转录性可塑性促进了对BET抑制的初级和获得性耐药性
Philipp Rathert1, Mareike Roth1, Tobias Neumann1
1Research Institute of Molecular Pathology (IMP), Vienna Biocenter (VBC), 1030 Vienna, Austria.
Nature
|September 15, 2015
概括
通过恢复MYC转录,WNT信号驱动急性髓性白血病 (AML) 中的BET抑制剂的耐药性. 这一发现确定WNT是克服AML治疗耐药性的关键生物标志物和治疗标.
科学领域:
- 癌症学
- 分子生物学
- 癌症遗传学
背景情况:
- 代蛋白和额外终端蛋白 (BET) 抑制剂向BRD4,这是急性髓性白血病 (AML) 的非基因向标.
- 临床试验显示BET抑制剂在血液恶性瘤中的活性,但抵抗机制尚不清楚.
- 鉴定导致BET耐药性的因素对于改善AML治疗至关重要.
研究的目的:
- 研究AML中对BET抑制剂的原发性和获得性耐药性的机制.
- 确定参与BET耐药性的关键分子参与者和途径.
- 验证WNT信号作为BET耐药性的驱动因素和生物标志物.
主要方法:
- 在MLL-AF9;Nras(G12D) 驱动的AML小鼠模型中以染色体为重点的RNAi选.
- 对敏感和耐药小鼠和人类白血病的动态转录特征的分析.
- 动态染色体免疫沉测序和自我转录的活性调节区域测序 (STARR-seq) 来对调节场景进行分析.
主要成果:
- 抑制PRC2复合物意外地促进了AML的BET抑制剂耐药性.
- BET抑制急性抑制MYC,但耐性白血病迅速恢复MYC转录.
- 通过WNT信号激活和招募, 弥补BRD4的损失,
- 抗BET的州表现出重新调整的监管格局,激活MYC增强剂招募WNT机器.
结论:
- 在白血病中,WNT信号被确定为原发性和获得性BET耐药性的驱动因素和潜在生物标志物.
- 转录程序的重新连接,特别是通过WNT信号的MYC恢复,是BET抑制剂耐药性的关键机制.
- 向WNT信号可能会在AML和其他癌症中克服BET抵抗.
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