阴离子脂质体－阳离子脂质体复合物介导的基因转染

目的评价阴离子脂质体-阳离子脂质体复合物介导质粒转移至HepG2肝癌细胞中及其毒副作用。方法制备携载表达绿色荧光蛋白质粒的阳离子脂质体,与阴离子脂质体形成复合物。测定脂质体复合物的zeta电位,凝胶阻滞实验考察质粒包封情况,流式细胞仪测量各阴离子脂质体-阳离子脂质体复合物的转染效率,MTT法检测细胞毒性。结果复合物能完全包裹质粒,其zeta电位低于阳离子脂质体zeta电位;脂质体复合物介导的转染效率略低于阳离子脂质体,其细胞生存率高于阳离子脂质体。结论阴离子脂质体-阳离子脂质体复合物在降低细胞毒性的同时,可实现对HepG2细胞较高的转染效率。

Study on transfection efficiency mediated by the complexes of lipoplexes and anionic liposomes

Objective To evaluate the efficiency of different complexes of lipoplexes and anionic liposomes which mediated gene transfection to hepatoma cells(HepG2). Methods Cationic liposomes encapsulating report gene were prepared by reverse-evaporation method,which were pipetted into anionic liposomes to form complexes. The zeta potentials were measured by Zetasizer Nano ZS. Report gene expressing green fluorescent protein(GFP) was used in order to evaluate transfection efficiency of different complexes. MTT was used to measure the cytotoxicity. Results The anionic liposomes contributed to lower zeta potentials while could not effect the capability of pDNA load efficiency. The transfection efficiency of complexes was lower than that of cationic liposomes, however,the complexes presented higher cell viability. Conclusion In relation to the low cytotoxicity of the complexes, their transfection efficiency was relatively high.