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Differential contribution of FXa and thrombin to vascular inflammation in a mouse model of sickle cell disease

Blood. 2014 Mar 13;123(11):1747-56. doi: 10.1182/blood-2013-08-523936. Epub 2014 Jan 21.

Abstract

Activation of coagulation and vascular inflammation are prominent features of sickle cell disease (SCD). Previously, we have shown that inhibition of tissue factor (TF) attenuates activation of coagulation and vascular inflammation in mouse models of SCD. In this study, we examined the mechanism by which coagulation proteases enhance vascular inflammation in sickle BERK mice. To specifically investigate the contribution of FXa and thrombin, mice were fed chow containing either rivaroxaban or dabigatran, respectively. In addition, we used bone marrow transplantation to generate sickle mice deficient in either protease activated receptor-1 (PAR-1) or protease activated receptor-2 (PAR-2) on nonhematopoietic cells. FXa inhibition and PAR-2 deficiency in nonhematopoietic cells attenuated systemic inflammation, measured by plasma levels of interleukin-6 (IL-6). In contrast, neither thrombin inhibition nor PAR-1 deficiency in nonhematopoietic cells affected plasma levels of IL-6 in sickle mice. However, thrombin did contribute to neutrophil infiltration in the lung, independently of PAR-1 expressed by nonhematopoietic cells. Furthermore, the TF-dependent increase in plasma levels of soluble vascular cell adhesion molecule-1 in sickle mice was not mediated by FXa or thrombin. Our data indicate that TF, FXa, and thrombin differentially contribute to vascular inflammation in a mouse model of SCD.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Anemia, Sickle Cell / complications*
  • Anemia, Sickle Cell / genetics
  • Anemia, Sickle Cell / pathology
  • Animals
  • Anticoagulants / pharmacology
  • Antithrombins / pharmacology
  • Benzimidazoles / pharmacology
  • Bone Marrow Transplantation
  • Dabigatran
  • Disease Models, Animal*
  • Factor Xa / metabolism*
  • Factor Xa Inhibitors
  • Female
  • Immunoenzyme Techniques
  • Inflammation / etiology*
  • Inflammation / metabolism
  • Inflammation / pathology
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Morpholines / pharmacology
  • Receptor, PAR-1 / physiology
  • Receptor, PAR-2 / physiology
  • Rivaroxaban
  • Thiophenes / pharmacology
  • Thrombin / antagonists & inhibitors
  • Thrombin / metabolism*
  • Vascular Diseases / etiology*
  • Vascular Diseases / metabolism
  • Vascular Diseases / pathology
  • beta-Alanine / analogs & derivatives
  • beta-Alanine / pharmacology

Substances

  • Anticoagulants
  • Antithrombins
  • Benzimidazoles
  • Factor Xa Inhibitors
  • Morpholines
  • Receptor, PAR-1
  • Receptor, PAR-2
  • Thiophenes
  • beta-Alanine
  • Rivaroxaban
  • Thrombin
  • Factor Xa
  • Dabigatran