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Delwing-de Lima D, Sasso S, Delwing-Dal Magro D, Pereira NR, Rodrigues AF, Schmitz F, Manoel Pereira E, Schramm do Nascimento MA, Wyse ATS. In vitro galactose impairs energy metabolism in the brain of young rats: protective role of antioxidants. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2023; 42:967-985. [PMID: 37317977 DOI: 10.1080/15257770.2023.2222776] [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: 06/07/2022] [Accepted: 06/04/2023] [Indexed: 06/16/2023]
Abstract
We, herein, investigated the in vitro effects of galactose on the activity of pyruvate kinase, succinate dehydrogenase (SDH), complex II and IV (cytochrome c oxidase) of the respiratory chain and Na+K+-ATPase in the cerebral cortex, cerebellum and hippocampus of 30-day-old rats. We also determined the influence of the antioxidants, trolox, ascorbic acid and glutathione, on the effects elicited by galactose. Galactose was added to the assay at concentrations of 0.1, 3.0, 5.0 and 10.0 mM. Control experiments were performed without galactose. Galactose, at 3.0, 5.0 and 10.0 mM, decreased pyruvate kinase activity in the cerebral cortex and at 10.0 mM in the hippocampus. Galactose, at 10.0 mM, reduced SDH and complex II activities in the cerebellum and hippocampus, and reduced cytochrome c oxidase activity in the hippocampus. Additionally, decreased Na+K+-ATPase activity in the cerebral cortex and hippocampus; conversely, galactose, at 3.0 and 5.0 mM, increased this enzyme's activity in the cerebellum. Data show that galactose disrupts energy metabolism and trolox, ascorbic acid and glutathione addition prevented the majority of alterations in the parameters analyzed, suggesting the use of antioxidants as an adjuvant therapy in Classic galactosemia.
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Affiliation(s)
- Daniela Delwing-de Lima
- Department of Medicine, University of Joinville Region, Joinville, Santa Catarina, Brazil
- Post-Graduation Program in Health and Environment, University of Joinville Region, Joinville, Santa Catarina, Brazil
| | - Simone Sasso
- Post-Graduation Program in Health and Environment, University of Joinville Region, Joinville, Santa Catarina, Brazil
| | - Débora Delwing-Dal Magro
- Department of Natural Sciences, Center of Exact and Natural Sciences, Regional University of Blumenau, Blumenau, Santa Catarina, Brazil
| | - Nariana Regina Pereira
- Department of Pharmacy, University of Joinville Region, Joinville, Santa Catarina, Brazil
| | - André Felipe Rodrigues
- Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
- Max Delbrück Center (MDC), Berlin, Germany
| | - Felipe Schmitz
- Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Eduardo Manoel Pereira
- Department of Pharmacy, University of Joinville Region, Joinville, Santa Catarina, Brazil
| | | | - Angela T S Wyse
- Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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Eni-Aganga I, Lanaghan ZM, Balasubramaniam M, Dash C, Pandhare J. PROLIDASE: A Review from Discovery to its Role in Health and Disease. Front Mol Biosci 2021; 8:723003. [PMID: 34532344 PMCID: PMC8438212 DOI: 10.3389/fmolb.2021.723003] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/18/2021] [Indexed: 01/14/2023] Open
Abstract
Prolidase (peptidase D), encoded by the PEPD gene, is a ubiquitously expressed cytosolic metalloproteinase, the only enzyme capable of cleaving imidodipeptides containing C-terminal proline or hydroxyproline. Prolidase catalyzes the rate-limiting step during collagen recycling and is essential in protein metabolism, collagen turnover, and matrix remodeling. Prolidase, therefore plays a crucial role in several physiological processes such as wound healing, inflammation, angiogenesis, cell proliferation, and carcinogenesis. Accordingly, mutations leading to loss of prolidase catalytic activity result in prolidase deficiency a rare autosomal recessive metabolic disorder characterized by defective wound healing. In addition, alterations in prolidase enzyme activity have been documented in numerous pathological conditions, making prolidase a useful biochemical marker to measure disease severity. Furthermore, recent studies underscore the importance of a non-enzymatic role of prolidase in cell regulation and infectious disease. This review aims to provide comprehensive information on prolidase, from its discovery to its role in health and disease, while addressing the current knowledge gaps.
