Objective： To inwvetigate the expression of MAGE-A3 mRNA in tissue samples derived from lung cancers and to discuss the possibility of using MAGE-A3 antigens as a new peptide vaccine for inunotherapy for lung cancers...Objective： To inwvetigate the expression of MAGE-A3 mRNA in tissue samples derived from lung cancers and to discuss the possibility of using MAGE-A3 antigens as a new peptide vaccine for inunotherapy for lung cancers. Methods： Tumor tissue samples of lung cancers and paired non-tumor tissues of the lung were obtaimed from 31 lung cancer patients. Total RNA was extracted and cDNA was synthesized. Nested polymernse chain reaction amplification using MAGE-A3 specific primer was performed to detect the expression of MAGE-A3. The 10 clones of 5 samples of MAGE-A3 mRNA positive PCR products were DNA sequenced by using DNAs sequencer （PE-377）. Results： Of 31 lung cancers, 26 （83.9%） expressed MACE-A3 mRNA. The expression of MAGE-A3 gene was not detectable in the adjacent lung tissues. The DNA sequencing confirmed that the target gene fragment in all 5 samples of PCR products was MACE-A3 cDNA. Point nmtations occurred in 4 samples （8 clones） detected （C^2773→T^2773; G^2807→A^2807） resulting in alternation of amino acid residue in one position （E^143→K）. Conclusion： （1） The MAGE-A3 gene was expressed exclusively in tumor tissues of the patients with lung cancer in China. This tumor rejection antigen may have potential to be used as a new peptide vaccine for immunotherapy for lung eancers. （2） There are two point mutations of MAGE-A3 gene sequence in some Chinese lung cancer patients.展开更多
文摘目的:构建携带钙网蛋白(calreticulin,CRT)基因和黑素瘤抗原基因-A3(melanoma antigen gene-A3,MAGE-A3)的重组腺病毒载体Ad-CRT/MAGE-A3,观察其联合表柔比星对人乳腺癌细胞MDA-MB-231增殖及侵袭的抑制作用。方法:构建Ad-CRT/MAGE-A3载体,感染MDA-MB-231细胞后,荧光显微镜观察其最适感染复数(multiplicity of infection,MOI)。分表柔比星、Ad-GFP、Ad-CRT/MAGE-A3、表柔比星+Ad-GFP、表柔比星+Ad-CRT/MAGE-A3共5组,MTT法检测各组MDA-MB-231细胞的增殖,Transwell实验检测各组MDA-MB-231细胞的侵袭力。结果:成功构建重组腺病毒载体Ad-CRT/MAGE-A3,其感染MDA-MB-231细胞的最适MOI为100。与其他各组相比,应用Ad-CRT/MAGE-A3联合表柔比星能明显抑制MDA-MB-231细胞的增殖[(83.27±1.04)%vs(57.42±1.27)%,(43.26±0.95)%,(61.23±1.47)%,(55.38±1.62)%;P<0.05]和侵袭[(8.41±4.20)vs(14.62±5.33),(107.66±3.35),(100.60±4.42),(104.20±2.60);P<0.05]。结论:腺病毒载体Ad-CRT/MAGE-A3能增强表柔比星抑制乳腺癌细胞MDA-MB-231增殖及侵袭的能力。
基金This project was supported by the key project of Scientific Committee of Henan Province (No. 0124170232), the key project ofZhengzhou Scientific Committee (No. 04BA60ABYD18), and Tumor Biology Subproject of 211 project of zhengzhou Univevsity
文摘Objective： To inwvetigate the expression of MAGE-A3 mRNA in tissue samples derived from lung cancers and to discuss the possibility of using MAGE-A3 antigens as a new peptide vaccine for inunotherapy for lung cancers. Methods： Tumor tissue samples of lung cancers and paired non-tumor tissues of the lung were obtaimed from 31 lung cancer patients. Total RNA was extracted and cDNA was synthesized. Nested polymernse chain reaction amplification using MAGE-A3 specific primer was performed to detect the expression of MAGE-A3. The 10 clones of 5 samples of MAGE-A3 mRNA positive PCR products were DNA sequenced by using DNAs sequencer （PE-377）. Results： Of 31 lung cancers, 26 （83.9%） expressed MACE-A3 mRNA. The expression of MAGE-A3 gene was not detectable in the adjacent lung tissues. The DNA sequencing confirmed that the target gene fragment in all 5 samples of PCR products was MACE-A3 cDNA. Point nmtations occurred in 4 samples （8 clones） detected （C^2773→T^2773; G^2807→A^2807） resulting in alternation of amino acid residue in one position （E^143→K）. Conclusion： （1） The MAGE-A3 gene was expressed exclusively in tumor tissues of the patients with lung cancer in China. This tumor rejection antigen may have potential to be used as a new peptide vaccine for immunotherapy for lung eancers. （2） There are two point mutations of MAGE-A3 gene sequence in some Chinese lung cancer patients.
