Résumé
Objective To establish two-dimensional electrophoresis profiles with high resolution and reproducibility from human gastric carcinoma and paired normal gastric mucosa tissues and to analyse the differential expression proteins between the two types of the tissues. Methods The total proteins of gastric carcinoma and paired normal gastric mucosa tissues were seperated by immobilized pH gradient-based two-dimensional gel electrophoresis (2-DE).After silver staining, the differential expression proteins were analyzed by using Imaging Master 2D analysis software. Results ⑴Average protein spots were 1049?67, 1097?73 in gastric carcinoma and paired normal gastric mucosa respectively,the matched spots were 835?48, 953?56 in both the two types of tissues respectively, and the average matching rate was 79.6%, 86.7% respectively. ⑵A total of 769?45 protein spots were matched between the electrophoretic maps of 5 gastric carcinoma and paired normal gastric mucosa tissues. The 81 differential protein spots were identified between the two types of the tissues. 17 protein spots were expressed only in the gastric carcinoma and 24 protein spots were expressed only in the normal gastric mucosa. The expression levels of 26 protein spots in the gastric carcinoma were higher than those in the normal gastric mucosa, and the expression levels of 14 protein spots in the gastric carcinoma were lower than those in the normal gastric mucosa. Conclusion In this study, the well-resolved,reproducible 2-DE patterns of gastric carcinoma and paired normal gastric mucosa tissues were established and some differential proteins between the two types of tissues were found. These data will be helpful to further screen specific biomarkers of gastric carcinoma.