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Role of Peyer's patches in the induction of Helicobacter pylori-induced gastritis.


ABSTRACT: Helicobacter pylori is a Gram-negative spiral bacterium that causes gastritis and peptic ulcer and has been implicated in the pathogenesis of gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma. Although Th1 immunity is involved in gastritis and the accumulation of H. pylori-specific CD4(+) T cells in the H. pylori-infected gastric mucosa in human patients, how T cells are primed with H. pylori antigens is unknown because no apparent lymphoid tissues are present in the stomach. We demonstrate here that Peyer's patches (PPs) in the small intestine play critical roles in H. pylori-induced gastritis; no gastritis is induced in H. pylori-infected mice lacking PPs. We also observed that the coccoid form of H. pylori is phagocytosed by dendritic cells in PPs. We propose that H. pylori converts to the coccoid form in the anaerobic small intestine and stimulates the host immune system through PPs.

SUBMITTER: Nagai S 

PROVIDER: S-EPMC1885612 | biostudies-literature | 2007 May

REPOSITORIES: biostudies-literature

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Role of Peyer's patches in the induction of Helicobacter pylori-induced gastritis.

Nagai Shigenori S   Mimuro Hitomi H   Yamada Taketo T   Baba Yukiko Y   Moro Kazuyo K   Nochi Tomonori T   Kiyono Hiroshi H   Suzuki Toshihiko T   Sasakawa Chihiro C   Koyasu Shigeo S  

Proceedings of the National Academy of Sciences of the United States of America 20070514 21


Helicobacter pylori is a Gram-negative spiral bacterium that causes gastritis and peptic ulcer and has been implicated in the pathogenesis of gastric adenocarcinoma and mucosa-associated lymphoid tissue lymphoma. Although Th1 immunity is involved in gastritis and the accumulation of H. pylori-specific CD4(+) T cells in the H. pylori-infected gastric mucosa in human patients, how T cells are primed with H. pylori antigens is unknown because no apparent lymphoid tissues are present in the stomach.  ...[more]

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