Myostatin, a member of the TGF-β superfamily of secreted growth factors, is a negative regulator of skeletal muscle growth. In the heart, it is expressed at lower levels compared to skeletal muscle but up-regulated under disease conditions. Cre recombinase-mediated inactivation of myostatin in adult cardiomyocytes leads to heart failure and increased mortality but cardiac function of surviving mice is restored after several weeks probably due to compensatory expression in non-cardiomyocytes. To study long-term effects of increased myostatin expression in the heart and to analyze the putative crosstalk between cardiomyocytes and fibroblasts, we overexpressed myostatin in cardiomyocytes. Increased expression of myostatin in heart muscle cells caused interstitial fibrosis via activation of the TAK-1-MKK3/6-p38 signaling pathway, compromising cardiac function in older mice. Our results uncover a novel role of myostatin in the heart and highlight the necessity for tight regulation of myostatin to maintain normal heart function.
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This work was supported by the Max Planck Society, the Excellence Initiative “Cardiopulmonary System”, the German Center for Cardiovascular Research (DZHK) and the Leducq Foundation.
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Biesemann, N., Mendler, L., Kostin, S. et al. Myostatin induces interstitial fibrosis in the heart via TAK1 and p38. Cell Tissue Res 361, 779–787 (2015). https://doi.org/10.1007/s00441-015-2139-2
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