Abstract
Chimeric antigen receptors (CARs), which combine an antibody-derived binding domain (single chain fragment variable) with T-cell-activating signaling domains, have become a promising tool in the adoptive cellular therapy of cancer. Retro- and lenti-viral transductions are currently the standard methods to equip T cells with a CAR; permanent CAR expression, however, harbors several risks like uncontrolled auto-reactivity. Modification of T cells by electroporation with CAR-encoding RNA to achieve transient expression likely circumvents these difficulties. We here present a GMP-compliant protocol to activate and expand T cells for clinical application. The protocol is optimized in particular to produce CAR-modified T cells in clinically sufficient numbers under full GMP-compliance from late-stage cancer patients. This protocol allows the generation of 6.7 × 108 CAR-expressing T cells from one patient leukapheresis. The CAR-engineered T cells produced pro-inflammatory cytokines after stimulation with antigen-bearing tumor cells and lysed tumor cells in an antigen-specific manner. This functional capacity was maintained after cryopreservation. Taken together, we provide a clinically applicable protocol to transiently engineer sufficient numbers of antigen-specific patient T cells for use in adoptive cell therapy of cancer.
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Acknowledgments
We would like to thank Katrin Birkholz, Christian Hofmann, and Stefanie Hoyer for excellent practical advisory and interesting discussions; Verena Wellner, Stefanie Baumann, and Ina Müller for excellent technical assistance; Stefanie Gross for evaluation of flow cytometry data and providing antibodies; Kris Thielemans for providing the pGEM4Z RNA-production vector; Saskia Santegroets and Tanja de Gruijl for providing the KATO III cell line; Miltenyi Biotech for kindly providing the anti-CD28 antibody; Caroline Bosch-Voskens for providing antibodies and donor cells; and Michael Aigner and Özcan Met for fruitful discussion on elutriation-derived T cells. This project was financed by the Wilhelm Sander-Stiftung (2010.001.1) and BayImmuNet (F5121.7.1.1/10/).
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The authors declare no conflict of interest.
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The manuscript does not contain clinical studies or patient data. Human blood was used after informed consent approved by the institutional review board.
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Krug, C., Wiesinger, M., Abken, H. et al. A GMP-compliant protocol to expand and transfect cancer patient T cells with mRNA encoding a tumor-specific chimeric antigen receptor. Cancer Immunol Immunother 63, 999–1008 (2014). https://doi.org/10.1007/s00262-014-1572-5
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DOI: https://doi.org/10.1007/s00262-014-1572-5