The human erthryomyeloblastoid leukemia (K562) cell line was used to optimize protein extraction protocols prior to application in primary NK cells. K562 cells were cultured in Roswell Park Memorial Institute Medium (RPMI)-1640 (Invitrogen Life Technologies, Carlsbad, CA, United States) supplemented with 10% fetal bovine serum (FBS) (Invitrogen Life Technologies, Carlsbad, CA, United States) under physiological conditions in 5% CO2 at 37°C. Cultured K562 cells in exponential phase were prepared at 2.0 × 106 and 5.0 × 106 cells per sample in duplicates.
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