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Affiliation(s)
- Ireti Eni-Aganga
- Center for AIDS Health Disparities Research, Nashville, TN, United States
- School of Graduate Studies and Research, Nashville, TN, United States
- Department of Microbiology, Immunology and Physiology, Nashville, TN, United States
| | - Zeljka Miletic Lanaghan
- Center for AIDS Health Disparities Research, Nashville, TN, United States
- Pharmacology Graduate Program, Vanderbilt University, Nashville, TN, United States
| | - Muthukumar Balasubramaniam
- Center for AIDS Health Disparities Research, Nashville, TN, United States
- Department of Biochemistry, Cancer Biology, Pharmacology and Neuroscience, Meharry Medical College, Nashville, TN, United States
| | - Chandravanu Dash
- Center for AIDS Health Disparities Research, Nashville, TN, United States
- School of Graduate Studies and Research, Nashville, TN, United States
- Department of Biochemistry, Cancer Biology, Pharmacology and Neuroscience, Meharry Medical College, Nashville, TN, United States
| | - Jui Pandhare
- Center for AIDS Health Disparities Research, Nashville, TN, United States
- School of Graduate Studies and Research, Nashville, TN, United States
- Department of Microbiology, Immunology and Physiology, Nashville, TN, United States
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Chen SS, Huang Y, Guo YM, Li SS, Shi Z, Niu M, Zou ZS, Xiao XH, Wang JB. Serum Metabolomic Analysis of Chronic Drug-Induced Liver Injury With or Without Cirrhosis. Front Med (Lausanne) 2021; 8:640799. [PMID: 33855035 PMCID: PMC8039323 DOI: 10.3389/fmed.2021.640799] [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: 12/12/2020] [Accepted: 03/08/2021] [Indexed: 12/25/2022] Open
Abstract
Background: Chronic drug-induced liver injury (DILI) occurs in up to 20% of all DILI patients. It presents a chronic pattern with persistent or relapsed episodes and may even progress to cirrhosis. However, its underlying development mechanism is poorly understood. Aims: To find serum metabolite signatures of chronic DILI with or without cirrhosis, and to elucidate the underlying mechanism. Methods: Untargeted metabolomics coupled with pattern recognition approaches were used to profile and extract metabolite signatures from 83 chronic DILI patients, including 58 non-cirrhosis (NC) cases, 14 compensated cirrhosis (CC) cases, and 11 decompensated cirrhosis (DC) cases. Results: Of the 269 annotated metabolites associated with chronic DILI, metabolic fingerprints associated with cirrhosis (including 30 metabolites) and decompensation (including 25 metabolites), were identified. There was a significantly positive correlation between cirrhosis-associated fingerprint (eigenmetabolite) and the aspartate aminotransferase-to-platelet ratio index (APRI) (r = 0.315, P = 0.003). The efficacy of cirrhosis-associated eigenmetabolite coupled with APRI to identify cirrhosis from non-cirrhosis patients was significantly better than APRI alone [area under the curve (AUC) value 0.914 vs. 0.573]. The decompensation-associated fingerprint (eigenmetabolite) can effectively identify the compensation and decompensation periods (AUC value 0.954). The results of the metabolic fingerprint pathway analysis suggest that the blocked tricarboxylic acid cycle (TCA cycle) and intermediary metabolism, excessive accumulation of bile acids, and perturbed amino acid metabolism are potential mechanisms in the occurrence and development of chronic DILI-associated cirrhosis. Conclusions: The metabolomic fingerprints characterize different stages of chronic DILI progression and deepen the understanding of the metabolic reprogramming mechanism of chronic DILI progression to cirrhosis.
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Affiliation(s)
- Shuai-shuai Chen
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Ying Huang
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Yu-ming Guo
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Shan-shan Li
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Zhuo Shi
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Ming Niu
- Department of Poisoning Treatment, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Zheng-sheng Zou
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Xiao-he Xiao
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
| | - Jia-bo Wang
- Department of Liver Diseases, The Fifth Medical Center of Chinese People's Liberation Army General Hospital, Beijing, China
- School of Traditional Chinese Medicine, Capital Medical University, Beijing, China
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Richmond CR, Ballantyne LL, de Guzman AE, Nieman BJ, Funk CD, Ghasemlou N. Arginase-1 deficiency in neural cells does not contribute to neurodevelopment or functional outcomes after sciatic nerve injury. Neurochem Int 2021; 145:104984. [PMID: 33561495 DOI: 10.1016/j.neuint.2021.104984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 01/13/2021] [Accepted: 02/02/2021] [Indexed: 10/22/2022]
Abstract
Arginase-1 (Arg1) is an enzyme controlling the final step of the urea cycle, with highest expression in the liver and lower expression in the lungs, pancreas, kidney, and some blood cells. Arg1 deficiency is an inherited urea cycle disorder presenting with neurological dysfunction including spastic diplegia, intellectual and growth retardation, and encephalopathy. The contribution of Arg1 expression in the central and peripheral nervous system to the development of neurological phenotypes remains largely unknown. Previous studies have shown prominent arginase-1 expression in the nervous system and post-peripheral nerve injury in mice, but very low levels in the naïve state. To investigate neurobiological roles of Arg1, we created a conditional neural (n)Arg1 knockout (KO) mouse strain, with expression eliminated in neuronal and glial precursors, and compared them to littermate controls. Long-term analysis did not reveal any major differences in blood amino acid levels, body weight, or stride gait cycle from 8 to 26-weeks of age. Brain structure measured by magnetic resonance imaging at 16-weeks of age observed only a significant decrease in the volume of the mammillary bodies. We also assessed whether nArg1, which is expressed by sensory neurons after injury, may play a role in regeneration following sciatic nerve crush. Only subtle differences were observed in locomotor and sensory recovery between nArg1 KO and control mice. These results suggest that arginase-1 expression in central and peripheral neural cells does not contribute substantially to the phenotypes of this urea cycle disorder, nor is it likely crucial for post-injury regeneration in this mouse model.
