1
|
Strefeler A, Blanco-Fernandez J, Jourdain AA. Nucleosides are overlooked fuels in central carbon metabolism. Trends Endocrinol Metab 2024; 35:290-299. [PMID: 38423899 DOI: 10.1016/j.tem.2024.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 03/02/2024]
Abstract
From our daily nutrition and synthesis within cells, nucleosides enter the bloodstream and circulate throughout the body and tissues. Nucleosides and nucleotides are classically viewed as precursors of nucleic acids, but recently they have emerged as a novel energy source for central carbon metabolism. Through catabolism by nucleoside phosphorylases, the ribose sugar group is released and can provide substrates for lower steps in glycolysis. In environments with limited glucose, such as at sites of infection or in the tumor microenvironment (TME), cells can use, and may even require, this alternative energy source. Here, we discuss the implications of these new findings in health and disease and speculate on the potential new roles of nucleosides and nucleic acids in energy metabolism.
Collapse
Affiliation(s)
- Abigail Strefeler
- Department of Immunobiology, University of Lausanne, Ch. des Boveresses 155, CP51, 1066 Epalinges, Switzerland
| | - Joan Blanco-Fernandez
- Department of Immunobiology, University of Lausanne, Ch. des Boveresses 155, CP51, 1066 Epalinges, Switzerland
| | - Alexis A Jourdain
- Department of Immunobiology, University of Lausanne, Ch. des Boveresses 155, CP51, 1066 Epalinges, Switzerland.
| |
Collapse
|
2
|
Gao S, Sun Y, Chen X, Zhu C, Liu X, Wang W, Gan L, Lu Y, Schaarschmidt F, Herde M, Witte CP, Chen M. Pyrimidine catabolism is required to prevent the accumulation of 5-methyluridine in RNA. Nucleic Acids Res 2023; 51:7451-7464. [PMID: 37334828 PMCID: PMC10415118 DOI: 10.1093/nar/gkad529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 05/31/2023] [Accepted: 06/08/2023] [Indexed: 06/21/2023] Open
Abstract
5-Methylated cytosine is a frequent modification in eukaryotic RNA and DNA influencing mRNA stability and gene expression. Here we show that free 5-methylcytidine (5mC) and 5-methyl-2'-deoxycytidine are generated from nucleic acid turnover in Arabidopsis thaliana, and elucidate how these cytidines are degraded, which is unclear in eukaryotes. First CYTIDINE DEAMINASE produces 5-methyluridine (5mU) and thymidine which are subsequently hydrolyzed by NUCLEOSIDE HYDROLASE 1 (NSH1) to thymine and ribose or deoxyribose. Interestingly, far more thymine is generated from RNA than from DNA turnover, and most 5mU is directly released from RNA without a 5mC intermediate, since 5-methylated uridine (m5U) is an abundant RNA modification (m5U/U ∼1%) in Arabidopsis. We show that m5U is introduced mainly by tRNA-SPECIFIC METHYLTRANSFERASE 2A and 2B. Genetic disruption of 5mU degradation in the NSH1 mutant causes m5U to occur in mRNA and results in reduced seedling growth, which is aggravated by external 5mU supplementation, also leading to more m5U in all RNA species. Given the similarities between pyrimidine catabolism in plants, mammals and other eukaryotes, we hypothesize that the removal of 5mU is an important function of pyrimidine degradation in many organisms, which in plants serves to protect RNA from stochastic m5U modification.
Collapse
Affiliation(s)
- Shangyu Gao
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yu Sun
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiaoguang Chen
- Department of Molecular Nutrition and Biochemistry of Plants, Institute of Plant Nutrition, Leibniz University Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Changhua Zhu
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiaoye Liu
- Department of Criminal Science and Technology, Nanjing Forest Police College, Nanjing 210023, China
| | - Wenlei Wang
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Lijun Gan
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yanwu Lu
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Frank Schaarschmidt
- Department of Biostatistics, Institute of Cell Biology and Biophysics, Leibniz University Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Marco Herde
- Department of Molecular Nutrition and Biochemistry of Plants, Institute of Plant Nutrition, Leibniz University Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Claus-Peter Witte
- Department of Molecular Nutrition and Biochemistry of Plants, Institute of Plant Nutrition, Leibniz University Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Mingjia Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| |
Collapse
|
3
|
Heydari N, Mahdizadeh M, Jafari SM. The evolving landscape of involvement of DTYMK enzymes in cancer. Med Oncol 2023; 40:213. [PMID: 37358701 DOI: 10.1007/s12032-023-02086-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 06/13/2023] [Indexed: 06/27/2023]
Abstract
Cancer cells require continuous synthesis of nucleotides for their uncontrolled proliferation. Deoxy thymidylate kinase (DTYMK) belongs to the thymidylate kinase family and is concerned with pyrimidine metabolism. DTYMK catalyzes the ATP-based conversion of deoxy-TMP to deoxy-TDP in both de novo and salvage pathways. Different studies demonstrated that DTYMK was increased in various types of cancers such as hepatocellular carcinoma, colon cancer, lung cancer, etc. Increased level of DTYMK was associated with poorer survival and prognosis, stage, grade and size of tumor, cell proliferation, colony formation, enhanced sensitivity to chemotherapy drugs, migration. Some studies were showed that knockdown of DTYMK reduced the signaling pathway of PI3K/AKT and downregulated expression of CART, MAPKAPK2, AKT1 and NRF1. Moreover, some microRNAs could suppress DTYMK expressions. On the other hand based on the TIMER database, the infiltration of macrophages, dendritic cells, neutrophils, B cells, CD4+ T cell and CD8+ T cell is affected by DTYMK. In the present review, we describe the genomic location, protein structure and isoforms of DTYMK and focus on its role in cancer development.
Collapse
Affiliation(s)
- Nadia Heydari
- Metabolic Disorders Research Center, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
- Department of Biochemistry and Biophysics, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
| | - Mahsa Mahdizadeh
- Metabolic Disorders Research Center, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
- Department of Biochemistry and Biophysics, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran
| | - Seyyed Mehdi Jafari
- Metabolic Disorders Research Center, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran.
- Department of Biochemistry and Biophysics, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Islamic Republic of Iran.
| |
Collapse
|
4
|
Harada N, Nagasaki H, Yamamoto H, Matsubara K, Suzuki T, Gomori A, Yokogawa T, Matsuo K, Miyadera K. Depletion of plasma thymidine results in growth retardation and mitochondrial myopathy in mice overexpressing human thymidine phosphorylase. J Biol Chem 2023; 299:103002. [PMID: 36773803 PMCID: PMC10020661 DOI: 10.1016/j.jbc.2023.103002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 02/06/2023] [Accepted: 02/07/2023] [Indexed: 02/11/2023] Open
Abstract
Plasma thymidine levels in rodents are higher than in other mammals including humans, possibly due to a different pattern and lower level of thymidine phosphorylase expression. Here, we generated a novel knock-in (KI) mouse line with high systemic expression of human thymidine phosphorylase to investigate this difference in nucleotide metabolism in rodents. The KI mice showed growth retardation around weaning and died by 4 weeks of age with a decrease in plasma thymidine level compared with the litter-control WT mice. These phenotypes were completely or partially rescued by administration of the thymidine phosphorylase inhibitor 5-chloro-6-(2-iminopyrrolidin-1-yl) methyl-2,4(1H,3H)-pyrimidinedione hydrochloride or thymidine, respectively. Interestingly, when thymidine phosphorylase inhibitor administration was discontinued in adult animals, KI mice showed deteriorated grip strength and locomotor activity, decreased bodyweight, and subsequent hind-limb paralysis. Upon histological analyses, we observed axonal degeneration in the spinal cord, muscular atrophy with morphologically abnormal mitochondria in quadriceps, retinal degeneration, and abnormality in the exocrine pancreas. Moreover, we detected mitochondrial DNA depletion in multiple tissues of KI mice. These results indicate that the KI mouse represents a new animal model for mitochondrial diseases and should be applicable for the study of differences in nucleotide metabolism between humans and mice.
Collapse
Affiliation(s)
- Naomoto Harada
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan.
| | - Haruka Nagasaki
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Hiromi Yamamoto
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Kenji Matsubara
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Takamasa Suzuki
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Akira Gomori
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Tatsushi Yokogawa
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Kenichi Matsuo
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| | - Kazutaka Miyadera
- Discovery and Preclinical Research Division, Taiho Pharmaceutical Co Ltd, Tsukuba, Ibaraki, Japan
| |
Collapse
|
5
|
Fan J, Shi S, Qiu Y, Liu M, Shu Q. Analysis of signature genes and association with immune cells infiltration in pediatric septic shock. Front Immunol 2022; 13:1056750. [PMID: 36439140 PMCID: PMC9686439 DOI: 10.3389/fimmu.2022.1056750] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 10/26/2022] [Indexed: 08/02/2023] Open
Abstract
Background Early diagnosis of septic shock in children is critical for prognosis. This study committed to investigate the signature genes and their connection with immune cells in pediatric septic shock. Methods We screened a dataset of children with septic shock from the GEO database and analyzed differentially expressed genes (DEGs). Functional enrichment analysis was performed for these DEGs. Weighted gene co-expression network analysis (WCGNA) was used to screen the key modules. Least absolute shrinkage and selection operator (LASSO) and random forest analysis were finally applied to identify the signature genes. Then gene set enrichment analysis (GSEA) was exerted to explore the signaling pathways related to the hub genes. And the immune cells infiltration was subsequently classified via using CIBERSORT. Results A total of 534 DEGs were screened from GSE26440. The data then was clustered into 17 modules via WGCNA, which MEgrey module was significantly related to pediatric septic shock (cor=-0.62, p<0.0001). LASSO and random forest algorithms were applied to select the signature genes, containing UPP1, S100A9, KIF1B, S100A12, SLC26A8. The receiver operating characteristic curve (ROC) of these signature genes was 0.965, 0.977, 0.984, 0.991 and 0.989, respectively, which were verified in the external dataset from GSE13904. GSEA analysis showed these signature genes involve in positively correlated fructose and mannose metabolism and starch and sucrose metabolism signaling pathway. CIBERSORT suggested these signature genes may participate in immune cells infiltration. Conclusion UPP1, S100A9, KIF1B, S100A12, SLC26A8 emerge remarkable diagnostic performance in pediatric septic shock and involved in immune cells infiltration.
Collapse
Affiliation(s)
- Jiajie Fan
- Department of Cardiac Intensive Care Unit, The Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Shanshan Shi
- Department of Cardiac Intensive Care Unit, The Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Yunxiang Qiu
- Department of Cardiac Intensive Care Unit, The Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Mingnan Liu
- Department of Cardiac Intensive Care Unit, The Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| | - Qiang Shu
- Department of Cardiac Surgery, The Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, China
| |
Collapse
|
6
|
Wang HL, Liu Y, Zhou T, Gao L, Li J, Wu X, Yin YL. Uridine affects amino acid metabolism in sow-piglets model and increases viability of pTr2 cells. Front Nutr 2022; 9:1018349. [DOI: 10.3389/fnut.2022.1018349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 09/22/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundAs an important nucleoside precursor in salvage synthesis pathway of uridine monophosphate, uridine (UR) is the most abundant nucleotide in sow milk. This study aimed to investigate the effects of maternal UR supplementation during second trimester of gestation on reproductive performance and amino acid metabolism of Sows.ResultsResults showed that compared to CON group, the average number of stillborn piglets per litter was significantly reduced (P < 0.05) with higher average piglet weight at birth in UR group (P = 0.083). Besides, dietary UR supplementation significantly increased TP in sow serum, BUN content in cord serum, and TP and ALB in newborn piglet serum (P < 0.05); but decreased AST level in sow serum and BUN level in piglet serum (P < 0.05). Importantly, free amino acids profile in sow serum newborn piglet serum and colostrum was changed by maternal UR supplementation during day 60 of pregnancy, as well as the expression of amino acids transporter (P < 0.05). In addition, from 100 to 2,000 μM UR can increased the viability of pTr2 cells. The UR exhibited higher distribution of G1/M phase of cell cycle at 400 μM compared with 0 μM, and reduced S-phases of cell cycle compared with 0 and 100μM (P < 0.05).ConclusionSupplementation of uridine during day 60 of pregnancy can improve reproductive performance, regulate amino acid metabolism of sows and their offspring, and increase the viability of pTr2 cells.
