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Soltabayeva A, Kurmanbayeva A, Bekturova A, Oshanova D, Nurbekova Z, Srivastava S, Standing D, Zdunek-Zastocka E, Sagi M. Endogenous ureides are employed as a carbon source in Arabidopsis plants exposed to carbon starvation conditions. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 344:112108. [PMID: 38705480 DOI: 10.1016/j.plantsci.2024.112108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 04/01/2024] [Accepted: 04/23/2024] [Indexed: 05/07/2024]
Abstract
Ureides, the degraded products of purine catabolism in Arabidopsis, have been shown to act as antioxidant and nitrogen sources. Herein we elucidate purine degraded metabolites as a carbon source using the Arabidopsis Atxdh1, Ataln, and Ataah knockout (KO) mutants vis-à-vis wild-type (WT) plants. Plants were grown under short-day conditions on agar plates containing half-strength MS medium with or without 1% sucrose. Notably, the absence of sucrose led to diminished biomass accumulation in both shoot and root tissues of the Atxdh1, Ataln, and Ataah mutants, while no such effect was observed in WT plants. Moreover, the application of sucrose resulted in a reduction of purine degradation metabolite levels, specifically xanthine and allantoin, predominantly within the roots of WT plants. Remarkably, an increase in proteins associated with the purine degradation pathway was observed in WT plants in the presence of sucrose. Lower glyoxylate levels in the roots but not in the shoot of the Atxdh1 mutant in comparison to WT, were observed under sucrose limitation, and improved by sucrose application in root, indicating that purine degradation provided glyoxylate in the root. Furthermore, the deficit of purine-degraded metabolites in the roots of mutants subjected to carbon starvation was partially mitigated through allantoin application. Collectively, these findings signify that under conditions of sucrose limitation and short-day growth, purines are primarily remobilized within the root system to augment the availability of ureides, serving as an additional carbon (as well as nitrogen) source to support plant growth.
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Affiliation(s)
- Aigerim Soltabayeva
- Biology Department, School of Science and Humanities, Nazarbayev University, Astana Z05H0P9, Kazakhstan
| | - Assylay Kurmanbayeva
- Department of Biotechnology and Microbiology, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan
| | - Aizat Bekturova
- The Albert Katz International School for Desert Studies, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Dinara Oshanova
- The Albert Katz International School for Desert Studies, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Zhadyrassyn Nurbekova
- The Albert Katz International School for Desert Studies, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Sudhakar Srivastava
- Jacob Blaustein Center for Scientific Cooperation, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Dominic Standing
- The Albert Katz Department of Dryland Biotechnologies, French Associates Institute for Agriculture and Biotechnology of Dryland, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel
| | - Edyta Zdunek-Zastocka
- Warsaw Univ Life Sci, Inst Biol, Dept Biochem & Microbiol, SGGW, Nowoursynowska 159, Warsaw PL-02776, Poland
| | - Moshe Sagi
- The Albert Katz Department of Dryland Biotechnologies, French Associates Institute for Agriculture and Biotechnology of Dryland, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 8499000, Israel; Katif Research Center for Development of Coastal Deserts, Netivot 87710, Israel.
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Kawakami Y, Mazuka M, Yasuda A, Sato M, Hosaka T, Arai H. Acute effect of fructose, sucrose, and isomaltulose on uric acid metabolism in healthy participants. J Clin Biochem Nutr 2023; 72:61-67. [PMID: 36777082 PMCID: PMC9899922 DOI: 10.3164/jcbn.22-41] [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: 04/07/2022] [Accepted: 07/02/2022] [Indexed: 01/01/2023] Open
Abstract
Fructose is associated with hyperuricemia and gout development. Focusing on fructose and fructose-containing disaccharides, we investigated the effects of three different types of carbohydrates (fructose, sucrose, and isomaltulose) on uric acid metabolism and gene expression profiling in peripheral white blood cells. In a randomized crossover study, ten healthy participants ingested test drinks of fructose, sucrose, and isomaltulose, each containing 25 g of fructose. Plasma glucose, serum and urine uric acid, and xanthine/hypoxanthine concentrations were measured. Microarray analysis in peripheral white blood cells and real-time reverse transcription polymerase chain reaction were examined at 0 and 120 in after the intake of test drinks. Serum uric acid concentrations for group fructose were significantly higher than group sucrose at 30-120 min and were significantly higher than those for group isomaltulose at 30-240 min. Several genes involved in the "nuclear factor-kappa B signaling pathway" were markedly changed in group fructose. No significant differences in the mRNA expression levels of tumor necrosis factor, nuclear factor-kappa B, interleukin-1β, and interleukin-18 were noted. This study indicated that fructose intake (monosaccharide) elevated serum uric acid concentrations compared with disaccharide intake. Differences in the quality of carbohydrates might reduce the rapid increase of postprandial serum uric acid concentrations.
