免疫刺激RNA RN7SL1使CAR-T细胞能够增强自主和内生免疫功能
Lexus R Johnson1, Daniel Y Lee2, Jacqueline S Eacret2
1Department of Radiation Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; Center for Cellular Immunotherapies, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA; Mark Foundation Center for Immunotherapy, Immune Signaling, and Radiation, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
改造的CAR-T细胞提供RN7SL1RNA以增强抗瘤免疫力并克服抗原损失. 这种策略增强T细胞功能和内生免疫反应,改善固体瘤的排斥.
科学领域:
- 免疫学
- 细胞生物学
- 癌症研究
背景情况:
- 化学抗原受体 (CAR) - T细胞疗法面临诸如瘤透不良,T细胞耗尽和抗原不足等局限性.
- 针对免疫细胞的模式识别受体激素具有挑战性,可能对癌细胞产生有害的非目标作用.
研究的目的:
- 设计CAR-T细胞以向输送RN7SL1,一种内源RNA激动剂,以增强CAR-T细胞对固体瘤的疗效.
- 研究RN7SL1传递对CAR-T细胞功能,免疫微环境调节和内源性抗瘤免疫力的影响.
主要方法:
- CAR-T细胞被设计为通过细胞外囊表达和传递RN7SL1.
- 分析了RN7SL1对CAR- T细胞扩张,分化和免疫细胞调节 (MDSC,DC,骨髓细胞) 的影响.
- 在固体瘤模型中评估了瘤排斥和内源性T细胞反应.
主要成果:
- 设计的CAR-T细胞成功输送了RN7SL1,促进了CAR-T细胞的扩张和效应器记忆的分化.
- 转移的RN7SL1通过限制MDSC发育,降低骨髓细胞中的TGF-β,并增强树突细胞的共刺激特征,选择性地改善了免疫细胞功能.
- 这种方法导致扩大了内源效应记忆和瘤特异性T细胞,即使在CAR抗原丢失和新抗原缺乏的情况下,也使瘤被排斥.
结论:
- 机械化分泌RN7SL1的CAR-T细胞代表了一种提高对固体瘤的CAR-T细胞疗效的新方法.
- 这种方法通过改善CAR-T细胞的持久性,调节瘤微环境,并增强内源性抗瘤免疫力来克服关键的局限性.
- 与RN7SL1同时提供抗原进一步提高治疗结果,特别是在具有有限新抗原的异质瘤中.
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