Fig. 4.

SAHA pretreatment or HDAC knockdown suppressed the expression of p-JAK1, p-JAK2, and p-STAT1. a HGC27 cells were pretreated with either DMSO or GLPG0634 (5 μM), fedratinib (5 μM), fludarabine (100 μM), and NSC 74589 (200 μM) for 8 h to inhibit JAK1, JAK2, STAT1, and STAT3, respectively, followed by treatment of 50 ng/ml IFN-γ for 24 h. Then, B7-H1 protein expression was determined. b HGC27 cells were treated according to the schedule shown in Fig. 2b; then, the expression of the phosphorylated and total protein of JAK1, JAK2, and STAT1 was determined. c Thirty-six hours after the transfection of negative control (NC) or HDAC siRNA, HGC27 cells were treated with 50 ng/ml IFN-γ for 3 h. Then, the expression of the phosphorylated and total protein of JAK1, JAK2, and STAT1 was determined. a–c Experiments were repeated three times with similar results