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Electron microscopy of macrophages obtained from bronchial lavage-fluid
Abstract:
The ultrastructure of pulmonary alveolar macrophages (PAM) was studied in smokers, non-smokers, and in patients with alveolar proteinosis, Boeck-sarcoidosis and heavy-metal coniosis. Cells were collected from therapeutic or diagnostic bronchial lavage-fluid. Typical alterations are reported for each disease studied. Diagnostic bronchial lavage has opened new perspectives in pulmonology. However, the study of the cellular constituents of the lavage requires in addition to morphology, biochemical and immunological techniques. The most frequently occurring cell type of the bronchial lavage is alveolar macrophage (AM, AMA, PAM). In the intact lung its number amounts to 15 X 10(9). These cells are 12-20 microns in diameter and when stained with Giemsa, dark blue cytoplasmic granules and cytoplasmic vacuoles are seen. They are PAS-positive and contain a negligible amount of lipids. Cytochemistry has shown several enzymes in PAM. With transmission electron microscopy a polymorphic, excentric nucleus and single membrane-bound cytoplasmic inclusions were demonstrated. The surface properties of PAM were studied by scanning electron microscopy. The aim of the present study was to give account of electron microscopic findings in therapeutic and diagnostic bronchial lavage.
Insights
Ultrastructural analysis of pulmonary alveolar macrophages (PAM) revealed distinct cellular alterations in smokers and patients with specific lung diseases. Bronchial lavage microscopy offers valuable diagnostic insights into pulmonary conditions.
Area of Science:
- Pulmonology
- Cell Biology
- Pathology
Background:
- Pulmonary alveolar macrophages (PAM) are crucial immune cells in the lung.
- Bronchial lavage is a diagnostic tool providing access to lung cells.
- Understanding PAM ultrastructure is key to diagnosing lung diseases.
Purpose of the Study:
- To investigate the ultrastructural changes in pulmonary alveolar macrophages (PAM).
- To correlate these ultrastructural findings with smoking status and specific lung diseases.
- To highlight the diagnostic utility of electron microscopy in bronchial lavage.
Main Methods:
- Collection of cells via therapeutic or diagnostic bronchial lavage.
- Morphological analysis using transmission and scanning electron microscopy.
- Cytochemical staining and Giemsa staining for cellular characterization.
Main Results:
- Distinct ultrastructural alterations in PAM were identified in smokers, non-smokers, and patients with alveolar proteinosis, Boeck-sarcoidosis, and heavy-metal coniosis.
- PAM exhibit specific features like polymorphic nuclei, cytoplasmic inclusions, granules, and vacuoles.
- Scanning electron microscopy provided insights into PAM surface properties.
Conclusions:
- Electron microscopy of bronchial lavage fluid provides valuable diagnostic information on pulmonary alveolar macrophages.
- Ultrastructural analysis of PAM can differentiate between various lung pathologies and smoking status.
- Diagnostic bronchial lavage combined with advanced microscopy opens new avenues in pulmonology.