Objective：To express the melanoma associated gene MAGE-A9 recombinant protein, obtain the anti-MAGE-A9 monoclonal antibody and to examine the expression of MAGE-A9 in hapatocellular carcinoma specimens. Methods：MAGE...Objective：To express the melanoma associated gene MAGE-A9 recombinant protein, obtain the anti-MAGE-A9 monoclonal antibody and to examine the expression of MAGE-A9 in hapatocellular carcinoma specimens. Methods：MAGE-A9 cDNA was cloned from human hepatocellular carcinoma tissue by using RT-PCR, and then subcloned into the plasmid pMD18-T. After sequencing, the MAGE-A9 was cloned into the prokaryotic expression vector pBAD/gⅢ to construct the recombinant expression vector pBAD/gⅢ - MAGE-A9, and was transformed into E. coli TOP10. The recombinant MAGE-A9 protein was expressed under induction of L-Arabinose, and was purified through Hitrap column. The anti-MAGE-A9 monoclonal antibody was generated. The expression of MAGE-A9 in hepatocellular carcinoma specimens was examined through ABC assay. Results：The cDNA sequence of the cloned MAGE-A9 gene was consistent with the reported sequence. By affinity column and SDS-PAGE, the purified MAGE-A9 fusion protein displayed a band of Mr 35,000, and subsequently the anti-MAGE-A9 monoclonal antibody was obtained. We found that MAGE-A9 expressed in the cytoplast of positive cells and MAGE-A9 antigen was detected in 8 cases out of 39 （21%） hepatocellular carcinoma specimens. Conclusion：MAGE-A9 antigen was expressed in a fair proportion of hepatocellular carcinoma specimens, these patients might be suitable candidates for immune involving antigen, encoded by the MAGE-A9 gene.展开更多
目的:探讨人黑素瘤抗原-A(melanoma antigen-A,MAGE-A)对p53转录活性的影响。方法:选用p53缺失型人肺癌细胞系H1299,采用荧光素酶报告分析法、RT-PCR、Western印迹法、克隆形成实验和末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(termin...目的:探讨人黑素瘤抗原-A(melanoma antigen-A,MAGE-A)对p53转录活性的影响。方法:选用p53缺失型人肺癌细胞系H1299,采用荧光素酶报告分析法、RT-PCR、Western印迹法、克隆形成实验和末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling,TUNEL)等方法研究MAGE-A4对p53转录活性的影响。结果:荧光素酶报告分析结果显示,转染p53基因(25ng)可以使p21WAF1启动子介导的荧光素酶表达增加(P<0.01);共转染恒定量(25ng)的p53基因和不同量的MAGE-A4基因(100、200和400ng)后,p21WAF1启动子介导的荧光素酶表达均明显高于单独转染p53基因时的表达量(P<0.01)。RT-PCR和Western印迹法检测结果也显示,转染p53基因可以使p21WAF1mRNA和蛋白表达水平增加(P<0.01),共转染MAGE-A4基因和p53基因后,p21WAF1mRNA和蛋白表达水平均明显高于单独转染p53基因时的表达水平(P<0.01)。克隆形成实验及TUNEL染色结果显示,转染p53基因可以使H1299细胞克隆形成数减少及凋亡细胞数增加(P<0.01),共转染MAGE-A4基因和p53基因以后,H1299细胞克隆形成数与单独转染p53基因组相比减少,而凋亡细胞数与单独转染p53基因组比较增加(P<0.01)。结论:MAGE-A4可以增强p53的转录活性及功能发挥。展开更多
