未知基因KH开放阅读框架真核表达载体的构建及其对K562细胞增殖的影响

Construction of eukaryotic expression vector of open reading frame of unknown KH gene and its effect on proliferation of K562 cell

目的 :构建未知基因KH的开放阅读框架 (openreadingframe,ORF)的真核表达体系 ,初步探讨未知基因KH的功能。方法 :采用DNA重组技术将KH基因片段的开放阅读框架 (KH -ORF)亚克隆于表达载体 pCl-neoMammalianExpres sionVector,重组为pCI-neo -KH -ORF真核表达体系 ,脂质体转染K5 6 2细胞 ,RT -PCR检测目的基因KH的表达。采用体外培养技术 ,通过 pCI -neo -KH -ORF质粒转染K5 6 2细胞前后的生长曲线和乳酸脱氢酶活性测定观察KH -ORF对K5 6 2细胞增殖速度的影响。结果 :KH -ORF在K5 6 2细胞中获得表达 ,对细胞增殖速度有明显影响。结论 :KH -ORF表达产物可能是一个与K5 6 2细胞增殖有关的功能蛋白质 。

Objective:To construct the eukaryotic expression vector of open reading frame of KH gene(KH-ORF),an unknown gene obtained from K562 cells,and investigate its function.Methods:The KH-ORF cDNA was cleaved from plasmid expression vector cut with the same restriction endonucleases.pCI-KH-ORF,the pGEM-T-easy-KH-ORF with EcoRI and SalI and subcloned into the pCl-neo mammalian recombinant expression plasmid,was transfected into K562 cells with liposome and screened by G418.KH-ORF expression was tested by RT-PCR.The effect of expression product on cell proliferation was tested by growth-curve and LDH detection.Results:KH-ORF was expressed in K562 cells.The effects of increased proliferation were significant.Conclusion:The product of KH-ORF may be a functional protein that is related to the proliferation of K562 cells,and KH gene may be a functional unknown leukemia gene.