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Updated: Sep 1, 2025
Isolation and In Vitro Culture of Murine and Human Alveolar Macrophages
Published on: April 20, 2018
Alveolar macrophages in early stage COPD show functional deviations with properties of impaired immune activation
Kevin Baßler1, Wataru Fujii1, Theodore S Kapellos1
1Genomics and Immunoregulation, Life & Medical Sciences (LIMES) Institute, University of Bonn, Bonn, Germany.
Abstract:
Despite its high prevalence, the cellular and molecular mechanisms of chronic obstructive pulmonary disease (COPD) are far from being understood. Here, we determine disease-related changes in cellular and molecular compositions within the alveolar space and peripheral blood of a cohort of COPD patients and controls. Myeloid cells were the largest cellular compartment in the alveolar space with invading monocytes and proliferating macrophages elevated in COPD. Modeling cell-to-cell communication, signaling pathway usage, and transcription factor binding predicts TGF-β1 to be a major upstream regulator of transcriptional changes in alveolar macrophages of COPD patients. Functionally, macrophages in COPD showed reduced antigen presentation capacity, accumulation of cholesteryl ester, reduced cellular chemotaxis, and mitochondrial dysfunction, reminiscent of impaired immune activation.
Insights
Chronic obstructive pulmonary disease (COPD) involves increased myeloid cells in the lungs. Macrophages in COPD patients exhibit impaired immune functions, suggesting new therapeutic targets.
Area of Science:
- Pulmonary Medicine
- Immunology
- Cellular Biology
Background:
- Chronic obstructive pulmonary disease (COPD) is highly prevalent but its cellular and molecular mechanisms remain poorly understood.
- Investigating the alveolar space and peripheral blood provides insights into COPD pathogenesis.
Purpose of the Study:
- To identify disease-related cellular and molecular changes in the alveolar space and peripheral blood of COPD patients.
- To elucidate the upstream regulators and functional consequences of these changes, particularly in alveolar macrophages.
Main Methods:
- Analysis of cellular and molecular composition in alveolar and blood samples from COPD patients and controls.
- Computational modeling of cell-to-cell communication, signaling pathways, and transcription factor binding.
- Functional assessment of alveolar macrophages, including antigen presentation, lipid accumulation, chemotaxis, and mitochondrial function.
Main Results:
- Myeloid cells, particularly monocytes and macrophages, were elevated in the alveolar space of COPD patients.
- Transforming growth factor-beta 1 (TGF-β1) was predicted as a key regulator of transcriptional changes in alveolar macrophages.
- COPD-associated alveolar macrophages displayed reduced antigen presentation, cholesteryl ester accumulation, impaired chemotaxis, and mitochondrial dysfunction.
Conclusions:
- COPD pathogenesis involves significant alterations in myeloid cell populations and function within the alveolar space.
- Impaired immune activation, particularly in macrophages, is a key feature of COPD.
- TGF-β1 signaling is a critical upstream regulator of macrophage dysfunction in COPD, offering potential therapeutic avenues.
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