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- W2279363246 abstract "We examined the effects of ozone (O(3)) and endogenous antioxidant transport on canine peripheral airway function, central airway function, epithelial integrity, and inflammation. Dogs were either untreated or pretreated with probenecid (an anion-transport inhibitor) and exposed for 6 h to 0.2 parts/million O(3). Peripheral airway resistance (Rpa) and reactivity (DeltaRpa) were monitored in three sublobar locations before and after exposure to either air or O(3). Pulmonary resistance and transepithelial potential difference in trachea and bronchus were also recorded. Bronchoalveolar lavage fluid (BALF) was collected before, during, and after exposure. O(3) increased Rpa and DeltaRpa only in probenecid-treated dogs and in a location-dependent fashion. Pulmonary resistance and potential difference in bronchus increased after O(3) exposure regardless of treatment. O(3) markedly increased BALF neutrophils only in untreated dogs. With the exception of hexanal, O(3) did not alter any BALF constituent examined. Probenecid reduced BALF ascorbate, BALF protein, and plasma urate. We conclude that 1) a 6-h exposure to 0.2 parts/million O(3) represents a subthreshold stimulus in relation to its effects on peripheral airway function in dogs, 2) antioxidant transport contributes to the maintenance of normal airway tone and reactivity under conditions of oxidant stress, 3) O(3)-induced changes in Rpa and DeltaRpa are dependent on location, and 4) peripheral airway hyperreactivity and inflammation reflect independent responses to O(3) exposure. Finally, although anion transport mitigates the effect of O(3) on peripheral airway function, it contributes to the development of airway inflammation and may represent a possible target for anti-inflammatory prevention or therapy." @default.
- W2279363246 created "2016-06-24" @default.
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- W2279363246 date "1999-11-01" @default.
- W2279363246 modified "2023-09-24" @default.
- W2279363246 title "Antioxidant transport modulates peripheral airway reactivity and inflammation during ozone exposure" @default.
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- W2279363246 doi "https://doi.org/10.1152/jappl.1999.87.5.1595" @default.
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