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Ma L, Liu J, Deng M, Zhou L, Zhang Q, Xiao X. Metabolomics analysis of serum and urine in type 1 diabetes patients with different time in range derived from continuous glucose monitoring. Diabetol Metab Syndr 2024; 16:21. [PMID: 38238828 PMCID: PMC10797982 DOI: 10.1186/s13098-024-01257-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 01/03/2024] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Time in range (TIR), as an important glycemic variability (GV) index, is clearly associated with disease complications in type 1 diabetes (T1D). Metabolic dysregulation is also involved in the risks of T1D complications. However, the relationship between metabolites and TIR remains poorly understood. We used metabolomics to investigate metabolic profile changes in T1D patients with different TIR. METHODS This study included 85 T1D patients and 81 healthy controls. GV indices, including TIR, were collected from continuous glucose monitoring system. The patients were compared within two subgroups: TIR-L (TIR < 50%, n = 21) and TIR-H (TIR > 70%, n = 14). To screen for differentially abundant metabolites and metabolic pathways, serum and urine samples were obtained for untargeted metabolomics by ultra-performance liquid chromatography‒mass spectrometry. Correlation analysis was conducted with GV metrics and screened biomarkers. RESULTS Metabolites were significantly altered in T1D and subgroups. Compared with healthy controls, T1D patients had higher serum levels of 5-hydroxy-L-tryptophan, 5-methoxyindoleacetate, 4-(2-aminophenyl)-2,4-dioxobutanoate, and 4-pyridoxic acid and higher urine levels of thromboxane B3 but lower urine levels of hypoxanthine. Compared with TIR-H group, The TIR-L subgroup had lower serum levels of 5-hydroxy-L-tryptophan and mevalonolactone and lower urine levels of thromboxane B3 and phenylbutyrylglutamine. Dysregulation of pathways, such as tryptophan, vitamin B6 and purine metabolism, may be involved in the mechanism of diabetic complications related to glycemic homeostasis. Mevalonolactone, hypoxanthine and phenylbutyrylglutamine showed close correlation with TIR. CONCLUSIONS We identified altered metabolic profiles in T1D individuals with different TIR. These findings provide new insights and merit further exploration of the underlying molecular pathways relating to diabetic complications.
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Affiliation(s)
- Liyuan Ma
- Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China
| | - Jieying Liu
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China
- Department of Medical Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China
| | - Mingqun Deng
- Department of Endocrinology, Beijing Hospital, National Center of Gerontology; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Liyuan Zhou
- Department of Endocrinology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China
| | - Qian Zhang
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China
| | - Xinhua Xiao
- Department of Endocrinology, Key Laboratory of Endocrinology, Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China.
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Rajlic S, Treede H, Münzel T, Daiber A, Duerr GD. Early Detection Is the Best Prevention-Characterization of Oxidative Stress in Diabetes Mellitus and Its Consequences on the Cardiovascular System. Cells 2023; 12:cells12040583. [PMID: 36831253 PMCID: PMC9954643 DOI: 10.3390/cells12040583] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/05/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023] Open
Abstract
Previous studies demonstrated an important role of oxidative stress in the pathogenesis of cardiovascular disease (CVD) in diabetic patients due to hyperglycemia. CVD remains the leading cause of premature death in the western world. Therefore, diabetes mellitus-associated oxidative stress and subsequent inflammation should be recognized at the earliest possible stage to start with the appropriate treatment before the onset of the cardiovascular sequelae such as arterial hypertension or coronary artery disease (CAD). The pathophysiology comprises increased reactive oxygen and nitrogen species (RONS) production by enzymatic and non-enzymatic sources, e.g., mitochondria, an uncoupled nitric oxide synthase, xanthine oxidase, and the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (NOX). Considering that RONS originate from different cellular mechanisms in separate cellular compartments, adequate, sensitive, and compartment-specific methods for their quantification are crucial for early detection. In this review, we provide an overview of these methods with important information for early, appropriate, and effective treatment of these patients and their cardiovascular sequelae.
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Affiliation(s)
- Sanela Rajlic
- Department of Cardiothoracic and Vascular Surgery, University of Medicine Mainz, 55131 Mainz, Germany
| | - Hendrik Treede
- Department of Cardiothoracic and Vascular Surgery, University of Medicine Mainz, 55131 Mainz, Germany
| | - Thomas Münzel
- Center for Cardiology, Department of Cardiology, Molecular Cardiology, University Medical Center, 55131 Mainz, Germany
| | - Andreas Daiber
- Center for Cardiology, Department of Cardiology, Molecular Cardiology, University Medical Center, 55131 Mainz, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Rhine-Main, 55131 Mainz, Germany
| | - Georg Daniel Duerr
- Department of Cardiothoracic and Vascular Surgery, University of Medicine Mainz, 55131 Mainz, Germany
- Correspondence: ; Tel.: +49-172-797-6558
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Wang M, Wu J, Jiao H, Oluwabiyi C, Li H, Zhao J, Zhou Y, Wang X, Lin H. Enterocyte synthesizes and secrets uric acid as antioxidant to protect against oxidative stress via the involvement of Nrf pathway. Free Radic Biol Med 2022; 179:95-108. [PMID: 34954337 DOI: 10.1016/j.freeradbiomed.2021.12.307] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/14/2021] [Accepted: 12/20/2021] [Indexed: 12/22/2022]
Abstract
The gut is an important site to excreting uric acid (UA) in addition to the kidney. The gastrointestinal tract is constantly exposed to various potentially harmful substances, triggering intestinal oxidative damage. In the present study, the hypothesis that UA is can be synthesized to function as an antioxidant in the gut is evaluated. The synthesis and secretion of UA by enterocytes were analyzed in the presence of inosine, a precursor of UA, febuxostat (Fx), an inhibitor of xanthine oxidase (XOR), and H2O2. The regulation of Nrf2 pathway on UA secretion and transport were evaluated in the present of agonist (TBHQ) and inhibitor (ML385) of Nrf2. The in vivo result showed that UA and its oxidation product allantoin were presented in gut contents along the gastrointestinal tract and the highest level of UA and allantoin were detected in duodenum and jejunum respectively. The genes in the de novo purine nucleotide synthesis and salvage-catabolism pathways, and UA transporters were expressed in the intestinal tract. In the in vitro cultured enterocytes and everted gut sacs, inosine stimulated UA synthesis and secretion. H2O2 stimulated UA synthesis and secretion and meanwhile induced oxidative damage. UA attenuated H2O2-induced oxidative damage by Nrf2 pathway. UA secretion and transport were reduced by blocking Nrf2 with ML385, while increased by activating Nrf2 with TBHQ. This study provides new insights into the antioxidant effects if UA on intestinal lumen. The result suggests that activation of Nrf2 pathway is involved in the transportation and secretion of UA.
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Affiliation(s)
- Minghui Wang
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Jianmin Wu
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Hongchao Jiao
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Cecilia Oluwabiyi
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Haifang Li
- College of Life Sciences, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Jingpeng Zhao
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Yunlei Zhou
- College of Chemistry and Material Science, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China
| | - Xiaojuan Wang
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China.
| | - Hai Lin
- Department of Animal Science & Technology, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, No. 61, Daizong Street, Taian, Shandong, 271018, PR China.
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Xu L, Song H, Qiu Q, Jiang T, Ge P, Su Z, Ma W, Zhang R, Huang C, Li S, Lin D, Zhang J. Different Expressions of HIF-1α and Metabolism in Brain and Major Visceral Organs of Acute Hypoxic Mice. Int J Mol Sci 2021; 22:6705. [PMID: 34201416 PMCID: PMC8268807 DOI: 10.3390/ijms22136705] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/27/2021] [Accepted: 05/25/2021] [Indexed: 12/18/2022] Open
Abstract
Hypoxia is associated with clinical diseases. Extreme hypoxia leads to multiple organs failure. However, the different effects of hypoxia on brain and visceral organs still need to be clarified, and moreover, characteristics in vulnerable organs suffering from hypoxia remain elusive. In the present study, we first aimed to figure out the hypoxic sensitivity of organs. Adult male mice were exposed to 6% O2 or 8% O2 for 6 h. Control mice were raised under normoxic conditions. In vivo and in vitro imaging of anti-HIF-1α-NMs-cy5.5 nanocomposites showed that the expression level of hypoxia-inducible factor (HIF-1α) was the highest in the liver, followed by kidney and brain. HIF-1α was detected in the hepatocytes of liver, distal convoluted tubules of kidney and neurons of cerebral cortex. The liver, kidney and brain showed distinct metabolic profiles but an identical change in glutamate. Compared with kidney and brain, the liver had more characteristic metabolites and more disturbed metabolic pathways related to glutaminolysis and glycolysis. The level of O-phosphocholine, GTP, NAD and aspartate were upregulated in hypoxic mice brain, which displayed significant positive correlations with the locomotor activity in control mice, but not in hypoxic mice with impaired locomotor activities. Taken together, the liver, kidney and brain are the three main organs of the body that are strongly respond to acute hypoxia, and the liver exhibited the highest hypoxic sensitivity. The metabolic disorders appear to underlie the physiological function changes.
