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Yang FM, Shen L, Fan DD, Chen KH, Lee J. DMGV Is a Rheostat of T Cell Survival and a Potential Therapeutic for Inflammatory Diseases and Cancers. Front Immunol 2022; 13:918241. [PMID: 35990633 PMCID: PMC9389583 DOI: 10.3389/fimmu.2022.918241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 06/13/2022] [Indexed: 11/13/2022] Open
Abstract
Activated effector T cells (Teff) and/or compromised regulatory T cells (Treg) underlie many chronic inflammatory diseases. We discovered a novel pathway to regulate survival and expansion of Teff without compromising Treg survival and a potential therapeutic to treat these diseases. We found dimethylguanidino valeric acid (DMGV) as a rheostat for Teff survival: while cell-intrinsic DMGV generated by Alanine-Glyoxylate Aminotransferase 2 (AGXT2) is essential for survival and expansion by inducing mitochondrial ROS and regulation of glycolysis, an excessive (or exogenous) DMGV level inhibits activated Teff survival, thereby the AGXT2-DMGV-ROS axis functioning as a switch to turn on and off Teff expansion. DMGV-induced ROS is essential for glycolysis in Teff, and paradoxically DMGV induces ROS only when glycolysis is active. Mechanistically, DMGV rapidly activates mitochondrial calcium uniporter (MCU), causing a surge in mitochondrial Ca2+ without provoking calcium influx to the cytosol. The mitochondrial Ca2+ surge in turn triggers the mitochondrial Na+/Ca2+ exchanger (NCLX) and the subsequent mitochondrial Na+ import induces ROS by uncoupling the Coenzyme Q cycle in Complex III of the electron transport chain. In preclinical studies, DMGV administration significantly diminished the number of inflammatory T cells, effectively suppressing chronic inflammation in mouse models of colitis and rheumatoid arthritis. DMGV also suppressed expansion of cancer cells in vitro and in a mouse T cell leukemic model by the same mechanism. Our data provide a new pathway regulating T cell survival and a novel mode to treat autoimmune diseases and cancers.
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Affiliation(s)
- Fengyuan Mandy Yang
- School of Basic Medical Sciences, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, and the State Key Laboratory of Respiratory Diseases, Guangzhou Medical University, Guangzhou, China
| | - Liya Shen
- School of Basic Medical Sciences, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, and the State Key Laboratory of Respiratory Diseases, Guangzhou Medical University, Guangzhou, China
| | - Dengxia Denise Fan
- School of Basic Medical Sciences, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, and the State Key Laboratory of Respiratory Diseases, Guangzhou Medical University, Guangzhou, China
| | - Kuan-Hung Chen
- Department of Orthopedics, The 1st Affiliated Hospital of Sun Yat-sen University, Guangdong, China
| | - Jongdae Lee
- School of Basic Medical Sciences, Guangdong Provincial Key Laboratory of Allergy & Clinical Immunology, and the State Key Laboratory of Respiratory Diseases, Guangzhou Medical University, Guangzhou, China
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2
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Bonnitcha P, Sullivan D, Fitzpatrick M, Ireland A, Nguyen VL, Koay YC, O'Sullivan J. Design and validation of an LC-MS/MS method for simultaneous quantification of asymmetric dimethylguanidino valeric acid, asymmetric dimethylarginine and symmetric dimethylarginine in human plasma. Pathology 2022; 54:591-598. [DOI: 10.1016/j.pathol.2022.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 01/11/2022] [Accepted: 01/20/2022] [Indexed: 10/18/2022]
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3
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Bariatric Surgery Improves the Atherogenic Profile of Circulating Methylarginines in Obese Patients: Results from a Pilot Study. Metabolites 2021; 11:metabo11110759. [PMID: 34822417 PMCID: PMC8624057 DOI: 10.3390/metabo11110759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 10/27/2021] [Accepted: 10/31/2021] [Indexed: 12/04/2022] Open
Abstract
Bariatric surgery improves obesity-related comorbidities. Methylarginines are biomarkers of cardiometabolic risk, liver steatosis, and insulin resistance. Here, we aimed to investigate methylarginines in obese patients undergoing bariatric surgery and compared them to age- and sex-matched healthy subjects. Thirty-one obese patients who underwent bariatric surgery and 31 healthy individuals were used for this retrospective study. The basal serum methylarginine levels were determined in the healthy individuals and the obese patients, before surgery and 6 and 12 months after surgery, by mass spectrometry. Compared with the healthy individuals, the obese patients displayed elevated monomethylarginine (mean change: +95%, p < 0.001), asymmetric-dimethylarginine (+105%, p < 0.001), symmetric-dimethylarginine (+25%, p = 0.003), and dimethylguanidino valerate (+32%, p = 0.008) concentrations. Bariatric surgery durably reduced the body mass index by 28% (12 months, 95%CI: 24–33, p = 0.002) and improved plasma lipids, insulin resistance, and liver function. Bariatric surgery reduced the serum levels of monomethylarginine and asymmetric-dimethylarginine by 12% (95%CI: 6–17) and 36% (95%CI: 27–45) (12 months, p = 0.003), respectively, but not symmetric-dimethylarginine or dimethylguanidino valerate. The monomethylarginine and asymmetric-dimethylarginine concentrations were strongly correlated with markers of dyslipidemia, insulin resistance, and a fatty liver. Serum dimethylguanidino valerate was primarily correlated with glycemia and renal function, whereas serum symmetric-dimethylarginine was almost exclusively associated with renal function. In conclusion, the monomethylarginine and asymmetric-dimethylarginine levels are efficiently decreased by bariatric surgery, leading to a reduced atherogenic profile in obese patients. Methylarginines follow different metabolic patterns, which could help for the stratification of cardiometabolic disorders in obese patients.
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Trang DT, Huu Tai B, Hang DT, Yen PH, Huong PTT, Nhiem NX, Van Kiem P. Chemical Constituents of the Marine Sponge Aaptos aaptos (Schmidt, 1864) and Their Cytotoxic Activity. Nat Prod Commun 2021. [DOI: 10.1177/1934578x21993345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Seven compounds (1-7) were isolated from the marine sponge Aaptos aaptos living in the Vietnamese sea. Their structures were determined as 2 hours, 5 H,7 H,9 H-9 S-hydroxy-imidazo[1,5- α]pyridine-1,3-dione (1), 3-([9-methylhexadecyl]oxy)propane-1,2-diol 2, 2,3-dihydro-2,3-dioxoaaptamine (3), indol-3-aldehyde (4), methyl indole-3-carboxylate (5) 4-hydroxy-5-(indole-3-yl)−5-oxo-pentan-2-one (6), and thymidine (7) by extensive analysis of HR-ESI-MS, 1D, and 2D NMR spectral data, as well as by comparison of the spectral data with those reported in the literature. In addition, the absolute configuration of 1 was determined from the experimental ECD spectrum and comparison of this with the theoretical ECD calculations using the TDDFT method. Compounds 1 and 2 were isolated from nature for the first time. Compound 3 induced cytotoxic activity against SK-LU-1, MCF-7, HepG2, and SK-Mel-2 cell lines with IC50 values of 41.27 ± 2.63, 40.70 ± 2.65, 34.31 ± 3.43, and 36.63 ± 1.40 µM, respectively.
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Affiliation(s)
- Do Thi Trang
- Graduate University of Science and Technology, Hanoi, Vietnam
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Bui Huu Tai
- Graduate University of Science and Technology, Hanoi, Vietnam
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | | | - Pham Hai Yen
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Phan Thi Thanh Huong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nguyen Xuan Nhiem
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Phan Van Kiem
- Graduate University of Science and Technology, Hanoi, Vietnam
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
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5
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Deng L, Zhou ZH. Spontaneous conversions of glutamine, histidine and arginine into α-hydroxycarboxylates with NH 4VO 3 or V 2O 5. Dalton Trans 2020; 49:11921-11930. [PMID: 32812582 DOI: 10.1039/d0dt02150d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Glutamine gets transformed to 2-hydroxy-5-oxoproline with NH4VO3 in a neutral solution as a product of 2,2'-bipyridine oxidovanadium(v) 2-hydroxy-5-oxoproline [VV2O3(hop)2(bpy)2]·7H2O [1, H2hop = 2-hydroxy-5-oxoproline] with yields of 65.6%. Similarly, histidine and arginine are converted into the corresponding α-hydroxycarboxylates as 2,2'-bipyridine oxidovanadium(iv) 3-(1H-imidazolyl-5-yl)-2-hydroxyacrylate [VIV2O2(imha)2(bpy)2]·bpy [2, H2imha = 3-(1H-imidazolyl-5-yl)-2-hydroxyacrylic acid] and guanidinium oxidovanadium(v) 1-(aminoiminomethyl)-2-hydroxyproline (CN3H6)[VVO2(Haimhp)2]·2H2O [3, H2aimhp = 1-(aminoiminomethyl)-2-hydroxyproline] with V2O5 in low yields respectively, where an aggregate of oxidovanadium(v) arginine (H2arg)n(VVO3)n·½nH2O (4, Harg = arginine) has been isolated preferentially in an initial experiment for 3. α-Hydroxycarboxylates chelate bidentately with vanadium viaα-alkoxy and α-carboxy groups in 1-3, as observed from structural analyses. Their racemizations have been observed after the conversions. There is no coordination in 4 based on solid-state 13C NMR spectra, and only strong hydrogen bonds exist in the anion chains (VVO3)- and protonated arginines. 1 and 4 were fully characterized by elemental analysis, UV-vis, IR and solid-state 13C NMR spectroscopies, TG and X-ray structural analyses, and theoretical bond valence calculations (BVS). The conversions of glutamine, histidine and arginine occur spontaneously in a solution under ambient conditions.
