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Sudová V, Prokop P, Trefil L, Racek J, Rajdl D. Comparison of two methods for dimethylarginines quantification. Pract Lab Med 2024; 39:e00359. [PMID: 38313812 PMCID: PMC10831080 DOI: 10.1016/j.plabm.2024.e00359] [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: 01/30/2023] [Revised: 07/10/2023] [Accepted: 01/15/2024] [Indexed: 02/06/2024] Open
Abstract
Objectives Both dimethylarginines are widely bound to chronic kidney disease (CKD). This study was focused to validate published LC-MS/MS method and compared the measured data with an immunoassay. Design and methods The analysis was performed on a Dionex UltiMate 3000 UHPLC-Standard (Thermo Fisher Scientific, Waltham, Massachusetts, USA) with an amaZon SL ion trap (Bruker, Billerica, Massachusetts, USA). Comparison was evaluated by using Passing Bablok regression and Bland Altman plot. Healthy volunteers (n = 40) were used for validation and as control group to patients group (n = 40) with different stages of CKD. Results The results in healthy controls determined by the LC-MS/MS (ELISA) method were 0.52 ± 0.0892 with 95 % CI: 0.49-0.55 (0.61 ± 0.1213 with 95 % CI: 0.57-0.64) μmol/L for AD MA and 0.56 ± 0.0810 with 95 % CI: 0.53-0.58 (0.62 ± 0.0752 with 95 % CI: 0.57-0.65) μmol/L for SDMA. In the same way, the patient group values determined by the LC-MS/MS (ELISA) method were 0.82 ± 0.1604 with 95 % CI: 0.75-0.88 (1.06 ± 0.3002 with 95 % CI: 0.94-1.19) μmol/L and 2.14 ± 0.8778 with 95 % CI: 1.47-2.58 (1.65 ± 0.5160 with 95 % CI: 1.40-1.98) μmol/L for ADMA and SDMA, respectively. The correlation between the methods, expressed as the Spearman correlation coefficient (R), was 0.858 (0.8059) for ADMA (p < 0.0001) and 0.895 (0.9607) for SDMA (p < 0.0001). Conclusions ADMA levels determined by the immunoassay were almost 30 % overestimated, in contrast to SDMA levels, which were 3 % underestimated. According to our findings, a better correlation could be obtained by simple sample dilution.
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Affiliation(s)
- Vendula Sudová
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, Pilsen, 32300, Czech Republic
- Department of Clinical Biochemistry and Haematology, Charles University and University Hospital, Pilsen, Czech Republic
| | - Pavel Prokop
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, Pilsen, 32300, Czech Republic
- Department of Clinical Biochemistry and Haematology, Charles University and University Hospital, Pilsen, Czech Republic
| | - Ladislav Trefil
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, Pilsen, 32300, Czech Republic
- Department of Clinical Biochemistry and Haematology, Charles University and University Hospital, Pilsen, Czech Republic
| | - Jaroslav Racek
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, Pilsen, 32300, Czech Republic
- Department of Clinical Biochemistry and Haematology, Charles University and University Hospital, Pilsen, Czech Republic
| | - Daniel Rajdl
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, Pilsen, 32300, Czech Republic
- Department of Clinical Biochemistry and Haematology, Charles University and University Hospital, Pilsen, Czech Republic
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Cortés Giménez-Coral A, Rodríguez-González P, González Gago A, Cernuda Morollón E, Lopez-Cancio E, Prieto García B, García Alonso JI. Comparison between one and two-dimensional liquid chromatographic approaches for the determination of plasmatic stroke biomarkers by isotope dilution and tandem mass spectrometry. Analyst 2023; 148:583-593. [PMID: 36594438 DOI: 10.1039/d2an01750d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This work presents the evaluation of one- and two-dimensional liquid chromatography for the quantification of three stroke outcome predictors in plasma. Isotopically labelled analogues of L-arginine (L-Arg), asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) are used to quantify the three analytes by isotope dilution and tandem mass spectrometry. Chromatographic isotope effects were not observed between natural L-Arg and its 15N-labelled analogue but they were observed between natural ADMA and SDMA and their multiple deuterated analogues. Under these conditions, bidimensional chromatography through the use of an automated multiple heart cutting mode provided unsatisfactory results for ADMA and SDMA due to the different amounts of natural and labelled compounds transferred from the first to the second chromatographic dimension. In contrast, using one dimensional liquid chromatography after a derivatization step to esterify carboxylic groups, chromatographic isotope effects did not alter the initial mass balance as full coelution of natural and labelled analogues or baseline resolution between the analytes was not required. This method was successfully validated following the Clinical & Laboratory Standards Institute guidelines and applied to the analysis of plasma samples from patients who had suffered from an intraparenchymal haemorrhagic stroke.
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Affiliation(s)
- Adela Cortés Giménez-Coral
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, 33006 Oviedo, Spain. .,Clinical Biochemistry, Laboratory of Medicine, Central University Hospital of Asturias, Oviedo, 33011, Spain
| | - Pablo Rodríguez-González
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, 33006 Oviedo, Spain.
| | - Adriana González Gago
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, 33006 Oviedo, Spain.
| | - Eva Cernuda Morollón
- Clinical Biochemistry, Laboratory of Medicine, Central University Hospital of Asturias, Oviedo, 33011, Spain
| | - Elena Lopez-Cancio
- Department of Neurology, Central University Hospital of Asturias, 33011 Oviedo, Spain
| | - Belén Prieto García
- Clinical Biochemistry, Laboratory of Medicine, Central University Hospital of Asturias, Oviedo, 33011, Spain
| | - J Ignacio García Alonso
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, 33006 Oviedo, Spain.
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Overexpression of alanine-glyoxylate aminotransferase 2 protects from asymmetric dimethylarginine-induced endothelial dysfunction and aortic remodeling. Sci Rep 2022; 12:9381. [PMID: 35672381 PMCID: PMC9174227 DOI: 10.1038/s41598-022-13169-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 05/20/2022] [Indexed: 12/03/2022] Open
Abstract
Elevated plasma concentrations of asymmetric dimethylarginine (ADMA) are associated with an increased risk of mortality and adverse cardiovascular outcomes. ADMA can be metabolized by dimethylarginine dimethylaminohydrolases (DDAHs) and by alanine-glyoxylate aminotransferase 2 (AGXT2). Deletion of DDAH1 in mice leads to elevation of ADMA in plasma and increase in blood pressure, while overexpression of human DDAH1 is associated with a lower plasma ADMA concentration and protective cardiovascular effects. The possible role of alternative metabolism of ADMA by AGXT2 remains to be elucidated. The goal of the current study was to test the hypothesis that transgenic overexpression of AGXT2 leads to lowering of plasma levels of ADMA and protection from vascular damage in the setting of DDAH1 deficiency. We generated transgenic mice (TG) with ubiquitous overexpression of AGXT2. qPCR and Western Blot confirmed the expression of the transgene. Systemic ADMA levels were decreased by 15% in TG mice. In comparison with wild type animals plasma levels of asymmetric dimethylguanidino valeric acid (ADGV), the AGXT2 associated metabolite of ADMA, were six times higher. We crossed AGXT2 TG mice with DDAH1 knockout mice and observed that upregulation of AGXT2 lowers plasma ADMA and pulse pressure and protects the mice from endothelial dysfunction and adverse aortic remodeling. Upregulation of AGXT2 led to lowering of ADMA levels and protection from ADMA-induced vascular damage in the setting of DDAH1 deficiency. This is especially important, because all the efforts to develop pharmacological ADMA-lowering interventions by means of upregulation of DDAHs have been unsuccessful.
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Porro B, Eligini S, Conte E, Cosentino N, Capra N, Cavalca V, Banfi C. An Optimized MRM-Based Workflow of the l-Arginine/Nitric Oxide Pathway Metabolites Revealed Disease- and Sex-Related Differences in the Cardiovascular Field. Int J Mol Sci 2022; 23:ijms23031136. [PMID: 35163055 PMCID: PMC8835333 DOI: 10.3390/ijms23031136] [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: 01/03/2022] [Revised: 01/17/2022] [Accepted: 01/19/2022] [Indexed: 11/29/2022] Open
Abstract
Clinical data indicate that low circulating l-homoarginine (HArg) concentrations are associated with cardiovascular (CV) disease, CV mortality, and all-cause mortality. A high number of LC-based analytical methods for the quantification of HArg, in combination with the l-arginine (Arg)-related pathway metabolites, have been reported. However, these methods usually consider a limited panel of analytes. Thus, in order to achieve a comprehensive picture of the Arg metabolism, we described an improved targeted metabolomic approach based on a multiple reaction monitoring (MRM) mass spectrometry method for the simultaneous quantification of the Arg/nitric oxide (NO) pathway metabolites. This methodology was then employed to quantify the plasma concentrations of these analytes in a cohort of individuals with different grades/types of coronary artery disease (CAD) in order to increase knowledge about the role of HArg and its associated metabolites in the CV field. Our results showed that the MRM method here implemented is suitable for the simultaneous assessment of a wide panel of amino acids involved in the Arg/NO metabolic pathway in plasma samples from patients with CV disease. Further, our findings highlighted an impairment of the Arg/NO metabolic pathway, and suggest a sex-dependent regulation of this metabolic route.
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Eryavuz Onmaz D, Abusoglu S, Yaglioglu H, Abusoglu G, Unlu A. Developing a robust, fast and reliable measurement method for the analysis of methylarginine derivatives and related metabolites. J Mass Spectrom Adv Clin Lab 2021; 19:34-45. [PMID: 34820664 PMCID: PMC8601011 DOI: 10.1016/j.jmsacl.2021.02.002] [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: 08/09/2020] [Revised: 02/17/2021] [Accepted: 02/19/2021] [Indexed: 11/21/2022] Open
Abstract
Background Nitric oxide (NO) plays an important role in endothelial homeostasis. Asymmetric dimethyl arginine (ADMA), L-N monomethyl arginine (L-NMMA) and symmetric dimethyl arginine (SDMA), which are derivatives of methylarginine, directly or indirectly reduce NO production. Therefore, these metabolites are an important risk factor for various diseases, including cardiovascular diseases. Numerous methods have been developed for the measurement of methylarginine derivatives, but various difficulties have been encountered. This study aimed to develop a reliable, fast and cost-effective method for the analysis and measurement of methylarginine derivatives (ADMA, SDMA, L-NMMA) and related metabolites (arginine, citrulline, homoarginine, ornithine), and to validate this method according to Clinical and Laboratory Standards Institute (CLSI) protocols. Methods For the analysis of ADMA, SDMA, L-NMMA, arginine, homoarginine, citrulline, ornithine, 200 µl of serum were precipitated with methanol, and subsequently derivatized with a butanol solution containing 5% acetyl chloride. Butyl derivatives were separated using a C18 reverse phase column with a 5 min run time. Detection of analytes was achieved by utilising the specific fragmentation patterns identified through tandem mass spectrometry. Results The method was linear for ADMA, SDMA, L-NMMA, ornithine, arginine, homoarginine and citrulline in the ranges of 0.023–6.0, 0.021–5.5, 0.019–5.0, 0.015–250, 0.015–250, 0.019–5 and 0.015–250 µM, respectively. The inter-assay CV% values for all analytes was less than 9.8%. Conclusions Data obtained from method validation studies shows that the developed method is highly sensitive, precise and accurate. Short analysis time, cost-effectiveness, and multiplexed analysis of these metabolites, with the same pretreatment steps, are the main advantages of the method.
