高压氧联合许旺细胞移植脊髓损伤大鼠电生理及后肢功能的变化

Hyperbaric oxygen combined with Schwann cells transplantation for spinal cord injury in rats:electrophysiological and functional changes of the hind limbs

背景:高压氧治疗可以改善脊髓损伤区微环境,联合许旺细胞移植有望提高大鼠脊髓损伤疗效。目的:观察高压氧联合许旺细胞移植对脊髓损伤大鼠神经功能恢复的影响。方法:80只雌性SD大鼠建立脊髓损伤模型后随机分成4组,每组20只,空白对照组和细胞移植组分别在建模6 h后尾静脉注射L-DMEM培养液和许旺细胞(3×106个)悬液,高压氧组建模1 h后开始高压氧治疗,联合组进行高压氧和许旺细胞移植联合治疗。于移植后1,3 d以及1,2,3,4周进行斜板试验、改良Tarlov评分,BBB评分评定大鼠后肢运动功能恢复情况;移植第4周PCR检测各组脊髓组织中SRY基因表达;移植第8周行辣根过氧化物酶示踪及神经电生理检测。结果与结论:联合组下肢运动功能优于细胞移植组和高压氧组,细胞移植组和高压氧组优于空白对照组。细胞移植组和联合组有SRY基因表达,对照组和高压氧组未检测到SRY基因。辣根过氧化物酶阳性神经纤维数:联合组>细胞移植组和高压氧组>空白对照组,差异有显著性意义(P<0.01)。联合组大鼠体感诱发电位及运动诱发电位的潜伏期、波幅明显优于其他3组(P<0.05或P<0.01)。结果提示高压氧与许旺细胞移植联合应用可促进脊髓损伤大鼠神经突触的再生,改善肢体运动功能和电生理功能,其治疗效果优于单独应用高压氧或许旺细胞。

BACKGROUND：Hyperbaric oxygen therapy can improve the microenvironment of the injured spinal cord, and hyperbaric oxygen combined with Schwann cel transplantation is expected to improve the therapeutic efficacy on spinal cord injury. OBJECTIVE：To investigate the effect of Schwann cel transplantation plus hyperbaric oxygen on the neural functional recovery of rats with spinal cord injury. METHODS：A total of 80 female SD rats with spinal cord injury were randomized into 4 groups, with 20 in each group：blank control group, injection of L-DMEM via the tail vein at 6 hours after modeling;cel transplantation group, injection of 3＆#215;106 RESULTS AND CONCLUSION：The motor function of the lower limbs was better in the combination group than the cel transplantation and hyperbaric oxygen groups, as wel as better in the cel transplantation group and Schwann cel suspension via the tail vein at 6 hours after modeling;hyperbaric oxygen group, hyperbaric oxygen therapy at 1 hour after modeling;combination group, combined therapy of Schwann cel transplantation and hyperbaric oxygen. Inclined plane test, modified Tarlov score, Basso-Beattie-Bresnahan score for motor function evaluation of rat hind limbs were performed and measured at 1, 3 days, 1, 2, 3, 4 weeks after treatment. SRY gene expression in the spinal cord was measured at 4 weeks after transplantation using PCR method. Horseradish peroxidase tracer and electroneurophysiology detection was done at 8 weeks after transplantation.hyperbaric oxygen groups than the blank control group. SRY expression was detected in the cel transplantation group and combination group, but not in the blank control group and hyperbaric oxygen group. The number of nerve fibers positive for horseradish peroxidase was higher in the combination group than the cel transplantation and hyperbaric oxygen groups fol owed by the blank control group, and there were significant differences between different groups （P〈0.01）. In addition, the latencies and amplitudes of somatosensory evoked potential and motor evoked potential in the combination group were also better than those in the other groups （P〈0.05 or P〈0.01）. These findings indicate that the combined therapy of Schwann cel transplantation and hyperbaric oxygen can promote the synaptic regeneration, improve limb motor function and electrophysiological function in rats with spinal cord injury, which is superior to hyperbaric oxygen or Schwann cel transplantation alone.