Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial...Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial scaffold materials, such as fibroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithe- lial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate. We hypothesized that amniotic epithelial cells combined with silk fibroin scaffolds would be conducive to the repair of spinal cord injury. To test this, we isolated and cultured amniotic epithelial cells, and constructed complexes of these cells and silk fibroin scaffolds. Implantation of the cell-scaffold complex into a rat model of spinal cord injury resulted in a smaller glial scar in the damaged cord tissue than in model rats that received a blank scaffold, or amniotic epithelial cells alone. In addition to a milder local immunological reaction, the rats showed less inflammatory cell infiltration at the trans- plant site, milder host-versus-graft reaction, and a marked improvement in motor function. These findings confirm that the transplantation of amniotic epithelial ceils combined with silk fibroin scaffold can promote the repair of spinal cord injury. Silk fibroin scaffold can provide a good nerve regeneration microenvironment for amniotic epithelial cells.展开更多
角膜移植术是角膜盲的有效治疗方式,是角膜盲患者复明的唯一希望。角膜无血管、无淋巴管,被称为免疫赦免器官,因此角膜移植术的成功率明显高于其他器官移植术,但角膜移植术后的排斥反应仍然是角膜移植术失败的主要原因。器官移植术后的...角膜移植术是角膜盲的有效治疗方式,是角膜盲患者复明的唯一希望。角膜无血管、无淋巴管,被称为免疫赦免器官,因此角膜移植术的成功率明显高于其他器官移植术,但角膜移植术后的排斥反应仍然是角膜移植术失败的主要原因。器官移植术后的免疫反应主要是免疫细胞向淋巴组织、炎症部位的定向移动,而调节性T细胞(regulatory T cells,Treg)在免疫调节中起着关键性作用,其可以通过调节和抑制效应T细胞的活化来诱导免疫耐受,从而减轻角膜移植术后的排斥反应。据此,文章对在角膜移植术后发生免疫排斥反应中Treg的来源、作用机制以及治疗等多方面做简单综述,同时也探讨了应用冬虫夏草提取物FTY720增强Treg的有效性,以期为后续针对性开展临床应用转化及基础研究提供一定的参考。展开更多
基金supported by the Scientific Research Project Fund of Wuxi Municipal Health and Family Planning Commission,No.MS201402
文摘Treatment and functional reconstruction after central nervous system injury is a major medical and social challenge. An increasing number of researchers are attempting to use neural stem cells combined with artificial scaffold materials, such as fibroin, for nerve repair. However, such approaches are challenged by ethical and practical issues. Amniotic tissue, a clinical waste product, is abundant, and amniotic epithe- lial cells are pluripotent, have low immunogenicity, and are not the subject of ethical debate. We hypothesized that amniotic epithelial cells combined with silk fibroin scaffolds would be conducive to the repair of spinal cord injury. To test this, we isolated and cultured amniotic epithelial cells, and constructed complexes of these cells and silk fibroin scaffolds. Implantation of the cell-scaffold complex into a rat model of spinal cord injury resulted in a smaller glial scar in the damaged cord tissue than in model rats that received a blank scaffold, or amniotic epithelial cells alone. In addition to a milder local immunological reaction, the rats showed less inflammatory cell infiltration at the trans- plant site, milder host-versus-graft reaction, and a marked improvement in motor function. These findings confirm that the transplantation of amniotic epithelial ceils combined with silk fibroin scaffold can promote the repair of spinal cord injury. Silk fibroin scaffold can provide a good nerve regeneration microenvironment for amniotic epithelial cells.
文摘角膜移植术是角膜盲的有效治疗方式,是角膜盲患者复明的唯一希望。角膜无血管、无淋巴管,被称为免疫赦免器官,因此角膜移植术的成功率明显高于其他器官移植术,但角膜移植术后的排斥反应仍然是角膜移植术失败的主要原因。器官移植术后的免疫反应主要是免疫细胞向淋巴组织、炎症部位的定向移动,而调节性T细胞(regulatory T cells,Treg)在免疫调节中起着关键性作用,其可以通过调节和抑制效应T细胞的活化来诱导免疫耐受,从而减轻角膜移植术后的排斥反应。据此,文章对在角膜移植术后发生免疫排斥反应中Treg的来源、作用机制以及治疗等多方面做简单综述,同时也探讨了应用冬虫夏草提取物FTY720增强Treg的有效性,以期为后续针对性开展临床应用转化及基础研究提供一定的参考。
