中国神经再生研究(英文版) ›› 2023, Vol. 18 ›› Issue (1): 150-154.doi: 10.4103/1673-5374.343883

• 原著:退行性病与再生 • 上一篇    下一篇

Kif5α在肌萎缩侧索硬化神经元突起中的表达和分布失调

  

  • 出版日期:2023-01-15 发布日期:2022-06-17
  • 基金资助:

    研究获FoRUM - F976-20(波鸿鲁尔大学)支持

Dysregulated expression and distribution of Kif5α in neurites of wobbler motor neurons

Kilian Kürten, Anne-Christin Gude, Aimo Samuel Christian Epplen, Jan Stein, Carsten Theiss, Veronika Matschke*   

  1. Department of Cytology, Institute of Anatomy, Medical Faculty, Ruhr University Bochum, Bochum, Germany
  • Online:2023-01-15 Published:2022-06-17
  • Contact: Veronika Matschke, Dr. rer. nat., Veronika.Matschke@rub.de.
  • Supported by:
    This work was supported by FoRUM – F976-20 (Ruhr-University Bochum) (to VM and CT).

摘要:

由于肌萎缩侧索硬化患者和动物模型的轴突运输受到影响,这些突起对于理解运输蛋白在肌萎缩性脊髓侧索硬化的病理机制中的作用至关重要。Kinesin-family-member 5 (Kif5)是重链驱动蛋白家族的一个神经元特异性异构体,其可在人类和动物模型出现神经系统疾病时被检测到,包括肌萎缩侧索硬化。实验通过对肌萎缩侧索硬化模型wobbler鼠颈段脊髓Kif5α mRNA的测序、定量PCRWestern blot,结合脊髓腹角离体培养物的免疫荧光染色,检测了Kif5的表达。同时通过共聚焦成像技术观察了Kif5和线粒体沿运动神经元分支的分布。结果显示在wobbler小鼠中的Kif5表达明显失调,导致Kif5α沿运动神经元分支的分布改变,线粒体分布异常。实验结果表明,Kif5的失调及其在肌萎缩侧索硬化模型中运动神经元分支的异常转运可能是细胞水平上的肌萎缩侧索硬化发病机制。

https://orcid.org/0000-0001-9717-4485 (Veronika Matschke)

Abstract: Impaired axonal transport has been observed in patients with amyotrophic lateral sclerosis (ALS) and in animal models, suggesting that transport proteins likely play a critical role in the pathological mechanism of ALS. Dysregulation of Kinesin-family-member 5α (Kif5α), a neuron-specific isoform of heavy chain kinesin family, has been described in several neurological disorders, in humans and animal models, including ALS. In this study, we determined Kif5α expression by gene sequencing, quantitative reverse transcription-polymerase chain reaction, and western blot assay in the cervical spinal cord of wobbler mice and immunofluorescence staining in dissociated cultures of the ventral horn. Further, we observed the distribution of Kif5α and mitochondria along motor neuronal branches by confocal imaging. Our results showed that Kif5α expression was greatly dysregulated in wobbler mice, which resulted in altered distribution of Kif5α along motor neuronal branches with an abnormal mitochondrial distribution. Thus, our results indicate that dysregulation of Kif5 and therefore abnormal transport in motor neuronal branches in this ALS model could be causative for several pathological findings at the cellular level, like misallocation of cytoskeletal proteins or organelles like mitochondria.

Key words: amyotrophic lateral sclerosis, cell culture, kinesin, mitochondria, neurodegeneration, spinal cord, transport