4.7 Article

DNA Methylome Alterations Are Associated with Airway Macrophage Differentiation and Phenotype during Lung Fibrosis

Journal

Publisher

AMER THORACIC SOC
DOI: 10.1164/rccm.202101-0004OC

Keywords

pathogenesis; monocytes; epigenetics; DNA methylation; interstitial lung disease

Funding

  1. National Heart and Lung Institute Pilot Award
  2. Asthma UK [AUK-SNF-2017-381]
  3. National Institute for Health Research Clinician Scientist Fellowship from the Health Services and Delivery Research Programme [CS-2013-13-017]
  4. British Lung Foundation Chair in Respiratory Research [C173]
  5. Wellcome Trust Senior Fellowship in Basic Biomedical Science [107059/Z/15/Z]

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This study analyzed the DNA methylation of airway macrophages (AMs) in healthy individuals and those with IPF, revealing epigenetic heterogeneity in IPF AMs. Differential analysis showed that DNA methylation in IPF was associated with disease severity, indicating a link between epigenetic changes and the development and function of AMs in IPF lungs.
Rationale: Airway macrophages (AMs) are key regulators of the lung environment and are implicated in the pathogenesis of idiopathic pulmonary fibrosis (IPF), a fatal respiratory disease with no cure. However, knowledge about the epigenetics of AMs in IPF is limited. Objectives: To assess the role of epigenetic regulation of AMs during lung fibrosis. Methods: We undertook DNA methylation (DNAm) profiling by using Illumina EPIC (850k) arrays in sorted AMs from healthy donors (n = 14) and donors with IPF (n = 30). Cell-type deconvolution was performed by using reference myeloid-cell DNA methylomes. Measurements and Main Results: Our analysis revealed that epigenetic heterogeneity was a key characteristic of IPF AMs. DNAm clock analysis indicated that epigenetic alterations in IPF AMs were not associated with accelerated aging. In differential DNAm analysis, we identified numerous differentially methylated positions (n = 11) and differentially methylated regions (n = 49) between healthy and IPF AMs, respectively. Differentially methylated positions and differentially methylated regions encompassed genes involved in lipid (LPCAT1 [lysophosphatidylcholine acyltransferase 1]) and glucose (PFKFB3 [6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3]) metabolism, and importantly, the DNAm status was associated with disease severity in IPF. Conclusions: Collectively, our data identify that changes in the epigenome are associated with the development and function of AMs in the IPF lung.

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