PMID: 9438562Jan 23, 1998Paper

Neutrophils, lipid peroxidation, and nitric oxide in gastric reperfusion injury in rats

Free Radical Biology & Medicine
Y NaitoM Kondo

Abstract

Nitric oxide (NO) modulation of ischemia-reperfusion injury was investigated by measuring lipid peroxide and neutrophil accumulation in rat stomachs treated with NG-nitro-L-arginine (L-NNA), a specific NO synthase inhibitor. Ischemia-reperfusion injury was induced in the rat stomach. Treatment with L-NNA for 3 days at a dose of 3 mg/kg/day significantly enhanced this injury. This enhancement was reversed by the simultaneous administration of L-arginine at a dose of 30 mg/kg/day. Both thiobarbituric acid (TBA)-reactive substances, an index of lipid peroxidation, and myeloperoxidase (MPO) activity, an index of tissue-associated neutrophil accumulation, were increased in the gastric mucosa after ischemia-reperfusion. L-NNA treatment enhanced these increases in TBA-reactive substances and MPO activity. The increase in the area of gastric erosions correlated closely with accumulation of TBA-reactive substances as well as the increase in MPO activity. Enhancement of ischemia-reperfusion injury by L-NNA treatment was inhibited by injection with anti-neutrophil antibody, anti-platelet activating factor (PAF) antagonist, and anti-leukotriene B4 (LTB4) receptor antagonist. In addition, the increase in TBA-reactive substances and MPO acti...Continue Reading

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