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[Oxygen radical formation in pulmonary sarcoidosis. The signs of early macrophage activation]
Abstract:
Oxygen radical formation of alveolar macrophages (by luminogenic substrate-intensified chemiluminescence) and the concentrations of phagocyte products myeloperoxidase, elastase and lactoferrin, as well as alpha-proteinase inhibitor and albumin were measured in bronchoalveolar lavage fluid of 28 patients with pulmonary sarcoidosis. There were 15 men and 13 women (mean age 41 [18-62] years), 10 of them with sarcoidosis I, 10 with clinically active sarcoidosis II and 8 with inactive sarcoidosis II. Six healthy persons served as controls. The purpose of the study was to demonstrate the extent of correlation between macrophage activity and stage of sarcoidosis. Patients in stage I had significantly higher luminescence (346 +/- 253 relative light units [RLU] per second) than the controls (117 +/- 29 RLU/s; P less than 0.02). But the difference between controls and patients in clinically active stage II (294 +/- 75 RLU/s) was not significant and the luminescence in patients with clinically inactive stage II was within normal range (119 +/- 33 RLU/s). The concentrations of proteins measured in the lavage fluid was increased, independent of the site of formation. These data indicate that in pulmonary sarcoidosis there exists, early and independent of stage, a marked activation of alveolar macrophages with increased production of oxygen radicals and a resulting increase in permeability of the alveolo-capillary membrane.
Insights
Pulmonary sarcoidosis patients show early alveolar macrophage activation and increased oxygen radical production, even in stage I. This heightened macrophage activity correlates with increased alveolo-capillary membrane permeability.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cell Biology
Context:
- Pulmonary sarcoidosis is an inflammatory disease affecting the lungs.
- Alveolar macrophages play a key role in lung immunity and inflammation.
- Understanding macrophage activity in sarcoidosis is crucial for disease management.
Purpose:
- To investigate the correlation between alveolar macrophage activity and the stage of pulmonary sarcoidosis.
- To quantify oxygen radical formation and phagocyte product levels in patients with varying sarcoidosis stages.
- To assess the impact of macrophage activation on alveolo-capillary membrane integrity.
Summary:
- This study measured oxygen radical formation and protein concentrations in bronchoalveolar lavage fluid from 28 pulmonary sarcoidosis patients and 6 healthy controls.
- Patients in stage I sarcoidosis exhibited significantly higher macrophage luminescence (oxygen radical production) compared to controls.
- While active stage II patients showed elevated levels, inactive stage II patients had normal luminescence, indicating early, stage-independent macrophage activation.
Impact:
- Early activation of alveolar macrophages and increased oxygen radical production are characteristic of pulmonary sarcoidosis, irrespective of disease stage.
- Elevated macrophage activity leads to increased permeability of the alveolo-capillary membrane.
- These findings highlight potential therapeutic targets for mitigating lung damage in early-stage sarcoidosis.