Exploring the Role of the SLC12A Cation-Coupled Chloride Cotransporters in the Cardiovascular System.

Cardiomyopathies are a major category of cardiovascular disease, significantly contributing to global morbidity and mortality. Their pathogenesis involves a complex interplay of genetic and environmental factors, with multiple gene families playing critical roles in disease progression. Among these, the Solute Carrier 12A (SLC12A) family encodes membrane cation-coupled chloride cotransporters (CCCs), which are essential for ion transport and cellular homeostasis. By regulating intracellular chloride and potassium concentrations, SLC12A/CCC transporters may directly influence myocardial electrophysiology, repolarization dynamics, and susceptibility to cardiomyopathies. Dysfunction of potassium-handling cotransporters can disrupt action potential propagation, increasing the risk of arrhythmias, while chloride transport abnormalities exacerbate ischemic injury by impairing cell volume regulation and metabolic responses to hypoxia. This review examines the expression and protein levels of SLC12A/CCCs in cardiac tissue, providing crucial insights into their functional significance for maintaining cardiac ion homeostasis. Understanding the regulatory mechanisms of these transporters could inform therapeutic interventions to restore ion balance and mitigate myocardial dysfunction in affected patients, thereby improving cardiac health.