黄晓静, 黄淮, 徐正虎, 黄万钢, 杨东风, 任贺成
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。