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- W1998033013 abstract "A single, acute exposure to ozone has been shown to modify the antioxidant defense mechanism in the respiratory tract.The aim of this study was to evaluate the effects of ozone exposure on antioxidant response in BALB/c mice.We measured enhanced pause of breathing (Penh) as a marker of airway obstruction using barometric whole-body plethysmography before and after ozone exposure [groups (n = 6): filtered air, 0.12 ppm, 0.5 ppm, 1 ppm, 2 ppm] for 3 h. Antioxidant levels were measured using high-performance liquid chromatography with electrochemical detection in bronchoalveolar lavage (BAL) fluid and lung tissue homogenates.Malondialdehyde concentrations in lung tissue homogenates were significantly increased in the group exposed to 2-ppm ozone compared to the filtered air group. Uric acid and gamma-tocopherol concentrations in BAL fluid were significantly increased in the ozone exposure group compared to the filtered air group (p < 0.01). Uric acid concentrations were increased in a concentration-dependent manner according to ozone concentration to which the animals were exposed. Increases in Penh after ozone exposure were significantly higher in an ozone concentration-dependent manner. The proportion of neutrophils in BAL fluid was significantly higher in the group exposed to 2 ppm than in the filtered air and the group exposed to 0.12 ppm (p < 0.01, respectively). The level of ascorbate correlated with the level of gamma-tocopherol.These findings suggest that antioxidant responses may serve as a protective mechanism against a range of oxidants in BALB/c mice exposed to ozone." @default.
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- W1998033013 date "2005-01-01" @default.
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- W1998033013 title "Antioxidant Responsiveness in BALB/c Mice Exposed to Ozone" @default.
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- W1998033013 doi "https://doi.org/10.1159/000083405" @default.
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