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Affiliation(s)
- Yuka Kawakami
- Laboratory of Clinical Nutrition and Management, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Megumi Mazuka
- Laboratory of Clinical Nutrition and Management, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Arisa Yasuda
- Laboratory of Clinical Nutrition and Management, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Megumi Sato
- Laboratory of Clinical Nutrition and Management, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Toshio Hosaka
- Laboratory of Clinical Nutrition, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Hidekazu Arai
- Laboratory of Clinical Nutrition and Management, Graduate Division of Nutritional and Environmental Sciences, and Graduate School of Integrated Pharmaceutical and Nutritional Sciences, The University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan,To whom correspondence should be addressed. E-mail:
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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.
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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
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Kovalčíková A, Gyurászová M, Gardlík R, Boriš M, Celec P, Tóthová Ľ. The effects of sucrose on urine collection in metabolic cages. Lab Anim 2018; 53:180-189. [PMID: 30045671 DOI: 10.1177/0023677218781674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Representative urine collection that respects the standards of animal welfare is still an issue in experimental nephrology. The commonly used metabolic cages induce stress in rodents. In mice, the volume of collected urine is sometimes insufficient for further analysis. The aim of this experiment was to analyse the effects of time of day, temperature and 2%, 5% or 10% sucrose solutions on diuresis, weight change and liquid intake of adult mice placed in metabolic cages for urine collection. Mice were placed in metabolic cages for 12 h during the day or night at standard ambient (22℃) and thermoneutral (28℃) temperatures. To determine the effect of acclimatisation, mice were placed in metabolic cages for five consecutive days. Diuresis increased with concentrations of sucrose. Body weight reduction was most rapid in the group given tap water and decreased with increasing sucrose concentrations. A drastic drop in body weight was observed in mice placed in metabolic cages for four consecutive days with access to tap water and food, indicating that time spent in metabolic cages should be kept to a minimum, as prolonged confinement in metabolic cages can be harmful to mice. The administration of concentrated sucrose solutions can potentially aid in mouse urine collection by reducing the time spent in metabolic cages. Sucrose supplementation increased the albumin/creatinine ratio. However, without showing estimates of glomerular filtration rate, renal haemodynamics, plasma electrolytes and urinary electrolyte excretions, the results of this study do not provide any conclusion about the effect of sucrose on renal function.
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Affiliation(s)
- Alexandra Kovalčíková
- 1 Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Marianna Gyurászová
- 1 Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Roman Gardlík
- 1 Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia.,2 Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Martin Boriš
- 3 Institute of Electronics and Photonics, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Bratislava, Slovakia
| | - Peter Celec
- 1 Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia.,2 Institute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia.,4 Department of Molecular Biology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
| | - Ľubomíra Tóthová
- 1 Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia.,5 Institute of Physiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia
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Karwur FF, Pujiastuti DR. Review Article: URIC ACID HOMEOSTASIS AND DISTURBANCES. FOLIA MEDICA INDONESIANA 2017. [DOI: 10.20473/fmi.v53i4.7164] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
This review examined the homeostasis of uric acid in human body and analyzed recent studies of the affecting major variables. Normal uric acid concentration in male is 3.5-7.2 mg/dL and in female is 2.6-6 mg/dL. Daily turnover of normal uric acid ranges from 498-1392 mg/day, miscible pool is 767-1650 mg, reabsorption is 8064 mg/day, renal excretion is 262-620 mg/day and intestine 186-313 mg/day. The dynamics of uric acid is influenced by factors of food, drink, age, history of disease, and genetic. High purine dietary consumption increases blood uric acid by 1-2 mg/dL, 213-290 g/day fructose drinks increases 0.52-1.7 mg/dL, 1.5 g/kgBW sucrose increases 0.61 mg/dL, and 10-20 ml/kgBW beer increases 0.50-0.92 mg/dL. The ABCG2 gene plays a role in bringing uric acid out of the body by 114.31-162.73 mg/dL, SLC2A9 of 5.43-20.17 mg/dL, and SLC22A12 of 5.77-6.71 mg/dL. The data described the homeostasis of uric acid and the magnitude of the impact of environmental (consumption of food, beverages, and lifestyle) and genetic factors. Understanding uric acid homeostasis and its disturbances is important in managing diseases as a consequence of hyperuricemia and hypouryscemia