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Affiliation(s)
- Christopher R Richmond
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Laurel L Ballantyne
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - A Elizabeth de Guzman
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada; Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5T 3H7, Canada
| | - Brian J Nieman
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada; Translational Medicine, Hospital for Sick Children, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5T 3H7, Canada; Ontario Institute for Cancer Research, Ontario, M5G 0A3, Canada
| | - Colin D Funk
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
| | - Nader Ghasemlou
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada; Department of Anesthesiology & Perioperative Medicine, Queen's University, Kingston, Ontario, K7L 3N6, Canada; Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
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Cai X, Yu D, Xie Y, Zhou H. Argininemia as a cause of severe chronic stunting and partial growth hormone deficiency (PGHD): A case report. Medicine (Baltimore) 2018; 97:e9880. [PMID: 29443755 PMCID: PMC5839826 DOI: 10.1097/md.0000000000009880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/21/2018] [Accepted: 01/24/2018] [Indexed: 11/26/2022] Open
Abstract
RATIONALE Argininemia is an autosomal recessive inherited disorder of the urea cycle. Because of its atypical symptoms in early age, diagnosis can be delayed until the typical chronic manifestations - including spastic diplegia, deterioration in cognitive function, and epilepsy - appear in later childhood. PATIENT CONCERNS A Chinese boy initially presented with severe stunting and partial growth hormone deficiency (PGHD) at 3 years old and was initially treated with growth hormone replacement therapy. Seven years later (at 10 years old), he presented with spastic diplegia, cognitive function lesions, epilepsy, and peripheral neuropathy. DIAGNOSES Ultimately, the patient was diagnosed with argininemia with homozygous mutation (c.32T>C) of the ARG1 gene at 10 years old. Blood tests showed mildly elevated blood ammonia and creatine kinase, and persistently elevated bilirubin. INTERVENTIONS Protein intake was limited to 0.8 g/kg/day, citrulline (150-200 mg [kg d]) was prescribed. OUTCOMES The patient's mental state and vomiting had improved after 3 months treatment. At 10 years and 9 month old, his height and weight had reached 121cm and 22kg, respectively, but his spastic diplegia symptoms had not improved. LESSONS This case demonstrates that stunting and PGHD that does not respond to growth hormone replacement therapy might hint at inborn errors of metabolism (IEM). IEM should also be considered in patients with persistently elevated bilirubin with or without abnormal liver transaminase, as well as elevated blood ammonia and creatine kinase, in the absence of hepatic disease.
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Affiliation(s)
- Xiaotang Cai
- Department of Pediatrics, West China Second University Hospital
- Key Laboratory of Obstetric and Gynaecologic and Pediatric Diseases and Birth Defects of Ministry of Education, Sichuan University, Chengdu, Sichuan, China
| | - Dan Yu
- Department of Pediatrics, West China Second University Hospital
- Key Laboratory of Obstetric and Gynaecologic and Pediatric Diseases and Birth Defects of Ministry of Education, Sichuan University, Chengdu, Sichuan, China
| | - Yongmei Xie
- Department of Pediatrics, West China Second University Hospital
- Key Laboratory of Obstetric and Gynaecologic and Pediatric Diseases and Birth Defects of Ministry of Education, Sichuan University, Chengdu, Sichuan, China
| | - Hui Zhou
- Department of Pediatrics, West China Second University Hospital
- Key Laboratory of Obstetric and Gynaecologic and Pediatric Diseases and Birth Defects of Ministry of Education, Sichuan University, Chengdu, Sichuan, China
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Delwing-de Lima D, Sasso S, Dalmedico L, Delwing-Dal Magro D, Pereira EM, Wyse ATS. Argininic acid alters markers of cellular oxidative damage in vitro: Protective role of antioxidants. ACTA ACUST UNITED AC 2017; 69:605-611. [PMID: 28554820 DOI: 10.1016/j.etp.2017.05.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 03/05/2017] [Accepted: 05/18/2017] [Indexed: 12/19/2022]
Abstract
We, herein, investigated the in vitro effects of argininic acid on thiobarbituric acid-reactive substances (TBA-RS), total sulfhydryl content and on the activities of antioxidant enzymes such as catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) in the blood, kidney and liver of 60-day-old rats. We also verified the influence of the antioxidants (each at 1.0mM) trolox and ascorbic acid, as well as of NG-nitro-l-arginine methyl ester (L-NAME) at 1.0mM, a nitric oxide synthase inhibitor, on the effects elicited by argininic acid on the parameters tested. The liver, renal cortex and renal medulla were homogenized in 10vol (1:10w/v) of 20mM sodium phosphate buffer, pH 7.4, containing 140mM KCl; and erythrocytes and plasma were prepared from whole blood samples obtained from rats. For in vitro experiments, the samples were pre-incubated for 1h at 37°C in the presence of argininic acid at final concentrations of 0.1, 1.0 and 5.0μM. Control experiments were performed without the addition of argininic acid. Results showed that argininic acid (5.0μM) enhanced CAT and SOD activities and decreased GSH-Px activity in the erythrocytes, increased CAT and decreased GSH-Px activities in the renal cortex and decreased CAT and SOD activities in the renal medulla of 60-day-old rats, as compared to the control group. Antioxidants and/or L-NAME prevented most of the alterations caused by argininic acid on the oxidative stress parameters evaluated. Data suggest that argininic acid alters antioxidant defenses in the blood and kidney of rats; however, in the presence of antioxidants and L-NAME, most of these alterations in oxidative stress were prevented. These findings suggest that oxidative stress may be make an important contribution to the damage caused by argininic acid in hyperargininemic patients and that treatment with antioxidants may be beneficial in this pathology.
