目的构建前列腺癌特异性启动子PSAe(AREc)-PSMAe-TARPp[P(A)PTp],并在腺病毒水平评价其启动目的基因表达的效率和特异性。方法巢式PCR扩增基因组DNA获得PSAe的AREc区基因、PSMAe基因和TARPp基因,并依次连接获得嵌合启动子P(A)PTp。采用A...目的构建前列腺癌特异性启动子PSAe(AREc)-PSMAe-TARPp[P(A)PTp],并在腺病毒水平评价其启动目的基因表达的效率和特异性。方法巢式PCR扩增基因组DNA获得PSAe的AREc区基因、PSMAe基因和TARPp基因,并依次连接获得嵌合启动子P(A)PTp。采用Adeasy系统构建并制备P(A)PTp启动增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)表达的重组腺病毒Ad-pSh-P(A)PTp-EGFP。不同感染复数(multi-plicity of infection,MOI)的Ad-pSh-CMV-EGFP感染各细胞系后48 h,流式细胞术确定最佳MOI;并以最佳MOI的Ad-pSh-P(A)PTp-EGFP感染各细胞系,检测EGFP的表达效率。结果 PCR成功扩增并连接获得嵌合启动子基因P(A)PTp。采用Adeasy系统,构建并制备了重组腺病毒Ad-pSh-P(A)PTp-EGFP。Ad-pSh-CMV-EGFP感染后,流式检测结果显示,前列腺癌细胞PC3和PC3M细胞的最佳MOI为100 MOI;而前列腺癌细胞DU145以及肝癌细胞SMMC-7721和HepG2为250 MOI。最佳MOI的Ad-pSh-P(A)PTp-EGFP感染后,EGFP在各细胞系中的表达效率[P(A)PTvsCMV]为:PC3(25.56%vs77.76%)、DU145(50.50%vs65.26%)、PC3M(30.81%vs89.70%)、HepG2(6.26%vs63.76%)、7721(2.27%vs67.84%)。结论成功构建前列腺癌特异性嵌合启动子P(A)PTp,并证实能在前列腺癌细胞中特异并有效地启动EGFP的表达。展开更多
There are three non-allelic isogenes encoding phosphoribosylanthranilate isomerase (PAI) in Arabidopsis thaliana. The expression plasmids were constructed by fusion of the GUS reporter gene to the three PAI promoters ...There are three non-allelic isogenes encoding phosphoribosylanthranilate isomerase (PAI) in Arabidopsis thaliana. The expression plasmids were constructed by fusion of the GUS reporter gene to the three PAI promoters with or without the 5' region encoding PAI N-terminal polypeptides and transferred into Arabidopsis plants by Agrobacterium tumefaciens. Analysis of GUS activity revealed that the PAI 5' coding region was necessary for high expression of GUS activity. GUS activity in transgenic plants transformed with the expression plasmids containing the 5' coding region of PAH or PAD was 60-100-fold higher than that without the corresponding 5' region. However, the effect of 5' coding region of PAI2 gene on the GUS activity was very small (only about 1 time difference) . The GUS histochemical staining showed a similar result as revealed by GUS activity assay. It was expressed in the mesophyll cells and guard cells, but not in the epidermic cells, indicating that the N-terminal polypeptides encoded by the 5' region of PAI genes have the function of PTP.展开更多
文摘目的构建前列腺癌特异性启动子PSAe(AREc)-PSMAe-TARPp[P(A)PTp],并在腺病毒水平评价其启动目的基因表达的效率和特异性。方法巢式PCR扩增基因组DNA获得PSAe的AREc区基因、PSMAe基因和TARPp基因,并依次连接获得嵌合启动子P(A)PTp。采用Adeasy系统构建并制备P(A)PTp启动增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)表达的重组腺病毒Ad-pSh-P(A)PTp-EGFP。不同感染复数(multi-plicity of infection,MOI)的Ad-pSh-CMV-EGFP感染各细胞系后48 h,流式细胞术确定最佳MOI;并以最佳MOI的Ad-pSh-P(A)PTp-EGFP感染各细胞系,检测EGFP的表达效率。结果 PCR成功扩增并连接获得嵌合启动子基因P(A)PTp。采用Adeasy系统,构建并制备了重组腺病毒Ad-pSh-P(A)PTp-EGFP。Ad-pSh-CMV-EGFP感染后,流式检测结果显示,前列腺癌细胞PC3和PC3M细胞的最佳MOI为100 MOI;而前列腺癌细胞DU145以及肝癌细胞SMMC-7721和HepG2为250 MOI。最佳MOI的Ad-pSh-P(A)PTp-EGFP感染后,EGFP在各细胞系中的表达效率[P(A)PTvsCMV]为:PC3(25.56%vs77.76%)、DU145(50.50%vs65.26%)、PC3M(30.81%vs89.70%)、HepG2(6.26%vs63.76%)、7721(2.27%vs67.84%)。结论成功构建前列腺癌特异性嵌合启动子P(A)PTp,并证实能在前列腺癌细胞中特异并有效地启动EGFP的表达。
基金Project supported by the National Distinguished Young Scholar Grant
文摘There are three non-allelic isogenes encoding phosphoribosylanthranilate isomerase (PAI) in Arabidopsis thaliana. The expression plasmids were constructed by fusion of the GUS reporter gene to the three PAI promoters with or without the 5' region encoding PAI N-terminal polypeptides and transferred into Arabidopsis plants by Agrobacterium tumefaciens. Analysis of GUS activity revealed that the PAI 5' coding region was necessary for high expression of GUS activity. GUS activity in transgenic plants transformed with the expression plasmids containing the 5' coding region of PAH or PAD was 60-100-fold higher than that without the corresponding 5' region. However, the effect of 5' coding region of PAI2 gene on the GUS activity was very small (only about 1 time difference) . The GUS histochemical staining showed a similar result as revealed by GUS activity assay. It was expressed in the mesophyll cells and guard cells, but not in the epidermic cells, indicating that the N-terminal polypeptides encoded by the 5' region of PAI genes have the function of PTP.
