BRD4 facilitates replication stress-induced DNA damage response.
BRD4 facilitates replication stress-induced DNA damage response.
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DOI:
10.1038/s41388-018-0194-3
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发表时间:
2018-07
期刊:
影响因子:
8
通讯作者:
Chen H
中科院分区:
文献类型:
--
作者:
Zhang J;Dulak AM;Hattersley MM;Willis BS;Nikkilä J;Wang A;Lau A;Reimer C;Zinda M;Fawell SE;Mills GB;Chen H
Previous reports have demonstrated that select cancers depend on BRD4 to regulate oncogenic gene transcriptional programs. Here, we describe a novel role for BRD4 in DNA damage response (DDR). BRD4 associates with and regulates the function of pre-replication factor CDC6 and plays an indispensable part in DNA replication checkpoint signaling. Inhibition of BRD4 by JQ1 or AZD5153 resulted in a rapid, time-dependent reduction in CHK1 phosphorylation and aberrant DNA replication re-initiation. Furthermore, BRD4 inhibition sensitized cancer cells to various replication stress-inducing agents, and synergized with ATR inhibitor AZD6738 to induce cell killing across a number of cancer cell lines. The synergistic interaction between AZD5153 and AZD6738 is translatable to in vivo ovarian cell-line and patient-derived xenograft models. Taken together, our study uncovers a new biological function of BRD4 and provides mechanistic rationale for combining BET inhibitors with DDR-targeted agents for cancer therapy.
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