For examination of CD8+ T cells proliferation, CD8+ T cells of GC patients were placed in flow tubes and washed once with PBS. PBS (200 µL) was added for flow cytometry detection.
For NF-κB detection, CD8+ T cells from GC patients were treated with 10 µg/ml anti-CD137 mAb (BPS Bioscience, USA) for 72 h and placed in flow tubes. After washing once with PBS, a Fixation/Permeabilization Solution (BD Cytofix/Cytoperm™) was added at room temperature for 30 min. After washing once with PBS, an NF-κB p65 rabbit mAb (1:1000, CST, USA) was added. The cells were incubated in the dark for 1 h and washed once with PBS. Five microliters of anti-rabbit IgG (H+L), F(ab’)2 Fragment (Alexa Fluor® 594 Conjugate) (1:500, CST, USA) was added, and the cells were incubated in the dark for 30 min. After washing once with PBS, 200 µL of PBS was added for flow cytometry detection.