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Key Words
- ADMA
- ADMA, asymmetric dimethyl arginine
- CE, capillary electrophoresis
- CE, collision energy
- CLSI, The Clinical & Laboratory Standards Institute
- CXP, collision cell exit potential
- DDAH, dimethylaminohydrolase
- DP, declustering potential
- EP, enterance potential
- FDA, Food and Drug Administration
- GC–MS, gas chromatography–mass spectrometry
- HPLC, high performance liquid chromatography
- L-NMMA, L-N monomethyl arginine
- LC-MS, liquid chromatography–mass spectrometry
- LC-MS/MS, liquid chromatography tandem-mass spectrometry
- MRM, multiple reaction monitoring
- Methylarginines
- NO, nitric oxide
- NOS, nitric oxide synthase
- PRMTs, protein arginine methyltransferases
- SDMA, symmetric dimethyl arginine
- Tandem mass spectrometry
- Validation
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Affiliation(s)
- Duygu Eryavuz Onmaz
- Department of Biochemistry, Selcuk University Faculty of Medicine, Konya, Turkey
| | - Sedat Abusoglu
- Department of Biochemistry, Selcuk University Faculty of Medicine, Konya, Turkey
| | - Havva Yaglioglu
- Department of Biochemistry, Selcuk University Faculty of Medicine, Konya, Turkey
| | - Gulsum Abusoglu
- Department of Medical Laboratory Techniques, Selcuk University Vocational School of Health, Konya, Turkey
| | - Ali Unlu
- Department of Biochemistry, Selcuk University Faculty of Medicine, Konya, Turkey
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Kopaliani I, Jarzebska N, Billoff S, Kolouschek A, Martens-Lobenhoffer J, Bornstein SR, Bode-Böger SM, Ragavan VN, Weiss N, Mangoni AA, Deussen A, Rodionov RN. Overexpression of dimethylarginine dimethylaminohydrolase 1 protects from angiotensin II-induced cardiac hypertrophy and vascular remodeling. Am J Physiol Heart Circ Physiol 2021; 321:H825-H838. [PMID: 34533401 DOI: 10.1152/ajpheart.00064.2021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 09/01/2021] [Indexed: 11/22/2022]
Abstract
Cardiovascular complications are the leading cause of death, and elevated levels of asymmetric dimethyarginine (ADMA), an endogenous inhibitor of nitric oxide synthase, are implicated in their pathophysiology. We investigated the role of dimethylarginine dimethylaminohydrolase 1 (DDAH1), an enzyme hydrolyzing ADMA, in prevention of cardiovascular remodeling during hypertension. We hypothesized that the animals overexpressing DDAH1 will be protected from angiotensin II (ANG II)-induced end organ damage. Angiotensin II (ANG II) was infused in two doses: 0.75 and 1.5 mg/kg/day in DDAH1 transgenic mice (DDAH1 TG) and wild-type (WT) littermates for 2 or 4 wk. Echocardiography was performed in the first and fourth weeks of the infusion, systolic blood pressure (SBP) was measured weekly, and cardiac hypertrophy and vascular remodeling was assessed by histology. Increase in SBP after 1 wk of ANG II infusion was not different between the groups, whereas TG mice had lower SBP at later time points. TG mice were protected from cardiovascular remodeling after 2 wk of ANG II infusion in the high dose and after 4 wk in the moderate dose. TG mice had higher left ventricular lumen-to-wall ratio, lower cardiomyocyte cross-sectional area, and less interstitial fibrosis compared with WT controls. In aorta, TG mice had less adventitial fibrosis, lower medial thickness with preserved elastin content, lower counts of inflammatory cells, lower levels of active matrix metalloproteinase-2, and showed better endothelium-dependent relaxation. We demonstrated that overexpression of DDAH1 protects from ANG II-induced cardiovascular remodeling and progression of hypertension by preserving endothelial function and limiting inflammation.NEW & NOTEWORTHY We showed that overexpression of dimethylarginine dimethylaminohydrolase 1 (DDAH1) protects from angiotensin II-induced cardiovascular damage, progression of hypertension, and adverse vascular remodeling in vivo. This protective effect is associated with decreased levels of asymmetric dimethylarginine, preservation of endothelial function, inhibition of cardiovascular inflammation, and lower activity of matrix metalloproteinase-2. Our findings are highly clinically relevant, because they suggest that upregulation of DDAH1 might be a promising therapeutic approach against angiotensin II-induced end organ damage.
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Affiliation(s)
- Irakli Kopaliani
- Department of Physiology, Medical Faculty, Dresden University of Technology, Dresden, Germany
| | - Natalia Jarzebska
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
- Department of Anesthesiology and Critical Care Medicine, University Hospital Dresden, Dresden University of Technology, Dresden, Germany
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Silke Billoff
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
| | - Anne Kolouschek
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
| | | | - Stefan R Bornstein
- University Clinic and Polyclinic III, Dresden University of Technology, Dresden, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Magdeburg, Germany
| | - Vinitha N Ragavan
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
- Department of Clinical Pharmacology, College of Medicine and Public Health, Flinders University and Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Norbert Weiss
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
- University Clinic and Polyclinic III, Dresden University of Technology, Dresden, Germany
| | - Arduino A Mangoni
- Department of Clinical Pharmacology, College of Medicine and Public Health, Flinders University and Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Andreas Deussen
- Department of Physiology, Medical Faculty, Dresden University of Technology, Dresden, Germany
| | - Roman N Rodionov
- University Center for Vascular Medicine, Dresden University of Technology, Dresden, Germany
- University Clinic and Polyclinic III, Dresden University of Technology, Dresden, Germany
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7
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Homoarginine and methylarginines independently predict long-term outcome in patients presenting with suspicion of venous thromboembolism. Sci Rep 2021; 11:9569. [PMID: 33953241 PMCID: PMC8100302 DOI: 10.1038/s41598-021-88986-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/12/2021] [Indexed: 11/09/2022] Open
Abstract
Endogenous arginine derivatives homoarginine, asymmetric dimethylarginine (ADMA) and symmetric dimethyarginine (SDMA) are independent mortality predictors in atherosclerotic cardiovascular disease (CVD). Our study reports the first analysis, whether homoarginine, ADMA and SDMA predict venous thromboembolism (VTE) recurrence and overall mortality in patients with suspected acute VTE. We assessed serum levels of homoarginine, ADMA and SDMA by LC-MS/MS in 865 individuals from a prospective consecutive cohort of patients with clinical suspicion of VTE. The median follow-up time for mortality was 1196 days. VTE was confirmed by imaging in 418 patients and excluded in 447 patients. Low levels of homoarginine and high levels of ADMA or SDMA independently predicted all-cause mortality after adjustment for sex, age, oral anticoagulants, body mass index, arterial hypertension, diabetes mellitus, smoking, dyslipidemia, chronic heart failure, history of stroke, creatinine and cancer both in patients with VTE and without VTE. Interestingly, none of those parameters was predictive for VTE recurrence. We provide the first report that low circulating levels of homoarginine and high circulating levels of ADMA and SDMA independently predict all-cause mortality in patients with suspected VTE. These parameters might serve as markers of "frailty" and should be considered for future risk stratification approaches in this clinical population. Taking into account that homoarginine supplementation is protective in animal models of CVD and safe in healthy human volunteers, our study provides the basis for future homoarginine supplementation studies in patients with suspected VTE to investigate possible direct protective effects of homoarginine in this population.
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Liu C, Li R, Liu Y, Li Z, Sun Y, Yin P, Huang R. Characteristics of Blood Metabolic Profile in Coronary Heart Disease, Dilated Cardiomyopathy and Valvular Heart Disease Induced Heart Failure. Front Cardiovasc Med 2021; 7:622236. [PMID: 33553267 PMCID: PMC7856915 DOI: 10.3389/fcvm.2020.622236] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/23/2020] [Indexed: 12/13/2022] Open
Abstract
Purpose: Metabolic impairment is one key contributor to heart failure (HF) pathogenesis and progression. The major causes of HF, coronary heart disease (CHD), dilated cardiomyopathy (DCM), and valvular heart disease (VHD) remains poorly characterized in patients with HF from the view of metabolic profile. We sought to determine metabolic differences in CHD-, VHD-, and DCM-induced HF patients and identify significantly altered metabolites and their correlations. Procedure: In this study, a total of 96 HF cases and 97 controls were enrolled. The contents of 23 amino acids and 26 carnitines in fasting plasma were measured by a targeted liquid chromatography and mass spectrometry (LC-MS) approach. Results: Nine metabolites (Histidine, Arginine, Citrulline, Glutamine, Valine, hydroxyhexadecenyl-carnitine, acylcarnitine C22, hydroxytetradecanoyl-carnitine, and carnitine) were found to be related with the occurrence of HF. Arginine, Glutamine and hydroxytetradecanoyl-carnitine could effectively distinguish CHD and DCM patients, and hydroxytetradecanoyl-carnitine and aspartic acid were able to classify CHD and VHD cohorts. Conclusion: This study indicated that circulating amino acids and long-chain acylcarnitine levels were closely associated with progression of heart failure. Monitoring these metabolic alterations by LC-MS may help the differentiation of CHD, VHD, and DCM in the early stage, and provide new diagnostics targets or therapeutic interventions.
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Affiliation(s)
- Chang Liu
- First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Ruihua Li
- Medical Laboratory Science, Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yang Liu
- First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhenguo Li
- Medical Laboratory Science, Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yujiao Sun
- First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Peiyuan Yin
- First Affiliated Hospital of Dalian Medical University, Dalian, China.,College of Integrative Medicine, Dalian Medical University, Dalian, China
| | - Rihong Huang
- First Affiliated Hospital of Dalian Medical University, Dalian, China
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9
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Putzer AS, Worthmann H, Grosse GM, Goetz F, Martens-Lobenhoffer J, Dirks M, Kielstein JT, Lichtinghagen R, Budde U, Bode-Böger SM, Weissenborn K, Schuppner R. ADAMTS13 activity is associated with early neurological improvement in acute ischemic stroke patients treated with intravenous thrombolysis. J Thromb Thrombolysis 2020; 49:67-74. [PMID: 31482326 DOI: 10.1007/s11239-019-01941-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Although intravenous thrombolysis (IVT) with recombinant tissue-plasminogen-activator represents a highly effective treatment in acute ischemic stroke patients, not every patient benefits. We hypothesized that pretreatment levels of mediators of hemostasis (VWF and ADAMTS13) and dimethylarginines (ADMA and SDMA) are associated with early neurological improvement and outcome after IVT in ischemic stroke. Moreover we aimed to investigate the link between ADAMTS13 and markers of inflammation (CRP, IL-6, MMP-9 and MCP-1). In 43 patients with acute ischemic stroke treated with IVT blood samples for determination of the different markers were strictly taken before treatment, as well as at 24 h, 3, 7 and 90 days after symptom onset. Early neurological improvement was assessed using the shift between National Institutes of Health Stroke Scale (NIHSS) at baseline and at 24 h. Outcome at 90 days was assessed using the modified Rankin Scale. The lowest quartile of ADAMTS13 activity was independently associated with less improvement in NIHSS (baseline-24 h) (OR 1.298, p = 0.050). No independent association of ADMA or SDMA levels at baseline with outcome could be shown. Furthermore, IL-6, MCP-1 and CRP levels at 90 days significantly differed between patients with low and high ADAMTS13 activity. Thus, ADAMTS13 might indicate or even influence efficacy of IVT.