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Affiliation(s)
- Lan Deng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
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Wali JA, Koay YC, Chami J, Wood C, Corcilius L, Payne RJ, Rodionov RN, Birkenfeld AL, Samocha-Bonet D, Simpson SJ, O'Sullivan JF. Nutritional and metabolic regulation of the metabolite dimethylguanidino valeric acid: an early marker of cardiometabolic disease. Am J Physiol Endocrinol Metab 2020; 319:E509-E518. [PMID: 32663097 PMCID: PMC7509244 DOI: 10.1152/ajpendo.00207.2020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Dimethylguanidino valeric acid (DMGV) is a marker of fatty liver disease, incident coronary artery disease, cardiovascular mortality, and incident diabetes. Recently, it was reported that circulating DMGV levels correlated positively with consumption of sugary beverages and negatively with intake of fruits and vegetables in three Swedish community-based cohorts. Here, we validate these results in the Framingham Heart Study Third Generation Cohort. Furthermore, in mice, diets rich in sucrose or fat significantly increased plasma DMGV concentrations. DMGV is the product of metabolism of asymmetric dimethylarginine (ADMA) by the hepatic enzyme AGXT2. ADMA can also be metabolized to citrulline by the cytoplasmic enzyme DDAH1. We report that a high-sucrose diet induced conversion of ADMA exclusively into DMGV (supporting the relationship with sugary beverage intake in humans), while a high-fat diet promoted conversion of ADMA to both DMGV and citrulline. On the contrary, replacing dietary native starch with high-fiber-resistant starch increased ADMA concentrations and induced its conversion to citrulline, without altering DMGV concentrations. In a cohort of obese nondiabetic adults, circulating DMGV concentrations increased and ADMA levels decreased in those with either liver or muscle insulin resistance. This was similar to changes in DMGV and ADMA concentrations found in mice fed a high-sucrose diet. Sucrose is a disaccharide of glucose and fructose. Compared with glucose, incubation of hepatocytes with fructose significantly increased DMGV production. Overall, we provide a comprehensive picture of the dietary determinants of DMGV levels and association with insulin resistance.
