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- W2034146535 abstract "The time course of the development of airway hyperresponsiveness (AHR) to inhaled acetylcholine (ACh) and the associated inflammatory cell recovery in bronchoalveolar lavage fluid (BAL) in actively sensitised Brown-Norway rats was studied following challenge with inhaled ovalbumin (OA). IgE for OA was detected in serum obtained from sensitised rats using passive cutaneous anaphylaxis, at titres of 1:10 to 1:30; none was detected in unsensitised animals. There was no significant change in either airway responsiveness to inhaled ACh or in BAL cell counts in rats challenged with saline over the 24 h. Following challenge with a 1% OA aerosol, airway responsiveness to inhaled ACh increased over the 24-hour period, maximal at 18–24 h (saline-challenged group mean ––log PC200 1.95 ± 0.07 M; OA-challenged group mean –log PC200 2.30 ± 0.05 M; p < 0.01). The composition of the inflammatory cells in the BAL fluid after allergen inhalation varied over the 24-hour period, with an initial neutrophilia at 5––8 h (p < 0.01), followed at 18–24 h by an increase in lymphocytes (p < 0.01) and marked eosinophilia (p < 0.01). There was a significant correlation between airway responsiveness and eosinophil recovery at 5–8 h (p < 0.05), and at 18-24 h after allergen exposure (p < 0.05). At 18–24 h there was also a significant correlation between neutrophils and airway responsiveness (p < 0.05). There was no difference between baseline lung resistance in matched saline- or OA-challenged animals at each time point. This animal model may be useful to study the cells and mediators involved in the development of allergen-induced AHR." @default.
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- W2034146535 date "1992-01-01" @default.
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- W2034146535 title "Airway Hyperresponsiveness is Associated with Inflammatory Cell Infiltration in Allergic Brown-Norway Rats" @default.
- W2034146535 doi "https://doi.org/10.1159/000236340" @default.
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