Enhanceosomes as integrators of hypoxia inducible factor (HIF) and other transcription factors in the hypoxic transcriptional response.

Enhanceosomes as integrators of hypoxia inducible factor (HIF) and other transcription factors in the hypoxic transcriptional response.
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DOI:
10.1016/j.cellsig.2013.05.018
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发表时间:
2013-09
影响因子:
4.8
通讯作者:
Hu CJ
Hu CJ
中科院分区:
生物学2区
文献类型:
--
作者:
Pawlus MR;Hu CJ

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缺氧是实体瘤微环境的一个普遍属性,它通过缺氧诱导因子 (HIF) 的 α 亚基(HIF1α 和 HIF2α)的翻译后修饰和稳定来促进基因表达。尽管存在显着相似之处,HIF1 (HIF1α/ARNT) 和 HIF2 (HIF2/ARNT) 激活常见和独特的靶基因,并在癌症生物学中表现出不同的功能。更令人惊讶的是,越来越多的数据表明,HIF1 和/或 HIF2 介导的缺氧反应可以致癌并抑制肿瘤。虽然 HIF 在缺氧反应中的作用已得到充分证实,但最近的数据支持这样的概念:HIF 对于缺氧反应是必要的,但还不够。 HIF 介导的缺氧反应也需要缺氧激活的其他转录因子。 HIF、其他转录因子、辅因子以及HIF和其他转录因子招募的RNA poll II在HIF靶基因的启动子上形成多因子增强体复合物,以激活缺氧诱导基因。重要的是,HIF1 或 HIF2 需要不同的伙伴来激活 HIF1 或 HIF2 靶基因。由于 HIF 增强小体的形成是基因激活以及 HIF1 和 HIF2 在肿瘤生物学中的独特功能所必需的,因此破坏 HIF1 或 HIF2 特异性增强小体复合物可能被证明是肿瘤治疗中的一种有益策略,其中肿瘤生长专门依赖于 HIF1 或 HIF2 活性。
Hypoxia is a prevalent attribute of the solid tumor microenvironment that promotes the expression of genes through posttranslational modifications and stabilization of alpha subunits (HIF1α and HIF2α) of hypoxia-inducible factors (HIFs). Despite significant similarities, HIF1 (HIF1α/ARNT) and HIF2 (HIF2/ARNT) activate common as well as unique target genes and exhibit different functions in cancer biology. More surprisingly, accumulating data indicates that the HIF1- and/or HIF2-mediated hypoxia responses can be oncogenic as well as tumor suppressive. While the role of HIF in the hypoxia response is well established, recent data support the concept that HIF is necessary, but not sufficient for the hypoxic response. Other transcription factors that are activated by hypoxia are also required for the HIF-mediated hypoxia response. HIFs, other transcription factors, co-factors and RNA poll II recruited by HIF and other transcription factors form multifactoral enhanceosome complexes on the promoters of HIF target genes to activate hypoxia inducible genes. Importantly, HIF1 or HIF2 require distinct partners in activating HIF1 or HIF2 target genes. Because HIF enhanceosome formation is required for the gene activation and distinct functions of HIF1 and HIF2 in tumor biology, disruption of the HIF1 or HIF2 specific enhanceosome complex may prove to be a beneficial strategy in tumor treatment in which tumor growth is specifically dependent upon HIF1 or HIF2 activity.
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