Song YY, Zhao F, Xiao D, Ma GY, Meng FL, He LH, Zhang JZ. Sequential proteomic characteristics of AGS cells co-cultured with
H. pylori strain.
Shijie Huaren Xiaohua Zazhi 2008;
16:1260-1265. [DOI:
10.11569/wcjd.v16.i12.1260]
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Abstract
AIM: To analyze the differential expression of proteome in human gastric adenocarcinoma epithelial AGS cells co-cultured with H. pylori.
METHODS: The samples of AGS cells co-cultured with H. pylori 26695 strain at three time-points (0.5, 2 and 4 h) were collected and separated by 2-dimensional polyacrylamide gel electrophoresis (2-DE) technique and computer-assisted image analysis was used to analyze the differential proteomic expression. The significantly differentially expressed proteins were recognized and identified with the 4700 proteomics discovery system.
RESULTS: There were 66 protein spots that were significantly differentially expressed at different time-points, 34 (corresponding to 16 kinds of proteins) of which were identified with matrix-assisted laser desorption/ionization time-of-flight/time-of-flight (MALDI-TOF-TOF). At 2-h time-point, 8 kinds of proteins were up-regulated obviously, of which 2 originated from the cells and 6 from H. pylori. At the 4-h time-point, 4 kinds of cell-originated proteins were down-regulated, and 4 kinds of new proteins were observed. Succinate dehydrogenase iron-sulfur subunit, HpaA, HSP 60 and peroxiredoxin were up-regulated at the early stage of co-infection. However, at the late stage of co-infection, two cell-originated proteins (cyclophilin A, nascent-polypeptide-associated complex alpha polypeptide) and two H. pylori-originated proteins (urease, non-heme iron protein) were found to express.
CONCLUSION: During the interaction between AGS cells and H. pylori, the expression of proteins is associated with adhesion change in the early stage, followed by a favorable alteration in the survival and proliferation of H. pylori as well as immunologic escape and pathological erosion.
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