具有ICOS表达性的调节性T细胞影响抗瘤CTL群体的组成
Nikoletta Diamantopoulos1,2, Joanna Li1,2, Antoine Bouchard1,3
1Institut de Recherches Cliniques de Montréal, Montreal, Quebec, Canada.
Journal of immunology (Baltimore, Md. : 1950)
|July 12, 2024
概括
在小鼠中从调节性T细胞 (Tregs) 中去除ICOS可以减少黑色素瘤瘤的生长. 这表明Tregs上的ICOS可能会抑制抗瘤免疫力,影响癌症免疫治疗策略.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- T细胞生物学T细胞生物学
背景情况:
- 诱导性T细胞共刺激器 (ICOS) 在抗瘤免疫中的作用是复杂的和有争议的.
- 了解调节性T细胞 (Tregs) 中的ICOS功能对于开发有效的癌症免疫疗法至关重要.
研究的目的:
- 研究ICOS在瘤微环境中的调节性T细胞 (Tregs) 中的特定作用.
- 确定Tregs中的ICOS信号如何影响瘤进展和细胞毒性T淋巴细胞 (CTL) 反应.
主要方法:
- 使用黑色素瘤肺转移小鼠模型.
- 在Tregs或所有T细胞中选择性删除ICOS的生成小鼠.
- 分析了瘤负担,免疫细胞透以及CTL标记物 (granzyme B, perforin).
- 进行了单细胞转录组分析,以确定CD8+ T细胞子集的变化.
主要成果:
- 在Tregs中选择性淘汰ICOS降低了瘤负担并增加了CD4+/Treg和CD8+/Treg比率.
- 在所有T细胞中删除ICOS并没有影响瘤负担.
- 特雷格特异性ICOS缺陷增强了表达大酶B和穿孔素的CD8+CTLs.
- 单细胞RNA测序揭示了一种转向Eomes高CD8+T细胞的转变.
结论:
- 由Tregs表达的ICOS抑制了细胞毒性CD8+T细胞成熟和抗瘤活性.
- 针对Tregs中的ICOS可以提高癌症免疫疗法的疗效.
- 使用ICOS激动剂的癌症免疫疗法可能在Treg-low瘤中更有效,或者与Treg-depleting策略相结合.
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