Collapse
|
7
|
Soundharrajan I, Karnan M, Jung JS, Lee KD, Lee JC, Ramesh T, Kim D, Choi KC. A Transcriptomic Response to Lactiplantibacillus plantarum-KCC48 against High-Fat Diet-Induced Fatty Liver Diseases in Mice. Int J Mol Sci 2022; 23:ijms23126750. [PMID: 35743193 PMCID: PMC9224190 DOI: 10.3390/ijms23126750] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/15/2022] [Accepted: 06/15/2022] [Indexed: 02/05/2023] Open
Abstract
The most prevalent chronic liver disorder in the world is fatty liver disease caused by a high-fat diet. We examined the effects of Lactiplantibacillus plantarum-KCC48 on high-fat diet-induced (HFD) fatty liver disease in mice. We used the transcriptome tool to perform a systematic evaluation of hepatic mRNA transcripts changes in high-fat diet (HFD)-fed animals and high-fat diet with L. plantarum (HFLPD)-fed animals. HFD causes fatty liver diseases in animals, as evidenced by an increase in TG content in liver tissues compared to control animals. Based on transcriptome data, 145 differentially expressed genes (DEGs) were identified in the liver of HFD-fed mice compared to control mice. Moreover, 61 genes were differentially expressed in the liver of mice fed the HFLPD compared to mice fed the HFD. Additionally, 43 common DEGs were identified between HFD and HFLPD. These genes were enriched in metabolic processes, retinol metabolism, the PPAR signaling pathway, fatty acid degradation, arachidonic metabolism, and steroid hormone synthesis. Taking these data into consideration, it can be concluded that L. plantarum-KCC48 treatment significantly regulates the expression of genes involved in hepatosteatosis caused by HFD, which may prevent fatty liver disease.
Collapse
Affiliation(s)
- Ilavenil Soundharrajan
- Grassland and Forage Division, Rural Development Administration, National Institute of Animal Science, Cheonan 31000, Korea; (I.S.); (M.K.); (J.-S.J.)
| | - Muthusamy Karnan
- Grassland and Forage Division, Rural Development Administration, National Institute of Animal Science, Cheonan 31000, Korea; (I.S.); (M.K.); (J.-S.J.)
| | - Jeong-Sung Jung
- Grassland and Forage Division, Rural Development Administration, National Institute of Animal Science, Cheonan 31000, Korea; (I.S.); (M.K.); (J.-S.J.)
| | - Kyung-Dong Lee
- Department of Companion Animals, Dongsin University, Naju 58245, Korea;
| | - Jeong-Chae Lee
- Department of Bioactive Material Sciences and Research Center of Bioactive Materials, Jeonbuk National University, Jeonju 54896, Korea;
| | - Thiyagarajan Ramesh
- Department of Basic Medical Sciences, College of Medicine, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia;
| | - Dahye Kim
- Animal Genomics and Bioinformatics Division, National Institute of Animal Science, Wanju 55365, Korea
- Correspondence: (D.K.); (K.-C.C.); Tel.: +82-41-580-6752 (D.K.); Fax: +82-41-580-6779 (K.-C.C.)
| | - Ki-Choon Choi
- Grassland and Forage Division, Rural Development Administration, National Institute of Animal Science, Cheonan 31000, Korea; (I.S.); (M.K.); (J.-S.J.)
- Correspondence: (D.K.); (K.-C.C.); Tel.: +82-41-580-6752 (D.K.); Fax: +82-41-580-6779 (K.-C.C.)
| |
Collapse
|
8
|
Chen R, Wang Q, Li Z, Wang D, Yang S, Feng Y. Studies on effect of Tongfengxiaofang in HUM model mice using a UPLC-ESI-Q-TOF/MS metabolomic approach. Biomed Chromatogr 2021; 35:e5118. [PMID: 33749891 DOI: 10.1002/bmc.5118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/03/2021] [Accepted: 03/18/2021] [Indexed: 12/14/2022]
Abstract
Hyperuricemia (HUM) is a major risk factor for the development of gout. The traditional Chinese medicine (TCM) complex prescription Tongfengxiaofang (TFXF) is composed of a variety of TCMs. To study the therapeutic effect of TFXF on HUM mice and the mechanisms by which it exerts a therapeutic effect, the biochemical indices were measured and qPCR technique was used. In addition, plasma metabolomics analysis was carried out based on UPLC-Q-TOF/MS to evaluate the characteristics of the metabolic spectrum changes. TFXF significantly downregulated the contents of uric acid, urea nitrogen and creatinine in serum and the concentration of xanthine oxidase in liver of HUM mice. In addition, TFXF significantly inhibited the overexpression of uric acid transporter 1 and glucose transporter 9 and upregulated the expression of organic anion transporter 1 in the kidney. A total of 152 metabolites were identified and 11 key biomarkers were further selected from these pathways to understand the mechanism of TFXF on the arginine biosynthesis, galactose metabolism, pyrimidine metabolism, glycerophospholipid metabolism, tryptophan metabolism and the citrate cycle (TCA cycle). The results of this confirmed the effect of TFXF on HUM and revealed the metabolic activity mechanism.
Collapse
Affiliation(s)
| | - Qi Wang
- State Key Laboratory of Innovative Drug and Efficient Energy-saving Pharmaceutical Equipment, Nanchang, China
| | - Zhifeng Li
- Jiangxi University of TCM, Nanchang, China.,Nanchang Key Laboratory of Active Ingredients of TCM and Natural medicine, Nanchang, China
| | | | - Shilin Yang
- State Key Laboratory of Innovative Drug and Efficient Energy-saving Pharmaceutical Equipment, Nanchang, China
| | - Yulin Feng
- State Key Laboratory of Innovative Drug and Efficient Energy-saving Pharmaceutical Equipment, Nanchang, China
| |
Collapse
|
9
|
Vila-Julià F, Cabrera-Pérez R, Cámara Y, Molina-Berenguer M, Lope-Piedrafita S, Hirano M, Mingozzi F, Torres-Torronteras J, Martí R. Efficacy of adeno-associated virus gene therapy in a MNGIE murine model enhanced by chronic exposure to nucleosides. EBioMedicine 2020; 62:103133. [PMID: 33232869 PMCID: PMC7689515 DOI: 10.1016/j.ebiom.2020.103133] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 11/05/2020] [Accepted: 11/05/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Preclinical studies have shown that gene therapy is a feasible approach to treat mitochondrial neurogastrointestinal encephalomyopathy (MNGIE). However, the genetic murine model of the disease (Tymp/Upp1 double knockout, dKO) has a limited functional phenotype beyond the metabolic imbalances, and so the studies showing efficacy of gene therapy have relied almost exclusively on demonstrating correction of the biochemical phenotype. Chronic oral administration of thymidine (dThd) and deoxyuridine (dUrd) to dKO mice deteriorates the phenotype of the animals, providing a better model to test therapy approaches. METHODS dKO mice were treated with both dThd and dUrd in drinking water from weaning until the end of the study. At 8 - 11 weeks of age, mice were treated with several doses of adeno-associated virus (AAV) serotype 8 vector carrying the human TYMP coding sequence under the control of different liver-specific promoters (TBG, AAT, or HLP). The biochemical profile and functional phenotype were studied over the life of the animals. FINDINGS Nucleoside exposure resulted in 30-fold higher plasma nucleoside levels in dKO mice compared with non-exposed wild type mice. AAV-treatment provided elevated TP activity in liver and lowered systemic nucleoside levels in exposed dKO mice. Exposed dKO mice had enlarged brain ventricles (assessed by magnetic resonance imaging) and motor impairment (rotarod test); both were prevented by AAV treatment. Among all promoters tested, AAT showed the best efficacy. INTERPRETATION Our results show that AAV-mediated gene therapy restores the biochemical homeostasis in the murine model of MNGIE and, for the first time, demonstrate that this treatment improves the functional phenotype. FUNDING This work was funded in part by the Spanish Instituto de Salud Carlos III, and the Generalitat de Catalunya. The disclosed funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Collapse
Affiliation(s)
- Ferran Vila-Julià
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain
| | - Raquel Cabrera-Pérez
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain
| | - Yolanda Cámara
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain
| | - Miguel Molina-Berenguer
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain
| | - Silvia Lope-Piedrafita
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Catalonia, Spain; Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Cerdanyola del Vallès, Catalonia, Spain
| | - Michio Hirano
- Department of Neurology, H. Houston Merritt Neuromuscular Research Center, Columbia University Irving Medical Center, New York, NY, United States
| | | | - Javier Torres-Torronteras
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain.
| | - Ramon Martí
- Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, and Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Barcelona, Catalonia, Spain.
| |
Collapse
|
10
|
Zhang Y, Guo S, Xie C, Fang J. Uridine Metabolism and Its Role in Glucose, Lipid, and Amino Acid Homeostasis. BIOMED RESEARCH INTERNATIONAL 2020; 2020:7091718. [PMID: 32382566 PMCID: PMC7180397 DOI: 10.1155/2020/7091718] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 02/04/2020] [Indexed: 12/11/2022]
Abstract
Pyrimidine nucleoside uridine plays a critical role in maintaining cellular function and energy metabolism. In addition to its role in nucleoside synthesis, uridine and its derivatives contribute to reduction of cytotoxicity and suppression of drug-induced hepatic steatosis. Uridine is mostly present in blood and cerebrospinal fluid, where it contributes to the maintenance of basic cellular functions affected by UPase enzyme activity, feeding habits, and ATP depletion. Uridine metabolism depends on three stages: de novo synthesis, salvage synthesis pathway and catabolism, and homeostasis, which is tightly relating to glucose homeostasis and lipid and amino acid metabolism. This review is devoted to uridine metabolism and its role in glucose, lipid, and amino acid homeostasis.
Collapse
Affiliation(s)
- Yumei Zhang
- College of Bioscience and Biotechnology, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128 Hunan, China
| | - Songge Guo
- College of Bioscience and Biotechnology, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128 Hunan, China
| | - Chunyan Xie
- College of Bioscience and Biotechnology, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128 Hunan, China
| | - Jun Fang
- College of Bioscience and Biotechnology, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128 Hunan, China
| |
Collapse
|
11
|
Jia Z, Zhao C, Wang M, Zhao X, Zhang W, Han T, Xia Q, Han Z, Lin R, Li X. Hepatotoxicity assessment of Rhizoma Paridis in adult zebrafish through proteomes and metabolome. Biomed Pharmacother 2020; 121:109558. [DOI: 10.1016/j.biopha.2019.109558] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 10/08/2019] [Accepted: 10/17/2019] [Indexed: 12/20/2022] Open
|
12
|
Okesli-Armlovich A, Gupta A, Jimenez M, Auld D, Liu Q, Bassik MC, Khosla C. Discovery of small molecule inhibitors of human uridine-cytidine kinase 2 by high-throughput screening. Bioorg Med Chem Lett 2019; 29:2559-2564. [PMID: 31420268 DOI: 10.1016/j.bmcl.2019.08.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 12/11/2022]
Abstract
Clinically relevant inhibitors of dihydroorotate dehydrogenase (DHODH), a rate-limiting enzyme in mammalian de novo pyrimidine synthesis, have strong antiviral and anticancer activity in vitro. However, they are ineffective in vivo due to efficient uridine salvage by infected or rapidly dividing cells. The pyrimidine salvage enzyme uridine-cytidine kinase 2 (UCK2), a ∼29 kDa protein that forms a tetramer in its active state, is necessary for uridine salvage. Notwithstanding the pharmacological potential of this target, no medicinally tractable inhibitors of the human enzyme have been reported to date. We therefore established and miniaturized an in vitro assay for UCK2 activity and undertook a high-throughput screen against a ∼40,000-compound library to generate drug-like leads. The structures, activities, and modes of inhibition of the most promising hits are described. Notably, our screen yielded non-competitive UCK2 inhibitors which were able to suppress nucleoside salvage in cells both in the presence and absence of DHODH inhibitors.
