Cited by 105Interstitial Lung Diseases and Idiopathic Pulmonary FibrosisPulmonary Hypertension Research and TreatmentsTransplantation: Methods and Outcomes

Epithelial-macrophage interactions determine pulmonary fibrosis susceptibility in Hermansky-Pudlak syndrome

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Young, Lisa R., Gulleman, Peter M., Short, Chelsi W., Tanjore, Harikrishna, Sherrill, Taylor, Qi, Aidong, McBride, Andrew P., Zaynagetdinov, Rinat +4 more·2016·JCI Insight

Abstract

Alveolar epithelial cell (AEC) dysfunction underlies the pathogenesis of pulmonary fibrosis in Hermansky-Pudlak syndrome (HPS) and other genetic syndromes associated with interstitial lung disease; however, mechanisms linking AEC dysfunction and fibrotic remodeling are incompletely understood. Since increased macrophage recruitment precedes pulmonary fibrosis in HPS, we investigated whether crosstalk between AECs and macrophages determines fibrotic susceptibility. We found that AECs from HPS mice produce excessive MCP-1, which was associated with increased macrophages in the lungs of unchallenged HPS mice. Blocking MCP-1/CCR2 signaling in HPS mice with genetic deficiency of CCR2 or targeted deletion of MCP-1 in AECs normalized macrophage recruitment, decreased AEC apoptosis, and reduced lung fibrosis in these mice following treatment with low-dose bleomycin. We observed increased TGF-β production by HPS macrophages, which was eliminated by CCR2 deletion. Selective deletion of TGF-β in myeloid cells or of TGF-β signaling in AECs through deletion of TGFBR2 protected HPS mice from AEC apoptosis and bleomycin-induced fibrosis. Together, these data reveal a feedback loop in which increased MCP-1 production by dysfunctional AECs results in recruitment and activation of lung macrophages that produce TGF-β, thus amplifying the fibrotic cascade through AEC apoptosis and stimulation of fibrotic remodeling.

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Crossref · 10.1172/jci.insight.88947

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  • The pathogenic role of Mo-AMs in lung fibrosis is largely attributed to their production of pro-fibrotic mediators such as TGF-β, PDGF-α, osteopontin, and MMPs.

    “The pathogenic role of Mo-AMs in lung fibrosis has been largely attributed to their activity in producing a number of pro-fibrotic mediators, such as TGF-β, PDGF-α, osteopontin (OPN), and MMPs1,3,11,13,15,18,28.”

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Authors
Young, L. R., Gulleman, P. M., Short, C. W., Tanjore, H., Sherrill, T., Qi, A., McBride, A. P., Zaynagetdinov, R., Benjamin, J. T., Lawson, W. E., Novitskiy, S. V., & Blackwell, T. S.
Affiliations
  • Vanderbilt University (US)
  • Department of Pediatrics, Division of Pulmonary Medicine, and
Corresponding author
Young, Lisa R.
Venue
JCI Insight
Published
2016-10-20
Volume
1
Issue
17
Pages
e88947-e88947
ISSN
2379-3708 (ISSN-L)
OpenAlex
W2536886613
Cited by
105
References
51
Citations by year
2026: 7 · 2025: 10 · 2024: 15 · 2023: 9 · 2022: 16 · 2021: 12 · 2020: 9 · 2019: 9 · 2018: 13 · 2017: 5
FWCI
8.05
Type
journal article
Language
en
Open access
Locations
  • JCI Insight (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • American Thoracic Society
  • Hermansky-Pudlak Syndrome Network
  • Vanderbilt University
  • National Institutes of Health
  • School of Medicine, Vanderbilt University
  • National Heart, Lung, and Blood Institute (R01HL105479, RO1 HL, P01HL092870, R01HL119503, R01HL085317)
  • National Cancer Institute (R01CA200681)
  • National Institute of Child Health and Human Development
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (K12HD087023)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Pulmonary Hypertension Research and Treatments
  • Health Sciences › Medicine › Surgery › Transplantation: Methods and Outcomes
Keywords
Hermansky-Pudlak syndrome, pulmonary fibrosis, alveolar epithelial cells, macrophage recruitment, MCP-1, CCR2, TGF-beta, TGFBR2, bleomycin-induced fibrosis, interstitial lung disease, myeloid cells
MeSH terms
Receptor, Transforming Growth Factor-beta Type II, Animals, Bleomycin, Disease Susceptibility, Epithelial Cells, Female, Macrophages, Male, Mice, Inbred C57BL, Pulmonary Alveoli, Pulmonary Fibrosis, Transforming Growth Factor beta, Protein Serine-Threonine Kinases, Receptors, Transforming Growth Factor beta, Chemokine CCL2, Hermanski-Pudlak Syndrome, Mice, Receptors, CCR2

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