相关实验视频
Updated: Jun 4, 2025

10:55
Purification of Ubiquitinated p53 Proteins from Mammalian Cells
Published on: March 21, 2022
2.1K
USP33 调节DNA损伤反应和致癌症通过降解和稳定p53来调节
Yuqi Zhu1,2,3, Zixiang Chen1,2, Kaifeng Niu1,2
1China National Center for Bioinformation, Beijing, China.
Cell proliferation
|December 18, 2024
概括
脱基酶USP33稳定了瘤抑制剂p53,增强了DNA损伤反应. USP33表现出抗瘤活性,这是通过在淘汰赛小鼠中减少肝癌发生的证据.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 生物化学 生物化学
背景情况:
- 关于de-ubiquitinase USP33在人类癌症中的作用有争议,在体外研究中发现了相互矛盾的结果.
- 缺少USP33在致癌作用的体内证据,阻碍了对其作用的清晰理解.
研究的目的:
- 调查USP33在DNA损伤反应和癌症中的体内功能作用.
- 阐明USP33影响瘤抑制剂p53稳定性和活性的机制.
主要方法:
- 研究了USP33与p53在体外DNA损伤条件下的相互作用.
- 评估了USP33耗尽对p53无化和稳定性的影响.
- 分析了USP33对野生类型和突变p53.3癌细胞增殖的影响.
- 在化学致癌模型中生成并研究肝细胞特异性USP33淘汰赛小鼠.
主要成果:
- USP33与p53直接相互作用,在DNA损伤后调解其去乌比基因化和稳定.
- USP33的耗尽增加了p53的无处不在,导致p53的不稳定和DNA损伤反应受损.
- 根据p53突变状态,USP33沉默对癌细胞增殖有不同的影响.
- USP33淘汰赛小鼠对二甲基尼托拉胺诱导的肝癌的敏感性增加.
结论:
- 通过调节p53.3,USP33在维持基因组稳定性方面发挥着至关重要的作用.
- USP33在体内表现出抗瘤活性,特别是在肝癌发生的背景下.
- 作为瘤抑制剂的USP33的功能通过其与p53.5的相互作用和稳定而得到介导.
相关概念视频
Abnormal Proliferation
4.4K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.4K
DNA Damage can Stall the Cell Cycle
9.0K
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...
9.0K
Negative Regulator Molecules
35.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.1K
Covalently Linked Protein Regulators
6.8K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
6.8K
Regulated Protein Degradation
7.1K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.1K
Nucleotide Excision Repair
3.4K
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...
3.4K

