Incorporation of the YRHQ motif into CD3ζ chain enhances the antitumor activity of HER2-targeted CAR-T cells
DOI:10.3872/j.issn.1007-385x.2022.03.003
- VernacularTitle:CD3ζ链引入YRHQ基序可增强靶向HER2的CAR-T细胞的抗肿瘤活性
- Author:
WANG Tian
1
,
2
;
ZHANG Zhengzheng
1
,
2
;
WANG Xiaofeng
1
,
2
;
ZHANG Zimeng
1
,
2
;
ZHANG Yuqing
1
,
2
;
MA Cuiqing
1
,
2
;
SONG Shuxia
1
,
2
Author Information
1. Department of Immunology
2. Key Laboratory of Immune Mechanism and Intervention for Serious Diseases in Heibei Province, Hebei Medical University, Shijiazhuang 050017, Heibei, China
- Publication Type:Journal Article
- Keywords:
人表皮生长因子受体2;CAR-T细胞;YRHQ基序;STAT3;记忆性T细胞
- From:
Chinese Journal of Cancer Biotherapy
2022;29(3):181-188
- CountryChina
- Language:Chinese
-
Abstract:
[摘 要] 目的:探讨在靶向HER2的CAR的CD3ζ链胞内区引入YRHQ基序对CAR-T细胞的特异性杀伤活性及免疫记忆形成的影响。方法:通过DNA合成获得包含靶向HER2的编码抗原受体H28ζ或H28ζ(YRHQ)的DNA片段,通过慢病毒载体将不同CAR的DNA片段分别转导健康人外周血T细胞,制备靶向HER2的H28ζ-CAR-T及H28ζ(YRHQ)-CAR-T细胞。扩增过程中对不同CAR-T细胞进行计数,FCM检测CAR的表达率。将CAR-T细胞分别与HER2阳性的SKOV3、MDA-MB-453或HER2阴性的MCF-7细胞共培养,LDH释放法检测其杀伤活性,ELISA法检测IL-2、IFN-γ和颗粒酶B的水平,WB法检测STAT3磷酸化水平及免疫检查点分子TIM-3和PD-1的表达,通过FCM检测CCR7、CD45RO的表达,分析CAR-T细胞的表型。结果:H28ζ-CAR-T和H28ζ(YRHQ)-CAR-T细胞扩增能力较好,体外培养7 d时扩增4~5倍。H28ζ-CAR和H28ζ(YRHQ)-CAR表达率分别为(33.3±2.85)%和(28.30±3.2)%。H28ξ(YRHQ)-CAR-T细胞的杀伤活性较H28ζ-CAR-T细胞更高(P<0.05)。经HER2抗原刺激后,与T细胞或H28z-CAR-T细胞比较,H28ξ(YRHQ)-CAR-T细胞的STAT3磷酸化水平较H28ξ-CAR-T细胞明显升高(P<0.01);而两者间PD-1和TIM-3的表达无明显差异。未经抗原刺激的CAR-T细胞CCR7和CD45RO表达与正常T细胞比较差异无统计学意义(均P>0.05),与SKOV3细胞共培养后,与T细胞或H28z-CAR-T细胞比较,H28ξ(YRHQ)-CAR-T细胞中TEM细胞比例明显增加、TCM细胞比例明显减少(均P<0.05)。结论:在CD3胞内区引入YRHQ基序可在一定程度上提高CAR-T细胞的杀伤潜力。
- Full text:20220303.pdf