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Affiliation(s)
- Daniela Delwing-de Lima
- Departamento de Medicina, Universidade da Região de Joinville - UNIVILLE, Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972, Joinville, SC, Brazil; Programa de Pós-Graduação em Saúde e Meio Ambiente, Universidade da Região de Joinville - UNIVILLE, Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972, Joinville, SC, Brazil.
| | - Simone Sasso
- Programa de Pós-Graduação em Saúde e Meio Ambiente, Universidade da Região de Joinville - UNIVILLE, Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972, Joinville, SC, Brazil
| | - Leticia Dalmedico
- Departamento de Farmácia, Universidade da Região de Joinville - UNIVILLE, Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972, Joinville, SC, Brazil
| | - Débora Delwing-Dal Magro
- Departamento de Ciências Naturais, Centro de Ciências Exatas e Naturais, Universidade Regional de Blumenau, Rua Antônio da Veiga, 140, CEP 89012-900, Blumenau, SC, Brazil
| | - Eduardo Manoel Pereira
- Departamento de Farmácia, Universidade da Região de Joinville - UNIVILLE, Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972, Joinville, SC, Brazil
| | - Angela T S Wyse
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, Porto Alegre, RS, Brazil
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Delwing-de Lima D, Delwing-Dal Magro D, Vieira CLP, Grola GMM, Fischer DA, de Souza Wyse AT. Hyperargininemia and renal oxidative stress: Prevention by antioxidants andNG-nitro-l-arginine methyl ester. J Biochem Mol Toxicol 2016; 31:1-7. [DOI: 10.1002/jbt.21830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/04/2016] [Accepted: 07/14/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Daniela Delwing-de Lima
- Departamento de Medicina; Universidade da Região de Joinville- UNIVILLE; Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972 Joinville SC Brazil
| | - Débora Delwing-Dal Magro
- Departamento de Ciências Naturais, Centro de Ciências Exatas e Naturais; Universidade Regional de Blumenau; Rua Antônio da Veiga, 140 CEP 89012-900 Blumenau SC Brazil
| | - Cindy Laís Pett Vieira
- Departamento de Farmácia; Universidade da Região de Joinville- UNIVILLE; Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972 Joinville SC Brazil
| | - Gislaine Maria Marestoni Grola
- Departamento de Farmácia; Universidade da Região de Joinville- UNIVILLE; Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972 Joinville SC Brazil
| | - Débora Adriana Fischer
- Departamento de Farmácia; Universidade da Região de Joinville- UNIVILLE; Rua Paulo Malschitzki, 10 - Zona Industrial Norte, CEP 89201-972 Joinville SC Brazil
| | - Angela Terezinha de Souza Wyse
- Laboratório deNeuroproteção e Doenças Neurometabólicas, Departamento de Bioquímica, ICBS; Universidade Federal do Rio Grande do Sul; Rua Ramiro Barcelos, 2600-Anexo Porto Alegre RS Brazil
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Hyperargininemia due to arginase I deficiency: the original patients and their natural history, and a review of the literature. Amino Acids 2015; 47:1751-62. [DOI: 10.1007/s00726-015-2032-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 06/13/2015] [Indexed: 12/30/2022]
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Sasso S, Dalmedico L, Delwing-Dal Magro D, Wyse ATS, Delwing-de Lima D. Effect ofN-acetylarginine, a metabolite accumulated in hyperargininemia, on parameters of oxidative stress in rats: protective role of vitamins and L-NAME. Cell Biochem Funct 2014; 32:511-9. [DOI: 10.1002/cbf.3045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 06/17/2014] [Accepted: 06/19/2014] [Indexed: 12/20/2022]
Affiliation(s)
- Simone Sasso
- Mestrado em Saúde e Meio Ambiente; Universidade da Região de Joinville-UNIVILLE; Joinville SC Brazil
| | - Leticia Dalmedico
- Departamento de Farmácia; Universidade da Região de Joinville-UNIVILLE; Joinville SC Brazil
| | - Débora Delwing-Dal Magro
- Departamento de Ciências Naturais, Centro de Ciências Exatas e Naturais; Universidade Regional de Blumenau; Blumenau SC Brazil
| | - Angela T. S. Wyse
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde; Universidade Federal do Rio Grande do Sul; Porto Alegre RS Brazil
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Kolling J, Scherer EBS, Siebert C, Hansen F, Torres FV, Scaini G, Ferreira G, de Andrade RB, Gonçalves CAS, Streck EL, Wannmacher CMD, Wyse ATS. Homocysteine induces energy imbalance in rat skeletal muscle: is creatine a protector? Cell Biochem Funct 2012; 31:575-84. [PMID: 23225327 DOI: 10.1002/cbf.2938] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 10/23/2012] [Accepted: 11/15/2012] [Indexed: 12/22/2022]
Abstract
Homocystinuria is a neurometabolic disease caused by a severe deficiency of cystathionine beta-synthase activity, resulting in severe hyperhomocysteinemia. Affected patients present several symptoms including a variable degree of motor dysfunction. In this study, we investigated the effect of chronic hyperhomocysteinemia on the cell viability of the mitochondrion, as well as on some parameters of energy metabolism, such as glucose oxidation and activities of pyruvate kinase, citrate synthase, isocitrate dehydrogenase, malate dehydrogenase, respiratory chain complexes and creatine kinase in gastrocnemius rat skeletal muscle. We also evaluated the effect of creatine on biochemical alterations elicited by hyperhomocysteinemia. Wistar rats received daily subcutaneous injections of homocysteine (0.3-0.6 µmol/g body weight) and/or creatine (50 mg/kg body weight) from the 6th to the 28th days of age. The animals were decapitated 12 h after the last injection. Homocysteine decreased the cell viability of the mitochondrion and the activities of pyruvate kinase and creatine kinase. Succinate dehydrogenase was increased other evaluated parameters were not changed by this amino acid. Creatine, when combined with homocysteine, prevented or caused a synergistic effect on some changes provoked by this amino acid. Creatine per se or creatine plus homocysteine altered glucose oxidation. These findings provide insights into the mechanisms by which homocysteine exerts its effects on skeletal muscle function, more studies are needed to elucidate them. Although creatine prevents some alterations caused by homocysteine, it should be used with caution, mainly in healthy individuals because it could change the homeostasis of normal physiological functions.
