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
中科院分区:
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
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.
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影响因子:
--
作者:
Grote, Jens;Koenig, Simone;Ackermann, Doreen;Sopalla, Claudia;Benedyk, Malgorzata;Los, Marek;Kerkhoff, Claus
通讯作者:
Kerkhoff, Claus
影响因子:
3.8
作者:
Glynn SA;Prueitt RL;Ridnour LA;Boersma BJ;Dorsey TM;Wink DA;Goodman JE;Yfantis HG;Lee DH;Ambs S
通讯作者:
Ambs S
影响因子:
9.2
作者:
Ekambaram, Prasanna;Lambiv, Wanyu;Cazzolli, Rosanna;Ashton, Anthony W.;Honn, Kenneth V.
通讯作者:
Honn, Kenneth V.
影响因子:
3.8
作者:
Asting AG;Carén H;Andersson M;Lönnroth C;Lagerstedt K;Lundholm K
通讯作者:
Lundholm K
DOI:
10.3344/kjp.2014.27.4.365
发表时间:
2014-10
期刊:
The Korean journal of pain
影响因子:
--
作者:
Jung KT;Lim KJ
通讯作者:
Lim KJ