Suppression of BRD4 inhibits human hepatocellular carcinoma by repressing MYC and enhancing BIM expression.

Suppression of BRD4 inhibits human hepatocellular carcinoma by repressing MYC and enhancing BIM expression.
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DOI:
10.18632/oncotarget.6275
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发表时间:
2016-01-19
期刊:
影响因子:
--
通讯作者:
Zhang SJ
Zhang SJ
中科院分区:
其他
文献类型:
--
作者:
Li GQ;Guo WZ;Zhang Y;Seng JJ;Zhang HP;Ma XX;Zhang G;Li J;Yan B;Tang HW;Li SS;Wang LD;Zhang SJ

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Bromodomain 4 (BRD4) 是一种表观遗传调节因子,被抑制时具有抗癌作用。在这项研究中,我们研究了 BRD4 是否可以作为人类肝细胞癌 (HCC) 的治疗靶点。我们发现 BRD4 在 HCC 组织中过度表达。通过 siRNA 或使用 JQ1(一种 BRD4 药物抑制剂)抑制 BRD4,可减少 HCC 细胞系的细胞生长并诱导细胞凋亡,同时还可减缓小鼠 HCC 异种移植肿瘤的生长。 JQ1 处理通过抑制 MYC 表达诱导 G1 细胞周期停滞,从而导致 CDKN1B (P27) 上调。 JQ1 还可以解除促凋亡 BCL2L11 (BIM) 表达的抑制。此外,BIM 的 siRNA 敲低减弱了 JQ1 触发的 HCC 细胞凋亡,表明 BIM 在介导 JQ1 抗 HCC 活性中发挥着重要作用。
Bromodomain 4 (BRD4) is an epigenetic regulator that, when inhibited, has anti-cancer effects. In this study, we investigated whether BRD4 could be a target for treatment of human hepatocellular carcinoma (HCC). We show that BRD4 is over-expressed in HCC tissues. Suppression of BRD4, either by siRNA or using JQ1, a pharmaceutical BRD4 inhibitor, reduced cell growth and induced apoptosis in HCC cell lines while also slowing HCC xenograft tumor growth in mice. JQ1 treatment induced G1 cell cycle arrest by repressing MYC expression, which led to the up-regulation of CDKN1B (P27). JQ1 also de-repressed expression of the pro-apoptotic BCL2L11 (BIM). Moreover, siRNA knockdown of BIM attenuated JQ1-triggered apoptosis in HCC cells, suggesting an essential role for BIM in mediating JQ1 anti-HCC activity.