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KMID : 0614620160680040186
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Korean Journal of Gastroenterology
2016 Volume.68 No. 4 p.186 ~ p.194
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Role of Inhibitory Transforming Growth Factor-β Signal Smad7 in Helicobacter pylori- associated Gastric Damage
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Lee Ho-Jae
Park Jong-Min
Hahm Ki-Baik
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Abstract
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Background/Aims: Transforming growth factor-beta (TGF-β) is a cytokine implicated in the susceptibility, development, and progression 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-transfected 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.
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KEYWORD
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Helicobacter pylori, Transforming growth factor beta, Smad7, Gastritis
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