靶向VEGF的miRNA对恶性黑色素细胞增殖和凋亡的影响 |
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引用本文: | 蒋 源,韩永智,孙 建. 靶向VEGF的miRNA对恶性黑色素细胞增殖和凋亡的影响[J]. 南方医科大学学报, 2014, 34(3): 358-367 |
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作者姓名: | 蒋 源 韩永智 孙 建 |
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摘 要: | 目的研究靶向血管内皮生长因子(VEGF)基因的外源性miRNA对恶性黑色素瘤细胞增殖及凋亡的影响。方法根据 VEGF基因序列设计合成4对miRNA干扰片段,构建质粒真核表达载体,分别为X-26-1-3、X-26-2n-1、X-26-3-2和X-26-4-4,测 序分析鉴定插入序列的完整性;脂质体法将该4 个重组表达载体转染黑色素瘤细胞株SKmel-28,RT-PCR 检测转染细胞中 VEGF基因的mRNA表达变化,Western blotting 检测miRNA对VEGF蛋白表达水平的调控效应,明确抑制效果最为显著的 miRNA干扰序列。MTS法和流式细胞仪分别检测人工合成的靶向VEGF的miRNA对SKmel-28生长的抑制作用,以及对肿瘤 细胞凋亡的影响。结果测序分析证实4个重组体插入片段的碱基序列均完全正确,成功转染SKmel-28细胞后,均能显著抑制 肿瘤细胞VEGF mRNA和蛋白的表达,与对照组相比有显著性差异(P<0.01)。抑制效应最强的重组载体是X-26-2n-1,MTS法 和流式细胞仪检测显示,SKmel-28细胞转染X-26-2n-1后,细胞增殖受到明显抑制,增殖抑制效应具有时间依赖性,与阴性对照 组比较差异具有显著性(P<0.05),与空白组比较细胞增殖抑制更加明显(P<0.01);肿瘤细胞早期凋亡率、晚期凋亡率、总凋亡率 也显著高于对照组(P<0.01)。结论外源性靶向VEGF的miRNA能够显著降低黑色素瘤细胞SKmel-28 VEGF基因和蛋白的 表达水平,抑制肿瘤细胞增殖,诱导细胞凋亡。
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Targeting microRNA-mediated suppression of vascular endothelial growth factor geneexpression and proliferation in malignant melanoma cells in vitro |
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Abstract: | Objective To explore the inhibitory effect of targeting miRNA on the expression of vascular endothelial growth factor (VEGF) and cell proliferation in malignant melanoma (MM) SKmel-28 cells. Methods Recombination miRNA plasmid vectors targeting VEGF gene were transfected into SKmel-28 cells via Lipofectamine 2000. The integrity of the inserted fragments was detected using colony PCR and sequence analysis. The expression of VEGF mRNA and protein in SKmel-28 cells was detected by RT-PCR and Western blotting, respectively. MTS assay was used to determine the inhibitory effect of a selected targeting miRNA on SKmel-28 cell proliferation, and the apoptosis of SKmel-28 cells was detected using flow cytometry. Results Transfection with the targeting miRNAs significantly down-regulated the expressions of VEGF mRNA and protein in SKmel-28 cells (P<0.01), and the miRNA construct X-26-2n-1 showed the highest inhibitory effect. The miRNA X-26-2n-1 significantly suppressed SKmel-28 cell proliferation in a time-dependent manner (P<0.01) and increased the early, late and overall apoptosis rates of the cells (P<0.01). Conclusion The targeting miRNA we constructed can effectively suppress the cell proliferation and induce apoptosis of SKmel-28 cells by down-regulating the expressions of VEGF gene.
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