人性化CD28信号域会影响CD8的激活,耗尽和干状前体
Alexander E Brady1, Shankar Revu1, Dongwen Wu1
1Cornell University, Ithaca NY, USA.
bioRxiv : the preprint server for biology
|March 31, 2025
概括
在小鼠中增强的CD28信号传递模仿人类细胞因子风暴,并影响T细胞的反应. 这项研究揭示了CD28的存在.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- CD28信号传递对T细胞激活和命运至关重要.
- 增强的CD28信号传递可以导致过度的免疫反应.
- 了解CD28在病毒感染中的作用至关重要.
研究的目的:
- 研究"人性化"小鼠模型中增强的CD28信号传递对T细胞反应的影响.
- 探索CD28信号强度在病毒感染和T细胞衰竭中的作用.
- 阐明 CD28介导的T细胞调节的分子机制.
主要方法:
- 人与小鼠的逆向工程方法,以创建具有增强信号的CD28 (A210P) 小鼠.
- 用CD28超激素抗体来评估炎症反应.
- 在急性和慢性病毒感染模型中分析T细胞激活,扩张和耗尽.
- 研究下游信号通路,包括JunB,IL-2和MEK1/2.2.
- 评估干细胞样原始细胞 (Tpex) 的生成和扩张,包括PD-L1阻断.
主要成果:
- CD28(A210P) 的小鼠在接受CD28超激素抗体治疗后表现出促炎反应和细胞因子风暴状的状况.
- 在急性和慢性病毒感染中观察到增强的CD8 T细胞激活和扩张.
- 在CD28(A210P) 小鼠的慢性病毒感染期间发生了加速的T细胞耗尽.
- 观察到Tpex细胞的增强生成和维护,在慢性感染中PD-L1阻塞进一步增加.
- 从机制上讲,CD28 ((A210P) 信号通过MEK1/2.2.通过抑制受体调节了JunB,IL-2和抑制受体.
结论:
- 增强的CD28信号强度在CD8 T细胞激活和反应动态中起着关键作用.
- 增加的CD28信号加快了T细胞在持续的抗原暴露期间的耗尽.
- 这项研究强调了CD28在病毒感染期间促进和维持Tpex细胞的作用.
- "人性化的"PYAP小鼠模型提供了对CD28在人类免疫反应中的功能的见解.
相关概念视频
T Cell Activation and Clonal Selection
596
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...
596
Regulation of Hematopoietic Stem Cells
3.1K
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
3.1K