目的扩增和克隆人黑色素瘤抗原MAGE-A9(melanom a antigen A9)cDNA,构建原核表达载体,制备抗MAGE-A9单抗,观察其在肝细胞癌中的定位。方法从人肝癌组织提取总RNA,用RT-PCR从中扩增出MAGE-A9cDNA,插入载体pMD18-T中,测序正确后,构建重组...目的扩增和克隆人黑色素瘤抗原MAGE-A9(melanom a antigen A9)cDNA,构建原核表达载体,制备抗MAGE-A9单抗,观察其在肝细胞癌中的定位。方法从人肝癌组织提取总RNA,用RT-PCR从中扩增出MAGE-A9cDNA,插入载体pMD18-T中,测序正确后,构建重组表达载体pBAD/gI-II-MAGE-A9,转化大肠杆菌TOP10株进行表达。重组蛋白经L-Arabinose诱导表达纯化后,制备抗MAGE-A9单抗,免疫组化检测MAGE-A9在肝细胞癌中的表达和定位。结果获得AGE-A9cDNA,测序结果与GenBank一致。成功构建表达载体,表达可溶重组蛋白,SDS-PAGE分析其相对分子质量为35Kd。获得抗MAGE-A9单抗,MAGE-A9在肝细胞癌中的阳性表达率为21%(8/39),主要表达于胞浆,未见肿瘤异质性,统计学分析MAGE-A9的表达与患者年龄、性别、肿瘤大小和分化程度没有相关性。结论有相当部分肝癌患者的肿瘤表达MAGE-A9抗原,且其表达与患者年龄、性别、肿瘤大小和分化程度没有相关性,MAGE-A9可能成为肝癌特异性免疫治疗的靶点。展开更多
文摘Objective：To express the melanoma associated gene MAGE-A9 recombinant protein, obtain the anti-MAGE-A9 monoclonal antibody and to examine the expression of MAGE-A9 in hapatocellular carcinoma specimens. Methods：MAGE-A9 cDNA was cloned from human hepatocellular carcinoma tissue by using RT-PCR, and then subcloned into the plasmid pMD18-T. After sequencing, the MAGE-A9 was cloned into the prokaryotic expression vector pBAD/gⅢ to construct the recombinant expression vector pBAD/gⅢ - MAGE-A9, and was transformed into E. coli TOP10. The recombinant MAGE-A9 protein was expressed under induction of L-Arabinose, and was purified through Hitrap column. The anti-MAGE-A9 monoclonal antibody was generated. The expression of MAGE-A9 in hepatocellular carcinoma specimens was examined through ABC assay. Results：The cDNA sequence of the cloned MAGE-A9 gene was consistent with the reported sequence. By affinity column and SDS-PAGE, the purified MAGE-A9 fusion protein displayed a band of Mr 35,000, and subsequently the anti-MAGE-A9 monoclonal antibody was obtained. We found that MAGE-A9 expressed in the cytoplast of positive cells and MAGE-A9 antigen was detected in 8 cases out of 39 （21%） hepatocellular carcinoma specimens. Conclusion：MAGE-A9 antigen was expressed in a fair proportion of hepatocellular carcinoma specimens, these patients might be suitable candidates for immune involving antigen, encoded by the MAGE-A9 gene.
