重组CKB真核表达载体的构建及其稳定转染NCI—H520细胞系的建立

Construction of eukaryotic expression plasmid of human CKB and establishment of NCI-H520 cell line stably transfected with the constructed plasmid

目的构建pEGFP—N1－CKB真核表达载体并将其稳定转染到肺鳞癌细胞NCI—H520中，建立稳定转染的NCI—H520细胞系，为后续研究奠定基础。方法以人CKBcDNA文库为模板，用PCR扩增人CKBcDNA的编码区，并将扩增的cDNA片段与载体连接后亚克隆到真核表达载体pEGFP-N1中。重组子经酶切分析及测序鉴定后，用脂质体转染技术将其导入到人肺鳞癌细胞系NCI—H520，经G418筛选并建立稳定的转染细胞株，应用Westernblot检测转染前后该细胞株CKB基因的表达。结果pEGFP—N1－CKB经酶切鉴定及DNA测序证实序列完全正确，真核表达载体构建成功；经Westernblot检测，重组质粒转染株中CKB基因的表达水平明显高于对照组，证实CKB基因已稳定转染到NCI-H520细胞中并得到表达。结论成功构建了pEGFP—N1－CKB真核表达质粒，建立了稳定表达CKB的NCI-H520细胞系，为进一步研究CKB的生物学功能奠定了基础。

Objective To construct an eukaryotic expression vector pEGFP-N1-CKB and establish a stably transfected NCI-H520 cell line. Methods Human CKB gene was amplified by PCR with human CKB cDNA library as tlle template and the fragment was combined with plasmid pEGFP-N1. The recombi- nant expression vector, pEGFP-N1-CKB, was transfectedto NCI-H520 using Lipofectamin. The stably transfected cell line was established after G418 selection and the expression level of CKB gene before and after transfection was detected by Western blot. Results After identification by restriction enzyme digestion and sequencing, the eukaryotic expression vector, pEGFP-N1-CKB, was successfully constructed. The expression level of CKB in NCI-H520 transfected by pEGFP-N1-CKB was significantly higher than that in control. CKB gene had a stable transfection in NCI-H520 cells. Conclusions An eukaryotic plasmid encoding CKB （pEGFP-N1-CKB） has been constructed and a cell line expressed CKB stably has been successfully prepared.