Figure 2.

Proteasome inhibitor MG132 had similar effects on cell viability in other human esophageal squamous cancer cell lines as well as EC9706 cells. EC9706, EC109, EC1 and TE-1 cells were treated with or without 5 μM MG132 for 24 h. The absorbance (A) obtained from CCK-8 assays is the mean ± standard deviation (SD) for three separate experiments. Absorbance for cells treated with MG132 were significantly reduced compared with that obtained for the control as assessed using the Student’s t-test (^*P<0.05, ^**P<0.01 vs. the control group).