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Li H, He H, Liu Z. Recent progress and application of boronate affinity materials in bioanalysis. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116271] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Banys K, Giebultowicz J, Sobczak M, Wyrebiak R, Bielecki W, Wrzesien R, Bobrowska-Korczak B. Effect of Genistein Supplementation on the Progression of Neoplasms and the Level of the Modified Nucleosides in Rats With Mammary Cancer. In Vivo 2021; 35:2059-2072. [PMID: 34182481 DOI: 10.21873/invivo.12475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 01/17/2023]
Abstract
BACKGROUND/AIM The aim of the study was to assess the impact of nano-, micro-, and macro-sized-genistein on the growth and development of neoplasms in rats with mammary cancer. Additionally, the effect on the kinetics of changes (9-11-17-20 week of a rat's life) in the levels of methyl derivatives: 1-methyladenine, 3-methyladenine, 7-methylguanine, 1-methylguanine, 1-methyladenosine, 7-methylguanosine, O-methyl-guanosine and N6-methyl-2'-deoxyguanosine in the urine of rats was analyzed. MATERIALS AND METHODS Female Sprague-Dawley rats divided into 4 groups were used in the study. Animals were fed only a control diet or diets supplemented with the nano-, micro- and macro-sized genistein. To induce the mammary adenocarcinoma, rats were treated with 7,12-dimethylbenz[a]anthracene (DMBA). Modified nucleosides were determined by a high-performance liquid chromatography coupled to mass spectrometry method (LC-MS/MS). RESULTS The supplementation of the diet of animals with genistein resulted in an increase in the excretion of methylated derivatives in the urine of rats. In the animals receiving standard diet, the levels of methyl derivatives increased during the study or remained relatively low. In the case of animals whose diet was supplemented with the various forms of genistein, the levels of methylated derivatives were very high from the beginning. CONCLUSION High levels of methyl derivatives can influence carcinogenesis.
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Affiliation(s)
- Karolina Banys
- Department of Bromatology, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
| | - Joanna Giebultowicz
- Department of Drug Analysis, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
| | - Marcin Sobczak
- Department of Biomaterials Chemistry, Chair of Analytical Chemistry and Biomaterials, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
| | - Rafal Wyrebiak
- Department of Biomaterials Chemistry, Chair of Analytical Chemistry and Biomaterials, Faculty of Pharmacy, Medical University of Warsaw, Warsaw, Poland
| | - Wojciech Bielecki
- Department of Pathology and Veterinary Diagnostics, Faculty of Veterinary Medicine, Warsaw University of Live Sciences, Warsaw, Poland
| | - Robert Wrzesien
- Central Laboratory of Experimental Animals, Medical University of Warsaw, Warsaw, Poland
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Stockert JA, Weil R, Yadav KK, Kyprianou N, Tewari AK. Pseudouridine as a novel biomarker in prostate cancer. Urol Oncol 2021; 39:63-71. [PMID: 32712138 PMCID: PMC7880613 DOI: 10.1016/j.urolonc.2020.06.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/16/2020] [Accepted: 06/21/2020] [Indexed: 01/25/2023]
Abstract
Epitranscriptomic analysis has recently led to the profiling of modified nucleosides in cancer cell biological matrices, helping to elucidate their functional roles in cancer and reigniting interest in exploring their use as potential markers of cancer development and progression. Pseudouridine, one of the most well-known and the most abundant of the RNA nucleotide modifications, is the C5-glycoside isomer of uridine and its distinctive physiochemical properties allows it to perform many essential functions. Pseudouridine functionally (a) confers rigidity to local RNA structure by enhancing RNA stacking, engaging in a cooperative effect on neighboring nucleosides that overall contributes to RNA stabilization (b) refines the structure of tRNAs, which influences their decoding activity (c) facilitates the accuracy of decoding and proofreading during translation and efficiency of peptide bond formation, thus collectively improving the fidelity of protein biosynthesis and (e) dynamically regulates mRNA coding and translation. Biochemical synthesis of pseudouridine is carried out by pseudouridine synthases. In this review we discuss the evidence supporting an association between elevated pseudouridine levels with the incidence and progression of human prostate cancer and the translational significance of the value of this modified nucleotide as a novel biomarker in prostate cancer progression to advanced disease.
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Affiliation(s)
- Jennifer A Stockert
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029
| | - Rachel Weil
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029
| | - Kamlesh K Yadav
- Department of Engineering Medicine, Texas A&M Health Science Center College of Medicine, Houston, TX 77030
| | - Natasha Kyprianou
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029; Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, NY 10029.
| | - Ashutosh K Tewari
- Department of Urology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029
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Kiebish MA, Cullen J, Mishra P, Ali A, Milliman E, Rodrigues LO, Chen EY, Tolstikov V, Zhang L, Panagopoulos K, Shah P, Chen Y, Petrovics G, Rosner IL, Sesterhenn IA, McLeod DG, Granger E, Sarangarajan R, Akmaev V, Srinivasan A, Srivastava S, Narain NR, Dobi A. Multi-omic serum biomarkers for prognosis of disease progression in prostate cancer. J Transl Med 2020; 18:10. [PMID: 31910880 PMCID: PMC6945688 DOI: 10.1186/s12967-019-02185-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 12/23/2019] [Indexed: 01/31/2023] Open
Abstract
Background Predicting the clinical course of prostate cancer is challenging due to the wide biological spectrum of the disease. The objective of our study was to identify prostate cancer prognostic markers in patients ‘sera using a multi-omics discovery platform. Methods Pre-surgical serum samples collected from a longitudinal, racially diverse, prostate cancer patient cohort (N = 382) were examined. Linear Regression and Bayesian computational approaches integrated with multi-omics, were used to select markers to predict biochemical recurrence (BCR). BCR-free survival was modeled using unadjusted Kaplan–Meier estimation curves and multivariable Cox proportional hazards analysis, adjusted for key pathologic variables. Receiver operating characteristic (ROC) curve statistics were used to examine the predictive value of markers in discriminating BCR events from non-events. The findings were further validated by creating a training set (N = 267) and testing set (N = 115) from the cohort. Results Among 382 patients, 72 (19%) experienced a BCR event in a median follow-up time of 6.9 years. Two proteins—Tenascin C (TNC) and Apolipoprotein A1V (Apo-AIV), one metabolite—1-Methyladenosine (1-MA) and one phospholipid molecular species phosphatidic acid (PA) 18:0-22:0 showed a cumulative predictive performance of AUC = 0.78 [OR (95% CI) = 6.56 (2.98–14.40), P < 0.05], in differentiating patients with and without BCR event. In the validation set all four metabolites consistently reproduced an equivalent performance with high negative predictive value (NPV; > 80%) for BCR. The combination of pTstage and Gleason score with the analytes, further increased the sensitivity [AUC = 0.89, 95% (CI) = 4.45–32.05, P < 0.05], with an increased NPV (0.96) and OR (12.4) for BCR. The panel of markers combined with the pathological parameters demonstrated a more accurate prediction of BCR than the pathological parameters alone in prostate cancer. Conclusions In this study, a panel of serum analytes were identified that complemented pathologic patient features in predicting prostate cancer progression. This panel offers a new opportunity to complement current prognostic markers and to monitor the potential impact of primary treatment versus surveillance on patient oncological outcome.
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Affiliation(s)
| | - Jennifer Cullen
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.,Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Prachi Mishra
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.,Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Amina Ali
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | | | | | | | | | | | | | | | - Yongmei Chen
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.,Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Gyorgy Petrovics
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA.,Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Inger L Rosner
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | | | - David G McLeod
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | | | | | | | - Alagarsamy Srinivasan
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
| | - Shiv Srivastava
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA
| | | | - Albert Dobi
- Henry Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA. .,Center for Prostate Disease Research, Department of Surgery, Uniformed Services University and the Walter Reed National Military Medical Center, Bethesda, MD, USA.
