Sodium channel protein epithelial 1 subunit beta (SCNN1B) (SCNN1B)

Sodium channel protein epithelial 1 subunit beta (SCNN1B) is a critical structural component of the heterotrimeric epithelial sodium channel (ENaC), which plays a central role in regulating sodium and water balance across various epithelial membranes [1, 2]. Primarily located in the distal nephron of the kidney, the respiratory airways, and the colon, this non-voltage-gated channel mediates the rate-limiting step of electrogenic sodium reabsorption from the lumen into epithelial cells [3, 5, 7]. Mutations in the SCNN1B gene are directly linked to several significant clinical conditions: gain-of-function mutations disrupt channel degradation and lead to Liddle syndrome, a form of severe early-onset hypertension, while loss-of-function mutations cause Pseudohypoaldosteronism type 1 (PHA1), a life-threatening salt-wasting disorder [3, 9, 11, 12]. The channel complex is the primary therapeutic target for potassium-sparing diuretics such as amiloride and triamterene, which block the channel's pore to reduce sodium reabsorption and lower blood pressure [1, 6, 7]. Beyond its classical role in electrolyte homeostasis, SCNN1B has been identified as a potential tumor suppressor in colorectal cancer and a key modifier gene in cystic fibrosis, where its dysregulation contributes to impaired airway surface liquid homeostasis and mucus clearance [4, 6, 10].

Other names

Amiloride-sensitive sodium channel subunit betaBeta-ENaCENaC-betaNonvoltage-gated sodium channel 1 subunit betaSCNEBEpithelial sodium channel subunit beta 1

Epithelial sodium channel (ENaC) inhibitor