Cited by 188Neutrophil, Myeloperoxidase and Oxidative MechanismsInflammation biomarkers and pathwaysBlood Coagulation and Thrombosis Mechanisms

Neutrophil elastase‐deficient mice form neutrophil extracellular traps in an experimental model of deep vein thrombosis

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Martinod, K., Witsch, T., Farley, K., Gallant, M., Remold‐O'Donnell, E., Wagner, D.D.·2016·Journal of Thrombosis and Haemostasis

Abstract

Unlabelled ESSENTIALS: Neutrophil elastase (NE) plays a role in extracellular trap formation (NETosis) triggered by microbes. The contribution of NE was evaluated in mouse NETosis models of sterile inflammation and thrombosis. NE is not required for mouse neutrophil NET production in vitro with non-infectious stimuli. NE deficiency had no significant effect on thrombosis in the inferior vena cava stenosis model.Summary Background Neutrophil serine proteases have been implicated in coagulation and neutrophil extracellular trap (NET) formation. In human neutrophils, neutrophil elastase (NE) translocates to the nucleus during NETosis and cleaves histones, thus aiding in chromatin decondensation. NE(-/-) mice were shown not to release NETs in response to microbes. However, mouse studies evaluating the role of NE in NET formation in sterile inflammation and thrombosis are lacking.Objective We wished to establish if neutrophils from NE(-/-) mice have a defect in NETosis, similar to peptidylarginine deiminase 4 (PAD4(-/-)) mice, and how this might have an impact on venous thrombosis, a model where NETs are produced and are crucial to thrombus development.Methods We performed in vitro NET assays using neutrophils from wild-type (WT), NE(-/-), SerpinB1 (SB1)(-/-) and NE(-/-) SB1(-/-) mice. We compared WT and NE(-/-) animals using the inferior vena cava stenosis model of deep vein thrombosis (DVT).Results Neutrophil elastase deficiency resulted in a small reduction in ionomycin-induced NET formation in vitro without affecting histone citrullination. However, NET production in response to phorbol 12-myristate 13-acetate or platelet activating factor was normal in neutrophils from two independent NE-deficient mouse lines, and in NE(-/-) SB1(-/-) as compared with SB1(-/-) neutrophils. NE deficiency or inhibition did not prevent NETosis in vivo or DVT outcome.Conclusions Neutrophil elastase is not required for NET formation in mice. NE(-/-) mice, which form pathological venous thrombi containing NETs, do not phenocopy PAD4(-/-) mice in in vitro NETosis assays or experimental venous thrombosis. Our study suggests that NET-targeted therapies need to be highly effective to have an impact on DVT.

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Crossref · 10.1111/jth.13239

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Authors
Martinod, K., Witsch, T., Farley, K., Gallant, M., Remold‐O'Donnell, E., & Wagner, D. D.
Affiliations
Boston Children's Hospital (US)
Corresponding author
Wagner, D.D.
Venue
Journal of Thrombosis and Haemostasis
Publisher
Elsevier BV
Published
2016-03
Volume
14
Issue
3
Pages
551-558
ISSN
1538-7836 (ISSN-L)
OpenAlex
W2200350105
Cited by
188
References
30
Citations by year
2026: 7 · 2025: 8 · 2024: 15 · 2023: 21 · 2022: 27 · 2021: 25 · 2020: 19 · 2019: 16 · 2018: 20 · 2017: 13 · 2016: 16
FWCI
8.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Thrombosis and Haemostasis (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • FreiDok plus (Universitätsbibliothek Freiburg) (submittedVersion)
Funders
  • National Heart, Lung, and Blood Institute (R01HL102101, R01HL125501, 5T32HL066987-13)
  • National Institute of Allergy and Infectious Diseases (R21AI103407)
  • Deutsche Gesellschaft fuer Kardiologie
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Inflammation biomarkers and pathways
  • Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
Keywords
neutrophil elastase, neutrophil extracellular traps, NETosis, deep vein thrombosis, venous thrombosis, neutrophils, neutrophil serine proteases, PAD4, chromatin decondensation, inferior vena cava stenosis, sterile inflammation, thrombus formation
MeSH terms
Animals, Cells, Cultured, Disease Models, Animal, Genotype, Mice, Inbred C57BL, Neutrophils, Phenotype, Tetradecanoylphorbol Acetate, Ionomycin, Mice, Knockout, Neutrophil Activation, Leukocyte Elastase, Venous Thrombosis, Extracellular Traps

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