抗原主导层次在瘤中形成TCF1+ CD8 T细胞原型
Megan L Burger1, Amanda M Cruz2, Grace E Crossland1
1David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Cell
|September 17, 2021
概括
瘤新抗原反应主要是由稳定的MHC结合剂. 一个对较弱抗原有反应的T细胞子集,虽然最初对免疫疗法有希望,但被发现功能失调且对免疫检查点阻断无反应.
科学领域:
- 免疫学
- 癌症研究
- T细胞生物学
背景情况:
- CD8 T细胞对瘤新抗原的反应对癌症免疫力至关重要.
- 对多种新抗原和T细胞功能的反应之间的相互作用仍然不太清楚.
- 观察到一种抗原反应超越其他抗原的免疫主导性,但其机制和影响需要进一步研究.
研究的目的:
- 研究CD8T细胞对不同瘤新抗原的反应之间的相互作用.
- 了解免疫主导对T细胞功能和瘤控制的影响.
- 确定影响T细胞反应的因素及其免疫治疗潜力.
主要方法:
- 小鼠肺腺癌模型.
- 分析CD8T细胞扩张和表型 (TCF1+,CCR6+,TC17).
- 对免疫检查点 (ICB) 反应的评估.
- 对人类癌症样本和测序数据集的分析.
- 调节T细胞反应的疫苗接种策略.
主要成果:
- 在瘤中免疫主导是由具有最稳定的MHC结合的新抗原建立的.
- 对亚主导抗原反应的T细胞表现出TCF1+原生类型,最初与ICB反应相关.
- 一个功能障碍的TCF1+细胞子集,标志着CCR6和TC17的分化,限制了ICB的益处.
- 人类癌症中存在CCR6+TCF1+细胞,但与ICB反应不一致.
- 疫苗接种消除了CCR6+TCF1+细胞,并增强了亚主导T细胞的反应.
结论:
- 瘤新抗原的免疫主导性取决于MHC结合.
- 亚主导的T细胞反应具有前代潜力,但可能受到功能障碍的子集的阻碍.
- 向CCR6+TCF1+细胞可能是提高免疫疗法的策略.
- 优化并发的新抗原反应有助于增强抗瘤免疫力.
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