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- W2064753456 abstract "Increased production of the serum protease plasminogen activator is associated with tissue damage. The in vitro production of plasminogen activator by alveolar macrophages obtained by bronchoalveolar lavage was studied in 22 normal subjects and 28 patients with interstitial lung disease to determine whether plasminogen activator is produced by normal alveolar macrophages and whether this is increased in patients with interstitial lung disease. Plasminogen activator activity, measured with an iodine-125 labelled fibrin release assay, was found to be dependent on time, effector cell numbers, and plasminogen concentration. Plasminogen activator production by alveolar macrophages from 14 normal non-smokers and eight normal smokers was similar and the mean value was 0.78 (SEM 0.16) urokinase (UK) units x 10(-8)/cell/hour. Alveolar macrophages from the seven patients with cryptogenic fibrosing alveolitis and six patients with histiocytosis-X produced more plasminogen activator (1.89 (0.25) and 4.54 (1.3) x 10(-8) UK units/cell/hour respectively) than macrophages from normal subjects (p less than 0.05), whereas those from 15 patients with sarcoidosis did not (1.09 (0.2) x 10(-8) UK units/cell/hour). Exposure of normal alveolar macrophages to immune complexes enhanced plasminogen activator production to 2.07 (0.27) x 10(-8) UK units/cell/hour, whereas exposure to products of activated T cells and to purified gamma interferon reduced plasminogen activator production (to 0.38 (0.11) and 0.62 (0.11) x 10(-8) UK units/cell/hour respectively). These studies show that plasminogen activator is produced by normal human alveolar macrophages and that its production is increased in patients with cryptogenic fibrosing alveolitis and histiocytosis-X." @default.
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- W2064753456 date "1988-07-01" @default.
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- W2064753456 title "Production of plasminogen activator by alveolar macrophages in normal subjects and patients with interstitial lung disease." @default.
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- W2064753456 doi "https://doi.org/10.1136/thx.43.7.508" @default.
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