通过油酸阻碍DNA聚合酶β活动,以抑制基切割修复,并诱导肝细胞中的线粒体功能障碍
Meina Wang1,2, Yannan Qi1, Yu Zhou1
1Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, 1 WenYuan Road, Nanjing, 210023, China.
Cell biochemistry and biophysics
|September 11, 2023
概括
自由脂肪酸 (FFAs) 通过抑制DNA聚合酶β (Pol β) 活性来损害DNA修复. 这导致DNA损伤和线粒体功能障碍,有助于肝脏疾病的发病.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 肝病学 肝病学是一种肝病学.
背景情况:
- 肝脏中的自由脂肪酸 (FFAs) 积累与慢性肝脏疾病 (如非酒精性脂肪肝炎) 有关.
- 来自FFAs的氧化压力有助于肝脏病理,但潜在的机制尚未完全理解.
研究的目的:
- 研究FFAs在肝细胞中诱导毒性的新机制.
- 阐明FFAs对DNA修复活动和线粒体功能的影响.
主要方法:
- 研究了油酸 (OA),一种常见的FFA,对DNA聚合酶β (Pol β) 在体外活性的影响.
- 评估了OA和棕酸 (PA) 对肝细胞中DNA损伤和线粒体功能的影响.
主要成果:
- 发现油酸 (OA) 通过与2'-deoxycytidine-5'-triphosphate竞争来抑制DNA聚合酶β (Pol β) 的活性.
- 甲显著阻碍了基切除修复 (BER) 的效率,导致FFA过载肝细胞中DNA损伤的积累.
- 过度的OA和棕酸 (PA) 诱导了肝细胞中的线粒体功能障碍.
结论:
- FFA积累对DNA修复产生负面影响,因为它抑制了Pol β,这是一种基切除修复 (BER) 中的关键酶.
- 由FFA引起的DNA损伤和线粒体功能障碍是肝病的潜在病原机制.
- 这项研究揭示了FFAs,DNA修复抑制和肝病进展之间的新联系.
相关概念视频
Base Excision Repair
22.5K
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
22.5K
Long-patch Base Excision Repair
7.0K
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.0K
Nucleotide Excision Repair
3.5K
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...
3.5K
Overview of DNA Repair
31.1K
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
31.1K
The Electron Transport Chain
16.9K
The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
16.9K
Base-pairing and DNA Repair
64.8K
64.8K


