the TRAP220 subunit and directly enhances estrogen receptor function in vitro 总被引:1,自引:0,他引:1
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Kang YK Guermah M Yuan CX Roeder RG 《Proceedings of the National Academy of Sciences of the United States of America》2002,99(5):2642-2647
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The mediator complex functions as a coactivator for GATA-1 in erythropoiesis via subunit Med1/TRAP220
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Stumpf M Waskow C Krötschel M van Essen D Rodriguez P Zhang X Guyot B Roeder RG Borggrefe T 《Proceedings of the National Academy of Sciences of the United States of America》2006,103(49):18504-18509
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The activator-recruited cofactor/Mediator coactivator subunit ARC92 is a functionally important target of the VP16 transcriptional activator 总被引:1,自引:0,他引:1
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Yang F DeBeaumont R Zhou S Näär AM 《Proceedings of the National Academy of Sciences of the United States of America》2004,101(8):2339-2344