Collapse
Affiliation(s)
- Ayse Okesli-Armlovich
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; Stanford ChEM-H, Stanford, CA 94305, USA
| | - Amita Gupta
- Stanford ChEM-H, Stanford, CA 94305, USA; Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Marta Jimenez
- Facilitated Access to Screening Technologies (FAST) Laboratory, Novartis Institutes for Biomedical Research, Cambridge, MA 02139, USA
| | - Douglas Auld
- Facilitated Access to Screening Technologies (FAST) Laboratory, Novartis Institutes for Biomedical Research, Cambridge, MA 02139, USA
| | - Qi Liu
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; Stanford ChEM-H, Stanford, CA 94305, USA
| | - Michael C Bassik
- Stanford ChEM-H, Stanford, CA 94305, USA; Department of Genetics, Stanford University, Stanford, CA 94305, USA
| | - Chaitan Khosla
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA; Stanford ChEM-H, Stanford, CA 94305, USA; Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
| |
Collapse
|
13
|
Henricks LM, Jacobs BAW, Meulendijks D, Pluim D, van den Broek D, de Vries N, Rosing H, Beijnen JH, Huitema ADR, Guchelaar H, Cats A, Schellens JHM. Food-effect study on uracil and dihydrouracil plasma levels as marker for dihydropyrimidine dehydrogenase activity in human volunteers. Br J Clin Pharmacol 2018; 84:2761-2769. [PMID: 30047584 PMCID: PMC6256055 DOI: 10.1111/bcp.13719] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/05/2018] [Accepted: 07/14/2018] [Indexed: 12/31/2022] Open
Abstract
AIMS This study aimed to determine the effect of food intake on uracil and dihydrouracil plasma levels. These levels are a promising marker for dihydropyrimidine dehydrogenase activity and for individualizing fluoropyrimidine anticancer therapy. METHODS A randomized, cross-over study in 16 healthy volunteers was performed, in which subjects were examined in fasted and fed state on two separate days. In fed condition, a high-fat, high-caloric breakfast was consumed between 8:00 h and 8:30 h. Whole blood for determination of uracil, dihydrouracil and uridine plasma levels was drawn on both test days at predefined time points between 8:00 h and 13:00 h. RESULTS Uracil levels were statistically significantly different between fasting and fed state. At 13:00 h, the mean uracil level in fasting state was 12.6 ± 3.7 ng ml-1 and after a test meal 9.4 ± 2.6 ng ml-1 (P < 0.001). Dihydrouracil levels were influenced by food intake as well (mean dihydrouracil level at 13:00 h in fasting state 147.0 ± 36.4 ng ml-1 and in fed state 85.7 ± 22.1 ng ml-1 , P < 0.001). Uridine plasma levels showed curves with similar patterns as for uracil. CONCLUSIONS It was shown that both uracil and dihydrouracil levels were higher in fasting state than in fed state. This is hypothesized to be an direct effect of uridine plasma levels, which were previously shown to be elevated in fasting state and reduced after intake of food. These findings show that, when assessing plasma uracil and dihydrouracil levels for adaptive fluoropyrimidine dosing in clinical practice, sampling should be done between 8:00 h and 9:00 h after overnight fasting to avoid bias caused by circadian rhythm and food effects.
Collapse
Affiliation(s)
- Linda M. Henricks
- Division of PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Department of Clinical Pharmacology, Division of Medical OncologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Bart A. W. Jacobs
- Department of Pharmacy & PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Didier Meulendijks
- Division of PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Department of Clinical Pharmacology, Division of Medical OncologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Dutch Medicines Evaluation Board (CBG‐MEB)UtrechtThe Netherlands
| | - Dick Pluim
- Division of PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Department of Clinical Pharmacology, Division of Medical OncologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Daan van den Broek
- Department of Clinical ChemistryThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Niels de Vries
- Department of Pharmacy & PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Hilde Rosing
- Department of Pharmacy & PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Jos H. Beijnen
- Department of Pharmacy & PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Utrecht Institute for Pharmaceutical SciencesUtrecht UniversityUtrechtThe Netherlands
| | - Alwin D. R. Huitema
- Department of Pharmacy & PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Department of Clinical PharmacyUniversity Medical Center Utrecht, Utrecht UniversityUtrechtThe Netherlands
| | - Henk‐Jan Guchelaar
- Department of Clinical Pharmacy and ToxicologyLeiden University Medical CenterLeidenThe Netherlands
| | - Annemieke Cats
- Department of Gastrointestinal Oncology, Division of Medical OncologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Jan H. M. Schellens
- Division of PharmacologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Department of Clinical Pharmacology, Division of Medical OncologyThe Netherlands Cancer InstituteAmsterdamThe Netherlands
- Utrecht Institute for Pharmaceutical SciencesUtrecht UniversityUtrechtThe Netherlands
| |
Collapse
|
14
|
Bhasin N, Alleyne D, Gray OA, Kupfer SS. Vitamin D Regulation of the Uridine Phosphorylase 1 Gene and Uridine-Induced DNA Damage in Colon in African Americans and European Americans. Gastroenterology 2018; 155:1192-1204.e9. [PMID: 29964038 PMCID: PMC6866230 DOI: 10.1053/j.gastro.2018.06.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 06/08/2018] [Accepted: 06/25/2018] [Indexed: 12/24/2022]
Abstract
BACKGROUND & AIMS African Americans have the greatest colorectal cancer (CRC) burden in the United States; interethnic differences in protective effects of vitamin D might contribute to disparities. 1α,25(OH)2D3 vitamin D (the active form of vitamin D) induces transcription of the uridine phosphorylase gene (UPP1) in colon tissues of European Americans but to a lesser extent in colon tissues of African Americans. UPP1-knockout mice have increased intestinal concentrations of uridine and Deoxyuridine triphosphate (dUTP), have increased uridine-induced DNA damage, and develop colon tumors. We studied 1α,25(OH)2D3 regulation of UPP1 and uridine-induced DNA damage in the colon and differences in these processes between African and European Americans. METHODS We quantified expression and activity of UPP1 in response to 1α,25(OH)2D3 in young adult mouse colonic cells, human CRC cells (LS174T), and organoids (derived from rectosigmoid biopsy samples of healthy individuals undergoing colonoscopies) using quantitative polymerase chain reaction, immunoblot, and immunocytochemistry assays. Binding of the vitamin D receptor to UPP1 was tested by chromatin immunoprecipitation. Uridine-induced DNA damage was measured by fragment-length analysis in repair enzyme assays. Allele-specific 1α,25(OH)2D3 responses were tested using luciferase assays. RESULTS Vitamin D increased levels of UPP1 mRNA, protein, and enzymatic activity and increased vitamin D receptor binding to the UPP1 promoter in young adult mouse colonic cells, LS174T cells, and organoids. 1α,25(OH)2D3 significantly reduced levels of uridine and uridine-induced DNA damage in these cells, which required UPP1 expression. Organoids derived from colon tissues of African Americans expressed lower levels of UPP1 after exposure to 1α,25(OH)2D3 and had increased uridine-induced DNA damage compared with organoids derived from tissues of European Americans. Luciferase assays with the T allele of single nucleotide polymorphism rs28605337 near UPP1, which is found more frequently in African Americans than European Americans, expressed lower levels of UPP1 after exposure to 1α,25(OH)2D3 than assays without this variant. CONCLUSIONS We found vitamin D to increase expression of UPP1, leading to reduce uridine-induced DNA damage, in colon cells and organoids. A polymorphism in UPP1 found more frequently in African Americans than European Americans reduced UPP1 expression upon cell exposure to 1α,25(OH)2D3. Differences in expression of UPP1 in response to vitamin D could contribute to the increased risk of CRC in African Americans.
Collapse
Affiliation(s)
- Nobel Bhasin
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago, Chicago, Illinois
| | - Dereck Alleyne
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago, Chicago, Illinois
| | - Olivia A. Gray
- Department of Human Genetics, University of Chicago, Chicago, Illinois
| | - Sonia S. Kupfer
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago, Chicago, Illinois
| |
Collapse
|
15
|
Torell F, Bennett K, Cereghini S, Fabre M, Rännar S, Lundstedt-Enkel K, Moritz T, Haumaitre C, Trygg J, Lundstedt T. Metabolic Profiling of Multiorgan Samples: Evaluation of MODY5/RCAD Mutant Mice. J Proteome Res 2018; 17:2293-2306. [PMID: 29873499 DOI: 10.1021/acs.jproteome.7b00821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In the present study, we performed a metabolomics analysis to evaluate a MODY5/RCAD mouse mutant line as a potential model for HNF1B-associated diseases. Gas chromatography time-of-flight mass spectrometry (GC-TOF-MS) of gut, kidney, liver, muscle, pancreas, and plasma samples uncovered the tissue specific metabolite distribution. Orthogonal projections to latent structures discriminant analysis (OPLS-DA) was used to identify the differences between MODY5/RCAD and wild-type mice in each of the tissues. The differences included, for example, increased levels of amino acids in the kidneys and reduced levels of fatty acids in the muscles of the MODY5/RCAD mice. Interestingly, campesterol was found in higher concentrations in the MODY5/RCAD mice, with a four-fold and three-fold increase in kidneys and pancreas, respectively. As expected, the MODY5/RCAD mice displayed signs of impaired renal function in addition to disturbed liver lipid metabolism, with increased lipid and fatty acid accumulation in the liver. From a metabolomics perspective, the MODY5/RCAD model was proven to display a metabolic pattern similar to what would be suspected in HNF1B-associated diseases. These findings were in line with the presumed outcome of the mutation based on the different anatomy and function of the tissues as well as the effect of the mutation on development.
Collapse
Affiliation(s)
- Frida Torell
- Computational Life Science Cluster (CLiC), Department of Chemistry , Umeå University , Umeå 90187 , Sweden.,Accelerator Lab (ACL) , Karlsruhe Institute of Technology , Karlsruhe 76344 , Germany
| | | | - Silvia Cereghini
- CNRS, UMR7622, 75005 Paris , France.,UPMC, UMR7622 , Sorbonne Universites , 75005 Paris , France.,Inserm U-1156 Paris , France
| | - Mélanie Fabre
- CNRS, UMR7622, 75005 Paris , France.,UPMC, UMR7622 , Sorbonne Universites , 75005 Paris , France.,Inserm U-1156 Paris , France
| | | | - Katrin Lundstedt-Enkel
- AcureOmics AB, Umeå 90736 , Sweden.,Department of Organismal Biology , Uppsala University , Uppsala 75236 , Sweden
| | - Thomas Moritz
- AcureOmics AB, Umeå 90736 , Sweden.,Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology , Swedish University of Agricultural Sciences , Umeå 901 87 , Sweden
| | - Cécile Haumaitre
- CNRS, UMR7622, 75005 Paris , France.,UPMC, UMR7622 , Sorbonne Universites , 75005 Paris , France.,Inserm U-1156 Paris , France
| | - Johan Trygg
- Computational Life Science Cluster (CLiC), Department of Chemistry , Umeå University , Umeå 90187 , Sweden
| | - Torbjörn Lundstedt
- AcureOmics AB, Umeå 90736 , Sweden.,Department of Organic Pharmaceutical Chemistry , Uppsala University , Uppsala 75123 , Sweden
| |
Collapse
|
16
|
Kanemitsu T, Tsurudome Y, Kusunose N, Oda M, Matsunaga N, Koyanagi S, Ohdo S. Periodic variation in bile acids controls circadian changes in uric acid via regulation of xanthine oxidase by the orphan nuclear receptor PPARα. J Biol Chem 2017; 292:21397-21406. [PMID: 29101234 DOI: 10.1074/jbc.m117.791285] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 11/01/2017] [Indexed: 12/16/2022] Open
Abstract
Xanthine oxidase (XOD), also known as xanthine dehydrogenase, is a rate-limiting enzyme in purine nucleotide degradation, which produces uric acid. Uric acid concentrations in the blood and liver exhibit circadian oscillations in both humans and rodents; however, the underlying mechanisms remain unclear. Here, we demonstrate that XOD expression and enzymatic activity exhibit circadian oscillations in the mouse liver. We found that the orphan nuclear receptor peroxisome proliferator-activated receptor-α (PPARα) transcriptionally activated the mouse XOD gene and that bile acids suppressed XOD transactivation. The synthesis of bile acids is known to be under the control of the circadian clock, and we observed that the time-dependent accumulation of bile acids in hepatic cells interfered with the recruitment of the co-transcriptional activator p300 to PPARα, thereby repressing XOD expression. This time-dependent suppression of PPARα-mediated transactivation by bile acids caused an oscillation in the hepatic expression of XOD, which, in turn, led to circadian alterations in uric acid production. Finally, we also demonstrated that the anti-hyperuricemic effect of the XOD inhibitor febuxostat was enhanced by administering it at the time of day before hepatic XOD activity increased. These results suggest an underlying mechanism for the circadian alterations in uric acid production and also underscore the importance of selecting an appropriate time of day for administering XOD inhibitors.