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Li H, Zhang X, Zhang L, Wang X, Kong F, Fan D, Li L, Wang W. Preparation of a silica stationary phase co-functionalized with Wulff-type phenylboronate and C12 for mixed-mode liquid chromatography. Anal Chim Acta 2017; 962:104-113. [PMID: 28231874 DOI: 10.1016/j.aca.2017.01.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 01/14/2017] [Accepted: 01/18/2017] [Indexed: 10/20/2022]
Abstract
A silica stationary phase was designed and synthesized through the co-functionalization of silica with Wulff-type phenylboronate and C12 for mixed-mode liquid chromatography applications. The as-synthesized stationary phase was characterized by elemental analysis and Fourier Transform-InfraRed Spectroscopy (FT-IR). Retention mechanisms, including boronate affinity (BA), reversed-phase (RP) and anion-exchange (AE), were involved. Retention mechanism switching was easily realized by adjustment of the mobile phase constitution. Cis-diol compounds could be selectively captured under neutral conditions in BA mode and off-line separated in RP mode. Neutral, basic, acidic and amphiprotic compounds were chromatographed on the column in RP chromatography, while inorganic anions were chromatographed in AE chromatography to characterize the mixed-mode nature of the prepared stationary phase. In addition, the RP performance was compared with an octadecyl silica column in terms of column efficiency (N/m), asymmetry factor (Af), retention factor (k) and resolution (Rs). The prepared stationary phase offered multiple interactions with analytes in addition to hydrophobic interactions under RP elution conditions. Based on the mixed-mode properties, off-line 2D-LC, for selective capture and separation of urinary nucleosides, was successfully realized on a single column, demonstrating its powerful application potential for complex samples.
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Affiliation(s)
- Hengye Li
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China
| | - Xuemeng Zhang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China
| | - Lin Zhang
- Yancheng Entry-Exit Inspection and Quarantine Bureau, Yancheng, 224000, China
| | - Xiaojin Wang
- Huai'an Entry-Exit Inspection and Quarantine Bureau, Huai'an, 223001, China
| | - Fenying Kong
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China
| | - Dahe Fan
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China
| | - Lei Li
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China
| | - Wei Wang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu, 224000, China.
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Jinno D, Kanemitsu Y, Saitoh K, Nankumo S, Tsukamoto H, Matsumoto Y, Abe T, Tomioka Y. Rapid and selective simultaneous quantitative analysis of modified nucleosides using multi-column liquid chromatography-tandem mass spectrometry. J Anal Sci Technol 2017. [DOI: 10.1186/s40543-017-0110-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Zhu Y, Wang P, Sha W, Sang S. Urinary Biomarkers of Whole Grain Wheat Intake Identified by Non-targeted and Targeted Metabolomics Approaches. Sci Rep 2016; 6:36278. [PMID: 27805021 PMCID: PMC5090248 DOI: 10.1038/srep36278] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 10/13/2016] [Indexed: 01/08/2023] Open
Abstract
Mounting evidence suggests that whole grain (WG) intake plays an important role in chronic disease prevention. However, numerous human studies have failed to produce clear-cut conclusions on this topic. Here, a combination of non-targeted and targeted metabolomics approaches, together with kinetic studies, was used to investigate biomarkers of WG wheat intake and further explore the diet-disease associations. Via these integrated approaches, forty-one compounds were identified as the most discriminating endogenous metabolites after WG versus refined grain (RG) wheat bread consumption. The corresponding biological assessment of these endogenous changes suggests that, in contrast to RG consumption, WG wheat consumption may facilitate antioxidant defense systems and moderate the risk factors of cancer, cardiovascular diseases, and other chronic diseases. A panel of urinary markers consisting of seven alkylresorcinol metabolites and five benzoxazinoid derivatives as specific biomarkers, as well as five phenolic acid derivatives, was also established to cover multiple time points and longer time periods for correctly and objectively monitoring WG wheat intake. Through these findings, we have established a comprehensive biomarker pool to better assess WG wheat consumption, and to monitor the endogenous changes that are linked to health effects of WG wheat consumption.
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Affiliation(s)
- Yingdong Zhu
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, Kannapolis, NC, USA
| | - Pei Wang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, Kannapolis, NC, USA
| | - Wei Sha
- Bioinformatics Services Division, University of North Carolina at Charlotte, North Carolina Research Campus, Kannapolis, NC, USA
| | - Shengmin Sang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, Kannapolis, NC, USA
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Li H, Zhang X, Zhang L, Wang X, Kong F, Fan D, Li L, Wang W. Preparation of a boronate affinity silica stationary phase with enhanced binding properties towards cis -diol compounds. J Chromatogr A 2016; 1473:90-98. [DOI: 10.1016/j.chroma.2016.10.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 09/29/2016] [Accepted: 10/19/2016] [Indexed: 01/11/2023]
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Seidel A, Seidel P, Manuwald O, Herbarth O. Modified nucleosides as biomarkers for early cancer diagnose in exposed populations. ENVIRONMENTAL TOXICOLOGY 2015; 30:956-967. [PMID: 24615900 DOI: 10.1002/tox.21970] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 02/04/2014] [Accepted: 02/09/2014] [Indexed: 06/03/2023]
Abstract
There is increasing worldwide interest in developing of markers for tumor diagnosis and identification of individuals who are at high cancer risk. Cancer, like other diseases accompanied by metabolic disorders, causes characteristic effects on cell turnover rate, activity of modifying enzymes, and RNA/DNA modifications. This results in an increased excretion of modified nucleosides in cancer patients. Therefore, for many years modified nucleosides have been suggested as tumor markers. The aim of the study was to elucidate further the usefulness of urinary nucleosides as possible markers at early detection of cancer in persons which are exposed against tumor promoting influences during their working life. Uranium miners are exposed to many kinds of pollutants that can cause health damage even lead to carcinogenesis. We analyzed modified nucleosides in urine samples from 92 miners who are at high risk for lung cancer to assess the levels of nucleosides by a multilayer perceptron (MLP) classifier - a neural network model. Eighteen nucleosides/metabolites were detected with reversed-phase high-pressure liquid chromatography (RP-HPLC). A valid set of urinary metabolites were selected and multivariate statistical technique of multilayer perceptron neural network were applied. In a previous study, MLP shows a sensitivity and specificity of 97 and 85%, respectively. MLP classification including the most relevant markers/nucleosides clearly demonstrates the elevation of RNA metabolism in miners, which is associated with possible malignant disease. We found that there were 30 subjects with early health disorders among 92 uranium workers based on MLP technique using modified nucleosides. The combination of RP-HPLC analysis of modified nucleosides and subsequent MLP analyses represents a promising tool for the development of a non-invasive prediction system and may assist in developing management and surveillance procedures.
