title: Ozone oxidative preconditioning reduces nitrite levels in blood serum in LPS: induced endotoxic shock in mice.
abstract: OBJECTIVE
  Reactive oxygen species, and also reactive species of nitrogen such as nitric oxide, play an important role in the pathogenesis of peritonitis and septic shock. Ozone oxidative preconditioning (OOP) has shown protective effects in various experimental models of peritonitis in rats and endotoxic shock in mice. Currently, strong evidence is available that this protective effect of OOP is due to its action on the balance between endogenous antioxidants and pro-oxidants, which is favorable for anti-oxidant defense. The aim of this research was to elucidate whether or not OOP is able to reduce nitrite levels in blood serum of mice treated with lipopolysaccharide (LPS). We used an experimental model of endotoxic shock induced by LPS in mice in which the animals were pre-treated with ozone/oxygen mixture for 5 days (once daily), with injection of LPS 24 h thereafter to induce endotoxic shock.
  
  
  RESULTS
  Mice pretreated with OOP showed a significant decrease in nitrite levels with all three doses tested [0.2 mg/kg (50.91%), 0.4 mg/kg (47.3%) and 1.2 mg/kg (34.6%)].
  
  
  CONCLUSIONS
  Ozone oxidative preconditioning significantly reduced nitrite levels in blood serum of mice with endotoxic shock induced by LPS. We propose that OOP merits further testing in studies as a potential alternative treatment to reduce nitrite levels in patients with sepsis syndrome and septic shock.
authors.affiliation: Department of Biomedicine, Ozone Research Center (National Center for Scientific Research), PO Box 6414, Havana, Cuba.
authors.forename: Ricardo González
authors.initials: RG
authors.lastname: Alvarez
authors.forename: Zullyt Barbara
authors.initials: ZB
authors.lastname: Zamora
authors.forename: Aluet
authors.initials: A
authors.lastname: Borrego
authors.forename: René
authors.initials: R
authors.lastname: Delgado
authors.forename: Siegfried
authors.initials: S
authors.lastname: Schulz
authors.forename: Yaima
authors.initials: Y
authors.lastname: Alonso
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology; D003907:Dexamethasone / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000633:toxicity*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009573:Nitrites / Q000097:blood*; D010083:Oxidants, Photochemical / Q000494:pharmacology*; D010126:Ozone / Q000494:pharmacology*; D012772:Shock, Septic / Q000097:blood*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D008070:Lipopolysaccharides; D009573:Nitrites; D010083:Oxidants, Photochemical; D010126:Ozone; D003907:Dexamethasone