河北医科大学学报

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黄芩素通过抑制mTOR通路激活自噬促进神经细胞过量表达的alpha突触核蛋白清除

  

  1. 1.广东省深圳市南山区人民医院临床药学室,广东 深圳 518052;2.广东省深圳市南山区人民医院神经内科,广东 深圳 518052;3.广东省深圳市南山区人民医院药剂科中药房,广东 深圳 518052
  • 出版日期:2017-05-25 发布日期:2017-05-23
  • 作者简介:谢利霞(1977-),女,山西大同人,广东省深圳市南山区人民医院副主任药师,药理学博士,从事临床药学、医院药学、药理学研究。
  • 基金资助:
    广东省中医药局建设中医药强省科研课题(20141250);深圳市南山区卫生科技立项(医疗卫生类)(2013026)

Baicalein activates autophagy induced by mTOR pathway and degrades the overexpression of alphasynuclein#br#

  1. 1.Department of Clinical Pharmacy, Shenzhen Nanshan People′s Hospital, Guangdong Province,
    Shenzhen 518052, China; 2.Department of Neurology, Shenzhen Nanshan People′s Hospital,
    Guangdong Province, Shenzhen 518052, China; 3.Department of TCM pharmacy,
    Shenzhen Nanshan People′s Hospital,Guangdong Province,Shenzhen 518052,China
  • Online:2017-05-25 Published:2017-05-23

摘要: [摘要]〓
〖HTH〗目的〖HTSS〗〖KG*2〗探讨黄芩素对神经细胞自噬的激活作用及其机制,以及对帕金森病病理性蛋白alpha突触核蛋白(αsynuclein,αsyn)的清除效果。并观察黄芩素对αsyn诱导线粒体损伤的保护作用。
〖HTH〗方法〖HTSS〗〖KG*2〗通过在PC12神经细胞中过表达αsyn建立帕金森病细胞模型。经不同浓度的黄芩素处理后,观察αsyn的降解情况,并检测细胞自噬的激活情况。检测细胞乳酸脱氢酶的释放情况,观察黄芩素对神经细胞的保护作用。
〖HTH〗结果〖HTSS〗〖KG*2〗黄芩素处理可以剂量依赖地降低αsyn的表达水平,同时激活细胞自噬标志蛋白LC3以及降低自噬底物p62的水平。免疫荧光显示黄芩素促进了自噬小体的形成。黄芩素能够抑制哺乳动物雷帕霉素靶蛋白(mamamalian target of rapamycin,mTOR)的活性。黄芩素降低了αsyn过表达引起的神经细胞毒性,主要表现为降低了细胞乳酸脱氢酶的释放。
〖HTH〗结论〖HTSS〗〖KG*2〗黄芩素通过抑制mTOR通路激活自噬促进神经细胞过量聚集的αsyn清除。

关键词: 帕金森病, 黄芩素, 自噬

Abstract: [Abstract]  Objective〖HTSS〗〓To investigate the effects and mechanisms of Baicalein on autophage activation and the removal of abnormal alphasynuclein aggragation in Parkinson disease. And to observe the protective effect of baicalein on mitochondrial damage induced by alphasynuclein.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓The overexpression of alphasynuclein model was established in PC12 cells. Then the cells were treated by different concentrations of Baicalein. The degradation of alphasynuclein was detected by confocal laser scanning microscopy. Finally, the cell lactate dehydrogenase release was examined by use of LDH kit.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓Baicalein can dosedependently reduce the expression level of alphasynuclein, activate autophagy markers LC3 and decrease the level of autophagy substrate p62. Immunofluorescence and western blotting show that Baicalein can inhibit mamamalian target of rapamycin(mTOR)〖KG*4〗to promote the formation of autophagosome. In addition, the Baicalein can decrease alphasynuclein overexpression of nerve cell toxicity by reducing the release of cell lactate dehydrogenase.
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓Autophagy activation induced by mTOR signal transduction pathway can lead to the removal of abnormal aggregation alphasynuclein in neurons.

Key words: Parkinson disease, Baicalein, autophagy