REDD1/autophagy pathway promotes thromboinflammation and fibrosis in human systemic lupus erythematosus (SLE) through NETs decorated with tissue factor (TF) and interleukin-17A (IL-17A).
Autophagy
/ physiology
Cell Culture Techniques
Extracellular Traps
/ metabolism
Fibroblasts
/ metabolism
Fibrosis
/ metabolism
Humans
Inflammation
Interleukin-17
/ metabolism
Lupus Erythematosus, Systemic
/ metabolism
Signal Transduction
Thromboplastin
/ metabolism
Thrombosis
/ metabolism
Transcription Factors
/ metabolism
autophagy
fibrosis
lupus
neutrophils
thromboinflammation
Journal
Annals of the rheumatic diseases
ISSN: 1468-2060
Titre abrégé: Ann Rheum Dis
Pays: England
ID NLM: 0372355
Informations de publication
Date de publication:
02 2019
02 2019
Historique:
received:
04
02
2018
revised:
28
10
2018
accepted:
01
11
2018
pubmed:
20
12
2018
medline:
29
10
2019
entrez:
20
12
2018
Statut:
ppublish
Résumé
The release of neutrophil extracellular traps (NETs) represents a novel neutrophil effector function in systemic lupus erythematosus (SLE) pathogenesis. However, the molecular mechanism underlying NET release and how NETs mediate end-organ injury in SLE remain elusive. NET formation and NET-related proteins were assessed in the peripheral blood and biopsies from discoid lupus and proliferative nephritis, using immunofluorescence, immunoblotting, quantitative PCR and ELISA. Autophagy was assessed by immunofluorescence and immunoblotting. The functional effects of NETs in vitro were assessed in a primary fibroblast culture. Neutrophils from patients with active SLE exhibited increased basal autophagy levels leading to enhanced NET release, which was inhibited in vitro by hydroxychloroquine. NETosis in SLE neutrophils correlated with increased expression of the stress-response protein REDD1. Endothelin-1 (ET-1) and hypoxia-inducible factor-1α (HIF-1α) were key mediators of REDD1-driven NETs as demonstrated by their inhibition with bosentan and L-ascorbic acid, respectively. SLE NETs were decorated with tissue factor (TF) and interleukin-17A (IL-17A), which promoted thrombin generation and the fibrotic potential of cultured skin fibroblasts. Notably, TF-bearing and IL-17A-bearing NETs were abundant in discoid skin lesions and in the glomerular and tubulointerstitial compartment of proliferative nephritis biopsy specimens. Our data suggest the involvement of REDD1/autophagy/NET axis in end-organ injury and fibrosis in SLE, a likely candidate for repositioning of existing drugs for SLE therapy. Autophagy-mediated release of TF-bearing and IL-17A-bearing NETs provides a link between thromboinflammation and fibrosis in SLE and may account for the salutary effects of hydroxychloroquine.
Identifiants
pubmed: 30563869
pii: annrheumdis-2018-213181
doi: 10.1136/annrheumdis-2018-213181
pmc: PMC6352428
doi:
Substances chimiques
DDIT4 protein, human
0
IL17A protein, human
0
Interleukin-17
0
Transcription Factors
0
Thromboplastin
9035-58-9
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
238-248Informations de copyright
© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.
Déclaration de conflit d'intérêts
Competing interests: None declared.
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