Key result
Fetal microRNA reactivation alters cardiac gene expression and induces cellular hypertrophy in heart failure.
Why the study?
The underlying mechanisms of left ventricular remodeling and reactivation of a fetal gene program in chronic heart failure are only partly understood, including whether cardiac microRNAs contribute to these transcriptional changes.
Reactivation of a fetal microRNA program contributes to the transcriptional changes and cellular hypertrophy observed in the failing human heart.
Answers are grounded in this paper and cite their sources.
May inform microRNA-targeted HF therapies; leaves open clinical translation from human tissue findings.
BACKGROUND: Chronic heart failure is characterized by left ventricular remodeling and reactivation of a fetal gene program; the underlying mechanisms are only partly understood. Here we provide evidence that cardiac microRNAs, recently discovered key regulators of gene expression, contribute to the transcriptional changes observed in heart failure. METHODS AND RESULTS: Cardiac transcriptome analyses revealed striking similarities between fetal and failing human heart tissue. Using microRNA arrays, we discovered profound alterations of microRNA expression in failing hearts. These changes closely mimicked the microRNA expression pattern observed in fetal cardiac tissue. Bioinformatic analysis demonstrated a striking concordance between regulated messenger RNA expression in heart failure and the presence of microRNA binding sites in the respective 3' untranslated regions. Messenger RNAs upregulated in the failing heart contained preferentially binding sites for downregulated microRNAs and vice versa. Mechanistically, transfection of cardiomyocytes with a set of fetal microRNAs induced cellular hypertrophy as well as changes in gene expression comparable to the failing heart. CONCLUSIONS: Our data support a novel mode of regulation for the transcriptional changes in cardiac failure. Reactivation of a fetal microRNA program substantially contributes to alterations of gene expression in the failing human heart.
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Thum et al. (2007) studied Chronic heart failure. Reactivation of a fetal microRNA program in failing human hearts substantially contributes to alterations of gene expression and induces cellular hypertrophy.
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