title: Serum uromodulin concentrations correlate with glomerular filtration rate in patients with chronic kidney disease.
abstract: INTRODUCTION Urinary uromodulin excretion has been associated with kidney diseases. However, serum uromodulin concentrations have not been extensively studied in patients with chronic kidney disease (CKD), and the results of published studies are inconsistent. OBJECTIVES The aims of the study were to evaluate serum uromodulin concentrations in patients with CKD and to assess the utility of serum uromodulin measurements for diagnosing CKD stages. PATIENTS AND METHODS This observational study included 170 patients with CKD stages 1 to 5, not treated by renal replacement therapy, and 30 healthy individuals. The serum levels of creatinine, cystatin C, and uromodulin were measured, and estimated glomerular filtration rate (eGFR) was calculated according to the 2012 CKD Epidemiology Collaboration cystatin‑creatinine equation. RESULTS Among patients with CKD, serum uromodulin concentrations were significantly lower than in controls, and were strongly negatively correlated with renal retention markers (ie, serum creatinine and cystatin C) and strongly positively correlated with eGFR. An inverse, hyperbolic relationship between serum creatinine and uromodulin levels was analogous to the well‑known association between serum creatinine concentrations and eGFR. A receiver‑operating characteristic curve analysis showed a high diagnostic accuracy of the measurement of serum uromodulin concentrations in the assessment of CKD stages. CONCLUSIONS Serum uromodulin concentrations are closely correlated with eGFR, which is the recommended measure of renal function. As uromodulin is produced exclusively by renal tubular cells, the assessment of uromodulin levels in patients with CKD may be an alternative method for evaluating the number of functioning nephrons.
authors.forename: Danuta
authors.initials: D
authors.lastname: Fedak
authors.forename: Marek
authors.initials: M
authors.lastname: Kuźniewski
authors.forename: Andrzej
authors.initials: A
authors.lastname: Fugiel
authors.forename: Ewa
authors.initials: E
authors.lastname: Wieczorek-Surdacka
authors.forename: Bernadetta
authors.initials: B
authors.lastname: Przepiórkowska-Hoyer
authors.forename: Piotr
authors.initials: P
authors.lastname: Jasik
authors.forename: Przemysław
authors.initials: P
authors.lastname: Miarka
authors.forename: Paulina
authors.initials: P
authors.lastname: Dumnicka
authors.forename: Maria
authors.initials: M
authors.lastname: Kapusta
authors.forename: Bogdan
authors.initials: B
authors.lastname: Solnica
authors.forename: Władysław
authors.initials: W
authors.lastname: Sułowicz
mesh_terms: D000328:Adult; D000368:Aged; D003404:Creatinine / Q000097:blood; D055316:Cystatin C / Q000097:blood; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D051436:Renal Insufficiency, Chronic / Q000097:blood* / Q000175:diagnosis / Q000503:physiopathology; D012720:Severity of Illness Index; D058949:Uromodulin / Q000097:blood*
chemical_list: D055316:Cystatin C; D058949:Uromodulin; D003404:Creatinine