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Endotoxaemia-augmented murine venous thrombosis is dependent on TLR-4 and ICAM-1, and potentiated by neutropenia

Journal: Thrombosis and Haemostasis
ISSN: 0340-6245
DOI: https://doi.org/10.1160/TH16-03-0218
Issue: 2017: Issue 2 2017 (pp. 207-428)
Pages: 339-348
Ahead of Print: 2016-12-15

Endotoxaemia-augmented murine venous thrombosis is dependent on TLR-4 and ICAM-1, and potentiated by neutropenia

Online Supplementary Material

A. T. Obi (1), E. Andraska (1, 2), Y. Kanthi (3), C. W. Kessinger (4), M. Elfline (1), C. Luke (1), T. J. Siahaan (5), F. A. Jaffer (4), T. W. Wakefield (1), P. K. Henke (1)

(1) Conrad Jobst Vascular Research Laboratory, Section of Vascular Surgery, Department of Surgery, University of Michigan, Ann Arbor, Michigan, USA; (2) University of Michigan Medical School, Ann Arbor, Michigan, USA; (3) Department of Cardiology, University of Michigan, Ann Arbor, Michigan, USA; (4) Cardiovascular Research Center, Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA; (5) School of Pharmacology, University of Kansas, Lawrence, Kansas, USA

Keywords

venous thromboembolism, Venous thrombosis, sepsis, TLR4, ICAM-1, cellular adhesion molecules, LPS

Summary

Venous thromboembolism is a major cause of death during and immediately post-sepsis. Venous thrombosis (VT) is mediated by cell adhesion molecules and leukocytes, including neutrophil extracellular traps (NETs). Sepsis, or experimentally, endotoxaemia, shares similar characteristics and is modulated via toll like receptor 4 (TLR4). This study was undertaken to determine if endotoxaemia potentiates early stasis thrombogenesis, and secondarily to determine the role of VT TLR4, ICAM-1 and neutrophils (PMNs). Wild-type (WT), ICAM-1-/- and TLR4-/- mice underwent treatment with saline or LPS (10 mg/kg i. p.) alone, or followed by inferior vena cava (IVC) ligation to generate stasis VT. In vivo microscopy of leukocyte trafficking was performed in non-thrombosed mice, and tissue and plasma were harvested during early VT formation. Pre-thrombosis, circulating ICAM-1 was elevated and increased leukocyte adhesion and rolling occurred on the IVC of LPS-treated mice. Post-thrombosis, endotoxaemic mice formed larger, platelet-poor thrombi. Endotoxaemic TLR4-/- mice did not have an augmented thrombotic response and exhibited significantly decreased circulating ICAM-1 compared to endotoxaemic WT controls. Endotoxaemic ICAM-1-/- mice had significantly smaller thrombi compared to controls. Hypothesising that PMNs localised to the inflamed endothelium were promoting thrombosis, PMN depletion using anti-Ly6G antibody was performed. Paradoxically, VT formed without PMNs was amplified, potentially related to endotoxaemia induced elevation of PAI-1 and circulating FXIII, and decreased uPA. Endotoxaemia enhanced early VT occurs in a TLR-4 and ICAM-1 dependent fashion, and is potentiated by neutropenia. ICAM-1 and/or TLR-4 inhibition may be a unique strategy to prevent sepsis-associated VT.

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