헬리코박터 파일로리 감염 연관 위질환 발생시 형질전환인자-베타 저해신호로서 Smad7의 역할 = Role of Inhibitory Transforming Growth Factor-β Signal Smad7 in Helicobacter pylori-associated Gastric Damage

다국어 초록 (Multilingual Abstract)

Background/Aims: Transforming growth factor-beta (TGF-β) is a cytokine implicated in the susceptibility, development, and pro-gression of gastrointestinal cancer and certain other neoplasms. In the later stages of cancer, TGF-β not only acts as a bystander of host-immune response, but also contributes to cell growth, invasion, and metastasis. In the current study, we generated gastric mucosal cells that stably express Smad7, and explored the Helicobacter pylori-associated biological changes between mock-transfected and Smad7-transfected RGM1 cells. Methods: RGM1 cells stably transfected with Smad7 were infected with H. pylori, and molecular changes in apoptotic markers and inflammatory mediators were examined. Several candidate genes were explored in Smad7-overexpressing cells after H. pylori infection. Results: Overexpression of Smad7 in RGM1 cells significantly increased the H. pylori-induced cytotoxicity compared to mock-trans-fected cells. Exaggerated increases in inflammatory mediators, cyclooxygenase 2, inducible NO synthase, and augmented apoptosis were noted in Smad7-overexpressing cells, whereas mitigated heme oxygenase 1 was noted in Smad7- overexpressing cells. These phenomena were reversed in cells transfected with Smad7 siRNA. Conclusions: These data suggest that inhibition of Smad7 is a possible target for mitigating H. pylori-associated inflammation. (Korean J Gastroenterol 2016;68:186-194)

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