中国神经再生研究(英文版) ›› 2018, Vol. 13 ›› Issue (4): 684-691.doi: 10.4103/1673-5374.230295

• 原著:脊髓损伤修复保护与再生 • 上一篇    下一篇

清除巨噬细胞联合许旺细胞移植减小脊髓挫伤后囊肿的体积

  

  • 收稿日期:2018-03-22 出版日期:2018-04-15 发布日期:2018-04-15

Macrophage depletion and Schwann cell transplantation reduce cyst size after rat contusive spinal cord injury

Yee-Shuan Lee1, Lucy H. Funk1, Jae K. Lee1, 2, Mary Bartlett Bunge1, 2, 3   

  1. 1 The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
    2 Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
    3 Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, USA
  • Received:2018-03-22 Online:2018-04-15 Published:2018-04-15
  • Contact: Mary Bartlett Bunge, Ph.D.,mbunge@miami.edu
  • Supported by:

    NINDS R01NS09923 (MBB), R01NS081040 (JKL), The Miami Project to Cure Paralysis, and the Buoniconti Fund.

摘要:

许旺细胞移植是治疗脊髓损伤(SCI)的有前景的疗法,目前正在进行的临床试验正在验证其治疗效果。由于巨噬细胞是脊髓损伤部位重要的效应细胞,是受损脊髓急性炎症环境的主要贡献者,实验假设在巨噬细胞清除后移植许旺细胞有利于提高细胞存活率,并促进其与宿主组织的整合。为了验证这一假设,实验建立脊髓T8中度挫伤大鼠模型,然后随机给予或不给予腹腔注射氯膦酸二钠脂质体以清除巨噬细胞,并于脊髓挫伤后1周移植许旺细胞。T5节段腰髓注射生物素化葡聚糖胺(BDA)以评估轴突再生。以BBB运动测试、Gridwalk测试和评估感觉功能的Von Frey纤维丝测痛仪评估大鼠功能恢复情况。采用免疫组织化学染色法检测脊髓囊肿和病变体积、许旺细胞存活,以及生物素化葡聚糖胺阳性轴突的数量。在脊髓损伤后8周,巨噬细胞清除联合许旺细胞移植组大鼠脊髓囊肿和病变体积比单独许旺细胞移植组明显减小。然而,这些变化与许旺细胞存活、轴突生长或运动恢复的改善无关。由此说明虽然许旺细胞移植联合巨噬细胞清除确实改善了脊髓挫伤的病理损害,但是促进轴突生长和行为恢复的表现并不比单独移植许旺细胞效果好。

 

关键词: 神经再生, 许旺细胞, 轴突再生, 细胞存活, 运动功能, 感觉功能, 囊肿, 细胞移植

Abstract:

Schwann cell transplantation is a promising therapy for the treatment of spinal cord injury (SCI) and is currently in clinical trials. In our continuing efforts to improve Schwann cell transplantation strategies,we sought to determine the combined effects of Schwann cell transplantation with macrophage depletion. Since macrophages are major inflammatory contributors to the acute spinal cord injury, and are the major phagocytic cells, we hypothesized that transplanting Schwann cells after macrophage depletion will improve cell survival and integration with host tissue after SCI. To test this hypothesis, rat models of contusive SCI at thoracic level 8 were randomly subjected to macrophage depletion or not. In rat subjected to macrophage depletion, liposomes filled with clodronate were intraperitoneally injected at 1, 3, 6, 11, and 18 days post injury. Rats not subjected to macrophage depletion were intraperitoneally injected with liposomes filled with phosphate buffered saline. Schwann cells were transplanted 1 week post injury in all rats.Biotinylated dextran amine (BDA) was injected at thoracic level 5 to evalute axon regeneration. The Basso,Beattie, and Bresnahan locomotor test, Gridwalk test, and sensory test using von Frey filaments were performed to assess functional recovery. Immunohistochemistry was used to detect glial fibrillary acidic protein, neurofilament, and green fluorescent protein (GFP), and also to visulize BDA-labelled axons. The GFP labeled Schwann cell and cyst and lesion volumes were quantified using stained slides. The numbers of BDA-positive axons were also quantified. At 8 weeks after Schwann cell transplantation, there was a significant reduction in cyst and lesion volumes in the combined treatment group compared to Schwann cell transplantation alone. These changes were not associated, however, with improved Schwann cell survival,axon growth, or locomotor recovery. Although combining Schwann cell transplantation with macrophage depletion does improve histopathology of the injury site, the effect on axon growth and behavioral recovery appears no better than what can be achieved with Schwann cell transplants alone

Key words: Schwann cell, liposome, clodrosome, clodronate, axon regeneration, Schwann cell survival, neuroprotection, glial scar, cyst, cell transplantation