人骨髓间充质干细胞经肝细胞生长因子基因修饰后的促进鸡胚血管新生

Human Mesenchymal Stem Cells Modified by Hepatocyte Growth Factor Gene Promote Chicken Embryonic Angiogenesis

本研究目的是评价人骨髓间充质干细胞(human bone marrow mesenchymal stem cells,hBMMSC)经肝细胞生长因子基因(hepatocyte growth factor,HGF)修饰后的促血管新生效应,并初步分析其机理。利用重组腺病毒HGF转染hBMMSC,将细胞接种于鸡胚绒毛膜尿囊膜,与α-MEM、同代hBMMSC及bFGF比较,3天后计算其血管数量。用RT-PCR检测hBMMSC表达bFGF、VEGF、血管生成素-1和血管生成素-2的水平。结果表明:4个组中hBMMSC/HGF促血管生成能力最强,hBMMSC和bFGF组相近,α-MEM组最低。RT-PCR检测显示,hBMMSC和hBMMSC/HGF均表达多种促血管生成相关细胞因子,而HGF转染后表达水平升高。结论:经HGF基因修饰的hBMMSC具有较强的促血管新生的功能,本研究为缺血性疾病的治疗提供了有益的信息。

This study was purposed to investigate the angiogenesis-promoting activities of human mesenchymal stem cells （hMSCs） modified by hepatocyte growth factor （HGF） and the underlying mechanisms. The hMSCs were transfected by recombinant adenoviral vector carrying human HGF gene and seeded onto the chicken chorioallantoic membrane. Three days later, the number of blood vessels was counted and their angiogenic response was compared with those of hMSCs of same generation, recombinant basic fibroblast growth factor （bFGF） and alpha-MEM as control. The expression levels of bFGF, VEGF, angiopoietin-1 and angiopoietin-2 were evaluated by RT-PCR assay. The results showed that gene-modified hMSCs exhibited greatest activity to promote angiogenesis while the angiogenic response was nearly same between groups treated by hMSCs and bFGF, all of which were significantly higher than that observed in control （p 〈 0.01 ）. RT-PCR analysis revealed that hMSCs constitutively expressed multiple angiogenesis-associated growth factors and their levels seemed up-regulated by HGF gene transfer. It is concluded that HGF gene-modified hMSCs show a potent angiogenesis-promoting function and may be useful in the treatment of ischemic disorders.