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
bioRxiv : the preprint server for biology
|September 30, 2024
概括
诱导性成本刺激器 (ICOS) 在慢性抗原暴露期间限制了CD8 T细胞的反应. 抑制ICOS可以增强抗瘤免疫力,改善T细胞功能,为癌症免疫治疗提供新的途径.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- T细胞耗尽的情况
背景情况:
- PD-1+ CD8 T细胞对于抗瘤免疫是至关重要的,但在持续的抗原刺激过程中可能会耗尽.
- 原始体耗尽的PD-1+ TCF-1+ CD8 T细胞 (Tpex) 维持了耗尽的T细胞种群,是癌症免疫疗法的目标.
- 在慢性抗原暴露期间,诱导性成本刺激器 (ICOS) 在PD-1+CD8 T细胞反应中的作用尚不清楚.
研究的目的:
- 调查ICOS在慢性抗原刺激期间调节PD-1+ CD8 T细胞反应中的功能.
- 确定ICOS信号对Tpex分化和病毒特异性和瘤特异性CD8T细胞的质量的影响.
- 评估ICOS阻塞在慢性感染和癌症模型中的治疗潜力.
主要方法:
- 在慢性病毒感染期间利用ICOS缺乏的小鼠模型.
- 在已确定的慢性感染和肝细胞癌小鼠模型中进行ICOS-Ligand阻塞.
- 分析了CD8 T细胞种群,细胞因子生产和瘤生长动态.
主要成果:
- 缺少ICOS增强了病毒特异性CD8T细胞的数量和质量,通过增加存活率促进了效应器类Tex积累.
- 丢失ICOS信号增强了FoxO1活动,并为Tpex.赋予了类似记忆的特征.
- 在体内,ICOS-Ligand阻断导致了效应器类的Tex扩张,减少了病毒载量,改善了抗瘤CD8 T细胞细胞因子的产生,并延迟了瘤的生长.
结论:
- 在慢性抗原暴露期间,ICOS信号活动限制了CD8 T细胞的反应.
- 抑制ICOS可以通过促进功能效应体样T细胞的产生来增强抗瘤免疫力.
- 针对ICOS是改善癌症免疫疗法的有希望的策略.
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