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Affiliation(s)
- Jibran A Wali
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Yen Chin Koay
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medicine, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Jason Chami
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medicine, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Courtney Wood
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medicine, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Leo Corcilius
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales, Australia
| | - Richard J Payne
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales, Australia
| | - Roman N Rodionov
- University Center for Vascular Medicine and Department of Medicine III-Section Angiology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Andreas L Birkenfeld
- Department of Internal Medicine, Division of Endocrinology, Diabetology, and Nephrology, University Hospital Tübingen, Tübingen, Germany
- Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Centre Munich at the University of Tübingen, Tübingen, Germany
- German Centre for Diabetes Research (DZD), Tübingen, Tübingen, Germany
| | - Dorit Samocha-Bonet
- The Garvan Institute of Medical Research, University of New South Wales, Sydney, New South Wales, Australia
| | - Stephen J Simpson
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Science, School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - John F O'Sullivan
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- Faculty of Medicine and Health, School of Medicine, The University of Sydney, Sydney, New South Wales, Australia
- Heart Research Institute, The University of Sydney, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
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7
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Biancalana L, Tuci G, Piccinelli F, Marchetti F, Bortoluzzi M, Pampaloni G. Vanadium(v) oxoanions in basic water solution: a simple oxidative system for the one pot selective conversion of l-proline to pyrroline-2-carboxylate. Dalton Trans 2017; 46:15059-15069. [PMID: 29063086 DOI: 10.1039/c7dt02702h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unprecedented, direct chemical oxidation of l-proline to pyrroline-2-carboxylate was achieved in water (pH 9-10) by means of NH4VO3/NH3 or V2O5/MOH (K = Na, K), and the anion was fully characterized as ammonium or alkaline metal salts. Quantitative yield and higher atom economy performance were achieved with the latter system, the alkaline salts being more stable than the ammonium one. Different mixed valence V(iv)/V(v) compounds precipitated from the reaction mixtures depending on the nature of the employed base. A possible reaction mechanism is proposed according to DFT calculations. The analogous reaction of trans-4-hydroxy-l-proline with NH4VO3/NH3 afforded pyrrole-2-carboxylic acid in 81% yield, while sarcosine underwent prevalent decomposition under similar experimental conditions. Instead, no reaction was observed with primary (glycine, l-alanine, l-phenylalanine) and tertiary α-amino acids (N,N-dimethyl-l-phenylalanine, N,N-dimethylglycine).
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Affiliation(s)
- Lorenzo Biancalana
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
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8
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O'Sullivan JF, Morningstar JE, Yang Q, Zheng B, Gao Y, Jeanfavre S, Scott J, Fernandez C, Zheng H, O'Connor S, Cohen P, Vasan RS, Long MT, Wilson JG, Melander O, Wang TJ, Fox C, Peterson RT, Clish CB, Corey KE, Gerszten RE. Dimethylguanidino valeric acid is a marker of liver fat and predicts diabetes. J Clin Invest 2017; 127:4394-4402. [PMID: 29083323 DOI: 10.1172/jci95995] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 09/21/2017] [Indexed: 01/11/2023] Open
Abstract
Unbiased, "nontargeted" metabolite profiling techniques hold considerable promise for biomarker and pathway discovery, in spite of the lack of successful applications to human disease. By integrating nontargeted metabolomics, genetics, and detailed human phenotyping, we identified dimethylguanidino valeric acid (DMGV) as an independent biomarker of CT-defined nonalcoholic fatty liver disease (NAFLD) in the offspring cohort of the Framingham Heart Study (FHS) participants. We verified the relationship between DMGV and early hepatic pathology. Specifically, plasma DMGV levels were correlated with biopsy-proven nonalcoholic steatohepatitis (NASH) in a hospital cohort of individuals undergoing gastric bypass surgery, and DMGV levels fell in parallel with improvements in post-procedure cardiometabolic parameters. Further, baseline DMGV levels independently predicted future diabetes up to 12 years before disease onset in 3 distinct human cohorts. Finally, we provide all metabolite peak data consisting of known and unidentified peaks, genetics, and key metabolic parameters as a publicly available resource for investigations in cardiometabolic diseases.
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Affiliation(s)
- John F O'Sullivan
- Cardiovascular Research Center, Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.,Charles Perkins Centre and Heart Research Institute, The University of Sydney, Sydney, Australia
| | - Jordan E Morningstar
