通过化学环境变化破坏DNAG四重复的稳定性 在瘤进展期间促进转录
Hisae Tateishi-Karimata1, Keiko Kawauchi1, Naoki Sugimoto1
1Frontier Institute for Biomolecular Engineering Research (FIBER), ‡Faculty of Frontiers of Innovative Research in Science and Technology (FIRST), and §Graduate School of FIRST, Konan University , 17-1-20 minatojima-minamimachi, Kobe 650-0047, Japan.
Journal of the American Chemical Society
|December 30, 2017
概括
水平会影响DNA G-四重复的稳定性,影响基因转录. 癌细胞中较低的会破坏G四重复的稳定性,在瘤进展过程中可能会增加基因转录.
科学领域:
- 分子生物学
- 生物化学
- 癌症研究
背景情况:
- DNA G四重复是对离子条件,特别是 (K+) 度敏感的结构.
- 由于K+通道的过度表达,恶性癌细胞表现出较低的细胞内K+水平,这可能会影响G- 四倍体的稳定性.
研究的目的:
- 研究细胞内化学环境的变化如何影响瘤进展过程中的G-四重体形成和转录.
- 阐明K+度在G-四倍体稳定性中的作用及其对癌细胞基因表达的影响.
主要方法:
- 在体外和细胞模型中进行物理化学研究.
- 在不同的K+度下分析G-四重复形成DNA模板的转录生成.
- 使用针对KCNH1mRNA的siRNA和用G-四重体结合抗体进行免疫光.
主要成果:
- 在体外和正常细胞中:K+度下降降了G-四重复的稳定性和转录的增加.
- 与正常细胞 (MCF-7) 相比,癌细胞 (Ras转化,MDA-MB-231) 的转录水平较高.
- 在瘤进展过程中观察到G- 四倍解离,与K+水平的变化和转录的增加相关.
结论:
- 通过稳定G-四重复结构,K+离子会减弱正常细胞中的癌基因转录.
- 由于癌细胞中的K+水平较低,G-四倍体的不稳定性可能会在瘤进展过程中导致某些富G基因的过度表达.
- 这些发现揭示了细胞内离子度,G-四重复动力学和癌症发展中的基因调节之间的新机制.
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