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Affiliation(s)
- Lu Xu
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
| | - Hua Song
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China; (H.S.); (P.G.); (Z.S.)
| | - Qi Qiu
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
| | - Ting Jiang
- Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;
| | - Pingyun Ge
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China; (H.S.); (P.G.); (Z.S.)
| | - Zaiji Su
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China; (H.S.); (P.G.); (Z.S.)
| | - Wenhui Ma
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
| | - Ran Zhang
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
| | - Caihua Huang
- Research and Communication Center of Exercise and Health, Xiamen University of Technology, Xiamen 361024, China;
| | - Shanhua Li
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
| | - Donghai Lin
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China; (H.S.); (P.G.); (Z.S.)
| | - Jiaxing Zhang
- Institute of Brain Diseases and Cognition, Medical College of Xiamen University, Xiamen 361102, China; (L.X.); (Q.Q.); (W.M.); (R.Z.)
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Decreased Superoxide Dismutase Concentrations (SOD) in Plasma and CSF and Increased Circulating Total Antioxidant Capacity (TAC) Are Associated with Unfavorable Neurological Outcome after Aneurysmal Subarachnoid Hemorrhage. J Clin Med 2021; 10:jcm10061188. [PMID: 33809085 PMCID: PMC7999673 DOI: 10.3390/jcm10061188] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/05/2021] [Accepted: 03/06/2021] [Indexed: 12/23/2022] Open
Abstract
Background: Subarachnoid hemorrhage (SAH) is a devastating disease with high morbidity and mortality. Hypoxia-induced changes and hemoglobin accumulation within the subarachnoid space are thought to lead to oxidative stress, early brain injury, and delayed vasospasm. This study aimed to evaluate the antioxidant status and its impact on neurological outcome in patients with aneurysmal SAH. Methods: In this prospective observational study, 29 patients with aneurysmal SAH were included (mean age 54.7 ± 12.4). Blood and cerebrospinal fluid (CSF) samples were collected on days (d) 1, 3, and 7. In addition, 29 patients without intracranial hemorrhage served as controls. The antioxidant system was analyzed by glutathione peroxidase (GSH-Px; U/L) and total and free glutathione-sulfhydryl (GSH; mg/L) in the plasma. Superoxide dismutase (SOD, U/mL) and total antioxidant capacity (TAC, µmol/L) were measured in the serum and CSF. Clinical data were compiled on admission (Hunt and Hess grade, Fisher grade, and GCS). Neurological and cognitive outcome (modified Rankin scale (mRS), Glasgow Outcome Scale Extended (GOSE) and Montreal Cognitive Assessment (MoCA)) was assessed after 6 weeks (6 w) and 6 months (6 m). Results: Plasma levels of SOD increased from day 1 to 7 after SAH (d1: 1.22 ± 0.36 U/L; d3: 1.25 ± 0.33 U/L, p = 0.99; d7: 1.52 ± 0.4 U/L, p = 0.019) and were significantly higher compared to controls (1.11 ± 0.27 U/L) at day 7 (p < 0.001). Concordantly, CSF levels of SOD increased from day 1 to 7 after SAH (d1: 1.22 ± 0.41 U/L; d3: 1.77 ± 0.73 U/L, p = 0.10; d7: 2.37 ± 1.29 U/L, p < 0.0001) without becoming significantly different compared to controls (1.74 ± 0.8 U/L, p = 0.09). Mean plasma TAC at day 1 (d1: 77.87 ± 49.72 µmol/L) was not statistically different compared to controls (46.74 ± 32.42 µmol/L, p = 0.25). TAC remained unchanged from day 1 to 7 (d3: 92.64 ± 68.58 µmol/L, p = 0.86; d7: 74.07 ± 54.95 µmol/L, p = 0.8) in plasma. TAC in CSF steeply declined from day 1 to 7 in patients with SAH becoming significantly different from controls at days 3 and 7 (d3: 177.3 ± 108.7 µmol/L, p = 0.0046; d7: 85.35 ± 103.9 µmol/L, p < 0.0001). Decreased SOD levels in plasma and CSF are associated with a worse neurological outcome 6 weeks (mRS: CSF p = 0.0001; plasma p = 0.027/GOSE: CSF p = 0.001; plasma p = 0.001) and 6 months (mRS: CSF p = 0.001; plasma p = 0.09/GOSE: CSF p = 0.001; plasma p = 0.001) after SAH. Increased plasma TAC correlated with a worse neurological outcome 6 weeks (mRS: p = 0.001/GOSE p = 0.001) and 6 months (mRS p = 0.001/GOSE p = 0.001) after SAH. Conclusion: In our study, a reduction in the antioxidative enzyme SOD and elevated TAC were associated with a poorer neurological outcome reflected by mRS and GOSE at 6 weeks and 6 months after SAH. A lower initial SOD CSF concentration was associated with the late deterioration of cognitive ability. These findings support the mounting evidence of the role of oxidative stress in early brain injury formation and unfavorable outcome after SAH.
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Seedad R, khuthinakhun S, Ratanawimarnwong N, Jittangprasert P, Mantim T, Songsrirote K. Carbon dots prepared from citric acid and urea by microwave-assisted irradiation as a turn-on fluorescent probe for allantoin determination. NEW J CHEM 2021. [DOI: 10.1039/d1nj03284d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon dots from citric acid and urea as a fluorescent probe for sensitive and selective detection of allantoin.
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Affiliation(s)
- Ratchadaporn Seedad
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
| | - Sasimaporn khuthinakhun
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
| | - Nuanlaor Ratanawimarnwong
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
| | - Piyada Jittangprasert
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
| | - Thitirat Mantim
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
| | - Kriangsak Songsrirote
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
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Ethyl Pyruvate Increases Post-Ischemic Levels of Mitochondrial Energy Metabolites: A 13C-Labeled Cerebral Microdialysis Study. Metabolites 2020; 10:metabo10070287. [PMID: 32668656 PMCID: PMC7407637 DOI: 10.3390/metabo10070287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 01/26/2023] Open
Abstract
Mitochondrial dysfunction after transient cerebral ischemia can be monitored by cerebral microdialysis (CMD) using changes in the lactate and pyruvate concentrations and ratio. Other metabolites associated with mitochondrial (dys)function are, e.g., tricyclic acid (TCA) and purine metabolites. Ethyl pyruvate (EP) is a putative neuroprotectant, supposedly targeting mitochondrial energy metabolism, but its effect on cerebral energy metabolism has never been described using microdialysis. In this study we monitored the metabolic effects of EP in the endothelin-1 (ET-1) rat model using perfusion with 13C-succinate and analysis of endogenous and 13C-labeled metabolites in the dialysates by liquid chromatography-mass spectrometry (LC-MS). Adult Sprague Dawley rats (n = 27 of which n = 11 were included in the study) were subjected to the microdialysis experiments. Microdialysis probes were perfused with 13C-labeled succinate (1 mM), and striatal dialysates were collected at 30 min intervals before induction of the insult, during intracerebral application of ET-1, and during intravenous treatment with either EP (40 mg/kg) or placebo, which was administered immediately after the insult. The rats were subjected to transient cerebral ischemia by unilateral microinjection of ET-1 in the piriform cortex, causing vasoconstriction of the medial cerebral artery. Monitoring was continued for 5 h after reperfusion, and levels of endogenous and 13C-labeled energy metabolites before and after ischemia-reperfusion were compared in EP-treated and control groups. Infarct volumes were assessed after 24 h. In both the EP-treated and placebo groups, ET-1-induced vasoconstriction resulted in a transient depression of interstitial glucose and elevation of lactate in the ipsilateral striatum. In the reperfusion phase, the concentrations of labeled malate, isocitrate, and lactate as well as endogenous xanthine were significantly higher in the EP-group than in the placebo-group: (mean ± SEM) labeled malate: 39.5% ± 14.9, p = 0.008; labeled isocitrate: 134.8% ± 67.9, p = 0.047; labeled lactate: 61% ± 22.0, p = 0.007; and endogenous xanthine: 93.9% ± 28.3, p = 0.0009. In the placebo group, significantly elevated levels of uridine were observed (mean ± SEM) 32.5% ± 12.7, p = 0.01. Infarct volumes were not significantly different between EP-treated and placebo groups, p = 0.4679. CMD labeled with 13C-succinate enabled detection of ischemic induction and EP treatment effects in the ET-1 rat model of transient focal cerebral ischemia. EP administered as a single intravenous bolus in the reperfusion-phase after transient cerebral ischemia increased de novo synthesis of several key intermediate energy metabolites (13C-malate, 13C-isocitrate, and endogenous xanthine). In summary, mitochondria process 13C-succinate more effectively after EP treatment.
