Persistently activated Stat3 maintains constitutive NF-kappaB activity in tumors.
Persistently activated Stat3 maintains constitutive NF-kappaB activity in tumors.
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DOI:
10.1016/j.ccr.2009.02.015
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发表时间:
2009-04-07
期刊:
影响因子:
50.3
通讯作者:
Yu H
中科院分区:
文献类型:
--
作者:
Lee H;Herrmann A;Deng JH;Kujawski M;Niu G;Li Z;Forman S;Jove R;Pardoll DM;Yu H
NF-κB (RelA) is constitutively active in many cancers where it up-regulates anti-apoptotic and other oncogenic genes. While proinflammatory stimulus-induced NF-κB activation involves IKK-dependent nuclear translocation, mechanisms for maintaining constitutive NF-κB activity in tumors have not been elucidated. We show here that maintenance of NF-κB activity in tumors requires Stat3 that is also frequently constitutively activated in cancer. Stat3 prolongs NF-κB nuclear retention through acetyltransferase p300-mediated RelA acetylation, thereby interfering with NF-κB nuclear export. Stat3-mediated maintenance of NF-κB activity occurs both in cancer cells and in tumor-associated hematopoietic cells. Both murine and human cancers display highly acetylated RelA, which is associated with Stat3 activity. This Stat3/NF-κB interaction is thus central to both the transformed and nontransformed elements in tumors.
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