杜比基因酶USP7稳定了HER2的表达,并促进了乳腺癌的进展
Xiaoyue He1, Xiaohong Xia2, Ziying Lei2
1Guangzhou Institute of Cancer Research, the Affiliated Cancer Hospital, Guangzhou Medical University, Guangzhou 510095, PR China; Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation, School of Basic Medical Sciences, Guangzhou Medical University, Guangzhou 511436, PR China.
概括
研究人员发现USP7二维基因酶 (DUB) 在HER2阳性乳腺癌中稳定HER2蛋白. 抑制USP7降低了HER2水平,减缓了癌症生长,并建议USP7作为潜在的治疗点.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- HER2 (人类表皮生长因子受体2) 过度表达在乳腺癌中很常见,但其精确的机制尚不清楚.
- 虽然全方位蛋白酶系统 (UPS) 降解HER2,但尚未确定涉及的特定二基因酶 (DUB).
- 针对HER2的向疗法是有效的,这凸显了了解HER2调节的必要性.
研究的目的:
- 确定负责乳腺癌中HER2调节的DUB.
- 研究USP7在HER2蛋白稳定性和乳腺癌进展中的作用.
- 评估USP7作为HER2阳性乳腺癌的潜在治疗标.
主要方法:
- 使用基于细胞的测定方法 (MTS,西斑,Co-IP,殖民地形成,RT-qPCR,EDU,流细胞计,免疫光) 和异种移植模型.
- 在临床乳腺癌样本中评估USP7表达.
- 研究了USP7和HER2之间的相互作用,以及它对HER2无化和蛋白质水平的影响.
主要成果:
- USP7在HER2阳性乳腺癌中表达高,并且与HER2表达呈正相关.
- 删除或抑制USP7降低了HER2蛋白的丰度,导致细胞循环停止和抑制瘤生长在体外和体内.
- USP7直接与HER2相互作用,减少其无处不在并稳定其表达.
- HER2过度表达部分挽救了USP7抑制引起的生长抑制.
- 在HER2+乳腺癌患者中,USP7过度表达与预后不佳相关.
结论:
- USP7 作为 HER2 的 DUB 功能,稳定 HER2 阳性乳腺癌中的表达.
- 抑制USP7代表了对HER2阳性乳腺癌的有前途的治疗策略.
- USP7是HER2+乳腺癌的潜在预后生物标志物和治疗标.
相关概念视频
Abnormal Proliferation
4.6K
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...
4.6K
Regulated Protein Degradation
7.7K
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...
7.7K
Export of Misfolded Proteins out of the ER
3.9K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.9K
The Proteasome
1.2K
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
1.2K
Anaphase Promoting Complex
3.0K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
3.0K
Covalently Linked Protein Regulators
7.5K
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....
7.5K


