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Integrative Physiology |
From the Cardiovascular Research Institute, Department of Cell Biology and Molecular Medicine, University of Medicine and Dentistry of New Jersey, Newark.
Correspondence to Maha Abdellatif, Cardiovascular Research Institute, Department of Cell Biology and Molecular Medicine, University of Medicine and Dentistry of New Jersey, Newark, NJ 07103. E-mail abdellma{at}umdnj.edu
MicroRNAs are naturally existing, small, noncoding RNA molecules that downregulate posttranscriptional gene expression. Their expression pattern and function in the heart remain unknown. Here we report an array of microRNAs that are differentially and temporally regulated during cardiac hypertrophy. Significantly, the muscle-specific microRNA-1 (miR-1) was singularly downregulated as early as day 1 (0.56±0.036), persisting through day 7 (0.29±0.14), after aortic constrictioninduced hypertrophy in a mouse model. Overexpression experiments showed that miR-1 inhibited its in silicopredicted, growth-related targets, including Ras GTPaseactivating protein (RasGAP), cyclin-dependent kinase 9 (Cdk9), fibronectin, and Ras homolog enriched in brain (Rheb), in addition to protein synthesis and cell size. Thus, we propose that microRNAs play an essential regulatory role in the development of cardiac hypertrophy, wherein downregulation of miR-1 is necessary for the relief of growth-related target genes from its repressive influence and induction of hypertrophy.
Key Words: microRNA cardiac hypertrophy microarray miR-1
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