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Front. Vet. Sci. | doi: 10.3389/fvets.2018.00291

A comparative review of neutrophil extracellular traps in sepsis

 Ronald H. Li1* and Fern Tablin1
  • 1School of Veterinary Medicine, University of California, Davis, United States

Sepsis is the leading cause of critical illness and mortality in human beings and animals. Neutrophils are the primary effector cells of innate immunity during sepsis. Besides degranulation and phagocytosis, neutrophils also release neutrophil extracellular traps (NETs), composed of cell-free DNA, histones and antimicrobial proteins. Although NETs have protective roles in the initial stages of sepsis, excessive NET formation has been found to induce thrombosis and multiple organ failure in murine sepsis models. Since the discovery of NETs nearly a decade ago, many investigators have identified NETs in various species. However, many questions remain regarding the exact mechanisms and fate of neutrophils following NET formation. In humans and mice, platelet-neutrophil interactions via direct binding or soluble mediators seem to play an important role in mediating NET formation during sepsis. Preliminary data suggest that these interactions may be species dependent. Regardless of these differences, there is increasing evidence in human and veterinary medicine suggesting that NETs play a crucial role in the pathogenesis of intravascular thrombosis and multiple organ failure in sepsis. Because the outcome of sepsis is highly dependent on early recognition and intervention, detection of NETs or NET components can aid in the diagnosis of sepsis in humans and veterinary species. In addition, the use of novel therapies such as deoxyribonuclease and non-anticoagulant heparin to target NET components shows promising results in murine septic models. Much work is needed in translating these NET-targeting therapies to clinical practice.

Keywords: citrullinated histones, Acute respiratory distress syndrome (ARDS), immunothrombosis, Veterinary critical care, platelet-neutrophil interaction

Received: 27 Aug 2018; Accepted: 31 Oct 2018.

Edited by:

Soren R. Boysen, University of Calgary, Canada

Reviewed by:

Jo-Annie Letendre, Other
Iain Keir, Allegheny Veterinary Emergency Trauma & Specialty, United States  

Copyright: © 2018 Li and Tablin. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Ronald H. Li, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616, California, United States, rhli@ucdavis.edu