[Antioxidant defense capabilities of gastric mucosa induced by water immersion restraint stress of rat].
Lipid peroxidation mediated by free radicals is believed to be one of the important causes of membrane destruction and cell damage. Lipid peroxidation in gastric mucosa induced by the stress is also suggested to cause gastric lesions. However very little is known about the antioxidant mechanisms in gastric mucosa, which is thought to be accelerated by the stress as an adaptive response. So we investigated lipid peroxide (LPO) and the production of lipid hydroperoxides by 1,5-lipoxygenase, which might reflect the antioxidant capabilities in gastric mucosa. The analysis of lipid hydroperoxide was done by high performance liquid chromatography (HPLC) using chemiluminescence which we have established. The production of lipid hydroperoxide by lipoxygenase was done by the condition of Low-Ethanol method. The water immersion restraint stress induced significant rise of gastric mucosal LPO assayed by the thiobarbituric acid-reactive substances method but lipid hydroperoxide was not detected by HPLC. The production of lipid hydroperoxide by lipoxygenase was clearly found in the gastric mucosa before the stress but the stress of 2 or 4 hours depressed the production of lipid hydroperoxides significantly. These findings showed that the stress induced the increase of antioxidant capabilities in the gastric mucosa as an adaptive reaction and the lipid hydroperoxide induced by the stress might be scavenged quickly.
Ohisa
Y
Y
Department of Clinical & Laboratory Medicine, Tohoku University School of Medicine, Sendai.
Kawamura
T
T
Mizonobe
K
K
Funato
T
T
Sasaki
T
T
D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D005753:Gastric Mucosa / Q000378:metabolism*; D007101:Immersion; D008054:Lipid Peroxides / Q000378:metabolism; D008084:Lipoxygenase / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D012149:Restraint, Physical; D013312:Stress, Physiological / Q000378:metabolism*
D000975:Antioxidants; D008054:Lipid Peroxides; D008084:Lipoxygenase