PP2A负面调节NK细胞T-bet表达和抗瘤效应器功能
Yui Shinzawa1, Daisuke Hara1, Yuki Shinguryo1
1Section of Host Defences, Institute of Natural Medicine, University of Toyama, Toyama, Japan.
International immunology
|October 15, 2024
概括
蛋白酸酶2A (PP2A) 在自然杀手 (NK) 细胞中负面调节T-bet表达. 抑制PP2A通过mTOR信号增强NK细胞的抗瘤免疫力,改善癌症治疗结果.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
背景情况:
- T-bet对于自然杀手 (NK) 细胞的抗瘤免疫力至关重要.
- 在NK细胞中T-bet表达的调节尚未完全理解.
研究的目的:
- 为了确定T-bet表达的NK细胞内在调节者.
- 阐明这些调节剂影响NK细胞功能的机制.
主要方法:
- T-bet-luciferase 记者测试选. 这是一个非常好的测试.
- 使用蛋白酸酶2A (PP2A) 抑制剂 (PP2Ai) 或PP2A siRNA的治疗.
- 在NK细胞中分析T-bet,B粒酶和IFN-γ的表达.
- 对mTOR和S6酸化的西部斑点分析.
- 评估NK细胞细胞毒性和体内抗瘤活性.
主要成果:
- PP2A抑制 (PP2Ai或siRNA) 在NK细胞中调高了T-bet表达.
- 在小鼠NK细胞中,PP2Ai治疗增加了T-bet,B粒酶和IFN-γ.
- PP2Ai增强了NK细胞的细胞毒性和IFN-γ的产生.
- 在B16黑色素瘤模型中,PP2Ai治疗抑制了肺转移.
- 观察到的效应取决于NK细胞和mTOR信号传递.
结论:
- PP2A作为T-贝特表达和NK细胞效应因子功能的负调节剂.
- 抑制PP2A通过依赖mTOR的途径增强了抗瘤免疫力.
- 准PP2A可能是癌症免疫治疗的新策略.
更多相关视频
相关概念视频
Abnormal Proliferation
4.5K
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...
4.5K
Negative Regulator Molecules
35.2K
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.
35.2K
Cytotoxic T Cells-mediated Immune Response
857
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
857
Tumor Immunotherapy
488
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.
488
T Cell Types and Functions
959
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
959
T Cell Activation and Clonal Selection
679
T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Naive T cells that have not yet encountered an antigen express two primary CD...
679


