Analysis of urinary nucleosides. V. Identification of urinary pyrimidine nucleosides by liquid chromatography/electrospray mass spectrometry.

Abstract

Modified urinary nucleosides are potentially invaluable in cancer diagnosis, as they reflect altered RNA turnovers. High-performance liquid chromatography (HPLC) was combined with full-scan mass spectrometry, tandem mass spectrometry, MS(n) analysis and accurate mass measurements in order to identify pyrimidine nucleosides purified from urine. Potential nucleosides were assessed by their evident UV absorbance in the HPLC chromatogram and then further examined by the various mass spectrometric techniques. In this manner numerous pyrimidine nucleosides were identified in the urine samples from cancer patients including pseudouridine, cytidine, two methylcytidines and an acetylcytidine. Furthermore, a number of novel modified pyrimidine nucleosides were tentatively identified via critical interpretation of the combined mass spectrometric data.

• Authors: Alison Bond, Edward Dudley, Filip Lemière, Robin Tuytten, Salah El-Sharkawi, A Gareth Brenton, Eddy L Esmans, Russell P Newton
• Journal: Rapid communications in mass spectrometry : RCM (Rapid Commun Mass Spectrom) Vol. 20 Issue 2 Pg. 137-50 ( 2006) ISSN: 0951-4198 [Print] England
• PMID: 16331740 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers, Tumor
• Pyrimidine Nucleosides

Topics

• Biomarkers, Tumor (urine)
• Chromatography, Liquid (methods)
• Humans
• Neoplasms (diagnosis, urine)
• Pyrimidine Nucleosides (urine)
• Reproducibility of Results
• Sensitivity and Specificity
• Spectrometry, Mass, Electrospray Ionization (methods)
• Urinalysis (methods)