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Helicobacter pylori and H2O2 increase AP endonuclease-1/redox factor-1 expression in human gastric epithelial cells.

Abstract：

BACKGROUND & AIMS:Helicobacter pylori infection causes inflammation, accumulation of reactive oxygen species, and oxidative DNA damage in the gastric mucosa. Apurinic/apyrimidinic endonuclease-1 (APE-1)/redox factor-1 (Ref-1) repairs damaged DNA and reductively activates transcription factors, including activator protein-1. Considering that H. pylori generate reactive oxygen species and that reactive oxygen species modulate APE-1/Ref-1 in other cell types, we examined the effect of H. pylori, oxidative stress, and antioxidants on APE-1/Ref-1 expression in human gastric epithelial cells. METHODS:Human gastric epithelial cell lines or cells isolated from mucosal biopsy samples were stimulated with H. pylori, Campylobacter jejuni, and/or H 2 O 2 in the presence or absence of antioxidants. APE-1/Ref-1 expression was assayed by Western blot or reverse-transcription polymerase chain reaction, and its cellular distribution was determined by using indirect conventional and confocal immunofluorescence. New protein synthesis was detected by [S 35 ]methionine labeling. APE-1/Ref-1 function was assessed by using a luciferase-linked reporter construct containing 3 activator protein 1 binding sites. RESULTS:APE-1/Ref-1 protein and messenger RNA were detected in resting gastric epithelial cells. APE-1/Ref-1 protein expression was increased after stimulation with H 2 O 2 or live cag pathogenicity island-bearing H. pylori, but not cag pathogenicity island-negative H. pylori or C. jejuni. H. pylori - or reactive oxygen species-mediated increases in APE-1/Ref-1 expression involved de novo protein synthesis that was inhibited by antioxidants. H. pylori or H 2 O 2 also induced nuclear accumulation of APE-1/Ref-1, and overexpression of APE-1/Ref-1 increased activator protein 1 binding activity. CONCLUSIONS:The data show that H. pylori or reactive oxygen species enhance APE-1/Ref-1 protein synthesis and nuclear accumulation in human gastric epithelial cells and implicate APE-1/Ref-1 in the modulation of the pathogenesis of H. pylori infection.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Ding SZ,O'Hara AM,Denning TL,Dirden-Kramer B,Mifflin RC,Reyes VE,Ryan KA,Elliott SN,Izumi T,Boldogh I,Mitra S,Ernst PB,Crowe SE

doi

10.1053/j.gastro.2004.06.017

keywords:

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

845-58

issue

eissn

0016-5085

issn

1528-0012

pii

S001650850401039X

journal_volume

127

pub_type

杂志文章

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Helicobacter pylori and H2O2 increase AP endonuclease-1/redox factor-1 expression in human gastric epithelial cells.