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。
