Stromal induction of BRD4 phosphorylation Results in Chromatin Remodeling and BET inhibitor Resistance in Colorectal Cancer

Wenyu Wang, Yen An Tang, Qian Xiao, Wee Chyan Lee, Bing Cheng, Zhitong Niu, Gokce Oguz, Min Feng, Puay Leng Lee, Baojie Li, Zi huan Yang, Yu feng Chen, Ping Lan, Xiao Jian Wu, Qiang Yu

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)

摘要

BRD4, a Bromodomain and Extraterminal (BET) protein family member, is a promising anti-cancer drug target. However, resistance to BET inhibitors targeting BRD4 is common in solid tumors. Here, we show that cancer-associated fibroblast (CAF)-activated stromal signaling, interleukin-6/8-JAK2, induces BRD4 phosphorylation at tyrosine 97/98 in colorectal cancer, resulting in BRD4 stabilization due to interaction with the deubiquitinase UCHL3. BRD4 phosphorylation at tyrosine 97/98 also displays increased binding to chromatin but reduced binding to BET inhibitors, resulting in resistance to BET inhibitors. We further show that BRD4 phosphorylation promotes interaction with STAT3 to induce chromatin remodeling through concurrent binding to enhancers and super-enhancers, supporting a tumor-promoting transcriptional program. Inhibition of IL6/IL8-JAK2 signaling abolishes BRD4 phosphorylation and sensitizes BET inhibitors in vitro and in vivo. Our study reveals a stromal mechanism for BRD4 activation and BET inhibitor resistance, which provides a rationale for developing strategies to treat CRC more effectively.

原文English
文章編號4441
期刊Nature communications
12
發行號1
DOIs
出版狀態Published - 2021 12月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 生物化學、遺傳與分子生物學 (全部)
  • 物理與天文學 (全部)

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