BACKGROUND: Infection with Helicobacter pylori is believed to be associated with generation of reactive oxygen molecules which leads to oxidative stress in the gastric mucosa; but the relation between oxidative stress and gastrointestinal mucosal damage has not been documented. AIM: To look for evidence of oxidative stress and lipid peroxidation in the gastric mucosa in H. pylori-associated peptic ulcer. METHODS: 34 duodenal ulcer (DU) patients with H. pylori infection, 14 DU patients without H. pylori infection and 10 healthy subjects without H. pylori infection were studied. H. pylori infection was diagnosed by histology and rapid urease test on endoscopic biopsies from the gastric body and antrum. Reduced glutathione (GSH) and malondialdehyde (MDA) content were measured in biopsies taken from the gastric antrum. Statistical analysis was done using Student's t test. RESULTS: Tissue levels of GSH were significantly lower (91.7 [35.4] nmole/100 mg versus 147.3 [41.2] nmole/100 mg; p < 0.001) and MDA higher (163.0 [83.4] nmole/100 mg versus 109.2 [51.3] nmole/100 mg; p < 0.01) in patients with DU associated with H. pylori infection as compared to those without H. pylori infection. GSH levels were significantly lower and MDA levels higher in DU patients with or without H. pylori infection as compared to control subjects. Serum MDA levels in DU patients with H. pylori infection were also significantly higher than in patients without H. pylori infection. CONCLUSION: Depletion of gastric mucosal glutathione in H. pylori-infected DU patients may be due to failure of the antioxidant defense system. Failure of the glutathione-dependent defense system results in accumulation of free radicals which can initiate membrane damage by lipid peroxidation.
BACKGROUND:Infection with Helicobacter pylori is believed to be associated with generation of reactive oxygen molecules which leads to oxidative stress in the gastric mucosa; but the relation between oxidative stress and gastrointestinal mucosal damage has not been documented. AIM: To look for evidence of oxidative stress and lipid peroxidation in the gastric mucosa in H. pylori-associated peptic ulcer. METHODS: 34 duodenal ulcer (DU) patients with H. pyloriinfection, 14 DU patients without H. pyloriinfection and 10 healthy subjects without H. pyloriinfection were studied. H. pyloriinfection was diagnosed by histology and rapid urease test on endoscopic biopsies from the gastric body and antrum. Reduced glutathione (GSH) and malondialdehyde (MDA) content were measured in biopsies taken from the gastric antrum. Statistical analysis was done using Student's t test. RESULTS: Tissue levels of GSH were significantly lower (91.7 [35.4] nmole/100 mg versus 147.3 [41.2] nmole/100 mg; p < 0.001) and MDA higher (163.0 [83.4] nmole/100 mg versus 109.2 [51.3] nmole/100 mg; p < 0.01) in patients with DU associated with H. pyloriinfection as compared to those without H. pyloriinfection. GSH levels were significantly lower and MDA levels higher in DU patients with or without H. pyloriinfection as compared to control subjects. Serum MDA levels in DU patients with H. pyloriinfection were also significantly higher than in patients without H. pyloriinfection. CONCLUSION: Depletion of gastric mucosalglutathione in H. pylori-infected DU patients may be due to failure of the antioxidant defense system. Failure of the glutathione-dependent defense system results in accumulation of free radicals which can initiate membrane damage by lipid peroxidation.
Authors: G Vijayan; R C Sundaram; Zachariah Bobby; Abdoul Hamide; N Selvaraj; N Rattina Dasse Journal: World J Gastroenterol Date: 2007-02-07 Impact factor: 5.742
Authors: Qu Bao-Ge; Wang Hui; Jia Yi-Guo; Su Ji-Liang; Wang Zhong-Dong; Wang Ya-Fei; Han Xing-Hai; Liu Yuan-Xun; Pan Jin-Dun; Ren Guang-Ying Journal: Sci Rep Date: 2017-02-21 Impact factor: 4.379