Collapse
Affiliation(s)
| | | | | | | | - Naoya Matsunaga
- From the Departments of Pharmaceutics and.,Glocal Healthcare Science, Kyushu University, Fukuoka 812-8582, Japan
| | - Satoru Koyanagi
- From the Departments of Pharmaceutics and.,Glocal Healthcare Science, Kyushu University, Fukuoka 812-8582, Japan
| | | |
Collapse
|
17
|
Ye X, Deng H, Su M, Liao Q, Huang D, Liao DF, Xiao ZQ, Cao D. A complex microsatellite at chromosome 7q33 as a new prognostic marker of colorectal cancer. Oncotarget 2017; 8:88760-88769. [PMID: 29179473 PMCID: PMC5687643 DOI: 10.18632/oncotarget.21077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/28/2017] [Indexed: 11/25/2022] Open
Abstract
Disease-specific markers are critical for early diagnosis, targeted therapy and prognostic prediction of diseases. Current study reports a complex microsatellite as a new prognostic marker of sporadic colorectal cancer. This microsatellite located at Chromosome 7q33 is composed of three tetranucleotide tandem repeats, (TTCC)2(TCCC)5(TCCT)7, flanked by a CT-rich sequence. We analyzed polymorphisms of this microsatellite in 158 sporadic colorectal cancer, 143 matched normal adjacent tissues (NAT) and 150 health donors. Our results showed that this complex microsatellite was instable with polymorphic frequency of 77.2% in colorectal cancer, 52.4% in NAT and 54.7% in health donors (p<0.01) when compared to reference sequence. In the three tandem repeats, (TCCT)7 site was most polymorphic accounting for over 70.0% of polymorphisms in this complex microsatellite, followed by (TTCC)2 site for approximately 20%. Polymorphisms in (TCCC)5 was rare. Polymorphisms at the (TCCT)7 site were mainly insertions of 1 to 4 copies of TCCT (88.6%), and deletions occurred in about 6.4% of cases. The (TTCC)2 site was featured with one copy TTCC insertions. Pair-wise analyses between colorectal tumors and NAT revealed that 88 of 121 (72.7%) tumors displayed expansion, contraction or both in these tetranucleotide tandem repeats when compared to NAT. A cross-analysis with clinicopathological data of 158 colorectal cancers revealed that polymorphic alterations of the microsatellite associated with less lymphatic metastasis (p<0.001), and the colorectal cancer patients with polymorphic changes in this microsatellite demonstrated better survival (n=112, p=0.0058). Together these data suggest that this complex microsatellite is a potential prognostic marker of sporadic colorectal cancer.
Collapse
Affiliation(s)
- Xu Ye
- Research Center of Carcinogenesis and Targeted Therapy, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.,The Higher Educational Key Laboratory For Cancer Proteomics and Translational Medicine of Hunan province, Xiangya Hospital, Central South University, Changsha, Hunan 410005, China.,Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
| | - Hongyu Deng
- Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
| | - Min Su
- Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
| | - Qianjin Liao
- Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
| | - Dan Huang
- Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China
| | - Duan-Fang Liao
- Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China
| | - Zhi-Qiang Xiao
- Research Center of Carcinogenesis and Targeted Therapy, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.,The Higher Educational Key Laboratory For Cancer Proteomics and Translational Medicine of Hunan province, Xiangya Hospital, Central South University, Changsha, Hunan 410005, China
| | - Deliang Cao
- Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China.,Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China
| |
Collapse
|
18
|
Human pyrimidine nucleotide biosynthesis as a target for antiviral chemotherapy. Curr Opin Biotechnol 2017; 48:127-134. [PMID: 28458037 DOI: 10.1016/j.copbio.2017.03.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 03/10/2017] [Indexed: 01/03/2023]
Abstract
The development of broad-spectrum, host-acting antiviral therapies remains an important but elusive goal in anti-infective drug discovery. To replicate efficiently, viruses not only depend on their hosts for an adequate supply of pyrimidine nucleotides, but also up-regulate pyrimidine nucleotide biosynthesis in infected cells. In this review, we outline our understanding of mammalian de novo and salvage metabolic pathways for pyrimidine nucleotide biosynthesis. The available spectrum of experimental and FDA-approved drugs that modulate individual steps in these metabolic pathways is also summarized. The logic of a host-acting combination antiviral therapy comprised of inhibitors of dihydroorotate dehydrogenase and uridine/cytidine kinase is discussed.
Collapse
|
19
|
Urasaki Y, Pizzorno G, Le TT. Chronic Uridine Administration Induces Fatty Liver and Pre-Diabetic Conditions in Mice. PLoS One 2016; 11:e0146994. [PMID: 26789264 PMCID: PMC4720477 DOI: 10.1371/journal.pone.0146994] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/26/2015] [Indexed: 12/12/2022] Open
Abstract
Uridine is a pyrimidine nucleoside that exerts restorative functions in tissues under stress. Short-term co-administration of uridine with multiple unrelated drugs prevents drug-induced liver lipid accumulation. Uridine has the ability to modulate liver metabolism; however, the precise mechanism has not been delineated. In this study, long-term effects of uridine on liver metabolism were examined in both HepG2 cell cultures and C57BL/6J mice. We report that uridine administration was associated with O-GlcNAc modification of FOXO1, increased gluconeogenesis, reduced insulin signaling activity, and reduced expression of a liver-specific fatty acid binding protein FABP1. Long-term uridine feeding induced systemic glucose intolerance and severe liver lipid accumulation in mice. Our findings suggest that the therapeutic potentials of uridine should be designed for short-term acute administration.
Collapse
Affiliation(s)
- Yasuyo Urasaki
- Department of Biomedical Sciences, College of Medicine, Roseman University of Health Sciences, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
| | - Giuseppe Pizzorno
- Desert Research Institute, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
| | - Thuc T. Le
- Department of Biomedical Sciences, College of Medicine, Roseman University of Health Sciences, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
- * E-mail:
| |
Collapse
|
20
|
Cao Z, Ma J, Chen X, Zhou B, Cai C, Huang D, Zhang X, Cao D. Uridine homeostatic disorder leads to DNA damage and tumorigenesis. Cancer Lett 2016; 372:219-25. [PMID: 26801745 DOI: 10.1016/j.canlet.2016.01.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 01/05/2016] [Accepted: 01/06/2016] [Indexed: 10/22/2022]
Abstract
Uridine is a natural nucleoside precursor of uridine monophosphate in organisms and thus is considered to be safe and is used in a wide range of clinical settings. The far-reaching effects of pharmacological uridine have long been neglected. Here, we report that the homeostatic disorder of uridine is carcinogenic. Targeted disruption (-/-) of murine uridine phosphorylase (UPase) disrupted the homeostasis of uridine and increased spontaneous tumorigenesis by more than 3-fold. Multiple tumors (e.g., lymphoma, hepatoma and lung adenoma) occurred simultaneously in some UPase deficient mice, but not in wild-type mice raised under the same conditions. In the tissue from UPase -/- mice, the 2'-deoxyuridine,5'-triphosphate (dUTP) levels and uracil DNA were increased and p53 was activated with an increased phospho-Ser18 p53 level. Exposing cell lines (e.g., MCF-7, RKO, HCT-8 and NCI-H460) to uridine (10 or 30 µM) led to uracil DNA damage and p53 activation, which in turn triggered the DNA damage response. In these cells, phospho-ATM, phospho-CHK2, and phospho-γH2AX were increased by uridine. These data suggest that uridine homeostatic disorder leads to uracil DNA damage and that pharmacological uridine may be carcinogenic.
Collapse
Affiliation(s)
- Zhe Cao
- College of Bioscience and Biotechnology, Hunan Agricultural University, Furong District, Changsha 410128, China; Shenzhen Key Lab of Infection and Immunity, Shenzhen Third People's Hospital, Guangdong Medical College, Shenzhen, China
| | - Jun Ma
- Department of Medical Microbiology, Immunology & Cell Biology, Simmons Cancer Institute, Southern Illinois University School of Medicine, 913 N. Rutledge Street, Springfield, IL 62794, USA
| | - Xinchun Chen
- Shenzhen Key Lab of Infection and Immunity, Shenzhen Third People's Hospital, Guangdong Medical College, Shenzhen, China
| | - Boping Zhou
- Shenzhen Key Lab of Infection and Immunity, Shenzhen Third People's Hospital, Guangdong Medical College, Shenzhen, China
| | - Chuan Cai
- Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (Incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China
| | - Dan Huang
- Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (Incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China
| | - Xuewen Zhang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Furong District, Changsha 410128, China.
| | - Deliang Cao
- College of Bioscience and Biotechnology, Hunan Agricultural University, Furong District, Changsha 410128, China; Department of Medical Microbiology, Immunology & Cell Biology, Simmons Cancer Institute, Southern Illinois University School of Medicine, 913 N. Rutledge Street, Springfield, IL 62794, USA; Division of Stem Cell Regulation and Application, State Key Laboratory of Chinese Medicine Powder and Medicine Innovation in Hunan (Incubation), Hunan University of Chinese Medicine, Changsha, Hunan 410208, China.
| |
Collapse
|
21
|
Cavazzola LR, Carvalhal GF, Deves C, Renck D, Almeida R, Santos DIS. Relative mRNA expression of prostate-derived E-twenty-six factor and E-twenty-six variant 4 transcription factors, and of uridine phosphorylase-1 and thymidine phosphorylase enzymes, in benign and malignant prostatic tissue. Oncol Lett 2015; 9:2886-2894. [PMID: 26137165 DOI: 10.3892/ol.2015.3093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 03/10/2015] [Indexed: 12/25/2022] Open
Abstract
Prostate cancer is the most frequent urological tumor, and the second most common cancer diagnosed in men. Incidence and mortality are variable and appear to depend on behavioral factors and genetic predisposition. The prostate-derived E-twenty-six factor (PDEF) and E-twenty-six variant 4 (ETV4) transcription factors, and the thymidine phosphorylase (TP) and uridine phosphorylase-1 (UP-1) enzymes, are reported to be components of the pathways leading to tumorigenesis and/or metastasis in a number of tumors. The present study aimed to analyze the mRNA expression levels of these proteins in prostatic cancerous and benign tissue, and their association with clinical and pathological variables. Using quantitative reverse transcription polymerase chain reaction, the mRNA expression levels of PDEF, ETV4, TP and UP-1 were studied in 52 tissue samples (31 of benign prostatic hyperplasia and 21 of prostate adenocarcinomas) obtained from patients treated by transurethral resection of the prostate or by radical prostatectomy. Relative expression was assessed using the ∆-CT method. Data was analyzed using Spearman's tests for correlation. P<0.05 was considered to indicate a statistically significant difference. The results revealed that PDEF, ETV4, UP-1 and TP were expressed in 85.7, 90.5, 95.2 and 100% of the prostate cancer samples, and in 90.3, 96.8, 90.3 and 96.8% of the benign samples, respectively. PDEF and ETV4 exhibited a significantly higher relative expression level in the tumor samples compared with their benign counterparts. The relative expression of TP and UP-1 did not differ significantly between benign and cancerous prostate tissues. The relative expression of TP was moderately and significantly correlated with the expression of ETV4 in the benign tissues. The relative expression of UP-1 was significantly lower in T3 compared with T1 and T2 cancers. These findings indicate that PDEF, ETV4, TP and UP-1 are typically expressed in benign and malignant prostatic tissues. Further studies are necessary to define the role of these proteins as therapeutic targets in prostate cancer.
