Related Experiment Videos
Isolation of functionally active pleural macrophages
R P Baughman1, J Doers, E E Lower
1Department of Medicine, University of Cincinnati Medical Center, Ohio.
Abstract:
Pleural fluid provides an easily accessible source of tissue macrophages (MACS). We established a method for retrieval and isolation of these cells. Thirty thoracenteses were performed on patients with the clinical diagnosis of congestive heart failure or malignancy. Within 4 hr of thoracentesis, the specimen was placed on a Ficoll-Hypaque gradient, centrifuged, and the mononuclear cells were isolated. Assessment for total cell count, cell viability, and percentage of cells which were MACS as determined by nonspecific esterase staining was recorded. Pleural MACS were separated by glass adherence. In 24 cases, sufficient cells were available to measure the release of hydrogen peroxide spontaneously and with phorbol myristate acetate (PMA) stimulation. Nine of 24 specimens had spontaneous hydrogen peroxide release. In all cases, stimulation of pleural MACS resulted in a significant increase in the amount of hydrogen peroxide released. We report a simple method for retrieving viable and functionally active pleural macrophages.
Insights
Researchers developed a simple method to isolate viable and functional pleural macrophages from patient fluid. This technique allows for the study of these important immune cells, crucial for understanding lung health and disease.
Area of Science:
- Immunology
- Cell Biology
- Pulmonology
Background:
- Pleural fluid is an accessible source of tissue macrophages (MACS).
- Understanding pleural macrophage function is vital for diagnosing and treating various lung conditions.
Purpose of the Study:
- To establish a simple and effective method for retrieving viable and functionally active pleural macrophages.
- To characterize the inflammatory response of isolated pleural macrophages.
Main Methods:
- Collected pleural fluid from 30 patients undergoing thoracentesis for heart failure or malignancy.
- Isolated mononuclear cells using Ficoll-Hypaque gradients within 4 hours of collection.
- Assessed cell viability, total cell count, and macrophage percentage via nonspecific esterase staining.
- Separated pleural macrophages using glass adherence and measured hydrogen peroxide release.
Main Results:
- A straightforward method for isolating viable pleural macrophages was successfully established.
- Isolated pleural macrophages demonstrated functional activity, including spontaneous and stimulated hydrogen peroxide release.
- Stimulation with phorbol myristate acetate (PMA) significantly increased hydrogen peroxide release in all tested specimens.
Conclusions:
- The described method provides a reliable way to obtain functional pleural macrophages for research.
- These findings highlight the potential of pleural macrophages in inflammatory processes and disease.
- This technique facilitates further investigation into the role of macrophages in pleural effusions.