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Affiliation(s)
- Janaína Kolling
- Laboratório de Neuroproteção e Doenças Neurometabólicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil; Laboratório de Erros Inatos do Metabolismo, Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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de Lima DD, Delwing F, da Cruz JGP, Wyse ATS, Delwing-Dal Magro D. Protective effect of antioxidants on blood oxidative stress caused by arginine. Fundam Clin Pharmacol 2011; 26:250-8. [PMID: 21210846 DOI: 10.1111/j.1472-8206.2010.00909.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, we investigated in vivo and in vitro effect of arginine on parameters of oxidative stress namely thiobarbituric acid-reactive substances (TBA-RS) and total radical-trapping antioxidant parameter (TRAP) in plasma and on the antioxidant enzymes activities catalase (CAT), glutathione peroxidase (GSH-Px), and superoxide dismutase (SOD) in erythrocytes of rats. Results showed that acute administration reduced TRAP and CAT activity and increased TBA-RS. Furthermore, in vitro studies did not alter oxidative parameters studied. The influence of N(ω)-nitro-L-arginine methyl ester (L-NAME) and antioxidants (α-tocopherol plus ascorbic acid) on the effects elicited by arginine was also studied. In addition, simultaneous injection of L-NAME or treatment with antioxidants prevented the alteration on TRAP, TBA-RS, and CAT activity caused by arginine. Data indicate that oxidative stress induction is probably mediated by the generation of NO and/or ONOO(-) and other free radicals, because L-NAME and these antioxidants prevented these effects caused by arginine.
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Affiliation(s)
- Daniela Delwing de Lima
- Departamento de Medicina, Universidade da Região de Joinville- UNIVILLE, Campus Universitário, Bairro Bom Retiro, CEP 89201-972, Joinville, SC, Brazil
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12
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Kolling J, Wyse ATS. Creatine prevents the inhibition of energy metabolism and lipid peroxidation in rats subjected to GAA administration. Metab Brain Dis 2010; 25:331-8. [PMID: 20830606 DOI: 10.1007/s11011-010-9215-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Accepted: 07/06/2010] [Indexed: 11/30/2022]
Abstract
Guanidinoacetate methyltransferase (GAMT) deficiency is an inherited neurometabolic disorder, biochemically characterized by the tissue accumulation of guanidinoacetate (GAA). Affected patients present epilepsy and mental retardation whose etiopathogeny is unclear. Previous reports have shown that GAA alters brain energy metabolism and that creatine, which is depleted in patients with GAMT deficiency, can act as a neuroprotector; as such, in the present study we investigated the effect of creatine administration on some of the altered parameters of energy metabolism (complex II, Na(+),K(+)-ATPase and creatine kinase) and lipid peroxidation caused by intrastriatal administration of GAA in adult rats. Animals were pretreated for 7 days with daily intraperitonial administrations of creatine. Subsequently, these animals were divided into two groups: Group 1 (sham group), rats that suffered surgery and received saline; and group 2 (GAA-treated). Thirty min after GAA or saline, the animals were sacrificed and the striatum dissected out. Results showed that the administration of creatine was able to reverse the activities of complex II, Na(+),K(+)-ATPase and creatine kinase, as well as, the levels of thiobarbituric acid reactive substances (TBARS), an index of lipid peroxidation. These findings indicate that the energy metabolism deficit caused by GAA may be prevented by creatine, which probably acts as an antioxidant since it was able to prevent lipid peroxidation. These data may contribute, at least in part, to a better understanding of the mechanisms related to the energy deficit and oxidative stress observed in GAMT deficiency.
