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To study host response to CagA, human gastric cancer cell line AGS was infected with a Helicobacter pylori type I wild-type or isogenic cagA-negative mutant. Differentially expressed genes were identified using cDNA array technology. By Northern blotting, downregulation of focal adhesion kinase and upregulation of LIM kinase mRNA in the presence of CagA were clearly verified. Furthermore, upregulation of LIM kinase, macrophage inflammatory protein-2, c-myc, and bone morphogenetic protein-1 and downregulation of transcription factor Y-box binding protein-1 and focal adhesion kinase mRNA in response to H. pylori type I infection compared to the uninfected control could be shown by Northern blotting. Hence, these findings identified new targets for further functional studies on H. pylori-associated pathogenesis.

Gene Expression Profiling in AGS Cells Stimulated withHelicobacter pyloriIsogenic Strains (cagAPositive orcagANegative)