文摘目的:探讨人黑素瘤抗原-A(melanoma antigen-A,MAGE-A)对p53转录活性的影响。方法:选用p53缺失型人肺癌细胞系H1299,采用荧光素酶报告分析法、RT-PCR、Western印迹法、克隆形成实验和末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling,TUNEL)等方法研究MAGE-A4对p53转录活性的影响。结果:荧光素酶报告分析结果显示,转染p53基因(25ng)可以使p21WAF1启动子介导的荧光素酶表达增加(P<0.01);共转染恒定量(25ng)的p53基因和不同量的MAGE-A4基因(100、200和400ng)后,p21WAF1启动子介导的荧光素酶表达均明显高于单独转染p53基因时的表达量(P<0.01)。RT-PCR和Western印迹法检测结果也显示,转染p53基因可以使p21WAF1mRNA和蛋白表达水平增加(P<0.01),共转染MAGE-A4基因和p53基因后,p21WAF1mRNA和蛋白表达水平均明显高于单独转染p53基因时的表达水平(P<0.01)。克隆形成实验及TUNEL染色结果显示,转染p53基因可以使H1299细胞克隆形成数减少及凋亡细胞数增加(P<0.01),共转染MAGE-A4基因和p53基因以后,H1299细胞克隆形成数与单独转染p53基因组相比减少,而凋亡细胞数与单独转染p53基因组比较增加(P<0.01)。结论:MAGE-A4可以增强p53的转录活性及功能发挥。
文摘目的:探讨黑素瘤抗原(melanoma antigen gene,MAGE)-A11对雌激素受体(estrogen receptor,ER)介导的乳腺癌MCF-7细胞增殖的影响。方法:利用RT-PCR及Western blotting筛选出ER表达阳性的人乳腺癌MCF-7细胞作为模式细胞,采用基因转染、RT-PCR和Western blotting检测MAGE-A11对17β-雌二醇(17β-E)诱导的ER下游靶基因Efp表达的影响,采用免疫共沉淀法检测MCF-7细胞中MAGE-A11和ER蛋白的相互作用,采用MTT法和克隆形成实验分别检测MAGE-A11及17β-E处理对MCF-7细胞生存率和细胞克隆形成数的影响。结果:ER阳性MCF-7细胞经17β-E处理24 h后,下游靶基因Efp的mRNA(2.97±0.16 vs 1.71±0.09,P<0.05)和蛋白表达水平显著升高(2.65±0.12 vs 0.92±0.06,P<0.05);转染MAGE-A11的MCF-7细胞经17β-E 24 h处理后,其Efp的mRNA(4.01±0.19 vs 2.97±0.16,P<0.05)及蛋白表达(3.52±0.15 vs 2.65±0.12,P<0.05)更显著增加。免疫共沉淀结果显示,外源性MAGE-A11与ER之间存在相互作用。MCF-7细胞经17β-E处理后细胞增殖率显著增加[(152±6.7)%vs(108±4.8%),P<0.05],转染MAGE-A11的MCF-7细胞经17β-E处理后细胞增殖率更显著增加[(181±8.6)%vs(152±6.7)%,P<0.05];17β-E处理后MCF-7细胞克隆形成数显著增多[(77±5)vs(18±2)个,P<0.05],转染MAGE-A11的MCF-7细胞经17β-E处理后细胞的克隆形成数更显著增加[(125±6)vs(77±5)个,P<0.05)。结论:在ER阳性的乳腺癌MCF-7细胞中,MAGE-A11可通过与ER的相互作用增强ER介导的Efp的表达,从而促进细胞增殖,MAGE-A11可能成为ER阳性乳腺癌内分泌治疗耐药的靶基因。
文摘目的扩增和克隆人黑色素瘤抗原MAGE-A9(melanom a antigen A9)cDNA,构建原核表达载体,制备抗MAGE-A9单抗,观察其在肝细胞癌中的定位。方法从人肝癌组织提取总RNA,用RT-PCR从中扩增出MAGE-A9cDNA,插入载体pMD18-T中,测序正确后,构建重组表达载体pBAD/gI-II-MAGE-A9,转化大肠杆菌TOP10株进行表达。重组蛋白经L-Arabinose诱导表达纯化后,制备抗MAGE-A9单抗,免疫组化检测MAGE-A9在肝细胞癌中的表达和定位。结果获得AGE-A9cDNA,测序结果与GenBank一致。成功构建表达载体,表达可溶重组蛋白,SDS-PAGE分析其相对分子质量为35Kd。获得抗MAGE-A9单抗,MAGE-A9在肝细胞癌中的阳性表达率为21%(8/39),主要表达于胞浆,未见肿瘤异质性,统计学分析MAGE-A9的表达与患者年龄、性别、肿瘤大小和分化程度没有相关性。结论有相当部分肝癌患者的肿瘤表达MAGE-A9抗原,且其表达与患者年龄、性别、肿瘤大小和分化程度没有相关性,MAGE-A9可能成为肝癌特异性免疫治疗的靶点。
