在患有MLL3/4-COMPASS表观遗传调节器突变的癌症中治疗代谢脆弱性的治疗向
Zibo Zhao1,2, Kaixiang Cao1,2, Jun Watanabe1,3
1Department of Biochemistry and Molecular Genetics.
The Journal of clinical investigation
|May 30, 2023
概括
在MLL3/4表观遗传酶中发生的突变会在 purin 合成中产生漏洞. 具有这些突变的癌细胞对药物隆美特雷克索尔敏感,提供了一个新的治疗点.
科学领域:
- 癌症生物学 癌症生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 代谢途径 代谢途径
背景情况:
- 表观遗传变化,特别是染色体修饰酶的突变,如COMPASS家族成员MLL3和MLL4,都与人类疾病有关,包括癌症.
- 这些突变的功能后果和由此产生的细胞依赖性尚未完全理解,这阻碍了治疗的发展.
研究的目的:
- 调查由MLL3和MLL4丢失引起的细胞漏洞,重点关注受损的增强器功能.
- 确定潜在的治疗策略,以针对MLL3/4突变的癌症中的这些依赖性.
主要方法:
- 在没有MLL3/4的小鼠胚胎干细胞 (mESCs) 中进行CRISPR脱落选.
- 代谢活动测定,RNA测序 (RNA-Seq) 和双重质标记 (TMT) 蛋白质分析.
- 在癌症模型中使用纯素合成抑制剂洛美特雷克索尔进行体外和体内药物敏感性测试.
主要成果:
- 缺乏MLL3/4的mESCs表现出合成杀伤性,抑制了 purin 和 pyrimidine 核酸合成.
- 在MLL3/4缺乏细胞中观察到一种代谢转向增加的 purin 合成.
- 缺乏MLL3/4的细胞对隆美特雷克索尔的敏感性增强,具有明显的基因表达变化.
- 确定MLL1/COMPASS补偿作为一个关键机制.
- 具有MLL3和/或MLL4突变的瘤对洛美特雷克索尔表现出显著的敏感性.
结论:
- 丧失MLL3/4功能导致对氨酸合成有针对性的代谢依赖.
- 洛美特雷克索尔代表了一种有前途的治疗药物,用于携带MLL3/4突变的癌症.
- 了解表观遗传因子缺陷为癌症治疗开发提供了分子洞察力.
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