title: Separation and identification of purine nucleosides in the urine of patients with malignant cancer by reverse phase liquid chromatography/electrospray tandem mass spectrometry.
abstract: Urinary-modified nucleosides have a potential role as cancer biomarkers for a number of malignant diseases. High performance liquid chromatography (HPLC) was combined with full-scan mass spectrometry, MS/MS analysis and accurate mass measurements in order to identify purine nucleosides purified from urine. Potential purine nucleosides were assessed by their evident UV absorbance in the HPLC chromatogram and then further examined by the mass spectrometric techniques. In this manner, numerous modified purine nucleosides were identified in the urine samples from cancer patients including xanthine, adenosine, N1-methyladenosine, 5'-deoxy-5'-methylthioadenosine, 2-methyladenosine, N6-threonylcarbamoyladenosine, inosine, N1-methylinosine, guanosine, N1-methylguanosine, N7-methylguanine, N2-methylguanosine, N2,N2-dimethyguanosine, N2,N2,N7-trimethylguanosine. Furthermore, a number of novel purine nucleosides were tentatively identified via critical interpretation of the combined mass spectrometric data including N3-methyladenosine, N7-methyladenine, 5'-dehydro-2'-deoxyinosine, N3-methylguanine, O6-methylguanosine, N1,N2,N7-trimethylguanosine, N1-methyl-N2-ethylguanosine and N7-methyl-N1-ethylguanosine.
authors.affiliation: Department of Chemistry, Zhengzhou University, 100 Science Road, 450001 Zhengzhou, China.
authors.forename: Hua-Yu
authors.initials: HY
authors.lastname: Li
authors.forename: Shao-Min
authors.initials: SM
authors.lastname: Wang
authors.forename: Hong-Min
authors.initials: HM
authors.lastname: Liu
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Bu
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.forename: Dong
authors.initials: D
authors.lastname: Han
authors.forename: Ming-zhi
authors.initials: MZ
authors.lastname: Zhang
authors.forename: Guang-Yin
authors.initials: GY
authors.lastname: Wu
mesh_terms: D014408:Biomarkers, Tumor / Q000652:urine; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008223:Lymphoma / Q000652:urine*; D011684:Purine Nucleosides / Q000652:urine*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D014408:Biomarkers, Tumor; D011684:Purine Nucleosides