Abstract
Natural killer (NK) cells hold promise for cancer therapy. NK cytotoxicity can be enhanced by expression of chimeric antigen receptors that re-direct specificity toward target cells by engaging cell surface molecules expressed on target cells. We developed a regulatory-compliant, scalable non-viral approach to engineer NK cells to be target-specific based on transfection of mRNA encoding chimeric receptors. Transfection of eGFP mRNA into ex vivo expanded NK cells (N=5) or purified unstimulated NK cells from peripheral blood (N=4) resulted in good cell viability with eGFP expression in 85±6% and 86±4%, 24 h after transfection, respectively. An mRNA encoding a receptor directed against CD19 (anti-CD19-BB-z) was also transfected into NK cells efficiently. Ex vivo expanded and purified unstimulated NK cells expressing anti-CD19-BB-z exhibited enhanced cytotoxicity against CD19+ target cells resulting in ⩾80% lysis of acute lymphoblastic leukemia and B-lineage chronic lymphocytic leukemia cells at effector target ratios lower than 10:1. The target-specific cytotoxicity for anti-CD19-BB-z mRNA-transfected NK cells was observed as early as 3 h after transfection and persisted for up to 3 days. The method described here should facilitate the clinical development of NK-based antigen-targeted immunotherapy for cancer.
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Acknowledgements
We express their gratitude to Dr Gary Moroff and Ms Amy Neuschaferand at American Red Cross Holland Lab (15601 Crabbs Branch Way, Rockville, MD) for training and usage of a Gammacell 1000 irradiator.
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Li, L., Liu, L., Feller, S. et al. Expression of chimeric antigen receptors in natural killer cells with a regulatory-compliant non-viral method. Cancer Gene Ther 17, 147–154 (2010). https://doi.org/10.1038/cgt.2009.61
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DOI: https://doi.org/10.1038/cgt.2009.61
Keywords
- NK cells
- chimeric antigen receptor
- electroporation
- non-viral
- transfection
- mRNA
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