Fractalkine – a local inflammatory marker aggravating platelet activation at the vulnerable plaque

Ulrike Flierl; Andreas Schäfer

doi:10.1160/TH12-04-0271

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2012; 108(03): 457-463
DOI: 10.1160/TH12-04-0271

Theme Issue Article

Schattauer GmbH

Fractalkine – a local inflammatory marker aggravating platelet activation at the vulnerable plaque

Ulrike Flierl

¹Klinik für Kardiologie und Angiologie, Medizinische Hochschule Hannover, Germany

,

Andreas Schäfer

¹Klinik für Kardiologie und Angiologie, Medizinische Hochschule Hannover, Germany

› Author Affiliations

Abstract

Summary

Chemokines play an important role in inducing chemotaxis of cells, piloting white blood cells in immune surveillance and are crucial parts in the development and progression of atherosclerosis. Platelets are mandatory players in the initiation of atherosclerotic lesion formation and are susceptible targets for and producers of chemokines. Several chemokine receptors on platelets have been described previously, amongst them CX₃CR1, the receptor for fractalkine. The unique chemokine fractalkine (CX₃CL1, FKN) exists as a soluble as well as a membrane-anchored glycoprotein. Its essential role in the formation of atherosclerotic lesions and atherosclerosis progression has been impressively described in mouse models. Moreover, fractalkine induces platelet activation and adhesion via a functional fractalkine receptor (CX₃CR1) expressed on the platelet surface. Platelet activation via the FKN/CX₃CR1-axis triggers leukocyte adhesion to activated endothelium, and fractalkine-induced platelet P-selectin is mandatory for leukocyte recruitment under arterial flow conditions. This review summarises the role of fractalkine as a potential local inflammatory mediator which influences platelet activation in the setting of atherosclerosis. Beyond that, aspects of a potential interaction between fractalkine and platelet responsiveness to antiplatelet drugs are described. Furthermore, the possible impact of high-density lipoprotein cholesterol (HDL-C) on atherosclerosis progression, platelet activation and fractalkine signalling are discussed.

Keywords

Fractalkine - platelet activation - atherosclerosis - HDL

Full Text

References

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