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Hippocampal Metabolite Profiles in Two Rat Models of Autism: NMR-Based Metabolomics Studies. Mol Neurobiol 2020; 57:3089-3105. [PMID: 32468248 PMCID: PMC7320041 DOI: 10.1007/s12035-020-01935-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 05/13/2020] [Indexed: 12/22/2022]
Abstract
Autism spectrum disorders (ASDs) are increasingly being diagnosed. Hypotheses link ASD to genetic, epigenetic, or environmental factors. The role of oxidative stress and the imbalance between excitatory and inhibitory neurotransmission in the pathogenesis of ASD has been suggested. Rats in which ASD symptoms are induced by valproate (VPA) or thalidomide (THAL) application in utero are useful models in ASD studies. Our study investigated whether rats in ASD models show changes in metabolite levels in the brain consistent with the hypothetical pathomechanisms of ASD. Female rats were fed one dose of 800 mg/kg VPA or 500 mg/kg THAL orally on the 11th day of gestation, and 1-month offspring were used for the experiments. Metabolic profiles from proton nuclear magnetic resonance spectroscopy of hydrophilic and hydrophobic extracts of rat hippocampi were subjected to OPLS-DA statistical analysis. Large differences between both models in the content of several metabolites in the rat hippocampus were noticed. The following metabolic pathways were identified as being disturbed in both ASD models: steroid hormone biosynthesis; fatty acid biosynthesis; the synthesis and degradation of ketone bodies; glycerophospholipid metabolism; cholesterol metabolism; purine metabolism; arginine and proline metabolism; valine, leucine, and isoleucine biosynthesis and degradation. These results indicate disorders of energy metabolism, altered structure of cell membranes, changes in neurotransmission, and the induction of oxidative stress in the hippocampus. Our data, consistent with hypotheses of ASD pathomechanisms, may be useful in future ASD studies, especially for the interpretation of the results of metabolomics analysis of body fluids in rat ASD models.
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Liao Y, Hu R, Wang Z, Peng Q, Dong X, Zhang X, Zou H, Pu Q, Xue B, Wang L. Metabolomics Profiling of Serum and Urine in Three Beef Cattle Breeds Revealed Different Levels of Tolerance to Heat Stress. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:6926-6935. [PMID: 29905066 DOI: 10.1021/acs.jafc.8b01794] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study was to determine differences in the global metabolic profiles of serum and urine of Xuanhan yellow cattle, Simmental crossbred cattle (Simmental × Xuanhan yellow cattle), and cattle-yaks (Jersey × Maiwa yak) under heat stress (temperature-humidity index remained above 80 for 1 week). A total of 55 different metabolites associated with the three breeds were identified in the serum and urine samples by gas chromatography-mass spectrometry. The metabolic adaptations to heat stress are heterogeneous. Cattle-yaks mobilize a greater amount of body protein to release glucogenic amino acids to supply energy, whereas the tricarboxylic acid cycle is inhibited. Simmental crossbred cattle mobilize a greater amount of body fat to use free fatty acids as an energy source. In comparison with Simmental crossbred cattle and cattle-yaks, Xuanhan yellow cattle have higher glycolytic activity and possess a stronger antioxidant defense system and are, in conclusion, more adapted to hot and humid environments.
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Affiliation(s)
- Yupeng Liao
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Rui Hu
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Zhisheng Wang
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Quanhui Peng
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Xianwen Dong
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Xiangfei Zhang
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Huawei Zou
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Qijian Pu
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Bai Xue
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
| | - Lizhi Wang
- Institute of Animal Nutrition, Key Laboratory of Bovine Low-Carbon Farming and Safe Production , Sichuan Agricultural University , Chengdu , Sichuan 611130 , China
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Bo L, Liu Y, Jia S, Liu Y, Zhang M, Li S, Zhao X, Sun C. Metabonomics analysis of quercetin against the nephrotoxicity of acrylamide in rats. Food Funct 2018; 9:5965-5974. [DOI: 10.1039/c8fo00902c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This research aimed at studying the effect of quercetin against the nephrotoxicity of acrylamide by metabonomics analysis of kidney tissue.
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Affiliation(s)
- Lu Bo
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Yanli Liu
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Siqi Jia
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Yajing Liu
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Meiyan Zhang
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Siqi Li
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Xiujuan Zhao
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
| | - Changhao Sun
- Department of Nutrition and Food Hygiene
- Public Health College
- Harbin Medical University
- Harbin
- China
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Hou Y, Wang X, Ping J, Lei Z, Gao Y, Ma Z, Jia C, Zhang Z, Li X, Jin M, Li X, Suo C, Zhang Y, Su J. Metabonomics Approach to Assessing the Modulatory Effects of Kisspeptin-10 on Liver Injury Induced by Heat Stress in Rats. Sci Rep 2017; 7:7020. [PMID: 28765538 PMCID: PMC5539146 DOI: 10.1038/s41598-017-06017-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 06/07/2017] [Indexed: 01/19/2023] Open
Abstract
The protective effects of Kisspeptin on heat-induced oxidative stress in rats were investigated by using a combination of biochemical parameters and metabonomics. Metabonomic analyses were performed using gas chromatography/mass spectrometry in conjunction with multivariate and univariate statistical analyses. At the end point of the heat stress experiment, histological observation, ultrastructural analysis and biochemical parameters were measured. Metabonomic analysis of liver tissue revealed that Kisspeptin mainly attenuated the alteration of purine metabolism and fatty acid metabolism pathways. Futhermore, Kisspeptin also increased the levels of GSH, T-AOC as well as SOD activities, and upregulated MDA levels. These results provide important mechanistic insights into the protective effects of Kisspeptin against heat-induced oxidative stress.
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Affiliation(s)
- Yuanlong Hou
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Xiaoyan Wang
- Ministry of Education Key Laboratory of Systems Biomedicine, Shanghai Center for Systems Biomedicine, and School of Pharmacy, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jihui Ping
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Zhihai Lei
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Yingdong Gao
- Laboratory Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing, 320100, China
| | - Zhiyu Ma
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Cuicui Jia
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Zheng Zhang
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Xiang Li
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Mengmeng Jin
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Xiaoliang Li
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Chuan Suo
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Ying Zhang
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China
| | - Juan Su
- College of Veterinary Medicine, Nanjing Agriculture University, Nanjing, 210095, China.
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Elmas O, Elmas O, Aliciguzel Y, Simsek T. The relationship between hypertension and plasma allantoin, uric acid, xanthine oxidase activity and nitrite, and their predictive capacity in severe preeclampsia. J OBSTET GYNAECOL 2015; 36:34-8. [PMID: 26366935 DOI: 10.3109/01443615.2015.1030608] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
It is controversial that uric acid (UA) levels are related to the severity of hypertension in preeclampsia (PE). Our aim in this study was to determine whether UA, xanthine oxidase activity (XOA), allantoin and nitrite levels are related to arterial blood pressure (BP) in PE. We formed a control group (n = 20) and a PE group (n = 20) for the study. Their BPs and plasma UA, XOA, allantoin and nitrite levels were measured. The values from the control and PE pregnant women were assessed via a Wilcoxon matched-pairs test. A Pearson correlation test was also performed. In addition, the diagnostic value of these tests was evaluated via receiver operating characteristic (ROC) analysis. The BP, UA, XOA and allantoin levels in the PE patients were found to be higher when compared with those of the pregnant controls. The UA, XOA and allantoin levels showed high correlations with BP in cases of PE. However, there was no superiority among the correlations. No differences were observed between the groups in terms of nitrite levels and the relationship between nitrite and BP. UA, XOA and allantoin levels may be high due to placental cell death because of abnormal trophoblastic activity observed in PE. Moreover, the reactive oxygen products that are created during the genetic material degradation may explain how UA, XOA and allantoin levels are related to BP. According to ROC analysis, UA, XOA and allantoin assays are reliable predictors for the determination of PE.
