胚胎干细胞移植对转化生长因子β1和髓鞘碱性蛋白影响

背景：多项研究证实胚胎干细胞诱导的神经前体细胞能够促进脊髓损伤大鼠功能的恢复。 目的：观察胚胎干细胞经体外诱导培养的神经前体细胞在脊髓损伤大鼠中的作用。 方法：144只大鼠随机分为3组，实验组和对照组建立大鼠脊髓全横断模型，实验组造模后在椎管内损伤区上下两端注射胚胎干细胞衍生细胞；对照组于相同部位注射PBS；假手术组仅行椎板切除，不损伤脊髓，不做其他处理。 结果与结论：对照组和实验组大鼠造模后21 d后，对照组脊髓损伤区域转化生长因子β1表达显著高于实验组（P〈0.05）。各时间点实验组大鼠脊髓中髓鞘碱性蛋白表达量显著高于对照组（P〈0.05）。细胞移植后各时间点实验组BBB评分明显优于对照组（P〈0.05）。提示胚胎干细胞培养诱导分化为神经前体细胞移植后期可降低转化生长因子β1的表达，并可以提高髓鞘碱性蛋白的表达变化，有助于大鼠全横断脊髓损伤的恢复。

Embryonic stem cells transplantation effects on expression of transforming growth factor beta 1 and myelin basic protein

BACKGROUND：Several studies have demonstrated embryonic stem cells induced neural precursor cells can promote functional recovery in rats with spinal cord injury. OBJECTIVE：To study the effect of in vitro cultured embryonic stem cells induced neural precursor cells in rats with spinal cord injury. METHODS：Total y 144 rats were randomly divided into three groups. Experiment group and control group rats had spinal cord transection injury. Embryonic stem cells-derived cells were injected into the vertebral canal at rostral and caudal segment perilesional y for the experiment group whereas PBS solution was injected instead of cells in the control group. Sham surgery group rats had only laminectomy without any spinal cord injury and treatment. RESULTS AND CONCLUSION：The experimental result showed that at day 21 post-injury, the regional expression of transforming growth factor-β1 was greater in rats from the control group in comparison to the experiment group （P＆lt;0.05）. At each time point after spinal cord injury in rats, the expression of myelin basic protein in the spinal cord was significantly higher in the experiment group than the control group （P＆lt;0.05）. After celltransplantation, Basso, Beattie, and Bresnahan scores of the experiment group at different time points were significantly higher than those of the control group （P＆lt;0.05）. Transplantation of in vitro cultured embryonic stem cells induced neural precursor cells can reduce the late expression of transforming growth factor-β1, and can increase the expression of myelin basic protein which contributes to the recovery of rats with completely transected spinal cord injury.