细胞内K+限制T细胞耗尽,并保持抗瘤功能
Camille Collier1,2, Kelly Wucherer1,2, Matthew McWhorter1,2
1Division of Surgical Oncology, Department of Surgery, Oregon Health & Science University, Portland, Oregon.
Cancer immunology research
|December 8, 2023
概括
改变CD8+T细胞中的细胞内水平会影响其功能和疲劳. 通过基因编辑降低,虽然最初会导致功能障碍,但可以通过K+或抗氧化剂来控制,以恢复抗癌活性.
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:
- 在瘤微环境中,T细胞功能经常受到损害.
- 在瘤中细胞外 (K+) 的升高可以抑制CD8+T细胞信号传递和效应器功能.
- Na+/K+ ATPase (编码为Atp1a1) 是一个关键的载体,调节T细胞中的细胞内K+.
研究的目的:
- 研究基因降低细胞内K+对CD8+T细胞功能和疲劳的影响.
- 探索减轻癌症中K+介导的T细胞功能障碍的策略.
主要方法:
- 在CRISPR-Cas9基因编辑中破坏CD8+T细胞中的Atp1a1位点.
- 测量细胞内K+水平,膜潜力 (Vm),Ca2+流入和信号通路活动.
- 评估T细胞耗尽标记,反应性氧物种 (ROS) 生产和抗氧化作用.
- 在小鼠黑色素瘤模型中评估T细胞持久性和抗瘤活性.
主要成果:
- 破坏Atp1a1降低了细胞内K+和增加了膜潜力,尽管减少了Ca2+的流入.
- 缺乏Atp1a1的T细胞在老鼠和人类细胞中表现出强力信号过活和疲劳的表型.
- 外源性K+或抗氧化剂治疗在体外阻止了ROS积累和T细胞耗尽.
- 在体内,ATP1a1缺乏的T细胞表现出受损的持久性和抗瘤功效.
结论:
- 在CD8+ T细胞中,细胞内K+的遗传减少会导致复杂的功能变化,包括疲劳.
- 涉及K +补充或抗氧化剂治疗的策略可以改善T细胞功能障碍并恢复抗瘤活性.
- 在癌症免疫治疗中,平衡细胞内K+水平对于优化T细胞效应因子功能至关重要.
相关概念视频
Cytotoxic T Cells-mediated Immune Response
923
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...
923
Tumor Immunotherapy
529
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.
529
T Cell Activation and Clonal Selection
741
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...
741
Cell-mediated Immune Responses
68.3K
Overview
68.3K
Cells of the Innate Immune Response
1.7K
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
1.7K
T Cell Types and Functions
1.0K
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...
1.0K


