Cited by 43Endoplasmic Reticulum Stress and DiseaseOccupational and environmental lung diseasesInterstitial Lung Diseases and Idiopathic Pulmonary Fibrosis

Asbestos-induced Disruption of Calcium Homeostasis Induces Endoplasmic Reticulum Stress in Macrophages

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Ryan, Alan J., Larson-Casey, Jennifer L., He, Chao, Murthy, Shuhba, Carter, A.Brent·2014·Journal of Biological Chemistry

Abstract

Although the mechanisms for fibrosis development remain largely unknown, recent evidence indicates that endoplasmic reticulum (ER) stress and activation of the unfolded protein response (UPR) may act as an important fibrotic stimulus in diseased lungs. ER stress is observed in lungs of patients with idiopathic pulmonary fibrosis. In this study we evaluated if ER stress and the UPR was present in macrophages exposed to chrysotile asbestos and if ER stress in macrophages was associated with asbestos-induced pulmonary fibrosis. Macrophages exposed to chrysotile had elevated transcript levels of several ER stress genes. Macrophages loaded with the Ca(2+)-sensitive dye Fura2-AM showed that cytosolic Ca(2+) increased significantly within minutes after chrysotile exposure and remained elevated for a prolonged time. Chrysotile-induced increases in cytosolic Ca(2+) were partially inhibited by either anisomycin, an inhibitor of passive Ca(2+) leak from the ER, or 1,2-bis(2-aminophenoxyl)ethane-N,N,N',N'-tetraacetic acid (BAPTA-AM), an intracellular Ca(2+) chelator known to deplete ER Ca(2+) stores. Anisomycin inhibited X-box-binding protein 1 (XBP1) mRNA splicing and reduced immunoglobulin-binding protein (BiP) levels, whereas BAPTA-AM increased XBP1 splicing and BiP expression, suggesting that ER calcium depletion may be one factor contributing to ER stress in cells exposed to chrysotile. To evaluate ER stress in vivo, asbestos-exposed mice showed fibrosis development, and alveolar macrophages from fibrotic mice showed increased expression of BiP. Bronchoalveolar macrophages from asbestosis patients showed increased expression of several ER stress genes compared with normal subjects. These findings suggest that alveolar macrophages undergo ER stress, which is associated with fibrosis development.

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Crossref · 10.1074/jbc.m114.579870

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  • This latter pathway can account for the rapidity of changes in the metal concentration.

    “This latter pathway can account for the rapidity of changes in the metal concentration [124].”

    From Asbestos and Iron (2023) · cites this paper as [124]

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Authors
Ryan, A. J., Larson-Casey, J. L., He, C., Murthy, S., & Carter, A. B.
Affiliations
University of Iowa (US)
Corresponding author
Carter, A.Brent
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2014-11
Volume
289
Issue
48
Pages
33391-33403
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2088671967
Cited by
43
References
53
Citations by year
2025: 4 · 2024: 6 · 2023: 2 · 2021: 5 · 2020: 3 · 2019: 6 · 2018: 7 · 2017: 6 · 2016: 1 · 2015: 3
FWCI
1.66
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (2 ROI ES 015981-08, P30 CA086862)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • 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
Keywords
asbestos, chrysotile, endoplasmic reticulum stress, unfolded protein response, pulmonary fibrosis, asbestosis, alveolar macrophages, calcium homeostasis, intracellular calcium, ER calcium depletion, XBP1 splicing, BiP, BAPTA-AM, anisomycin, idiopathic pulmonary fibrosis
MeSH terms
Regulatory Factor X Transcription Factors, X-Box Binding Protein 1, Adolescent, Adult, Animals, Asbestosis, Calcium, DNA-Binding Proteins, Female, Humans, Male, Pulmonary Fibrosis, RNA Splicing, Transcription Factors, Macrophages, Alveolar, Asbestos, Serpentine, Mice, Endoplasmic Reticulum Stress

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