Cited by 74Occupational and environmental lung diseasesInterstitial Lung Diseases and Idiopathic Pulmonary FibrosisPhagocytosis and Immune Regulation

Quantitative analysis of the role of fiber length on phagocytosis and inflammatory response by alveolar macrophages

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Padmore, Trudy, Stark, Carahline, Turkevich, Leonid A., Champion, Julie A.·2017·Biochimica et Biophysica Acta (BBA) - General Subjects

Abstract

Background In the lung, macrophages attempt to engulf inhaled high aspect ratio pathogenic materials, secreting inflammatory molecules in the process. The inability of macrophages to remove these materials leads to chronic inflammation and disease. How the biophysical and biochemical mechanisms of these effects are influenced by fiber length remains undetermined. This study evaluates the role of fiber length on phagocytosis and molecular inflammatory responses to non-cytotoxic fibers, enabling development of quantitative length-based models.Methods Murine alveolar macrophages were exposed to short and long populations of JM-100 glass fibers, produced by successive sedimentation and repeated crushing, respectively. Interactions between fibers and macrophages were observed using time-lapse video microscopy, and quantified by flow cytometry. Inflammatory biomolecules (TNF-α, IL-1α, COX-2, PGE 2) were measured.Results Uptake of short fibers occurred more readily than for long, but long fibers were more potent stimulators of inflammatory molecules. Stimulation resulted in dose-dependent secretion of inflammatory biomolecules but no cytotoxicity or strong ROS production. Linear cytokine dose-response curves evaluated with length-dependent potency models, using measured fiber length distributions, resulted in identification of critical fiber lengths that cause frustrated phagocytosis and increased inflammatory biomolecule production.Conclusion Short fibers played a minor role in the inflammatory response compared to long fibers. The critical lengths at which frustrated phagocytosis occurs can be quantified by fitting dose-response curves to fiber distribution data.General significance The single physical parameter of length can be used to directly assess the contributions of length against other physicochemical fiber properties to disease endpoints.

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Crossref · 10.1016/j.bbagen.2016.09.031

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Authors
Padmore, T., Stark, C., Turkevich, L. A., & Champion, J. A.
Affiliations
  • Georgia Institute of Technology (US)
  • National Institute for Occupational Safety and Health (US)
Corresponding author
Champion, Julie A.
Venue
Biochimica et Biophysica Acta (BBA) - General Subjects
Publisher
Elsevier BV
Published
2017-02
Volume
1861
Issue
2
Pages
58-67
ISSN
0304-4165 (ISSN-L)
OpenAlex
W2535627036
Cited by
74
References
66
Citations by year
2026: 11 · 2025: 6 · 2024: 6 · 2023: 2 · 2022: 9 · 2021: 12 · 2020: 10 · 2019: 8 · 2018: 6 · 2017: 4
FWCI
5.37
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - General Subjects (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (CC999999)
  • Laboratório Nacional de Luz Síncrotron
  • National Institute for Occupational Safety and Health
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
fiber length, alveolar macrophages, phagocytosis, frustrated phagocytosis, inflammation, cytokine production, reactive oxygen species, dose-response curves, critical fiber length, chronic lung inflammation
MeSH terms
Animals, Cells, Cultured, Evaluation Studies as Topic, Glass, Inflammation, Macrophages, Phagocytosis, Tumor Necrosis Factor-alpha, Dinoprostone, Macrophages, Alveolar, Reactive Oxygen Species, Mice, Cyclooxygenase 2, Interleukin-1alpha

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