Metabolite profiling identifies markers of uremia.

J Am Soc Nephrol
Publication type
Journal Article
Authors
Keywords
Abstract

ESRD is a state of small-molecule disarray. We applied liquid chromatography/tandem mass spectrometry-based metabolite profiling to survey>350 small molecules in 44 fasting subjects with ESRD, before and after hemodialysis, and in 10 age-matched, at-risk fasting control subjects. At baseline, increased levels of polar analytes and decreased levels of lipid analytes characterized uremic plasma. In addition to confirming the elevation of numerous previously identified uremic toxins, we identified several additional markers of ESRD, including dicarboxylic acids (adipate, malonate, methylmalonate, and maleate), biogenic amines, nucleotide derivatives, phenols, and sphingomyelins. The pattern of lipids was notable for a universal decrease in lower-molecular-weight triacylglycerols, and an increase in several intermediate-molecular-weight triacylglycerols in ESRD compared with controls; standard measurement of total triglycerides obscured this heterogeneity. These observations suggest disturbed triglyceride catabolism and/or beta-oxidation in ESRD. As expected, the hemodialysis procedure was associated with significant decreases in most polar analytes. Unexpected increases in several metabolites, however, indicated activation of a broad catabolic program, including glycolysis, lipolysis, ketosis, and nucleotide breakdown. In summary, this study demonstrates the application of metabolite profiling to identify markers of ESRD, provide perspective on uremic dyslipidemia, and broaden our understanding of the biochemical effects of hemodialysis.

Year of Publication
2010
Journal
J Am Soc Nephrol
Volume
21
Issue
6
Pages
1041-1051
Date Published
2010 Jun
ISSN
1533-3450
URL
DOI
10.1681/ASN.2009111132
PubMed ID
20378825
PubMed Central ID
PMC2900954
Links
Grant list
K23 HL091106 / HL / NHLBI NIH HHS / United States
UL1 RR025758 / RR / NCRR NIH HHS / United States
T32 DK00754023 / DK / NIDDK NIH HHS / United States
UL1 RR025758-01 / RR / NCRR NIH HHS / United States