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EBioMedicine. 2019 May 3. pii: S2352-3964(19)30199-9. doi: 10.1016/j.ebiom.2019.03.054. [Epub ahead of print]

The Notch ligand DNER regulates macrophage IFNγ release in chronic obstructive pulmonary disease.

Author information

1
Comprehensive Pneumology Center (CPC), Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany.
2
Institute of Experimental Genetics (IEG), Helmholtz Zentrum München, Munich, Germany.
3
Division of Pneumology, KU Leuven, Leuven 3000, Belgium.
4
Institute of Experimental Genetics (IEG), Helmholtz Zentrum München, Munich, Germany; Chair of Experimental Genetics, Technische Universität München, Freising, Germany; German Center for Diabetes Research (DZD), Germany.
5
Comprehensive Pneumology Center (CPC), Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany; Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado, Denver, CO, USA.
6
Comprehensive Pneumology Center (CPC), Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Center for Lung Research (DZL), Munich, Germany. Electronic address: oender.yildirim@helmholtz-muenchen.de.

Abstract

BACKGROUND:

Chronic Obstructive Pulmonary Disease (COPD) is the third leading cause of death worldwide with no curative therapy. A non-canonical Notch ligand, DNER, has been recently identified in GWAS to associate with COPD severity, but its function and contribution to COPD is unknown.

METHODS:

DNER localisation was assessed in lung tissue from healthy and COPD patients, and cigarette smoke (CS) exposed mice. Microarray analysis was performed on WT and DNER deficient M1 and M2 bone marrow-derived macrophages (BMDM), and gene set enrichment undertaken. WT and DNER deficient mice were exposed to CS or filtered air for 3 day and 2 months to assess IFNγ-expressing macrophages and emphysema development. Notch and NFKB active subunits were quantified in WT and DNER deficient LPS-treated and untreated BMDM.

FINDINGS:

Immunofluorescence staining revealed DNER localised to macrophages in lung tissue from COPD patients and mice. Human and murine macrophages showed enhanced DNER expression in response to inflammation. Interestingly, pro-inflammatory DNER deficient BMDMs exhibited impaired NICD1/NFKB dependent IFNγ signalling and reduced nuclear NICD1/NFKB translocation. Furthermore, decreased IFNγ production and Notch1 activation in recruited macrophages from CS exposed DNER deficient mice were observed, protecting against emphysema and lung dysfunction.

INTERPRETATION:

DNER is a novel protein induced in COPD patients and 6 months CS-exposed mice that regulates IFNγ secretion via non-canonical Notch in pro-inflammatory recruited macrophages. These results provide a new pathway involved in COPD immunity that could contribute to the discovery of innovative therapeutic targets.

FUNDING:

This work was supported from the Helmholtz Alliance 'Aging and Metabolic Programming, AMPro'.

KEYWORDS:

COPD; Cigarette smoke; DNER; IFNγ; Lung; Macrophages; NFkB; Notch signalling

PMID:
31060902
DOI:
10.1016/j.ebiom.2019.03.054
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