objective(s):the objective of this study was to investigate the interaction of daunorubicin (dnr) and cardiac myosin (cm) and the changes in mice hearts to exhibit dnr-induced cardiotoxicity . materials and methods:the interaction between dnr and cm was expressed using fluorescence quenching at ph 4.0-9.0 and 15-37 °c. dnr-induced cardiotoxicity was studied using in vivo experiment.  forty grou...

background: hypertrophic cardiomyopathy is a genetic disorder with a prevalence rate of 0.2% in the general population. it comes from mutations in sarcomeric proteins. cardiac myosin-binding protein c3 is one of the critical genes in hypertrophic cardiomyopathy (hcm) and sudden cardiac death, accounting for about 20% of hcm-causing mutations. genetic testing is recommended in patients with hcm....

The selective cardiac myosin activator omecamtiv mecarbil has been shown to improve function in patients with heart failure a reduced ejection fraction. Its effect on cardiovascular outcomes is unknown.

Cardiac myosin obtained from rats and mice (smaller animals) had a higher adenosinetriphosphatase (ATPase) activity in the presence of calcium ions (Ca) than did cardiac myosin from rabbits and dogs (larger animals). Structural differences between the two types of cardiac myosin were suggested by the lower apparent activation energy of the Caactivated ATPase reaction catalyzed by cardiac myosin...

Key points Direct binding of rumenic acid to the cardiac myosin‐2 motor domain increases release rate for orthophosphate and Ca 2+ responsiveness muscle at low load. Physiological cellular concentrations affect ATP turnover rates super‐relaxed disordered relaxed states β‐cardiac myosin, leading a net increase in myocardial metabolic In ‐activated trabeculae, exerts direct inhibitory effect on f...

Cardiac myosin prepared by any one of a number of modifications of the basic Szent-Gyorgyi method and cardiac myosin prepared by the lithium chloride-ammonium sulfate technique differ in two important respects: 1) SzentGyorgyi-prepared myosin solutions are inhomogeneous by both chemical and immunologic criteria; 2) the ATPase activity of Szent-Gyorgyi-prepared myosin is low in comparison to lit...

Trypanosoma cruzi is the protozoan parasite that causes Chagas' heart disease, a potentially fatal cardiomyopathy prevalent in Central and South America. Infection with T. cruzi induces cardiac myosin autoimmunity in susceptible humans and mice, and this autoimmunity has been suggested to contribute to cardiac inflammation. To address how T. cruzi induces cardiac myosin autoimmunity, we investi...

Cardiac myosin prepared by any one of a number of modifications of the basic Szent-Gyorgyi method and cardiac myosin prepared by the lithium chloride-ammonium sulfate technique differ in two important respects: 1) SzentGyorgyi-prepared myosin solutions are inhomogeneous by both chemical and immunologic criteria; 2) the ATPase activity of Szent-Gyorgyi-prepared myosin is low in comparison to lit...

Cardiac muscle performance can be determined by factors intrinsic to each cardiac muscle cell, such as protein isoform expression. One protein whose expression plays a major role in determining cardiac performance is myosin. Myosin is the heart's molecular motor which transduces the chemical energy from ATP hydrolysis into the mechanical energy of each heartbeat. Alterations of myosin isoform e...