Solute carrier family 12 member 3 (SLC12A3) (NCC)

The Thiazide-sensitive sodium-chloride cotransporter (NCC), also known as Solute carrier family 12 member 3 (SLC12A3), is a transmembrane protein located in the distal convoluted tubule of the kidney [1]. It plays a pivotal role in renal electrolyte handling by mediating the electroneutral reabsorption of sodium and chloride ions from the primary urine [2]. This transport mechanism is essential for the fine-tuning of salt excretion and the long-term regulation of arterial blood pressure [3]. Genetic loss-of-function mutations in the SLC12A3 gene result in Gitelman syndrome, a condition characterized by low blood pressure, hypokalemia, and hypomagnesemia [4]. In contrast, increased activity or expression of NCC is linked to salt-sensitive hypertension and Gordon syndrome [1]. NCC is the specific molecular target for thiazide-type diuretics, such as hydrochlorothiazide and chlorthalidone, which are cornerstone therapies for managing hypertension [2]. These drugs bind to the chloride-binding site of the transporter, inhibiting ion reabsorption and promoting diuresis to lower blood volume [3]. Clinical use of these inhibitors requires monitoring for electrolyte imbalances like hypokalemia due to the downstream effects on potassium secretion [2]. Sources: [1] UniProt (P55017, SLC12A3_HUMAN) [2] StatPearls, "Thiazide Diuretics" [3] NIH/NCBI Gene (ID: 6559, SLC12A3) [4] PubMed, "Gitelman syndrome: consensus and guidance from a Kidney Disease: Improving Global Outcomes (KDIGO) Controversies Conference"

Other names

Thiazide-sensitive sodium-chloride cotransporterNa-Cl cotransporterTSCSLC12A3

Inhibition of the Na+/Cl- cotransporter in the distal convoluted tubule, preventing ion reabsorption and increasing urinary excretion of sodium and water.