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Affiliation(s)
- Janaína Kolling
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, Porto Alegre, RS, Brazil
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Guanidino compounds inhibit acetylcholinesterase and butyrylcholinesterase activities: Effect neuroprotector of vitamins E plus C. Int J Dev Neurosci 2010; 28:465-73. [DOI: 10.1016/j.ijdevneu.2010.06.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2010] [Revised: 06/12/2010] [Accepted: 06/16/2010] [Indexed: 11/21/2022] Open
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Delwing D, Delwing de Lima D, Scolaro B, Kuss GG, Cruz JGP, Wyse ATS. Protective effect of antioxidants on cerebrum oxidative damage caused by arginine on pyruvate kinase activity. Metab Brain Dis 2009; 24:469-79. [PMID: 19707861 DOI: 10.1007/s11011-009-9152-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2009] [Accepted: 06/11/2009] [Indexed: 10/20/2022]
Abstract
We have demonstrated that acute arginine administration decreases antioxidant defenses and compromises enzymes of respiratory chain in rat brain. In this study we evaluated in vivo and in vitro effect of arginine on pyruvate kinase activity, as well as its effect on an important parameter of oxidative stress namely thiobarbituric acid-reactive substances (TBA-RS) in cerebrum of rats. We also tested the influence of antioxidants, namely alpha -tocopherol plus ascorbic acid on the effects elicited by arginine in order to investigate the possible participation of free radicals on the effects of arginine on these parameters. Results showed that arginine acute administration inhibited pyruvate kinase activity in cerebrum of rats, as well as increased TBA-RS. By the other hand, arginine added to the incubation medium, in vitro studies, did not alter these parameters in rat cerebrum. In addition, pretreatment with antioxidants prevented the reduction of pyruvate kinase activity and the increase of TBA-RS caused by arginine. The data indicate that acute administration of arginine induces lipid peroxidation in rat cerebrum and that the inhibition of pyruvate kinase activity caused by this amino acid was probably mediated by free radicals since antioxidants prevented such effect. It is presumed that these results might be associated, at least in part, with the neuronal dysfunction of patients affected by hyperargininemia. Finally, we suggest that the administration of antioxidants should be considered as an adjuvant therapy to specific diets in hyperargininemia.
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Affiliation(s)
- Débora Delwing
- Departamento de Ciências Naturais, Centro de Ciências Exatas e Naturais, Universidade Regional de Blumenau, Rua Antônio da Veiga, 140, CEP 89010-971, Blumenau, SC, Brasil.
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Güngör S, Akıncı A, Fırat AK, Tabel Y, Alkan A. Neuroimaging Findings in Hyperargininemia. J Neuroimaging 2008; 18:457-62. [DOI: 10.1111/j.1552-6569.2007.00217.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Delwing D, Delwing D, Bavaresco CS, Wyse AT. Protective effect of nitric oxide synthase inhibition or antioxidants on brain oxidative damage caused by intracerebroventricular arginine administration. Brain Res 2008; 1193:120-7. [DOI: 10.1016/j.brainres.2007.11.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Revised: 11/23/2007] [Accepted: 11/27/2007] [Indexed: 11/29/2022]
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Delwing D, Stefanello FM, Perry MLS, Wyse ATS. Inhibition of CO(2) production from glucose by arginine in brain slices of rats. Metab Brain Dis 2007; 22:145-55. [PMID: 17516157 DOI: 10.1007/s11011-007-9053-6] [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: 10/11/2006] [Accepted: 03/08/2007] [Indexed: 10/23/2022]
Abstract
In the present study we evaluated the in vivo effect of arginine on CO(2) production from glucose in a medium with physiological and high extracellular K(+) concentrations. We also tested the influence of the nitric oxide synthase inhibitor, N(omega)-nitro-L-arginine methyl ester (L-NAME), on the effects elicited by arginine in order to investigate the possible participation of NO and/or its derivatives on the effects of arginine on CO(2) production from glucose. Sixty-day-old rats were treated with a single intraperitoneal injection of saline (control; group I), arginine (0.8 g/kg; group II), L-NAME (2.0 mg/kg; group III) or arginine (0.8 g/kg) plus L-NAME (2.0 mg/kg; group IV) and were killed 1 h later. Results showed that arginine administration inhibited CO(2) production from glucose at physiological extracellular K(+) concentration and L-NAME prevented such effect. In contrast, arginine administration had no effect on CO(2) production from glucose at high extracellular K(+) concentration. Based on these data, we also investigated the in vitro effect of arginine on CO(2) production from glucose in a medium with physiological extracellular K(+) concentration in hippocampus slices. Results showed that arginine (0.1-1.5 mM) when added to the incubation medium did not alter CO(2) production from glucose in hippocampus slices of untreated rats. In addition, we also demonstrated that arginine inhibits Na(+), K(+)-ATPase activity. The data indicate that the reduction of CO(2) production by arginine was probably mediated by NO and/or its derivatives, which could act inhibiting the activity of Na(+), K(+)-ATPase. The results suggest that arginine impairs energy metabolism in hippocampus slices of rats.
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Affiliation(s)
- Débora Delwing
- Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003 Porto Alegre, Rio Grande do Sul, Brazil
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Delwing D, Delwing D, Gonçalves MCF, Sarkis JJF, Wyse ATS. NTPDase and 5'-nucleotidase activities of synaptosomes from hippocampus of rats subjected to hyperargininemia. Neurochem Res 2007; 32:1209-16. [PMID: 17401661 DOI: 10.1007/s11064-007-9292-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Accepted: 01/19/2007] [Indexed: 10/23/2022]
Abstract
ATP is an important excitatory neurotransmitter and adenosine acts as a neuromodulatory structure inhibiting neurotransmitters release in the central nervous system. Since the ecto-nucleotidase cascade that hydrolyzes ATP to adenosine is involved in the control of brain functions and previous studies realized in our laboratory have recently reported that acute administration of Arg decreases the NTPDase and 5'-nucleotidase activities of rat blood serum, in the present study we investigated the effect of arginine administration on NTPDase and 5'-nucleotidase activities by synaptosomes from hippocampus of rats. First, sixty-days-old rats were treated with a single or a triple intraperitoneal injection of arginine (0.8 g/Kg) or an equivalent volume of 0.9% saline solution (control) and were killed 1 h later. Second, rats received an intracerebroventricular injection of 1.5 mM arginine solution or saline (5 microL) and were killed 1 h later. We also tested the in vitro effect of arginine (0.1-1.5 mM) on nucleotide hydrolysis in synaptosomes from rat hippocampus. Results showed that intraperitoneal arginine administration did not alter nucleotide hydrolysis. On the other hand, arginine administered intracerebroventricularly reduced ATP (32%), ADP (30%) and AMP (21%) hydrolysis, respectively. In addition, arginine added to the incubation medium, provoked a decrease on ATP (19%), ADP (17%) and AMP (23%) hydrolysis, respectively. Furthermore, kinetic studies showed that the inhibitory effect of arginine was uncompetitive in relation to ATP, ADP and AMP. In conclusion, according to our results it seems reasonable to postulate that arginine alters the cascade involved in the extracellular degradation of ATP to adenosine.
