Iwakawa H, Makabe S, Ito T, Yoshimura T, Watanabe H. Urinary D-serine level as a predictive biomarker for deterioration of renal function in patients with atherosclerotic risk factors.
Biomarkers 2018;
24:159-165. [PMID:
30252501 DOI:
10.1080/1354750x.2018.1528632]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
BACKGROUND
D-serine, the enantiomer of L-serine, was identified in mammals 20 years ago. Although a close relationship between D-serine and renal dysfunction has been shown, the clinical implications of urinary D- and L-serine in humans are poorly understood. The aim of this study was to evaluate the relationship between urinary D- and L-serine with well-known renal biomarkers, and clarify the prognostic value of D- and L-serine for renal events.
METHODS
This cross-sectional, prospective study included 65 patients with atherosclerotic risk factors, who were followed up for a median of 16 months. The primary endpoint was a composite of end-stage renal disease and a decline in estimated glomerular filtration rate (eGFR) ≥ 25% from baseline.
RESULTS
Urinary D-serine concentrations showed a better correlation with eGFR than did urinary L-serine, whereas neither urinary D- nor L-serine correlated with tubular markers such as urinary liver-type fatty acid-binding protein and N-acetyl-beta-D-glucosaminidase. A Cox regression analysis revealed that low urinary D-serine levels were significantly associated with the primary endpoint after adjusting for confounding factors (hazard ratio 12.60; 95% confidence interval, 3.49-45.51).
CONCLUSIONS
Urinary D-serine is associated with glomerular filtration and can be a prognostic biomarker of renal dysfunction in patients with atherosclerotic risk factors.
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