miR-126-3p Promotes Matrix-Dependent Perivascular Cell Attachment, Migration and Intercellular Interaction

Area of Science:

• Vascular biology
• Cellular and molecular biology

Background:

• MicroRNAs (miRNAs) are key regulators of cell interactions.
• The specific miRNAs involved in perivascular cell (PVC) and endothelial cell (EC) communication during angiogenesis are not fully understood.

Purpose of the Study:

• To identify PVC-specific miRNAs involved in angiogenesis.
• To elucidate the functional and molecular mechanisms of these miRNAs in regulating PVC-EC interactions and vascular integrity.

Main Methods:

• Identification of upregulated miRNAs in PVCs upon EC interaction.
• In vitro assays to assess PVC phenotype, motility, and EC network stabilization.
• miRNA target analysis to identify downstream molecular pathways.
• In vivo experiments to evaluate the effect of miRNA gain of expression on vascular maturation.

Main Results:

• miR-126-3p and miR-146a were exclusively upregulated in PVCs interacting with ECs.
• Increased miR-126-3p significantly enhanced PVC motility and stabilized EC networks.
• miR-126-3p targets SPRED1 and PLK2, influencing ERK1/2 phosphorylation and TLR3 expression.
• In vivo, miR-126-3p promoted PVC coverage of new vessels and enhanced vascular maturity and reduced permeability.

Conclusions:

• miR-126-3p plays a crucial role in regulating matrix-dependent PVC migration and intercellular interactions.
• This miRNA modulates vascular integrity by influencing cell-cell and cell-matrix contacts.
• The findings highlight miR-126-3p as a key regulator of angiogenesis and vascular maturation.