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Affiliation(s)
- Débora Delwing
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003, Porto Alegre, RS, Brazil
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Delwing D, Cornélio AR, Wajner M, Wannmacher CMD, Wyse ATS. Arginine administration reduces creatine kinase activity in rat cerebellum. Metab Brain Dis 2007; 22:13-23. [PMID: 17235684 DOI: 10.1007/s11011-006-9028-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2005] [Accepted: 03/02/2006] [Indexed: 10/23/2022]
Abstract
In the present study were evaluated the in vivo effects of arginine administration on creatine kinase (CK) activity in cerebellum of rats. We also tested the influence of antioxidants, namely alpha-tocopherol and ascorbic acid and the nitric oxide synthase inhibitor, N(omega)-nitro-L-arginine methyl ester (L-NAME), on the effects elicited by Arg in order to investigate the possible participation of nitric oxide (NO) and/or its derivatives peroxynitrite (ONOO(-)) and other/or free radicals on the effects of arginine on CK activity. Sixty-day-old rats were treated with a single i.p. injection of saline (control, group I), arginine (0.8 g/kg) (group II), L-NAME (2.0 mg/kg or 20.0 mg/kg) (group III) or Arg (0.8 g/kg) plus L-NAME (2.0 mg/kg or 20.0 mg/kg) (group IV) and were killed 1 h later. In another set of experiments, the animals were pretreated for 1 week with daily i.p. administration of saline (control) or alpha-tocopherol (40 mg/kg) and ascorbic acid (100 mg/kg). Twelve hours after the last injection of the antioxidants, the rats received one i.p. injection of arginine (0.8 g/kg) or saline and were killed 1 h later. Results showed that total and cytosolic CK activities were significantly inhibited by arginine administration in cerebellum of rats, in contrast to mitochondrial CK activity which was not affected by this amino acid. Furthermore, simultaneous injection of L-NAME (20.0 mg/kg) and treatment with alpha-tocopherol and ascorbic acid prevented these effects. The data indicate that the reduction of CK activity in cerebellum of rats caused by arginine was probably mediated by NO and/or its derivatives ONOO(-)and other free radicals. Considering the importance of CK for the maintenance of energy homeostasis in the brain, if this enzyme inhibition also occurs in hyperargininemic patients, it is possible that CK inhibition may be one of the mechanisms by which arginine is neurotoxic in hyperargininemia.
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Affiliation(s)
- Débora Delwing
- Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003, Porto Alegre, RS, Brazil
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Ribeiro CAJ, Grando V, Dutra Filho CS, Wannmacher CMD, Wajner M. Evidence that quinolinic acid severely impairs energy metabolism through activation of NMDA receptors in striatum from developing rats. J Neurochem 2006; 99:1531-42. [PMID: 17230642 DOI: 10.1111/j.1471-4159.2006.04199.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In the present study we investigated the effect of intrastriatal administration of 150 nmol quinolinic acid to young rats on critical enzyme activities of energy production and transfer, as well as on 14CO2 production from [1-14C]acetate at distinct periods after quinolinic acid injection. We observed that quinolinic acid injection significantly inhibited complexes II (50%), III (46%) and II-III (35%), as well as creatine kinase (27%), but not the activities of complexes I and IV and citrate synthase in striatum prepared 12 h after treatment. In contrast, no alterations of these enzyme activities were observed 3 or 6 h after quinolinic acid administration. 14CO2 production from [1-14C]acetate was also significantly inhibited (27%) by quinolinic acid in rat striatum prepared 12 h after injection. However, no alterations of these activities were observed in striatum homogenates incubated in the presence of 100 microm quinolinic acid . Pretreatment with the NMDA receptor antagonist MK-801 and with creatine totally prevented all inhibitory effects elicited by quinolinic acid administration. In addition, alpha-tocopherol plus ascorbate and the nitric oxide synthase inhibitor l-NAME completely abolished the inhibitions provoked by quinolinic acid on creatine kinase and complex III. Furthermore, pyruvate pretreatment totally blocked the inhibitory effects of quinolinic acid injection on complex II activity and partially prevented quinolinic acid-induced creatine kinase inhibition. These observations strongly indicate that oxidative phosphorylation, the citric acid cycle and cellular energy transfer are compromised by high concentrations of quinolinic acid in the striatum of young rats and that these inhibitory effects were probably mediated by NMDA stimulation.
