中国神经再生研究(英文版) ›› 2015, Vol. 10 ›› Issue (9): 1441-1449.doi: 10.4103/1673-5374.165512

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

法舒地尔对慢性脑缺血的神经保护

  

  • 收稿日期:2015-06-02 出版日期:2015-09-28 发布日期:2015-09-28
  • 基金资助:

    吉林省自然科学基金

The role of Rho/Rho-kinase pathway and the neuroprotective effects of fasudil in chronic cerebral ischemia

Ya-yun Yan, Xiao-ming Wang, Yan Jiang, Han Chen, Jin-ting He, Jing Mang, Yan-kun Shao*, Zhong-xin Xu*   

  1. Department of Neurology, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China
  • Received:2015-06-02 Online:2015-09-28 Published:2015-09-28
  • Contact: Yan-kun Shao, M.D. or Zhong-xin Xu, M.D., yankunshao@163.com or zhongxinxu@163.com.
  • Supported by:

    This study was supported by the Natural Science Foundation of Jilin Province of China, No. 200705272, 20140414028GH

摘要:

Rho/Rho激酶信号通路在脑缺血再灌注损伤发病中有重要作用。以往相关研究主要集中于该信号通路对急性脑缺血的影响,但对慢性脑缺血的影响的报道则几乎未见。实验应用双侧颈总动脉阻塞的方法建立慢性脑缺血大鼠模型后,灌胃Rho激酶抑制剂法舒地尔干预9周。Morris水迷宫试验结果表明,脑缺血大鼠认知功能随时间推移逐渐变差。免疫组化、RT-PCR和免疫印迹结果表明,大鼠大脑皮质Rho激酶、Rho激酶底物肌球蛋白结合亚基及其相关蛋白α平滑肌肌动蛋白表达在慢性脑缺血后明显增加。TUNEL染色表明,慢性脑缺血大鼠大脑皮质细胞凋亡数量和凋亡调节基因Caspase-3表达明显增加。法舒地尔明显减轻慢性脑缺血大鼠认知功能障碍,降低Rho激酶、Rho激酶底物肌球蛋白结合亚基及其相关蛋白α平滑肌肌动蛋白表达,还可以降低脑缺血大鼠大脑皮质Caspase-3表达,减少细胞凋亡。说明法舒地尔可以通过抑制Rho/Rho激酶信号通路、减少脑细胞凋亡,减轻慢性脑缺血导致的认知功能缺损,起到神经保护作用。

关键词: 神经再生, 慢性脑缺血, 法舒地尔, Rho激酶, α平滑肌肌动蛋白, 肌球蛋白结合亚基, 认知障碍, Caspase-3, 凋亡

Abstract:

The Rho/Rho-kinase signaling pathway plays an important role in cerebral ischemia/reperfusion injury. However, very few studies have examined in detail the changes in the Rho/Rho-kinase signaling pathway in chronic cerebral ischemia. In this study, rat models of chronic cerebral ischemia were established by permanent bilateral common carotid artery occlusion and intragastrically administered 9 mg/kg fasudil, a powerful ROCK inhibitor, for 9 weeks. Morris water maze results showed that cognitive impairment progressively worsened as the cerebral ischemia proceeded. Immunohistochemistry, semi-quantitative RT-PCR and western blot analysis showed that the expression levels of Rho-kinase, its substrate myosin-binding subunit, and its related protein alpha smooth muscle actin, significantly increased after chronic cerebral ischemia. TUNEL staining showed that chronic cerebral ischemia could lead to an increase in neuronal apoptosis, as well as the expression level of caspase-3 in the frontal cortex of rats subjected to chronic cerebral ischemia. Fasudil treatment alleviated the cognitive impairment in rats with chronic cerebral ischemia, and decreased the expression level of Rho-kinase, myosin-binding subunit and alpha smooth muscle actin. Furthermore, fasudil could regulate cerebral injury by reducing cell apoptosis and decreasing caspase-3 expression in the frontal cortex. These findings demonstrate that fasudil can protect against cognitive impairment induced by chronic cerebral ischemia via the Rho/Rho-kinase signaling pathway and anti-apoptosis mechanism.

Key words: nerve regeneration, chronic cerebral ischemia, fasudil, Rho-kinase, alpha smooth muscle actin, myosin-binding subunit, cognitive impairment, caspase-3, apoptosis, neural regeneration