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Annals of Intensive Care
Published in: Annals of Intensive Care 1/2017

Open Access 01-12-2017 | Research

Thrombomodulin favors leukocyte microvesicle fibrinolytic activity, reduces NETosis and prevents septic shock-induced coagulopathy in rats

Authors: Julie Helms, Raphaël Clere-Jehl, Elsa Bianchini, Pierrick Le Borgne, Mélanie Burban, Fatiha Zobairi, Jean-Luc Diehl, Lelia Grunebaum, Florence Toti, Ferhat Meziani, Delphine Borgel

Published in: Annals of Intensive Care | Issue 1/2017

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Abstract

Background

Septic shock-induced disseminated intravascular coagulation is responsible for increased occurrence of multiple organ dysfunction and mortality. Immunothrombosis-induced coagulopathy may contribute to hypercoagulability. We aimed at determining whether recombinant human thrombomodulin (rhTM) could control exaggerated immunothrombosis by studying procoagulant responses, fibrinolysis activity borne by microvesicles (MVs) and NETosis in septic shock.

Methods

In a septic shock model after a cecal ligation and puncture-induced peritonitis (H0), rats were treated with rhTM or a placebo at H18, resuscitated and monitored during 4 h. At H22, blood was sampled to perform coagulation tests, to characterize MVs and to detect neutrophils extracellular traps (NETs). Lungs were stained with hematoxylin–eosin for inflammatory injury assessment.

Results

Coagulopathy was attenuated in rhTM-treated septic rats compared to placebo-treated rats, as attested by a significant decrease in procoagulant annexin A5+-MVs and plasma procoagulant activity of phospholipids and by a significant increase in antithrombin levels (84 ± 8 vs. 64 ± 6%, p < 0.05), platelet count (582 ± 157 vs. 319 ± 91 × 109/L, p < 0.05) and fibrinolysis activity borne by MVs (2.9 ± 0.26 vs. 0.48 ± 0.29 U/mL urokinase, p < 0.05). Lung histological injury score showed significantly less leukocyte infiltration. Decreased procoagulant activity and lung injury were concomitant with decreased leukocyte activation as attested by plasma leukocyte-derived MVs and NETosis reduction after rhTM treatment (neutrophil elastase/DNA: 93 ± 33 vs. 227 ± 48 and citrullinated histones H3/DNA: 96 ± 16 vs. 242 ± 180, mOD for 109 neutrophils/L, p < 0.05).

Conclusion

Thrombomodulin limits procoagulant responses and NETosis and at least partly restores hemostasis control during immunothrombosis. Neutrophils might thus stand as a promising therapeutic target in septic shock-induced coagulopathy.
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Metadata
Title
Thrombomodulin favors leukocyte microvesicle fibrinolytic activity, reduces NETosis and prevents septic shock-induced coagulopathy in rats
Authors
Julie Helms
Raphaël Clere-Jehl
Elsa Bianchini
Pierrick Le Borgne
Mélanie Burban
Fatiha Zobairi
Jean-Luc Diehl
Lelia Grunebaum
Florence Toti
Ferhat Meziani
Delphine Borgel
Publication date
01-12-2017
Publisher
Springer International Publishing
Published in
Annals of Intensive Care / Issue 1/2017
Electronic ISSN: 2110-5820
DOI
https://doi.org/10.1186/s13613-017-0340-z

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