| First Author | Hou L | Year | 2018 |
| Journal | Basic Res Cardiol | Volume | 113 |
| Issue | 4 | Pages | 28 |
| PubMed ID | 29892894 | Mgi Jnum | J:311960 |
| Mgi Id | MGI:6781066 | Doi | 10.1007/s00395-018-0685-y |
| Citation | Hou L, et al. (2018) Cardiomyocyte dimethylarginine dimethylaminohydrolase1 attenuates left-ventricular remodeling after acute myocardial infarction: involvement in oxidative stress and apoptosis. Basic Res Cardiol 113(4):28 |
| abstractText | Asymmetric dimethylarginine (ADMA) is a risk factor for heart diseases. Dimethylarginine dimethylaminohydrolase (DDAH) enzymes are key proteins for ADMA degradation. Endothelial DDAH1 is a vital regulator of angiogenesis. DDAH1 is also expressed in cardiomyocytes. However, the role of DDAH1 in cardiomyocytes needs further clarification. Herein, we used an inducible cardiac-specific DDAH1 knockdown mouse (cardiac DDAH1(-/-)) to investigate the role of cardiomyocyte DDAH1 in left-ventricular (LV) remodeling after acute myocardial infarction (AMI). DDAH1flox/flox and alpha-MHC(MerCreMer) mice were used to generate cardiac DDAH1(-/-) mice. Deletion of DDAH1 in cardiomyocytes was confirmed by Western blotting. No significant differences were observed in plasma ADMA levels and LV function between cardiac DDAH1(-/-) mice and control mice. Cardiac DDAH1(-/-) mice showed aggravated LV remodeling 4 weeks after AMI, as demonstrated by a large infarct area and impaired LV function. The rate of cardiomyocyte apoptosis and level of oxidative stress were higher in the LV tissue of cardiac DDAH1(-/-) mice than in that of control mice. However, treatment of cardiomyocytes with exogenous ADMA had no effect on reactive oxygen species (ROS) levels or apoptosis sensitivity. Cardiac DDAH1(-/-) LV tissue showed downregulated superoxide dismutase2 (SOD2) expression, and treatment of DDAH1(-/-) cardiomyocytes with the SOD mimic tempol significantly attenuated apoptosis and ROS levels under hypoxic conditions. Tempol administration also attenuated oxidative stress and apoptosis in cardiac DDAH1(-/-) LV tissue and partially alleviated LV remodeling after AMI. DDAH1 in cardiomyocytes plays a vital role in attenuating LV remodeling after AMI by regulating intracellular ROS levels and apoptosis sensitivity via a SOD2-dependent pathway. |
