脂质体介导入钠/碘同向转运体基因转染肺癌A549细胞及其蛋白表达

目的:研究人钠/碘同向转运体(NIS)基因转染肺癌细胞及其蛋白表达。方法:将体外培养的肺癌A549细胞分为实验组和对照两组:以脂质体Lipofectamihe2000为载体,分别介导转染重组质粒pcDNA3-hNIS和空质粒pcDNA3。NIS基因重组质粒pcDNA3-hNIS进行扩增、纯化,并经酶切鉴定和DNA测序。采用Western Blot法和免疫组化法分别检测转染肺癌细胞中NIS蛋白表达。结果:酶切鉴定和DNA测序结果表明重组质粒pcDNA3-hNIS中插入的hNIS基因片段大小、方向正确。WesternBlot法和免疫组化染色结果显示实验组有NIS蛋白表达,其阳性率达70.6%且主要分布于细胞膜而对照组无表达。两组比较有显著性差异(P=0.000)。结论:脂质体Lipofectamine 2000介导转染人钠/碘同向转运体基因pcDAN3-hNIS肺癌细胞能够成功地表达NIS蛋白。

Transfection of the Human Sodium/Iodide Symporter(NIS) Gene with Liposomes and the Expression of the NIS Protein in Human Lung A549 Cancer Cells

OBJECTIVE To examine the possibility of human sodium iodide sym- porter(hNIS)protein expression in lung cancer cells. METHODS Human lung A549 cancer cells were thawed and cultured in vitro.The cel s were divided into an experimental group transfected with a recombinant pcDNA3-hNIS plasmid and a control group transfected only with a pcDNA3 plasmid.The recombinant plasmid vector encoding the hNIS gene (pcDNA3-hNIS)was amplified,purified and identified.The hNIS gene was fol owed by DNA sequencing.A Western blot and an immunohistochemical assay were applied to detect the hNIS protein expression in the transfected human lung A549 cancer cells. RESULTS Restriction enzyme digestion and DNA sequencing results showed the size and direction of the inserted gene in the recombinant pcD- NA3-hNIS plasmid was correct.The Western blot method and immunohis- tochemical analysis showed a positive NIS protein expression in the experi- mental group.The NIS protein was detected mainly in the cel membranes showing a positive rate up to 70.6%with no expression of the NIS protein in the control group.There was a significant difference between two groups (P=0.000). CONCLUSION The hNIS gene was transfected effectively into human lung A549 cancer cells mediated by Lipofectamine 2000,and was expressed with its protein in vitro.