circNR3C1 Suppresses Bladder Cancer Progression through Acting as an Endogenous Blocker of BRD4/C-myc Complex.

circNR3C1 Suppresses Bladder Cancer Progression through Acting as an Endogenous Blocker of BRD4/C-myc Complex.
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CircNR3C1 通过作为 BRD4/C-myc 复合物的内源性阻断剂抑制膀胱癌进展

DOI:
10.1016/j.omtn.2020.09.016
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发表时间:
2020-12-04
期刊:
Molecular therapy. Nucleic acids
影响因子:
--
通讯作者:
Jiang G
Jiang G
中科院分区:
其他
文献类型:
--
作者:
Xie F;Xiao X;Tao D;Huang C;Wang L;Liu F;Zhang H;Niu H;Jiang G

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含溴结构域蛋白4(Bromodomain-containing protein 4,BRD 4)是转录调控元件的核心组成部分,在肿瘤的发生和侵袭中起着重要作用。然而,调节BRD 4在膀胱癌(BC)中的功能的机制仍然是难以捉摸的。在此,我们鉴定了一个由NR 3C 1基因(circNR 3C 1)产生的外显子环状RNA(circRNA)作为BRD 4/C-myc复合物的调节因子。我们以前的研究表明,BRD 4和C-myc启动子区形成一个复合物,允许C-myc作为一个转录因子的BC进展。在本研究中,机制研究表明,circNR 3C 1可以与BRD 4蛋白相互作用,解离BRD 4/C-myc复合物的形成。在体内,C-myc的异位表达部分逆转了circNR 3C 1诱导的裸鼠移植瘤的发生。总之,这些结果表明,circNR 3C 1通过充当BRD 4/C-myc复合物的内源性阻断剂来抑制BC进展。circNR 3C 1被鉴定为BRD 4/C-myc复合物的新型调节剂。circNR 3C 1可通过抑制BRD 4/C-myc复合物的形成和C-myc激活相关靶基因的转录改变,与BRD 4相互作用抑制BC的发生。
Bromodomain-containing protein 4 (BRD4), the core component of transcriptional regulatory elements, plays a significant role in tumorigenesis and aggressiveness. However, the mechanisms regulating the functions of BRD4 in bladder cancer (BC) still remain elusive. Herein, we identify one exonic circular RNA (circRNA) generated from NR3C1 gene (circNR3C1) as a regulator of BRD4/C-myc complex. Our previous study indicated that BRD4 and C-myc promoter region form a complex, allowing C-myc to function as a transcription factor for BC progression. In the present study, mechanism studies reveal that circNR3C1 could interact with BRD4 protein, dissociating the formation of BRD4/C-myc complex. In vivo, ectopic expression of C-myc partly reverses the tumorigenesis of xenografts circNR3C1-induced in nude mice. Conclusively, these results demonstrate that circNR3C1 inhibits BC progression through acting as endogenous blocker of BRD4/C-myc complex. circNR3C1 is identified as a novel regulator of BRD4/C-myc complex. Mechanistically, circNR3C1 could interact with BRD4 to inhibit the tumorigenesis of BC through restraining the formation of the BRD4/C-myc complex and transcriptional alteration of target genes associated with C-myc activation.
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