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Affiliation(s)
- Anne-Sophie Putzer
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany
| | - Hans Worthmann
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany
| | - Gerrit M Grosse
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany
| | - Friedrich Goetz
- Institute of Diagnostic and Interventional Neuroradiology, Hannover Medical School, 30625, Hannover, Germany
| | - Jens Martens-Lobenhoffer
- Department of Clinical Pharmacology, Otto-Guericke-University of Magdeburg, University Hospital, 39106, Magdeburg, Germany
| | - Meike Dirks
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany
| | - Jan T Kielstein
- Medical Clinic V, Academic Teaching Hospital Braunschweig, 38118, Brunswick, Germany
| | - Ralf Lichtinghagen
- Department of Clinical Chemistry, Hannover Medical School, 30625, Hannover, Germany
| | - Ulrich Budde
- Medilys Laboratory, Asklepios Klinik Altona, 22763, Hamburg, Germany
| | - Stefanie M Bode-Böger
- Department of Clinical Pharmacology, Otto-Guericke-University of Magdeburg, University Hospital, 39106, Magdeburg, Germany
| | - Karin Weissenborn
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany
| | - Ramona Schuppner
- Department of Neurology, Hannover Medical School, 30625, Hannover, Germany.
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10
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Stautemas J, Jarzebska N, Shan ZX, Blancquaert L, Everaert I, de Jager S, De Baere S, Hautekiet A, Volkaert A, Lefevere FBD, Martens-Lobenhoffer J, Bode-Böger SM, Kim CK, Leiper J, Weiss N, Croubels S, Rodionov RN, Derave W. The role of alanine glyoxylate transaminase-2 (agxt2) in β-alanine and carnosine metabolism of healthy mice and humans. Eur J Appl Physiol 2020; 120:2749-2759. [PMID: 32948897 DOI: 10.1007/s00421-020-04501-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 09/10/2020] [Indexed: 12/17/2022]
Abstract
PURPOSE Chronic β-alanine supplementation leads to increased levels of muscle histidine-containing dipeptides. However, the majority of ingested β-alanine is, most likely, degraded by two transaminases: GABA-T and AGXT2. In contrast to GABA-T, the in vivo role of AGXT2 with respect to β-alanine metabolism is unknown. The purpose of the present work is to investigate if AGXT2 is functionally involved in β-alanine homeostasis. METHODS Muscle histidine-containing dipeptides levels were determined in AGXT2 overexpressing or knock-out mice and in human subjects with different rs37369 genotypes which is known to affect AGXT2 activity. Further, plasma β-alanine kinetic was measured and urine was obtained from subjects with different rs37369 genotypes following ingestion of 1400 mg β-alanine. RESULT Overexpression of AGXT2 decreased circulating and muscle histidine-containing dipeptides (> 70% decrease; p < 0.05), while AGXT2 KO did not result in altered histidine-containing dipeptides levels. In both models, β-alanine remained unaffected in the circulation and in muscle (p > 0.05). In humans, the results support the evidence that decreased AGXT2 activity is not associated with altered histidine-containing dipeptides levels (p > 0.05). Additionally, following an acute dose of β-alanine, no differences in pharmacokinetic response were measured between subjects with different rs37369 genotypes (p > 0.05). Interestingly, urinary β-alanine excretion was 103% higher in subjects associated with lower AGXT2 activity, compared to subjects associated with normal AGXT2 activity (p < 0.05). CONCLUSION The data suggest that in vivo, β-alanine is a substrate of AGXT2; however, its importance in the metabolism of β-alanine and histidine-containing dipeptides seems small.
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Affiliation(s)
- Jan Stautemas
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium.
| | - Natalia Jarzebska
- University Centre for Vascular Medicine and Department of Internal Medicine, Technische Universität Dresden, Dresden, Germany.,Department of Anaesthesiology and Intensive Care Medicine, Pulmonary Engineering Group, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Zhou Xiang Shan
- Anhui Institute of Sport Science and Technology, Anhui University of Science and Technology Anhui, Anhui, China
| | - Laura Blancquaert
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
| | - Inge Everaert
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
| | - Sarah de Jager
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
| | - Siegrid De Baere
- Department of Pharmacology, Toxicology and Biochemistry, Ghent University, Ghent, Belgium
| | - Arne Hautekiet
- Department of Physical Medicine and Rehabilitation, Ghent University Hospital, Ghent, Belgium
| | - Anneke Volkaert
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
| | - Filip B D Lefevere
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
| | | | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-Von-Guericke University, Magdeburg, Germany
| | - Chang Keun Kim
- Exercise and Metabolism Research Center, Zhejiang Normal University, Jinhua, China
| | - James Leiper
- MRC London Institute of Medical Sciences, Hammersmith Hospital Campus, London, UK
| | - Norbert Weiss
- University Centre for Vascular Medicine and Department of Internal Medicine, Technische Universität Dresden, Dresden, Germany
| | - Siska Croubels
- Department of Pharmacology, Toxicology and Biochemistry, Ghent University, Ghent, Belgium
| | - Roman N Rodionov
- University Centre for Vascular Medicine and Department of Internal Medicine, Technische Universität Dresden, Dresden, Germany
| | - Wim Derave
- Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Gent, Belgium
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11
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Rodionov RN, Jarzebska N, Schneider A, Rexin A, Sradnick J, Brilloff S, Martens-Lobenhoffer J, Bode-Böger SM, Todorov V, Hugo C, Weiss N, Hohenstein B. ADMA elevation does not exacerbate development of diabetic nephropathy in mice with streptozotocin-induced diabetes mellitus. ATHEROSCLEROSIS SUPP 2020; 40:100-105. [PMID: 31818438 DOI: 10.1016/j.atherosclerosissup.2019.08.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Cardiovascular disease is nowadays the major cause of mortality and morbidity worldwide. The risk of developing cardiovascular disease is significantly increased in patients with diabetic nephropathy. It has been suggested that asymmetric dimethylarginine (ADMA), an endogenous inhibitor of NO synthases (NOS), may play an important role in the pathogenesis of diabetic nephropathy. ADMA is mainly metabolized by dimethylarginine dimethylaminohydrolase 1 (DDAH1). The goal of this study was to test the hypothesis that elevation of systemic ADMA levels by knocking out DDAH1 would exacerbate functional and structural glomerular abnormalities in a murine model of diabetic nephropathy. METHODS Streptozotocin (STZ) was used to induce diabetes in adult DDAH1 knock-out and wild type mice. Healthy mice served as controls. Mice were sacrificed after 20 weeks of diabetes. Plasma ADMA levels were assessed by isotope-dilution tandem mass spectrometry and albumin by ELISA. Kidneys were used for FACS analysis and were also stained for markers of inflammation, cell proliferation, glomerular cells and cell matrix. RESULTS STZ led to development of diabetes mellitus in all injected animals. Deficiency of DDAH1 led to a significant increase in plasma ADMA levels in healthy and diabetic mice. The diabetic state itself did not influence systemic ADMA levels. Diabetic mice of both genotypes developed albuminuria and had increased glomerulosclerosis index. There were no changes in desmin expression, glomerular cell proliferation rate, matrix expansion and expression of Mac-2 antigen in the diabetic mice of both genotypes as compared to the healthy ones. CONCLUSIONS In summary, STZ-induced diabetes led to the development of early features of diabetic nephropathy. Deficiency of DDAH1 and subsequent increase in systemic ADMA levels did not exacerbate these changes, indicating that ADMA is not the major mediator of diabetic nephropathy in this experiment model.
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Affiliation(s)
- Roman N Rodionov
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany.
| | - Natalia Jarzebska
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany; Department of Anesthesiology and Critical Care Medicine, University Hospital Dresden, Technische Universität Dresden, Germany
| | - Alfred Schneider
- Department of Visceral Surgery, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Annett Rexin
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Silke Brilloff
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Jens Martens-Lobenhoffer
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Str.44, 39120, Magdeburg, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Str.44, 39120, Magdeburg, Germany
| | - Vladimir Todorov
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Christian Hugo
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Norbert Weiss
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
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12
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Roggensack T, Merz B, Dick N, Bub A, Krüger R. Targeted ultra-performance liquid chromatography/tandem mass spectrometric quantification of methylated amines and selected amino acids in biofluids. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8646. [PMID: 31674086 DOI: 10.1002/rcm.8646] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 10/23/2019] [Accepted: 10/27/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Methylated amino compounds and basic amino acids are important analyte classes with high relevance in nutrition, physical activity and physiology. Reliable and easy quantification methods covering a variety of metabolites in body fluids are a prerequisite for efficient investigations in the field of food and nutrition. METHODS Targeted ultra-performance liquid chromatography/tandem mass spectrometric (UHPLC/MS) analysis was performed using HILIC separation and timed ESI-MRM detection, combined with a short sample preparation. Calibration in urine and blood plasma was achieved by matrix-matched standards, isotope-labelled internal standards and standard addition. The method was fully validated and the performance was evaluated using a subset from the Karlsruhe Metabolomics and Nutrition (KarMeN) study. RESULTS Within this method, a total of 30 compounds could be quantified simultaneously in a short run of 9 min in both body fluids. This covers a variety of free amino compounds which are present in very different concentrations. The method is easy, precise and robust, and has a broad working range. As a proof of principle, literature-based associations of certain metabolites with dietary intake of respective foods were clearly confirmed in the KarMeN subset. CONCLUSIONS Overall, the method turned out to be well suited for application in nutrition studies, as shown for the example of food intake biomarkers in KarMeN. Application to a variety of questions such as food-related effects or physical activity will support future studies in the context of nutrition and health.
