天然产物研究与开发 ›› 2015, Vol. 27 ›› Issue (2): 338-343.doi: 10.16333/j.1001-6880.2015.02.028

• 开发研究 • 上一篇    下一篇

籽瓜多糖对H2O2致PC12细胞氧化损伤的保护作用

刘琴1,2,3,宋珅1,郭杰1,罗顺3,张继1,2*   

  1. 1 西北师范大学生命科学学院;2 甘肃特色植物有效成分制品工程技术研究中心;3 甘肃万州健顺生物科技有限公司,兰州 730070
  • 出版日期:2015-02-15 发布日期:2015-02-15

Protective Effects of Polysaccharide from Seed Watermelon on the Oxidative Damage of PC12 Cells Induced by H2O2

LIU Qin1,2,3, SONG Shen1, GUO Jie1, LUO Shun3, ZHANG Ji1,2*   

  1. 1 College of Life Science,Northwest Normal University;2 Research Center For Gansu Distinctive Plants,Northwest Normal University;3Jianshun biosciences corporation,Lanzhou 730070,China
  • Online:2015-02-15 Published:2015-02-15

摘要: 本文研究了籽瓜多糖(SWP)对H2O2致PC12细胞氧化应激损伤的影响及其机制。通过建立H2O2诱导PC12细胞氧化损伤模型,CCK-8法测定细胞存活率;硫辛酰胺脱氢酶催化的INT显色反应检测乳酸脱氢酶(LDH)释放量,DCFH-DA检测细胞内ROS;ELISA法检测8-OHdG;JC-1染色检测细胞线粒体膜电位;利用caspase-3可以催化底物Ac-DEVD-pNA的反应检测caspase-3活性;应用caspase-9催化特异性底物Ac-LEHD-pNA检测caspase-9活性。结果显示:过氧化氢组与对照组相比,终浓度为500 μmol/L H2O2作用细胞24 h后,细胞活力显著下降(P<0.01);LDH释放量和细胞内ROS增加(P<0.01);8-OHdG含量上升(P<0.01);线粒体膜电位下降(P<0.01);caspase-3和caspase-9活性增强(P<0.01)。与H2O2损伤组相比,不同剂量的SWP预处理后,能显著改善H2O2引起的上述指标的变化(P<0.05)。由此得出:SWP对H2O2诱导的PC12细胞的氧化损伤具有一定的保护作用。

关键词: 籽瓜多糖, 过氧化氢, 氧化损伤, Caspase, PC12细胞

Abstract: To determine the neuroprotective effects of seed watermelon polysaccharide on PC12 cells injured by H2O2 and the molecular mechanisms underlying these neuroprotective effects.The cell viability was analyzed by CCK-8 assay,the toxicity model was established by treating PC12 cells with H2O2.The releasing rate of LDH was determined by the color reaction of diaphorase INT.ROS production was determined by DCFH-DA fluorescence.8-OHdG production was determined by ELISA.Mitochondria membrane potential was determined by JC-1 staining.Caspase-3 activity was determined by caspase3 catalyze the substrate specificity Ac-DEVD-pNA.Caspase-9 activity was determined by caspase-9 catalyze the substrate specificity Ac-LEHD-pNA.In comparison to control cells,exposure of cells to 500 μmol/L H2O2 for 24 h resulted in approximately 65% cell viability of control (P<0.01). H2O2 induced significantly the increase of LDH release,intracellular ROS and 8-OHdG (P<0.01),and the decrease of mitochondrial membrane potential (P<0.01). H2O2 induced oxidative stress increased caspase-3 and caspase-9 activity (P<0.01).Compared with H2O2 group,different doses of SWP can significantly improve the change of the index H2O2-induced (P<0.05).Polysaccharide from seed watermelon had protective effect on PC12 cells injury induced by H2O2 in culture.

Key words: polysaccharide from seed watermelon, hydrogen peroxide, oxidative damage, caspase, PC12 cells

中图分类号: 

R285