大鼠胚胎神经上皮细胞脑内移植治疗帕金森病的实验研究

目的 观察大鼠胚胎神经上皮细胞植入帕金森病大鼠纹状体后的存活、分化情况及治疗作用。方法 孕11d大鼠剖腹取胚胎，剥离神经管，胰酶消化后获取神经管壁上的神经上皮细胞，在脑立体定位仪下植入帕金森病大鼠毁损侧纹状体内，于移植后不同时间诱发旋转实验，观察症状的改善，并灌注取脑，切片后做酪氨酸羟化酶(TH)免疫组织化学染色，检测胚胎神经上皮细胞的存活及分化状况。结果 胚胎神经上皮细胞脑内移植后，帕金森病鼠的旋转行为有明显改善。移植后2、4及8周时可检测到成片或散在的TH-免疫阳性细胞。结论 胚胎神经上皮细胞移植至帕金森病大鼠纹状体后，可分化为多巴胺能神经元并能改善旋转症状。

AN EXPERIMENTAL STUDY ON THE THERAPY OF PARKINSON DISEASE BY NEUROEPITHELIAL CELL TRANSPLANTATION INTO RAT BRAIN

Objective Embryonic neuroepithelial cells (NEC) were transplanted into the brains of Parkinson disease rats, the survival and differentiation of NEC were investigated. Methods Embryonic rats (E11) were obtained from the pregnant Wistar rats. Neuroepithelial cells were dissociated from embryonic neural tube and treated with 0^25% trypsin, then transplanted them into the striatum of Parkinson disease (PD) rats stereotaxicly. Coronal sections of the brain were made in cryostat. The survival of transplant neuroepithelial cells and tyrosine hydroxylase (TH) expression of some NEP were examined by immunocytochemical technique, also the rotation behavior was tested following different time of transplantation. Results Some grafts were found survived well and some TH-positive cells could be detected in the core of graft region. NEP transplantation could also partly improve the symptoms of PD rats.Conclusion The results demonstrate that embryonic stem cells dissociated from neural tube can survive and differentiate into dopaminergic neurons. NECs contribute to the behavioral recovery.