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

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Affiliations

  • 1. Centre Hospitalier Universitaire de Québec Research Center/Centre Hospitalier de l'Université Laval, Quebec, Canada.
      Authors
    • Laffont B 1
    (1 author)

ORCIDs linked to this article

Blood, 07 May 2013, 122(2):253-261
https://doi.org/10.1182/blood-2013-03-492801 PMID: 23652806 

A comment on this article appears in "Platelets deliver small packages of genetic function." Blood. 2013 Jul 11;122(2):155-6.

Abstract 

Platelets play a crucial role in the maintenance of hemostasis, as well as in thrombosis. Upon activation, platelets release small membrane-bound microparticles (MPs) containing bioactive proteins and genetic materials from their parental cells that may be transferred to, and exert potent biological effects in, recipient cells of the circulatory system. Platelets have been shown to contain an abundant and diverse array of microRNAs, and platelet-derived MPs are the most abundant microvesicles in the circulation. Here we demonstrate that human platelets activated with thrombin preferentially release their miR-223 content in MPs. These MPs can be internalized by human umbilical vein endothelial cells (HUVEC), leading to the accumulation of platelet-derived miR-223. Platelet MPs contain functional Argonaute 2 (Ago2)•miR-223 complexes that are capable of regulating expression of a reporter gene in recipient HUVEC. Moreover, we demonstrate a role for platelet MP-derived miR-223 in the regulation of 2 endogenous endothelial genes, both at the messenger RNA and protein levels. Our results support a scenario by which platelet MPs may act as intercellular carriers of functional Ago2•microRNA complexes that may exert heterotypic regulation of gene expression in endothelial cells, and possibly other recipient cells of the circulatory system.

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Read article at publisher's site: https://doi.org/10.1182/blood-2013-03-492801

Read article for free, from open access legal sources, via Unpaywall: http://www.bloodjournal.org/content/bloodjournal/122/2/253.full.pdfUnpaywall

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Funding 

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Canadian Institutes of Health Research (2)