MiRNA-21 is Dysregulated in Response to Vein Grafting in Multiple Models and Genetic Ablation in Mice Attenuates Neointima Formation

Overview

Journal Eur Heart J

Publisher Oxford University Press

Specialty Cardiology & Vascular Diseases

Date 2013 Mar 27

PMID 23530023

Citations 37

Authors

Robert A McDonald

Katie M White

Junxi Wu

Brian C Cooley

Keith E Robertson

Crawford A Halliday

John D McClure

Sheila Francis

Ruifaug Lu

Simon Kennedy

Sarah J George

Song Wan

Eva Van Rooij

Andrew H Baker

Affiliations

Soon will be listed here.

Abstract

Aims: The long-term failure of autologous saphenous vein bypass grafts due to neointimal thickening is a major clinical burden. Identifying novel strategies to prevent neointimal thickening is important. Thus, this study aimed to identify microRNAs (miRNAs) that are dysregulated during neointimal formation and determine their pathophysiological relevance following miRNA manipulation.

Methods And Results: We undertook a microarray approach to identify dysregulated miRNAs following engraftment in an interpositional porcine graft model. These profiling experiments identified a number of miRNAs which were dysregulated following engraftment. miR-21 levels were substantially elevated following engraftment and these results were confirmed by quantitative real-time PCR in mouse, pig, and human models of vein graft neointimal formation. Genetic ablation of miR-21 in mice or grafted veins dramatically reduced neointimal formation in a mouse model of vein grafting. Furthermore, pharmacological knockdown of miR-21 in human veins resulted in target gene de-repression and a significant reduction in neointimal formation.

Conclusion: This is the first report demonstrating that miR-21 plays a pathological role in vein graft failure. Furthermore, we also provided evidence that knockdown of miR-21 has therapeutic potential for the prevention of pathological vein graft remodelling.

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