Figure 4From: Cephalotaxus griffithii Hook.f. needle extract induces cell cycle arrest, apoptosis and suppression of hTERT and hTR expression on human breast cancer cells CGN PE extract treatment causes caspase dependent apoptotic cell death in human breast cancer cells. (A) ZR751 cells were treated with (5 – 40 μg/ml) or without PE extract for up to 24 h. Protein expression of p53, BAX, Bcl2, caspase-3, PARP and cleaved-PARP was determined by western blot. β - actin was used as loading control (B) ZR751 cells were treated with (5 – 40 μg/ml) or without PE extract for up to 24 h prior to caspase-3, caspase-8 and caspase-9 activity assay. Each bar represents the mean ± SD (n = 3). Bars marked without a common letter within each caspase activity are significantly different (P < 0.05) analysed by one-way ANOVA supplemented with Tukey’s HSD test.Back to article page