Mitochondrial CaMKII causes adverse metabolic reprogramming and dilated cardiomyopathy.

ABSTRACT: Despite the clear association between myocardial injury, heart failure and depressed myocardial energetics, little is known about upstream signals responsible for remodeling myocardial metabolism after pathological stress. Here, we report increased mitochondrial calmodulin kinase II (CaMKII) activation and left ventricular dilation in mice one week after myocardial infarction (MI) surgery. By contrast, mice with genetic mitochondrial CaMKII inhibition are protected from left ventricular dilation and dysfunction after MI. Mice with myocardial and mitochondrial CaMKII overexpression (mtCaMKII) have severe dilated cardiomyopathy and decreased ATP that causes elevated cytoplasmic resting (diastolic) Ca²⁺ concentration and reduced mechanical performance. We map a metabolic pathway th

SUBMITTER: Luczak ED 

PROVIDER: S-EPMC7473864 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature