Thiazide-sensitive sodium-chloride cotransporter (NCC) (NCC)

The Thiazide-sensitive sodium-chloride cotransporter (NCC), also known as Solute carrier family 12 member 3 (SLC12A3), is a symporter protein located in the apical membrane of the distal convoluted tubule of the kidney (UniProt: P55017). It plays a pivotal role in renal electrolyte handling by mediating the electroneutral reabsorption of sodium and chloride from the primary urine, which is essential for maintaining extracellular fluid volume and systemic blood pressure (PubMed: 25135286). Dysregulation of NCC activity is a major factor in the pathogenesis of hypertension, while loss-of-function mutations in the SLC12A3 gene cause Gitelman syndrome, a salt-wasting disorder (NCBI Gene: 6559). NCC is the molecular target for thiazide and thiazide-like diuretics, which are among the most commonly prescribed antihypertensive medications worldwide (StatPearls: NBK532918). These drugs bind to the chloride-binding site of the transporter, inhibiting ion reabsorption and promoting diuresis. Monitoring of NCC activity through urinary exosomes has emerged as a potential biomarker for salt-sensitive hypertension and treatment response (PubMed: 21454717).

Other names

SLC12A3Solute carrier family 12 member 3TSCNa-Cl cotransporter

Inhibition of the sodium-chloride symporter in the distal convoluted tubule, leading to increased renal excretion of sodium, chloride, and water.