Abstract
Background
Natural killer (NK) cell-based immunotherapy is a promising treatment approach for multiple myeloma (MM), but obtaining a sufficient number of activated NK cells remains challenging. Here, we report an improved method to generate ex vivo expanded NK (eNK) cells from MM patients based on genetic engineering of K562 cells to express OX40 ligand and membrane-bound (mb) IL-18 and IL-21.
Methods
K562-OX40L-mbIL-18/-21 cells were generated by transducing K562-OX40L cells with a lentiviral vector encoding mbIL-18 and mbIL-21, and these were used as feeder cells to expand NK cells from peripheral blood mononuclear cells of healthy donors (HDs) and MM patients in the presence of IL-2/IL-15. Purity, expansion rate, receptor expression, and functions of eNK cells were determined over four weeks of culture.
Results
NK cell expansion was enhanced by short exposure of soluble IL-18 and IL-21 with K562-OX40L cells. Co-culture of NK cells with K562-OX40L-mbIL-18/-21 cells resulted in remarkable expansion of NK cells from HDs (9,860-fold) and MM patients (4,929-fold) over the 28-day culture period. Moreover, eNK cells showed increased expression of major activation markers and enhanced cytotoxicity towards target K562, U266, and RPMI8226 cells.
Conclusions
Our data suggest that genetically engineered K562 cells expressing OX40L, mbIL-18, and mbIL-21 improve the expansion of NK cells, increase activation signals, and enhance their cytolytic activity towards MM cells.
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Funding
This study was supported by grants from the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (2018R1A2B6006200, 2020R1A2C2010098).
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JL Thangaraj, SH Kweon, M-T Phan, MC Vo, and TH Chu performed the research and analyzed data; J Kim, I Hwang, JH Park, J Doh and SH Lee analyzed data; JH Kim, SH Kim, and JM Lee generated genetically engineered K562-OX40L-mb18/-21 cells; JS Doh, D Cho, and JJ Lee designed the research study and JL Thangaraj, SH Kweon, M-T Phan JH Park, JS Doh, GY Song, SY Ahn, SH Jung, HJ Kim, D Cho, and JJ Lee co-wrote the paper.
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Thangaraj, J.L., Phan, MT.T., Kweon, S. et al. Expansion of cytotoxic natural killer cells in multiple myeloma patients using K562 cells expressing OX40 ligand and membrane-bound IL-18 and IL-21. Cancer Immunol Immunother 71, 613–625 (2022). https://doi.org/10.1007/s00262-021-02982-9
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DOI: https://doi.org/10.1007/s00262-021-02982-9