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Hydroxyl radical formation in human gastric juice
S Nalini1, B S Ramakrishna, A Mohanty
1Wellcome Research Laboratory, Department of Gastrointestinal Sciences, Christian Medical College Hospital, Vellore, India.
Journal of Gastroenterology and Hepatology
|September 1, 1992
Summary
Human gastric juice naturally produces potent hydroxyl radicals, implicated in gastroduodenal damage. This study found no significant difference in production between healthy individuals and duodenal ulcer patients, suggesting a focus on mucosal defenses.
Area of Science:
- Biochemistry
- Gastroenterology
- Free Radical Chemistry
Background:
- Hydroxyl radicals, potent oxygen-derived free radicals, are linked to gastroduodenal mucosal damage.
- Previous research has explored free radical generation in various body fluids.
Purpose of the Study:
- To investigate hydroxyl radical generation in normal human gastric juice.
- To compare hydroxyl radical production in individuals with normal gastroduodenal mucosa versus those with chronic duodenal ulcer.
Main Methods:
- Quantified hydroxyl radical production by measuring formaldehyde formation from dimethylsulfoxide (DMSO).
- Assayed gastric juice for endogenous catalysts: hydrogen peroxide (H2O2), ascorbate, and iron.
- Compared catalyst concentrations and radical production between healthy subjects and duodenal ulcer patients.
Main Results:
- Human gastric juice spontaneously generates hydroxyl radicals without added catalysts.
- Endogenous catalysts (H2O2, ascorbate, iron) are present in gastric juice.
- No significant difference in hydroxyl radical production was observed between normal subjects and duodenal ulcer patients, although H2O2 levels were slightly higher in the latter group.
Conclusions:
- This is the first report of hydroxyl radical production in normal human gastric juice.
- The findings suggest that hydroxyl radical generation is not significantly enhanced in duodenal ulcer disease.
- Future research should investigate mucosal antioxidant defenses as a potential factor in duodenal ulcer pathogenesis.