携带低氧诱导因子1α慢病毒感染大鼠骨髓间充质干细胞后成骨基因的表达

摘要

背景：人低氧诱导因子1α可调控其下游成骨及成血管基因的表达，具有提高成骨活性的作用。目的：观察携带人低氧诱导因子1α慢病毒感染的大鼠骨髓间充质干细胞中成骨基因表达情况。方法：通过RT-PCR方法从Hela细胞中获得低氧诱导因子1α，构建携带低氧诱导因子1α的慢病毒表达质粒Lenti-HIF-1α-eGFP，与LentiPac HIV混合包装质粒共包装293Ta细胞，获得病毒；采用全骨髓直接贴壁法分离培养大鼠骨髓间充质干细胞，使用流式细胞仪对骨髓间充质干细胞进行鉴定。分别在慢病毒感染骨髓间充质干细胞1，4，7，14 d后，用实时荧光定量PCR检测骨髓间充质干细胞中成骨基因骨形态发生蛋白2、骨钙蛋白、骨桥蛋白、碱性磷酸酶的表达水平。结果与结论：Lenti-HIF-1α-eGFP有效地感染骨髓间充质干细胞，实时荧光定量PCR检测结果显示成骨基因骨形态发生蛋白2、骨钙蛋白、骨桥蛋白、碱性磷酸酶在Lenti-HIF-1α-eGFP感染后第4天开始明显过表达，且持续至14 d。结果表明低氧诱导因子1α可以提高骨髓间充质干细胞的成骨活性。%BACKGROUND:Human hypoxia-inducible factor-1 alpha can regulate the expression of osteogenic and angiogenic genes, and promote osteogenic activity. OBJECTIVE:To observe the expression of osteogenic genes in rat bone marrow mesenchymal stem cells carrying human hypoxia-inducible factor-1 alpha slow virus infection. METHODS:Hypoxia-inducible factor-1 alpha was obtained from Hela cells using RT-PCR. Lentivirus expression vector plasmid carrying hypoxia-inducible factor-1 alpha (Lenti-HIF-1α-eGFP) was constructed. 293Ta cells with LentiPac HIV mixed packaging plasmid was packaged, and then lentivirus was obtained. Rat bone marrow mesenchymal stem cells were isolated and cultured using direct whole bone marrow adherent method. Bone marrow mesenchymal stem cells were identified using flow cytometry. Bone marrow mesenchymal stem cells were infected with slow virus for 1, 4, 7 and 14 days. Bone morphogenetic protein-2, osteocalcin, osteopontin and alkaline phosphatase expression levels were detected in bone marrow mesenchymal stem cells using real-time fluorescent quantitative PCR. RESULTS AND CONCLUSION:Bone marrow mesenchymal stem cells were effectively infected with Lenti-HIF-1α-eGFP. Real-time fluorescent quantitative PCR results revealed that bone morphogenetic protein-2, osteocalcin, osteopontin and alkaline phosphatase began to obviously overexpress from 4 days after infection with Lenti-HIF-1α-eGFP until 14 days. Results suggested that hypoxia-inducible factor-1 alpha could elevate the osteogenic activity of bone marrow mesenchymal stem cells.