Ageing is the predominant risk factor for cardiovascular diseases1 and contributes to a significantly worse outcome in patients with acute myocardial infarction2. MicroRNAs (miRNAs) have emerged as crucial regulators of cardiovascular function and some miRNAs have key roles in ageing3,4. We propose that altered expression of miRNAs in the heart during ageing contributes to the age-dependent decline in cardiac function. Here we show that miR-34a is induced in the ageing heart and that in vivo silencing or genetic deletion of miR-34a reduces age-associated cardiomyocyte cell death. Moreover, miR-34a inhibition reduces cell death and fibrosis following acute myocardial infarction and improves recovery of myocardial function. Mechanistically, we identified PNUTS (also known as PPP1R10) as a novel direct miR-34a target, which reduces telomere shortening, DNA damage responses and cardiomyocyte apoptosis, and improves functional recovery after acute myocardial infarction. Together, these results identify age-induced expression of miR-34a and inhibition of its target PNUTS as a key mechanism that regulates cardiac contractile function during ageing and after acute myocardial infarction, by inducing DNA damage responses and telomere attrition.
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Gene Expression Omnibus
Data are available at the National Center for Biotechnology Information Gene Expression Omnibus (GEO) and are accessible through GEO Series accession number GSE43556.
We thank M. Muhly-Reinholz, A. Knau, B. Zimmermann, N. Reinfeld and F. Gehring for technical assistance, F. W. Alt for providing SIRT1 mutant mice and D. Sassoon and G. Marazzi for conceptual advice. R.A.B. was supported by the Netherlands Organization for Scientific Research (NWO) and K.I. by a Research Grant Abroad of the Japanese Heart Foundation. This study was supported by a start-(Exc 147-1) to R.A.B., by the European Research Council (Advanced grant “Angiomirs”) and the German Center for Cardiovascular Research DZHK and the European Union FP7 project Endostem (Grant no. 241440) to S.D. H.A.K. and O.J.M. are supported by the German Centre for Cardiovascular Research (DZHK) and by the German Ministry of Education and Research (BMBF). M.P. is supported by the Max Planck Society, the Fondation Leducq (ARTEMIS) and an ERC Starting Grant (ANGIOMET). H.H. is supported by the DFG, the Deutsche Krebshilfe and the Rudolf-Bartling-Stiftung.