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Affiliation(s)
- Tim Roggensack
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Karlsruhe, Germany
| | - Benedikt Merz
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Karlsruhe, Germany
| | - Niels Dick
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Karlsruhe, Germany
| | - Achim Bub
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Karlsruhe, Germany
| | - Ralf Krüger
- Department of Physiology and Biochemistry of Nutrition, Max Rubner-Institut, Karlsruhe, Germany
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13
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An Ethnic Comparison of Arginine Dimethylation and Cardiometabolic Factors in Healthy Black and White Youth: The ASOS and African-PREDICT Studies. J Clin Med 2020; 9:jcm9030844. [PMID: 32244968 PMCID: PMC7141317 DOI: 10.3390/jcm9030844] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/12/2020] [Accepted: 03/18/2020] [Indexed: 12/20/2022] Open
Abstract
Proteinic arginine dimethylation (PADiMe) is a major post-translational modification. Proteolysis of asymmetric and symmetric PADiMe products releases asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA), respectively, two endogenous atherogenic substances. SDMA, ADMA, and its major metabolite dimethylamine (DMA) are eliminated by the kidney. The urinary concentrations of DMA+ADMA, SDMA, and DMA+ADMA+SDMA are useful measures of the whole-body asymmetric and symmetric PADiMe, respectively. Urinary (DMA+ADMA)/SDMA is an index of the asymmetric to symmetric PADiMe balance. In two bi-ethnic studies, the ASOS (39 black boys, 41 white boys) and the African-PREDICT (292 black young men, 281 white young men) studies, we investigated whether ethnicity is a major determinant of PADiMe, and whether PADiMe is associated with blood pressure and ethnicity-dependent growth and inflammatory factors, including HDL. DMA, ADMA, and SDMA were measured in spot urine samples by gas chromatography-mass spectrometry, and their excretion was corrected for creatinine excretion. In black boys, creatinine-corrected DMA, DMA+ADMA, and DMA+ADMA+SDMA concentrations were lower by 11.7%, 9.5%, and 7.6% (all p < 0.05), respectively, compared to the white boys, and 3.4%, 2.0%, and 1.8% lower (all p < 0.05), respectively, in black compared to white men. (DMA+ADMA)/SDMA did not differ between black boys and black men, but was higher in white boys compared to white men. ADMA did not differ between black and white boys, or between black and white men. Creatinine-corrected SDMA excretion was lower in black boys compared to white boys (by 8%) and to white men (by 3.1%). None of the PADiMe indices were associated with blood pressure in either study. IGF-binding protein 3 correlated inversely with all PADiMe indices in the black men only. Our study showed that asymmetric proteinic arginine dimethylation is higher in white boys than in black boys, and that this difference disappears in adulthood. ADMA metabolism and SDMA excretion were lower in the black subjects compared to the white subjects, suggesting ethnicity-dependent hepatic and renal elimination of ADMA and SDMA in the childhood. The results of our study may have clinical relevance beyond atherosclerosis, such as in growth and inflammation, which have not been sufficiently addressed thus far.
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14
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Ziegler NL, Sieweke JT, Biber S, Gabriel MM, Schuppner R, Worthmann H, Martens-Lobenhoffer J, Lichtinghagen R, Bode-Böger SM, Bavendiek U, Weissenborn K, Grosse GM. Markers of endothelial pathology to support detection of atrial fibrillation in embolic stroke of undetermined source. Sci Rep 2019; 9:19424. [PMID: 31857660 PMCID: PMC6923420 DOI: 10.1038/s41598-019-55943-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/04/2019] [Indexed: 12/17/2022] Open
Abstract
A relevant part of embolic strokes of undetermined source (ESUS) is assumed to be cardiogenic. As shown previously, certain biomarkers of endothelial pathology are related to atrial fibrillation (AF). In this long-term follow-up study, we aimed to investigate whether these biomarkers are associated with subsequently diagnosed AF and with atrial cardiopathy. In 98 patients who suffered ischemic stroke of known and unknown origin L-arginine, Asymmetric (ADMA) and Symmetric Dimethylarginine (SDMA) have been measured on follow-up at least one year after index stroke. Stroke-diagnostics were available for all patients, including carotid Intima-Media-Thickness (CIMT) and comprehensive echocardiography studies. CIMT was larger in AF- compared with ESUS-patients (P < 0.001), independently from CHA2DS2VASC in the regression analysis (P = 0.004). SDMA-values were stable over time (P < 0.001; r = 0.788), whereas for ADMA moderate correlation with the initial values could be found (P = 0.007; r = 0.356). According to Kaplan-Meier-analyses, AF-detection rates were associated with CIMT (P = 0.003) and SDMA (P < 0.001). SDMA correlated with left atrial volume-index within the whole collective (P = 0.003, r = 0.322) and within the ESUS-subgroup (P = 0.003; r = 0.446). These associations were independent from CHA2DS2VASC and renal function in the regression analysis (P = 0.02 and P = 0.005, respectively). In conclusion, these results highlight SDMA and CIMT as potential markers of atrial cardiopathy and AF in ESUS-patients.
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Affiliation(s)
- Nora L Ziegler
- Department of Neurology, Hannover Medical School, Hannover, Germany
| | - Jan-Thorben Sieweke
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Saskia Biber
- Department of Neurology, Hannover Medical School, Hannover, Germany
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Maria M Gabriel
- Department of Neurology, Hannover Medical School, Hannover, Germany
| | - Ramona Schuppner
- Department of Neurology, Hannover Medical School, Hannover, Germany
| | - Hans Worthmann
- Department of Neurology, Hannover Medical School, Hannover, Germany
| | | | - Ralf Lichtinghagen
- Institute of Clinical Chemistry, Hannover Medical School, Hannover, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Udo Bavendiek
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | | | - Gerrit M Grosse
- Department of Neurology, Hannover Medical School, Hannover, Germany.
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15
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Rodionov RN, Begmatov H, Jarzebska N, Patel K, Mills MT, Ghani Z, Khakshour D, Tamboli P, Patel MN, Abdalla M, Assaf M, Bornstein SR, Millan JL, Bode-Böger SM, Martens-Lobenhoffer J, Weiss N, Savinova OV. Homoarginine Supplementation Prevents Left Ventricular Dilatation and Preserves Systolic Function in a Model of Coronary Artery Disease. J Am Heart Assoc 2019; 8:e012486. [PMID: 31304837 PMCID: PMC6662144 DOI: 10.1161/jaha.119.012486] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Background Homoarginine (hArg) has been shown to be cardioprotective in a model of ischemic heart failure; however, the mechanism remains unknown. hArg can inhibit tissue‐nonspecific alkaline phosphatase (TNAP), an enzyme that promotes vascular calcification. We hypothesized that hArg will exert beneficial effects by reducing calcification in a mouse model of coronary artery disease associated with TNAP overexpression and hypercholesterolemia. Methods and Results TNAP was overexpressed in the endothelium in mice homozygous for a low‐density lipoprotein receptor mutation (wicked high cholesterol [WHC] allele). WHC and WHC–endothelial TNAP mice received placebo or hArg supplementation (14 mg/L in drinking water) starting at 6 weeks of age simultaneously with an atherogenic diet. Outcomes were compared between the groups after 4 to 5 weeks on treatment. Experiments were performed in males, which presented a study limitation. As expected, WHC–endothelial TNAP mice on the placebo had increased mortality (median survival 27 days, P<0.0001), increased coronary calcium and lipids (P<0.01), increased left ventricular end‐diastolic diameter (P<0.0001), reduced ejection fraction (P<0.05), and increased myocardial fibrosis (P<0.0001) compared with WHC mice. Contrary to our hypothesis, hArg neither inhibited TNAP activity in vivo nor reduced coronary artery calcification and atherosclerosis in WHC–endothelial TNAP mice; however, compared with the placebo, hArg prevented left ventricular dilatation (P<0.01), preserved ejection fraction (P<0.05), and reduced myocardial fibrosis (P<0.001). Conclusions The beneficial effect of hArg supplementation in the setting of calcified coronary artery disease is likely due to its direct protective actions on the myocardial response to the ischemic injury and not to the inhibition of TNAP activity and calcification.
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Affiliation(s)
- Roman N Rodionov
- 1 University Center for Vascular Medicine Technische Universität Dresden Dresden Germany
| | - Hoshimjon Begmatov
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Natalia Jarzebska
- 1 University Center for Vascular Medicine Technische Universität Dresden Dresden Germany.,3 Department of Anesthesiology and Intensive Care Unit Medicine Pulmonary Engineering Group University Hospital Carl Gustav Carus Technische Universität Dresden Dresden Germany
| | - Ketul Patel
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Matthew T Mills
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Zulaikha Ghani
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Doreen Khakshour
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Pankti Tamboli
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Mitul N Patel
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Mirette Abdalla
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Maryann Assaf
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
| | - Stefan R Bornstein
- 4 Department of Internal Medicine III University Hospital Carl Gustav Carus Technische Universität Dresden Dresden Germany
| | - Jose Luis Millan
- 5 Human Genetics Program Sanford Burnham Prebys Medical Discovery Institute La Jolla CA
| | | | | | - Norbert Weiss
- 1 University Center for Vascular Medicine Technische Universität Dresden Dresden Germany
| | - Olga V Savinova
- 2 Department of Biomedical Sciences New York Institute of Technology College of Osteopathic Medicine Old Westbury NY
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16
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Németh B, Péter I, Boncz I, Jagicza A, Kiss I, Csergő Á, Kőszegi T, Kustán P, Horváth IG, Ajtay Z. Urinary orosomucoid: a new marker of cardiovascular risk in psoriatic patients? Ther Clin Risk Manag 2019; 15:831-837. [PMID: 31308681 PMCID: PMC6616299 DOI: 10.2147/tcrm.s197633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 04/25/2019] [Indexed: 12/21/2022] Open
Abstract
Purpose Psoriasis is one of the most common lifelong lasting dermatologic diseases. According to the latest studies, psoriatic patients have a higher risk of developing cardiovascular diseases. Psoriasis is considered as a systemic inflammatory disease. Several oxidative stress markers have been shown to be elevated in psoriasis. However, a panel of biomarkers has not been used yet. This study was aimed at exploring the connection between a panel of biomarkers (C-reactive protein, asymmetric dimethylarginine, uric acid, total antioxidant capacity, malondialdehyde, and orosomucoid [ORM]) and cardiovascular risk in psoriatic patients. Patients and methods The inclusion criterion was the onset of psoriasis with skin lesions. Exclusion criteria were impaired renal function (eGFR<60 mL/min/1.73 m2), acute inflammations (urinary, respiratory, skin inflammation, etc), autoimmune disorders (rheumatoid arthritis, systemic lupus erythematosus, or inflammatory bowel disease), and any kind of biological antipsoriatic treatment. Patients with a medical history of myocardial infarction, coronary heart disease, stroke, transient ischemic attack, and carotid artery stenosis were also excluded. Biomarkers were measured by routine procedures, ELISA and HPLC. QRISK®2-2017 was used to assess 10-year risk of cardiovascular disease development. Psoriasis severity was measured by the Psoriasis Area and Severity Index. Results One hundred and fourteen psoriatic patients were enrolled. Only urinary orosomucoid and urinary orosomucoid/urinary creatinine (u-ORM/u-CREAT) ratio showed significant correlation with QRISK score (u-ORM, r=0.245; u-ORM/u-CREAT, r=0.309). When comparing mild psoriatic patients to moderate psoriatic patients, significant differences could only be found in u-ORM and u-ORM/u-CREAT ratio. Conclusion There seems to be a connection between urinary ORM and cardiovascular risk. U-ORM and u-ORM/u-CREAT ratio could be used as an indicator of low-grade inflammation in mild and moderate psoriasis. However, it is the 10-year follow-up of cardiovascular events that will determine the usefulness of this biomarker panel.
