首都医科大学学报 ›› 2016, Vol. 37 ›› Issue (6): 806-811.doi: 10.3969/j.issn.1006-7795.2016.06.017

• 基础研究 • 上一篇    下一篇

原子力显微镜检测α-突触核蛋白转基因鼠线粒体微观结构的变化

高歌, 汪志鹏, 段春礼, 鲁玲玲, 杨慧   

  1. 首都医科大学神经生物系 北京脑重大疾病研究院帕金森病研究所 北京市神经再生修复重点实验室 神经变性病教育部重点实验室, 北京 100069
  • 收稿日期:2016-06-22 出版日期:2016-12-21 发布日期:2016-12-16
  • 通讯作者: 杨慧 E-mail:huiyang@ccmu.edu.cn
  • 基金资助:
    国家自然科学基金(81371398),北京市自然科学基金(7131001),北京市创新团队建设提升计划(IDHT20140514),首都医科大学校基金(2015JS21),北京脑重大疾病研究院项目(BIBD-PXM2013 014226 07 000084)

Topographic images analysis of mitochondria from α-synuclein transgenic mice utilizing atomic force microscopy

Gao Ge, Wang Zhipeng, Duan Chunli, Lu Lingling, Yang Hui   

  1. Department of Neurobiology, Capital Medical University, Center for Parkinson's Disease, Beijing Institute for Brain Disorders, Beijing Center of Neural Degeneration and Repairing, Key Laboratory for Neurodegenerative Diseases, Ministry of Education, Beijing 100069, China
  • Received:2016-06-22 Online:2016-12-21 Published:2016-12-16
  • Supported by:
    This study was supported by National Natural Science Foundation of China (81371398), Natural Science Foundation of Beijing (7131001),Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (IDHT20140514),Principal Fund of Capital Medical University(2015JS21),Beijing Institute for Brain Disorder-PXM(BIBD-PXM2013 014226 07 000084).

摘要: 目的 使用原子力显微镜检测α-突触核蛋白(α-synuclein,α-syn)转基因小鼠模型中,皮质线粒体表面微观结构的变化。方法 提取野生型和转基因小鼠皮质细胞线粒体,使用共聚焦显微镜检测其膜电势变化,使用原子力显微镜的敲击模式检测线粒体膜表面的微观结构。结果 JC-1染色法检测线粒体膜电势结果显示,转基因小鼠线粒体膜电势与野生组相比降低20.4%,差异有统计学意义(P<0.01);原子力显微镜观察结果显示,转基因小鼠线粒体长度与野生组相比增加,表面光滑度减低,线粒体膜孔增多(P<0.05)。结论 α-Syn的转基因小鼠线粒体膜电势减低,线粒体膜完整性受到破坏。在原子力显微镜敲击模式下检测离体线粒体,能反映出转基因小鼠线粒体膜表面微观结构的变化。

关键词: 原子力显微镜, 线粒体, α-突触核蛋白, 线粒体膜电势

Abstract: Objective To investigate the mitochondrial topographic images and nanostructural changes in isolated cortex mitochondria from mice overexpressing human wild-type α-synuclein (Thy1-α-synuclein mice, Tg/α-syn) via atomic force microscopy (AFM). Methods Via JC-1 staining to exam the mitochondrial membrane potential of mitochondria isolated from wild type mice(WT) and transgenic mice(TG). The topographic images and nanostructural changes of mitochondria were detected by AFM between the two groups. Results The mitochondrial membrane potential of mitochondria isolated from transgenic mice was decreased by 20.4% compared with the wild type mice (P<0.01). And the topographic images and nanostructure results showed that the length, roughness and number of pore-like structure were increased in mitochondria isolated from TG group (P<0.05). Conclusion Overexpressing α-syn could attenuate mitochondrial membrane potential (Δψm) and the mitochondrial membrane was destroyed. The AFM could show the topographic images and nanostructural changes in the isolated mitochondria using tapping mode.

Key words: atomic force microscopy (AFM), mitochondria, α-synuclein (α-syn), mitochondrial membrane potential(Δψm)

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