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Wan W, Jiang B, Sun L, Xu L, Xiao P. Metabolomics reveals that vine tea (Ampelopsis grossedentata) prevents high-fat-diet-induced metabolism disorder by improving glucose homeostasis in rats. PLoS One 2017; 12:e0182830. [PMID: 28813453 PMCID: PMC5558946 DOI: 10.1371/journal.pone.0182830] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 07/25/2017] [Indexed: 12/26/2022] Open
Abstract
Background Vine tea (VT), derived from Ampelopsis grossedentata (Hand.-Mazz.) W.T. Wang, is an alternative tea that has been consumed widely in south China for hundreds of years. It has been shown that drinking VT on a daily basis improves hyperlipidemia and hyperglycemia. However, little is known about the preventive functions of VT for metabolic dysregulation and the potential pathological mechanisms involved. This paper elucidates the preventive effects of VT on the dysregulation of lipid and glucose metabolism using rats maintained on a high-fat-diet (HFD) in an attempt to explain the potential mechanisms involved. Methods Sprague Dawley (SD) rats were divided into five groups: a group given normal rat chow and water (control group); a group given an HFD and water (HFD group); a group given an HFD and Pioglitazone (PIO group), 5 mg /kg; and groups given an HFD and one of two doses of VT: 500 mg/L or 2000 mg/L. After 8 weeks, changes in food intake, tea consumption, body weight, serum and hepatic biochemical parameters were determined. Moreover, liver samples were isolated for pathology histology and liquid chromatography-mass spectrometry (LC-MS)-based metabolomic research. Results VT reduced the serum levels of glucose and total cholesterol, decreased glucose area under the curve in the insulin tolerance test and visibly impaired hepatic lipid accumulation. Metabolomics showed that VT treatment modulated the contents of metabolic intermediates linked to glucose metabolism (including gluconeogenesis and glycolysis), the TCA cycle, purine metabolism and amino acid metabolism. Conclusion The current results demonstrate that VT may prevent metabolic impairments induced by the consumption of an HFD. These effects may be caused by improved energy-related metabolism (including gluconeogenesis, glycolysis and TCA cycle), purine metabolism and amino acid metabolism, and reduced lipid levels in the HFD-fed rats.
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Affiliation(s)
- Wenting Wan
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, China
| | - Baoping Jiang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, China
| | - Le Sun
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, China
| | - Lijia Xu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, China
- * E-mail:
| | - Peigen Xiao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Beijing, China
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Kakutani-Hatayama M, Kadoya M, Okazaki H, Kurajoh M, Shoji T, Koyama H, Tsutsumi Z, Moriwaki Y, Namba M, Yamamoto T. Nonpharmacological Management of Gout and Hyperuricemia: Hints for Better Lifestyle. Am J Lifestyle Med 2015; 11:321-329. [PMID: 30202351 DOI: 10.1177/1559827615601973] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 07/06/2015] [Accepted: 07/13/2015] [Indexed: 12/22/2022] Open
Abstract
We reviewed lifestyle factors that influence serum uric acid levels and risk of gout flare, and how to improve their deleterious effects. Since obesity increases uric acid and weight gain increases gout risk, weight reduction by daily exercise and limiting intake of excess calories is recommended. However, strenuous exercise, which causes adenine nucleotide degradation; starvation, which decreases uric acid excretion; and dehydration may raise the level of uric acid in serum and trigger gout. Increased intake of purine-rich foods, such as meat and seafood, raise the level of uric acid in serum and is associated with increased risk of gout, whereas dairy products, especially low-fat types, are associated with a lower risk of gout. Also, heavy alcohol drinking raises the uric acid level and increases the risk of gout through adenine nucleotide degradation and lactate production. Sweet fruits and soft drinks containing fructose should be moderated, since fructose may raise uric acid and increase gout risk through uric acid production and/or decreased excretion. On the other hand, the Mediterranean diet is recommended for gout patients, since it may also help prevent hyperuricemia. Furthermore, coffee and vitamin C supplementation could be considered as preventive measures, as those can lower serum uric acid levels as well as the risk of gout.