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Affiliation(s)
- Oguz Elmas
- a Biochemistry Laboratory, Korkuteli State Hospital , Antalya , Turkey
| | - Onur Elmas
- b Department of Physiology , Faculty of Medicine, Mugla Sitki Kocman University , Mugla , Turkey
| | - Yakup Aliciguzel
- c Department of Biochemistry , Faculty of Medicine, Akdeniz University , Antalya , Turkey
| | - Tayyup Simsek
- d Department of Obstetrics , Faculty of Medicine, Akdeniz University , Antalya , Turkey
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Esiaba I, Angeles DM, Holden MS, Tan JBC, Asmerom Y, Gollin G, Boskovic DS. Urinary Allantoin Is Elevated in Severe Intraventricular Hemorrhage in the Preterm Newborn. Transl Stroke Res 2015; 7:97-102. [PMID: 25994284 DOI: 10.1007/s12975-015-0405-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 04/06/2015] [Accepted: 05/08/2015] [Indexed: 11/27/2022]
Abstract
Germinal matrix intraventricular hemorrhage (IVH) is the most common type of intracranial hemorrhage observed in preterm neonates. It is a precursor of poor neurocognitive development, cerebral palsy, and death. The pathophysiology is not well defined, but damage to the fragile germinal matrix vasculature may be due to free radicals generated during inflammation and as a consequence of ischemia followed by reperfusion. Assessment of the oxidative stress status in these infants is therefore important. Urinary allantoin concentration was measured in preterm neonates as a marker of oxidative stress associated with IVH. Urine was collected from 44 preterm neonates at four time points between 24 and 72 hours of life (HOL), and the allantoin content was determined by gas chromatography mass spectrometry (GCMS). Records were retrospectively reviewed, and the incidence and severity of IVH was categorized as follows: no IVH (n = 24), mild (grade 1-2) IVH (n = 13), and severe (grade 3-4) IVH (n = 7). Neonates with severe IVH showed significantly elevated allantoin levels vs subjects with no IVH from 36 HOL (0.098 ± 0.013 μmol and 0.043 ± 0.007 μmol, respectively, p = 0.002). The allantoin concentration remained elevated even at 72 HOL (0.079 ± 0.014 μmol and 0.033 ± 0.008 μmol, respectively, p = 0.021). There were no significant differences in allantoin levels in the no IVH and mild IVH groups. IVH was diagnosed by head imaging on average at about 11th postnatal day. Urinary allantoin levels were significantly elevated during the first 3 days of life in the neonates subsequently diagnosed with severe IVH, suggesting that oxidative stress might be a crucial factor in IVH pathogenesis. Further studies are needed to assess the usefulness of urinary allantoin in early identification of preterm infants at risk for or with severe IVH and monitoring of the response to interventions designed to prevent or treat it.
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Affiliation(s)
- Ijeoma Esiaba
- Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - Danilyn M Angeles
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - Megan S Holden
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA.,Division of Biochemistry, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - John B C Tan
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA.,Division of Biochemistry, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - Yayesh Asmerom
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - Gerald Gollin
- Division of Pediatric Surgery, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA
| | - Danilo S Boskovic
- Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA. .,Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA. .,Division of Biochemistry, School of Medicine, Loma Linda University, Loma Linda, CA, 92350, USA.
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Liu J, Wang C, Liu F, Lu Y, Cheng J. Metabonomics revealed xanthine oxidase-induced oxidative stress and inflammation in the pathogenesis of diabetic nephropathy. Anal Bioanal Chem 2015; 407:2569-79. [PMID: 25636229 DOI: 10.1007/s00216-015-8481-0] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 01/06/2015] [Accepted: 01/10/2015] [Indexed: 02/05/2023]
Abstract
Diabetic nephropathy (DN) is a serious complication of diabetes mellitus (DM), which is a major public health problem in the world. To reveal the metabolic changes associated with DN, we analyzed the serum, urine, and renal extracts obtained from control and streptozotocin (STZ)-induced DN rats by (1)H NMR-based metabonomics and multivariate data analysis. A significant difference between control and DN rats was revealed in metabolic profiles, and we identified several important DN-related metabolites including increased levels of allantoin and uric acid (UA) in the DN rats, suggesting that disturbed purine metabolism may be involved in the DN. Combined with conventional histological and biological methods, we further demonstrated that xanthine oxidase (XO), a key enzyme for purine catabolism, was abnormally activated in the kidney of diabetic rats by hyperglycemia. The highly activated XO increased the level of intracellular ROS, which caused renal injury by direct oxidative damage to renal cells, and indirect inducing inflammatory responses via activating NF-κB signaling pathway. Our study highlighted that metabonomics is a promising tool to reveal the metabolic changes and the underlying mechanism involved in the pathogenesis of DN.
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Affiliation(s)
- Jingping Liu
- Key Laboratory of Transplant Engineering and Immunology, Regenerative Medicine Research Center, West China Hospital, Sichuan University, No. 1 Keyuan 4th Road, Gaopeng Ave, Chengdu, 610041, China
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15
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Xiang LW, Li J, Lin JM, Li HF. Determination of gouty arthritis' biomarkers in human urine using reversed-phase high-performance liquid chromatography. J Pharm Anal 2013; 4:153-158. [PMID: 29403877 PMCID: PMC5761083 DOI: 10.1016/j.jpha.2013.11.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 11/30/2013] [Indexed: 11/18/2022] Open
Abstract
Creatinine, uric acid, hypoxanthine and xanthine are important diagnostic biomarkers in human urine for gouty arthritis or renal disease diacrisis. A simple method for simultaneous determination of these biomarkers in urine based on reversed-phase high-performance liquid chromatography (RP-HPLC) with ultraviolet (UV) detector was proposed. After pretreatment by dilution, centrifugation and filtration, the biomarkers in urine samples were separated by ODS-BP column by elution with methanol/50 mM NaH2PO4 buffer solution at pH 5.26 (5:95). Good linearity between peak areas and concentrations of standards was obtained for the biomarkers with correlation coefficients in the range of 0.9957–0.9993. The proposed analytical method has satisfactory repeatability (the recovery of data in a range of creatinine, uric acid, hypoxanthine and xanthine was 93.49–97.90%, 95.38–96.45%, 112.46–115.78% and 90.82–97.13% with standard deviation of <5%, respectively) and the limits of detection (LODs, S/N≥3) for creatinine, uric acid, hypoxanthine, and xanthine were 0.010, 0.025, 0.050 and 0.025 mg/L, respectively. The established method was proved to be simple, accurate, sensitive and reliable for the quantitation of gouty arthritis' biomarkers in human urine samples. The ratio of creatinine to uric acid was found to be a possible factor for assessment of gouty arthritis.
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Affiliation(s)
- Lei-Wen Xiang
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
- Institute of Food and Fermentation Industries, Fuqing Branch of Fujian Normal University, Fuqing 350300, China
| | - Jing Li
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jin-Ming Lin
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Hai-Fang Li
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
- Corresponding author. Tel./fax: +86 10 62797463.
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Early brain injury: a common mechanism in subarachnoid hemorrhage and global cerebral ischemia. Stroke Res Treat 2013; 2013:394036. [PMID: 23533958 PMCID: PMC3603523 DOI: 10.1155/2013/394036] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/27/2013] [Indexed: 12/19/2022] Open
Abstract
Early brain injury (EBI) has become an area of extreme interest in the recent years and seems to be a common denominator in the pathophysiology of global transient ischemia and subarachnoid hemorrhage (SAH). In this paper, we highlight the importance of cerebral hypoperfusion and other mechanisms that occur in tandem in both pathologies and underline their possible roles in triggering brain injury after hemorrhagic or ischemic strokes.
