Magnetic resonance imaging based on a granzyme B promoter-driven reporter gene expression monitors CAR-T cell activation
10.16016/j.2097-0927.202312100
- VernacularTitle:基于颗粒酶B启动子的磁共振报告基因成像监测CAR-T细胞激活状态
- Author:
Xiaoying NI
1
,
2
;
Yong QIN
;
Xiaoya HE
;
Jie HUANG
;
Xiangmin ZHANG
;
Huiru ZHU
;
Qian HU
;
Jinhua CAI
Author Information
1. 400014 重庆,重庆医科大学附属儿童医院,国家儿童健康与疾病临床医学研究中心,儿童发育疾病研究教育部重点实验室放射科
2. 400014 重庆,重庆医科大学附属儿童医院,国家儿童健康与疾病临床医学研究中心,儿童发育疾病研究教育部重点实验室儿童神经发育与认知障碍重庆市重点实验室
- Keywords:
granzyme B;
ferritin;
reporter gene;
magnetic resonance imaging;
chimeric antigen receptor T cells;
disialoganglioside
- From:
Journal of Army Medical University
2024;46(17):1959-1968
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the feasibility of granzyme B(GB)promoter-controlled ferritin heavy chain(FTH1)reporter gene expression for monitoring the activation status of chimeric antigen receptor T cells(CAR-T)by magnetic resonance imaging(MRI).Methods Cytotoxic T lymphocytes(CTLs)were screened by Ficoll density gradient centrifugation and flow sorting.The GB promoter and FTH1 gene were ligated together with disialoganglioside 2(GD2)CAR,and lentiviral vectors were transfected into CTLs to construct GD2-CAR-T/pGB-FTH1 cells.GD2-CAR-T/pCMV-FTH1,GD2-CAR-T,and T cells served as control cells.CytoTox96@non-radioactive cytotoxicity was used to detect the killing effect of each group of cells after co-culture with human neuroblastoma cells(SK-N-SH).ELISA was employed to detect the coincubation factor as well as the amount of GB secretion.Western blotting,Prussian blue staining and cellular MRI were applied to detect the expression of the FTH1 gene after co-culture.Results CTLs were successfully obtained,and then GD2-CAR-T/pGB-FTH1,GD2-CAR-T/pCMV-FTH1 and GD2-CAR-T cells were constructed.The killing effect,co-incubation factor and GB secretion of the above 3 groups of cells were significantly higher than those of the T cells,and the level of GB expression was highest at day 1,and then decreased in order at day 3 and day 7 after co-culturing with SK-N-SH cells.The relative expression of FTH1 and iron content of the GD2-CAR-T/pGB-FTH1 cells showed the same trend as GB expression,and the MRI signals were gradually increased.There were no significant differences in the relative expression of FTH1,iron content and MRI signals in the GD2-CAR-T/pCMV-FTH1 cells at all time points.No FTH1 expression or iron aggregation was observed in the GD2-CAR-T and T cells groups.Conclusion MRI based on the FTH1 reporter gene driven by the granzyme B promoter can reflect the GB expression level and tumor killing effect of CAR-T cells,which provides a potential real-time visual means to monitor the cell activation status for CAR-T therapy.
