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• W1978087923 abstract "In the present study an animal model is described in which a sustained non-specific airway hyperresponsiveness is induced. Guinea pigs were inoculated intratracheally with parainfluenza type 3 (PI-3) virus or control solution. Two, 4, 8, and 16 days after inoculation the tracheae, bronchi, and lung strips were isolated and mounted in organ baths. Two days after inoculation no difference between the control solution and PI-3 virus group was observed, with respect to the histamine concentration/response curve obtained from tracheae, bronchi and lung strips of the respective groups. However, histamine concentration/response curves were significantly (P < 0.01) shifted upwards in all parts of the airways 4, 8, and 16 days after PI-3 inoculation as compared with the control solution. The excessive contraction of the trachea was not specific for histamine, since an increase in the maximal response was obtained also for the cholinergic receptor agonist, arecoline on day 4 (32%, P < 0.05), day 8 (24%, P < 0.05), and day 16 (28%). Morphological examination of the central airways obtained from control solution-inoculated animals revealed no signs of inflammation. However, 2, 4, and 8 days, but not 16 days, after the viral infection, epithelial damage with loss of cilia and mucus-depleted goblet cells were observed. Thus, morphological changes were not directly associated with changes in airways responsiveness. Histological examination of the peripheral airways revealed an influx of inflammatory cells, as shown by typical lesions of patchy alveolitis and bronchiolitis. Bronchiolar epithelium was variously hyperplastic and dysplastic with degenerative changes, and the lumens of the bronchioli were occluded with mucus and inflammatory cells. In conclusion, the virus-induced airway hyperresponsiveness in guinea pigs shows similarities with the human situation, in which a sustained non-specific airway hyperresponsiveness is observed after a respiratory viral infection. In addition, the hyperresponsiveness seems to be accompanied by an influx of inflammatory cells in the airways but not with other morphological changes." @default.
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• W1978087923 date "1992-09-01" @default.
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• W1978087923 title "Viral infection in guinea pigs induces a sustained non-specific airway hyperresponsiveness and morphological changes of the respiratory tract" @default.
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• W1978087923 doi "https://doi.org/10.1016/0926-6917(92)90021-4" @default.
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