功能性记忆T细胞来自耗尽的克隆,并通过检查点封锁扩展
Colin J Raposo1,2, Patrick K Yan1,2, Andy Y Chen1,3
1Department of Pathology, Stanford University, Stanford, CA, USA.
bioRxiv : the preprint server for biology
|February 24, 2025
概括
耗尽的CD8+ T细胞 (Tex) 在慢性感染后可以形成功能性记忆细胞. 免疫检查点阻塞疗法促进了这些记忆T细胞的发展,为癌症免疫疗法提供了潜力.
科学领域:
- 免疫学 免疫学 免疫学
- T细胞生物学T细胞生物学
- 癌症免疫疗法癌症免疫疗法
背景情况:
- 免疫检查点阻塞 (ICB) 有助于T细胞清除瘤,改善患者的生存率.
- 在长期暴露和清除抗原后,耗尽的CD8+T细胞 (Tex) 形成记忆的能力尚不清楚.
研究的目的:
- 为了研究慢性抗原暴露后耗尽的CD8+ T细胞的记忆形成能力.
- 确定从Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.Tex.
- 评估免疫检查点封锁对Tex衍生的记忆形成的影响.
主要方法:
- 在抗原特异性T细胞上进行了纵向单细胞RNA测序,T细胞受体测序和ATAC测序.
- 血统追踪被用来追踪Tex-derived记忆克隆的起源和回忆反应.
- 患有慢性淋巴细胞胆膜炎病毒 (LCMV) 感染的小鼠用αPD-L1.1治疗.
主要成果:
- 一个强大的记忆CD8+T细胞群,类似于中央记忆T细胞 (Tcm),在慢性LCMV感染清除后形成.
- 德克斯衍生的记忆克隆被确定为一个独特的血统,持续长期并在重新挑战时扩展.
- αPD-L1疗法优先扩展克隆,在慢性感染后产生Tcm.
结论:
- 长期刺激的T细胞可以分化为真正的功能性记忆T细胞,类似于急性感染的T细胞.
- 这一途径对通过检查点封锁和疫苗接种增强癌症免疫记忆具有重要意义.
- 织品是长期免疫记忆的可行来源,对适应性免疫至关重要.
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