title: Effects of polaprezinc on lipid peroxidation, neutrophil accumulation, and TNF-alpha expression in rats with aspirin-induced gastric mucosal injury.
abstract: We examined the roles of lipid peroxidation, neutrophil accumulation, and inflammatory cytokines in the protective effect of polaprezinc against aspirin-induced gastric mucosal injury in rats. The intragastric administration of acidified aspirin induced hyperemia and hemorrhagic erosions in rat stomachs. The increase in the total gastric erosive area after aspirin administration was significantly inhibited in a dose-dependent manner by treatment with polaprezinc. The increases in thiobarbituric acid-reactive substances and tissue-associated myeloperoxidase activity 3 hr after aspirin administration were significantly inhibited by pretreatment with polaprezinc. The gastric concentration of TNF-alpha increased after aspirin administration, and the increase was also inhibited in a dose-dependent manner by treatment with polaprezinc. The peak expression of TNF-alpha mRNA 1 hr after aspirin administration was inhibited by 30 mg/kg of polaprezinc. Based on these data, the beneficial effects of polaprezinc on aspirin-induced gastric mucosal injury may be attributed to its antioxidative and antiinflammatory properties.
authors.affiliation: First Department of Medicine, Kyoto Prefectural University of Medicine, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Naito
authors.forename: T
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: N
authors.initials: N
authors.lastname: Yagi
authors.forename: K
authors.initials: K
authors.lastname: Matsuyama
authors.forename: N
authors.initials: N
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Seto
authors.forename: T
authors.initials: T
authors.lastname: Yoneta
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000009:adverse effects*; D000897:Anti-Ulcer Agents / Q000494:pharmacology*; D001241:Aspirin / Q000009:adverse effects*; D002336:Carnosine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D005753:Gastric Mucosa; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D009504:Neutrophils / Q000187:drug effects*; D009942:Organometallic Compounds / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013272:Stomach Diseases / Q000139:chemically induced* / Q000276:immunology / Q000378:metabolism / Q000517:prevention & control*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000187:drug effects*; D017967:Zinc Compounds
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000897:Anti-Ulcer Agents; D009942:Organometallic Compounds; D014409:Tumor Necrosis Factor-alpha; D017967:Zinc Compounds; C061957:polaprezinc; D002336:Carnosine; D001241:Aspirin