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Affiliation(s)
- Balázs Németh
- Dermatology Unit, Zsigmondy Vilmos SPA Hospital, Harkány, Hungary.,Department of Public Health Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Iván Péter
- Dermatology Unit, Zsigmondy Vilmos SPA Hospital, Harkány, Hungary
| | - Imre Boncz
- Dermatology Unit, Zsigmondy Vilmos SPA Hospital, Harkány, Hungary
| | - Anna Jagicza
- Dermatology Unit, Zsigmondy Vilmos SPA Hospital, Harkány, Hungary
| | - István Kiss
- Department of Public Health Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Ágnes Csergő
- Department of Public Health Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Tamás Kőszegi
- Department of Laboratory Medicine, Medical School, University of Pécs, Pécs, Hungary.,János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Péter Kustán
- Department of Laboratory Medicine, Medical School, University of Pécs, Pécs, Hungary.,János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Iván G Horváth
- Heart Institute, Medical School, University of Pécs, Pécs, Hungary
| | - Zénó Ajtay
- Dermatology Unit, Zsigmondy Vilmos SPA Hospital, Harkány, Hungary.,Heart Institute, Medical School, University of Pécs, Pécs, Hungary
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17
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Grosse GM, Biber S, Sieweke JT, Martens-Lobenhoffer J, Gabriel MM, Putzer AS, Hasse I, van Gemmeren T, Schuppner R, Worthmann H, Lichtinghagen R, Bode-Böger SM, Bavendiek U, Weissenborn K. Plasma Dimethylarginine Levels and Carotid Intima-Media Thickness are related to Atrial Fibrillation in Patients with Embolic Stroke. Int J Mol Sci 2019; 20:ijms20030730. [PMID: 30744089 PMCID: PMC6387438 DOI: 10.3390/ijms20030730] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/04/2019] [Accepted: 02/07/2019] [Indexed: 11/23/2022] Open
Abstract
A relevant part of embolic strokes of undetermined source (ESUS) is assumed to be due to non-detected atrial fibrillation (AF). In this study, we aimed to investigate if markers of endothelial dysfunction and damage may indicate AF risk in embolic stroke. Eighty-eight patients with ischemic stroke confirmed by imaging were assigned to one of three groups: ESUS, AF, or micro-/macroangiopathy. ESUS patients underwent prolonged Holter electrocardiography scheduled for three days. The National Institutes of Health Stroke Scale (NIHSS), the CHA2DS2VASC score, and the carotid intima–media thickness (CIMT) were obtained. Markers of endothelial (dys)function (L-arginine, asymmetric dimethylarginine (ADMA), symmetric dimethylarginine (SDMA)) were measured at day seven after stroke. ESUS patients were younger and had fewer cardiovascular risk factors than patients with determined stroke etiology. Compared with AF patients, ESUS patients showed significantly lower values of SDMA (p = 0.004) and higher values of L-arginine (p = 0.031), L-arginine/ADMA ratio (p = 0.006), L-arginine/SDMA ratio (p = 0.002), and ADMA/SDMA ratio (p = 0.013). Concordant differences could be observed comparing ESUS patients with those with newly diagnosed AF (p = 0.026; p = 0.03; p = 0.009; p = 0.004; and p = 0.046, respectively). CIMT was significantly larger in AF than in ESUS patients (p < 0.001), and was identified as an AF risk factor independent from CHA2DS2VASC in the regression analysis (p = 0.014). These findings may support future stratification for AF risk in patients who have suffered embolic stroke.
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Affiliation(s)
- Gerrit M Grosse
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Saskia Biber
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
- Department of Cardiology, Hannover Medical School, 30625 Hannover, Germany.
| | | | - Jens Martens-Lobenhoffer
- Institute of Clinical Pharmacology, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany.
| | - Maria M Gabriel
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Anne-Sophie Putzer
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Isabel Hasse
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Till van Gemmeren
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Ramona Schuppner
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Hans Worthmann
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
| | - Ralf Lichtinghagen
- Institute of Clinical Chemistry, Hannover Medical School, 30625 Hannover, Germany.
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany.
| | - Udo Bavendiek
- Department of Cardiology, Hannover Medical School, 30625 Hannover, Germany.
| | - Karin Weissenborn
- Department of Neurology, Hannover Medical School, 30625 Hannover, Germany.
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18
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Czarnecka A, Aleksandrowicz M, Jasiński K, Jaźwiec R, Kalita K, Hilgier W, Zielińska M. Cerebrovascular reactivity and cerebral perfusion of rats with acute liver failure: role of L-glutamine and asymmetric dimethylarginine in L-arginine-induced response. J Neurochem 2018; 147:692-704. [PMID: 30151828 DOI: 10.1111/jnc.14578] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/27/2018] [Accepted: 08/16/2018] [Indexed: 01/19/2023]
Abstract
Cerebral blood flow (CBF) is impaired in acute liver failure (ALF), however, the complexity of the underlying mechanisms has often led to inconclusive interpretations. Regulation of CBF depends at least partially on variations in the local brain L-arginine concentration and/or its metabolic rate. In ALF, other factors, like an increased concentration of asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor and elevated level of L-glutamine, may contribute to CBF alteration. This study demonstrated strong differences in the reactivity of the middle cerebral arteries and their response to extravascular L-arginine application between vessels isolated from rats with thioacetamide (TAA)-induced ALF and control animals. Our results also showed the decrease in the cerebral perfusion in TAA rats measured by arterial spin labeling perfusion magnetic resonance. Subsequently, we aimed to investigate the importance of balance between the concentration of ADMA and L-arginine in the CBF regulation. In vivo, intraperitoneal L-arginine administration in TAA rats corrected: (i) decrease in cerebral perfusion, (ii) decrease in brain extracellular L-arginine/ADMA ratio and (iii) increase in brain L-glutamine concentration. Our study implicates that impaired vascular tone of cerebral arteries is most likely associated with exposure to high ADMA and L-glutamine levels resulting in limited availability of L-arginine and might be responsible for reduced cerebral perfusion observed in ALF.
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Affiliation(s)
- Anna Czarnecka
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Marta Aleksandrowicz
- Department of Neurosurgery, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Krzysztof Jasiński
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Radosław Jaźwiec
- Mass Spectrometry Laboratory, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Katarzyna Kalita
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Wojciech Hilgier
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
| | - Magdalena Zielińska
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland
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19
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Fleszar MG, Wiśniewski J, Krzystek-Korpacka M, Misiak B, Frydecka D, Piechowicz J, Lorenc-Kukuła K, Gamian A. Quantitative Analysis of l-Arginine, Dimethylated Arginine Derivatives, l-Citrulline, and Dimethylamine in Human Serum Using Liquid Chromatography-Mass Spectrometric Method. Chromatographia 2018; 81:911-921. [PMID: 29887621 PMCID: PMC5972178 DOI: 10.1007/s10337-018-3520-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/03/2018] [Accepted: 04/06/2018] [Indexed: 11/24/2022]
Abstract
ABSTRACT Nitric oxide (NO) is a small molecule involved in the regulation of many physiological processes. It plays a crucial role in the regulation of nervous system, immune and inflammatory responses, and blood flow. NO is synthesized by nitric oxide synthase (NOS) during two-step oxidation of l-arginine to l-citrulline. Intermediates and derivatives of NO metabolism, such as l-arginine, l-citrulline, asymmetrical dimethylarginine (ADMA), symmetrical dimethylarginine (SDMA), and dimethylamine (DMA), are investigated as potential biomarkers. In this article, we present a novel analytical method that allowed for simultaneous analysis of l-arginine, ADMA, SDMA, l-citrulline, and DMA, in a single-step extraction and derivatization using benzoyl chloride. In brief, aliquots of serum were mixed with internal standard solution mixture (50 µM D6-DMA, 20 µM D7-ADMA, and 100 µM D7-arginine) and 0.025 M borate buffer, pH 9.2 (10:1:5). The derivatization process was performed at 25 °C for 5 min using 10% benzoyl chloride. A reverse phase column was used for chromatographic separation. Quantitation was performed using following ions (m/z): 279.1457, 286.1749, 307.1717, 314.2076, 280.1297, 150.0919, and 156.1113 for l-arginine, D7-arginine, ADMA, SDMA, D7-ADMA, l-citrulline, DMA, and D6-DMA, respectively. The method was validated, and its assay linearity, accuracy and precision, recovery, and limits of detection (1.7 µM l-arginine, 0.03 µM ADMA, 0.02 µM SDMA, 0.36 µM l-citrulline, 0.06 µM DMA) and quantification (3.2 µM l-arginine, 0.08 µM ADMA, 0.05 µM SDMA, 1.08 µM l-citrulline, 0.19 µM DMA) were determined. The method is sensitive, reliable, repeatable, and reproducible. It can be applied in the routine clinical/diagnostic laboratory. GRAPHICAL ABSTRACT
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Affiliation(s)
- Mariusz G. Fleszar
- Department of Medical Biochemistry, Wroclaw Medical University, ul. Chalubinskiego 10, 50-368 Wroclaw, Poland
| | - Jerzy Wiśniewski
- Department of Medical Biochemistry, Wroclaw Medical University, ul. Chalubinskiego 10, 50-368 Wroclaw, Poland
| | | | - Błażej Misiak
- Department of Psychiatry, Wroclaw Medical University, 10 Pasteur Street, 50-367 Wroclaw, Poland
- Department of Genetics, Wroclaw Medical University, 1 Marcinkowski Street, 50-368 Wroclaw, Poland
| | - Dorota Frydecka
- Department of Psychiatry, Wroclaw Medical University, 10 Pasteur Street, 50-367 Wroclaw, Poland
| | - Joanna Piechowicz
- Department of Medical Biochemistry, Wroclaw Medical University, ul. Chalubinskiego 10, 50-368 Wroclaw, Poland
| | - Katarzyna Lorenc-Kukuła
- Shimadzu Center for Advanced Analytical Chemistry, University of Texas at Arlington, Arlington, TX USA
| | - Andrzej Gamian
- Department of Medical Biochemistry, Wroclaw Medical University, ul. Chalubinskiego 10, 50-368 Wroclaw, Poland
- Wroclaw Research Center EIT+, Wroclaw, Poland
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20
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Worthmann H, Li N, Martens-Lobenhoffer J, Dirks M, Schuppner R, Lichtinghagen R, Kielstein JT, Raab P, Lanfermann H, Bode-Böger SM, Weissenborn K. Dimethylarginines in patients with intracerebral hemorrhage: association with outcome, hematoma enlargement, and edema. J Neuroinflammation 2017; 14:247. [PMID: 29237474 PMCID: PMC5729507 DOI: 10.1186/s12974-017-1016-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 11/28/2017] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Asymmetric dimethylarginine (ADMA)--the most potent endogenous NO-synthase inhibitor, has been regarded as mediator of endothelial dysfunction and oxidative stress. Considering experimental data, levels of ADMA and its structural isomer symmetric dimethylarginine (SDMA) might be elevated after intracerebral hemorrhage (ICH) and associated with clinical outcome and secondary brain injury. METHODS Blood samples from 20 patients with acute ICH were taken at ≤ 24 h and 3 and 7 days after the event. Nine patients had favorable (modified Rankin Scale (mRS) at 90 days 0-2) outcome, and 11 patients unfavorable outcome (mRS 3-6). Patients' serum ADMA, SDMA, and L-arginine levels were determined by high-performance liquid chromatography-tandem mass spectrometry. Levels were compared to those of 30 control subjects without ICH. For further analysis, patients were grouped according to outcome, hematoma and perihematomal edema volumes, occurrence of hematoma enlargement, and cytotoxic edema as measured by computed tomography and serial magnetic resonance imaging. RESULTS Levels of ADMA--but not SDMA and L-arginine--were elevated in ICH patients compared to controls (binary logistic regression analysis: ADMA ≤ 24 h, p = 0.003; 3 days p = 0.005; 7 days p = 0.004). If patients were grouped according to outcome, dimethylarginines were increased in patients with unfavorable outcome. The binary logistic regression analysis confirmed an association of SDMA levels ≤ 24 h (p = 0.048) and at 3 days (p = 0.028) with unfavorable outcome. ADMA ≤ 24 h was increased in patients with hematoma enlargement (p = 0.003), while SDMA ≤ 24 h was increased in patients with large hematoma (p = 0.029) and perihematomal edema volume (p = 0.023). CONCLUSIONS Our data demonstrate an association between dimethylarginines and outcome of ICH. However, further studies are needed to confirm this relationship and elucidate the mechanisms behind.
