Affiliation:
1. Department of Physical and Rehabilitation Medicine Tianjin Medical University General Hospital Tianjin China
2. Department of Biopharmaceutics, Tianjin Key Laboratory of Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy Tianjin Medical University Tianjin China
3. Department of Cardiovascular Surgery Tianjin Medical University General Hospital Tianjin China
4. School of Clinial Medicine Tianjin Medical University Tianjin China
Abstract
AbstractAerobic training (AT), an effective form of cardiac rehabilitation, has been shown to be beneficial for cardiac repair and remodeling after myocardial infarction (MI). The p300/CBP‐associated factor (PCAF) is one of the most important lysine acetyltransferases and is involved in various biological processes. However, the role of PCAF in AT and AT‐mediated cardiac remodeling post‐MI has not been determined. Here, we found that the PCAF protein level was significantly increased after MI, while AT blocked the increase in PCAF. AT markedly improved cardiac remodeling in mice after MI by reducing endoplasmic reticulum stress (ERS). In vivo, similar to AT, pharmacological inhibition of PCAF by Embelin improved cardiac recovery and attenuated ERS in MI mice. Furthermore, we observed that both IGF‐1, a simulated exercise environment, and Embelin protected from H2O2‐induced cardiomyocyte injury, while PCAF overexpression by viruses or the sirtuin inhibitor nicotinamide eliminated the protective effect of IGF‐1 in H9C2 cells. Thus, our data indicate that maintaining low PCAF levels plays an essential role in AT‐mediated cardiac protection, and PCAF inhibition represents a promising therapeutic target for attenuating cardiac remodeling after MI.