Abstract

利用原子转移自由基聚合(ATRP)将聚甲基丙烯酸 N , N -二甲氨基乙酯[P(DMAEMA)] 偶联到菊粉多糖(Inulin)上,合成了新型基因载体PDIN. 利用核磁共振仪、 动态光散射分析仪、 透射电子显微镜和凝胶电泳对PDIN及其与质粒pDNA的复合物进行了表征. 凝胶阻滞实验结果表明,PDIN可以通过静电相互作用稳定结合pDNA. 噻唑蓝(MTT)细胞毒性测试、 溶血实验、 绿色荧光蛋白表达质粒(pGFP)及 β 半乳糖苷酶表达质粒(p β gal)转染实验结果表明,PDIN对MCF-7,Hela,COS7和HepG2细胞的毒性较小;其溶血率低,具有良好的血液相容性;载体PDIN能有效将pGFP和p β gal带入COS7细胞并表达,在 N / P 为1时转染效率最高,其 β 半乳糖苷酶的酶活为(3.36±0.74) U/mg蛋白,比Lipo2000转染效率[(4.33±0.77) U/mg蛋白] 略低. 因此,所合成的载体PDIN是一种有潜在应用价值的非病毒基因载体.

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