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Affiliation(s)
- Hans Worthmann
- Department of Neurology, Hannover Medical School, 30623, Hannover, Germany.
| | - Na Li
- Department of Neurology, Hannover Medical School, 30623, Hannover, Germany.,Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Jens Martens-Lobenhoffer
- Department of Clinical Pharmacology, Otto-von-Guericke-University of Magdeburg, University Hospital, Magdeburg, Germany
| | - Meike Dirks
- Department of Neurology, Hannover Medical School, 30623, Hannover, Germany
| | - Ramona Schuppner
- Department of Neurology, Hannover Medical School, 30623, Hannover, Germany
| | - Ralf Lichtinghagen
- Department of Clinical Chemistry, Hannover Medical School, Hannover, Germany
| | - Jan T Kielstein
- Department of Nephrology and Hypertension, Hannover Medical School, Hannover, Germany.,Medical Clinic V, Academic Teaching Hospital Braunschweig, Braunschweig, Germany
| | - Peter Raab
- Institute of Diagnostic and Interventional Neuroradiology, Hannover Medical School, Hannover, Germany
| | - Heinrich Lanfermann
- Institute of Diagnostic and Interventional Neuroradiology, Hannover Medical School, Hannover, Germany
| | - Stefanie M Bode-Böger
- Department of Clinical Pharmacology, Otto-von-Guericke-University of Magdeburg, University Hospital, Magdeburg, Germany
| | - Karin Weissenborn
- Department of Neurology, Hannover Medical School, 30623, Hannover, Germany
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Milewski K, Bogacińska-Karaś M, Fręśko I, Hilgier W, Jaźwiec R, Albrecht J, Zielińska M. Ammonia Reduces Intracellular Asymmetric Dimethylarginine in Cultured Astrocytes Stimulating Its y⁺LAT2 Carrier-Mediated Loss. Int J Mol Sci 2017; 18:ijms18112308. [PMID: 29099056 PMCID: PMC5713277 DOI: 10.3390/ijms18112308] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 10/19/2017] [Accepted: 10/27/2017] [Indexed: 01/24/2023] Open
Abstract
Previously we had shown that ammonia stimulates nitric oxide (NO) synthesis in astrocytes by increasing the uptake of the precursor amino acid, arginine via the heteromeric arginine/glutamine transporter y+LAT2. Ammonia also increases the concentration in the brain of the endogenous inhibitor of nitric oxide synthases (NOS), asymmetric dimethylarginine (ADMA), but distribution of ADMA surplus between the intraastrocytic and extracellular compartments of the brain has not been studied. Here we tested the hypothesis that ammonia modulates the distribution of ADMA and its analog symmetric dimethylarginine (SDMA) between the two compartments of the brain by competition with arginine for the y+LAT2 transporter. In extension of the hypothesis we analyzed the ADMA/Arg interaction in endothelial cells forming the blood-brain barrier. We measured by high-performance liquid chromatography (HPLC) and mass spectrometry (MS) technique the concentration of arginine, ADMA and SDMA in cultured cortical astrocytes and in a rat brain endothelial cell line (RBE-4) treated with ammonia and the effect of silencing the expression of a gene coding y+LAT2. We also tested the expression of ADMA metabolism enzymes: protein arginine methyltransferase (PRMT) and dimethylarginine dimethyl aminohydrolase (DDAH) and arginine uptake to astrocytes. Treatment for 48 h with 5 mM ammonia led to an almost 50% reduction of ADMA and SDMA concentration in both cell types, and the effect in astrocytes was substantially attenuated by silencing of the Slc7a6 gene. Moreover, the y+LAT2-dependent component of ammonia-evoked arginine uptake in astrocytes was reduced in the presence of ADMA in the medium. Our results suggest that increased ADMA efflux mediated by upregulated y+LAT2 may be a mechanism by which ammonia interferes with intra-astrocytic (and possibly intra-endothelial cell) ADMA content and subsequently, NO synthesis in both cell types.
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Affiliation(s)
- Krzysztof Milewski
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Małgorzata Bogacińska-Karaś
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Inez Fręśko
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Wojciech Hilgier
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Radosław Jaźwiec
- Mass Spectrometry Laboratory, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Jan Albrecht
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
| | - Magdalena Zielińska
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
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22
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Rodionov RN, Heinrich A, Brilloff S, Jarzebska N, Martens-Lobenhoffer J, Bode-Böger SM, Todorov VT, Hugo CP, Weiss N, Hohenstein B. ADMA reduction does not protect mice with streptozotocin-induced diabetes mellitus from development of diabetic nephropathy. ATHEROSCLEROSIS SUPP 2017; 30:319-325. [DOI: 10.1016/j.atherosclerosissup.2017.05.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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23
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Wiśniewski J, Fleszar MG, Piechowicz J, Krzystek-Korpacka M, Chachaj A, Szuba A, Lorenc-Kukula K, Masłowski L, Witkiewicz W, Gamian A. A novel mass spectrometry-based method for simultaneous determination of asymmetric and symmetric dimethylarginine, l
-arginine and l
-citrulline optimized for LC-MS-TOF and LC-MS/MS. Biomed Chromatogr 2017; 31. [DOI: 10.1002/bmc.3994] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/20/2017] [Accepted: 04/19/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Jerzy Wiśniewski
- Department of Medical Biochemistry; Wroclaw Medical University; Wroclaw Poland
| | - Mariusz G. Fleszar
- Department of Medical Biochemistry; Wroclaw Medical University; Wroclaw Poland
| | - Joanna Piechowicz
- Department of Medical Biochemistry; Wroclaw Medical University; Wroclaw Poland
| | | | - Angelika Chachaj
- Department of Angiology; Wroclaw Medical University; Wroclaw Poland
- Department of Internal Medicine; 4th Military Hospital; Wroclaw Poland
| | - Andrzej Szuba
- Department of Angiology; Wroclaw Medical University; Wroclaw Poland
- Department of Internal Medicine; 4th Military Hospital; Wroclaw Poland
| | - Katarzyna Lorenc-Kukula
- Shimadzu Center For Advanced Analytical Chemistry; The University of Texas at Arlington; TX USA
| | - Leszek Masłowski
- Department of Vascular Surgery; Regional Specialist Hospital; Wroclaw Poland
| | - Wojciech Witkiewicz
- Department of Surgical Oncology; Regional Specialist Hospital; Wroclaw Poland
- Research and Development Center at Regional Specialist Hospital; Wroclaw Poland
| | - Andrzej Gamian
- Department of Medical Biochemistry; Wroclaw Medical University; Wroclaw Poland
- Wroclaw Research Center EIT+; Wroclaw Poland
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24
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Lee S, Jang WJ, Choi B, Joo SH, Jeong CH. Comparative metabolomic analysis of HPAC cells following the acquisition of erlotinib resistance. Oncol Lett 2017; 13:3437-3444. [PMID: 28529573 PMCID: PMC5431587 DOI: 10.3892/ol.2017.5940] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 02/17/2017] [Indexed: 12/30/2022] Open
Abstract
Pancreatic cancer is one of the most lethal types of cancer, due to difficulty in early detection and the limited efficacy of available treatments. Erlotinib is used to inhibit the epidermal growth factor receptor for the treatment of pancreatic cancer; however, erlotinib resistance is a major issue and the mechanisms underlying the development of erlotinib resistance remain unclear. To better understand the alterations in tumor metabolism by acquired resistance to erlotinib, an erlotinib-resistant pancreatic cancer cell line (HPAC-ER) was established, followed by a comparison of the metabolic characteristics between these cells and their erlotinib-sensitive parental cells (HPAC). This comparison was accomplished through mass spectrometry-based targeted metabolic profiling. Five metabolite groups (acylcarnitines, amino acids and biogenic amines, glycerophospholipids, sphingolipids and monosaccharides) were semi-quantified and compared statistically. These results revealed significant differences between the two groups of cells. A significant increase in the level of short-chain acylcarnitines and selected lysophosphatidylcholines, and a significant decrease in the level of acyl-alkyl-phosphatidylcholines and one sphingolipid, were observed in the HPAC-ER cells compared with the HPAC cells. The metabolic changes observed in the present study support the theory that there are increased metabolic demands in erlotinib-resistant cancer, reflecting the changes in acetyl-CoA-associated and choline phospholipid metabolism. These findings will aid in elucidating the changes that occur in pancreatic cancer metabolism through the acquired resistance to erlotinib, and in the identification of biomarkers for the early detection of pancreatic cancer.
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Affiliation(s)
- Sooyeun Lee
- College of Pharmacy, Keimyung University, Dalseo, Daegu 42601, Republic of Korea
| | - Won-Jun Jang
- College of Pharmacy, Keimyung University, Dalseo, Daegu 42601, Republic of Korea
| | - Boyeon Choi
- College of Pharmacy, Keimyung University, Dalseo, Daegu 42601, Republic of Korea
| | - Sang Hoon Joo
- Department of Pharmacy, Catholic University of Daegu, Gyeongsan-si, Gyeongbuk 38430, Republic of Korea
| | - Chul-Ho Jeong
- College of Pharmacy, Keimyung University, Dalseo, Daegu 42601, Republic of Korea
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25
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Czarnecka A, Milewski K, Jaźwiec R, Zielińska M. Intracerebral Administration of S-Adenosylhomocysteine or S-Adenosylmethionine Attenuates the Increases in the Cortical Extracellular Levels of Dimethylarginines Without Affecting cGMP Level in Rats with Acute Liver Failure. Neurotox Res 2017; 31:99-108. [PMID: 27604291 PMCID: PMC5209417 DOI: 10.1007/s12640-016-9668-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 08/25/2016] [Accepted: 08/30/2016] [Indexed: 12/30/2022]
Abstract
Alterations in brain nitric oxide (NO)/cGMP synthesis contribute to the pathogenesis of hepatic encephalopathy (HE). An increased asymmetrically dimethylated derivative of L-arginine (ADMA), an endogenous inhibitor of NO synthases, was observed in plasma of HE patients and animal models. It is not clear whether changes in brain ADMA reflect its increased local synthesis therefore affecting NO/cGMP pathway, or are a consequence of its increased peripheral blood content. We measured extracellular concentration of ADMA and symmetrically dimethylated isoform (SDMA) in the prefrontal cortex of control and thioacetamide (TAA)-induced HE rats. A contribution of locally synthesized dimethylarginines (DMAs) in their extracellular level in the brain was studied after direct infusion of the inhibitor of DMAs synthesizing enzymes (PRMTs), S-adenosylhomocysteine (AdoHcy, 2 mM), or the methyl donor, S-adenosylmethionine (AdoMet, 2 mM), via a microdialysis probe. Next, we analyzed whether locally synthesized ADMA attains physiological significance by determination of extracellular cGMP. The expression of PRMT-1 was also examined. Concentration of ADMA and SDMA, detected by positive mode electrospray LC-DMS-MS/MS, was greatly enhanced in TAA rats and was decreased (by 30 %) after AdoHcy and AdoMet infusion. TAA-induced increase (by 40 %) in cGMP was unaffected after AdoHcy administration. The expression of PRMT-1 in TAA rat brain was unaltered. The results suggest that (i) the TAA-induced increase in extracellular DMAs may result from their effective synthesis in the brain, and (ii) the excess of extracellular ADMA does not translate into changes in the extracellular cGMP concentration and implicate a minor role in brain NO/cGMP pathway control.
