摘 要:本文旨在探讨Macranthoin G(MCG)对过氧化氢(H2O2)诱导的嗜铬细胞瘤细胞(PC12)细胞毒性的保护作用和澄清潜在的保护机制。方法是采用大鼠嗜铬细胞瘤细胞(PC12)为研究对象,以H2O2作为诱导凋亡因素,建立体外模拟自由基损伤诱导细胞凋亡模型,采用MTT比色法分析检测细胞的存活率,用流式细胞术检测PC12细胞凋亡的百分率。结果表明,在进行H2O2处理PC12细胞之前,先将其与MCG反应,可有效的增加细胞活力和线粒体膜电位(MMP);此外,MCG还可增强超氧化物歧化酶(SOD)的抗氧化酶活性、过氧化氢酶(CAT)和谷胱甘肽过氧化物酶(GSH-Px)的活性,同时降低丙二醛(MDA)含量和细胞内活性氧簇(ROS),以及细胞凋亡。这些结果表明,MCG应鼓励作为一个潜在的氧化损伤诱导的神经退行性疾病的治疗剂而进行进一步研究。57417
毕业论文关键字:Macranthoin G,过氧化氢,PC12细胞,抗氧化
Abstract :The present study is aimed to investigate the protective role of Macranthoin G(MCG) Against the cytotoxicity induced by hydrogen peroxide (H2O2) and to elucidate potential protective mechanisms in pheochromocytoma (PC12) cells. The results showed that treatment of PC12 cells with MCG prior to H2O2 exposure effectively increased the cell viability, and stabilized the mitochondria membrane potential (MMP); furthermore, it enhanced the antioxidant enzyme activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px); it also decreased the malondialdehyde (MDA) content, intracellular reactive oxygen species (ROS), as well as cell apoptosis. These results implied that MCG should be encouraged for further research as a potential therapeutic agent for neurodegenerative diseases induced by oxidative damage.
Keywords: macranthoin G, hydrogen peroxide, PC12, antioxidant
目录
1 前言 4
1.1 氧化 4
1.2 氧化剂与抗氧化剂 4
1.3 氧化应激 4
1.4 细胞凋亡模型 5
1.5 自由基清除剂 5
1.5.1 抗坏血酸 5
1.5.2 谷胱甘肽 5
1.5.3 褪黑素 5
2 材料和方法 6
2.1 试剂 6
2.2 仪器 6
2.3 细胞和细胞培养 6
2.4 细胞活力测定 6
2.5 丙二醛(MDA)含量的测定,SOD,GSH-Px活性和CAT分析 7
2.6 ROS和MMP测量 7
2.7 细胞凋亡的检测 8
2.8 数据分析 8
3 结果与讨论 8
3.1 MCG对H2O2诱导PC12细胞存活率的影响 8
3.2 MCG对H2O2诱导PC12细胞MDA含量的影响 9
3.3 MCG对H2O2诱导的PC12细胞产生的抗氧化酶的影响 10
3.4 MCG对H2O2诱导的ROS的产生和对PC12细胞MMP的影响 11
3.5 MCG对H2O2诱导的PC12细胞凋亡的影响 12
结论