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Burdett TC, Desjardins CA, Logan R, McFarland NR, Chen X, Schwarzschild MA. Efficient determination of purine metabolites in brain tissue and serum by high-performance liquid chromatography with electrochemical and UV detection. Biomed Chromatogr 2013; 27:122-9. [PMID: 22674671 PMCID: PMC9979337 DOI: 10.1002/bmc.2760] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 04/26/2012] [Indexed: 12/27/2022]
Abstract
The purine metabolic pathway has been implicated in neurodegeneration and neuroprotection. High-performance liquid chromatography (HPLC) is widely used to determine purines and metabolites. However, methods for analysis of multiple purines in a single analysis have not been standardized, especially in brain tissue. We report the development and validation of a reversed-phase HPLC method combining electrochemical and UV detection after a short gradient run to measure seven purine metabolites (adenosine, guanosine, inosine, guanine, hypoxanthine, xanthine and urate) from the entire purine metabolic pathway. The limit of detection (LoD) for each analyte was determined. The LoD using UV absorption was 0.001 mg/dL for hypoxanthine (Hyp), inosine (Ino), guanosine (Guo) and adenosine (Ado), and those using coulometric electrodes were 0.001 mg/dL for guanine (Gua), 0.0001 mg/dL for urate (UA) and 0.0005 mg/dL for xanthine (Xan). The intra- and inter-day coefficient of variance was generally <8%. Using this method, we determined basal levels of these metabolites in mouse brain and serum, as well as in post-mortem human brain. Peak identities were confirmed by enzyme degradation. Spike recovery was performed to assess accuracy. All recoveries fell within 80-120%. Our HPLC method provides a sensitive, rapid, reproducible and low-cost method for determining multiple purine metabolites in a single analysis in serum and brain specimens.
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Affiliation(s)
- Thomas C. Burdett
- The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, 114 16th, Charlestown, MA 02129, USA
| | - Cody A. Desjardins
- The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, 114 16th, Charlestown, MA 02129, USA
| | - Robert Logan
- The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, 114 16th, Charlestown, MA 02129, USA
| | - Nikolaus R. McFarland
- University of Florida, Department of Neurology Center for Translational Research in Neurodegenerative Disease, PO Box 100159, Gainesville, FL 32610, USA
| | - Xiqun Chen
- The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, 114 16th, Charlestown, MA 02129, USA,Correspondence to: Xiqun Chen, The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School 114 16th, Charlestown, MA 02129, USA.
| | - Michael A. Schwarzschild
- The MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, 114 16th, Charlestown, MA 02129, USA
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Metabolomics classifies phase of care and identifies risk for mortality in a porcine model of multiple injuries and hemorrhagic shock. J Trauma Acute Care Surg 2012; 73:S147-55. [PMID: 22847086 DOI: 10.1097/ta.0b013e3182609821] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Early recognition and intervention in hemorrhagic shock is essential to improved outcomes. However, the lack of robust diagnostic tools readily available to identify patients in the field inhibits the ability to provide timely intervention. Therefore, the development of a reliable prognostic indicator, such as a serum biomarker or a metabolic profile, has significant potential to improve far-forward trauma care. In this study, we used metabolomics as a tool to identify a metabolic state associated with the hemorrhagic shock and outcome in our porcine model of multiple injuries, shock, and resuscitation. METHODS Proton nuclear magnetic resonance spectroscopy was used to evaluate serum metabolites from 23 animals that underwent multiple injuries, controlled hemorrhage, and 20 hours of a standard resuscitation protocol. Serum samples were collected from the animals at baseline (before hemorrhage), at shock (after 45 minutes of shock), and at 8 hours of full resuscitation. RESULTS We were able to demonstrate shifts in the metabolome throughout different time points and construct a metabolic profile associated with mortality using partial least squares discriminate analysis. The metabolites most responsible for the classification of hemorrhagic shock in our model serve as markers for ischemia, changes in energy production, and cellular damage. Hemorrhagic shock was characterized by marked increases in tricarboxylic acid cycle intermediates, glycolytic-gluconeogenic by-products, purine-pyrimidine catabolism, and fatty acid oxidation. CONCLUSION The results of this study demonstrate the potential for metabolomics as a tool to classify the metabolic flux, to identify relevant biochemical pathways, and to identify clinically useful biomarkers.
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Aoyama K, Nakaki T. Inhibition of GTRAP3-18 may increase neuroprotective glutathione (GSH) synthesis. Int J Mol Sci 2012; 13:12017-12035. [PMID: 23109897 PMCID: PMC3472789 DOI: 10.3390/ijms130912017] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 08/06/2012] [Accepted: 09/10/2012] [Indexed: 01/24/2023] Open
Abstract
Glutathione (GSH) is a tripeptide consisting of glutamate, cysteine, and glycine; it has a variety of functions in the central nervous system. Brain GSH depletion is considered a preclinical sign in age-related neurodegenerative diseases, and it promotes the subsequent processes toward neurotoxicity. A neuroprotective mechanism accomplished by increasing GSH synthesis could be a promising approach in the treatment of neurodegenerative diseases. In neurons, cysteine is the rate-limiting substrate for GSH synthesis. Excitatory amino acid carrier 1 (EAAC1) is a neuronal cysteine/glutamate transporter in the brain. EAAC1 translocation to the plasma membrane promotes cysteine uptake, leading to GSH synthesis, while being negatively regulated by glutamate transport associated protein 3-18 (GTRAP3-18). Our recent studies have suggested GTRAP3-18 as an inhibitory factor for neuronal GSH synthesis. Inhibiting GTRAP3-18 function is an endogenous mechanism to increase neuron-specific GSH synthesis in the brain. This review gives an overview of EAAC1-mediated GSH synthesis, and its regulatory mechanisms by GTRAP3-18 in the brain, and a potential approach against neurodegeneration.
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Affiliation(s)
| | - Toshio Nakaki
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +81-3-3964-1211; Fax: +81-3-3964-0602
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Zinellu A, Sotgia S, Deiana L, Carru C. Field-amplified sample injection combined with pressure-assisted capillary electrophoresis UV detection for the simultaneous analysis of allantoin, uric acid, and malondialdehyde in human plasma. Anal Bioanal Chem 2011; 399:2855-61. [DOI: 10.1007/s00216-010-4648-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Revised: 12/17/2010] [Accepted: 12/22/2010] [Indexed: 02/05/2023]
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21
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HPLC-UV measurements of metabolites in the supernatant of endothelial cells exposed to oxidative stress. Anal Bioanal Chem 2010; 396:1763-71. [DOI: 10.1007/s00216-009-3398-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Accepted: 12/10/2009] [Indexed: 01/08/2023]
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22
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Zhang J, Chakraborty U, Foley JP. Determination of residual cell culture media components by MEKC. Electrophoresis 2009; 30:3971-7. [DOI: 10.1002/elps.200900169] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Kand'ár R, Záková P. Allantoin as a marker of oxidative stress in human erythrocytes. Clin Chem Lab Med 2008; 46:1270-4. [PMID: 18636793 DOI: 10.1515/cclm.2008.244] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Uric acid is the final product of purine metabolism in humans. It was determined that this compound has important antioxidative properties and it may be oxidized to allantoin by various reactive oxygen species. Therefore, the measurement of allantoin may be useful for the determination of oxidative stress in humans. METHODS We measured allantoin and uric acid in human plasma and erythrocytes obtained from patients with chronic renal failure before hemodialysis (n=30) and blood donors (n=30). We used a method based on selective isolation of allantoin from deproteinized plasma and erythrocyte lysate samples on AG 1-X8 resin and its derivatization to glyoxylate-2, 4-dinitrophenylhydrazone. Separation of glyoxylate-2, 4-dinitrophenylhydrazone from interfering substances was achieved on reversed phase HPLC with gradient elution and UV/VIS detection at 360 nm. Uric acid was determined by reversed phase HPLC with UV/VIS detection at 292 nm. RESULTS We found significant differences in allantoin and uric acid concentration between the patients with chronic renal failure and the control group both in plasma (20.5+/-6.5 micromol/L and 323.9+/-62.9 micromol/L vs. 2.1+/-1.1 micromol/L and 270.1+/-62.3 micromol/L, p<0.05) and erythrocytes [82.8+/-39.1 nmol/g hemoglobin (Hb) and 110.7+/-28.8 nmol/g Hb vs. 20.1+/-6.1 nmol/g Hb and 82.1+/-23.7 nmol/g Hb, p<0.05]. CONCLUSIONS Significant higher levels of allantoin in both plasma and erythrocytes of patients with chronic renal failure indicate that allantoin may be used as a good marker of oxidative stress.
