骨髓间充质干细胞在视网膜色素变性大鼠视网膜下的分化

目的:研究骨髓间充质干细胞（MSC）在视网膜色素变性（RP）大鼠体内的分化。方法:Lewis大鼠腹腔注射30g/L NaIO₃ 100mg/kg,建立大鼠RP模型,将体外培养的MSC植入视网膜下腔,用免疫荧光标记的方法对MSC进行追踪,并观察术后第1,2,3,4,5wk MSC在该微环境中的分化。结果:术后第1wk即可见MSC位于视网膜色素上皮（RPE）层与光感受器细胞层,但全角蛋白（PCK）及rhodopsin标记阴性,第3wk开始可见MSC在体内表达PCK及rhodopsin。结论:MSC植入RP模型大鼠视网膜下腔后可存活,主要分布于RPE层和视锥、视杆细胞层,并表达RPE细胞和光感受器细胞的表面标志。

Differentiation of mesenchymal stem cell in the microenviroment of retinitis pigmentosa

AIM: To assess the differentiation of rat mesenchymal stem cell (MSC) in the microenvironment of retinitis pigmentosa(RP) induced by the administration of sodium iodate. METHODS: In vitro cultured Lewis rat MSC were injected into the subretinal space of NaIO3 induced RP rat eyes (30g/L NaIO3 100mg/kg). To observe the trace and differentiation of MSC by immuno-fluorescent method successively in 5 weeks after the surgery.RESULTS: The majority of the transplanted cells stay in retinal pigment epithelium(RPE) layer and cones and rods layer. From the 2nd week after transplantation, the engrafted MSC expressed PCK and rhodopsin under fluorescent microscope.CONCLUSION: MSC can survive mainly in the outer layer of retina in the microenvironment of RP and differentiate forward the RPE cell and photoreceptor.