title: 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.affiliation: Biomolecular Analysis Mass Spectrometry (BAMS) Facility, Grove Building, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK.
authors.forename: Alison
authors.initials: A
authors.lastname: Bond
authors.forename: Edward
authors.initials: E
authors.lastname: Dudley
authors.forename: Filip
authors.initials: F
authors.lastname: Lemière
authors.forename: Robin
authors.initials: R
authors.lastname: Tuytten
authors.forename: Salah
authors.initials: S
authors.lastname: El-Sharkawi
authors.forename: A Gareth
authors.initials: AG
authors.lastname: Brenton
authors.forename: Eddy L
authors.initials: EL
authors.lastname: Esmans
authors.forename: Russell P
authors.initials: RP
authors.lastname: Newton
mesh_terms: D014408:Biomarkers, Tumor / Q000652:urine*; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D009369:Neoplasms / Q000175:diagnosis* / Q000652:urine*; D011741:Pyrimidine Nucleosides / Q000652:urine*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D016482:Urinalysis / Q000379:methods*
chemical_list: D014408:Biomarkers, Tumor; D011741:Pyrimidine Nucleosides