Fig. 2

Effect of oridonin on HUVEC apoptosis. HUVECs were treated with various concentrations (39–2500 μg/ml) of oridonin, and apoptosis was determined by FAC assay for 24 h. a control group; b 39 μg/ml oridonin group; c 156 μg/ml oridonin group; d 625 μg/ml oridonin group; e 2500 μg/ml oridonin group; f HUVEC apoptosis for Q2 and Q4 comparison. The asterisks indicate statistically significant differences for oridonin groups compared with the control group (*P < 0.05, **P < 0.01, ***P < 0.001)