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Affiliation(s)
- Annerose Seidel
- Environmental Medicine and Hygiene, Faculty of Medicine, University of Leipzig, Liebigstrasse 27, 04103, Leipzig, Germany
| | - Peter Seidel
- Institute of Medical Biophysics and Physics, Faculty of Medicine, University of Leipzig, Liebigstrasse 27, 04103, Leipzig, Germany
| | - Olaf Manuwald
- Institute of Environmental Medicine, Heinrich-Heine-Strasse 3, 99096, Erfurt, Germany
| | - Olf Herbarth
- Environmental Medicine and Hygiene, Faculty of Medicine, University of Leipzig, Liebigstrasse 27, 04103, Leipzig, Germany
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Struck-Lewicka W, Kaliszan R, Markuszewski MJ. Analysis of urinary nucleosides as potential cancer markers determined using LC–MS technique. J Pharm Biomed Anal 2014; 101:50-7. [DOI: 10.1016/j.jpba.2014.04.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 04/18/2014] [Accepted: 04/22/2014] [Indexed: 01/05/2023]
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Mikulska A, Inoue M, Kuroda K, Iwanowska A, Yusa SI, Nowakowska M, Szczubiałka K. Polymeric/silicagel hybrid molecularly photoimprinted adsorbents for adenosine and its derivatives. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.07.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Li H, Shan Y, Qiao L, Dou A, Shi X, Xu G. Facile Synthesis of Boronate-Decorated Polyethyleneimine-Grafted Hybrid Magnetic Nanoparticles for the Highly Selective Enrichment of Modified Nucleosides and Ribosylated Metabolites. Anal Chem 2013; 85:11585-92. [DOI: 10.1021/ac402979w] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Hua Li
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yuanhong Shan
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Lizhen Qiao
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Abo Dou
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xianzhe Shi
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Guowang Xu
- CAS Key Lab of Separation Sciences for
Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Li F, Yang FQ, Xia ZN. Simultaneous Determination of Ten Nucleosides and Related Compounds by MEEKC with [BMIM]PF6 as Oil Phase. Chromatographia 2013. [DOI: 10.1007/s10337-013-2507-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Supramolecular Polymeric Chemosensor for Biomedical Applications: Design and Synthesis of a Luminescent Zinc Metallopolymer as a Chemosensor for Adenine Detection. J Fluoresc 2012; 22:1539-46. [DOI: 10.1007/s10895-012-1092-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 06/20/2012] [Indexed: 01/23/2023]
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Teichert F, Winkler S, Keun HC, Steward WP, Gescher AJ, Farmer PB, Singh R. Evaluation of urinary ribonucleoside profiling for clinical biomarker discovery using constant neutral loss scanning liquid chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:2071-2082. [PMID: 21698690 DOI: 10.1002/rcm.5086] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The patterns and levels of urinary excreted ribonucleosides which reflect RNA turnover and metabolism in humans offer the potential for early detection of disease and monitoring of therapeutic intervention. A liquid chromatography/tandem mass spectrometry (LC/MS/MS) method employing constant neutral loss (CNL) scanning for the loss of the ribose moiety (132 u) was used to detect ribonucleosides in human urine and to evaluate this analytical platform for biomarker research in clinical trials. Ribonucleosides were stable and not influenced by the time spent at room temperature prior to freezing or long-term storage at -80 °C. Matrix effects caused variation in the mass spectrometer response which was dependent on the concentration of the analysed urine sample. For the use of urinary ribonucleoside profiling in clinical biomarker studies, adjustment of the urine samples to a common concentration prior to sample preparation is therefore advocated. Changes in the mass spectrometer response should be accounted for by the use of an internal standard added after sample preparation. Diurnal variation exceeded inter-day variation of an individual's ribonucleoside profile, but inter-person differences were predominant and allowed the separation of individuals against each other in a multivariate space. Due to considerable diurnal variation the use of spot urine samples would introduce unnecessary variation and should be replaced by the collection of multiple spot urine samples across the day, where possible. Should such a protocol not be feasible, biological intra-day and inter-day variation must be considered and accounted for in the data interpretation.
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Affiliation(s)
- Friederike Teichert
- Cancer Biomarkers and Prevention Group, Biocentre, Department of Cancer Studies and Molecular Medicine, University of Leicester, University Road, Leicester LE1 7RH, UK.
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Henneges C, Bullinger D, Fux R, Friese N, Seeger H, Neubauer H, Laufer S, Gleiter CH, Schwab M, Zell A, Kammerer B. Prediction of breast cancer by profiling of urinary RNA metabolites using Support Vector Machine-based feature selection. BMC Cancer 2009; 9:104. [PMID: 19344524 PMCID: PMC2680413 DOI: 10.1186/1471-2407-9-104] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Accepted: 04/05/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Breast cancer belongs to the most frequent and severe cancer types in human. Since excretion of modified nucleosides from increased RNA metabolism has been proposed as a potential target in pathogenesis of breast cancer, the aim of the present study was to elucidate the predictability of breast cancer by means of urinary excreted nucleosides. METHODS We analyzed urine samples from 85 breast cancer women and respective healthy controls to assess the metabolic profiles of nucleosides by a comprehensive bioinformatic approach. All included nucleosides/ribosylated metabolites were isolated by cis-diol specific affinity chromatography and measured with liquid chromatography ion trap mass spectrometry (LC-ITMS). A valid set of urinary metabolites was selected by exclusion of all candidates with poor linearity and/or reproducibility in the analytical setting. The bioinformatic tool of Oscillating Search Algorithm for Feature Selection (OSAF) was applied to iteratively improve features for training of Support Vector Machines (SVM) to better predict breast cancer. RESULTS After identification of 51 nucleosides/ribosylated metabolites in the urine of breast cancer women and/or controls by LC- ITMS coupling, a valid set of 35 candidates was selected for subsequent computational analyses. OSAF resulted in 44 pairwise ratios of metabolite features by iterative optimization. Based on this approach ultimately estimates for sensitivity and specificity of 83.5% and 90.6% were obtained for best prediction of breast cancer. The classification performance was dominated by metabolite pairs with SAH which highlights its importance for RNA methylation in cancer pathogenesis. CONCLUSION Extensive RNA-pathway analysis based on mass spectrometric analysis of metabolites and subsequent bioinformatic feature selection allowed for the identification of significant metabolic features related to breast cancer pathogenesis. The combination of mass spectrometric analysis and subsequent SVM-based feature selection represents a promising tool for the development of a non-invasive prediction system.
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Affiliation(s)
- Carsten Henneges
- Center for Bioinformatics Tübingen (ZBIT), Sand 1, D-72076 Tübingen, Germany.
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Bullinger D, Fux R, Nicholson G, Plontke S, Belka C, Laufer S, Gleiter CH, Kammerer B. Identification of urinary modified nucleosides and ribosylated metabolites in humans via combined ESI-FTICR MS and ESI-IT MS analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:1500-1513. [PMID: 18657436 DOI: 10.1016/j.jasms.2008.06.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 06/19/2008] [Accepted: 06/20/2008] [Indexed: 05/26/2023]
Abstract
The physiological response of the human body to several diseases can be reflected by the metabolite pattern in biological fluids. Cancer, like other diseases accompanied by metabolic disorders, causes characteristic effects on cell turnover rate, activity of modifying enzymes, and RNA/DNA modifications. This results in an altered excretion of modified nucleosides and biochemically related compounds. In the course of our metabolic profiling project, we screened 24-h urine of patients suffering from lung, rectal, or head and neck cancer for previously unknown ribosylated metabolites. Therefore, we developed a sample preparation procedure based on boronate affinity chromatography followed by additional prepurification with preparative TLC. The isolated metabolites were analyzed by ion trap mass spectrometry (IT MS) and Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS). IT MS was applied for LC-auto MS(3) screening runs and MS(n(n=4-6)) syringe pump infusion experiments, yielding characteristic fragmentation patterns. FTICR MS measurements enabled the calculation of corresponding molecular formulae based on accurate mass determination (mass accuracy: 1-5 ppm for external and sub-ppm values for internal calibration). We were able to identify 22 metabolites deriving from cellular RNA metabolism and related metabolic pathways like histidine metabolism, purine biosynthesis, methionine/polyamine cycle, and nicotinate/nicotinamide metabolism. The compounds 1-ribosyl-3-hydroxypyridinium, 1-ribosyl-pyridinium, and 3-ribosyl-1-methyl-l-histidinium as well as a series of ribosylated histamines, conjugated to carboxylic acids at the N(omega)-position were found as novel urinary constituents. The occurrence of the modified nucleosides 2-methylthio-N(6)-(cis-hydroxyisopentenyl)-adenosine, 5-methoxycarbonylmethyl-2-thiouridine, N(6)-methyl-N(6)-threonylcarbamoyladenosine, and 2-methylthio-N(6)-threonylcarbamoyladenosine in human urine is verified for the first time.