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Affiliation(s)
- Roman Kand'ár
- Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic.
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Thomale UW, Griebenow M, Mautes A, Beyer TF, Dohse NK, Stroop R, Sakowitz OW, Unterberg AW, Stover JF. Heterogeneous regional and temporal energetic impairment following controlled cortical impact injury in rats. Neurol Res 2008; 29:594-603. [PMID: 17535559 DOI: 10.1179/016164107x166272] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVES Following traumatic brain injury metabolic stability is impaired. Duration and reversibility of these changes might be important to guide specific interventions. METHODS To characterize temporal and regional changes in cerebral metabolism, 68 male Sprague-Dawley rats were subjected to a focal cortical contusion. Lesion progression and mitochondrial impairment were determined by magnetic resonance imaging (MRI) and triphenyl tetrazolium chloride (TTC) staining, respectively. Metabolic alterations were determined at hours 6 and 24 and day 7 by measuring extracellular glucose, lactate and hypoxanthine levels with microdialysis catheters placed adjacent and distant to the contusion and by quantifying changes in tissue ATP, lactate and glucose using bioluminescence imaging. RESULTS The cortical lesion reached its maximal extent at hour 24 and remained confined to the ipsilateral hemisphere. In microdialysate, at hour 6, extracellular hypoxanthine and lactate reached maximal values, thereafter hypoxanthine normalized while lactate remained increased. Extracellular glucose reached the highest values at hour 24 and remained elevated. Bioluminescence imaging revealed heterogeneous changes in areas distant to the contusion. No significant changes were found in ATP content. Slightly elevated tissue glucose until 24 hours in the ipsilateral hemisphere was observed. Following a continuous increase, lactate levels were the highest by 6 hours in the ipsilateral cortex and hippocampus. DISCUSSION CCI is associated with disturbances in energetic metabolism. Metabolic perturbation is not restricted to the early phase and the contusional region following focal cortical contusion, but also involves hippocampus and primarily uninjured parts of the hemisphere.
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Affiliation(s)
- Ulrich W Thomale
- Department of Neurosurgery, Charité Campus Virchow, Medical School of Berlin, Augustenburger Platz 1, D-13353 Berlin, Germany.
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Oxidative stress in subarachnoid haemorrhage: significance in acute brain injury and vasospasm. ACTA NEUROCHIRURGICA SUPPLEMENT 2008; 104:33-41. [DOI: 10.1007/978-3-211-75718-5_7] [Citation(s) in RCA: 169] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Caussé E, Pradelles A, Dirat B, Negre-Salvayre A, Salvayre R, Couderc F. Simultaneous determination of allantoin, hypoxanthine, xanthine, and uric acid in serum/plasma by CE. Electrophoresis 2007; 28:381-7. [PMID: 17177243 DOI: 10.1002/elps.200600205] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Allantoin (All) is an oxidative end product of purines in mammals. The small amount of All present in human plasma or serum results from free radical action on urate and may provide a stable marker of in vivo free radical activity. Because free radicals have been implicated in the development and progression of atherosclerosis, this study focused on the metabolic compounds of the All pathway. We propose a new fast CE (CE/UV) method for the simultaneous determination of All, uric acid (UA), hypoxanthine (HX), and xanthine (X) in human plasma. These products were quantified in the plasma of patients with chronic renal failure before hemodialysis (n = 6), patients with chronic heart failure (n = 6) and controls (n = 6). The filtered plasma were diluted ten-fold before the direct injection in CE/UV (195 nm), which allows separating the four compounds in less than 13 min. The metabolites were detectable at concentrations of 0.3-0.6 micromol/L. The method was linear over the range 0.5-150 micromol/L for All, HX, and X and 10-1500 micromol/L for UA (r > 0.99). The analytical performance of this method is satisfactory with intra-assay CV < 3.4%, inter-assay CV < 5% (HX and X < 7%), and recovery (93-101%). The proposed CE-UV method appears to be a useful tool for studying physiological and pathological changes of HX, UA, and All levels in plasma samples, the latter being a possible indicator of free radical damage in vivo.
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Affiliation(s)
- Elizabeth Caussé
- Laboratoire de Biochimie and INSERM U466, Centre Hospitalier Rangueil, Toulouse, France.
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Chapple ILC, Matthews JB. The role of reactive oxygen and antioxidant species in periodontal tissue destruction. Periodontol 2000 2007; 43:160-232. [PMID: 17214840 DOI: 10.1111/j.1600-0757.2006.00178.x] [Citation(s) in RCA: 516] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Iain L C Chapple
- Unit of Periodontology, The University of Birmingham School of Dentistry, Birmingham, UK
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Shestopalov AV, Shkurat TP, Mikashinovich ZI, Kryzhanovskaya IO, Bogacheva MA, Lomteva SV, Prokof’ev VN, Gus’kov EP. Biological functions of allantoin. BIOL BULL+ 2006. [DOI: 10.1134/s1062359006050037] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Free radicals are reactive compounds that are naturally produced in the human body. They can exert positive effects (e.g. on the immune system) or negative effects (e.g. lipids, proteins or DNA oxidation). To limit these harmful effects, an organism requires complex protection - the antioxidant system. This system consists of antioxidant enzymes (catalase, glutathione peroxidase, superoxide dismutase) and non-enzymatic antioxidants (e.g. vitamin E [tocopherol], vitamin A [retinol], vitamin C [ascorbic acid], glutathione and uric acid). An imbalance between free radical production and antioxidant defence leads to an oxidative stress state, which may be involved in aging processes and even in some pathology (e.g. cancer and Parkinson's disease). Physical exercise also increases oxidative stress and causes disruptions of the homeostasis. Training can have positive or negative effects on oxidative stress depending on training load, training specificity and the basal level of training. Moreover, oxidative stress seems to be involved in muscular fatigue and may lead to overtraining.
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Affiliation(s)
- Julien Finaud
- Laboratoire Biologie Interuniversitaire des Activités Physiques et Sportives, Université Blaise Pascal de Clermont-Ferrand, Aubière, France.
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Marklund N, Salci K, Ronquist G, Hillered L. Energy metabolic changes in the early post-injury period following traumatic brain injury in rats. Neurochem Res 2006; 31:1085-93. [PMID: 16909313 DOI: 10.1007/s11064-006-9120-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/19/2006] [Indexed: 12/18/2022]
Abstract
Impaired cerebral energy metabolism may be a major contributor to the secondary injury cascade that occurs following traumatic brain injury (TBI). To estimate the cortical energy metabolic state following mild and severe controlled cortical contusion (CCC) TBI in rats, ipsi-and contralateral cortical tissues were frozen in situ at 15 and 40 min post-injury and adenylate (ATP, ADP, AMP) levels were analyzed using high-performance liquid chromatography (HPLC) and the energy charge (EC) was calculated. At 15 min post-injury, mildly brain-injured animals showed a 43% decrease in cortical ATP levels and a 2.4-fold increase in AMP levels (P < 0.05), and there was a significant reduction of the ipsilateral cortical EC when compared to sham-injured animals (P < 0.05). At 40 min post-injury, the ipsilateral adenylate levels and EC had recovered to the values observed in the sham-injury group. In the severe CCC group, there was a 51% decrease in ipsilateral cortical ATP levels and a 5.3-fold increase in AMP levels with a significant reduction of cortical EC at 15 min post-injury (P < 0.05). At 40 min post-injury, a 2.6-fold ipsilateral increase in AMP levels and an 11% and 44% decrease in EC and ATP levels, respectively, remained (P < 0.05). A 37-38% reduction of the total adenylate pool was observed ipsilaterally in both CCC severity groups at the early time-point, and a 19% and 28% decrease remained in the mild and severe CCC groups, respectively, at 40 min post-injury. Significant contralateral ATP and EC changes were only observed in the severe CCC group at 40 min post-injury (P < 0.05). The energy-requiring secondary injury cascades that occur early post-injury do not challenge the brain tissue to the extent of ATP depletion and may provide a window of opportunity for therapeutic intervention.
