首都医科大学学报 ›› 2005, Vol. 26 ›› Issue (6): 652-654.

• 专题报道 • 上一篇    下一篇

不同价态锰对神经细胞的毒性比较以及硒的保护作用

陈丽1, 吴萍1, 张杰1, 李洁2, 宣登峰1, 褚金花1, 赵峰1, 李国君1   

  1. 1. 首都医科大学公共卫生与家庭医学学院劳动卫生与环境卫生教研室;2. 北京市丰台区疾病预防与控制中心
  • 收稿日期:2005-11-08 修回日期:1900-01-01 出版日期:2005-12-24 发布日期:2005-12-24

Neural Toxicity Induced by Divalent and Tetravalent Forms of Manganese and its Protection by Selenium

Chen Li1, Wu Ping1, Zhang Jie1, Li Jie2, Xuan Dengfeng1, Chu Jinhua1, Zhao Feng1, Li Guojun1   

  1. 1. Department of Occupational and Environmental Health, School of Public Health and Family Medicine, CapitalUniversity of Medical Sciences;2. Fengtai District of Beijing Centers for Disease Prevention and Control
  • Received:2005-11-08 Revised:1900-01-01 Online:2005-12-24 Published:2005-12-24

摘要: 目的 研究不同价态锰化合物对神经母细胞瘤细胞(SH-SY5Y)DNA损伤作用、细胞凋亡和细胞周期的影响,以及抗氧化剂硒的保护作用,从而探讨锰的神经毒作用机制。方法 将培养的SH-SY5Y细胞随机分为染毒的二价锰和三价锰化合物(0.5mmol/L)组、空白对照组、硒干预组。培养24h后应用单细胞凝胶电泳检测细胞DNA链断裂情况。48h后用流式细胞仪测定细胞凋亡率、细胞周期分布。结果 三价锰组DNA损伤程度比二价锰组严重。二价锰和三价锰组均出现亚二倍体的凋亡峰;细胞周期分布也发生改变,与对照组相比S期细胞明显增多,差异有统计学意义(P<0.01);三价锰比二价锰更易引起细胞凋亡(P<0.01)和细胞周期变化(P<0.05)。硒可降低锰化合物引起的细胞DNA损伤、凋亡率和细胞周期中S期细胞数。结论 不同价态锰对神经细胞均有损伤作用,且三价锰大于二价锰。硒对锰致细胞DNA损伤、凋亡和细胞周期改变有一定的保护作用,提示氧化应激可能参与了锰的毒作用。

关键词: 锰, 神经毒性, 硒, 氧化应激

Abstract: Objective The neural toxicity induced by manganese with different valence was compared, and the protective effects of selenium was investigated.Methods The SH-SY5Ycells were divided into the following groups: control;Mn2+;Mn3+;Selenium;Mn2++Selenium;Mn3++Selenium.The degree of DNAstrand break was determined using a Single Cell Gel Electrophoresis method.Cell apoptosis and cell cycle distribution were determined by flow cytometry.Results Mn3+ induced more DNAstrand break, apoptosis and Sphase accumulation than Mn2+.The neural toxicity induced by either Mn3+ or Mn2+ was reduced by selenium.Conclusion Mn3+ exhibits stronger neural toxicity than Mn2+.Selenium may be a potential agent to protect neurons from Mn-induced damage.

Key words: manganese, neurotoxicity, selenium, oxidative stress

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