血管内皮生长因子基因对人骨髓基质细胞增殖及代谢的影响

目的 观察血管内皮生长因子(VEGF)基因对人骨髓基质细胞(hBMSc)增殖、代谢的影响.方法 实验分为3组:①VEGF165和eGFP基因转染hBMSc组;②空腺病毒载体转染hBMSc组;③单纯hBMSc组.培养细胞,进行MTT检测,流式细胞仪分析细胞周期.取各组生长状态良好的第3代细胞,转染后,进行ALP含量检测,骨钙蛋白和层粘连蛋白榆测.结果 各组细胞数量随培养时间的延长都有所增加,各时间点经VEGF165基因转染的hBMSc吸光度值无显著性差异(p>0.05).经转染基因的hBMSc与转染空载体、未转染的hBMSc相比较,DNA合成前期细胞所占百分比无显著性差异,反应增殖活力的增殖指数PrI(包括DNA合成期、DNA合成后期和有丝分裂期)也无显著性差异(P>0.05).经转染的hBMSc碱性磷酸酶、骨钙蛋白和层粘连蛋白合成与转染空载体、未转染的hBMSc相比较有显著性差异(P<0.05),证实经转染的hBMSc碱性磷酸酶、骨钙蛋白和层枯连蛋白合成明显高于其他两组.结论 本实验证实了构建的Ad-VEGF165感染哺乳动物细胞后具有分泌VEGF165的能力,并获得了转VEGF165基因hBMSc.转染VEGF165对hBMSc体外增殖明显影响,同时可以显著提高BMSc分泌ALP,骨钙素(OC)和层粘连蛋白(LN),说明VEGF165对hBMSc体外向成骨细胞分化起到了促进作用.

Effect of vascular endothelial growth factor gene transfer on proliferation and metabolism of human bone marrow stromal cells in vitro

OBJECTIVE: To investigate the effect of vascular endothelial growth factor 165 (VEGF(165)) gene transfer on the proliferation and metabolism of human bone marrow stromal cells (hBMSCs) in vitro. METHODS: hBMSCs were divided into 3 groups and subjected to adenovirus mediated VEGF(165) gene transfection, transfection with empty adenoviral vector, or left untreated (control). MTT assay and flow cytometry were performed to analyze the proliferation of the cells after corresponding treatments. The third passage of hBMSCs (2x10(4)/ml), after corresponding transfection procedures, were cultured in conditional medium and tested for ALP content 2, 4 and 6 days after the transfection. Also at 3, 5 and 7 days after the transfection, the cells were examined for osteocalcin (C) and laminin (LN) contents. RESULTS: The number of cells in each group increased with the culture time without obvious differences in the optical density. No significant differences were noted between the 3 groups in the percentage of G1 phase cells or in the proliferation index (PrI) (P>0.05), but compared with the nontransfected and the empty vector-transfected cells, the cells with VEGF(165) gene transfection had significantly higher ALP, OC and LN contents (P<0.05). CONCLUSION: VEGf(165) gene transfer does not obviously affect the proliferation of cultured hBMSCs, but can increase the cellular secretion of AIP, C and LN, suggesting that VEGF(165) promotes the differentiation of hBMSCs into osteoblasts in vitro.