CHD4 Promotes Breast Cancer Progression as a Coactivator of Hypoxia-Inducible Factors

被引:38
作者
Wang, Yijie [1 ]
Chen, Yan [1 ,7 ]
Bao, Lei [1 ]
Zhang, Bo [1 ]
Wang, Jennifer E. [1 ]
Kumar, Ashwani [2 ]
Xing, Chao [2 ,3 ,4 ]
Wang, Yingfei [1 ,5 ]
Luo, Weibo [1 ,6 ]
机构
[1] Univ Texas Southwestern Med Ctr Dallas, Dept Pathol, 5323 Harry Hines Blvd, Dallas, TX 75390 USA
[2] Univ Texas Southwestern Med Ctr Dallas, Eugene McDermott Ctr Human Growth & Dev, Dallas, TX 75390 USA
[3] Univ Texas Southwestern Med Ctr Dallas, Dept Bioinformat, Dallas, TX 75390 USA
[4] Univ Texas Southwestern Med Ctr Dallas, Dept Populat & Data Sci, Dallas, TX USA
[5] Univ Texas Southwestern Med Ctr Dallas, Dept Neurol & Neurotherapeut, Dallas, TX 75390 USA
[6] Univ Texas Southwestern Med Ctr Dallas, Dept Pharmacol, Dallas, TX USA
[7] Jinan Univ, Sch Med, Guangzhou, Peoples R China
关键词
HIF; BINDS;
D O I
10.1158/0008-5472.CAN-20-1049
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Recruitment of RNA polymerase II to hypoxia-inducible factor (HIF) target genes under normoxia is a prerequisite for HIF-mediated transactivation. However, the underlying mechanism of this recruitment remains unknown. Here we report that chromodomain helicase DNA-binding protein 4 (CHD4) physically interacts with alpha and beta subunits of HIF1 and HIF2 and enhances HIF-driven transcriptional programs to promote breast cancer progression. Loss of HIF1/2 alpha abolished CHD4-mediated breast tumor growth in mice. In breast cancer cells under normoxia, CHD4 enrichment at HIF target gene promoters increased RNA polymerase II loading through p300. Hypoxia further promoted CHD4 binding to the chromatin via HIF1/2 alpha, where CHD4 in turn enhanced recruitment of HIF1 alpha, leading to HIF target gene transcription. CHD4 was upregulated and correlated with HIF target gene expression in human breast tumors; upregulation of CHD4 and other known HIF coactivators in human breast tumors was mutually exclusive. Furthermore, CHD4 was associated with poor overall survival of patients with breast cancer. Collectively, these findings reveal a new fundamental mechanism of HIF regulation in breast cancer, which has clinical relevance. Significance: This study identifies CHD4 as a HIF coactivator and elucidates the fundamental mechanism underlying CHD4-mediated HIF transactivation in breast tumors.
引用
收藏
页码:3880 / 3891
页数:12
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