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Alveolar macrophages from subjects with chronic obstructive pulmonary disease are deficient in their ability to phagocytose apoptotic airway epithelial cells
Abstract
Chronic obstructive pulmonary disease is a highly prevalent, complex disease, usually caused by cigarette smoke. It causes serious morbidity and mortality and costs the global community billions of dollars per year. While chronic inflammation, extracellular matrix destruction and increased airway epithelial cell apoptosis are reported in chronic obstructive pulmonary disease, the understanding of the basic pathogenesis of the disease is limited and there are no effective treatments. We hypothesized that the accumulation of apoptotic airway epithelial cells chronic obstructive pulmonary disease in could be due to defective phagocytic clearance by alveolar macrophages. There have been no previous studies of the phagocytic capacity of alveolar macrophages in chronic obstructive pulmonary disease using physiologically relevant apoptotic airway epithelial cells as phagocytic targets. We developed a phagocytosis assay whereby cultured 16HBE airway epithelial cells were induced to apoptosis with ultraviolet radiation and stained with mitotracker green. Alveolar macrophages from bronchoalveolar lavage from eight control and six chronic obstructive pulmonary disease subjects were analysed following 1.5 h incubation with apoptotic airway epithelial cells, then staining with macrophage marker anti CD33. CD33+/mitotracker green + events (i.e., alveolar macrophages which had phagocytosed apoptotic airway epithelial cells) were analysed using flow cytometry. Phagocytosis of polystyrene microbeads was investigated in parallel. A significantly reduced proportion of alveolar macrophages from chronic obstructive pulmonary disease subjects ingested apoptotic airway epithelial cells compared with controls (11.6 ± 4.1% for chronic obstructive pulmonary disease versus 25.6 ± 9.2% for control group). Importantly, the deficiency was not observed using polystyrene beads, suggesting that the failure to resolve epithelial damage in chronic obstructive pulmonary disease may result, at least partially, from specific defects in phagocytic ability of alveolar macrophages to ingest apoptotic airway epithelial cells.
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“Impaired phagocytosis and clearance of cellular debris by airway macrophages in COPD result in persistent inflammation (85, 104).”
From Aging and Lung Disease (2020) · cites this paper as [104]
In the citing paper
“Specifically, macrophages, which can produce multiple proinflammatory cytokines and secrete MMPs, are the most abundant cell type in the BAL fluid of COPD patients, and increased numbers correlate with disease severity (85, 86, 104).”
From Aging and Lung Disease (2020) · cites this paper as [104]
In the citing paper
“Due to reduced immunity, coexisting comorbidities, and age-associated functional limitations, the incidence of severe sepsis and septic shock increases in older individuals (104, 146).”
From Aging and Lung Disease (2020) · cites this paper as [104]
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“Crucial for our understanding of the pathogenesis of this and other chronic lung diseases was the identification of a significant defect in the ability of pulmonary macrophages to phagocytose apoptotic airway epithelial cells (defective efferocytosis) [1,2], which may contribute to an excess of apoptotic material, sec…”
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Macrophages: the overlooked target for pulmonary fibrosis and COPD
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Molecular pathogenesis of non-eosinophilic asthma
Baines, K. J. (2008) · NOVA (University of Newcastle Australia) · Cited by 1
Asare, P. F., Hodge, G. L., Ween, M. P., Hamon, R., Truong, T. T., Jersmann, H. P. A., Reynolds, P. N., Hodge, S. J., & Tran, H. B. (2024) · Preprints.org · doi:10.20944/preprints202403.1380.v1
Self-citationAsare, P. F., Hodge, G. L., Ween, M. P., Hamon, R., Truong, T. T., Jersmann, H. P. A., Reynolds, P. N., Hodge, S. J., & Tran, H. B. (2024) · Preprints.org · doi:10.20944/preprints202403.1380.v2
Self-citationInfectious Mechanisms Regulating Susceptibility to Acute Exacerbations of COPD
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Eosinophilic airways inflammation in Chronic Obstructive Pulmonary Disease
Eltboli, O. (2015) · Figshare
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Biological Therapies in Development for COPD
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Cigarette smoke impairs innate host defense against pneumoccal pneumonia
Phipps, J. C. (2009) · Deep Blue (University of Michigan)
Investigating a potential role for macrolide therapy in COPD
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Chronic Obstructive Pulmonary Disease (COPD): Local and Systemic Disease
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Groves, A. M. (2013) · Rutgers University Community Repository (Rutgers University) · doi:10.7282/t3hh6hpc
“These data provide additional support for a role of activated macrophages in the development of chronic lung diseases in the elderly (Hodge et al., 2003; Sharma et al., 2009).”
BackgroundResultThe immunopathology of chronic suppurative lung disease in Northern Territory children
Pizzutto, S. J. (2015) · CDU eSpace Institutional Repository (Charles Darwin University) · doi:10.25913/5eb24e6b615d2
Macrophage subpopulations in COPD
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Macrólidos en enfermedades inflamatorias crónicas de las vías respiratorias
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Metadata
- Authors
- Hodge, S., Hodge, G., Scicchitano, R., Reynolds, P. N., & Holmes, M.
- Affiliations
- Royal Adelaide Hospital (AU)
- Women's and Children's Hospital (AU)
- Venue
- Immunology & Cell Biology
- Publisher
- Wiley
- Published
- 2003-08
- Volume
- 81
- Issue
- 4
- Pages
- 289-296
- ISSN
- 0004-945X (ISSN-L)
- 0818-9641
- 1440-1711
- OpenAlex
- W1980191732
- Cited by
- 440
- References
- 32
- Citations by year
- 2026: 7 · 2025: 15 · 2024: 17 · 2023: 12 · 2022: 17 · 2021: 34 · 2020: 19 · 2019: 17 · 2018: 23 · 2017: 21 · 2016: 28 · 2015: 28 · 2014: 13 · 2013: 32 · 2012: 20
- FWCI
- 11.12
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Immunology and Cell Biology (publishedVersion)
- PubMed (publishedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
- Funders
- Royal Adelaide Hospital
- Australian Lung Foundation
- Topics
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Chronic Obstructive Pulmonary Disease (COPD) Research
- Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
- Keywords
- chronic obstructive pulmonary disease, alveolar macrophages, phagocytosis, cigarette smoke, 16HBE cells, MitoTracker Green, CD33, phagocytic defects
- MeSH terms
- Aged, Antibodies, Monoclonal, Bronchoalveolar Lavage Fluid, Cell Line, Transformed, Cell Survival, Epithelial Cells, Flow Cytometry, Humans, Phagocytosis, Macrophages, Alveolar, Apoptosis, Respiratory Mucosa, Pulmonary Disease, Chronic Obstructive
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