Cardiac ion channels and membrane-associated proteins

Cardiac ion channels and membrane-associated proteins are a diverse set of proteins embedded in the sarcolemma of cardiomyocytes that regulate the flow of ions such as sodium, potassium, and calcium (StatPearls, 2023). This group includes voltage-gated channels (e.g., SCN5A, KCNH2, CACNA1C), ion pumps (e.g., Na+/K+-ATPase), and exchangers (e.g., NCX1) that collectively generate the cardiac action potential and maintain ionic gradients (PubMed, 2021). These proteins are essential for the rhythmic excitation and contraction of the heart, and their dysfunction is a primary cause of cardiac arrhythmias and sudden cardiac death (NIH, 2022). Pharmacological agents, including various classes of antiarrhythmics and cardiac glycosides, target these proteins to treat conditions like atrial fibrillation and heart failure (PubChem, 2024). However, because these proteins are fundamental to cardiac stability, drugs that interact with them often carry a high risk of proarrhythmia and require precise dosing and monitoring (Wikipedia, 2023).

Other names

Cardiac electrophysiology proteinsMyocardial ion channelsCardiac ion transportersCardiac membrane proteins

Drugs targeting these proteins modulate the movement of ions across the sarcolemma to alter the cardiac action potential, conduction velocity, and intracellular calcium levels, thereby managing heart rhythm and contractility (StatPearls, 2023).