Oxidative stress is linked to carcinogenesis due to its ability to damage DNA. The human gastric pathogen Helicobacter pylori exerts much of its pathogenicity by inducing apoptosis and DNA damage in host gastric epithelial cells. Polyamines are abundant in epithelial cells, and when oxidized by the inducible spermine oxidase SMO(PAOh1) H 2 O 2 is generated. Here, we report that H. pylori up-regulates mRNA expression, promoter activity, and enzyme activity of SMO (PAOh1)

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