title: Vitamin E effect in a rat model of toluene diisocyanate-induced asthma.
abstract: OBJECTIVE
  The aim of the study was to evaluate vitamin E effect upon oxidative stress associated with toluene -2, 4-diisocyanate (TDI)-induced asthma in rats.
  
  
  METHODS
  The five study groups were: control, vehicle, TDI, vehicle+E, TDI+E. TDI animals were sensitized by nasal administration of TDI 10% (5μl/nostril) between days 1-7 and 15-21. Between days 22-28 groups TDI+E and vehicle+E rats received vitamin E (50 mg/kg, i. v.), and control, vehicle and TDI groups received saline solution. On day 29 the rats were challenged by intranasal application of 5% TDI (5 μl/nostril). On day 30 blood, BALF and lung biopsy were harvested. Oxidative stress tests were malondialdehyde (MDA), protein carbonyls (PC), total thiols (tSH), 1,1-diphenyl-2-picryl hydrazyl (DPPH) and reduced glutathione (GSH).
  
  
  RESULTS
  TDI sensitization increased oxidative stress systemically, but also locally in the respiratory airways and lung tissue. There was an increase of MDA and PC formation associated with a deficiency of the antioxidant defense reflected by DPPH decreases. There were no differences between systemic and local lung concentrations of oxidized molecules. After vitamin E treatment oxidative stress was reduced mostly due to serum, BALF and lung tissue GSH and DPPH increase.
  
  
  CONCLUSIONS
  The study showed that in rat TDI-induced asthma there was oxidative stress caused by increased ROS production and antioxidants deficiency, and vitamin E reduced ROS production and improved antioxidant defense.
authors.affiliation: Pulmonology and Allergy Department, CHU Gabriel Montpied Clermont-Ferrand, France; Immunology and Allergy Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.
authors.forename: Andrea Daniela
authors.initials: AD
authors.lastname: Muti
authors.affiliation: Pathophysiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.
authors.forename: Alina Elena
authors.initials: AE
authors.lastname: Pârvu
authors.affiliation: Digestive Medicine Department, CHU Estaing, Clermont-Ferrand, France.
authors.forename: Leon Adrian
authors.initials: LA
authors.lastname: Muti
authors.affiliation: Physiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.
authors.forename: Remus
authors.initials: R
authors.lastname: Moldovan
authors.affiliation: Physiology Department, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.
authors.forename: Adriana
authors.initials: A
authors.lastname: Mureşan
keywords: asthma; isocyanates; oxidative stress; vitamin E