嗅球成鞘细胞植入大鼠挫伤脊髓内的迁移分布特征

目的 观察嗅球成鞘细胞(olfactory ensheathing cells,OECs)在损伤脊髓内的迁移分布与脊髓功能恢复的关系.方法 用NYU-impactorⅡ装置以10 g·25 mm损伤大鼠T10脊髓,1周后将急性分离、纯化、鉴定的绿色荧光蛋白(GFP)-大鼠OECs植入脊髓损伤部位及其首尾两侧,OECs的移植量为90 000/μl.在移植后13周时间内,镜下定性观察OECs在冰冻切片上的迁移分布特征,然后对其分布面积和长度进行半定量观察.脊髓运动功能用BBB评分法测定.结果 移植后早期OECs主要聚集在移植部位,并逐渐向周围迁移扩散,但主要沿脊髓纵轴向首尾方向扩展,脊髓空腔内也可见移植的OECs.OECs的分布面积和长度分别由术后1周时的1.33 mm2和4.23 mm逐步扩大到13周时的3.30 mm2和7.68 mm.与此同时,大鼠损伤脊髓的运动功能也得到逐步恢复.结论 OECs植入挫伤脊髓后可以迁移游走,且与大鼠脊髓运动功能恢复有一定关系.

Abstract：

Objective To observe the migration and distribution of OECs in injured spinal cord and discuss their relation with the recovery of spinal cord function. Methods The rats were contused by a force of 10 g · 25 mm with NYU-impactor at T10 level. The OECs acutely isolated from green fluorescence protein (GFP) rats were purified, identified and then transplanted into the injured site and the rostral and caudal parts of the spinal cord one week after injury, with total volume of the transplanted OECs for 90 000/μl. Within 13 weeks after transplantation, the migration and distribution of OECs were qualitatively observed on the cryo-sections under fluorescence light microscope. The area and the length of OECs distribution were semi-quantitatively determined. The locomotor function of the spinal cord was appraised by BBB score. Results OECs were located collectively in the transplanted site at early stage after transplantation and then spread gradually mainly along the long axis of the cord. OECs could be found in the cavity of the contused spinal cord. The area and the length of OECs distribution were increased from 1.33 mm2 and 4.23 mm respectively at one week to 3.30 mm2 and 7.68 mm respectively at 13 weeks after transplantation. In the meantime, the locomotor function was gradually improved. Conclusion OECs can migrate within the contused spinal cord, as may contribute to the recovery of locomotor function.

Distrabution and migration of olfuctory ensheathing cells transplanted into the contused spinal cord of rats

Objective To observe the migration and distribution of OECs in injured spinal cord and discuss their relation with the recovery of spinal cord function. Methods The rats were contused by a force of 10 g · 25 mm with NYU-impactor at T10 level. The OECs acutely isolated from green fluorescence protein (GFP) rats were purified, identified and then transplanted into the injured site and the rostral and caudal parts of the spinal cord one week after injury, with total volume of the transplanted OECs for 90 000/μl. Within 13 weeks after transplantation, the migration and distribution of OECs were qualitatively observed on the cryo-sections under fluorescence light microscope. The area and the length of OECs distribution were semi-quantitatively determined. The locomotor function of the spinal cord was appraised by BBB score. Results OECs were located collectively in the transplanted site at early stage after transplantation and then spread gradually mainly along the long axis of the cord. OECs could be found in the cavity of the contused spinal cord. The area and the length of OECs distribution were increased from 1.33 mm2 and 4.23 mm respectively at one week to 3.30 mm2 and 7.68 mm respectively at 13 weeks after transplantation. In the meantime, the locomotor function was gradually improved. Conclusion OECs can migrate within the contused spinal cord, as may contribute to the recovery of locomotor function.