大花红天素对脑微血管内皮细胞凋亡的双相调节作用及机制(英文)

目的：研究中药红景天的有效成分-大花红天素对小鼠脑微血管内皮细胞凋亡的作用及机制。 方法： 观察不同剂量的大花红天素(25 mg/L, 100 mg/L)对体外培养的小鼠脑微血管内皮细胞(bEnd.3株)凋亡的影响。细胞凋亡分别用流式细胞术、免疫细胞化学ABC法(Fas/Bcl-2)及Western blotting(caspase-3)测定。 结果： 与对照组比，在bEnd.3细胞中含药浓度25 mg/L组凋亡明显抑制(P<0.05)，而100 mg/L组凋亡明显加剧(P<0.05)。凋亡抑制组Fas免疫细胞化学染色比对照组弱，阳性细胞明显减少(P<0.05)；而Bcl-2染色比对照组强，阳性细胞明显增加(P<0.05)，caspase-3表达明显抑制(P<0.05)。凋亡加剧组中(100 mg/L)变化相反。 结论： 大花红天素对bEnd.3细胞凋亡有双相调节作用，其机制与Fas/Bcl-2蛋白表达及caspase-3激活的变化有关。

Dual-direction effect of crenulatin on apoptosis of cerebral microvascular endothelial cells and it's mechanism

] AIM: To study the effect and the mechanism of crenulatin, an effective constituent of Chinese traditional medicine, on apoptosis of cerebral microvascular endothelial cells. METHODS: The following terminal concentrations of crenulatin were used in the study: 25 mg/L and 100 mg/L. Apoptosis of mouse cerebral microvascular endothelial cells (bEnd.3 cell line) was evaluated by flow cytometer, immunocytochemical assay (Fas, Bcl-2) and Western blotting (caspase-3) after culture for 24 h. RESULTS: Compared with control group, apoptosis of bEnd.3 cells in 25 mg/L group was significantly inhibited (P<0.05), but apoptosis in the 100 mg/L group was significantly increased (P<0.05). In apoptosis inhibited group, the Fas immunocytochemical staining was weaker, the positive cells were significantly decreased (P<0.05) and caspase-3 expression was decreased compared with control group; however, the Bcl-2 staining was stronger and the positive cells were significantly increased (P<0.05). On the other hand, in apoptosis increased group (100 mg/L group), the changes were just opposite. CONCLUSIONS: The effect of crenulatin on apoptosis of mouse cerebral microvascular endothelial cells possesses a dual-direction change, inhibitive effect in 25 mg/L and stimulative effect in 100 mg/L group, respectively. The mechanism is related to the alterations of Fas/Bcl-2 expression and caspase-3 activity.