相关实验视频
Updated: Jul 17, 2025

10:55
Purification of Ubiquitinated p53 Proteins from Mammalian Cells
Published on: March 21, 2022
2.2K
USP2通过duebiquitination和PD-L1的稳定促进瘤免疫逃避
Zean Kuang1, Xiaojia Liu2, Na Zhang1
1Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China.
Cell death and differentiation
|September 5, 2023
概括
乌比基特异性加工蛋白酶2 (USP2) 在癌细胞中稳定了被编程死亡联体-1 (PD-L1). 抑制USP2降低PD-L1,增强抗瘤免疫力和T细胞介导杀死,表明USP2是治疗点.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 针对瘤细胞的编程死亡干-1 (PD-L1) 上调抑制T细胞细胞毒性通过PD-1参与.
- 了解PD-L1调节机制对于提高PD-L1阻断疗法的疗效至关重要.
研究的目的:
- 确定癌症中PD-L1稳定性的新型调节剂.
- 调查在PD-L1调控中的全素特异性加工蛋白酶2 (USP2) 的作用及其对抗瘤免疫力的影响.
主要方法:
- 使用单导向RNA (sgRNA) 选系统来识别PD-L1调节器.
- 进行了蛋白质相互作用测定和泛化分析,以研究USP2-PD-L1相互作用.
- 评估了USP2耗尽对PD-L1水平的影响,癌细胞对T细胞杀伤的敏感性和小鼠模型中的抗瘤免疫力.
- 对USP2和PD-L1表达相关性分析了临床组织样本.
主要成果:
- 确定USP2作为一种新型调节剂,直接与结直肠和前列腺癌细胞中的PD-L1相互作用和稳定.
- USP2在PD-L1的lysine 270处解结合K48结合的多比基化,防止其降解.
- 在小鼠中,USP2枯竭导致与ER相关的PD-L1降解,增强T细胞介导杀死和抗瘤免疫力.
- 在临床癌症样本中,USP2表达与PD-L1水平有关.
- 结合USP2枯竭与抗PD-1治疗,显示出协同作用的抗瘤效应.
结论:
- USP2在稳定瘤细胞中的PD-L1中起着至关重要的作用,促进免疫逃避.
- 针对USP2是一个有希望的策略,通过减少PD-L1和增强抗瘤免疫力来增强癌症免疫疗法.
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
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
Interactions Between Signaling Pathways
6.3K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.3K
Cancer-Critical Genes II: Tumor Suppressor Genes
7.5K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
7.5K
Loss of Tumor Suppressor Gene Functions
4.9K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.9K
Tumor Immunotherapy
555
Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
555

