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English Abstract
Journal Article
[Construction and identification of a stable CT26 cell line expressing CD19-FLUC-GFP].
Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology 2024 Februrary 26
Solid tumors lack well-defined targets for chimeric antigen receptor T-cell (CAR-T) therapy. Therefore, introducing a known target molecule, CD19, into solid tumor cell lines via lentiviral transduction to investigate the cytotoxicity of CD19 CAR-T cells can potentially support CAR-T cell therapy against solid tumors. In this study, a stable colon cancer CT26 cell line, CT26-CD19-FLUC-GFP, expressing CD19, firefly luciferase (FLUC), and green fluorescent protein (GFP), was constructed using a triple-plasmid lentiviral system. The growth characteristics of this cell line were consistent with those of the CT26 cell line. Subsequent flow cytometry analysis confirmed stable expression of CD19 and GFP in CT26-CD19-FLUC-GFP cells after serial passaging up to the 5th, 10th, and 22nd generations. Further validation revealed significantly higher levels of CD19 mRNA and FLUC expression in CT26-CD19-FLUC-GFP cells continuously passaged up to the 22nd generation compared to the control CT26 cells. In comparison to T cells, CD19 CAR-T cells demonstrated substantial cytotoxicity against CT26-CD19-FLUC-GFP cells and MC38-CD19 cells. One week after intraperitoneal implantation of CT26-CD19-FLUC-GFP cells into mice, FLUC expression in the peritoneal region could be detected. These results indicate the successful establishment of a stable CT26 cell line expressing CD19-FLUC-GFP, which can be specifically targeted by CD19 CAR-T cells.
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