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H. pylori attenuates TNBS-induced colitis via increasing mucosal Th2 cells in mice.
Oncotarget 2017 May 19
There is an epidemiological inverse relationship between Helicobacter pylori (H. pylori) infection and Crohn's disease (CD). However, whether H. pylori plays a protective role against CD remains unclear. Since 2, 4, 6-trinitrobenzene sulfonic acid (TNBS)-induced colitis is thought to resemble CD, we investigated whether H. pylori can attenuate TNBS-induced colitis in mice. Here we show that H. pylori can attenuate the severity of TNBS-induced colitis. In addition, H. pylori not only down-regulates Th17 and Th1 cytokine expression, but can up-regulate Th2 cytokine expression and increase the Th2:Th17 ratio of CD4+ T in the colonic mucosa of TNBS-induced colitis. Our results indicate that H. pylori attenuates TNBS-induced colitis mainly through increasing Th2 cells in murine colonic mucosa. Our finding offers a novel view on the role of H. pylori in regulating gastrointestinal immunity, and may open a new avenue for development of therapeutic strategies in CD by making use of asymptomatic H. pylori colonization.
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