BACKGROUND:Stem cel therapy is superior to drug therapy for recovery of patient’s physiological mode, and cel transplantation therapy is becoming a trend. OBJECTIVE:To observe the changes in dopamine content in the stratum of Parkinson’s disease rats after transplantation of tyrosine hydroxylase-modified human umbilical cord blood mesenchymal stem cel s. METHODS:After identification by enzyme digestion, pEGFP-C2-TH plasmid was transfected into the fourth generation of human umbilical cord blood mesenchymal stem cel s by electroporation method, and then transfected cel s were injected into the right cerebral ventricle of Parkinson’s disease rats (experimental group). PBS injection was performed in the control group. Migration of dopamine in the brain tissue of rats was observed, and the content of dopamine was detected by high performance liquid chromatography. RESULTS AND CONCLUSION:At 8 weeks after cel transplantation, the cel s gradual y migrated to the ventricles;after 12 weeks, the cel s migrated to the cortex, and expressed tyrosine hydroxylase antigen. Meanwhile, the content of dopamine was significantly higher in the experimental group than the control group (P<0.05). These results reveal that the intraventricular transplantation of tyrosine hydroxylase-modified human umbilical cord blood mesenchymal stem cel s has obvious therapeutic effect on Parkinson’s disease rats.%背景：研究表明，干细胞治疗比药物治疗更接近于恢复患者的生理模式，细胞移植治疗已逐渐成为一种趋势。目的：观察酪氨酸羟化酶修饰的脐血间充质干细胞移植后帕金森病大鼠纹状体内多巴胺含量的变化。 方法：将酶切鉴定后的新构建质粒pEGFP-C2-TH经电穿孔法转染第3代脐血间充质干细胞，注射到帕金森病大鼠右侧脑室，对照组注入PBS。观察移植细胞在大鼠脑组织内的迁移情况，高效液相色谱仪检测大鼠纹状体内多巴胺的含量。 结果与结论：质粒pEGFP-C2-TH转染的脐血间充质干细胞移植后8周，细胞逐渐向脑室转移，12周时迁移至皮质，可表达酪氨酸羟化酶抗原，且实验组多巴胺含量明显高于对照组(P<0.05)。结果表明酪氨酸羟化酶修饰的脐血间充质干细胞经脑室移植对帕金森病大鼠具有明显的治疗作用。
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