title: Exogenously administered and endogenously produced melatonin reduce hyperbaric oxygen-induced oxidative stress in rat lung.
abstract: Hyperbaric oxygen (HBO) is a widely used treatment modality in many diseases. A known side effect of HBO is the production of reactive oxygen species. Many antioxidants such as vitamins C and E, riboflavin and selenium have been used successfully to scavenge the reactive oxygen species caused by HBO administration. In this study, we aimed to see if melatonin, a newly discovered antioxidant, has a protective effect against the overproduction of reactive oxygen species produced by HBO in rat lung tissue. Sixty male Sprague-Dawley rats were divided into 5 groups as follows: control, daytime HBO (3 ATA, 120 min), daytime HBO plus melatonin (10 mg/kg), nighttime HBO and nighttime HBO (under light exposure). The MDA, SOD and CAT levels of daytime and nighttime HBO (under light exposure) increased significantly. This significance was not found in the daytime HBO plus melatonin and nighttime HBO groups when compared with the control. In this study, HBO caused oxidant stress, and melatonin decreased the levels of MDA, SOD and CAT. Moreover, endogenous melatonin was found to be a more effective antioxidant than exogenous 10 mg/kg melatonin.
authors.affiliation: Department of Physiology, Gulhane Military Medical Academy, GATA Fizyoloji AD. 06018 Etlik, Ankara, Turkey. ttopal@gata.edu.tr
authors.forename: Turgut
authors.initials: T
authors.lastname: Topal
authors.forename: Sukru
authors.initials: S
authors.lastname: Oter
authors.forename: Ahmet
authors.initials: A
authors.lastname: Korkmaz
authors.forename: Serdar
authors.initials: S
authors.lastname: Sadir
authors.forename: Gurkan
authors.initials: G
authors.lastname: Metinyurt
authors.forename: Elif T
authors.initials: ET
authors.lastname: Korkmazhan
authors.forename: Muhittin A
authors.initials: MA
authors.lastname: Serdar
authors.forename: Hayati
authors.initials: H
authors.lastname: Bilgic
authors.forename: Russel J
authors.initials: RJ
authors.lastname: Reiter
mesh_terms: D000818:Animals; D002374:Catalase / Q000378:metabolism; D016166:Free Radical Scavengers / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology; D006931:Hyperbaric Oxygenation / Q000009:adverse effects*; D008027:Light; D008168:Lung / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D008550:Melatonin / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D016166:Free Radical Scavengers; D017382:Reactive Oxygen Species; D008315:Malondialdehyde; D002374:Catalase; D013482:Superoxide Dismutase; D008550:Melatonin