Artery Research

Volume 12, Issue C, December 2015, Pages 4 - 5

P1.9 PLATELET-LOCALIZED FXI PROMOTES A GLYCOPROTEIN IBα DEPENDENT FEEDBACK LOOP IN ARTERIAL HYPERTENSION AND VASCULAR INFLAMMATION

Authors
Jeremy Lagrange*1, Sabine Kossmann1, 2, Moritz Ehlken1, 2, Brett Monia3, Wolfram Ruf1, Philip Wenzel1, 2
1Center for Thrombosis and Hemostasis, Mainz, Germany
2Department of Medicine 2 University Medical Center, Mainz, Germany
3ISIS Pharmaceuticals Inc, Gazelle Court Carlsbad, USA
Available Online 23 November 2015.
DOI
https://doi.org/10.1016/j.artres.2015.10.201How to use a DOI?
Abstract

Background: Interactions of platelets, leukocytes and the vessel wall play pivotal roles in activating coagulation and precipitating thrombosis. High levels of angiotensin II (ATII) cause arterial hypertension by a complex inflammatory pathway requiring leukocyte recruitment and reactive oxygen species production within the vessel wall.

Objective: The aim of this work was to explore the role of platelet glycoprotein Ibα dependent thrombin-FXI feedback loop in arterial hypertension.

Methods: FXII−/−, FXI−/−, and hIL-4R/Ibα mice and 5/6 nephrectomized rats were used for this study. Mice where treated with ATII (1mg/kg−1/d−1 for 7 days) using osmotic minipumps. Blood pressure was recorded using tail cuff measurement and telemetry carotid implants. Vascular reactivity was assessed in isolated aortic segment, and thrombin generation was measured using calibrated automated thrombography.

Results: ATII induces an upregulation of tissue factor, thrombin-dependent endothelial cell VCAM-1 expression and integrin α4- and platelet-dependent leukocyte adhesion to arterial conductance vessels. The resulting vascular dysfunction unexpectedly involved the activation of FXI but not FXII. The platelet FXI receptor glycoprotein Ibα supports the upregulation of thrombin feedback activation in ATII-treated mice. Importantly, pharmacologic inhibition of FXI synthesis is sufficient to prevent thrombin propagation on platelets, to reduce vessel wall leukocyte infiltration, and to diminish ATII-induced endothelial dysfunction and arterial hypertension in mice and rats.

Conclusion: Our results reveal a critical role of platelet GPIbα to promote localized thrombin amplification and a FXI-thrombin feedback loop in ATII-induced vascular inflammation. Targeting FXI could be a novel therapeutic possibility to interrupt this heterotypic cellular coagulation-inflammatory circuit.

Open Access
This is an open access article distributed under the CC BY-NC license.

Journal
Artery Research
Volume-Issue
12 - C
Pages
4 - 5
Publication Date
2015/11
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
https://doi.org/10.1016/j.artres.2015.10.201How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - JOUR
AU  - Jeremy Lagrange*
AU  - Sabine Kossmann
AU  - Moritz Ehlken
AU  - Brett Monia
AU  - Wolfram Ruf
AU  - Philip Wenzel
PY  - 2015
DA  - 2015/11
TI  - P1.9 PLATELET-LOCALIZED FXI PROMOTES A GLYCOPROTEIN IBα DEPENDENT FEEDBACK LOOP IN ARTERIAL HYPERTENSION AND VASCULAR INFLAMMATION
JO  - Artery Research
SP  - 4
EP  - 5
VL  - 12
IS  - C
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2015.10.201
DO  - https://doi.org/10.1016/j.artres.2015.10.201
ID  - Lagrange*2015
ER  -