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miR-486 is modulated by stretch and increases ventricular growth.

08:00 EDT 12th September 2019 | BioPortfolio

Summary of "miR-486 is modulated by stretch and increases ventricular growth."

Perturbations in biomechanical stimuli during cardiac development contribute to congenital cardiac defects such as Hypoplastic Left Heart Syndrome (HLHS). This study sought to identify stretch-responsive pathways involved in cardiac development. microRNA (miRNA)-Sequencing identified miR-486 as being increased in cardiomyocytes exposed to cyclic stretch in vitro (63%, p<0.002). The right ventricles of HLHS patients experience increased stretch and have a trend towards higher miR-486 levels 4.9-fold (p=0.08). Sheep RVs dilated from excessive pulmonary blood flow have 60% more miR-486 vs. control RVs (p<0.05). The left ventricles of newborn mice treated with miR-486 mimic are 16.9%-24.6% larger (p<0.01) and display 2.48 fold increase in cardiomyocyte proliferation (p<0.01). miR-486 treatment decreases FoxO1 and Smad signaling, while increasing the protein levels of Stat1. Stat1 associates with Gata4 and Serum Response Factor (Srf), two key cardiac transcription factors whose protein levels increase in response to miR-486. This is the first report of a stretch-responsive miRNA that increases the growth of the ventricle in vivo.

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This article was published in the following journal.

Name: JCI insight
ISSN: 2379-3708
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