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Affiliation(s)
- Niklas Marklund
- Department of Neuroscience, Neurosurgery, Uppsala University Hospital, SE-75185 Uppsala, Sweden.
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31
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Tsahar E, Arad Z, Izhaki I, Guglielmo CG. The relationship between uric acid and its oxidative product allantoin: a potential indicator for the evaluation of oxidative stress in birds. J Comp Physiol B 2006; 176:653-61. [PMID: 16705445 DOI: 10.1007/s00360-006-0088-5] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Revised: 04/17/2006] [Accepted: 04/18/2006] [Indexed: 01/23/2023]
Abstract
Uric acid is the main nitrogenous waste product in birds but it is also known to be a potent antioxidant. Hominoid primates and birds lack the enzyme urate oxidase, which oxidizes uric acid to allantoin. Consequently, the presence of allantoin in their plasma results from non-enzymatic oxidation. In humans, the allantoin to uric acid ratio in plasma increases during oxidative stress, thus this ratio has been suggested to be an in vivo marker for oxidative stress in humans. We measured the concentrations of uric acid and allantoin in the plasma and ureteral urine of white-crowned sparrows (Zonotrichia leucophrys gambelii) at rest, immediately after 30 min of exercise in a hop/hover wheel, and after 1 h of recovery. The plasma allantoin concentration and the allantoin to uric acid ratio did not increase during exercise but we found a positive relationship between the concentrations of uric acid and allantoin in the plasma and in the ureteral urine in the three activity phases. In the plasma, the slope of the regression describing the above positive relationships was significantly higher immediately after activity. We suggest that the slope indicates the rate of uric acid oxidation and that during activity this rate increases as a result of higher production of free radicals. The present study demonstrates that allantoin is present in the plasma and in the ureteral urine of white-crowned sparrows and therefore might be useful as an indicator of oxidative stress in birds.
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Affiliation(s)
- Ella Tsahar
- Department of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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Kand'ár R, Záková P, Muzáková V. Monitoring of antioxidant properties of uric acid in humans for a consideration measuring of levels of allantoin in plasma by liquid chromatography. Clin Chim Acta 2006; 365:249-56. [PMID: 16194528 DOI: 10.1016/j.cca.2005.09.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2005] [Revised: 08/26/2005] [Accepted: 09/02/2005] [Indexed: 02/04/2023]
Abstract
Uric acid is the end product of purine metabolism in humans. It has been pointed out that uric acid acts as an antioxidant and is capable to react with biologically relevant oxidants to form allantoin. Therefore, measurement of allantoin in humans was proposed as a marker of oxidative stress. We estimated allantoin in human plasma obtained from the patients with chronic renal failure before hemodialysis (n=30), patients with non-insulin dependent diabetes mellitus (n=30) and blood donors (n=30) using a method based on selective isolation of allantoin from deproteinized plasma samples on AG 1-X8 resin and its derivatization to glyoxylate-2,4-dinitrophenylhydrazone. The method is free from urate and glyoxylate interferences. Separation of glyoxylate-2,4-dinitrophenylhydrazone from other hydrazones was achieved on reversed phase HPLC with gradient elution and UV/VIS detection at 360 nm. The analytical performance of this method is satisfactory with intra-assay CV 5.7%, inter-assay CV 8.3% and recovery 94.1%. We have determined other parameters of oxidative stress (malondialdehyde, total antioxidant status, superoxide dismutase and glutathione peroxidase) too. The preliminary reference range of allantoin in a group of blood donors is 4.76+/-2.99 micromol/L. In the patients with chronic renal failure and the patients with non-insulin dependent diabetes mellitus we found allantoin levels in plasma (27.1+/-13.8) micromol/L and (11.08+/-5.90) micromol/L, respectively. It seems that allantoin is a possible indicator of free radical damage in vivo.
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Affiliation(s)
- Roman Kand'ár
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Strossova 239, 53003 Pardubice, Czech Republic.
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Kattygnarath D, Mounier N, Madelaine-Chambrin I, Gourmel B, Le Bricon T, Gisselbrecht C, Faure P, Houzé P. Quantification of urinary allantoin by capillary zone electrophoresis during recombinant urate oxydase (rasburicase) therapy. Clin Biochem 2006; 39:86-90. [PMID: 16316640 DOI: 10.1016/j.clinbiochem.2005.09.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2005] [Revised: 08/08/2005] [Accepted: 09/12/2005] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Rasburicase (Fasturtec) is used to prevent or treat hyperuricemia associated with chemotherapy. We developed a capillary zone electrophoresis method to measure urinary allantoin, the degradation product of uric acid by rasburicase. DESIGN AND METHODS Electrophoresis was performed using a P/ACE 5500 system (Beckman) with a fused silica capillary tube and a UV-visible detector set at 214 nm. Urine samples from 10 patients with non-Hodgkin's lymphoma were analyzed to validate the technique. RESULTS Using a sodium tetraborate running buffer, urinary allantoin was separated from related compounds and internal standard in less than 30 min. The method was linear up to 1.25 g/L (quantification limit: 30 mg/L); precision was below 10%. The total amount of allantoin excreted in patients treated by rasburicase ranged from 1.5 g to 7.9 g/4 days. CONCLUSION This CZE assay is a simple, rapid and reproducible method to measure allantoin in urine. Different elimination profiles have been found in patients treated with rasburicase.
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Affiliation(s)
- D Kattygnarath
- Laboratoire de Biochimie A, AP-HP, 1 Avenue Claude Vellefaux, 75010 Paris, France
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Endogenous free radicals and antioxidants in the brain. NEURODEGENER DIS 2005. [DOI: 10.1017/cbo9780511544873.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Hillered L, Vespa PM, Hovda DA. Translational neurochemical research in acute human brain injury: the current status and potential future for cerebral microdialysis. J Neurotrauma 2005; 22:3-41. [PMID: 15665601 DOI: 10.1089/neu.2005.22.3] [Citation(s) in RCA: 223] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Microdialysis (MD) was introduced as an intracerebral sampling method for clinical neurosurgery by Hillered et al. and Meyerson et al. in 1990. Since then MD has been embraced as a research tool to measure the neurochemistry of acute human brain injury and epilepsy. In general investigators have focused their attention to relative chemical changes during neurointensive care, operative procedures, and epileptic seizure activity. This initial excitement surrounding this technology has subsided over the years due to concerns about the amount of tissue sampled and the complicated issues related to quantification. The interpretation of mild to moderate MD fluctuations in general remains an issue relating to dynamic changes of the architecture and size of the interstitial space, blood-brain barrier (BBB) function, and analytical imprecision, calling for additional validation studies and new methods to control for in vivo recovery variations. Consequently, the use of this methodology to influence clinical decisions regarding the care of patients has been restricted to a few institutions. Clinical studies have provided ample evidence that intracerebral MD monitoring is useful for the detection of overt adverse neurochemical conditions involving hypoxia/ischemia and seizure activity in subarachnoid hemorrhage (SAH), traumatic brain injury (TBI), thromboembolic stroke, and epilepsy. There is some data strongly suggesting that MD changes precede the onset of secondary neurological deterioration following SAH, hemispheric stroke, and surges of increased ICP in fulminant hepatic failure. These promising investigations have relied on MD-markers for disturbed glucose metabolism (glucose, lactate, and pyruvate) and amino acids. Others have focused on trying to capture other important neurochemical events, such as excitotoxicity, cell membrane degradation, reactive oxygen species (ROS) and nitric oxide (NO) formation, cellular edema, and BBB dysfunction. However, these other applications need additional validation. Although these cerebral events and their corresponding changes in neurochemistry are important, other promising MD applications, as yet less explored, comprise local neurochemical provocations, drug penetration to the human brain, MD as a tool in clinical drug trials, and for studying the proteomics of acute human brain injury. Nevertheless, MD has provided new important insights into the neurochemistry of acute human brain injury. It remains one of very few methods for neurochemical measurements in the interstitial compartment of the human brain and will continue to be a valuable translational research tool for the future. Therefore, this technology has the potential of becoming an established part of multimodality neuro-ICU monitoring, contributing unique information about the acute brain injury process. However, in order to reach this stage, several issues related to quantification and bedside presentation of MD data, implantation strategies, and quality assurance need to be resolved. The future success of MD as a diagnostic tool in clinical neurosurgery depends heavily on the choice of biomarkers, their sensitivity, specificity, and predictive value for secondary neurochemical events, and the availability of practical bedside methods for chemical analysis of the individual markers. The purpose of this review was to summarize the results of clinical studies using cerebral MD in neurosurgical patients and to discuss the current status of MD as a potential method for use in clinical decision-making. The approach was to focus on adverse neurochemical conditions in the injured human brain and the MD biomarkers used to study those events. Methodological issues that appeared critical for the future success of MD as a routine intracerebral sampling method were addressed.