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Affiliation(s)
- Dino Bullinger
- Department of Clinical Pharmacology, Institute of Pharmacology and Toxicology, University Hospital Tübingen, Tübingen, Germany
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Bullinger D, Fröhlich H, Klaus F, Neubauer H, Frickenschmidt A, Henneges C, Zell A, Laufer S, Gleiter CH, Liebich H, Kammerer B. Bioinformatical evaluation of modified nucleosides as biomedical markers in diagnosis of breast cancer. Anal Chim Acta 2008; 618:29-34. [DOI: 10.1016/j.aca.2008.04.048] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2008] [Revised: 04/17/2008] [Accepted: 04/18/2008] [Indexed: 11/28/2022]
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Metabolic signature of breast cancer cell line MCF-7: profiling of modified nucleosides via LC-IT MS coupling. BMC BIOCHEMISTRY 2007; 8:25. [PMID: 18047657 PMCID: PMC2219991 DOI: 10.1186/1471-2091-8-25] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Accepted: 11/29/2007] [Indexed: 11/22/2022]
Abstract
Background Cancer, like other diseases accompanied by strong metabolic disorders, shows characteristic effects on cell turnover rate, activity of modifying enzymes and DNA/RNA modifications, resulting also in elevated amounts of excreted modified nucleosides. For a better understanding of the impaired RNA metabolism in breast cancer cells, we screened these metabolites in the cell culture supernatants of the breast cancer cell line MCF-7 and compared it to the human mammary epithelial cells MCF-10A. The nucleosides were isolated and analyzed via 2D-chromatographic techniques: In the first dimension by cis-diol specific boronate affinity extraction and subsequently by reversed phase chromatography coupled to an ion trap mass spectrometer. Results Besides the determination of ribonucleosides, additional compounds with cis-diol structure, deriving from cross-linked biochemical pathways, like purine-, histidine- and polyamine metabolism were detected. In total, 36 metabolites were identified by comparison of fragmentation patterns and retention time. Relation to the internal standard isoguanosine yielded normalized area ratios for each identified compound and enabled a semi-quantitative metabolic signature of both analyzed cell lines. 13 of the identified 26 modified ribonucleosides were elevated in the cell culture supernatants of MCF-7 cells, with 5-methyluridine, N2,N2,7-trimethylguanosine, N6-methyl-N6-threonylcarbamoyladenosine and 3-(3-aminocarboxypropyl)-uridine showing the most significant differences. 1-ribosylimidazole-4-acetic acid, a histamine metabolite, was solely found in the supernatants of MCF-10A cells, whereas 1-ribosyl-4-carboxamido-5-aminoimidazole and S-adenosylmethionine occurred only in supernatants of MCF-7 cells. Conclusion The obtained results are discussed against the background of pathological changes in cell metabolism, resulting in new perspectives for modified nucleosides and related metabolites as possible biomedical markers for breast carcinoma in vivo.
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Wang S, Zhao X, Mao Y, Cheng Y. Novel approach for developing urinary nucleosides profile by capillary electrophoresis–mass spectrometry. J Chromatogr A 2007; 1147:254-60. [PMID: 17336316 DOI: 10.1016/j.chroma.2007.02.049] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2006] [Revised: 02/13/2007] [Accepted: 02/15/2007] [Indexed: 11/19/2022]
Abstract
A simple, rapid and efficient capillary electrophoresis-mass spectrometry (CE-MS) method was developed to analyze urinary nucleosides for the first time. The composition of CE buffer and MS parameters were systematically optimized. The optimum buffer was 150 mM acetic acid containing 15% methanol and 15% ethanol. The optimum MS parameters were: methanol containing 0.5% acetic acid was selected as the sheath liquid and the flow rate was 5 microL/min; the flow rate and temperature of drying gas were 6L/min and 150 degrees C, respectively; the pressure of nebulizing gas was 2 psig; and the fragmentor and ESI voltage were 100 V and 4000 V, respectively. Under the optimum CE-MS conditions, the urinary nucleosides were separated within 18 min. The linearity between the relative peak areas and the corresponding concentration of nine nucleosides markers were excellent. The limits of detection (S/N=3) of markers were 0.00862-3.82 nmol/mL. The optimum CE-MS method was applied to analyze urine from 20 bladder cancer patients and 20 healthy volunteers. Considering the standards of many nucleosides cannot be obtained, it is not the ratios of the concentrations of nucleosides to that of creatinine in the literatures, but the ratios of the relative peak area of nucleosides to the concentration of creatinine that used for pattern recognition. And, the statistical analysis result indicated this method was feasible.
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Affiliation(s)
- Shufang Wang
- Pharmaceutical Informatics Institute, Zhejiang University, Hangzhou 310058, China
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21
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Urinary pseudouridine in patients with lymphoma: Comparison with other clinical parameters. Clin Chim Acta 2006; 371:148-51. [DOI: 10.1016/j.cca.2006.03.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2006] [Accepted: 03/01/2006] [Indexed: 11/23/2022]
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22
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Cho SH, Jung BH, Lee SH, Lee WY, Kong G, Chung BC. Direct determination of nucleosides in the urine of patients with breast cancer using column-switching liquid chromatography–tandem mass spectrometry. Biomed Chromatogr 2006; 20:1229-36. [PMID: 16799933 DOI: 10.1002/bmc.689] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We developed an analytical method for a simple, sensitive and simultaneous determination of oxidized nucleosides in urine using column-switching liquid chromatography-electrospray/tandem mass spectrometry (LC-ESI/MS/MS). We connected two columns through a six-way switching valve and effectively separated nucleosides in the urine from the interference by column-switching liquid chromatography. We monitored separated nucleosides using positive ionization tandem mass spectrometry in selective reaction monitoring (SRM) mode. The calibration ranges of nucleosides were 0.2-100 nmol/mL. The linearity of the method was 0.994-0.999, and the limits-of-detection (LOD) at a signal-to-noise (S/N) ratio of 3 were 0.1-0.2 nmol/mL. The coefficients of variation were in the range 2.28-11.74% for within-day variation and 4.36-11.15% for day-to-day variation, respectively. To explore the relationship between breast cancer and the nucleosides level in human urine, we measured the concentrations of nucleosides in female patients with breast cancer (n = 30) and in normal female subjects (n = 30). The concentration of nucleosides was significantly increased in patients with breast cancer when compared with the normal controls (1-methyladenosine; p < 0.005, N(2),N(2)-dimethylguanosine; p < 0.01, 5-hydroxymethyl-2'-deoxyuridine; p < 0.001, 8-hydroxy-2-deoxyguanosine; p < 0.001). Therefore, the elevated levels of nucleosides could be used as an important biomarker for breast-cancer research.
