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Protein Expression of Urate Transporters in Renal Tissue of Patients with Uric Acid Nephrolithiasis

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Abstract

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.

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Acknowledgments

We thank Urology of Emergency Medical Center of Chongqing, China for providing renal samples. This study was supported by the Natural Science Foundation of Chongqing Science and Technology Commission (Chongqing, China; Grant No. 2011BA5011).

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Authors and Affiliations

  1. Center of Urology, Southwest Hospital, Third Military Medical University, 30, GaoTanYan, Chongqing, 400038, People’s Republic of China

    Weihua Fu, Qianwei Li, Jiwei Yao, Ji Zheng, Lang Lang, Weibing Li & Junan Yan

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  1. Weihua Fu
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  2. Qianwei Li
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  3. Jiwei Yao
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  4. Ji Zheng
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Correspondence to Weibing Li or Junan Yan.

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Fu, W., Li, Q., Yao, J. et al. Protein Expression of Urate Transporters in Renal Tissue of Patients with Uric Acid Nephrolithiasis. Cell Biochem Biophys 70, 449–454 (2014). https://doi.org/10.1007/s12013-014-9939-y

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