利用白血病干细胞中对PI3激酶抑制的表观遗传抵抗机制
Shira G Glushakow-Smith1,2,3,4, Imit Kaur1,4, Simone Sidoli5
1Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY.
bioRxiv : the preprint server for biology
|August 12, 2025
概括
在急性髓性白血病 (AML) 中准白血病干细胞 (LSC) 是具有挑战性的. 一种针对PI3K和EZH1/2的新型组合疗法克服了耐药性,为AML患者提供了一个有前途的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 血液学 血液学 血液学
背景情况:
- 获得的耐药机制和无法向白血病干细胞 (LSCs) 导致急性髓性白血病 (AML) 的不良结果.
- 白血病干细胞 (LSCs) 是AML病变和复发的关键驱动因素.
研究的目的:
- 调查LSCs对酸酸3-激酶 (PI3K) 信号的依赖性.
- 识别PI3K抑制的抵抗机制,并制定克服它们的策略.
主要方法:
- 用同型选择性PI3K抑制来评估LSC易感性.
- 针对PI3K抑制,分析了EZH2/PRC2复合体功能和EZH1/2蛋白水平的变化.
- 使用PI3K和EZH1/2抑制剂的组合疗法在ex vivo和in vivoAML模型中进行了评估.
主要成果:
- LSCs表现出对PI3K向的敏感性,特别是P110α异型.
- PI3K抑制诱导了EZH2/PRC2功能的动态变化,EZH2的下调被确定为一种抵抗机制.
- 观察到EZH1的补偿上调,其抑制使AML细胞对PI3K抑制敏感.
- 在临床前模型中,PI3K和EZH1/2抑制剂的组合有效地克服了获得的耐药性,并实现了持续的AML向.
结论:
- 抑制PI3K是一种可行的策略,用于针对AML中的LSC.
- 与PI3K抑制剂结合向EZH1/2代表了一种有希望的治疗方法,以克服耐药性并改善AML治疗结果.
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