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Affiliation(s)
- Sung-Hee Cho
- Bioanalysis and Biotransformation Research Center, KIST, Chengryang, Seoul 130-605, Korea
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Kammerer B, Frickenschmidt A, Gleiter CH, Laufer S, Liebich H. MALDI-TOF MS analysis of urinary nucleosides. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2005; 16:940-7. [PMID: 15907708 DOI: 10.1016/j.jasms.2005.02.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2004] [Revised: 02/14/2005] [Accepted: 02/14/2005] [Indexed: 05/02/2023]
Abstract
As RNA turnover seems to be impaired in cancer patients, modified nucleosides have been evaluated as potential tumor markers. Modified nucleosides are mainly formed post-transcriptionally in tRNA, set free during RNA metabolism, and excreted in urine. Especially methylated nucleosides play an important role, as their levels are higher in urine from cancer patients. For structural elucidation of known and unknown nucleosides from urine samples of cancer patients, MALDI-TOF MS and MALDI-PSD were used for the first time. This technique generally ensures high sensitivity, mass resolution, and accuracy. In our analytical approach we prepurified nucleosides from urine by affinity chromatography and subsequently separated them by semipreparative high performance liquid chromatography. The different fractions were collected separately and analyzed by MALDI-TOF MS and PSD-MALDI using a mixture of six low molecular weight calibrants for internal or external calibration. The molecular totals formulas based on a mass accuracy of 10 ppm and below were calculated and a systematic data base search was performed. The inherent problem of the MALDI-technique, the reduced sensitivity for low molecular weight substances caused by matrix suppression effects, was reduced by our technique. We identified several nucleosides in urine, which were previously identified via retention times and UV spectra of standards after HPLC analysis. Eight further nucleosides were observed. This work demonstrates for the first time the potential of MALDI-TOF and PSD-MALDI in combination with semipreparative HPLC for assignment of nucleosides in urine. The particularly high mass accuracy of this mass spectrometric method provides opportunities for identifying unknown compounds.
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Affiliation(s)
- Bernd Kammerer
- Institute of Pharmacology and Toxicology, Division of Clinical Pharmacology, University Hospital Tübingen, Otfried-Müller Strasse 45, D-72076 Tübingen, Germany.
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Kammerer B, Frickenschmidt A, Müller CE, Laufer S, Gleiter CH, Liebich H. Mass spectrometric identification of modified urinary nucleosides used as potential biomedical markers by LC–ITMS coupling. Anal Bioanal Chem 2005; 382:1017-26. [PMID: 15906010 DOI: 10.1007/s00216-005-3232-2] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2004] [Revised: 03/12/2005] [Accepted: 03/24/2005] [Indexed: 10/25/2022]
Abstract
In diseases accompanied by strong metabolic disorders, like cancer and AIDS, modifying enzymes are up- or down-regulated. As a result, many different types of metabolic end-products, including abnormal amounts of modified nucleosides, are found in urine. These nucleosides are degradation products of an impaired ribonucleic acid (RNA) metabolism, which affects the nucleoside pattern in urine. In several basic experiments we elucidated the fragmentation pathways of 16 characteristic nucleosides and six corresponding nucleic bases that occur in urine using electrospray ionization ion trap MS(5) (ESI-ITMS) experiments operated in positive ionization mode. For urinary nucleoside analysis, we developed an auto-LC-MS3 method based on prepurification via boronate gel affinity chromatography followed by reversed phase chromatography. For this purpose, an endcapped LiChroCART Superspher RP 18 column with a gradient of ammonium formate and a methanol-water mixture was used. This method gives a limit of detection of between 0.1 and 9.6 pmol for 15 standard nucleosides, depending on the basicity of the nucleoside. Overall, the detection of 36 nucleosides from urine was feasible. It was shown that this auto-LC-MS3 method is a valuable tool for assigning nucleosides from complex biological matrices, and it may be utilized in the diagnosis of diseases associated with disorders in RNA metabolism.
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Affiliation(s)
- Bernd Kammerer
- Department of Clinical Pharmacology, University Hospital Tübingen, Otfried-Müller-Str. 45, 72076 Tübingen, Germany.
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Zheng Y, Xu G, Yang J, Zhao X, Pang T, Kong H. Determination of urinary nucleosides by direct injection and coupled-column high-performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 819:85-90. [PMID: 15797525 DOI: 10.1016/j.jchromb.2005.01.033] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Accepted: 01/31/2005] [Indexed: 11/20/2022]
Abstract
A coupled-column liquid chromatographic method for the direct analysis of 14 urinary nucleosides is described. Efficient on-line clean-up and concentration of 14 nucleosides from urine samples were obtained by using a boronic acid-substituted silica column (40 mm x 4.0 mm I.D.) as the first column (Col-1) and a Hypersil ODS2 column (250 mm x 4.6 mm I.D.) as the second column (Col-2). The mobile phases applied consisted of 0.25 mol/L ammonium acetate (pH 8.5) on Col-1, and of 25 mmol/L potassium dihydrogen phosphate (pH 4.5) on Col-2, respectively. Determination of urinary nucleosides was performed on Col-2 column by using a linear gradient elution comprising 25 mmol/L potassium dihydrogen phosphate (pH 4.5) and methanol-water (60:40, v/v) with UV detection at 260 nm. Urinary nucleosides analysis can be carried out by this procedure in 50 min requiring only pH adjustment and the protein precipitation by centrifugation of urine samples. Calibration plots of 14 standard nucleosides showed excellent linearity (r > 0.995) and the limits of detection were at micromolar levels. Both of intra- and inter-day precisions of the method were better than 6.6% for direct determination of 14 nucleosides. The validated method was applied to quantify 14 nucleosides in 20 normal urines to establish reference ranges.
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Affiliation(s)
- Yufang Zheng
- National Chromatographic R&A Center, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Dalian 116023, China
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26
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Zheng YF, Kong HW, Xiong JH, Lv S, Xu GW. Clinical significance and prognostic value of urinary nucleosides in breast cancer patients. Clin Biochem 2005; 38:24-30. [PMID: 15607313 DOI: 10.1016/j.clinbiochem.2004.09.021] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2003] [Revised: 02/26/2004] [Accepted: 09/16/2004] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Thirteen urinary nucleosides, primarily degradation products of tRNA, were evaluated as potential tumor markers for breast cancer patients. DESIGN AND METHODS The micellar electrokinetic chromatography (MEKC) method has been used to analyze the urinary nucleosides in 41 healthy controls, 20 patients with benign breast tumors, and 26 breast cancer patients. RESULTS Urinary nucleoside concentrations of breast cancer patients were found to increase significantly compared to those of patients with benign breast tumors and healthy controls. By using 13 nucleoside concentrations as data vectors for principal component analysis (PCA), 73% (19/26) of breast cancer patients were correctly identified from healthy controls, while only 20% (4/20) of patients with benign breast tumors were indistinguishable from breast cancer patients. The mean level of all forms of urinary nucleosides in patients with metastatic breast cancer was higher than that in patients with primary breast cancer. The levels of modified nucleosides tended to decrease and return to normal after surgery. CONCLUSION The results indicate that urinary nucleosides may be useful as tumor markers for breast cancer.
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Affiliation(s)
- Yu-Fang Zheng
- National Chromatographic R&A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116011, PR China
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27
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Ishiwata S, Ozawa Y, Katayama J, Kaneko S, Shindo H, Tomioka Y, Ishiwata T, Asano G, Ikegawa S, Mizugaki M. Elevated expression level of 60-kDa subunit of tRNA-guanine transglycosylase in colon cancer. Cancer Lett 2004; 212:113-9. [PMID: 15246567 DOI: 10.1016/j.canlet.2004.03.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2003] [Revised: 03/01/2004] [Accepted: 03/08/2004] [Indexed: 11/22/2022]
Abstract
tRNA-guanine transglycosylase (TGT) is an enzyme which synthesizes a modified nucleoside, queuosine, by exchanging the base moiety of guanosine for queuine in tRNA. We have reported that the expression level of the 60-kDa subunit of TGT (TGT60kD) is elevated in leukemic cells, however, there is no other report on the expression of TGT60kD in cancer cells. The expression levels of the TGT60kD protein are elevated in four of the five colon cancer cell lines and 83% of colon cancer tissues compared with normal tissues. The expression levels of the TGT60kD protein decreased in two colon cancer cell lines, after cell differentiation was induced. A marked positive staining of cancer cells in colon tissues was observed, and the subcellular staining pattern was mainly cytosolic. These data suggest that the role of TGT60kD in colon carcinogenesis.
