SWI/SNF复合体控制MYC亚型非典型的形形瘤中的本体学特定的转录因子功能
Cody L Nesvick1, Liang Zhang1, Yuqian Yan1
1Department of Neurological Surgery, Mayo Clinic, Rochester, MN, USA.
Neuro-oncology
|March 23, 2025
概括
在非典型的甲状腺瘤中,SMARCB1的丧失会破坏SWI/SNF复合体的功能,导致异常的转录因子活性. 针对这种残留活动为这些致命的大脑瘤提供了一个新的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 非典型的形形形瘤 (ATRT) 是一种致命的儿科脑瘤,由SMARCB1的损失驱动,这是SWI/SNF染色体重塑复合物的关键组成部分.
- 缺少SMARCB1的癌症由于失去关键增强剂而表现出改变的细胞分化,但SWI/SNF与谱系特异性转录因子 (TFs) 之间的相互作用尚不清楚.
研究的目的:
- 在ATRT中调查SWI/SNF复合体和谱系特定TF之间的相互作用.
- 为了确定由这种相互作用产生的潜在的治疗漏洞.
主要方法:
- 采用了多个omics的方法.
- 在体内验证中使用患者衍生的ATRT细胞和正位异种移植.
主要成果:
- 在ATRT中观察到激活蛋白1 (AP-1) 依赖转录网络的损失.
- 证明SMARCB1是AP-1,TEAD1和ZIC2与增强剂结合的必要条件.
- 显示SMARCB1-依赖的SWI/SNF通过cJUN-依赖的调节电路集成TF功能,这在ATRT-MYC中丢失了.
- 发现,在缺乏SMARCB1的细胞中,TF被隔离到促进体,维持生存计划.
- 用SMARCA4降解剂或AP-1/TEAD抑制剂向促进器-近端TF活性降低了细胞活力和延长了异种移植中的存活时间.
结论:
- SWI/SNF复合体对于特异性TF结合和促进剂和增强剂的活性至关重要.
- 准残留促进器-近端TF功能代表了ATRT中的新型治疗漏洞.
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