黄芪甲苷改善1-甲基-4-苯基吡啶离子诱导的帕金森病SK-N-SH细胞损伤疗效初探

目的探讨黄芪甲苷对1-甲基-4-苯基吡啶离子(MPP+)诱导的帕金森病SK-N-SH细胞损伤的作用机制。方法人神经母细胞瘤细胞系SK-N-SH培养至对数生长期,随机予以常规培养(对照组)、MPP+诱导(MPP+组)、黄芪甲苷10 mg/ml+MPP+诱导(黄芪甲苷10 mg/ml组)、黄芪甲苷30 mg/ml+MPP+诱导(黄芪甲苷30 mg/ml组)、黄芪甲苷30 mg/ml+MPP+诱导+Janus激酶2(JAK2)抑制剂AG490(JAK2抑制剂组),噻唑蓝法检测细胞存活率,流式细胞术检测细胞凋亡率,DCFH-DA荧光探针测定活性氧(ROS)含量,酶法测定乳酸脱氢酶(LDH)和超氧化物歧化酶(SOD)活性,Western blotting法测定磷酸化JAK2(pJAK2)和磷酸化信号转导与转录激活因子3(pSTAT3)蛋白相对表达量。结果不同处理组SK-N-SH细胞存活率(P=0.000)、凋亡率(P=0.000)、ROS含量(P=0.000)、LDH活性(P=0.000)、SOD活性(P=0.003)、pJAK2(P=0.000)和pSTAT3(P=0.000)蛋白相对表达量差异有统计学意义。与对照组相比,MPP+组、黄芪甲苷10 mg/ml组和30 mg/ml组、JAK2抑制剂组细胞存活率(P=0.000,0.001,0.049,0.000)和SOD活性(P=0.000,0.002,0.012,0.000)、pJAK2(P=0.003,0.006,0.036,0.002)和pSTAT3(P=0.001,0.002,0.024,0.001)蛋白相对表达量降低,细胞凋亡率(P=0.001,0.001,0.001,0.000)、ROS含量(P=0.000,0.001,0.002,0.000)和LDH活性(P=0.000,0.002,0.038,0.000)升高;与MPP+组相比,黄芪甲苷10 mg/ml组和30 mg/ml组细胞存活率(P=0.016,0.000)和SOD活性(P=0.003,0.001)、pJAK2(P=0.013,0.002)和pSTAT3(P=0.018,0.002)蛋白相对表达量升高,细胞凋亡率(P=0.021,0.008)、ROS含量(P=0.031,0.003)和LDH活性(P=0.001,0.000)降低;与黄芪甲苷10 mg/ml组相比,黄芪甲苷30 mg/ml组细胞存活率(P=0.002)和SOD活性(P=0.027)、pJAK2(P=0.007)和pSTAT3(P=0.006)蛋白相对表达量升高,ROS含量(P=0.019)和LDH活性(P=0.011)降低,JAK2抑制剂组细胞凋亡率(P=0.016)、ROS含量(P=0.030)和LDH活性(P=0.004)升高,SOD活性(P=0.004)、pJAK2(P=0.001)和pSTAT3(P=0.005)蛋白相对表达量降低;与黄芪甲苷30 mg/ml组相比,JAK2抑制剂组细胞存活率(P=0.001)、SOD活性(P=0.001)、pJAK2(P=0.000)和pSTAT3(P=0.001)蛋白相对表达量降低,凋亡率(P=0.004)、ROS含量(P=0.002)和LDH活性(P=0.001)升高。结论黄芪甲苷可以减轻MPP+诱导的帕金森病SK-N-SH细胞损伤,其机制可能与激活JAK2-STAT3信号转导通路有关。

快走丝线切割机床的断丝问题

从电极丝的选择、安装、使用和高频电参数选择等方面出发,阐述了快走丝电火花线切割机床中造成电极丝断丝的原因及解决办法。