脱甲基化DNA触发了结直肠癌细胞中细胞自由DNA的释放
Valeria Pessei1, Marco Macagno1, Elisa Mariella2,3
1Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Turin, Italy.
Genome medicine
|October 10, 2024
概括
癌细胞DNA甲基化影响无细胞DNA (cfDNA) 的流失. 较低的甲基化与较高的cfDNA释放相关,可能改善癌症检测液体活检灵敏度.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 遗传学是一种遗传学.
背景情况:
- 使用无细胞DNA (cfDNA) 的液体活检显示出癌症诊断和监测的前景.
- 瘤通过细胞死亡和活性/被动释放释放cfDNA,但机制尚不清楚.
- 基于患者的研究是复杂的,因为瘤负担和正常细胞的DNA释放.
研究的目的:
- 在癌症模型中研究DNA释放的基本机制.
- 为了剖析DNA甲基化在cfDNA脱落中的作用.
- 为了确定影响cfDNA释放变异性的因素.
主要方法:
- 在76个结直肠癌 (CRC) 细胞系中分析了cfDNA释放,细胞循环和细胞死亡.
- 评估了cfDNA释放,扩散和分子特征之间的关联.
- 进行了调节DNA甲基化及其对cfDNA释放的影响的功能实验.
主要成果:
- 较高的cfDNA水平与较慢的细胞循环和增加的细胞死亡相关.
- 非CpG岛屿甲基化表型 (CIMP) 模型显示了较高的cfDNA流失.
- 一个甲基化特征预测了cfDNA释放水平,在独立的细胞系和有机体中得到验证.
- 脱甲基化治疗在体外增加了cfDNA的释放.
结论:
- 癌症细胞系甲基化状态在体外显著影响cfDNA流失.
- 改变的甲基化模式与cfDNA释放水平相关.
- 利用甲基化变化可以提高液体活检试验的灵敏度.
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