嗅鞘细胞移植对创伤性脑损伤大鼠神经功能和突触密度的影响

目的 研究嗅鞘细胞(olfactory ensheathing cells,OECs)移植对创伤性脑损伤(traumatic brain injuries,TBI)大鼠神经生理功能恢复的影响及其作用机制.方法 成年SD大鼠以随机数字表法分为假手术组、自由落体致大脑运动皮质区脑挫伤组、脑损伤后嗅鞘细胞移植组.先制备大鼠TBI模型.体外培养、纯化并鉴定嗅鞘细胞后将其移植入损伤脑组织周围.术后14 d对各组大鼠进行感觉诱发电位(CSEP)和运动诱发电位(MEP)神经电生理检测后,取损伤处及其邻近脑组织以突触素抗体免疫组化染色显示各组突触数量变化.用单因素方差分析进行统计学分析.结果 体外培养的细胞经鉴定为嗅鞘细胞,移植入损伤脑组织后14 d,嗅鞘细胞移植组的CSEP和MEP较单纯损伤组明显改善.且突触数量增多.结论 嗅鞘细胞移植可促进脑损伤大鼠神经生理功能恢复,并增加突触数量,为临床应用嗅鞘细胞治疗脑外伤提供了重要的实验证据.

Effect of olfactory entheath cells transplantation on neurophysiological function and synaptic density in rats with traumatic brain injuries

Objective To investigate the effect of olfactory entheath cells (OECs) transplantation on neural function and synaptic density of rats with traumatic brain injuries (TBI) and the possible mechanism. Methods Rats were divided into sham operation group, TBI group and OECs engrafted group. The brains of the rats were injured by Feeney percussion device through free falling. After cultured and identified by using specific marker (known as P75), OECs were transplanted into the area around the injured brain. Cortical somatosensory evoked potential (CSEP) and motor evoked potential ( MEP) were evaluated at day 14 after cell transplantation to determine the neurophysiologic function following TBI. Moreover, the synaptic densities around the injured brain were determined by using immunohistochemical method. One-way ANOVA test was used for statistical analysis. Results The transplanted OECs could survive and migrate around the injury site in the host brain 14 days after OECs transplantation. In addition, rats subjected to OECs implantation showed a marked neurophysiologic improvement and a significant increase of synaptic densities compared with the control group. Conclusion OECs transplantation can improve the neurophysiologic function and increase the synaptic density, which provides experimental basis for treatment of TBI with OECs.