NFκB and AP-1 drive human myometrial IL8 expression.

NFκB and AP-1 drive human myometrial IL8 expression.
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DOI:
10.1155/2012/504952
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发表时间:
2012
影响因子:
4.6
通讯作者:
Bennett PR
Bennett PR
中科院分区:
医学3区
文献类型:
--
作者:
Khanjani S;Terzidou V;Johnson MR;Bennett PR

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子宫表达的趋化因子IL 8显着增加与劳动力的开始,无论是在足月和早产。IL 8启动子含有转录因子核因子-κ B(NFκB)、激活蛋白-1(AP-1)和CCAAT/增强子结合蛋白(CEBP)的结合位点。在这项研究中,我们研究了这些转录因子在IL-1B调节人子宫肌层IL-8基因中的作用。使用染色质免疫沉淀(ChIP)分析,我们发现NFκB、CEBP和AP-1在IL 1 B刺激后均与IL 8启动子结合。为了检查IL 8基因表达中每个位点的相对重要性,对这些位点中的每个进行定点诱变。我们发现NFκB位点对基础和IL 1 B刺激的基因表达是必需的。AP-1位点的突变降低了基础和IL 1B刺激的表达,但程度较小。CEBP位点的突变对基础表达没有影响,但消除了IL 1B应答。NFκB的小干扰RNA(siRNA)沉默显著消除了IL 8对IL 1 B的反应;针对AP-1的siRNA在较小程度上降低了IL 8对IL 1 B的反应,而CEBP的敲低增强了IL 8对IL 1 B的反应。我们的数据证实了NFκB在调节人子宫肌层IL 8中的核心和重要作用。
The uterine expression of the chemokine IL8 increases dramatically with the onset of labour both at term and preterm. The IL8 promoter contains binding sites for the transcription factors nuclear factor-kappa B (NFκB), 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 NFκB, 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 NFκB 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 NFκB 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 NFκB in regulation of IL8 in human myometrium.
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