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Platelet microparticles reprogram macrophage gene expression and function.
Benoit Laffont, Aurélie Corduan, Matthieu Rousseau
1Dr. Patrick Provost, CHUQ Research Center/CHUL, 2705 Blvd Laurier, Room T1-65, Quebec, QC G1V 4G2, Canada, Tel.: +1 418 525 4444 (ext. 48842),
Thrombosis and Haemostasis
|September 4, 2015
Summary
Platelet microparticles deliver functional miR-126-3p to macrophages, altering their gene expression and promoting a phagocytic phenotype. This study reveals a novel mechanism of intercellular communication influencing immune cell function.
Area of Science:
- Cell Biology
- Immunology
- Molecular Biology
Background:
- Platelet microparticles (MPs) are abundant in circulation and mediate intercellular communication.
- MPs carry bioactive molecules like cytokines, proteins, lipids, and RNAs.
Purpose of the Study:
- To investigate the internalization of platelet MPs by macrophages.
- To determine the functional consequences of platelet MP delivery of miR-126-3p to macrophages.
Main Methods:
- Primary human macrophages were exposed to platelet MPs.
- Microarray analysis was used to assess global changes in microRNA and RNA expression.
- Functional assays measured cytokine release and phagocytic capacity.
Main Results:
- Platelet MPs were internalized by macrophages, delivering functional miR-126-3p.
- miR-126-3p from platelet MPs downregulated target mRNA and protein expression.
- Platelet MP exposure reprogrammed macrophage transcriptome, upregulating 34 microRNAs and downregulating 367 RNAs.
- Macrophages showed reduced CCL4, CSF1, and TNF release and increased phagocytic capacity.
Conclusions:
- Platelet MPs reprogram macrophage function via miR-126-3p delivery.
- This interaction shifts macrophages towards a phagocytic phenotype.
- Platelet MPs represent a significant mechanism for modulating macrophage immune responses.
