Ku80 cooperates with CBP to promote COX-2 expression and tumor growth.

Ku80 cooperates with CBP to promote COX-2 expression and tumor growth.
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Ku80与CBP合作促进COX-2表达和肿瘤生长

DOI:
10.18632/oncotarget.3508
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发表时间:
2015-04-10
期刊:
影响因子:
--
通讯作者:
Deng W
Deng W
中科院分区:
其他
文献类型:
--
作者:
Xiao Y;Wang J;Qin Y;Xuan Y;Jia Y;Hu W;Yu W;Dai M;Li Z;Yi C;Zhao S;Li M;Du S;Cheng W;Xiao X;Chen Y;Wu T;Meng S;Yuan Y;Liu Q;Huang W;Guo W;Wang S;Deng W

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环加氧酶-2 (COX-2) 在肺癌的发生和发展中发挥着重要作用。使用链霉亲和素-琼脂糖下拉和蛋白质组学测定,我们鉴定并验证了 Ku80(参与修复断裂 DNA 双链的 Ku 二聚体)作为 COX-2 基因启动子的新结合蛋白。 Ku80 的过表达上调了肺癌细胞中 COX-2 启动子的激活和 COX-2 的表达。通过 siRNA 沉默 Ku80 可下调 COX-2 表达,并抑制体外和异种移植小鼠模型中的肿瘤细胞生长。 Ku80 敲低抑制 ERK 磷酸化,导致 MAPK 通路失活。此外,转录共激活因子CBP与Ku80相互作用并乙酰化Ku80,共同调节COX-2启动子的激活。 CBP 的过度表达增加了 Ku80 乙酰化,从而促进 COX-2 表达和细胞生长。通过 CBP 特异性抑制剂或 siRNA 抑制 CBP 可抑制 COX-2 表达以及肿瘤细胞生长。肺腺癌的组织微阵列免疫组织化学分析显示 Ku80 和 COX-2 水平与临床病理变量之间存在很强的正相关性。 Ku80 的过度表达与肺癌患者的不良预后相关。我们得出结论,Ku80 促进 COX-2 表达和肿瘤生长,是肺癌的潜在治疗靶点。
Cyclooxygenase-2 (COX-2) plays an important role in lung cancer development and progression. Using streptavidin-agarose pulldown and proteomics assay, we identified and validated Ku80, a dimer of Ku participating in the repair of broken DNA double strands, as a new binding protein of the COX-2 gene promoter. Overexpression of Ku80 up-regulated COX-2 promoter activation and COX-2 expression in lung cancer cells. Silencing of Ku80 by siRNA down-regulated COX-2 expression and inhibited tumor cell growth in vitro and in a xenograft mouse model. Ku80 knockdown suppressed phosphorylation of ERK, resulting in an inactivation of the MAPK pathway. Moreover, CBP, a transcription co-activator, interacted with and acetylated Ku80 to co-regulate the activation of COX-2 promoter. Overexpression of CBP increased Ku80 acetylation, thereby promoting COX-2 expression and cell growth. Suppression of CBP by a CBP-specific inhibitor or siRNA inhibited COX-2 expression as well as tumor cell growth. Tissue microarray immunohistochemical analysis of lung adenocarcinomas revealed a strong positive correlation between levels of Ku80 and COX-2 and clinicopathologic variables. Overexpression of Ku80 was associated with poor prognosis in patients with lung cancers. We conclude that Ku80 promotes COX-2 expression and tumor growth and is a potential therapeutic target in lung cancer.
将聚(ADP-核糖)聚合酶-1和KU70/KU80鉴定为S100A9基因表达的转录调节剂。
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