Cardiomyocyte calcium handling proteins

Cardiomyocyte calcium channels and transporters are a complex network of proteins responsible for maintaining calcium homeostasis and driving the heart's mechanical activity through excitation-contraction coupling (ECC) [5, 7]. This system includes the L-type calcium channel (primarily Cav1.2), which initiates calcium entry upon membrane depolarization [3, 8]. The ryanodine receptor 2 (RyR2) then triggers massive calcium release from the sarcoplasmic reticulum (SR) in a process known as calcium-induced calcium release [5, 13]. To allow for cardiac relaxation, the SERCA2a pump facilitates the sequestration of calcium back into the SR, while the sodium-calcium exchanger (NCX1) removes calcium from the cell [4, 9]. Dysregulation of these components, such as impaired SERCA2a activity or "leaky" RyR2 channels, is a primary driver of heart failure and life-threatening arrhythmias [2, 7]. Pharmacological agents targeting these proteins, such as calcium channel blockers like verapamil and amlodipine, are widely used to treat hypertension, angina, and supraventricular tachycardias [3, 10]. Modern therapeutic research also explores RyR2 stabilizers (Rycals) and SERCA2a activators to restore calcium handling in failing hearts [5, 9]. Additionally, these channels are critical targets in safety pharmacology to avoid drug-induced cardiotoxicity and arrhythmias [13].

Other names

Cardiomyocyte calcium channels/transportersCardiac calcium handling systemCalcium cycling proteinsMyocardial calcium transportersExcitation-contraction coupling proteinsCa2+ handling proteins

L-type calcium channel inhibition, ryanodine receptor stabilization, sarcoplasmic reticulum calcium ATPase activation, and sodium-calcium exchange modulation