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PLoS One. 2012;7(7):e41574. doi: 10.1371/journal.pone.0041574. Epub 2012 Jul 23.

Micro-RNA-195 and -451 regulate the LKB1/AMPK signaling axis by targeting MO25.

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  • 1Department of Physiology, University of Arizona, Tucson, Arizona, United States of America.

Abstract

BACKGROUND:

Recently, MicroRNAs (miR) and AMP-kinase (AMPK) have emerged as prominent players in the development of cardiac hypertrophy and heart failure. We hypothesized that components of the adenosine monophosphate-activated kinase (AMPK) pathway are targeted by miRs and alter AMPK signaling during pathological cardiac stress.

METHODOLOGY/PRINCIPAL FINDINGS:

Using a mouse model of hypertrophic cardiomyopathy (HCM), we demonstrated early elevation of miR-195 and miR-451 in HCM hearts, which targets MO25, a central component of the MO25/STRAD/LKB1 complex that acts as an upstream kinase for AMPK. We show functional targeting of MO25 by miR-195 and -451. Further in vitro interrogation of MO25 as a functional target validated this hypothesis where over-expression of miR-195 in C2C12 cells knocked down MO25 expression levels and downstream AMPK signaling (phosphorylation of Acetyl CoA carboxylase [ACC] and AMPK activity assay), similar to MO25 knockdown in C2C12 cells by siRNA. Parallel changes were measured in 60 day R403Q HCM male hearts that were rescued by short-term administration of AICAR, an AMPK agonist.

CONCLUSIONS/SIGNIFICANCE:

Elevated miR-195 targets the LKB1/AMPK signaling axis in HCM progression and implicates a functional role in HCM disease progression. MiR-195 may serve as potential therapeutics or therapeutic targets for heart disease.

PMID:
22844503
[PubMed - indexed for MEDLINE]
PMCID:
PMC3402395
Free PMC Article
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