- Division of Cardiovascular Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Qiong Yang
- Framingham Heart Study of the National Heart, Lung, and Blood Institute and Boston University School of Medicine, Framingham, Massachusetts, USA.,Biostatistics Department, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Baohui Zheng
- Cardiovascular Research Center, Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Yan Gao
- University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Sarah Jeanfavre
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Justin Scott
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | | | - Hui Zheng
- Biostatistics Department, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Sean O'Connor
- The Rockefeller University, Laboratory of Molecular Metabolism, New York, New York, USA
| | - Paul Cohen
- The Rockefeller University, Laboratory of Molecular Metabolism, New York, New York, USA
| | - Ramachandran S Vasan
- Framingham Heart Study of the National Heart, Lung, and Blood Institute and Boston University School of Medicine, Framingham, Massachusetts, USA.,Cardiology Division, Boston Medical Center, and
| | - Michelle T Long
- Gastroenterology Division, Boston Medical Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - James G Wilson
- University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Olle Melander
- Department of Clinical Sciences, Lund University, Malmö, Sweden.,Center of Emergency Medicine, Skåne University Hospital, Malmö, Sweden
| | - Thomas J Wang
- Cardiology Division, Vanderbilt University, Nashville, Tennessee, USA
| | - Caroline Fox
- Framingham Heart Study of the National Heart, Lung, and Blood Institute and Boston University School of Medicine, Framingham, Massachusetts, USA
| | - Randall T Peterson
- Cardiovascular Research Center, Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Clary B Clish
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Kathleen E Corey
- Gastroenterology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Robert E Gerszten
- Division of Cardiovascular Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.,Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
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Martens-Lobenhoffer J, Rodionov RN, Drust A, Bode-Böger SM. Detection and quantification of α-keto-δ-(NG,NG-dimethylguanidino)valeric acid: A metabolite of asymmetric dimethylarginine. Anal Biochem 2011; 419:234-40. [DOI: 10.1016/j.ab.2011.08.044] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 08/24/2011] [Accepted: 08/24/2011] [Indexed: 10/17/2022]
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10
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Fesenko AA, Tullberg ML, Shutalev AD. General approach to 6-tosyl-2,3,4,5-tetrahydro-1H-1,3-diazepin-2-ones via nucleophile-mediated ring expansion of tetrahydropyrimidines. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Findrik Z, Vasić-Rački Đ. Mathematical modelling of amino acid resolution catalyzed by l-amino acid oxidases from Crotalus adamanteus and Crotalus atrox. Process Biochem 2008. [DOI: 10.1016/j.procbio.2008.06.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Schade D, Töpker-Lehmann K, Kotthaus J, Clement B. Synthetic approaches to N(delta)-methylated L-arginine, N(omega)-hydroxy-L-arginine, L-citrulline, and N(delta)-cyano-L-ornithine. J Org Chem 2008; 73:1025-30. [PMID: 18179234 DOI: 10.1021/jo702150d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nomega-Methylated arginines such as asymmetric dimethyl-L-arginine (ADMA) and monomethyl-l-arginine (NMMA) are known as potent physiological inhibitors of nitric oxide synthases (NOSs). To explore a possible physiological and pharmaceutical relevance of N(delta)-methylated analogues, a synthetic scheme had to be developed that would not lead to N(delta)-methyl-L-arginine only but also to its presumed metabolites of NOS catalysis. Two basic synthetic approaches have been pursued to obtain N(delta)-methylated derivatives of L-ornithine, L-citrulline, L-arginine, and N(omega)-hydroxy-L-arginine. A first attempt utilized conventionally protected L-ornithine, i.e., the tert-butyl ester and Boc-amine, and led to three end compounds in excellent yields. Simultaneous protection of the alpha-amino acid moiety by formation of boroxazolidinones, particularly by employing 9-borabicyclo[3.3.1]nonane (9-BBN-H), proved to be a convenient option to perform side chain modifications and led to all of the desired end compounds. Additionally, enantiomeric excess (ee, %) of crucial synthetic intermediates and end compounds was determined by chiral HPLC.
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Affiliation(s)
- Dennis Schade
- Department of Pharmaceutical Chemistry, Pharmaceutical Institute, Christian-Albrechts-University of Kiel, Gutenbergstrasse 76-78, D-24118 Kiel, Germany
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Modelling of l-DOPA enzymatic oxidation catalyzed by l-amino acid oxidases from Crotalus adamanteus and Rhodococcus opacus. Biochem Eng J 2006. [DOI: 10.1016/j.bej.2005.08.022] [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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14