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Affiliation(s)
- Miki Kakutani-Hatayama
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Manabu Kadoya
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Hirokazu Okazaki
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Masafumi Kurajoh
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Takuhito Shoji
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Hidenori Koyama
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Zenta Tsutsumi
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Yuji Moriwaki
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Mitsuyoshi Namba
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Tetsuya Yamamoto
- Division of Diabetes, Endocrinology, and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
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Yamamoto T, Koyama H, Kurajoh M, Shoji T, Tsutsumi Z, Moriwaki Y. Biochemistry of uridine in plasma. Clin Chim Acta 2011; 412:1712-24. [PMID: 21689643 DOI: 10.1016/j.cca.2011.06.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 06/04/2011] [Accepted: 06/06/2011] [Indexed: 11/18/2022]
Abstract
Uridine is a pyrimidine nucleoside that plays a crucial role in synthesis of RNA, glycogen, and biomembrane. In humans, uridine is present in plasma in considerably higher quantities than other purine and pyrimidine nucleosides, thus it may be utilized for endogenous pyrimidine synthesis. Uridine has a number of biological effects on a variety of organs with or without disease, such as the reproductive organs, central and peripheral nervous systems, and liver. In addition, it is used in clinical situations as a rescue agent to protect against the adverse effects of 5-fluorouracil. Since the biological actions of uridine may be related to its plasma concentration, it is important to examine factors that have effects on that concentration. Factors associated with an increase in plasma concentration of uridine include enhanced ATP consumption, enhanced uridine diphosphate (UDP)-glucose consumption via glycogenesis, inhibited uridine uptake by cells via the nucleoside transport pathway, increased intestinal absorption, and increased 5-phosphribosyl-1-pyrophosphate and urea synthesis. In contrast, factors that decrease the plasma concentration of uridine are associated with accelerated uridine uptake by cells via the nucleoside transport pathway and decreased pyrimidine synthesis.
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Affiliation(s)
- Tetsuya Yamamoto
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Japan.
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Yamamoto T, Inokuchi T, Ka T, Yamamoto A, Takahashi S, Tsutsumi Z, Tamada D, Okuda C, Moriwaki Y. Relationship between plasma uridine and insulin resistance in patients with non-insulin-dependent diabetes mellitus. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2010; 29:504-8. [PMID: 20544544 DOI: 10.1080/15257771003740986] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE It has been demonstrated that uridine infusion induces insulin resistance in rats. Furthermore, it was recently reported that plasma uridine is correlated with homeostasis model assessment of insulin resistance (HOMA-R) in hypertensive patients. Therefore, we investigated whether plasma uridine was correlated with HOMA-R in patients with non-insulin-dependent diabetes mellitus (NIDDM). SUBJECTS AND METHODS The subjects were 23 male patients with NIDDM (average age 63 years) and 18 healthy males (average age 60 years). Blood samples were drawn after an overnight fast, plasma uridine was then measured using high-performance liquid chromatography. RESULTS The average plasma uridine concentration in patients with NIDDM was higher than that in healthy subjects (P < 0.05). Furthermore, plasma uridine values were positively correlated with HOMA-R (r = 0.48, P < 0.05), serum insulin (r = 0.46, P < 0.05), and serum C-peptide radioimmunoreactivity (CPR) (r = 0.44, P < 0.05) values, whereas they were not significantly correlated with fasting blood glucose or hemoglobin A1c values. CONCLUSION We found a positive relationship between plasma uridine value and HOMA-R, serum insulin, and CPR, suggesting that plasma uridine is a marker of insulin resistance in patients with NIDDM.
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Affiliation(s)
- Tetsuya Yamamoto
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Japan.