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Affiliation(s)
- Shunji Ishiwata
- Department of Pharmaceutical Sciences, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan.
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28
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Kim KR, La S, Kim A, Kim JH, Liebich HM. Capillary electrophoretic profiling and pattern recognition analysis of urinary nucleosides from uterine myoma and cervical cancer patients. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 754:97-106. [PMID: 11318432 DOI: 10.1016/s0378-4347(00)00585-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Capillary electrophoretic (CE) profiling analysis combined with pattern recognition methods is described for the correlation between urinary nucleoside profiles and uterine cervical cancer. Nucleosides were extracted from urine specimens by solid-phase extraction in affinity mode using phenylboronic acid gel. CE separation was carried out with an uncoated fused-silica capillary (570 mm x 50 microm I.D.) maintained at 20 degrees C, using 25 mM borate-42.5 mM phosphate buffer (pH 6.7) containing 200 mM sodium dodecyl sulfate as the run buffer under the applied voltage of 20 kV. A total of 15 nucleosides were positively identified in urine samples (2 ml) from eight uterine myoma (benign tumor group), 10 uterine cervical cancer (malignant tumor group) patients and 10 healthy females (normal group) studied. The star symbol plots drawn based on each mean concentration of nucleosides normalized to that in normal group enabled one to discriminate malignant and benign groups from normal group. In addition, canonical discriminant analysis performed on the nucleoside data of 28 individual urine specimens correctly classified into three separate clusters according to groups in the canonical plot.
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Affiliation(s)
- K R Kim
- College of Pharmacy, Sungkyunkwan University, Suwon, South Korea.
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29
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30
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Xu G, Di Stefano C, Liebich HM, Zhang Y, Lu P. Reversed-phase high-performance liquid chromatographic investigation of urinary normal and modified nucleosides of cancer patients. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 732:307-13. [PMID: 10517352 DOI: 10.1016/s0378-4347(99)00296-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Post-transcriptional modifications in RNA give rise to free modified ribonucleosides circulating in the blood stream and excreted in urine. Due to their abnormal levels in conjunction with several tumor diseases, they have been suggested as possible tumor markers. The developed RP-HPLC method has been applied to analyze the urinary nucleosides in 34 urinary samples from 15 kinds of cancer patients. The statistical analyses showed the urinary nucleoside excretion, especially modified nucleoside levels, in cancer patients were significantly higher than those in normal healthy volunteers. Factor analysis was used to classify the patients with cancer and normal healthy humans. It was found that using 15 urinary nucleoside levels or only five modified nucleoside levels as data vectors the factor analysis plot displayed two almost separate clusters representing each group.
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Affiliation(s)
- G Xu
- National Chromatographic R&A Center, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences.
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31
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Kobayashi H, Kobayashi M, Heming TA, Bidani A, Pollard RB, Suzuki F. Cytokine production by rabbit alveolar macrophages: differences between activated and suppressor cell phenotypes. Immunol Lett 1999; 69:339-46. [PMID: 10528798 DOI: 10.1016/s0165-2478(99)00114-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The differences between cytokine-producing profiles of activated macrophages (A-M phi) and suppressor macrophages (S-M phi) were examined. A-M phi, which exhibited cytotoxicity against RK-13 cells, were generated from resident rabbit alveolar M phi by treatment with lymphokine solution (culture fluids of rabbit spleen cells stimulated with concanavalin A [Con A]). S-M phi, which were able to inhibit cellular proliferations of rabbit spleen cells stimulated with Con A, were generated from resident alveolar M phi by treatment with 1-methyladenosine (an immunosuppressive molecule in tumourous ascites fluids). When A-M phi were stimulated with lipopolysaccharide (LPS) in vitro, the cells produced significantly more interleukin (IL)-1 (approximately 1.4 times), IL-6 (approximately 2.1 times), IL-12 (approximately 60 times), and tumour necrosis factor-alpha (TNF-alpha) (approximately 37 times) than did resting macrophages (R-M phi) stimulated with LPS as control cells. After the stimulation with LPS, both A-M phi and R-M phi did not produce transforming growth factor-beta (TGF-beta). In contrast, when S-M phi were stimulated with LPS in vitro, the cells produced significantly more TGF-beta (approximately 1.6 times) and significantly less IL-6 (approximately 1.8 times) than did control cells. Also, S-M phi did not produce IL-1, IL-12, and TNF-alpha into their culture fluids after the stimulation with LPS. These results show the differences between cytokine-producing profiles of A-M phi and S-M phi, and characteristics of their cytokine-producing profiles are analogous to T cell subsets. Differences displayed in the cytokine profiles may contribute to the effector (A-M phi) or the suppressor (S-M phi) functions of alveolar M phi.
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Affiliation(s)
- H Kobayashi
- Department of Internal Medicine, The University of Texas Medical Branch, Galveston 77555-0835, USA
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Honda I, Itoh K, Mizugaki M, Sasaki T. Creatinine at the evaluation of urinary 1-methyladenosine and pseudouridine excretion. TOHOKU J EXP MED 1999; 188:133-8. [PMID: 10526874 DOI: 10.1620/tjem.188.133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The elevation of urinary modified nucleosides levels in urine is found in patients with cancers. In the present study, we have tested 616 urine samples randomly collected from non-malignant cases. Thirty-two percent (194/616) and 11% (68/616) had elevated levels of 1-methyladenosine and pseudouridine, respectively (They are designated as false-positive cases). To elucidate the cause on non-specific elevation of the nucleosides, the correlation between creatinine excretion level and urinary nucleosides levels were determined. The result revealed that false-positive cases were frequently detected in patients with lower creatinine excretion levels. The mean creatinine levels of false-positive cases were significantly lower than those of negative cases. From these results, the false-positive of urinary 1-methyladenosine and pseudouridine might be due to the low creatinine excretion mainly caused by the renal dysfunction. Creatinine excretion in each individual should be taken into consideration in case of determining urinary modified nucleosides.
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Affiliation(s)
- I Honda
- Department of Clinical and Laboratory Medicine, Tohoku University School of Medicine, Sendai, Japan
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Itoh K, Suzuki K, Ishiwata S, Tezuka T, Mizugaki M, Suzuki T. Application of a recombinant Fab fragment from a phage display library for sensitive detection of a target antigen by an inhibition ELISA system. J Immunol Methods 1999; 223:107-14. [PMID: 10037238 DOI: 10.1016/s0022-1759(98)00209-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We have found that the recombinant Fab (rFab) produced by phage display system was detectable for a target antigen more sensitive than the parental monoclonal antibody (MoAb). The Fab phage display library was constructed from hybridoma cells producing APU-6 MoAb specific for a modified nucleoside, pseudouridine that have been studied as a urinary marker for malignancy. Fab-displayed phage clones were screened by a direct ELISA, and the single positive clone was finally obtained. Although the reaction pattern of rFab against pseudouridine and uridine was almost identical to that of MoAb, detection sensitivity of rFab was approximately 30 times higher than that of MoAb. Since the sensitivity of rFab was almost identical to that of Fab fragment prepared by papain digestion of MoAb, the increased sensitivity is considered to be the nature of Fab fragment. The sensitivity of established assay system was sufficient for quantitative determination of serum pseudouridine levels in healthy individuals and cancer patients. This procedure may be applicable for improvement of detection sensitivity of a MoAb-based inhibition ELISA system for drugs or low molecular weight compounds.
