Abstract
Introduction
Urinary pteridines are putative molecular biomarkers for noninvasive cancer screening and prognostication. Central to their translational biomarker development is the need to understand the sources and extent of their non-epidemiological variation.
Objectives
This study was designed to characterize the two primary sources of urinary pteridine variance: daily variation and the effect of dietary folate.
Methods
Daily variation was studied by collecting urine specimens (n = 81) three times daily for 3 days. The effect of dietary folate was investigated in a treatment study in which urine specimens (n = 168) were collected daily during a control week and a treatment week during which participants received dietary folate supplements. Measurements of six urinary pteridines were made using high-performance liquid chromatography–tandem mass spectrometry. Coefficients of variation were calculated to characterize daily variance between and within subjects, while nearest neighbor non-parametric analyses were used to identify diurnal patterns and measure dietary folate effects.
Results
Daily variance was approximately 35 % RSD for both within-day and between-day periods for most pteridines. Diurnal patterns in response to circadian rhythms were similarly observed for urinary pteridines. Folate supplementation was shown to alter urinary pteridine profiles in a pathway dependent manner, suggesting that dietary folate may regulate endogenous neopterin and biopterin biosynthesis.
Conclusions
Urinary pteridine levels were found to be responsive to both daily variation and folate supplementation. These findings provide new insights into pteridine biosynthesis and regulation as well as useful information for the design of future clinical translational research.
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Acknowledgments
Special thanks are given to Sunghee Choi and Henry Meyer for their assistance toward the urine specimen collection, to Dr. V. A. Samaranayake for statistical consultation, and to the 30 study participants who enthusiastically supported this work. The authors also thank AB Sciex, Millipore, and the Center for Single Cell, Single Nanoparticle, and Single Molecule Monitoring at Missouri University of Science and Technology for their valuable support.
Funding
C. Burton received financial support through a National Science Foundation Graduate Research Fellowship (#DGE-1011744).
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C. Burton, H. Shi, and Y. Ma declare that they have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Burton, C., Shi, H. & Ma, Y. Daily variation and effect of dietary folate on urinary pteridines. Metabolomics 12, 78 (2016). https://doi.org/10.1007/s11306-016-1019-4
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DOI: https://doi.org/10.1007/s11306-016-1019-4