人参皂甙Rb1对香烟烟雾诱导大鼠神经细胞损伤的保护作用

[目的]探讨人参皂甙Rb1(GRb1)对香烟烟雾诱导大鼠神经细胞损伤的保护作用和机制。[方法]制备烟灌注大鼠模型,吸烟量分别为8、20、40支/d,12周后腹腔注射不同剂量的GRb1(10、20、40 mg/kg)。各组大鼠同时制备皮层神经细胞培养液,24 h后应用Annexin V联合流式细胞仪检测细胞凋亡率和坏死率,Western-Blot检测存活素(Survivin)的表达水平,Fura-2/AM负载及荧光标记检测神经细胞内游离Ca2+浓度。[结果]香烟烟雾刺激诱导神经细胞发生凋亡和坏死,与对照组相比凋亡率和坏死率显著增高。与对照组相比,8支/d香烟烟雾刺激使Survivin表达增强34%,20、40支/d香烟烟雾刺激使Survivin表达分别下降48%和67%;20、40 mg/kg的GRb1使细胞凋亡率分别下降30.6%和40.3%,细胞坏死率分别下降32.5%和39.4%,Survivin表达水平上调45.1%和54.8%。香烟烟雾可使神经细胞内游离Ca2+浓度显著升高,GRb1使神经细胞内Ca2+浓度显著下降(P﹤0.01)。[结论]GRb1通过抑制细胞内Ca2+超载,调节Survivin表达,减轻香烟烟雾对神经细胞的损伤。

PROTECTIVE EFFECTS OF GINSENOSIDE RB1 AGAINST RAT NEURONAL INJURY INDUCED BY CIGARETTE SMOKE

[Objective]To investigate the effects of Ginsenoside Rb1(GRb1)on rat neurotoxicity induced by cigarette smoke.[Methods]Male Wister rats were prepared under cigarette smoking for 12 weeks.The amount of cigarettes was 8,20 and 40 per day,respectively.GRb1(10,20 and 40mg/kg)was administered intra-peritoneal to rats after rat smoking for 12 weeks.Cerebral cortex neuronal cells were prepared from these rats in vitro.After 24h of GRb1 treatment,flow cytometric analysis of Annexin V(marks apoptosis)and PI(propidiu...