中国神经再生研究(英文版) ›› 2016, Vol. 11 ›› Issue (1): 114-118.doi: 10.4103/1673-5374.175055

• 原著:神经损伤修复保护与再生 • 上一篇    下一篇

在神经元轴突转运过程中相互作用蛋白的新发现

  

  • 收稿日期:2015-10-26 出版日期:2016-01-15 发布日期:2016-01-15
  • 基金资助:

    核能省教育厅重点科技项目(12A350006)

     

Specific effects of c-Jun NH2-terminal kinase-interacting protein 1 in neuronal axons

Shu Tang 1, Qiang Wen 2, Xiao-jian Zhang 1, Quan-cheng Kan 1   

  1. 1 Department of Pharmacy, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, China
    2 Department of Clinical Pharmacology, Basic Medical College, Zhengzhou University, Zhengzhou, Henan Province, China
  • Received:2015-10-26 Online:2016-01-15 Published:2016-01-15
  • Contact: Shu Tang, M.D.,tangshu018@163.com.
  • Supported by:

    This study was supported by the Henan Province Education Department Key Project of Science and Technology Research in China, No. 12A350006.

摘要:

JNK相互作用蛋白3对脑源性神经营养因子受体TrkB顺轴突转运起到重要作用,然而JNK相互作用蛋白1能否介导类似作用,以及JNK相互作用蛋白1在精确调节TrkB顺轴突转运中的作用如何,目前尚未见相关报道。我们分离大鼠胚胎大脑海马组织,体外培养获得海马神经元,免疫共沉淀结果发现JNK相互作用蛋白1可在细胞内外与TrkB形成复合物,免疫细胞化学方法显示在JNK相互作用蛋白1高表达情况下轴突末端TrkB分布显著增多,而敲除JNK相互作用蛋白1后轴突末端TrkB分布显著减少,且敲除与未敲除JNK相互作用蛋白1后TrkB分布存在差异。这种现象在树突内无论敲除与不敲除JNK相互作用蛋白1对TrkB的分布均无影响。说明JNK相互作用蛋白1在神经元细胞内可以与TrkB相互作用而仅调节TrkB在轴突内的转运过程,在树突内无此类作用。

关键词: 神经再生, JNK相互作用蛋白, 神经元, 内脑源性神经营养因子, TrkB, 轴突, 海马组织, 树突, 调节

Abstract:

c-Jun NH2-terminal kinase (JNK)-interacting protein 3 plays an important role in brain-derived neurotrophic factor/tropomyosin-related kinase B (TrkB) anterograde axonal transport. It remains unclear whether JNK-interacting protein 1 mediates similar effects, or whether JNK-interacting protein 1 affects the regulation of TrkB anterograde axonal transport. In this study, we isolated rat embryonic hippocampus and cultured hippocampal neurons in vitro. Coimmunoprecipitation results demonstrated that JNK-interacting protein 1 formed TrkB complexes in vitro and in vivo. Immunocytochemistry results showed that when JNK-interacting protein 1 was highly expressed, the distribution of TrkB gradually increased in axon terminals. However, the distribution of TrkB reduced in axon terminals after knocking out JNK-interacting protein 1. In addition, there were differences in distribution of TrkB after JNK-interacting protein 1 was knocked out compared with not. However, knockout of JNK-interacting protein 1 did not affect the distribution of TrkB in dendrites. These findings confirm that JNK-interacting
protein 1 can interact with TrkB in neuronal cells, and can regulate the transport of TrkB in axons, but not in dendrites.

Key words: nerve regeneration, c-Jun NH2-terminal kinase-interacting protein, neurons, brain-derived neurotrophic factor, tropomyosin-related kinase B, axons, hippocampus, dendrites, regulation, neural regeneration