title: Effects of ozone oxidative preconditioning on TNF-alpha release and antioxidant-prooxidant intracellular balance in mice during endotoxic shock.
abstract: Ozone oxidative preconditioning is a prophylactic approach, which favors the antioxidant-prooxidant balance for preservation of cell redox state by the increase of antioxidant endogenous systems in both in vivo and in vitro experimental models. Our aim is to analyze the effect of ozone oxidative preconditioning on serum TNF-alpha levels and as a modulator of oxidative stress on hepatic tissue in entodoxic shock model (mice treated with lipopolysaccharide (LPS)). Ozone/oxygen gaseous mixture which was administered intraperitoneally (0.2, 0.4, and 1.2 mg/kg) once daily for five days before LPS (0.1 mg/kg, intraperitoneal). TNF-alpha was measured by cytotoxicity on L-929 cells. Biochemical parameters such as thiobarbituric acid reactive substances (TBARS), enzymatic activity of catalase, glutathione peroxidase, and glutathione-S transferase were measured in hepatic tissue. One hour after LPS injection there was a significant increase in TNF-alpha levels in mouse serum. Ozone/oxygen gaseous mixture reduced serum TNF-alpha levels in a dose-dependent manner. Statistically significant decreases in TNF-alpha levels after LPS injection were observed in mice pretreated with ozone intraperitoneal applications at 0.2 (78%), 0.4 (98%), and 1.2 (99%). Also a significant increase in TBARS content was observed in the hepatic tissue of LPS-treated mice, whereas enzymatic activity of glutathion-S transferase and glutathione peroxidase was decreased. However in ozone-treated animals a significant decrease in TBARS content was appreciated as well as an increase in the activity of antioxidant enzymes. These results indicate that ozone oxidative preconditioning exerts inhibitory effects on TNF-alpha production and on the other hand it exerts influence on the antioxidant-prooxidant balance for preservation of cell redox state by the increase of endogenous antioxidant systems.
authors.affiliation: Department of Biomedicine, Ozone Research Center, National center for Scientific Research, Havana, Cuba. ozono@infomed.sld.cu
authors.forename: Zullyt B
authors.initials: ZB
authors.lastname: Zamora
authors.forename: Aluet
authors.initials: A
authors.lastname: Borrego
authors.forename: Orlay Y
authors.initials: OY
authors.lastname: López
authors.forename: René
authors.initials: R
authors.lastname: Delgado
authors.forename: Ricardo
authors.initials: R
authors.lastname: González
authors.forename: Silvia
authors.initials: S
authors.lastname: Menéndez
authors.forename: Frank
authors.initials: F
authors.lastname: Hernández
authors.forename: Siegfried
authors.initials: S
authors.lastname: Schulz
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000187:drug effects / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005979:Glutathione Peroxidase / Q000187:drug effects / Q000378:metabolism; D005980:Glutathione Reductase / Q000187:drug effects / Q000378:metabolism; D007700:Kinetics; D008070:Lipopolysaccharides; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D016877:Oxidants / Q000378:metabolism*; D018384:Oxidative Stress; D010126:Ozone / Q000494:pharmacology*; D012772:Shock, Septic / Q000378:metabolism* / Q000517:prevention & control; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D008070:Lipopolysaccharides; D016877:Oxidants; D017392:Thiobarbituric Acid Reactive Substances; D014409:Tumor Necrosis Factor-alpha; D010126:Ozone; D002374:Catalase; D005979:Glutathione Peroxidase; D005980:Glutathione Reductase