Duchenne muscular dystrophy (DMD) is an X-linked progressive muscle disorder, caused by mutations in the Dystrophin gene. Cardiomyopathy is one of the major causes of early death. In this study, we used DMD patient-specific induced pluripotent stem cells (iPSCs) to model cardiomyopathic features in DMD and unravel novel pathological mechanistic insights. Cardiomyocytes (CMs) differentiated from DMD iPSCs showed enhanced premature cell death, due to significantly elevated intracellular reactive oxygen species (ROS) concentrations, as a result of depolarized mitochondria and high NADPH oxidase 4 (NOX4) protein levels. Genetic correction of Dystrophin through CRISPR/Cas9 editing restored normal ROS levels. Application of ROS reduction by N-acetyl-L-cysteine (NAC), partial Dystrophin re-expression by ataluren (PTC124) and enhancing mitochondrial electron transport chain function by idebenone improved cell survival of DMD iPSC-CMs. We show applications that could counteract the detrimental oxidative stress environment in DMD iPSC-CMs by stimulating adenosine triphosphate (ATP) production. ATP could bind to the ATP-binding domain in the NOX4 enzyme, and we demonstrate that ATP resulted in partial inhibition of the NADPH-dependent ROS...Continue Reading
Cardiomyopathy is a disease of the heart muscle, that can lead to muscular or electrical dysfunction of the heart. It is often an irreversible disease that is associated with a poor prognosis. There are different causes and classifications of cardiomyopathies. Here are the latest discoveries pertaining to this disease.
BioRxiv and MedRxiv are the preprint servers for biology and health sciences respectively, operated by Cold Spring Harbor Laboratory. Here are the latest preprint articles (which are not peer-reviewed) from BioRxiv and MedRxiv.