Protein expression of urate transporters in renal tissue of patients with uric acid nephrolithiasis.
URAT1 and GLUT9 are two primary urate transporters involved in the renal urate handling. Renal urate underexcretion was reported in uric acid stone formers (UASF) in previous clinical studies. The aim of this study was to investigate the clinical features and possible impact of protein expression of URAT1 and GLUT9 in renal tissues of patients with uric acid (UA) nephrolithiasis. 23 UASF, 27 patients with calcium oxalate (CaOx) stones, and 22 normal controls were enrolled in this study. Clinical data revealed that older age of onset, high plasma UA concentration, low urinary PH, and relative renal urate underexcretion were associated with UASF. By immunohistochemical or western blotting analysis, a significant increase in the relative expression quantity of URAT1 in renal tissue of UASF was found compared to patients with CaOx nephrolithiasis and normal controls. In conclusion, our results suggested that upregulated URAT1 protein expression might contribute to the relative urate underexcretion from the kidney of UASF.
Center of Urology, Southwest Hospital, Third Military Medical University, 30, GaoTanYan, Chongqing, 400038, People's Republic of China.
Weihua
W
Fu
Qianwei
Q
Li
Jiwei
J
Yao
Ji
J
Zheng
Lang
L
Lang
Weibing
W
Li
Junan
J
Yan
D000328:Adult; D005786:Gene Expression Regulation; D051246:Glucose Transport Proteins, Facilitative / Q000378:metabolism*; D006801:Humans; D007668:Kidney / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D053040:Nephrolithiasis / Q000378:metabolism*; D027361:Organic Anion Transporters / Q000378:metabolism*; D027701:Organic Cation Transport Proteins / Q000378:metabolism*; D014527:Uric Acid / Q000378:metabolism*
D051246:Glucose Transport Proteins, Facilitative; D027361:Organic Anion Transporters; D027701:Organic Cation Transport Proteins; C491241:SLC22A12 protein, human; C411811:SLC2A9 protein, human; D014527:Uric Acid