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Affiliation(s)
- K Itoh
- Department of Pharmaceutical Science, Akita University Hospital, Japan
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Kim KR, Park HG, Paik MJ, Ryu HS, Oh KS, Myung SW, Liebich HM. Gas chromatographic profiling and pattern recognition analysis of urinary organic acids from uterine myoma patients and cervical cancer patients. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 712:11-22. [PMID: 9698224 DOI: 10.1016/s0378-4347(98)00155-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient organic acid profiling and pattern recognition method is described for the correlation between urinary organic acid profiles and uterine cervical cancer. After methoximation of keto acids in alkalinized urine samples, all free organic acids were recovered by a dual solid-phase extraction procedure, followed by conversion to tert.-butyldimethylsilyl derivatives for the profiling analysis by dual-capillary column gas chromatography (GC) with subsequent screening for acids by retention index (I) library matching. A total of 50 organic acids were positively identified in urine samples (0.25 ml) from 12 uterine myoma (benign tumor group) and 14 uterine cervical cancer (malignant tumor group) patients studied. When the GC profiles were simplified to their corresponding organic acid I spectra in bar graphical form, characteristic patterns were obtained for each average of benign and malignant tumor groups. Stepwise discriminant analysis performed on the GC data selected 16 acids as the variables discriminating between the two groups. Canonical discriminant analysis applied to these 16 variables correctly classified 26 urine samples into two separate clusters according to tumor types in the canonical plot.
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Affiliation(s)
- K R Kim
- College of Pharmacy, Sungkyunkwan University, Suwon, South Korea
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35
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Abstract
The methods of analysis, origins, and clinical significance of urinary nucleosides are reviewed through 1997. Structures, chromatographic and mass spectral data and references to the clinical literature are presented for each of the 57 nucleosides currently identified in normal and pathogenic human urine samples. Data from the HPLC separation and GC/MS analysis of 37 individual HPLC fractions are presented and discussed. Methods, including sample preparation techniques, used for the analysis of urinary nucleosides including GC, HPLC, GC/MS, HPLC/MS and immunoassays are compared and the advantages and limitations of each method described. The conclusion is drawn that the urinary nucleosides do serve as biomarkers of cancer and other diseases, but analytical methods need further improvement if clinical decisions are to be made based on the levels of nucleosides in human urine.
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Affiliation(s)
- K H Schram
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Arizona, Tucson 85721, USA
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Liebich HM, Di Stefano C, Wixforth A, Schmid HR. Quantitation of urinary nucleosides by high-performance liquid chromatography. J Chromatogr A 1997; 763:193-7. [PMID: 9129323 DOI: 10.1016/s0021-9673(96)00757-1] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
It is known that some modified, especially methylated, nucleosides originating from RNA degradation are excreted in abnormal levels in the urine of patients with malignant tumours and they have been proposed as tumour markers. Their measurement could provide a non-invasive diagnostic method, be helpful in the identification of different cancers and in the monitoring of therapeutic effects. In this study, we developed and optimized an analytical procedure to isolate and quantify normal and modified ribonucleosides. The extraction of urinary nucleosides was performed by affinity chromatography on a phenylboronic acid column prior to separation. The reversed-phase high-performance liquid chromatography method allowed a complete separation of sixteen urinary ribonucleosides. The recoveries for the different nucleosides ranged from 83 to 100%, except for xanthosine (66%) and pseudouridine (74%). In normal 24 h urine, the mean levels of thirteen nucleosides (in nmol of nucleoside/mumol of creatinine) were found to be as follows: dihydrouridine (6.37), pseudouridine (25.52), cytidine (0.07), uridine (0.21), 1-methyladenosine (2.19), inosine (0.30), guanosine (0.06), xanthosine (0.59), 3-methyluridine (0.11), 1-methylinosine (1.13). 1-methylguanosine (0.74), adenosine (0.21) and 5'-deoxy-5'-methylthioadenosine (0.12). The first results concerning two kinds of tumours, i.e. breast and floor of mouth tumours, showed some abnormal levels of ribonucleosides. Further experiments are now in progress to measure the modified nucleosides in urine of patients with different forms of cancer.
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Affiliation(s)
- H M Liebich
- Medizinische Universitätsklinik, Tübingen, Germany
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Colonna A, Guadagnino V, Maiorano A, Stamile E, Costa C. Pseudouridine for monitoring interferon treatment of patients with chronic hepatitis C. EUROPEAN JOURNAL OF CLINICAL CHEMISTRY AND CLINICAL BIOCHEMISTRY : JOURNAL OF THE FORUM OF EUROPEAN CLINICAL CHEMISTRY SOCIETIES 1996; 34:697-700. [PMID: 8891521 DOI: 10.1515/cclm.1996.34.9.697] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Pseudouridine is a modified nucleoside derived from RNA catabolism; the concentration of this nucleoside is elevated in body fluids of both tumour-bearing and human immunodeficiency virus (HIV) infected patients. We used an HPLC procedure to evaluate the serum pseudouridine concentration in patients with chronic hepatitis C in an attempt to determine whether the nucleoside serum concentration was related to the response to alpha-interferon treatment. We found that: a) pseudouridine serum concentration was increased significantly in 76% (29/39) of patients with chronic hepatitis C at the time of diagnosis and before any therapeutic treatment; b) pseudouridine excretion was higher in patients affected by chronic hepatitis C with cirrhosis; c) there was a positive correlation between response to therapy and pseudouridine serum concentration in patients undergoing treatment with alpha-interferon; d) during one year of alpha-interferon treatment, the pseudouridine serum concentration remained within the normal range in responder patients. These results indicate that serum pseudouridine might be useful as a valuable biochemical marker with which to monitor chronic hepatitis C patients treated with alpha-interferon.
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Affiliation(s)
- A Colonna
- Dipartimento di Farmacologia Sperimentale, Università di Napoli Federico II, Italy
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Marway JS, Anderson GJ, Miell JP, Ross R, Grimble GK, Bonner AB, Gibbons WA, Peters TJ, Preedy VR. Application of proton NMR spectroscopy to measurement of whole-body RNA degradation rates: effects of surgical stress in human patients. Clin Chim Acta 1996; 252:123-35. [PMID: 8853560 DOI: 10.1016/0009-8981(96)06300-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The urinary catabolites, N2,N2-dimethylguanosine (DMG), pseudouridine (PSU) and 7-methylguanine (m7-Gua) are formed from post-transcriptional methylation of RNA bases and are not reincorporated into RNA upon its degradation. Their quantitative urinary excretion may be used to determine rates of whole body degradation of individual RNA species since DMG occurs exclusively in tRNA, PSU occurs in rRNA and tRNA and m7-Gua occurs in all RNA species. Conventional HPLC analysis has several drawbacks since pre-analytical steps may involve selective losses and, under certain conditions, other urinary analytes may co-elute. In the present paper, we report analysis of these compounds by high-field 1H-nuclear magnetic resonance (1H-NMR) spectroscopy. Urinary concentrations of these metabolites were found to be in agreement with previously published HPLC and ELISA determinations. However, NMR analysis required minimal sample preparation (other than lyophilisation and reconstitution) and was capable of the simultaneous determination of other relevant analytes such as creatinine. This technique was therefore applied to urine samples from patients who had undergone surgical stress and insulin-like growth factor-1 (IGF-I) therapy. Surgical stress increased the excretion of DMG and m7-Gua. Degradation rates for tRNA and mRNA were also higher in surgically stressed subjects when compared with controls but degradation rates of rRNA decreased by approx. 30%. However, injection of IGF-I (40 micrograms/kg s.c.) had no significant effect on the excretion of these nucleosides. These data indicated that IGF-I therapy has no marked effects on RNA turnover following trauma. We suggest that this technique can be applied to study of RNA metabolism in any surgical or medical condition. Furthermore, since only 0.6 ml of urine is required, studies in neonates seem to be feasible.