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Katz JD, Overman LE. Studies towards the total synthesis of palau'amine. Formation of 4,5-dihydropyrrole-2-carboxylate intermediates by alkene–enamide ring-closing metathesis. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.140] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Malhiac C, Tekin J, Ramiandrasoa G, Leveque H, Combret JC. SYNTHESIS OF PROTECTED α-KETOESTER DERIVATIVES USING SILYL KETENE ACETALS OF ALKYL DIALKOXYACETATES. PHOSPHORUS SULFUR 1995. [DOI: 10.1080/10426509508042550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Valters RE, Fülöp F, Korbonits D. Recent Developments in Ring–Chain Tautomerism I. Intramolecular Reversible Addition Reactions to the C=O Group**This chapter is the first part of a review that updates an earlier work by R. E. Valters and W. Flitsch, Ring-Chain Tairtomerism (A. R. Katritzky, ed.), Plenum Press, New York and London, 1985. The second part of this review, to be published in a subsequent volume of Advances in Heterocyclic Chemistry, includes data (1982‒1993) for intramolecular reversible addition reactions to C=N, C≡N, C=C, and C≡C groups. ADVANCES IN HETEROCYCLIC CHEMISTRY 1995. [DOI: 10.1016/s0065-2725(08)60173-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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17
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Castillo L, Ajami A, Branch S, Chapman TE, Yu YM, Burke JF, Young VR. Plasma arginine kinetics in adult man: response to an arginine-free diet. Metabolism 1994; 43:114-22. [PMID: 8289668 DOI: 10.1016/0026-0495(94)90166-x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To explore the response of whole-body arginine metabolism to a change in arginine intake, plasma arginine kinetics were investigated in eight healthy adult men who received an L-amino acid diet supplying an Arg-rich or Arg-free intake for 6 days before undergoing a tracer study on day 7. The tracer protocol lasted for 8 hours. For the first 3 hours subjects remained in the postabsorptive (fasted) state, and during the following 5 hours they consumed small meals at 30-minute intervals. Primed continuous intravenous infusions of L-[guanidino-13C]arginine, L-[5,5,5-2H3]leucine, and [15N2]urea were administered to estimate plasma amino acid fluxes and the rate of urea production. For the fasted and fed states, plasma arginine fluxes (mumol.kg-1.h-1, mean +/- SD) were 69 +/- 8 and 87 +/- 12 (P < .01), respectively, for the Arg-rich diet and 63 +/- 14 and 51 +/- 7 (P < .01, from Arg-rich) for the Arg-free diet. Compared with the Arg-rich results, fed-state plasma arginine and ornithine concentrations were decreased (P < .01) and citrulline concentration was increased (P < .01) during the Arg-free diet period. Leucine fluxes and rates of urea production did not differ between the diet groups. The lower fed-state arginine flux in subjects receiving the Arg-free compared with the Arg-rich diet appears to be entirely due to the decreased rate of entry of arginine from the intestine in the former group.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- L Castillo
- Laboratory of Human Nutrition and the Clinical Research Center, Massachusetts Institute of Technology, Cambridge 02149
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Castillo L, Chapman TE, Yu YM, Ajami A, Burke JF, Young VR. Dietary arginine uptake by the splanchnic region in adult humans. THE AMERICAN JOURNAL OF PHYSIOLOGY 1993; 265:E532-9. [PMID: 8238326 DOI: 10.1152/ajpendo.1993.265.4.e532] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To determine the uptake of dietary arginine and leucine by the splanchnic region, two experiments were carried out, each involving four healthy young adult men who received a diet supplying 1 g protein.kg-1.day-1 for 7 and 10 days before conducting a primed constant tracer infusion protocol. In study 1, subjects received for 8 h (3-h fast; 5-h fed state, achieved by a constant intragastric infusion of the diet formula) L-[5,5-2H2; guanidino-15N2]arginine ([M4]Arg), L-[guanidino-13C]arginine ([13C]Arg), and L-[5,5,5-2H3]leucine ([2H3]Leu) simultaneously by an intragastric infusion on day 7 and a repeat of this protocol on day 10 except with tracer administration given by vein. Plasma arginine fluxes were essentially the same for the two arginine tracers but differed significantly with route of administration. In study 2 the subjects received on day 7 a constant intravenous infusion of [13C]Arg and [2H3]Leu and a simultaneous intragastric infusion of [M4]Arg and [1-13C]leucine. On day 10 the routes of administration of these tracer pairs were reversed. During the fed state in study 1, splanchnic uptake of dietary arginine was 31 +/- 10 and 34 +/- 8%, based on the [13C]Arg and [M4]Arg tracers, respectively, and it was significantly higher (P < 0.01) than for leucine, which was 10 +/- 6%. In study 2, splanchnic uptake of dietary arginine, estimated from a series of tracer-protocol combinations for the fed state, was approximately 38% compared with a lower (P < 0.01) value of approximately 15% for leucine.
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Affiliation(s)
- L Castillo
- Laboratory of Human Nutrition, Massachusetts Institute of Technology, Cambridge 02142
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Klein C, Schulz G, Steglich W. Umwandlung phenolischer α-Aminosäuren in α-Ketosäuren. ACTA ACUST UNITED AC 1983. [DOI: 10.1002/jlac.198319830918] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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