Collapse
Affiliation(s)
- Luciane Rostirola Cavazzola
- Center for Research on Molecular and Functional Biology, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| | - Gustavo Franco Carvalhal
- Department of Urology, School of Medicine, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| | - Candida Deves
- Center for Research on Molecular and Functional Biology, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| | - Daiana Renck
- Center for Research on Molecular and Functional Biology, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| | - Ricardo Almeida
- Department of Urology, School of Medicine, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| | - DIóGENES Santiago Santos
- Center for Research on Molecular and Functional Biology, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 90619-900, Brazil
| |
Collapse
|
22
|
Urasaki Y, Pizzorno G, Le TT. Uridine affects liver protein glycosylation, insulin signaling, and heme biosynthesis. PLoS One 2014; 9:e99728. [PMID: 24918436 PMCID: PMC4053524 DOI: 10.1371/journal.pone.0099728] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 05/18/2014] [Indexed: 12/11/2022] Open
Abstract
Purines and pyrimidines are complementary bases of the genetic code. The roles of purines and their derivatives in cellular signal transduction and energy metabolism are well-known. In contrast, the roles of pyrimidines and their derivatives in cellular function remain poorly understood. In this study, the roles of uridine, a pyrimidine nucleoside, in liver metabolism are examined in mice. We report that short-term uridine administration in C57BL/6J mice increases liver protein glycosylation profiles, reduces phosphorylation level of insulin signaling proteins, and activates the HRI-eIF-2α-ATF4 heme-deficiency stress response pathway. Short-term uridine administration is also associated with reduced liver hemin level and reduced ability for insulin-stimulated blood glucose removal during an insulin tolerance test. Some of the short-term effects of exogenous uridine in C57BL/6J mice are conserved in transgenic UPase1−/− mice with long-term elevation of endogenous uridine level. UPase1−/− mice exhibit activation of the liver HRI-eIF-2α-ATF4 heme-deficiency stress response pathway. UPase1−/− mice also exhibit impaired ability for insulin-stimulated blood glucose removal. However, other short-term effects of exogenous uridine in C57BL/6J mice are not conserved in UPase1−/− mice. UPase1−/− mice exhibit normal phosphorylation level of liver insulin signaling proteins and increased liver hemin concentration compared to untreated control C57BL/6J mice. Contrasting short-term and long-term consequences of uridine on liver metabolism suggest that uridine exerts transient effects and elicits adaptive responses. Taken together, our data support potential roles of pyrimidines and their derivatives in the regulation of liver metabolism.
Collapse
Affiliation(s)
- Yasuyo Urasaki
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
| | - Giuseppe Pizzorno
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
- * E-mail: (GP); (TTL)
| | - Thuc T. Le
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
- * E-mail: (GP); (TTL)
| |
Collapse
|
23
|
Morató L, Bertini E, Verrigni D, Ardissone A, Ruiz M, Ferrer I, Uziel G, Pujol A. Mitochondrial dysfunction in central nervous system white matter disorders. Glia 2014; 62:1878-94. [DOI: 10.1002/glia.22670] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Revised: 03/20/2014] [Accepted: 03/21/2014] [Indexed: 12/26/2022]
Affiliation(s)
- Laia Morató
- Neurometabolic Diseases Laboratory; Bellvitge Biomedical Research Institute (IDIBELL); L'Hospitalet de Llobregat Barcelona Spain
- Center for Biomedical Research on Rare Diseases (CIBERER); ISCIII Spain
| | - Enrico Bertini
- Unit for Neuromuscular and Neurodegenerative Diseases, Laboratory of Molecular Medicine, Bambino Gesù Children's Hospital; IRCCS Rome Italy
| | - Daniela Verrigni
- Unit for Neuromuscular and Neurodegenerative Diseases, Laboratory of Molecular Medicine, Bambino Gesù Children's Hospital; IRCCS Rome Italy
| | - Anna Ardissone
- Department of Child Neurology The Foundation “Carlo Besta” Neurological Institute (IRCCS); Milan Italy
| | - Montse Ruiz
- Neurometabolic Diseases Laboratory; Bellvitge Biomedical Research Institute (IDIBELL); L'Hospitalet de Llobregat Barcelona Spain
- Center for Biomedical Research on Rare Diseases (CIBERER); ISCIII Spain
| | - Isidre Ferrer
- Institute of Neuropathology, University of Barcelona, L'Hospitalet de Llobregat; Barcelona Spain
- Center for Biomedical Research on Neurodegenerative Diseases (CIBERNED); ISCIII Spain
| | - Graziella Uziel
- Department of Child Neurology The Foundation “Carlo Besta” Neurological Institute (IRCCS); Milan Italy
| | - Aurora Pujol
- Neurometabolic Diseases Laboratory; Bellvitge Biomedical Research Institute (IDIBELL); L'Hospitalet de Llobregat Barcelona Spain
- Center for Biomedical Research on Rare Diseases (CIBERER); ISCIII Spain
- Catalan Institution of Research and Advanced Studies (ICREA); Barcelona Spain
| |
Collapse
|
24
|
Le TT, Urasaki Y, Pizzorno G. Uridine prevents tamoxifen-induced liver lipid droplet accumulation. BMC Pharmacol Toxicol 2014; 15:27. [PMID: 24887406 PMCID: PMC4064512 DOI: 10.1186/2050-6511-15-27] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 04/30/2014] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Tamoxifen, an agonist of estrogen receptor, is widely prescribed for the prevention and long-term treatment of breast cancer. A side effect of tamoxifen is fatty liver, which increases the risk for non-alcoholic fatty liver disease. Prevention of tamoxifen-induced fatty liver has the potential to improve the safety of long-term tamoxifen usage. METHODS Uridine, a pyrimidine nucleoside with reported protective effects against drug-induced fatty liver, was co-administered with tamoxifen in C57BL/6J mice. Liver lipid levels were evaluated with lipid visualization using coherent anti-Stokes Raman scatting (CARS) microscopy, biochemical assay measurement of triacylglyceride (TAG), and liquid chromatography coupled with mass spectrometry (LC-MS) measurement of membrane phospholipid. Blood TAG and cholesterol levels were measured. Mitochondrial respiration of primary hepatocytes in the presence of tamoxifen and/or uridine was evaluated by measuring oxygen consumption rate with an extracellular flux analyzer. Liver protein lysine acetylation profiles were evaluated with 1D and 2D Western blots. In addition, the relationship between endogenous uridine levels, fatty liver, and tamoxifen administration was evaluated in transgenic mice UPase1-/-and UPase1-TG. RESULTS Uridine co-administration prevented tamoxifen-induced liver lipid droplet accumulation in mice. The most prominent effect of uridine co-administration with tamoxifen was the stimulation of liver membrane phospholipid biosynthesis. Uridine had no protective effect against tamoxifen-induced impairment to mitochondrial respiration of primary hepatocytes or liver TAG and cholesterol export. Uridine had no effect on tamoxifen-induced changes to liver protein acetylation profile. Transgenic mice UPase1-/-with increased pyrimidine salvage activity were protected against tamoxifen-induced liver lipid droplet accumulation. In contrast, UPase1-TG mice with increased pyrimidine catabolism activity had intrinsic liver lipid droplet accumulation, which was aggravated following tamoxifen administration. CONCLUSION Uridine co-administration was effective at preventing tamoxifen-induced liver lipid droplet accumulation. The ability of uridine to prevent tamoxifen-induced fatty liver appeared to depend on the pyrimidine salvage pathway, which promotes biosynthesis of membrane phospholipid.
Collapse
Affiliation(s)
- Thuc T Le
- Nevada Cancer Institute, One Breakthrough Way, Las Vegas, NV 89135, USA.
| | | | | |
Collapse
|
25
|
Le TT, Urasaki Y, Pizzorno G. Uridine prevents fenofibrate-induced fatty liver. PLoS One 2014; 9:e87179. [PMID: 24475249 PMCID: PMC3901748 DOI: 10.1371/journal.pone.0087179] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 12/23/2013] [Indexed: 12/15/2022] Open
Abstract
Uridine, a pyrimidine nucleoside, can modulate liver lipid metabolism although its specific acting targets have not been identified. Using mice with fenofibrate-induced fatty liver as a model system, the effects of uridine on liver lipid metabolism are examined. At a daily dosage of 400 mg/kg, fenofibrate treatment causes reduction of liver NAD(+)/NADH ratio, induces hyper-acetylation of peroxisomal bifunctional enzyme (ECHD) and acyl-CoA oxidase 1 (ACOX1), and induces excessive accumulation of long chain fatty acids (LCFA) and very long chain fatty acids (VLCFA). Uridine co-administration at a daily dosage of 400 mg/kg raises NAD(+)/NADH ratio, inhibits fenofibrate-induced hyper-acetylation of ECHD, ACOX1, and reduces accumulation of LCFA and VLCFA. Our data indicates a therapeutic potential for uridine co-administration to prevent fenofibrate-induced fatty liver.
Collapse
Affiliation(s)
- Thuc T. Le
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
| | - Yasuyo Urasaki
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
| | - Giuseppe Pizzorno
- Nevada Cancer Institute, Las Vegas, Nevada, United States of America
- Desert Research Institute, Las Vegas, Nevada, United States of America
| |
Collapse
|
26
|
Le TT, Ziemba A, Urasaki Y, Hayes E, Brotman S, Pizzorno G. Disruption of uridine homeostasis links liver pyrimidine metabolism to lipid accumulation. J Lipid Res 2013; 54:1044-57. [PMID: 23355744 DOI: 10.1194/jlr.m034249] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We report in this study an intrinsic link between pyrimidine metabolism and liver lipid accumulation utilizing a uridine phosphorylase 1 transgenic mouse model UPase1-TG. Hepatic microvesicular steatosis is induced by disruption of uridine homeostasis through transgenic overexpression of UPase1, an enzyme of the pyrimidine catabolism and salvage pathway. Microvesicular steatosis is also induced by the inhibition of dihydroorotate dehydrogenase (DHODH), an enzyme of the de novo pyrimidine biosynthesis pathway. Interestingly, uridine supplementation completely suppresses microvesicular steatosis in both scenarios. The effective concentration (EC(50)) for uridine to suppress microvesicular steatosis is approximately 20 µM in primary hepatocytes of UPase1-TG mice. We find that uridine does not have any effect on in vitro DHODH enzymatic activity. On the other hand, uridine supplementation alters the liver NAD(+)/NADH and NADP(+)/NADPH ratios and the acetylation profile of metabolic, oxidation-reduction, and antioxidation enzymes. Protein acetylation is emerging as a key regulatory mechanism for cellular metabolism. Therefore, we propose that uridine suppresses fatty liver by modulating the liver protein acetylation profile. Our findings reveal a novel link between uridine homeostasis, pyrimidine metabolism, and liver lipid metabolism.
