在乳腺癌中,HDAC1和REST的负调节丧失有助于MAD1过度表达
Sarah E Copeland1,2, Boya Chen1, Avtar Roopra3
1Molecular and Cellular Pharmacology Graduate Training Program, University of Wisconsin-Madison, Madison 53705, WI.
Molecular biology of the cell
|June 4, 2025
概括
线索性停止缺陷1 (MAD1) 在乳腺癌中过度表达. 瘤抑制剂REST的丧失导致MAD1的增加,促进瘤生长.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 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:
- 线粒关闭缺陷1 (MAD1) 对于螺旋组装检查点至关重要,并且在乳腺癌中过度表现,与预后不佳相关.
- 在临床前模型中,MAD1过度表达驱动了瘤发生,但癌症中其上调的机制仍然难以捉摸.
研究的目的:
- 阐明MAD1L1的转录调节,并确定驱动乳腺癌中MAD1过度表达的机制.
主要方法:
- 生物信息学分析以预测监管元素和转录因子.
- 记者分析评估促进者的活动.
- 染色体免疫沉 (ChIP) 测定蛋白质定位到促进体.
- 对乳腺癌患者样本进行基因表达相关性的分析.
主要成果:
- 确定了MAD1L1促销者的440-bp区域作为一个压制性元素.
- 发现基因组脱乙酶1 (HDAC1) 局部化到MAD1L1促进体,其抑制增加了MAD1的表达.
- RE1抑制转录因子 (REST) 与抑制区域结合,其过度表达减少了MAD1的表达.
- 在乳腺癌患者样本中观察到REST和MAD1L1mRNA水平之间的负相关性.
结论:
- 瘤抑制剂REST通常通过招募HDAC1.1来抑制MAD1L1转录.
- 乳腺癌中REST的丧失导致MAD1L1的抑制减少,导致MAD1过度表达.
- 这一途径代表了MAD1在乳腺癌发育和进展中的升级调节的潜在机制.
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