Αρχειοθήκη ιστολογίου

Αλέξανδρος Γ. Σφακιανάκης
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5
Άγιος Νικόλαος Κρήτη 72100
2841026182
6032607174

Παρασκευή 9 Νοεμβρίου 2018

Recruitment of CCR6+ Foxp3+ regulatory gastric infiltrating lymphocytes in Helicobacter pylori gastritis

Abstract

Helicobacter pylori (H. pylori) infection is associated with an inflammatory response in the gastric mucosa, leading to chronic gastritis, peptic ulcers, and gastric cancer. Increased T‐cell infiltration is found at sites of H. pylori infection. The CCR6+ subset of CD4+ regulatory T cells (Tregs), a newly characterized subset of Tregs, has been reported to contribute to local immune inhibition. However, whether CCR6+ Tregs are present in H. pylori gastritis, and what their relationship is to disease prognosis, remains to be elucidated. In this study, gastric infiltrating lymphocytes were isolated from endoscopic biopsy specimens of H. pylori gastritis patients and analyzed. We found that in gastric infiltrating lymphocytes, CCR6CD4CD25high Tregs, which express high levels of CD45RO, are positively associated with more severe inflammation in gastric mucosa during H. pylori infection. Furthermore, the frequency of CCR6+ Tregs in gastric infiltrating lymphocytes, but not CCR6 Tregs, is significantly increased in inflamed gastric tissues, which is inversely correlated with significantly lower expression of IFN‐γCD8+ T cells. We also found that the frequency of CCR6+ Tregs is positively correlated with the frequency of CD4IFN‐γ+ T cells. In addition, the frequency of CCR6+ Tregs, but not that of CCR6 Tregs, is significantly correlated with increased inflammation in H. pylori gastritis. This study demonstrates that immunosuppression in H. pylori gastritis might be related to the activity of CCR6+ Tregs, which could influence disease prognosis.



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