pEGFP-C3-hNIS重组质粒的构建及其在人胃癌BGC-823细胞的表达

目的构建人钠碘转运体（hNIS）基因真核绿色荧光蛋白融合表达载体pEGFP-C3-hNIS,并研究重组hNIS基因在人胃癌BGC-823细胞中的表达情况。方法采用Trizol一步法从甲状腺手术患者的甲状腺组织中提取总RNA,利用RT-PCR方法扩增得到hNIS的可编码区基因,并克隆到T载体上,测序后亚克隆到真核绿色荧光蛋白融合表达载体pEGFP-C3的多克隆位点,获得重组真核表达载体pEGFP-C3-hNIS。分别将pEGFP-C3-hNIS重组质粒（实验组）和pEGFP-C3（对照组）瞬时转染至人胃癌BGC-823细胞中,转染48 h后,于荧光显微镜下观察绿色荧光蛋白在细胞中的表达情况,并通过Western blot方法检测hNIS基因的蛋白表达水平。结果序列分析证实克隆片段与GenBank公布的hNIS基因序列（序列号：NM-000453）相似性达99.90%。转染48 h后,实验组与对照组细胞均可观察到较强绿色荧光信号,用hNIS基因特异性抗体检测表明实验组hNIS表达水平明显高于对照组。结论成功构建hNIS真核绿色荧光蛋白融合表达载体pEGFP-C3-hNIS,并能在人胃癌BGC-823细胞中高表达。

Construction of pEGFP-C3-hNIS and its expression in gastric carcinoma BGC-823 cells

Objective To construct the eukaryotic green fluorescent protein fusion expression vector pEGFP-C3-human sodium iodide symporter(hNIS) and to observe the expression of recombinant hNIS in gastric carcinoma BGC-823 cells.Methods Total RNA was extracted from the thyroid tissue samples by Trizol reagent,the hNIS gene was amplified by RT-PCR,and then cloned into vector pGEM-T for sequencing.Then,the identified cDNA was subcloned into eukaryotic green fluorescent protein fusion expression vector pEGFP-C3 and tran...