辅助刺激分子ICOS限制了已耗尽的PD-1+CD8+ T细胞的类似记忆的特性和功能
Etienne Humblin1, Isabel Korpas1, Nataliya Prokhnevska1
1Marc and Jennifer Lipschultz Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Immunology and Immunotherapy, ISMMS, New York, NY 10029, USA.
Immunity
|July 8, 2025
概括
持续诱导性共刺激器 (ICOS) 信号限制在慢性抗原暴露期间的CD8+T细胞反应. 抑制ICOS可以提高T细胞质量,并改善慢性感染和癌症模型中的免疫治疗结果.
科学领域:
- 免疫学和癌症研究
- 消耗T细胞和免疫疗法
背景情况:
- 在持续的抗原刺激期间,原始体耗尽的CD8+ T (Tpex) 细胞保持反应.
- Tpex细胞对于免疫疗法的有效性至关重要,它们对被编程细胞死亡-1 (PD-1) 阻断作出反应.
- 诱导性辅助刺激器 (ICOS) 在调节PD-1+ CD8+ T细胞中的作用尚不清楚.
研究的目的:
- 调查ICOS在慢性抗原暴露期间调节CD8+T细胞耗尽中的作用.
- 为了确定ICOS调制对Tpex细胞分化和功能的影响.
- 评估ICOS抑制与PD-1阻断结合的治疗潜力.
主要方法:
- 在慢性感染期间对具有内在ICOS缺陷的小鼠的病毒特异性CD8+T细胞进行分析.
- 评估Tpex细胞分化,转录因子活性 (FoxO1) 和效应器功能.
- 在慢性感染和肝细胞癌的小鼠模型中评估ICOS-ligand (ICOSL) 阻塞和ICOS抑制.
主要成果:
- 内在ICOS缺陷增加了病毒特异性CD8+T细胞的数量和质量.
- 失去ICOS增强了分叉盒O1 (FoxO1) 活动,并在Tpex细胞中促进了类似记忆的特征.
- 在ICOSL阻塞和ICOS抑制扩大了效应器类PD-1+CD8+T细胞,降低了病毒载量,并与PD-1阻塞结合改善了瘤控制.
结论:
- 在慢性抗原暴露期间,持续的ICOS辅助刺激限制了CD8+ T细胞的反应.
- 抑制ICOS可以增强CD8+T细胞功能,并改善对PD-1阻断基免疫疗法的反应.
- 准ICOS是改善癌症免疫疗法和治疗慢性感染的有希望的策略.
相关概念视频
Cytotoxic T Cells-mediated Immune Response
2.4K
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...
2.4K
T Cell Activation and Clonal Selection
5.5K
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...
5.5K
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
T Cell Types and Functions
1.4K
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...
1.4K
Cells of the Adaptive Immune Response
4.5K
The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
4.5K
Special Features of Adaptive Immunity
1.1K
The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
1.1K


