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
Yu H
中科院分区:
医学1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

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核因子-受体B(NF-κB,RERA)在许多癌症中具有结构性活性,它上调抗凋亡和其他致癌基因的表达。虽然促炎刺激诱导的NF-κB激活涉及IKK依赖的核转位,但在肿瘤中维持结构性NF-κB活性的机制尚未阐明。我们在这里表明,维持肿瘤中的NF-κB活性需要STAT3,它在癌症中也经常被结构性激活。STAT3通过乙酰化转移酶p300介导的RELA乙酰化,延长了NF-κB的核保留时间,从而干扰了NF-κB的核输出。STAT3介导的NF-κB活性的维持发生在癌细胞和肿瘤相关的造血细胞中。小鼠和人类的癌症都表现出高度乙酰化的RELA,这与STAT3的活性有关。因此,这种STAT3/NF-κB相互作用对肿瘤中转化和未转化的成分都是至关重要的。
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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