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The genome-wide expression profile of gastric epithelial cells infected by naturally occurring cagA isogenic strains of Helicobacter pylori

 Sung-Hwa Sohn  ;  Yong-Chan Lee 
 Environmental Toxicology and Pharmacology, Vol.32(3) : 382-389, 2011 
Journal Title
 Environmental Toxicology and Pharmacology 
Issue Date
Helicobacter pylori (H. pylori) is associated with the development of gastric adenocarcinoma and lymphoma. However, the mechanisms through which H. pylori induces gastric mucosal lesions are not well defined. This study was conducted to evaluate the effect of the oncoprotein CagA on gastric cancer cells using whole-genome expression arrays. Human gastric epithelial (AGS) cells were incubated with CagA-positive H. pylori strains (147C (phosphorylated CagA) or 147A (dephosphorylated CagA)), and total protein and RNA were collected. The effects of phosphorylated and unphosphorylated CagA on AGS cells were then evaluated using Western blotting and microarray analysis. The expression levels of the genome profiles of AGS cells infected with 147A were compared with those of AGS cells infected with 147C. The expression profiles of the differentially expressed genes were grouped, and their expression patterns were validated via quantitative real-time PCR. Up- and down-regulated genes mainly included epithelial mesenchymal transition (EMT)-related genes. The results of the microarray analysis revealed that phosphorylated and unphosphorylated CagA may affect EMT in part through gene expression. This suggests that the intracellularly translocated CagA may be involved in EMT, resulting in differential expression of genes independent on the phosphorylation status of CagA.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Medical Research Center (임상의학연구센터)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실)
Yonsei Authors
손성화(Sohn, Sung Hwa) ; 이용찬(Lee, Yong Chan)
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