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Ka T, Inokuchi T, Tamada D, Suda M, Tsutsumi Z, Okuda C, Yamamoto A, Takahashi S, Moriwaki Y, Yamamoto T. Relationship between plasma uridine and urinary urea excretion. Metabolism 2010; 59:441-5. [PMID: 19846174 DOI: 10.1016/j.metabol.2009.07.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Accepted: 07/13/2009] [Indexed: 11/28/2022]
Abstract
To investigate whether the concentration of uridine in plasma is related to the urinary excretion of urea, 45 healthy male subjects with normouricemia and normal blood pressure were studied after providing informed consent. Immediately after collection of 24-hour urine, blood samples were drawn after an overnight fast except for water. The contents of ingested foods during the 24-hour urine collection period were described by the subjects and analyzed by a dietician. Simple regression analysis showed that plasma uridine was correlated with the urinary excretions of urea (R = 0.41, P < .01), uric acid (R = 0.36, P < .05), and uridine (R = 0.30, P < .05), as well as uric acid clearance (R = 0.35, P < .05) and purine intake (R = 0.30, P < .05). In contrast, multiple regression analysis showed a positive relationship only between plasma uridine and urinary excretion of urea. These results suggest that an increase in de novo pyrimidine synthesis leads to an increased concentration of uridine in plasma via nitrogen catabolism in healthy subjects with normouricemia and normal blood pressure.
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Affiliation(s)
- Tuneyoshi Ka
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo 663-6801, Japan
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Moriwaki Y, Inokuchi T, Ka T, Yamamoto A, Tsutsumi Z, Takahashi S, Yamamoto T. Effect of acarbose on the increased plasma concentration of uric acid induced by sucrose ingestion. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2008; 27:631-3. [PMID: 18600518 DOI: 10.1080/15257770802138699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Sucrose is converted fructose and glucose, which may increase plasma uric acid concentration (pUA) through increased purine degradation and/or decreased uric acid (UA) excretion. To investigate effects of acarbose, an inhibitor of alpha-glucosidase, on the increased pUA from sucrose administration, we measured pUA and urinary UA excretion in 6 healthy subjects before and after administering sucrose, with and without co-administration of acarbose. Sucrose raised pUA by 10% (p < 0.01). However, excretion and fractional clearance of UA were unchanged. Sucrose and acarbose coadministration also increased pUA, but less than did sucrose alone (sucrose: 4.9 to 5.4 mg/dl; sucrose + acarbose, 4.7 to 4.9 mg/dl, p < 0.05) without changes in urinary excretion and fractional clearance of UA. Acarbose appears to attenuate the rise in pUA by sucrose ingestion by inhibiting sucrose absorption.
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Affiliation(s)
- Y Moriwaki
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan.
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Ohno M, Ka T, Inokuchi T, Moriwaki Y, Yamamoto A, Takahashi S, Tsutsumi Z, Tsuzita J, Yamamoto T, Nishiguchi S. Effects of exercise and grape juice ingestion in combination on plasma concentrations of purine bases and uridine. Clin Chim Acta 2007; 388:167-72. [PMID: 18035056 DOI: 10.1016/j.cca.2007.10.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2007] [Revised: 10/29/2007] [Accepted: 10/29/2007] [Indexed: 10/22/2022]
Abstract
BACKGROUND Since grape juice contains considerable amounts of fructose, which may increase the plasma concentration of urate, the combination of exercise and grape juice may increase the plasma concentration of urate to a greater degree than grape juice or exercise alone. METHODS We performed 3 experiments with 6 healthy male Japanese. The first was exercise alone (exercise alone experiment), the second was grape juice ingestion alone (grape juice alone experiment), and the third was a combination of exercise and grape juice ingestion (combination experiment). RESULTS In the exercise alone experiment, the concentrations of purine bases and uridine in plasma, and lactate in blood, as well as the urinary excretion of oxypurines were increased, whereas the urinary excretion of uric acid and fractional excretion of purine bases were decreased. In the grape juice alone experiment, the concentrations of purine bases and uridine, as well as lactate in blood were increased, whereas the fractional excretion of uric acid was decreased. In the combination experiment, the concentrations of purine bases and uridine in plasma, and lactate in blood, as well as the urinary excretion of oxypurines were increased, whereas the urinary excretion of uric acid and fractional excretion of hypoxanthine, xanthine, and uric acid were decreased. The increase in plasma concentration of urate by the combination of exercise and grape juice was greater than that by each alone, though it was not significantly different from the sum of increases in those 2 experiments. CONCLUSION Increases in adenine nucleotide degradation and lactic acid production caused by both exercise and grape juice ingestion play an important role in the increase in plasma concentration of urate, while those in combination have an additive effect on that concentration.
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Affiliation(s)
- Masao Ohno
- Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
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