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Affiliation(s)
- Lars Hillered
- Division of Neurosurgery, Department of Surgery, The David Geffen UCLA School of Medicine, Los Angeles, California, USA.
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36
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Jackson MJ. Use of Microdialysis to Study Interstitial Nitric Oxide and Other Reactive Oxygen and Nitrogen Species in Skeletal Muscle. Methods Enzymol 2005; 396:514-25. [PMID: 16291258 DOI: 10.1016/s0076-6879(05)96043-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Microdialysis techniques can be used to sample the interstitial space of tissues such as skeletal muscle. Analytical developments have allowed adaptations of these techniques to permit continuous monitoring of nitric oxide and a number of other reactive oxygen and nitrogen species in skeletal muscle extracellular space. Methods are described for assessment of interstitial nitrate and nitrite content, superoxide anion content, hydroxyl radical activity, and the content of relatively stable lipid radicals detectable using spin trapping and electron spin resonance techniques in skeletal muscle of rodents at rest and during contractile activity.
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Affiliation(s)
- Malcolm J Jackson
- Metabolic and Cellular Medicine, School of Clinical Sciences, University of Liverpool, Liverpool, UK
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Halliwell B, Whiteman M. Measuring reactive species and oxidative damage in vivo and in cell culture: how should you do it and what do the results mean? Br J Pharmacol 2004; 142:231-55. [PMID: 15155533 PMCID: PMC1574951 DOI: 10.1038/sj.bjp.0705776] [Citation(s) in RCA: 1499] [Impact Index Per Article: 75.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2004] [Revised: 03/08/2004] [Accepted: 03/08/2004] [Indexed: 02/06/2023] Open
Abstract
Free radicals and other reactive species (RS) are thought to play an important role in many human diseases. Establishing their precise role requires the ability to measure them and the oxidative damage that they cause. This article first reviews what is meant by the terms free radical, RS, antioxidant, oxidative damage and oxidative stress. It then critically examines methods used to trap RS, including spin trapping and aromatic hydroxylation, with a particular emphasis on those methods applicable to human studies. Methods used to measure oxidative damage to DNA, lipids and proteins and methods used to detect RS in cell culture, especially the various fluorescent "probes" of RS, are also critically reviewed. The emphasis throughout is on the caution that is needed in applying these methods in view of possible errors and artifacts in interpreting the results.
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Affiliation(s)
- Barry Halliwell
- Department of Biochemistry, Faculty of Medicine, National University of Singapore, MD 7 #03-08, 8 Medical Drive, Singapore 117597, Singapore.
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38
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Abstract
Microdialysis conceivably enables longitudinal and simultaneous investigation of several metabolites by repeated measurements in skeletal muscle. We used and evaluated microdialysis as an in vivo method to characterize the time-course and relative kinetics of pyruvate, glucose, lactate, glycerol, hypoxanthine, uric acid, and urea, in skeletal muscles, exposed to ischemia and reperfusion, in eight patients having arthroscopic-assisted anterior cruciate ligament reconstruction. A dialysis probe was implanted before surgery in the rectus femoris muscle. Dialysate samples were collected at 10-minute intervals at a flow rate of 1 microL/minute until 2 hours after tourniquet deflation. Ninety minutes of ischemia resulted in accumulation of lactate (234% +/- 38%), hypoxanthine (582% +/- 166%), and glycerol (146% +/- 46%), consumption of glucose (54% +/- 9%) and pyruvate (16% +/- 44%), and a slight decrease of urea (78% +/- 11%) compared with baseline (100%). Uric acid was unchanged (95% +/- 12%). Within 90 minutes after tourniquet deflation the concentrations were virtually normalized for all measured metabolites, suggesting that the duration of ischemia was well tolerated by the patients. The results indicate that the use of microdialysis for monitoring energy metabolic events during orthopaedic surgery that requires ischemia and reperfusion is feasible and safe.
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Affiliation(s)
- Bengt Ostman
- Department of Orthopaedics, Uppsala University, Sweden.
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Simoyi MF, Falkenstein E, Van Dyke K, Blemings KP, Klandorf H. Allantoin, the oxidation product of uric acid is present in chicken and turkey plasma. Comp Biochem Physiol B Biochem Mol Biol 2003; 135:325-35. [PMID: 12798942 DOI: 10.1016/s1096-4959(03)00086-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Urate oxidase is not present in birds yet allantoin, a product of this enzyme, has been measured in birds. Studies were designed to compare the concentrations of plasma purine derivatives in chickens and turkeys fed inosine-supplemented diets. The first study consisted of 12 male chicks that were fed diets supplemented with 0.6 mol inosine or hypoxanthine per kilogram diet from 3- to 6-week-old. Study 2 consisted of 12 turkey poults (toms) fed inosine-supplemented diets (0.7 mol/kg) from 6- to 8-week-old. Plasma allantoin and oxypurines concentrations were measured weekly using high performance liquid chromatography. Plasma uric acid (PUA) in chickens fed inosine-supplemented diets increased from 0.31 to 1.34 mM (P<0.05) at the end of week 2. In turkeys, those fed control diet had 0.17 mM PUA concentration compared to 0.3 mM in those fed the inosine diet at week 2 (P<0.05). Allantoin concentration increased in chickens from week 1 to 2 while a decrease was observed in turkeys (P<0.005) for both treatments. These data show that allantoin is present in turkey and chicken plasma. The presence of allantoin in avian plasma is consistent with uric acid acting as an antioxidant in these species.
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Affiliation(s)
- Melvin F Simoyi
- Division of Animal and Veterinary Sciences, West Virginia University, Morgantown, WV 26506-6108, USA
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Schock BC, Young IS, Brown V, Fitch PS, Shields MD, Ennis M. Antioxidants and oxidative stress in BAL fluid of atopic asthmatic children. Pediatr Res 2003; 53:375-81. [PMID: 12595583 DOI: 10.1203/01.pdr.0000049625.51462.d1] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Earlier studies in adults have indicated that increased oxidative stress may occur in the blood and airways of asthmatic subjects. Therefore the aim of this study was to compare the concentrations of antioxidants and protein carbonyls in bronchoalveolar lavage fluid of clinically stable atopic asthmatic children (AA, n = 78) with our recently published reference intervals for nonasthmatic children (C, n = 124). Additionally, lipid peroxidation products (malondialdehyde) in bronchoalveolar lavage fluid and several antioxidants in plasma were determined. Bronchoalveolar lavage concentrations (median and interquartile range) of ascorbate [AA: 0.433 (0.294-0.678) versus C: 0.418 (0.253-0.646) micromol/L], urate [AA: 0.585 (0.412-0.996) versus C: 0.511 (0.372-0.687) micromol/L], alpha-tocopherol [AA: 0.025 (0.014-0.031) versus C: 0.017 (0.017-0.260) micromol/L], and oxidized proteins as reflected by protein carbonyls [AA: 1.222 (0.970-1.635) versus C: 1.243 (0.813-1.685) nmol/mg protein] were similar in both groups (p > 0.05 in all cases). The concentration of protein carbonyls correlated significantly with the number of eosinophils, mast cells, and macrophages in AA children only. Concentrations of oxidized proteins and lipid peroxidation products (malondialdehyde) correlated significantly in AA children (r = 0.614, n = 11, p = 0.044). Serum concentrations of ascorbate, urate, retinol, alpha-tocopherol, beta-carotene, and lycopene were similar in both groups whereas alpha-carotene was significantly reduced in asthmatics. Overall, increased bronchoalveolar lavage eosinophils indicate ongoing airway inflammation, which may increase oxidatively modified proteins as reflected by increased protein carbonyl concentrations.
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Affiliation(s)
- Bettina C Schock
- Department of Clinical Biochemistry, The Queen's University of Belfast, Belfast BT12 6BJ, Northern Ireland, UK
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