Preclinical study of suicide gene as a safety switch to control CAR-T cell cytotoxicity
DOI：10.3872/j.issn.1007-385x.2021.03.002
- VernacularTitle:自杀基因作为一种“安全性开关”控制CAR-T细胞毒性的临床前研究
- Author:
ZHANG Huihui1
1
;
KONG Qunfang1
1
;
LYU Xiaofei2
2
;
LI Xiang2
2
;
SUN Yutao1
1
;
TAN Yi1,2
1
,
3
Author Information
1. 1. Qilu Cell Therapy Technology Co., Ltd., Jinan 250000, Shandong, China
2. 2. Shandong Yinfeng Life Science Research Institute, Jinan 250000, Shandong, China
3. 2. Shandong Yinfeng Life Science Research Institute, Jinan 250000, Shandong, China
- Publication Type:Journal Article
- Keywords:
chimeric antigen receptor modified T cell (CAR-T cell);
CD19;
safety switch;
induced suicide gene caspase9 (iCasp9);
cytokine release syndrome (CRS);
off-target effect;
K562 cell
- From:
Chinese Journal of Cancer Biotherapy
2021;28(3):225-231
- CountryChina
- Language:Chinese
-
Abstract:
[Abstract] Objective: To investigate whether AP1903, a small-molecule chemical inducer, can terminate the cytotoxicity of CD19CAR-T cells over-expressing iCasp9 suicide gene in vivo and in vitro. Methods: CD19CAR-T cells over-expressing iCasp9 (iCasp9-CD19CAR-T) were constructed and co-incubated with AP1903. Then, the cell phenotype and apoptosis were detected by Flow cytometry, and the iCasp9/CID suicide gene system was verified on K562 and T cells, respectively. The cytotoxicity of iCasp9-CD19CAR-T cells was detected in vivo (survival rate of NCG mice bearing Raji cell transplanted xenograft) and in vitro (cell killing function was detected by Flow cytometry) under the administration of AP1903. Results: Compared with CD19CAR-T cells, iCasp9-CD19CAR-T cells showed in significant difference in proliferation, phenotype and cytotoxicity both in vitro and in vivo (all P>0.05). At 2 h after AP1903 administration, the apoptosis rates of K562 and T cells co-expressing iCasp9 and CD19CAR were (33.8±0.9)% and (27.95±0.35)%, respectively; and at 24 h after AP1903 administration, the apoptosis rates reached 100% in both cell lines. The in vitro cytotoxicity of iCasp9-CD19CAR-T cells induced by AP1903 was significantly lower than that without AP1903 treatment (P<0.01); the 60-day survival rate of mice bearing Raji cell transplanted tumor treated with AP1903-induced iCasp9-CD19CAR-T cells was also significantly lower than those treated with iCasp9-CD19CAR-T cells alone (P<0.01). Conclusion: AP1903 can effectively terminate the cytotoxicity of CD19CAR-T cells over-expressing iCasp9 suicide gene in vitro and in vivo.
- Full text:20210302.pdf
