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Deficiency in OGG1 Protects against Inflammation and Mutagenic Effects Associated with H. pylori Infection in Mouse
Author(s) -
Touati Eliette,
Michel Valérie,
Thiberge JeanMichel,
Avé Patrick,
Huerre Michel,
Bourgade Franck,
Klungland Arne,
Labigne Agnès
Publication year - 2006
Publication title -
helicobacter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.206
H-Index - 79
eISSN - 1523-5378
pISSN - 1083-4389
DOI - 10.1111/j.1523-5378.2006.00442.x
Subject(s) - inflammation , dna glycosylase , dna damage , helicobacter pylori , gastritis , genotoxicity , immune system , context (archaeology) , biology , immunology , stomach , cancer , oxidative stress , medicine , dna , endocrinology , genetics , toxicity , biochemistry , paleontology
Background: Helicobacter pylori infection is associated with gastric cancer. Study with the Big Blue mouse model has reported a mutagenic effect associated with the H. pylori infection, as a result in part of oxidative DNA damage. The present work investigates the consequences of a deficiency in the OGG1 DNA glycosylase, responsible for the excision of 8‐oxo guanine, on the inflammatory and genotoxic host response to the infection. Materials and Methods: Big Blue Ogg1 –/– C57BL/6 mice were orally inoculated with H. pylori strain SS1 or vehicle only, and sacrificed after 1, 3, or 6 months. The serologic response, histologic lesions, mutant frequency, and spectra of mutations were assessed in the stomach and compared to what observed in the wild‐type (Wt) context. Results: Inflammatory lesions induced in the gastric mucosa of H. pylori ‐infected mice, corresponding to a moderate gastritis, were less severe in Ogg1 –/– than in Wt Big Blue mice. Analysis of antimicrobial humoral immunity exhibited a lower IgG2a serum level (Th1 response) after 6 months of infection in Ogg1 –/– than in the Wt mice. In these conditions, the H. pylori ‐SS1 infection in the Ogg1 –/– mice did not induce a mutagenic effect at the gastric epithelial cells level, either after 3 or 6 months. Conclusions: The inactivation of the OGG1 DNA glycosylase in mouse leads to less severe inflammatory lesions and abolished the mutagenic effect at the gastric epithelial cells level, induced by the H. pylori infection. These data suggest for the OGG1deficiency a protective role against inflammation and genotoxicity associated to the H. pylori infection.