Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-42006
J Biol Chem 2010 Nov 05;28545:35123-32. doi: 10.1074/jbc.M110.121301.
Show Gene links Show Anatomy links

Human sodium phosphate transporter 4 (hNPT4/SLC17A3) as a common renal secretory pathway for drugs and urate.

Jutabha P , Anzai N , Kitamura K , Taniguchi A , Kaneko S , Yan K , Yamada H , Shimada H , Kimura T , Katada T , Fukutomi T , Tomita K , Urano W , Yamanaka H , Seki G , Fujita T , Moriyama Y , Yamada A , Uchida S , Wempe MF , Endou H , Sakurai H .


???displayArticle.abstract???
The evolutionary loss of hepatic urate oxidase (uricase) has resulted in humans with elevated serum uric acid (urate). Uricase loss may have been beneficial to early primate survival. However, an elevated serum urate has predisposed man to hyperuricemia, a metabolic disturbance leading to gout, hypertension, and various cardiovascular diseases. Human serum urate levels are largely determined by urate reabsorption and secretion in the kidney. Renal urate reabsorption is controlled via two proximal tubular urate transporters: apical URAT1 (SLC22A12) and basolateral URATv1/GLUT9 (SLC2A9). In contrast, the molecular mechanism(s) for renal urate secretion remain unknown. In this report, we demonstrate that an orphan transporter hNPT4 (human sodium phosphate transporter 4; SLC17A3) was a multispecific organic anion efflux transporter expressed in the kidneys and liver. hNPT4 was localized at the apical side of renal tubules and functioned as a voltage-driven urate transporter. Furthermore, loop diuretics, such as furosemide and bumetanide, substantially interacted with hNPT4. Thus, this protein is likely to act as a common secretion route for both drugs and may play an important role in diuretics-induced hyperuricemia. The in vivo role of hNPT4 was suggested by two hyperuricemia patients with missense mutations in SLC17A3. These mutated versions of hNPT4 exhibited reduced urate efflux when they were expressed in Xenopus oocytes. Our findings will complete a model of urate secretion in the renal tubular cell, where intracellular urate taken up via OAT1 and/or OAT3 from the blood exits from the cell into the lumen via hNPT4.

???displayArticle.pubmedLink??? 20810651
???displayArticle.pmcLink??? PMC2966126
???displayArticle.link??? J Biol Chem


Species referenced: Xenopus laevis
Genes referenced: kcnk3 slc22a6 slc2a9

???displayArticle.disOnts??? hyperuricemia
References [+] :
Anzai, Organic anion transporter family: current knowledge. 2006, Pubmed