在固体瘤中,c-Kit信号增强了CAR-T细胞的疗效,通过CD28和IL-2独立的共同刺激
Yuquan Xiong1, Meriem Taleb1, Kyohei Misawa1
1Thoracic Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
Nature cancer
|June 19, 2023
概括
通过利用c-Kit信号传递,针对固体瘤的工程化仿真抗原受体 (CAR) T细胞表现出更好的持久性和有效性. 这种新的方法可以在免疫抑制性瘤环境中增强T细胞功能.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 在瘤学瘤学.
背景情况:
- 化学抗原受体 (CAR) T细胞疗法由于免疫抑制性瘤微环境,对固体瘤的疗效有限.
- 为增强功能性持续性而设计CAR T细胞对于改善治疗结果至关重要.
- 与干性相关的途径c-Kit信号传递被探索为CAR T细胞增强的新策略.
研究的目的:
- 设计利用c-Kit信号传递的CAR T细胞,以改善固体瘤中的抗瘤活性.
- 研究细胞内c-Kit D816V突变 (KITv) 表达对CAR T细胞功能和持久性的影响.
- 在临床前固体瘤模型中评估KITv工程CAR T细胞的治疗潜力.
主要方法:
- 汽车T细胞被设计为无表面表达的突变c-Kit (KITv) 的细胞内表达.
- 功能性测试评估了STAT酸化,增殖,协同刺激 (干扰素-γ介导) 和细胞毒性.
- 在体内有效性被评估在转化增长因子-β丰富和低抗原固体瘤模型.
主要成果:
- KITv CAR T细胞表现出高调的STAT酸化和抗原激活依赖的增殖.
- 强化协同刺激,独立于CD28和IL-2,增加了CAR T细胞细胞毒性.
- 在实体瘤模型中,KITv CAR T 细胞表现出更好的生存率和体内疗效,与第二代 CAR T 细胞相比或更高.
- KITv CAR T细胞对氨酸激酶抑制剂敏感,提供了一个安全开关.
结论:
- 细胞内KITv信号增强了CAR T细胞的功能和持久性,克服了免疫抑制瘤环境.
- KITv CAR T细胞是固体瘤治疗的有效策略,与CD28结合时,作为第三个共刺激信号.
- KITv CAR T 细胞对氨酸激酶抑制剂的敏感性为治疗应用提供了宝贵的安全机制.
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