Down-regulation of Bcl-XL by RNA interference suppresses cell growth and induces apoptosis in human esophageal cancer cells

Figure 4 Effect of siRNA-expressing vector targeting Bcl-X_L on apoptosis of esophageal cancer cells. A: Photographs of YO-PRO-1 staining under the inverted fluorescence microscope at 72 h after transfection. 1: Untreated esophageal cancer cells; 2: Esophageal cancer cells were transfected with empty pTZ-U6＋1 vector; 3: Esophageal cancer cells were transfected with control siRNA-expressing vector; 4: Esophageal cancer cells were transfected with siRNA-expressing vector No.1. B: Percentage of apoptotic cells in every 200 cells (mean ± SD, n = 3, ^aP < 0.05 vs untreated cells).