Heficobacterpylori infection is related to the development of gastric diseases. Our previous studies showed that high thioredoxin-1 （Trxl） expression in H. pylori can promote gastric carcinogenesis. To explore the u...Heficobacterpylori infection is related to the development of gastric diseases. Our previous studies showed that high thioredoxin-1 （Trxl） expression in H. pylori can promote gastric carcinogenesis. To explore the underlying molecular mechanisms, we performed an isobaric tags for relative and absolute quantitation （iTRAQ）-based quantitative proteomic analysis of stomach tissues from Mongolian gerbil infected with H. pylori expressing high and low Trxl Differences in the profiles of the expressed proteins were analyzed by bioinformatics and verified using Western blot analysis. We found three candidate proteins, 14-3-3α/β, glutathione-S-transferase （GST）, and heat shock protein 70 （HSP70）, in high Trxl tissues compared with low Trxl tissues and concluded that cellular stress and redox activity- related proteins were involved in the pathogenesis of gastric cancer associated with H. pylori Trxl.展开更多
Objective： To investigate the pathogenic properties of Helicobacterpylori by comparing the proteome map of H. pylori clinical strains. Methods： Two wild-type H. pylori strains, YN8 （isolated from biopsy tissue of a...Objective： To investigate the pathogenic properties of Helicobacterpylori by comparing the proteome map of H. pylori clinical strains. Methods： Two wild-type H. pylori strains, YN8 （isolated from biopsy tissue of a gastric cancer patient） and YN14 （isolated from biopsy tissue of a gastritis and duodenal ulcer patient）, were used. Proteomic analysis, using a pH range of 3-10 and 5-8, was performed. The individual proteins were identified by quadrupole time-of-flight （Q-TOF） mass spectrometer and protein database search. Results： Variation in spot patterns directed towards differential protein expression levels was observed between the strains. The gel revealed prominent proteins with several protein ＂families＂. The comparison of protein expressions of the two strains reveals a high variability. Differentially present or absent spots were observed. Nine differentially expressed protein spots identified by Q-TOF included adenosine triphosphate （ATP）-binding protein, disulfide oxidoreductase B （DsbB）-Iike protein, N utilization substance A （NusA）, ATP-dependent protease binding subunit/heat shock protein, hydantoin utilization protein A, seryl-tRNA synthetase, molybdenum ABC transporter ModD, and hypothetical proteins. Conclusions： This study suggests that H. pylori strains express/repress protein variation, not only in terms of the virulence proteins, but also in terms of physiological proteins, when they infect a human host. The difference of protein expression levels between H. pylori strains isolated from gastric cancer and gastritis may be the initiator of inflammation, and result in the different clinical presentation. In this preliminary study, we report seven differential proteins between strains, with molecule weights from approximately 10 kDa to approximately 40 kDa. Further studies are needed to investigate those proteins and their function associated with H. pylori colonization and adaptation to host environment stress.展开更多
基金Project supported by the Key Laboratory for Helicobacter pylori Infection and Upper Gastrointestinal Diseases,Beijing Key Laboratory(No.BZ0371)the National Natural Science Foundation of China(Nos.81700496,81270475,and 30770980)
文摘Heficobacterpylori infection is related to the development of gastric diseases. Our previous studies showed that high thioredoxin-1 （Trxl） expression in H. pylori can promote gastric carcinogenesis. To explore the underlying molecular mechanisms, we performed an isobaric tags for relative and absolute quantitation （iTRAQ）-based quantitative proteomic analysis of stomach tissues from Mongolian gerbil infected with H. pylori expressing high and low Trxl Differences in the profiles of the expressed proteins were analyzed by bioinformatics and verified using Western blot analysis. We found three candidate proteins, 14-3-3α/β, glutathione-S-transferase （GST）, and heat shock protein 70 （HSP70）, in high Trxl tissues compared with low Trxl tissues and concluded that cellular stress and redox activity- related proteins were involved in the pathogenesis of gastric cancer associated with H. pylori Trxl.
基金supported by the National Natural Science Foundation of China (No. 30770980)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (2008)
文摘Objective： To investigate the pathogenic properties of Helicobacterpylori by comparing the proteome map of H. pylori clinical strains. Methods： Two wild-type H. pylori strains, YN8 （isolated from biopsy tissue of a gastric cancer patient） and YN14 （isolated from biopsy tissue of a gastritis and duodenal ulcer patient）, were used. Proteomic analysis, using a pH range of 3-10 and 5-8, was performed. The individual proteins were identified by quadrupole time-of-flight （Q-TOF） mass spectrometer and protein database search. Results： Variation in spot patterns directed towards differential protein expression levels was observed between the strains. The gel revealed prominent proteins with several protein ＂families＂. The comparison of protein expressions of the two strains reveals a high variability. Differentially present or absent spots were observed. Nine differentially expressed protein spots identified by Q-TOF included adenosine triphosphate （ATP）-binding protein, disulfide oxidoreductase B （DsbB）-Iike protein, N utilization substance A （NusA）, ATP-dependent protease binding subunit/heat shock protein, hydantoin utilization protein A, seryl-tRNA synthetase, molybdenum ABC transporter ModD, and hypothetical proteins. Conclusions： This study suggests that H. pylori strains express/repress protein variation, not only in terms of the virulence proteins, but also in terms of physiological proteins, when they infect a human host. The difference of protein expression levels between H. pylori strains isolated from gastric cancer and gastritis may be the initiator of inflammation, and result in the different clinical presentation. In this preliminary study, we report seven differential proteins between strains, with molecule weights from approximately 10 kDa to approximately 40 kDa. Further studies are needed to investigate those proteins and their function associated with H. pylori colonization and adaptation to host environment stress.
