中国神经再生研究(英文版) ›› 2014, Vol. 9 ›› Issue (18): 1672-1677.doi: 10.4103/1673-5374.141803

• 原著:脊髓损伤修复保护与再生 • 上一篇    下一篇

氧化磷酸化修饰神经丝蛋白M可保护脊髓缺血再灌注损伤

  

  • 收稿日期:2014-07-25 出版日期:2014-09-26 发布日期:2014-09-26
  • 基金资助:

    国家自然科学基金(81350013/30872609)  

Oxidative phosphorylated neurofilament protein M protects spinal cord against ischemia/reperfusion injury

Haitao Wang 1, Su Pan 2, Xiaoyu Yang 2, Benqing Zhu 3, Dalin Wang 1   

  1. 1 Department of Orthopedic Surgery, Affiliated Hospital of Beihua University, Jilin, Jilin Province, China
    2 Department of Orthopedics, the Second Hospital of Jilin University, Changchun, Jilin Province, China
    3 Department of Orthopedics, People’s Hospital of Tianjin, Tianjin, China
  • Received:2014-07-25 Online:2014-09-26 Published:2014-09-26
  • Contact: Xiaoyu Yang, M.D., Department of Orthopedics, the Second Hospital of Jilin University, Changchun 130000, Jilin Province, China, yangxiaoyu88@sina.com. Dalin Wang, Department of Orthopedic Surgery, Affiliated Hospital of Beihua University, Jilin, Jilin Province, China, 63193778@163.com.
  • Supported by:

    This study was financially supported by the National Natural Science Foundation of China, No. 81350013, 30872609.

摘要:

作者既往研究显示早期脊髓缺血再灌注损伤组织中神经丝蛋白M呈上调表达,说明其可能参与了脊髓缺血再灌注损伤过程。实验应用蛋白组学的双向凝胶电泳与质谱鉴定方法,分析比较兔脊髓缺血25 min再灌注0,12,24,48h与假手术兔脊髓组织中的蛋白表达差异,并对其中与神经修复相关的上调表达蛋白神经丝蛋白M进行免疫组化和免疫印迹研究分析。双向凝胶电泳与质谱鉴定结果显示,与假手术组相比,缺血25min再灌注24h兔脊髓组织中蛋白上调表达的最为显著。免疫组化分析发现在各损伤时间点脊髓组织中神经丝蛋白M分别定位于神经元轴突及细胞浆中;Western blot验证神经丝蛋白M蛋白表达随脊髓再灌注时限的延长具有依从性递增,在再灌注24h达到峰值,后逐渐回归至脊髓再灌注初始水平,且发现神经丝蛋白M可能发生了氧化磷酸化修钸,其磷酸化蛋白与未磷酸化神经丝蛋白M蛋白表达量变化呈平行关系。提示神经丝蛋白M蛋白在脊髓缺血再灌注损伤过程中发挥了重要作用,其功能的行使是通过其蛋白氧化磷酸化修饰来实现。

关键词: 神经再生, 神经丝蛋白M, 脊髓损伤, 缺血再灌注, 蛋白质组学, 磷酸化修饰, 神经保护

Abstract:

Previous studies have shown that neurofilament protein M expression is upregulated in the early stage of spinal cord ischemia/reperfusion injury, indicating that this protein may play a role in the injury process. In the present study, we compared protein expression in spinal cord tissue of rabbits after 25 minutes of ischemia followed by 0, 12, 24, or 48 hours of reperfusion with that of sham operated rabbits, using proteomic two-dimensional gel electrophoresis and mass spectrometry. In addition, the nerve repair-related neurofilament protein M with the unregulated expression was detected with immunohistochemistry and western blot analysis. Two-dimensional gel electrophoresis and mass spectrometry showed that, compared with the sham group, upregulation of protein expression was most significant in the spinal cords of rabbits that had undergone ischemia and 24 hours of reperfusion. Immunohistochemical analysis revealed that neurofilament protein M was located in the membrane and cytoplasm of neuronal soma and axons at each time point after injury. Western blot analysis showed that neurofilament protein M expression increased with reperfusion time until it peaked at 24 hours and returned to baseline level after 48 hours. Furthermore, neurofilament protein M is phosphorylated under oxidative stress, and expression changes were parallel for the phosphorylated and non-phosphorylated forms. Neurofilament protein M plays an important role in spinal cord ischemia/reperfusion injury, and its functions are achieved through oxidative phosphorylation.

Key words: nerve regeneration, neurofilament protein M, spinal cord injury, ischemia/reperfusion, proteomics, phosphorylation, neuroprotection, NSFC grant, neural regeneration