Collapse
Affiliation(s)
- Thuc T Le
- Desert Research Institute, Las Vegas, NV 89135, USA.
| | | | | | | | | | | |
Collapse
|
27
|
Fustin JM, Doi M, Yamada H, Komatsu R, Shimba S, Okamura H. Rhythmic nucleotide synthesis in the liver: temporal segregation of metabolites. Cell Rep 2012; 1:341-9. [PMID: 22832226 DOI: 10.1016/j.celrep.2012.03.001] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 02/13/2012] [Accepted: 03/01/2012] [Indexed: 10/28/2022] Open
Abstract
The synthesis of nucleotides in the body is centrally controlled by the liver, via salvage or de novo synthesis. We reveal a pervasive circadian influence on hepatic nucleotide metabolism, from rhythmic gene expression of rate-limiting enzymes to oscillating nucleotide metabolome in wild-type (WT) mice. Genetic disruption of the hepatic clock leads to aberrant expression of these enzymes, together with anomalous nucleotide rhythms, such as constant low levels of ATP with an excess in uric acid, the degradation product of purines. These results clearly demonstrate that the hepatic circadian clock orchestrates nucleotide synthesis and degradation. This circadian metabolome timetable, obtained using state-of-the-art capillary electrophoresis time-of-flight mass spectrometry, will guide further investigations in nucleotide metabolism-related disorders.
Collapse
Affiliation(s)
- Jean-Michel Fustin
- Department of System Biology, Graduate School of Pharmaceutical Sciences, Kyoto University, 46-29 Yoshida-Shimo-Adachi-cho, Kyoto 606-8501, Japan
| | | | | | | | | | | |
Collapse
|
28
|
Cao D, Ziemba A, McCabe J, Yan R, Wan L, Kim B, Gach M, Flynn S, Pizzorno G. Differential expression of uridine phosphorylase in tumors contributes to an improved fluoropyrimidine therapeutic activity. Mol Cancer Ther 2011; 10:2330-9. [PMID: 21954436 DOI: 10.1158/1535-7163.mct-11-0202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abrogation of uridine phosphorylase (UPase) leads to abnormalities in pyrimidine metabolism and host protection against 5-fluorouracil (5-FU) toxicity. We elucidated the effects on the metabolism and antitumor efficacy of 5-FU and capecitabine (N(4)-pentyloxycarbonyl-5'-deoxy-5-fluorocytidine) in our UPase knockout (UPase(-/-)) model. Treatment with 5-FU (85 mg/kg) or capecitabine (1,000 mg/kg) five days a week for four weeks caused severe toxicity and structural damage to the intestines of wild-type (WT) mice, but not in UPase(-/-) animals. Capecitabine treatment resulted in a 70% decrease in blood cell counts of WT animals, with only a marginal effect in UPase(-/-) mice. UPase expressing colon 38 tumors implanted in UPase(-/-) mice revealed an improved therapeutic efficacy when treated with 5-FU and capecitabine because of the higher maximum tolerated dose for fluoropyrimidines achievable in UPase(-/-) mice. (19)F-MRS evaluation of capecitabine metabolism in tumors revealed similar activation of the prodrug in UPase(-/-) mice compared with WT. In WT mice, approximately 60% of capecitabine was transformed over three hours into its active metabolites, whereas 80% was transformed in tumors implanted in UPase(-/-) mice. In UPase(-/-) mice, prolonged retention of 5'dFUR allowed a proportional increase in tumor tissue. The similar presence of fluorinated catabolic species confirms that dihydropyrimidine dehydrogenase activity was not altered in UPase(-/-) mice. Overall, these results indicate the importance of UPase in the activation of fluoropyrimidines, the effect of uridine in protecting normal tissues, and the role for tumor-specific modulation of the phosphorolytic activity in 5-FU or capecitabine-based chemotherapy.
Collapse
Affiliation(s)
- Deliang Cao
- Department of Medical Microbiology, Immunology, and Cell Biology, Simmons/Cooper Cancer Institute, Southern Illinois University School of Medicine, Springfield, Illinois, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Silva RG, Schramm VL. Uridine phosphorylase from Trypanosoma cruzi: kinetic and chemical mechanisms. Biochemistry 2011; 50:9158-66. [PMID: 21932786 DOI: 10.1021/bi2013382] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reversible phosphorolysis of uridine to generate uracil and ribose 1-phosphate is catalyzed by uridine phosphorylase and is involved in the pyrimidine salvage pathway. We define the reaction mechanism of uridine phosphorylase from Trypanosoma cruzi by steady-state and pre-steady-state kinetics, pH-rate profiles, kinetic isotope effects from uridine, and solvent deuterium isotope effects. Initial rate and product inhibition patterns suggest a steady-state random kinetic mechanism. Pre-steady-state kinetics indicated no rate-limiting step after formation of the enzyme-products ternary complex, as no burst in product formation is observed. The limiting single-turnover rate constant equals the steady-state turnover number; thus, chemistry is partially or fully rate limiting. Kinetic isotope effects with [1'-(3)H]-, [1'-(14)C]-, and [5'-(14)C,1,3-(15)N(2)]uridine gave experimental values of (α-T)(V/K)(uridine) = 1.063, (14)(V/K)(uridine) = 1.069, and (15,β-15)(V/K)(uridine) = 1.018, in agreement with an A(N)D(N) (S(N)2) mechanism where chemistry contributes significantly to the overall rate-limiting step of the reaction. Density functional theory modeling of the reaction in gas phase supports an A(N)D(N) mechanism. Solvent deuterium kinetic isotope effects were unity, indicating that no kinetically significant proton transfer step is involved at the transition state. In this N-ribosyl transferase, proton transfer to neutralize the leaving group is not part of transition state formation, consistent with an enzyme-stabilized anionic uracil as the leaving group. Kinetic analysis as a function of pH indicates one protonated group essential for catalysis and for substrate binding.
Collapse
Affiliation(s)
- Rafael G Silva
- Department of Biochemistry, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, United States
| | | |
Collapse
|
30
|
Roosild TP, Castronovo S, Villoso A, Ziemba A, Pizzorno G. A novel structural mechanism for redox regulation of uridine phosphorylase 2 activity. J Struct Biol 2011; 176:229-37. [PMID: 21855639 DOI: 10.1016/j.jsb.2011.08.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 08/02/2011] [Accepted: 08/02/2011] [Indexed: 01/16/2023]
Abstract
Uridine phosphorylase (UPP) catalyzes the reversible conversion of uridine to uracil and ribose-1-phosphate and plays an important pharmacological role in activating fluoropyrimidine nucleoside chemotherapeutic agents such as 5-fluorouracil and capecitabine. Most vertebrate animals, including humans, possess two homologs of this enzyme (UPP1 & UPP2), of which UPP1 has been more thoroughly studied and is better characterized. Here, we report two crystallographic structures of human UPP2 (hUPP2) in distinctly active and inactive conformations. These structures reveal that a conditional intramolecular disulfide bridge can form within the protein that dislocates a critical phosphate-coordinating arginine residue (R100) away from the active site, disabling the enzyme. In vitro activity measurements on both recombinant hUPP2 and native mouse UPP2 confirm the redox sensitivity of this enzyme, in contrast to UPP1. Sequence analysis shows that this feature is conserved among UPP2 homologs and lacking in all UPP1 proteins due to the absence of a necessary cysteine residue. The state of the disulfide bridge has further structural consequences for one face of the enzyme that suggest UPP2 may have additional functions in sensing and initiating cellular responses to oxidative stress. The molecular details surrounding these dynamic aspects of hUPP2 structure and regulation provide new insights as to how novel inhibitors of this protein may be developed with improved specificity and affinity. As uridine is emerging as a promising protective compound in neuro-degenerative diseases, including Alzheimer's and Parkinson's, understanding the regulatory mechanisms underlying UPP control of uridine concentration is key to improving clinical outcomes in these illnesses.
Collapse
Affiliation(s)
- Tarmo P Roosild
- Department of Drug Development, Nevada Cancer Institute, One Breakthrough Way, Las Vegas, NV 89135, USA.
| | | | | | | | | |
Collapse
|
31
|
Burian K, Endresz V, Deak J, Kormanyos Z, Pal A, Nelson D, Virok DP. Transcriptome analysis indicates an enhanced activation of adaptive and innate immunity by chlamydia-infected murine epithelial cells treated with interferon γ. J Infect Dis 2010; 202:1405-14. [PMID: 20868270 DOI: 10.1086/656526] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Interferon γ (IFN‐γ) is the major cytokine involved in the elimination of Chlamydia infection. Despite its importance, the combined effect of Chlamydia infection and IFN‐γ on the gene expression of murine epithelial cells has only partially been described. METHODS The DNA chip method was used to evaluate the impact of IFN‐γ and both the human strain Chlamydia trachomatis L2 infection and the murine strain Chlamydia muridarum infection on the transcriptome of murine epithelial cells. RESULTS The gene expression analysis revealed that IFN‐γ had an enhancing effect on both the up‐regulation and down‐regulation of the epithelial gene expression. The influenced gene functional classes included cytokine and chemokine expression, antigen presentation, apoptosis, and genes involved in basic metabolic processes such as fatty acid oxidation. We also detected the up‐regulation of various genes that could be directly antichlamydial, such as members of the p47 GTPase family, inducible nitric oxide synthase, and monokine induced by IFN‐γ (MIG). As a functional validation of DNA chip data, we measured the antichlamydial effect of MIG on the extracellular form of Chlamydia. CONCLUSIONS Our results show that IFN‐γ is a key cytokine that primes epithelial cells to activate adaptive and innate immunity and to express antichlamydial effector genes both intracellularly and extracellularly.
Collapse
Affiliation(s)
- Katalin Burian
- Department of Medical Microbiology and Immunobiology, University of Szeged, Szeged, Hungary
| | | | | | | | | | | | | |
Collapse
|
32
|
Renck D, Ducati RG, Palma MS, Santos DS, Basso LA. The kinetic mechanism of human uridine phosphorylase 1: Towards the development of enzyme inhibitors for cancer chemotherapy. Arch Biochem Biophys 2010; 497:35-42. [PMID: 20226755 DOI: 10.1016/j.abb.2010.03.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Revised: 03/05/2010] [Accepted: 03/05/2010] [Indexed: 12/22/2022]
Abstract
Uridine phosphorylase (UP) is a key enzyme in the pyrimidine salvage pathway, catalyzing the reversible phosphorolysis of uridine to uracil and ribose-1-phosphate (R1P). The human UP type 1 (hUP1) is a molecular target for the design of inhibitors intended to boost endogenous uridine levels to rescue normal tissues from the toxicity of fluoropyrimidine nucleoside chemotherapeutic agents, such as capecitabine and 5-fluorouracil. Here, we describe a method to obtain homogeneous recombinant hUP1, and present initial velocity, product inhibition, and equilibrium binding data. These results suggest that hUP1 catalyzes uridine phosphorolysis by a steady-state ordered bi bi kinetic mechanism, in which inorganic phosphate binds first followed by the binding of uridine, and uracil dissociates first, followed by R1P release. Fluorescence titration at equilibrium showed cooperative binding of either P(i) or R1P binding to hUP1. Amino acid residues involved in either catalysis or substrate binding were proposed based on pH-rate profiles.
