中文摘要：

目的 筛选出更适宜的转染受体细胞,提高构建人寡肽转运体1（human peptide transporter 1,hPepT1）高表达细胞系的效率。方法 利用Lipofectamine^TM 2000转染试剂将pcDNA3.1（＋）-hPepT1质粒分别转染进MDCK细胞与HeLa细胞,并进行单克隆细胞的挑选和扩大培养。通过qRT-PCR与Western blot技术来检测两种受体细胞中hPepT1 mRNA与蛋白的表达水平,并利用超高效液相色谱-串联质谱法（UPLC-MS/MS）对两种单克隆转染细胞的hPepT1典型底物甘氨酰肌氨酸（Glysar）摄取能力进行考察。结果 MDCK细胞与HeLa细胞转染后,hPepT1 mRNA与蛋白表达水平以及Glysar的摄取能力均明显高于其野生型细胞（P〈0.05）;虽然Glysar在HeLa细胞中的摄取量高于MDCK细胞,但MDCK-hPepT1细胞中hPepT1 mRNA与蛋白表达水平以及Glysar的摄取能力却高于HeLa-hPepT1细胞。结论在hPepT1稳定高表达转染细胞模型的构建中,为提高hPepT1的转染效率,从而获得更高效的转染细胞模型,以MDCK细胞作为转染的受体细胞可能是更为适宜的选择。

英文摘要：

Aim To screen a more suitable transfection recep-tor,and improve the efficiency of constructing cell lines highly expressing human peptide transporters 1 （hPepT1 ）.Methods The recombinant plasmid pcDNA3.1 （＋）-hPepT1 was transfect-ed into MDCK cells and HeLa cells by Lipofectamine^TM 2000 transfection reagent,respectively.The monoclonal cells were se-lected and cultured.Expression of hPepT1 mRNA and protein were determined by qRT-PCR and Western blot,respectively. The uptake capacity of Glysar in transfected cells was examined. Results Compared with wild type cells,the expression of hPepT1 and the uptake of Glysar in transfected MDCK cells and HeLa cells significantly increased （P 〈0.05）.Although the up-take of Glysar in HeLa cells was higher than that of MDCK cells,on the contrary,the expression of hPepT1 and the uptake of Glysar in MDCK-hPepT1 cells was higher than that of HeLa-hPepT1 cells.Conclusion MDCK cells may serve as a more suitable transfected receptor for the construction of a cellular model with high expression of hPepT1 ,which would make the construction of a cell model highly expressing hPepT1 more effi-cient.