设计第五代CAR T细胞以克服PD-L1介导的免疫抑制在肺癌中
Yupanun Wutti-In1, Piriya Luangwattananun2, Nunghathai Sawasdee2
1Division of Transfusion science, Department of Medical Technology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai 50200, Thailand; Cell engineering for Cancer Therapy Research Group, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
一种新的CAR T细胞疗法,抗FRα-CAR5,被设计用于阻止PD-L1,显示出对肺癌细胞的增强活性. 这种方法可以改善免疫抑制瘤微环境中的CAR T细胞功能.
科学领域:
- 在瘤学瘤学.
- 免疫治疗是一种免疫疗法.
- 生物技术是生物技术.
背景情况:
- 卡尔-T细胞疗法在血液癌症中表现有前途,但由于免疫抑制性瘤微环境 (TME),在固体瘤中面临挑战.
- 在非小细胞肺癌 (NSCLC) 中,程序死亡联体1 (PD-L1) 的上调有助于TME介导的免疫抑制,阻碍了CAR T细胞的疗效.
研究的目的:
- 开发和评估一种新的抗叶酸受体α (FRα) CAR T细胞疗法,称为anti-FRα-CAR5,旨在分泌阻断PD-L1的单链可变片段 (scFv).
- 评估抗FRα-CAR5在TME中克服PD-L1介导免疫抑制的潜力,以改善NSCLC治疗.
主要方法:
- 人类T淋巴细胞经过基因工程,使用一种病毒载体来表达抗FRα-CAR5,具有第四代CAR骨干和由阿特佐利祖马布衍生的分泌的抗PD-L1scFv.
- 使用感染过的HEK293T细胞证实了抗FRα-CAR的表面表达.
- 测试了分泌的抗PD-L1 scFv的结合亲和力和抑制活性,针对肺腺癌细胞系和PD-L1单克隆抗体.
主要成果:
- 改造的抗FRα-CAR5 T细胞证明了抗PD-L1 scFv的成功表面表达和分泌.
- 分泌的抗PD-L1 scFv对PD-L1.1表现出显著的抑制活性 (>80%).
- 与对照的CAR T细胞 (抗FRα-CAR4) 相比,抗FRα-CAR5的T细胞在体外显示出对FRα和PD-L1表达性肺癌细胞系的扩张和细胞毒性.
结论:
- 第五代抗FRα-CAR5 T细胞疗法代表了一种有前途的策略,用于提高PD-L1丰富的瘤微环境中的CAR T细胞疗效.
- 这些发现支持对抗FRα-CAR5T细胞进行进一步的临床前研究,作为NSCLC患者潜在的治疗选择.
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