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Affiliation(s)
- J S Marway
- Tissue Pathology Unit, Roehampton Institute London, West Hill, UK
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Buchet JP, Ferreira M, Burrion JB, Leroy T, Kirsch-Volders M, Van Hummelen P, Jacques J, Cupers L, Delavignette JP, Lauwerys R. Tumor markers in serum, polyamines and modified nucleosides in urine, and cytogenetic aberrations in lymphocytes of workers exposed to polycyclic aromatic hydrocarbons. Am J Ind Med 1995; 27:523-43. [PMID: 7793423 DOI: 10.1002/ajim.4700270406] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Some polycyclic aromatic hydrocarbons (PAHs) such as benzo(a)pyrene and benzo(a)anthracene are well-established genotoxic agents. Long-term exposure to PAHs may lead to proliferative cell disorders in humans, predominantly in the skin, lung, and bladder. The concentration of several tumor markers in serum, of polyamines and modified nucleosides in urine, and of cytogenetic endpoints in peripheral lymphocytes (sister-chromatid exchanges, high frequency cells [HFC], and micronuclei) were measured in 149 male workers exposed to PAHs in two coke oven and one graphite electrode plants, and in 137 controls. We have assessed whether these biomarkers were related to several parameters reflecting exposure to PAHs, i.e., the sum of the airborne concentration of 13 PAHs, 1-hydroxypyrene (1-OHP) concentration in postshift urine, benzo(a)pyrene-diolepoxide adducts to hemoglobin (BPDE-Hb adducts), and duration of exposure, taking also into account several possible confounding factors. HFC was the biomarker most consistently associated with the intensity of current exposure to PAHs. Smoking exerts an independent effect on the same parameter. On the basis of the logistic regression between the prevalence of abnormal HFC values and PAHs in air and 1-OHP in postshift urine found in nonsmokers, it is suggested that the latter should be kept below 6.4 micrograms/m3 and 2.7 micrograms/g creatinine, respectively. No relationship was found between the cytogenetic effects and BPDE-Hb adducts although both parameters are statistically correlated with the airborne PAH level. Some tumor markers in serum (carcinoembryonic antigen, tissue polypeptide antigen, sialic acid) and the urinary concentration of some polyamines were correlated with either PAHs in air or 1-OHP in urine. The associations, however, were very weak which suggests that these biomarkers have limited practical value for the health surveillance of groups of workers exposed to genotoxic PAHs.
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Affiliation(s)
- J P Buchet
- Industrial Toxicology and Occupational Medicine Unit, Faculty of Medicine, Catholic University Louvain, Brussels, Belgium
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Itoh K, Aida S, Ishiwata S, Yamaguchi T, Ishida N, Mizugaki M. Immunochemical detection of urinary 5-methyl-2'-deoxycytidine as a potential biologic marker for leukemia. Clin Chim Acta 1995; 234:37-45. [PMID: 7758221 DOI: 10.1016/0009-8981(94)05986-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A monoclonal antibody against 5-methylcytidine was prepared and characterized. This antibody, termed AMC, was reactive with compounds that had 5-methylcytosine structure (i.e. 5-methyl-2'-deoxycytidine, 5-methylcytidine and 5-methylcytosine). AMC had the highest reactivity to 5-methyl-2'-deoxycytidine among reactive compounds and had no or very slight cross-reactivity to cytidine-related compounds and any other compounds. Analysis of immunoreactive materials in urine revealed that 5-methyl-2'-deoxycytidine rather than 5-methylcytidine was, contrary to our expectation, the major component. Then the inhibition ELISA system using AMC was established and urinary levels of 5-methyl-2'-deoxycytidine in healthy individuals and cancer patients were determined. The mean excretion levels of healthy individuals was 0.90 +/- 0.43 nmol/mumol creatinine and the cut-off value was set at the mean + 2 S.D. of healthy individuals (1.76 nmol/mumol creatinine). Among various types of cancer tested, elevated levels of 5-methyl-2'-deoxycytidine were detected in leukemia patients. From these results, urinary 5-methyl-2'-deoxycytidine might be applicable as a biologic marker for leukemia.
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Affiliation(s)
- K Itoh
- Department of Pharmaceutical Sciences, Tohoku University Hospital, Sendai, Japan
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Marvel CC, Del Rowe J, Bremer EG, Moskal JR. Altered RNA turnover in carcinogenesis. The diagnostic potential of modified base excretion. MOLECULAR AND CHEMICAL NEUROPATHOLOGY 1994; 21:353-68. [PMID: 7522008 DOI: 10.1007/bf02815361] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Excretion of urinary modified nucleosides is frequently elevated in patients with oncogenic disease. Increases of urinary pseudouridine excretion are now demonstrated in patients with a variety of brain tumors. The potential use of urinary modified base excretion as a cancer marker is discussed and possible sources of the elevated nucleosides are detailed. The specific steps in RNA metabolism that result in increased levels of RNA nucleoside excretion are poorly understood. This knowledge will be necessary to understand the molecular mechanism and the clinical significance of urinary nucleoside excretion in treatment and diagnosis of oncogenic disease.
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Affiliation(s)
- C C Marvel
- Department of Radiation Oncology, University of Southern California, Los Angeles
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Pane F, Savoia M, Fortunato G, Camera A, Rotoli B, Salvatore F, Sacchetti L. Serum pseudouridine in the diagnosis of acute leukaemias and as a novel prognostic indicator in acute lymphoblastic leukaemia. Clin Biochem 1993; 26:513-20. [PMID: 8124867 DOI: 10.1016/0009-9120(93)80017-o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The serum level of pseudouridine, a modified nucleoside deriving mainly from t-RNA catabolism, was evaluated in 66 acute leukaemia patients at diagnosis to investigate its diagnostic and prognostic value, and its potential as a parameter with which to classify subtypes of the disease. Serum pseudouridine, measured by high performance liquid chromatography, was increased in acute lymphoblastic leukaemia patients (90% according to the pseudouridine index, which is the serum pseudouridine/creatinine ratio), and in acute myeloblastic leukaemia patients (75% according to the pseudouridine index). The increase was higher in the L3 than in the L1 and L2 subtypes. In the acute lymphoblastic leukaemia group there was a highly significant inverse correlation between serum pseudouridine levels and the most common end-point parameters used to assess disease outcome in leukaemia (i.e., complete remission rate, disease-free survival, and overall survival). In addition, 83% of patients with serum pseudouridine values < 5.5 nmol/mL were alive and in complete remission 12 months after the initial diagnosis, while only 11% of patients with serum pseudouridine values > 5.5 nmol/mL were alive and none were disease-free after the same period. This study: 1. demonstrates that the diagnostic sensitivity of the pseudouridine index is high in adult acute lymphoblastic leukaemia and good in acute myeloblastic leukaemia; 2. suggests that the serum pseudouridine assay can contribute to the classification of adult acute lymphoblastic leukaemia; and 3. demonstrates unequivocally that both pseudouridine assay and the pseudouridine index are excellent independent prognostic markers for acute lymphoblastic leukaemia.
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Affiliation(s)
- F Pane
- Dipartimento di Biochimica e Biotechnologie Mediche, CEINGE Centro Ingegneria Genetica, Naples, Italy
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Itoh K, Aida S, Ishiwata S, Sasaki S, Ishida N, Mizugaki M. Urinary excretion patterns of modified nucleosides, pseudouridine and 1-methyladenosine, in healthy individuals. Clin Chim Acta 1993; 217:221-3. [PMID: 8261632 DOI: 10.1016/0009-8981(93)90170-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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