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Suganuma, Masami,Kuzuhara, Takashi,Yamaguchi, Kensei,Fujiki, Hirota Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.1
Helicobacter pylori is the definitive carcinogen for stomach cancer and is known to induce proinflammatory cytokines, such as tumor necrosis factor-$\alpha$ (TNF-$\alpha$) and interleukin-1(IL-1) in the stomach. Based on our findings that TNF-$\alpha$ is an endogenous tumor promoter, we identified the TNF-$\alpha$ inducing protein (Tip$\alpha$) gene family, and confirmed Tip$\alpha$ and HP-MP1 as new carcinogenic proteins of H. pylori. Tip$\alpha$ protein is unique to H. pylori, and this paper shows the strong tumor promoting activity of Tip$\alpha$ gene family, in cooperation with Ras protein and its mechanisms of action in relation to NF-${\kappa}B$ activation, and discusses the carcinogenic role of Tip$\alpha$ in stomach cancer. Our recent finding showing that penicillin-binding proteins of other bacteria are weak homologues of Tip$\alpha$ is also discussed.