title: Cellular stress-related protein expression in Helicobacter pylori-infected gastric epithelial AGS cells.
abstract: Helicobacter pylori infection leads to gastroduodenal inflammation, peptic ulceration, and gastric carcinoma. Moreover, H. pylori may induce disease-specific protein expression in gastric epithelial cells. The present study was aimed at determining differentially expressed proteins in H. pylori-infected gastric epithelial AGS cells. AGS cells were treated with H. pylori at a bacterium/cell ratio of 300:1 for 12 h. Altered protein patterns as separated by two-dimensional electrophoresis using pH gradients of 4-7 were conclusively identified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) analysis of the peptide digests. Four differentially expressed proteins, whose expression levels were increased by more than two-fold in H. pylori-infected cells, were analyzed. These proteins (14-3-3 protein alpha/beta, cullin homolog 3, alpha-enolase, ezrin) are known to be related to cell proliferation, cell adhesion, and carcinogenesis, and may be mediated by cellular stress, such as reactive oxygen species. In conclusion, the identification of these differentially expressed proteins provide valuable information for the understanding of the pathophysiologic mechanisms of H. pylori-induced gastric diseases, and may be useful as prognostic indices of H. pylori-related gastric disorders.
authors.affiliation: Department of Pharmacology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, South Korea.
authors.forename: Joo Weon
authors.initials: JW
authors.lastname: Lim
authors.forename: Hyeyoung
authors.initials: H
authors.lastname: Kim
authors.forename: Jung Mogg
authors.initials: JM
authors.lastname: Kim
authors.forename: Joo Sung
authors.initials: JS
authors.lastname: Kim
authors.forename: Hyun Chae
authors.initials: HC
authors.lastname: Jung
authors.forename: Kyung Hwan
authors.initials: KH
authors.lastname: Kim
mesh_terms: D045744:Cell Line, Tumor; D015180:Electrophoresis, Gel, Two-Dimensional; D004847:Epithelial Cells / Q000378:metabolism / Q000382:microbiology*; D005753:Gastric Mucosa / Q000378:metabolism / Q000382:microbiology*; D016481:Helicobacter Infections / Q000473:pathology*; D016480:Helicobacter pylori; D006801:Humans; D018384:Oxidative Stress; D011506:Proteins / Q000032:analysis / Q000235:genetics; D040901:Proteomics / Q000379:methods; D017382:Reactive Oxygen Species; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D015854:Up-Regulation / Q000502:physiology*
chemical_list: D011506:Proteins; D017382:Reactive Oxygen Species