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The IL8 promoter contains binding sites for the transcription factors nuclear factor-kappa B (NF<jats:italic>\u03ba<\/jats:italic>B), activator protein-1 (AP-1), and CCAAT\/enhancer-binding protein (CEBP). In this study we investigated the roles of these transcription factors in IL1B regulation of the IL8 gene in human myometrium. Using chromatin immune precipitation (ChIP) assay, we showed that each of NF<jats:italic>\u03ba<\/jats:italic>B, CEBP, and AP-1 binds to the IL8 promoter upon IL1B stimulation. To examine the relative importance of each site in IL8 gene expression, site-directed mutagenesis of each of these sites was performed. We found that the NF<jats:italic>\u03ba<\/jats:italic>B site was essential for basal and IL1B-stimulated gene expression. Mutation of the AP-1 site reduced both basal and IL1B-stimulated expression but to a lesser extent. Mutation of the CEBP site had no effect upon basal expression but eliminated the IL1B response. Small interfering RNA (siRNA) silencing of NF<jats:italic>\u03ba<\/jats:italic>B abolished the IL8 response to IL1B significantly; siRNA against AP-1 reduced it to a lesser extent whilst knockdown of CEBP enhanced the response. Our data confirms a central and essential role for NF<jats:italic>\u03ba<\/jats:italic>B in regulation of IL8 in human myometrium.<\/jats:p>","DOI":"10.1155\/2012\/504952","type":"journal-article","created":{"date-parts":[[2012,5,29]],"date-time":"2012-05-29T07:11:06Z","timestamp":1338275466000},"page":"1-8","source":"Crossref","is-referenced-by-count":67,"title":["NF<i>\u03ba<\/i>B and AP-1 Drive Human Myometrial IL8 Expression"],"prefix":"10.1155","volume":"2012","author":[{"given":"Shirin","family":"Khanjani","sequence":"first","affiliation":[{"name":"Parturition Research Group, Institute of Reproductive and Developmental Biology, Imperial College London, London W12 0NN, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vasso","family":"Terzidou","sequence":"additional","affiliation":[{"name":"Parturition Research Group, Institute of Reproductive and Developmental Biology, Imperial College London, London W12 0NN, 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