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- W317754471 abstract "Nitric acid is a common air pollutant possibly associated with airway inflammation. Therefore the authors have exposed healthy, non-smoking volunteers, 18-35 yr of age, once to HNO{sub 3} and once to filtered air for 2 hr with 100 min of moderate exercise. Eighteen hr after exposure bronchoalveolar lavage was performed and the cells and fluid were analyzed for indicators of inflammation. Compared to air, the number of lymphocytes in lavage fluid was increased after HNO{sub 3}; macrophage and PMN counts were unchanged. In a phagocytosis assay, the number of macrophages ingesting unopsinized C. albicans increased from 12% (air to 33%) (HNO{sub 3}); the number ingesting opsonized yeast increased from 58% to 78%. Lavage fluid protein concentration was increased. These preliminary data suggest that HNO{sub 3} exposure results in permeability changes accompanied by lymphocyte infiltration and stimulation of macrophage phagocytosis in the lower airways. The lack of LDH and PMN increases in the lavage, under the conditions tested, suggests that this pollutant does not cause tissue damage in the airways as previously reported with O{sub 3}." @default.
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- W317754471 date "1991-03-11" @default.
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- W317754471 title "Lymphocyte infiltration and increased macrophage phagocytosis in the lungs of HNO sub 3 -exposed humans" @default.
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