摘要目的 观测成骨细胞特异性钙黏蛋白(Cad-Ⅱ)基因转染对人骨髓基质干细胞(hBMSCs)成骨分化的影响. 方法把脂质体介导的Cad-Ⅱ cDNA转染体外分离培养的hBMSCs,检测Cad-Ⅱ蛋白表达变化,并对比观测转染组和单纯成骨诱导组在培养3,7、14、21 d时,hBMSCs碱性磷酸酶(ALP)和骨钙索的表达变化. 结果 转染组和成骨诱导组3 d后开始有ALP的阳性染色,呈棕黑色,7 d开始有骨钙索的阳性染色并随培养时间延长逐渐增多,但各时间点转染组ALP浓度(P=0.008)和骨钙素染色阳性数(P=0.023)均显著高于单纯成骨诱导组.转染组和成骨诱导组从14 d后开始有红色的刚件染色矿化结节出现,结节数目随时间推移而增多. 结论 Cad-Ⅱ基因转染可促进hBMSCs向成骨细胞的分化.

abstractsObjective To study the effects of Cad-Ⅱgene on osteogenic differentiation of human mesenchymal stem cells in vitro. Methods The human marrow mesenchymal stem cells (hBMSCs) were isolated and cultured in vitro before they were divided into 2 groups. In the transfeetion group, the hBMSCs were transfeeted with Cad- Ⅱgene;in the simple osteogenic inducement group, they were cultured in the condition medium. Then the expressions of Cad- Ⅱ protein were determined and the alkaline phosphatase (ALP) activities and the expressions of ostcocalein were measured at 3, 7, 14 and 21 days for comparison between the 2 groups. Results The ALP activity and positive expression of osteoealcin were regulated significantly higher in the transfeetion group than in the simple osteogenic inducement group at different times (P <0.05). The mineralized nodes began to appear at 14 days in the 2 groups and increased with time. Conclusion Cad-Ⅱgene transfeetion can promote differentiation of hBMSCs into the osteoblasts.