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Reactive oxygen species activity, mucosal lipoperoxidation and glutathione in Helicobacter pylori-infected gastric

H K Jung1, K E Lee, S H Chu

  • 1Department of Internal Medicine, Ewha Women's University, College of Medicine, Seoul, Korea.

Journal of Gastroenterology and Hepatology
|February 20, 2002
PubMed
Abstract

Insights

Helicobacter pylori infection increases reactive oxygen species and membrane damage in gastric mucosa. This leads to lower levels of protective antioxidants, contributing to gastroduodenal diseases.

Area of Science:

  • Gastroenterology
  • Microbiology
  • Pathophysiology

Background:

  • Helicobacter pylori is a major pathogen in gastroduodenal diseases.
  • The precise mechanisms of H. pylori's action remain incompletely understood.
  • This study investigates oxidative stress and mucosal damage in H. pylori infection.

Purpose of the Study:

  • To assess reactive oxygen species (ROS) activity in H. pylori-infected gastric mucosa.
  • To evaluate the extent of mucosal damage associated with H. pylori infection.
  • To determine the levels of antioxidants in H. pylori-infected gastric tissue.

Main Methods:

  • Gastric biopsy specimens were collected from 308 patients undergoing endoscopy.
  • Luminol-enhanced chemiluminescence was used to measure ROS activity.
  • Thiobarbituric acid-reactive substance (TBARS) assay and mucosal glutathione levels assessed lipid peroxidation and antioxidant status, respectively.

Main Results:

  • H. pylori-positive gastric mucosa showed significantly higher chemiluminescence and TBARS levels compared to H. pylori-negative mucosa.
  • Glutathione levels were significantly lower in H. pylori-positive gastric mucosa.
  • No significant differences in measured parameters were observed among macroscopic findings within H. pylori-positive or -negative groups.

Conclusions:

  • H. pylori infection contributes to gastrointestinal pathology via excessive ROS production.
  • The infection causes significant membrane damage in the gastric mucosa.
  • Depletion of gastric antioxidants is a key consequence of H. pylori infection.

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