CX-5461和多克索鲁比激活了人类心肌细胞中与DNA损伤相关的共享转录反应
相关实验视频
Updated: Jul 20, 2026
08:09
A Doxorubicin-induced Cardiomyopathy Model in Adult Zebrafish
Published on: June 7, 2018
10.3K
Sayan Paul1, José A Gutiérrez1, Alyssa R Bogar1
1Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77555, USA.
G3 (Bethesda, Md.)
|January 16, 2026
概括
一种癌症药物CX-5461通过影响心肌细胞基因可能会损害心脏. 研究人员发现CX-5461诱导心脏细胞的细胞死亡和DNA损伤反应,类似于多克索鲁比.
科学领域:
- 心脏病学 心脏病学
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- CX-5461是一种正在研究的癌症治疗药物.
- 起初CX-5461被确定为RNA聚合酶I抑制剂,但现在被认为可以抑制topoisomeraseIIβ.
- 托皮索马酶IIβ也受到像多克索鲁比辛这样的环素的向,这些环素已知会引起心脏毒性.
研究的目的:
- 为了研究CX-5461.1.的潜在心脏毒性.
- 确定CX-5461对人类诱导的多能干细胞衍生心肌细胞 (iPSC-CMs) 的影响.
主要方法:
- 来自6名患有CX-5461的个体的iPSC-CMs的治疗.
- 评估细胞活力和诱导细胞死亡.
- 转录组分析分析基因表达的变化随着时间的推移.
主要成果:
- 在微分子度下,CX-5461诱导心肌细胞中的细胞死亡.
- 基因表达分析揭示了DNA损伤反应通路的激活,类似于Doxorubicin.
- CX-5461影响了心脏特异性基因和与多克索鲁比诱导心脏毒性相关的基因.
结论:
- CX-5461影响心肌细胞的转录组.
- 这些发现表明,CX-5461可能会引起心脏毒性,因此需要进一步调查.
- 心肌细胞代表了CX-5461潜在的目标外细胞类型.
相关概念视频
01:08Nucleotide Excision Repair
Overview
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:46Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
01:38Nucleotide Excision Repair
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...