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Affiliation(s)
- Anna Czarnecka
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Street, 02-106, Warsaw, Poland
| | - Krzysztof Milewski
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Street, 02-106, Warsaw, Poland
| | - Radosław Jaźwiec
- Mass Spectrometry Laboratory, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawińskiego Street, 02-106, Warsaw, Poland
| | - Magdalena Zielińska
- Department of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Street, 02-106, Warsaw, Poland.
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26
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Burdin DV, Kolobov AA, Brocker C, Soshnev AA, Samusik N, Demyanov AV, Brilloff S, Jarzebska N, Martens-Lobenhoffer J, Mieth M, Maas R, Bornstein SR, Bode-Böger SM, Gonzalez F, Weiss N, Rodionov RN. Diabetes-linked transcription factor HNF4α regulates metabolism of endogenous methylarginines and β-aminoisobutyric acid by controlling expression of alanine-glyoxylate aminotransferase 2. Sci Rep 2016; 6:35503. [PMID: 27752141 PMCID: PMC5067591 DOI: 10.1038/srep35503] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 09/30/2016] [Indexed: 02/07/2023] Open
Abstract
Elevated levels of circulating asymmetric and symmetric dimethylarginines (ADMA and SDMA) predict and potentially contribute to end organ damage in cardiovascular diseases. Alanine-glyoxylate aminotransferase 2 (AGXT2) regulates systemic levels of ADMA and SDMA, and also of beta-aminoisobutyric acid (BAIB)-a modulator of lipid metabolism. We identified a putative binding site for hepatic nuclear factor 4 α (HNF4α) in AGXT2 promoter sequence. In a luciferase reporter assay we found a 75% decrease in activity of Agxt2 core promoter after disruption of the HNF4α binding site. Direct binding of HNF4α to Agxt2 promoter was confirmed by chromatin immunoprecipitation assay. siRNA-mediated knockdown of Hnf4a led to an almost 50% reduction in Agxt2 mRNA levels in Hepa 1–6 cells. Liver-specific Hnf4a knockout mice exhibited a 90% decrease in liver Agxt2 expression and activity, and elevated plasma levels of ADMA, SDMA and BAIB, compared to wild-type littermates. Thus we identified HNF4α as a major regulator of Agxt2 expression. Considering a strong association between human HNF4A polymorphisms and increased risk of type 2 diabetes our current findings suggest that downregulation of AGXT2 and subsequent impairment in metabolism of dimethylarginines and BAIB caused by HNF4α deficiency might contribute to development of cardiovascular complications in diabetic patients.
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Affiliation(s)
- Dmitry V Burdin
- Department of Physiology, Saint Petersburg State University, 199034 Saint Petersburg, Russia
| | - Alexey A Kolobov
- Department of Biochemistry, Saint Petersburg State University, 199034 Saint Petersburg, Russia
| | - Chad Brocker
- National Cancer Institute, NIH, Bethesda, MD, 20892, USA
| | | | - Nikolay Samusik
- Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Anton V Demyanov
- Institute of Highly Pure Biopreparations, 197110 Saint Petersburg, Russia
| | - Silke Brilloff
- University Center for Vascular Medicine, Technische Universität Dresden, 01307 Dresden, Germany
| | - Natalia Jarzebska
- University Center for Vascular Medicine, Technische Universität Dresden, 01307 Dresden, Germany
| | | | - Maren Mieth
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Renke Maas
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), 91054 Erlangen, Germany
| | - Stefan R Bornstein
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, 39120 Magdeburg, Germany
| | - Frank Gonzalez
- National Cancer Institute, NIH, Bethesda, MD, 20892, USA
| | - Norbert Weiss
- University Center for Vascular Medicine, Technische Universität Dresden, 01307 Dresden, Germany
| | - Roman N Rodionov
- University Center for Vascular Medicine, Technische Universität Dresden, 01307 Dresden, Germany
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A Novel Pathway for Metabolism of the Cardiovascular Risk Factor Homoarginine by alanine:glyoxylate aminotransferase 2. Sci Rep 2016; 6:35277. [PMID: 27752063 PMCID: PMC5082758 DOI: 10.1038/srep35277] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 09/23/2016] [Indexed: 01/06/2023] Open
Abstract
Low plasma concentrations of L-homoarginine are associated with an increased risk of cardiovascular events, while homoarginine supplementation is protective in animal models of metabolic syndrome and stroke. Catabolism of homoarginine is still poorly understood. Based on the recent findings from a Genome Wide Association Study we hypothesized that homoarginine can be metabolized by alanine:glyoxylate aminotransferase 2 (AGXT2). We purified human AGXT2 from tissues of AGXT2 transgenic mice and demonstrated its ability to metabolize homoarginine to 6-guanidino-2-oxocaproic acid (GOCA). After incubation of HepG2 cells overexpressing AGXT2 with isotope-labeled homoarginine-d4 we were able to detect labeled GOCA in the medium. We injected wild type mice with labeled homoarginine and detected labeled GOCA in the plasma. We found that AGXT2 knockout (KO) mice have higher homoarginine and lower GOCA plasma levels as compared to wild type mice, while the reverse was true for AGXT2 transgenic (Tg) mice. In summary, we experimentally proved the presence of a new pathway of homoarginine catabolism – its transamination by AGXT2 with formation of GOCA and demonstrated that endogenous AGXT2 is required for maintenance of homoarginine levels in mice. Our findings may lead to development of novel therapeutic approaches for cardiovascular pathologies associated with homoarginine deficiency.
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28
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Tang DQ, Zou L, Yin XX, Ong CN. HILIC-MS for metabolomics: An attractive and complementary approach to RPLC-MS. MASS SPECTROMETRY REVIEWS 2016; 35:574-600. [PMID: 25284160 DOI: 10.1002/mas.21445] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 07/28/2014] [Indexed: 05/14/2023]
Abstract
Hydrophilic interaction chromatography (HILIC) is an emerging separation mode of liquid chromatography (LC). Using highly hydrophilic stationary phases capable of retaining polar/ionic metabolites, and accompany with high organic content mobile phase that offer readily compatibility with mass spectrometry (MS) has made HILIC an attractive complementary tool to the widely used reverse-phase (RP) chromatographic separations in metabolomic studies. The combination of HILIC and RPLC coupled with an MS detector expands the number of detected analytes and provides more comprehensive metabolite coverage than use of only RP chromatography. This review describes the recent applications of HILIC-MS/MS in metabolomic studies, ranging from amino acids, lipids, nucleotides, organic acids, pharmaceuticals, and metabolites of specific nature. The biological systems investigated include microbials, cultured cell line, plants, herbal medicine, urine, and serum as well as tissues from animals and humans. Owing to its unique capability to measure more-polar biomolecules, the HILIC separation technique would no doubt enhance the comprehensiveness of metabolite detection, and add significant value for metabolomic investigations. © 2014 Wiley Periodicals, Inc. Mass Spec Rev 35:574-600, 2016.
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Affiliation(s)
- Dao-Quan Tang
- Department of Pharmaceutical Analysis, Xuzhou Medical College, Xuzhou, 221044, China
- Jiangsu Key Lab for the study of New Drug and Clinical Pharmacy, Xuzhou Medical College, Yunlong, China
- NUS Environmental Research Inst., National University of Singapore, 5 A Engineering Srive 1, Singapore, 117411, Singapore
| | - Ll Zou
- Saw Swee Hock School of Public Health, National University of Singapore, 16 Medical Drive, Singapore, 117597, Singapore
| | - Xiao-Xing Yin
- Jiangsu Key Lab for the study of New Drug and Clinical Pharmacy, Xuzhou Medical College, Yunlong, China
| | - Choon Nam Ong
- NUS Environmental Research Inst., National University of Singapore, 5 A Engineering Srive 1, Singapore, 117411, Singapore
- Saw Swee Hock School of Public Health, National University of Singapore, 16 Medical Drive, Singapore, 117597, Singapore
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Determination of Asymmetric and Symmetric Dimethylarginine in Serum from Patients with Chronic Kidney Disease: UPLC-MS/MS versus ELISA. Toxins (Basel) 2016; 8:toxins8050149. [PMID: 27187471 PMCID: PMC4885064 DOI: 10.3390/toxins8050149] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/19/2016] [Accepted: 05/04/2016] [Indexed: 02/07/2023] Open
Abstract
Asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide (NO) synthesis, and its structural isomer symmetric dimethylarginine (SDMA) are uremic toxins accumulating in chronic kidney disease (CKD) patients. The objective of this study was to develop and validate a robust UPLC-MS/MS method for the simultaneous determination of ADMA and SDMA in human serum. Chromatographic separation after butyl ester derivatization was achieved on an Acquity UPLC BEH C18 column, followed by tandem mass spectrometric detection. After validation, the applicability of the method was evaluated by the analysis of serum samples from 10 healthy controls and 77 CKD patients on hemodialysis (CKD5HD). Both ADMA (0.84 ± 0.19 µM vs. 0.52 ± 0.07 µM) and SDMA concentrations (2.06 ± 0.82 µM vs. 0.59 ± 0.13 µM) were significantly (p < 0.001) elevated in CKD5HD patients compared to healthy controls. In general, low degrees of protein binding were found for both ADMA and SDMA. In addition, an established commercially available ELISA kit was utilized on the same samples (n = 87) to compare values obtained both with ELISA and UPLC-MS/MS. Regression analysis between these two methods was significant (p < 0.0001) but moderate for both ADMA (R = 0.78) and SDMA (R = 0.72).
