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Contribution of platelet CX(3)CR1 to platelet-monocyte complex formation and vascular recruitment during

Otilia Postea1, Elena M Vasina, Sandra Cauwenberghs

  • 1Institute for Cardiovascular Prevention, Ludwig-Maximilians-University of Munich, Munich, Germany.

Arteriosclerosis, Thrombosis, and Vascular Biology
|March 3, 2012
PubMed

Insights

Platelets express increased CX3CR1 in hyperlipidemia, promoting monocyte adhesion and accumulation at arterial injury sites. This CX3CR1-fractalkine pathway is crucial in atherosclerosis development.

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Vascular Inflammation

Background:

  • The chemokine receptor CX3CR1 (fractalkine receptor) mediates inflammatory responses in vascular diseases.
  • On platelets, CX3CR1 ligation by fractalkine (CX3CL1) promotes platelet activation and leukocyte recruitment.

Purpose of the Study:

  • To investigate the expression and function of platelet CX3CR1 in hyperlipidemia and vascular injury models.

Main Methods:

  • Analysis of CX3CR1 mRNA and protein levels on platelets using RT-PCR, qPCR, FACS, and Western blot.
  • In vitro studies on monocyte adhesion to smooth muscle cells.
  • In vivo assessment of platelet adhesion to denuded vessel walls in mice.

Main Results:

  • Elevated CX3CR1 expression and increased CX3CL1 binding were observed on activated human platelets.
  • Platelet-CX3CR1 mediated the formation of platelet-monocyte complexes.
  • Hyperlipidemic mice showed increased platelet CX3CR1 expression, CX3CL1 binding, and circulating platelet-monocyte complexes.
  • CX3CR1-deficient platelets exhibited reduced adhesion to injured vessel walls in vivo.

Conclusions:

  • Platelets from hyperlipidemic mice exhibit heightened CX3CR1 expression and increased association with monocytes.
  • The CX3CL1-CX3CR1 axis plays a significant role in platelet accumulation and monocyte recruitment at sites of arterial injury.
  • This pathway is implicated in the pathogenesis of atherosclerosis.
Abstract

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