title: Protective effect of melatonin against multistress condition induced lipid peroxidation via measurement of gastric mucosal lesion and plasma malondialdehyde levels in rats.
abstract: OBJECTIVE
  To study the protective effect of a natural antioxidant, melatonin, against multistress condition induced lipid peroxidation via determination of gastric damage and plasma malondialdehyde (MDA) level by high performance liquid chromatography in rats.
  
  
  METHODS
  We compared indomethacin-induced gastric damage and MDA plasma level in three groups of rats: unoperated, bile duct ligated and sham-operated and evaluated the role of the melatonin on gastric damage and plasma MDA level. Indomethacin and melatonin were injected intraperitoneally in doses of 50 mg/kg and 20 mg/kg, respectively. Animals were killed 4 h after indomethacin injection.
  
  
  RESULTS
  Indomethacin induced more severe gastric damage and plasma MDA level in bile duct ligated animals was significantly higher (3.1 +/- 0.04 micromol/L) than sham (2.8 +/- 0.04 micromol/L) and unoperated animals (1.4 +/- 0.08 micromol/L). Pretreatment with melatonin reduced indomethacin-induced gastric damage and plasma MDA level.
  
  
  CONCLUSIONS
  Considering the results of this study, we suggest that in multistress conditions the intensity of gastric damage and the plasma MDA level are great and melatonin reduces the negative effect of lipid peroxidation and cell damage by oxidative stress in multistress conditions due to its antioxidizing activity.
authors.affiliation: Faculty of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran.
authors.forename: V
authors.initials: V
authors.lastname: Kiarostami
authors.forename: L
authors.initials: L
authors.lastname: Samini
authors.forename: M
authors.initials: M
authors.lastname: Ghazi-Khansari
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000633:toxicity; D000975:Antioxidants / Q000494:pharmacology; D001652:Bile Ducts / Q000601:surgery; D005753:Gastric Mucosa / Q000187:drug effects* / Q000473:pathology; D007213:Indomethacin / Q000633:toxicity; D008026:Ligation; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D008550:Melatonin / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013312:Stress, Physiological / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000975:Antioxidants; D008315:Malondialdehyde; D008550:Melatonin; D007213:Indomethacin