Collapse
Affiliation(s)
- Daiana Renck
- Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), 90619-900 Porto Alegre, RS, Brazil
| | | | | | | | | |
Collapse
|
33
|
Kong X, Fan H, Liu X, Wang R, Liang J, Gupta N, Chen Y, Fang F, Chang Y. Peroxisome proliferator-activated receptor gamma coactivator-1alpha enhances antiproliferative activity of 5'-deoxy-5-fluorouridine in cancer cells through induction of uridine phosphorylase. Mol Pharmacol 2009; 76:854-60. [PMID: 19602572 DOI: 10.1124/mol.109.056424] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Peroxisome proliferator-activated receptor gamma coactivator-1alpha (PGC-1alpha) is capable of coactivating several nuclear receptors and transcription factors that participate in the regulation of multiple metabolic processes, including gluconeogenesis, mitochondrial biogenesis, and adaptive thermogenesis. Uridine phosphorylase (UPase) catalyzes the reversible conversion of uridine into uracil and contributes to the antineoplastic activity of 5'-deoxy-5-fluorouridine (5'-DFUR) and homeostasis of uridine levels in plasma and tissues. This study demonstrates uridine phosphorylase as a novel target gene of PGC-1alpha, which induces the transcription and enzymatic activity of UPase in various cancer cells and thus augments their susceptibility to 5'-DFUR. PGC-1alpha-induced activation of UPase expression occurs at its transcription level that is mediated by an estrogen-related receptor (ERR) binding site (-1078 to -1070 base pairs) mapped in the promoter region of UPase gene. Our mutational studies using luciferase reporter construct together with electrophoretic mobility shift assays confirm the binding of ERR to PGC-1alpha-responsive element. Moreover, the inhibition of PGC-1alpha/ERRalpha-dependent signaling by 3-[4-(2,4-bis-trifluoromethylbenzyloxy)-3-methoxyphenyl]-2-cyano-N-(5-trifluoromethyl-1,3,4-thiadiazol-2-yl)acrylamide (XCT790) compromises the ability of PGC-1alpha to induce the transcript of UPase, indicating PGC-1alpha-dependent and ERRalpha-mediated up-regulation of UPase. Finally, the overexpression of PGC-1alpha sensitizes breast and colon cancer cells to growth inhibition by 5'-DFUR presumably by inducing apoptosis in tumor cells and XCT790 can inhibit the process. Taken together, our results corroborate the regulatory function of PGC-1alpha in uridine homeostasis and imply its links with the energy metabolism. The mechanistic elucidation of this association between both cellular pathways should advance the clinical use of 5-fluorouracil-based chemotherapy.
Collapse
Affiliation(s)
- Xingxing Kong
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Kim S, Park DH, Kim TH, Hwang M, Shim J. Functional analysis of pyrimidine biosynthesis enzymes using the anticancer drug 5-fluorouracil in Caenorhabditis elegans. FEBS J 2009; 276:4715-26. [PMID: 19645718 DOI: 10.1111/j.1742-4658.2009.07168.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pyrimidine biosynthesis enzymes function in many cellular processes and are closely associated with pyrimidine antagonists used in cancer chemotherapy. These enzymes are well characterized from bacteria to mammals, but not in a simple metazoan. To study the pyrimidine biosynthesis pathway in Caenorhabditis elegans, we screened for mutants exhibiting resistance to the anticancer drug 5-fluorouracil (5-FU). In several strains, mutations were identified in ZK783.2, the worm homolog of human uridine phosphorylase (UP). UP is a member of the pyrimidine biosynthesis family of enzymes and is a key regulator of uridine homeostasis. C. elegans UP homologous protein (UPP-1) exhibited both uridine and thymidine phosphorylase activity in vitro. Knockdown of other pyrimidine biosynthesis enzyme homologs, such as uridine monophosphate kinase and uridine monophosphate synthetase, also resulted in 5-FU resistance. Uridine monophosphate kinase and uridine monophosphate synthetase proteins are redundant, and show different, tissue-specific expression patterns in C. elegans. Whereas pyrimidine biosynthesis pathways are highly conserved between worms and humans, no human thymidine phosphorylase homolog has been identified in C. elegans. UPP-1 functions as a key regulator of the pyrimidine salvage pathway in C. elegans, as mutation of upp-1 results in strong 5-FU resistance.
Collapse
Affiliation(s)
- Seongseop Kim
- Cancer Experimental Resources Branch, National Cancer Center, Gyeonggi-do, Korea
| | | | | | | | | |
Collapse
|
35
|
Liu Z, Zhong L, Krishack PA, Robbins S, Cao JX, Zhao Y, Chung S, Cao D. Structure and promoter characterization of aldo-keto reductase family 1 B10 gene. Gene 2009; 437:39-44. [PMID: 19236911 DOI: 10.1016/j.gene.2009.02.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Revised: 01/28/2009] [Accepted: 02/09/2009] [Indexed: 12/22/2022]
Abstract
Aldo-keto reductase family 1 member B10 (AKR1B10) is overexpressed in human hepatocellular carcinoma, lung squamous carcinoma, and lung adenocarcinoma in smokers. Our recent studies have showed that AKR1B10 plays a critical role in the growth and proliferation of cancer cells by detoxifying reactive carbonyls and regulating fatty acid biosynthesis. However, little is known about the regulatory mechanisms of AKR1B10 expression. In this study, we determined the structure of AKR1B10 gene and characterized its promoter. The results demonstrated that AKR1B10 consists of 10 exons and 9 introns, stretching approximately 13.8 kb. A 5'-RACE study determined the transcriptional start site of AKR1B10 at 320 bp upstream of the ATG translational start codon. A TATA-like (TAATAA) and a CAAT box are present from -145 to -140 bp and -193 to -190 bp upstream of the transcriptional start site, respectively. Motif analysis recognized multiple putative oncogenic and tumor suppressor protein binding sites in the AKR1B10 promoter, including c-Ets-1, C/EBP, AP-1, and p53, but osmolytic response elements were not found. A -4091 bp of the 5'-flanking fragment of the AKR1B10 gene was capable of driving GFP and luciferase reporter gene expression in HepG2 cells derived from human hepatocellular carcinoma; progressive 5'-deletions revealed that a -255 bp fragment possesses full promoter activity.
Collapse
Affiliation(s)
- Ziwen Liu
- Department of Medical Microbiology, Immunology, and Cell Biology, SimmonsCooper Cancer Institute, Southern Illinois University School of Medicine, 913 N. Rutledge Street, Springfield, IL 62702, USA
| | | | | | | | | | | | | | | |
Collapse
|
36
|
López LC, Akman HO, García-Cazorla A, Dorado B, Martí R, Nishino I, Tadesse S, Pizzorno G, Shungu D, Bonilla E, Tanji K, Hirano M. Unbalanced deoxynucleotide pools cause mitochondrial DNA instability in thymidine phosphorylase-deficient mice. Hum Mol Genet 2008; 18:714-22. [PMID: 19028666 DOI: 10.1093/hmg/ddn401] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Replication and repair of DNA require equilibrated pools of deoxynucleoside triphosphate precursors. This concept has been proven by in vitro studies over many years, but in vivo models are required to demonstrate its relevance to multicellular organisms and to human diseases. Accordingly, we have generated thymidine phosphorylase (TP) and uridine phosphorylase (UP) double knockout (TP(-/-)UP(-/-)) mice, which show severe TP deficiency, increased thymidine and deoxyuridine in tissues and elevated mitochondrial deoxythymidine triphosphate. As consequences of the nucleotide pool imbalances, brains of mutant mice developed partial depletion of mtDNA, deficiencies of respiratory chain complexes and encephalopathy. These findings largely account for the pathogenesis of mitochondrial neurogastrointestinal encephalopathy (MNGIE), the first inherited human disorder of nucleoside metabolism associated with somatic DNA instability.
Collapse
Affiliation(s)
- Luis C López
- Department of Neurology, Columbia University Medical Center, New York, NY 10032, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Redzic ZB, Malatiali SA, Craik JD, Rakic ML, Isakovic AJ. Blood-brain barrier efflux transport of pyrimidine nucleosides and nucleobases in the rat. Neurochem Res 2008; 34:566-73. [PMID: 18751895 DOI: 10.1007/s11064-008-9823-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Accepted: 08/05/2008] [Indexed: 11/25/2022]
Abstract
The brain efflux index (BEI), a measurement of blood-brain barrier (BBB) efflux transport, was estimated at 15 s, 30 s, 1 min, 3 min and 10 min after intracerebral injection of [14C]pyrimidines. An initial steep increase of the BEI values over time was observed for [14]uracil and [14C]thymine, followed by a more moderate increase after 1 min. For the corresponding nucleosides, [14C]uridine and [14C]thymidine, the increase of BEI values over time was less steep and linear between 30 s and 3 min. The apparent BBB efflux clearances for [14C]uridine, [14C]thymidine, [14C]uracil and [14C]thymine were (microl/min/g): 95.2 +/- 12.1, 125.3 +/- 18.4, 290.4 +/- 28 and 358.5 +/- 32.5, respectively, which is at least several folds higher than the predicted BBB influx clearances of uridine, uracil and thymidine. Quick depletion of brain parenchyma from brain microvasculature has revealed that [14C] radioactivity accumulated in brain microvessels after injection of nucleosides [14C]thymidine and [14C]uridine, but that was not observed when nucleobases, [14C]thymine and [14C]uracil, were injected. Reverse transcriptase-PCR revealed that the rat brain and liver (positive control) express dihydropyrimidine dehydrogenase, a key enzyme in pyrimidine nucleobase catabolism. Two bands representing spliced variants have been detected with the relative density of the bands (expressed relative to the density of glyceraldehyde3-phosphate dehydrogenase bands, mean +/- SEM from 3 separate samples) 0.16 +/- 0.06 and 0.04 +/- 0.01 (brain) and 0.49 +/- 0.1 and 0.07 +/- 0.01 (liver). Overall, these results indicate that the net direction of pyrimidine BBB transport is the efflux transport; rapid BBB efflux transport and metabolic breakdown of pyrimidine nucleobases appear to be important for brain homeostasis.
Collapse
Affiliation(s)
- Zoran B Redzic
- Department of Physiology, Faculty of Medicine, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait.
| | | | | | | | | |
Collapse
|
38
|
The Cid1 poly(U) polymerase. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2008; 1779:286-94. [PMID: 18371314 DOI: 10.1016/j.bbagrm.2008.03.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2007] [Revised: 03/14/2008] [Accepted: 03/17/2008] [Indexed: 11/23/2022]
Abstract
The Schizosaccharomyces pombe cytoplasmic protein Cid1 acts as a poly(U) polymerase (PUP). Polyadenylated actin mRNA, a target of this activity, is uridylated upon arrest in S phase and is likely to be one of many such Cid1 targets. This RNA uridylation pathway appears to be conserved, as Cid1 orthologs in Arabidopsis thaliana, Caenorhabditis elegans and humans display PUP activity either in vitro or in Xenopus laevis oocytes. Here, we review the literature on Cid1, other PUPs and uridylation, a conserved and previously under-appreciated mechanism of RNA regulation.
Collapse
|
39
|
Guichard SM, Macpherson JS, Mayer I, Reid E, Muir M, Dodds M, Alexander S, Jodrell DI. Gene expression predicts differential capecitabine metabolism, impacting on both pharmacokinetics and antitumour activity. Eur J Cancer 2008; 44:310-7. [DOI: 10.1016/j.ejca.2007.10.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Revised: 10/12/2007] [Accepted: 10/29/2007] [Indexed: 12/27/2022]
|
40
|
Timofeev VI, Lashkov AA, Gabdoulkhakov AG, Pavlyuk BP, Kachalova GS, Betzel C, Morgunova EY, Zhukhlistova NE, Mikhailov AM. Isolation, crystallization and preliminary crystallographic analysis of Salmonella typhimurium uridine phosphorylase crystallized with 2,2'-anhydrouridine. Acta Crystallogr Sect F Struct Biol Cryst Commun 2007; 63:852-4. [PMID: 17909287 PMCID: PMC2339722 DOI: 10.1107/s1744309107040560] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Accepted: 08/22/2007] [Indexed: 11/10/2022]
Abstract
Uridine phosphorylase (UPh; EC 2.4.2.3) is a member of the pyrimidine nucleoside phosphorylase family of enzymes which catalyzes the phosphorolytic cleavage of the C-N glycoside bond of uridine, with the formation of ribose 1-phosphate and uracil. This enzyme has been shown to be important in the activation and catabolism of fluoropyrimidines. Modulation of its enzymatic activity may affect the therapeutic efficacy of chemotherapeutic agents. The structural investigation of the bacterial uridine phosphorylases, both unliganded and complexed with substrate/product analogues and inhibitors, may help in understanding the catalytic mechanism of the phosphorolytic cleavage of uridine. Salmonella typhimurium uridine phosphorylase has been crystallized with 2,2'-anhydrouridine. X-ray diffraction data were collected to 2.15 A. Preliminary analysis of the diffraction data indicates that the crystal belongs to space group P2(1)2(1)2(1), with unit-cell parameters a = 88.52, b = 123.98, c = 133.52 A. The solvent content is 45.51%, assuming the presence of one hexamer molecule per asymmetric unit.
