Urea transporter 2 (UT-A2) (UT-A2)

Urea transporter 2 (UT-A2) is a transmembrane protein encoded by the SLC14A2 gene, primarily expressed in the thin descending limb of the loop of Henle within the kidney [1][2]. It facilitates the passive transport of urea, which is a critical component of the intrarenal urea recycling process [2]. This recycling is essential for establishing and maintaining the high osmotic gradient in the inner medulla, which allows for efficient water reabsorption and the production of concentrated urine [3]. From a therapeutic perspective, UT-A2 is considered a promising target for "urearetic" diuretics [4]. Unlike traditional diuretics that target sodium transporters and often cause electrolyte imbalances, UT-A2 inhibitors promote water excretion by disrupting the medullary osmotic gradient [4][5]. Research into small-molecule inhibitors of UT-A2 is currently focused on treating fluid overload states associated with congestive heart failure, cirrhosis, and nephrotic syndrome [5]. These inhibitors aim to provide a more balanced diuretic effect with fewer side effects related to potassium or sodium loss [4]. Sources: [1] UniProt (Q15848); [2] Sands, J. M. (2003) Annu. Rev. Physiol.; [3] Klein, J. D., & Sands, J. M. (2011) Urea Transporters; [4] Esteva-Font, C., et al. (2014) Curr. Med. Chem.; [5] Verkman, A. S., et al. (2014) Nat. Rev. Nephrol.

Other names

SLC14A2Urea transporter ASolute carrier family 14 member 2HUT11UT-A

Inhibition of urea transport in the thin descending limb of Henle's loop, which disrupts the medullary osmotic gradient and reduces the kidney's ability to concentrate urine, resulting in increased water and urea excretion.