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- W2234853826 abstract "The premise of this study was that complement fragments would lead to granulocyte infiltration and to associated changes in airways reactivity. Inflammation was induced in large airways (greater than 1.0 mm) by aerosolization of the complement chemotactic factor, C5a des arg, which was isolated from activated human serum. Pulmonary function (resistance, compliance, and lung volume) and histamine reactivity were assessed at 4 and at 48 h after C5a des arg or a saline sham aerosol. Four hours after exposure to C5a des arg, the animals exhibited evidence of significant bronchoconstriction and hyperinflation. In addition, an increased responsiveness to histamine was demonstrated, which was not correlated with the degree of bronchospasm. By 48 h, these alterations were partially or completely resolved. Histologic examination and quantitation demonstrated significant accumulation of neutrophils, which was limited to airways 0.5 mm in or larger. Saline-treated animals also demonstrated a neutrophil infiltration, but significantly less than those treated with C5a des arg. However, these animals did not demonstrate hyperreactivity to histamine, and there was little change in baseline mechanical function. The mild inflammation associated in the saline control animals was demonstrated to be a result of intubation of the airways. Granulocyte dependence of the effects of C5a des arg was partially established by abrogation of these effects when the animals were rendered granulocytopenic with nitrogen mustard. We conclude that the physiologic responses of the airways to C5a des arg were largely granulocyte dependent. However, since granulocyte accumulation could occur without airways dysfunction, it is suggested that cell activation is an important step in producing neutrophil-associated airways hyperresponsiveness." @default.
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- W2234853826 date "1986-10-01" @default.
- W2234853826 modified "2023-09-23" @default.
- W2234853826 title "Airways hyperreactivity and inflammation produced by aerosolization of human C5A des arg." @default.
- W2234853826 doi "https://doi.org/10.1164/arrd.1986.134.4.777" @default.
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