Collapse
Affiliation(s)
- Vladimir I. Timofeev
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Alexander A. Lashkov
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Azat G. Gabdoulkhakov
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Bogdan Ph. Pavlyuk
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Galina S. Kachalova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya Street 3, 142290 Pushchino, Moscow Region, Russia
| | - Christian Betzel
- Institute fur Biochemie und Lebensmittelchemie, University of Hamburg, c/o DESY, Building 22, Notkestrasse 85, 22604 Hamburg, Germany
| | - Ekaterina Yu. Morgunova
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Nadezhda E. Zhukhlistova
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| | - Al’bert M. Mikhailov
- A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospect 59, 119333 Moscow, Russia
| |
Collapse
|
41
|
Balestri F, Barsotti C, Lutzemberger L, Camici M, Ipata PL. Key role of uridine kinase and uridine phosphorylase in the homeostatic regulation of purine and pyrimidine salvage in brain. Neurochem Int 2007; 51:517-23. [PMID: 17643556 DOI: 10.1016/j.neuint.2007.06.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Revised: 06/12/2007] [Accepted: 06/14/2007] [Indexed: 10/23/2022]
Abstract
Uridine, the major circulating pyrimidine nucleoside, participating in the regulation of a number of physiological processes, is readily uptaken into mammalian cells. The balance between anabolism and catabolism of intracellular uridine is maintained by uridine kinase, catalyzing the first step of UTP and CTP salvage synthesis, and uridine phosphorylase, catalyzing the first step of uridine degradation to beta-alanine in liver. In the present study we report that the two enzymes have an additional role in the homeostatic regulation of purine and pyrimidine metabolism in brain, which relies on the salvage synthesis of nucleotides from preformed nucleosides and nucleobases, rather than on the de novo synthesis from simple precursors. The experiments were performed in rat brain extracts and cultured human astrocytoma cells. The rationale of the reciprocal regulation of purine and pyrimidine salvage synthesis in brain stands (i) on the inhibition exerted by UTP and CTP, the final products of the pyrimidine salvage pathway, on uridine kinase and (ii) on the widely accepted idea that pyrimidine salvage occurs at the nucleoside level (mostly uridine), while purine salvage is a 5-phosphoribosyl-1-pyrophosphate (PRPP)-mediated process, occurring at the nucleobase level. Thus, at relatively low UTP and CTP level, uptaken uridine is mainly anabolized to uridine nucleotides. On the contrary, at relatively high UTP and CTP levels the inhibition of uridine kinase channels uridine towards phosphorolysis. The ribose-1-phosphate is then transformed into PRPP, which is used for purine salvage synthesis.
Collapse
Affiliation(s)
- Francesco Balestri
- Dipartimento di Biologia, Unità di Biochimica, Università di Pisa, Via S. Zeno 51, 56100 Pisa, Italy
| | | | | | | | | |
Collapse
|
42
|
Rissland OS, Mikulasova A, Norbury CJ. Efficient RNA polyuridylation by noncanonical poly(A) polymerases. Mol Cell Biol 2007; 27:3612-24. [PMID: 17353264 PMCID: PMC1899984 DOI: 10.1128/mcb.02209-06] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2006] [Revised: 01/02/2007] [Accepted: 03/05/2007] [Indexed: 11/20/2022] Open
Abstract
Nuclear poly(A) polymerase (PAP) polyadenylates nascent mRNAs, promoting their nuclear export, stability, and translation, while the related cytoplasmic polymerase GLD-2 activates translation of deadenylated mRNAs. Here we characterize the biochemical activity of fission yeast Schizosaccharomyces pombe Cid1, a putative cytoplasmic PAP implicated in cell cycle checkpoint controls. Surprisingly, Cid1 has robust poly(U) polymerase activity in vitro, especially when isolated in native multiprotein complexes. Furthermore, we found that upon S-phase arrest, the 3' ends of actin mRNAs were posttranscriptionally uridylated in a Cid1-dependent manner. Finally, Hs2 (ZCCHC6), a human ortholog of Cid1, shows similar activity. These data suggest that uridylation of mRNA forms the basis of an evolutionarily conserved mechanism of gene regulation.
Collapse
Affiliation(s)
- Olivia S Rissland
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom
| | | | | |
Collapse
|
43
|
Beumer JH, Joseph E, Egorin MJ, Parker RS, D'argenio DZ, Covey JM, Eiseman JL. A mass balance and disposition study of the DNA methyltransferase inhibitor zebularine (NSC 309132) and three of its metabolites in mice. Clin Cancer Res 2006; 12:5826-33. [PMID: 17020990 DOI: 10.1158/1078-0432.ccr-06-1234] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE To elucidate the in vivo metabolic fate of zebularine (NSC 309132), a DNA methyltransferase inhibitor proposed for clinical evaluation in the treatment of cancer. EXPERIMENTAL DESIGN Male, CD(2)F(1) mice were dosed i.v. with 100 mg/kg 2-[(14)C]zebularine. At specified times between 5 and 1,440 minutes, mice were euthanized. Plasma, organs, carcass, urine, and feces were collected and assayed for total radioactivity. Plasma and urine were also analyzed for zebularine and its metabolites with a previously validated high-pressure liquid chromatography assay. A similar experiment was done with 2-[(14)C]uridine, the proposed primary metabolite of zebularine. RESULTS Maximum plasma concentrations were 462, 306, 33.6, 21.7, and 11.5 mumol/L for total radioactivity, zebularine, uridine, uracil (each at 5 minutes), and dihydrouracil (at 15 minutes), respectively. Total radioactivity, zebularine, uridine, uracil, and dihydrouracil were rapidly eliminated from plasma, and after 45 minutes, none of the individual compounds could be quantitated by high-pressure liquid chromatography. Plasma data were consistent with sequential conversion of zebularine to uridine, uracil, and dihydrouracil. 2-Pyrimidinone was not observed. Prolonged retention of radioactivity, at concentrations higher than in plasma, was observed in tissues. Recovery of given radioactivity in urine (30.3% of dose), feces (0.4% of dose), cage wash (7.9% of dose), and tissues and carcass (6.1% of dose) after 24 hours implied that up to 55% of radioactivity was expired as (14)CO(2). Comparison of zebularine and uridine pharmacokinetic data indicated that approximately 40% of the zebularine dose was converted to uridine. CONCLUSIONS Zebularine is extensively and rapidly metabolized into endogenous compounds that are unlikely to have effects at the concentrations observed.
Collapse
Affiliation(s)
- Jan H Beumer
- Molecular Therapeutics/Drug Discovery Program, University of Pittsburgh Cancer Institute, 5117 Centre Avenue, Pittsburgh, PA 15213, USA.
| | | | | | | | | | | | | |
Collapse
|
44
|
Tozzi MG, Camici M, Mascia L, Sgarrella F, Ipata PL. Pentose phosphates in nucleoside interconversion and catabolism. FEBS J 2006; 273:1089-101. [PMID: 16519676 DOI: 10.1111/j.1742-4658.2006.05155.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ribose phosphates are either synthesized through the oxidative branch of the pentose phosphate pathway, or are supplied by nucleoside phosphorylases. The two main pentose phosphates, ribose-5-phosphate and ribose-1-phosphate, are readily interconverted by the action of phosphopentomutase. Ribose-5-phosphate is the direct precursor of 5-phosphoribosyl-1-pyrophosphate, for both de novo and 'salvage' synthesis of nucleotides. Phosphorolysis of deoxyribonucleosides is the main source of deoxyribose phosphates, which are interconvertible, through the action of phosphopentomutase. The pentose moiety of all nucleosides can serve as a carbon and energy source. During the past decade, extensive advances have been made in elucidating the pathways by which the pentose phosphates, arising from nucleoside phosphorolysis, are either recycled, without opening of their furanosidic ring, or catabolized as a carbon and energy source. We review herein the experimental knowledge on the molecular mechanisms by which (a) ribose-1-phosphate, produced by purine nucleoside phosphorylase acting catabolically, is either anabolized for pyrimidine salvage and 5-fluorouracil activation, with uridine phosphorylase acting anabolically, or recycled for nucleoside and base interconversion; (b) the nucleosides can be regarded, both in bacteria and in eukaryotic cells, as carriers of sugars, that are made available though the action of nucleoside phosphorylases. In bacteria, catabolism of nucleosides, when suitable carbon and energy sources are not available, is accomplished by a battery of nucleoside transporters and of inducible catabolic enzymes for purine and pyrimidine nucleosides and for pentose phosphates. In eukaryotic cells, the modulation of pentose phosphate production by nucleoside catabolism seems to be affected by developmental and physiological factors on enzyme levels.
Collapse
Affiliation(s)
- Maria G Tozzi
- Dipartimento di Biologia, Laboratorio di Biochimica, Pisa, Italy
| | | | | | | | | |
Collapse
|
45
|
Invited Lectures : Overviews Purinergic signalling: past, present and future. Purinergic Signal 2006; 2:1-324. [PMID: 18404494 PMCID: PMC2096525 DOI: 10.1007/s11302-006-9006-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2006] [Indexed: 12/11/2022] Open
|
46
|
Wan L, Cao D, Zeng J, Yan R, Pizzorno G. Modulation of uridine phosphorylase gene expression by tumor necrosis factor-alpha enhances the antiproliferative activity of the capecitabine intermediate 5'-deoxy-5-fluorouridine in breast cancer cells. Mol Pharmacol 2006; 69:1389-95. [PMID: 16397116 DOI: 10.1124/mol.105.018515] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Uridine phosphorylase (UPase) has been shown to play an important role in the antineoplastic activity of 5-fluorouracil (5-FU) and in the anabolism of its oral prodrug, capecitabine, through the conversion of 5'-deoxy-5-fluorouridine (5'-DFUR) into 5-FU. In this study, we investigated the effect of tumor necrosis factor-alpha (TNF-alpha) on UPase gene expression and 5'-DFUR antiproliferative activity and elucidated the involved signal transduction pathway. Our data indicate that TNF-alpha significantly induced UPase mRNA expression and its enzymatic activity in EMT6 murine breast cancer cells, leading to an enhanced cytotoxicity of 5'-DFUR. This is further confirmed by an increased incorporation of 5'-DFUR-originated 5-FU nucleotides into nucleic acids. To clarify the mechanism of TNF-alpha-induced UPase expression, we first observed the effect of TNF-alpha on the UPase promoter activity with a series of 5'-deleted promoter-luciferase constructs. Transient transfection analysis showed that the TNF-alpha-inductive pattern in EMT6 cells was consistent with the presence of a nuclear factor-kappaB (NF-kappaB) binding element (-1332/-1312 bp) in the UPase promoter region. Furthermore, electrophoretic mobility shift assays, supershift, and cotransfection assays revealed that the activation of p65 was responsible for UPase induction by TNF-alpha. Finally, the induction of UPase by TNF-alpha could be suppressed by PS-341, a NF-kappaB inhibitor. In summary, TNF-alpha efficiently induces UPase gene expression through a NF-kappaB subunit p65-dependent pathway enhancing cell sensitivity to 5'-DFUR. The elucidation of this regulation mechanism may aid in the clinical use of 5-FU-based chemotherapy.
Collapse
Affiliation(s)
- Laxiang Wan
- Department of Internal Medicine (Oncology), Yale University School of Medicine, 333 Cedar Street, SHM I 220, New Haven, CT 06520, USA
| | | | | | | | | |
Collapse
|