Journal of Shanghai Jiao Tong University (Medical Science) >

2024 , Vol. 44 >Issue 5: 591 - 598

DOI: https://doi.org/10.3969/j.issn.1674-8115.2024.05.007

Clinical research

Association between urinary excretion of protein-bound uremic toxins and upper urinary tract calculus

  • Wenji WANG ,
  • Kaiyi ZHONG ,
  • Jiaolun LI ,
  • Yueling ZHOU ,
  • Tao HUANG ,
  • Lizhu DUAN ,
  • Yuqi SHEN ,
  • Xuezhu LI ,
  • Feng DING ,
  • Danshu XIE
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  • 1.Department of Nephrology, Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
    2.Department of Nephrology, Hainan West Central Hospital, Danzhou 571700, China
XIE Danshu, E-mail: melody_hp@163.com.

Received date: 2023-10-16

  Accepted date: 2024-02-23

  Online published: 2024-05-28

Supported by

Project of Shanghai Municipal Health Commission(202040435);Clinical Research Program of Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine(JYLJ202218);Project of Biobank from Shanghai Ninth People′s Hospital, Shanghai Jiao Tong University School of Medicine(YBKB202115)

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Abstract

Objective ·To investigate the relation between urinary excretion of protein-bound uremic toxins (PBUTs) and upper urinary tract calculus. Methods ·Residents aged 18?80 years in the community of Haitou, Danzhou city in Hainan Province were recruited. Basic information and diet for the last 3 d of the subjects were recorded. Their fasting sera and 24-hour urine samples were collected, and they also underwent ultrasound examination of kidneys and ureters. The subjects with upper urinary calculi detected by ultrasound or a clear history of upper urinary calculi were selected as the calculus group, and the others as the non-calculus group. The biochemical indicators related to the formation of calculus in blood and urine were detected, and the levels of PBUTs, including indoxyl sufate (IS), indole-3-acetic acid (IAA), and p-cresol sulfate (PCS) in blood and urine, as well as oxalic acid and citric acid in urine were detected by high-performance liquid chromatography. The related factors of upper urinary tract calculus formation were analyzed by multivariate Logistic regression. The correlations of urine PBUTs with urine uric acid, oxalic acid, and citric acid were analyzed by Spearman correlation test. Results ·A total of 117 participants were screened out with 54 people in the calculus group and 63 people in the non-calculus group. There were no significant differences between the two groups in terms of gender, age, serum indicators, and prevalence of complications such as hypertension, diabetes, and hyperuricemia/gout. The 24-hour urine pH, calcium, uric acid, and chlorine in the calculus group were significantly higher than those in the non-calculus group (all P<0.05), while IS was significantly lower than that in the non-calculus group (P<0.05). Multivariate Logistic regression analysis showed that urinary IS (OR=0.929, 95%CI 0.875?0.986, P=0.016) was related to the calculus formation independently, in addition to urinary calcium. The Spearman correlation analysis results showed that the levels of IAA (r=0.420, P=0.000) and PCS (r=0.307, P=0.001) in 24-hour urine were positively correlated with oxalic acid, PCS was positively correlated with uric acid (r=0.297, P=0.002), and IS was positively correlated with citric acid (r=0.289, P=0.002). Conclusion ·In the population, a decrease in urinary excretion of IS may be an independent risk factor for the formation of upper urinary tract calculus, and PBUTs levels are correlated with levels of uric acid, oxalic acid, and citric acid.

Key words： protein-bound uremic toxin (PBUT); upper urinary tract calculus; renal tubular secretion; indoxyl sufate (IS); indole-3-acetic acid (IAA); p-cresol sulfate (PCS)

Cite this article

Wenji WANG , Kaiyi ZHONG , Jiaolun LI , Yueling ZHOU , Tao HUANG , Lizhu DUAN , Yuqi SHEN , Xuezhu LI , Feng DING , Danshu XIE . Association between urinary excretion of protein-bound uremic toxins and upper urinary tract calculus[J]. Journal of Shanghai Jiao Tong University (Medical Science), 2024 , 44(5) : 591 -598 . DOI: 10.3969/j.issn.1674-8115.2024.05.007

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