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Activated platelets can deliver mRNA regulatory Ago2•microRNA complexes to endothelial cells via microparticles

Benoit Laffont1, Aurélie Corduan, Hélène Plé

  • 1Centre Hospitalier Universitaire de Québec Research Center/Centre Hospitalier de l'Université Laval, Quebec, Canada.

Blood
|May 9, 2013
PubMed

Insights

Platelet microparticles (MPs) carry functional microRNA-223 (miR-223) that regulates gene expression in endothelial cells. This discovery highlights MPs as key intercellular communicators in the circulatory system.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Hematology

Background:

  • Platelets are vital for hemostasis and thrombosis.
  • Activated platelets release microparticles (MPs) containing bioactive molecules.
  • Platelet-derived MPs are abundant in circulation and carry genetic material.

Purpose of the Study:

  • To investigate the release and function of microRNA-223 (miR-223) from activated human platelets.
  • To determine if platelet MPs can transfer functional miR-223 to endothelial cells.
  • To explore the role of platelet MP-derived miR-223 in regulating endothelial gene expression.

Main Methods:

  • Human platelet activation with thrombin.
  • Isolation and characterization of platelet-derived MPs.
  • Internalization studies using human umbilical vein endothelial cells (HUVEC).
  • Analysis of Argonaute 2 (Ago2)•miR-223 complexes and gene expression (mRNA and protein levels).

Main Results:

  • Thrombin-activated platelets preferentially release miR-223 within MPs.
  • HUVEC internalized platelet MPs, accumulating platelet-derived miR-223.
  • Platelet MPs delivered functional Ago2•miR-223 complexes capable of regulating reporter gene expression.
  • Platelet MP-derived miR-223 regulated two endogenous endothelial genes at mRNA and protein levels.

Conclusions:

  • Platelet MPs serve as intercellular carriers of functional Ago2•microRNA complexes.
  • Platelet MPs facilitate heterotypic gene regulation in recipient endothelial cells.
  • This mechanism may extend to other cell types within the circulatory system.

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