Abstract
目的 研究脂质体LipfectAMINETM(LR)介导的c-myc反义寡核苷酸(ASODN)对MCF-7细胞端粒酶活性的影响及其机制.方法 端粒重复序列扩增聚丙烯酰胺凝胶电泳(TRAP-PAGE)及端粒重复序列扩增酶联免疫吸附测定(TRAP-ELISA)定量检测不同时间段MCF-7细胞的端粒酶活性,流式细胞仪检测c-myc蛋白表达.结果 TRAP-PAGE结果显示,c-myc ASODN对MCF-7细胞的作用,随时间的递增(24 h、48 h、72 h),端粒酶梯度条带明显地减少,端粒酶活性明显降低.TRAP-ELISA显示,2.5μmol/L的c-myc ASODN作用MCF-7细胞48 h吸光度A值降为0.486.4±0.041,作用72 h A值降为0.263±0.034,与未经任何处理的MCF-7细胞A值0.684±0.031相比,端粒酶活性明显受到抑制,分别与正义寡核苷酸组、空白对照组相比差异有统计学意义(P<0.05).未经任何处理的MCF-7细胞c-myc蛋白阳性率为(99.684±2.937)%,经c-myc ASODN作用48h c-myc蛋白阳性率低至(61.295±2.825)%,c-myc ASODN作用72 h c-myc蛋白阳性率低至(29.482±2.726)%.而c-myc正义寡核苷酸(SODN)无上述作用.结论 c-myc ASODN能有效降低MCF-7细胞端粒酶活性和c-myc蛋白表达。
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