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- W2396818974 abstract "Increased numbers of eosinophils in the airways is characteristic of asthma. However, it remains unclear whether airway eosinophils enhance or reduce the release of neuropeptides in the airways in vivo. This study was conducted to elucidate the influence of airway eosinophil accumulation on the ultrasonically nebulized distilled water (UNDW)-induced bronchoconstriction in our newly developed animal model, which is mediated by sensory neuropeptides.Guinea pigs were transnasally treated with 100 mg/kg of platelet activating factor (PAF), or vehicle, twice a week for 3 weeks. We then conducted three experiments. In the first, UNDW was inhaled 20 min after aerosolized antigen challenge, and bronchoalveolar lavage (BAL) was performed in PAF-treated and passively sensitized animals. In the second, PAF-treated animals were exposed for 20 s to ascending doses of methacholine at intervals of 5 min In the third, passively sensitized animals were administered selective NK1 antagonist, SR 140333, selective NK2 antagonist, SR 48968, or vehicle, intravenously 5 min before UNDW-induced bronchoconstriction.The proportion of eosinophils in BAL fluid was significantly increased in guinea pigs treated with PAF, compared with the vehicle. The PAF treatment did not affect antigen-induced immediate asthmatic response, UNDW-induced bronchoconstriction, or bronchial responsiveness to inhaled methacholine. SR 140333, but not SR 48968, inhibited the UNDW-induced bronchoconstriction.We conclude that eosinophils accumulated in the airways, caused by repeated intranasal administration of PAF, does not affect the release of substance P induced by UNDW inhalation, or the action of released substance P in vivo." @default.
- W2396818974 created "2016-06-24" @default.
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- W2396818974 date "2003-01-01" @default.
- W2396818974 modified "2023-09-26" @default.
- W2396818974 title "Airway eosinophil accumulation on sensory neuropeptide release in a guinea pig model of distilled-water-induced bronchoconstriction." @default.
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