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Affiliation(s)
- César A J Ribeiro
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Delwing D, Tagliari B, Chiarani F, Wannmacher CMD, Wajner M, Wyse ATDS. Alpha-tocopherol and ascorbic acid administration prevents the impairment of brain energy metabolism of hyperargininemic rats. Cell Mol Neurobiol 2006; 26:177-89. [PMID: 16619133 DOI: 10.1007/s10571-006-9022-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2005] [Accepted: 10/31/2005] [Indexed: 10/24/2022]
Abstract
1. We have previously demonstrated that arginine administration induces oxidative stress and compromises energy metabolism in rat hippocampus. In the present study we initially investigated the influence of pretreatment with alpha-tocopherol and ascorbic acid on the effects produced by arginine on hippocampus energy metabolism. We also tested the effect of acute administration of arginine on various parameters of energy metabolism, namely glucose uptake, lactate release and on the activities of succinate dehydrogenase, complex II and cytochrome c oxidase in rat cerebellum, as well as the influence of pretreatment with alpha-tocopherol and ascorbic acid on the effects elicited by arginine on this structure. 2. Sixty-day-old female Wistar rats were treated with a single i.p. injection of saline (control) or arginine (0.8 g/kg) and were killed 1 h later. In another set of experiments, the animals were pretreated for 1 week with daily i.p. administration of saline (control) or alpha-tocopherol (40 mg/kg) and ascorbic acid (100 mg/kg). Twelve hours after the last injection of the antioxidants the rats received one i.p. injection of arginine (0.8 g/kg) or saline and were killed 1 h later. 3. Results showed that arginine administration significantly increased lactate release and diminished glucose uptake and the activities of succinate dehydrogenase and complex II in rat cerebellum. In contrast, complex IV (cytochrome c oxidase) activity was not changed by this amino acid. Furthermore, pretreatment with alpha-tocopherol and ascorbic acid prevented the impairment of energy metabolism caused by hyperargininemia in cerebellum and hippocampus of rats.
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Affiliation(s)
- Débora Delwing
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, Porto Alegre, RS, Brazil
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Delwing D, Gonçalves MCF, Sarkis JJF, Wyse ATS. L-NAME administration prevents the inhibition of nucleotide hydrolysis by rat blood serum subjected to hyperargininemia. Amino Acids 2005; 29:267-72. [PMID: 15977041 DOI: 10.1007/s00726-005-0216-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2004] [Accepted: 05/12/2005] [Indexed: 10/25/2022]
Abstract
The main objective of the present study was to evaluate the in vivo and in vitro effect of Arg on serum nucleotide hydrolysis. The action of Nomega-nitro-L-arginine methyl ester (L-NAME), an inhibitor of nitric oxide synthase, on the effects produced by Arg was also examined. Sixty-day-old rats were treated with a single or a triple (with an interval of 1 h between each injection) intraperitoneal injection of saline (group I), Arg (0.8 g/kg) (group II), L-NAME (2.0 mg/kg or 20 mg/kg) (group III) or Arg (0.8 g/kg) plus L-NAME (2.0 mg/kg or 20 mg/kg) (group IV) and were killed 1 h later. The present results show that a triple Arg administration decreased ATP, ADP and AMP hydrolysis. Simultaneous injection of L-NAME (20 mg/kg) prevented such effects. Arg in vitro did not alter nucleotide hydrolysis. It is suggested that in vivo Arg administration reduces nucleotide hydrolysis in rat serum, probably through nitric oxide or/and peroxynitrite formation.
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Affiliation(s)
- D Delwing
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Bavaresco CS, Zugno AI, Tagliari B, Wannmacher CMD, Wajner M, Wyse ATS. Inhibition of Na+, K+-ATPase activity in rat striatum by the metabolites accumulated in Lesch-Nyhan disease. Int J Dev Neurosci 2004; 22:11-7. [PMID: 15013074 DOI: 10.1016/j.ijdevneu.2003.11.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2003] [Revised: 11/18/2003] [Accepted: 11/20/2003] [Indexed: 02/04/2023] Open
Abstract
In the present study, we investigated the in vitro effect of hypoxanthine, xanthine and uric acid, metabolites accumulating in tissue of patients with Lesch-Nyhan disease, on Na(+), K(+)-ATPase activity in striatum of neonate rats. Results showed that all compounds significantly inhibited Na(+), K(+)-ATPase activity. We also studied the kinetics of the inhibition of Na(+), K(+)-ATPase activity caused by hypoxanthine. The apparent K(m) and V(max) of Na(+), K(+)-ATPase activity for ATP as the substrate and hypoxanthine as the inhibitor were 0.97 mM and 0.69 nmol inorganic phosphate (Pi) released per min per mg of protein, respectively. K(i)-value was 1.9 microM, and the inhibition was of the non-competitive type. We also observed that the inhibitory effects of hypoxanthine, xanthine and uric acid probably occur through the same mechanism, suggesting a common binding site for these oxypurines on Na(+), K(+)-ATPase. Therefore, it is conceivable that inhibition of brain Na(+), K(+)-ATPase activity may be involved at least in part in the neuronal dysfunction characteristic of patients with Lesch-Nyhan disease.
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Affiliation(s)
- Caren S Bavaresco
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003, Porto Alegre, RS, Brazil
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