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一个检查点逆转受体调解二分位激活并增强CAR T细胞功能
Daniel Landi1,2,3, Shoba A Navai1,2,3,4, Rebecca M Brock1,2,3
1Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas.
Cancer research communications
|February 20, 2025
概括
工程化仿真抗原受体T细胞 (CART) 在固体瘤中克服PD-1免疫抑制. 将PD-1检查点逆转受体与41BB辅助刺激相结合,可以提高CART对质母细胞瘤和骨肉瘤的疗效和持续性.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 生物技术是生物技术.
背景情况:
- 化学抗原受体T细胞 (CART) 治疗在固体瘤中面临挑战,原因是免疫抑制.
- 效应细胞因子可调节PD-L1免疫检查点在原发性质母细胞瘤,限制CART的疗效.
- 平衡CART功能,持久性和炎症对于治疗成功至关重要.
研究的目的:
- 设计PD-1检查点逆转受体 (CPR) 来抵消固体瘤中PD-L1介导的抑制.
- 评估与HER2特定CARs (CPR/CART) 共表达的CPR在增强抗瘤活性方面的有效性.
- 研究CPR共刺激性内域 (CD28或41BB) 在调节T细胞激活和记忆差异化中的作用.
主要方法:
- 设计了双基斯特龙载体,使HER2特异性CARs与含有CD28或41BB共刺激性内域的CPR共同表达.
- 评估了T细胞激活,细胞因子释放,免疫突触形成和体外代谢参数.
- 在质母细胞瘤和转移性骨肉瘤的异种移植模型中评估了CPR/CART的抗瘤功能.
主要成果:
- 在实验室中,CPR28和CPR41BB都有效抵消了PD-1信号传递.
- 与第一代CAR (CARζ/CPR41BB) 共同表达的CPR41BB在反复的抗原刺激后促进了中央记忆的分化.
- CARζ/CPR41BB T细胞在质母细胞瘤和骨髓瘤异种移植模型中表现出优异的抗瘤功能,具有强大的免疫突触形成和有利的代谢参数.
结论:
- 具有41BB共刺激的CPR分子可以抑制PD-1抑制并优化T细胞激活.
- 这一策略通过改善功能和持久性来提高对固体瘤的CART疗效.
- 在CART设计中利用PD-1/PD-L1等瘤内在信号为改善固体瘤治疗提供了一个有希望的方法.
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