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Pesek JJ, Matyksa MT, Modereger B, Hasbun A, Phan VT, Mehr Z, Guzman M, Watanable S. The separation and analysis of symmetric and asymmetric dimethylarginine and other hydrophilic isobaric compounds using aqueous normal phase chromatography. J Chromatogr A 2016; 1441:52-9. [DOI: 10.1016/j.chroma.2016.02.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 02/19/2016] [Accepted: 02/22/2016] [Indexed: 10/22/2022]
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Rodionov RN, Martens-Lobenhoffer J, Brilloff S, Burdin DV, Jarzebska N, Demyanov AV, Hohenstein B, Weiss N, Bode-Böger SM. Acetylation of asymmetric and symmetric dimethylarginine: an undercharacterized pathway of metabolism of endogenous methylarginines. Nephrol Dial Transplant 2015; 31:57-63. [PMID: 26610597 DOI: 10.1093/ndt/gfv390] [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] [Received: 07/24/2015] [Accepted: 10/08/2015] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Increased levels of asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) are associated with cardiovascular and renal diseases. We and others have shown that both ADMA and SDMA can be Nα-acetylated to form asymmetric and symmetric Nα-acetyldimethylarginine (Ac-ADMA and Ac-SDMA). The current study further investigated this undercharacterized metabolic pathway. METHODS ADMA and SDMA were infused in C57/BL6 mice for 3 days using osmotic minipumps. Half of the mice underwent bilateral nephrectomy 24 h before completion of the infusion. Plasma and tissue levels of Ac-ADMA and Ac-SDMA were detected by liquid chromatography-tandem mass spectrometry. RESULTS ADMA and SDMA infusion resulted in a 3.6-fold increase in plasma Ac-ADMA and a 21-fold increase in plasma Ac-SDMA levels, respectively. Plasma Ac-ADMA and Ac-SDMA levels were dramatically increased after bilateral nephrectomy. The highest baseline tissue concentrations of Ac-ADMA and Ac-SDMA in wild-type mice were detected in the liver, kidney, small intestine, pancreas and spleen. Incubation of the tissue lysates with ADMA and SDMA resulted in increased levels of the corresponding Nα-acetylated products only in the liver, kidney and small intestine. CONCLUSIONS Our results show that overload of ADMA or SDMA leads to an increase in plasma Ac-ADMA and Ac-SDMA levels. This observation is consistent with the hypothesis that Ac-ADMA and Ac-SDMA are formed directly from ADMA and SDMA in vivo. The increase in plasma Ac-ADMA and Ac-SDMA concentrations after bilateral nephrectomy suggests that both compounds are predominantly eliminated via the kidneys. We demonstrated that acetylation of ADMA and SDMA occurs primarily in the liver, kidney and small intestine.
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Affiliation(s)
- Roman N Rodionov
- University Center for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | | | - Silke Brilloff
- University Center for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Dmitry V Burdin
- Department of General Physiology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | - Natalia Jarzebska
- University Center for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Anton V Demyanov
- Institute of Highly Pure Biopreparations, Saint-Petersburg, Russia
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Norbert Weiss
- University Center for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstraße 74, 01307 Dresden, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Magdeburg, Germany
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Martens-Lobenhoffer J, Bode-Böger SM, Clement B. First detection and quantification of N(δ)-monomethylarginine, a structural isomer of N(G)-monomethylarginine, in humans using MS(3). Anal Biochem 2015; 493:14-20. [PMID: 26464121 DOI: 10.1016/j.ab.2015.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 09/30/2015] [Accepted: 10/01/2015] [Indexed: 11/27/2022]
Abstract
The L-arginine metabolites methylated at the guanidino moiety, such as N(G)-monomethyl-L-arginine (LNMMA), asymmetric N(G),N(G)-dimethyl-L-arginine (ADMA), and symmetric N(G),N(G')-dimethyl-L-arginine (SDMA), are long known to be present in human plasma. Far less is known about the structural isomer of LNMMA, N(δ)-monomethyl-L-arginine (δ-MMA). In prior work, it has been detected in yeast proteins, but it has not been investigated in mammalian plasma or cells. In this work, we present a method for the simultaneous and unambiguous quantification of LNMMA and δ-MMA in human plasma that is capable of detecting δ-MMA separately from LNMMA. The method comprises a simple protein precipitation sample preparation, hydrophilic interaction liquid chromatography (HILIC) gradient elution on an unmodified silica column, and triple stage mass spectrometric detection. Stable isotope-labeled D6-SDMA was used as internal standard. The calibration ranges were 25-1000 nmol/L for LNMMA and 5-350 nmol/L for δ-MMA. The intra- and inter-batch precision determinations resulted in relative standard deviations of less than 12% for both compounds with accuracies of less than 6% deviation from the expected values. In a pilot study enrolling 10 healthy volunteers, mean concentrations of 48.0 ± 7.4 nmol/L for LNMMA and 27.4 ± 7.7 nmol/L for δ-MMA were found.
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Affiliation(s)
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto von Guericke University, 39120 Magdeburg, Germany
| | - Bernd Clement
- Pharmaceutical Institute, Christian Albrechts University, 24118 Kiel, Germany
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van Dyk M, Mangoni AA, McEvoy M, Attia JR, Sorich MJ, Rowland A. Targeted arginine metabolomics: A rapid, simple UPLC-QToF-MSE based approach for assessing the involvement of arginine metabolism in human disease. Clin Chim Acta 2015; 447:59-65. [DOI: 10.1016/j.cca.2015.05.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/08/2015] [Accepted: 05/08/2015] [Indexed: 01/06/2023]
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The l-arginine/NO pathway, homoarginine, and nitrite-dependent renal carbonic anhydrase activity in young people with type 1 diabetes mellitus. Amino Acids 2015; 47:1865-74. [DOI: 10.1007/s00726-015-2027-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/10/2015] [Indexed: 02/05/2023]
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Khalil A, Hardman L, O´Brien P. The role of arginine, homoarginine and nitric oxide in pregnancy. Amino Acids 2015; 47:1715-27. [DOI: 10.1007/s00726-015-2014-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 05/21/2015] [Indexed: 12/12/2022]
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Biosynthesis of homoarginine (hArg) and asymmetric dimethylarginine (ADMA) from acutely and chronically administered free L-arginine in humans. Amino Acids 2015; 47:1893-908. [PMID: 26031828 DOI: 10.1007/s00726-015-2012-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 05/18/2015] [Indexed: 12/17/2022]
Abstract
Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide (NO) synthesis, whereas L-arginine (Arg) and L-homoarginine (hArg) serve as substrates for NO synthesis. ADMA and other methylated arginines are generally believed to exclusively derive from guanidine (N (G))-methylated arginine residues in proteins by protein arginine methyltransferases (PRMTs) that use S-adenosylmethionine (SAM) as the methyl donor. L-Lysine is known for decades as a precursor for hArg, but only recent studies indicate that arginine:glycine amidinotransferase (AGAT) is responsible for the synthesis of hArg. AGAT catalyzes the formation of guanidinoacetate (GAA) that is methylated to creatine by guanidinoacetate methyltransferase (GAMT) which also uses SAM. The aim of the present study was to learn more about the mechanisms of ADMA and hArg formation in humans. Especially, we hypothesized that ADMA is produced by N (G)-methylation of free Arg in addition to the known PRMTs-involving mechanism. In knockout mouse models of AGAT- and GAMT-deficiency, we investigated the contribution of these enzymes to hArg synthesis. Arg infusion (0.5 g/kg, 30 min) in children (n = 11) and ingestion of high-fat protein meals by overweight men (n = 10) were used to study acute effects on ADMA and hArg synthesis. Daily Arg ingestion (10 g) or placebo for 3 or 6 months by patients suffering from peripheral arterial occlusive disease (PAOD, n = 20) or coronary artery disease (CAD, n = 30) was used to study chronic effects of Arg on ADMA synthesis. Mass spectrometric methods were used to measure all biochemical parameters in plasma and urine samples. In mice, AGAT but not GAMT was found to contribute to plasma hArg, while ADMA synthesis was independent of AGAT and GAMT. Arg infusion acutely increased plasma Arg, hArg and ADMA concentrations, but decreased the plasma hArg/ADMA ratio. High-fat protein meals acutely increased plasma Arg, hArg, ADMA concentrations, as well as the plasma hArg/ADMA ratio. In the PAOD and CAD studies, plasma Arg concentration increased in the verum compared to the placebo groups. Plasma ADMA concentration increased only in the PAOD patients who received Arg. Our study suggests that in humans a minor fraction of free Arg is rapidly metabolized to ADMA and hArg. In mice, GAMT and N (G)-methyltransferases contribute to ADMA and hArg synthesis from Arg, whereas AGAT is involved in the synthesis of hArg but not of ADMA. The underlying biochemical mechanisms remain still elusive.
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Amino acid N-acetylation: Metabolic elimination of symmetric dimethylarginine as symmetric Nα-acetyldimethylarginine, determined in human plasma and urine by LC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 975:59-64. [DOI: 10.1016/j.jchromb.2014.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 11/10/2014] [Accepted: 11/11/2014] [Indexed: 12/29/2022]
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miR-21/DDAH1 pathway regulates pulmonary vascular responses to hypoxia. Biochem J 2014; 462:103-12. [PMID: 24895913 DOI: 10.1042/bj20140486] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The NOS (nitric oxide synthase) inhibitor ADMA (asymmetric dimethylarginine) contributes to the pathogenesis of pulmonary hypertension. Reduced levels of the enzymes metabolizing ADMA, dimethylarginine dimethylaminohydrolases (DDAH1 and DDAH2) and increased levels of miR-21 are linked to disease pathology, but the mechanisms are not understood. In the present study we assessed the potential role of miR-21 in the regulation of hypoxia-induced changes in ADMA metabolism in vitro and in vivo. Hypoxia inhibited DDAH1 and DDAH2 expression and increased ADMA levels in cultured human pulmonary endothelial cells. In contrast, in human pulmonary smooth muscle cells, only DDAH2 was reduced whereas ADMA levels remained unchanged. Endothelium-specific down-regulation of DDAH1 by miR-21 in hypoxia induced endothelial dysfunction and was prevented by overexpression of DDAH1 and miR-21 blockade. DDAH1, but not DDAH2, mRNA levels were reduced, whereas miR-21 levels were elevated in lung tissues from patients with pulmonary arterial hypertension and mice with pulmonary hypertension exposed to 2 weeks of hypoxia. Hypoxic mice treated with miR-21 inhibitors and DDAH1 transgenic mice showed elevated lung DDAH1, increased cGMP levels and attenuated pulmonary hypertension. Regulation of DDAH1 by miR-21 plays a role in the development of hypoxia-induced pulmonary hypertension and may be of broader significance in pulmonary hypertension.
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Andrade F, Llarena M, Lage S, Aldámiz-Echevarría L. Quantification of Arginine and its Methylated Derivatives in Healthy Children by Liquid Chromatography-Tandem Mass Spectrometry. J Chromatogr Sci 2014; 53:787-92. [DOI: 10.1093/chromsci/bmu126] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Indexed: 11/12/2022]
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Recent advances in hydrophilic interaction chromatography for quantitative analysis of endogenous and pharmaceutical compounds in plasma samples. Bioanalysis 2014; 6:2421-39. [DOI: 10.4155/bio.14.173] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
There is an increasing need for new analytical methods that can handle a large number of analytes in complex matrices. Hydrophilic interaction chromatography (HILIC) has recently been demonstrated as an important supplement to reversed-phase liquid chromatography for polar analytes, particularly endogenous compounds. With the increasing popularity of HILIC, progressively more polar phases with diverse functional groups have been developed. In addition, the coupling of HILIC to mass spectrometry offers the advantages of improved sensitivity by employing an organic-rich mobile phase. This article reviews recent applications of HILIC for the analysis of endogenous and pharmaceutical compounds in plasma samples. Furthermore, based on recent studies, we provide a discussion of column selection, sample pretreatment for HILIC analysis, and detection sensitivity.
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Rodionov RN, Martens-Lobenhoffer J, Brilloff S, Hohenstein B, Jarzebska N, Jabs N, Kittel A, Maas R, Weiss N, Bode-Böger SM. Role of alanine:glyoxylate aminotransferase 2 in metabolism of asymmetric dimethylarginine in the settings of asymmetric dimethylarginine overload and bilateral nephrectomy. Nephrol Dial Transplant 2014; 29:2035-42. [PMID: 25002409 DOI: 10.1093/ndt/gfu236] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Asymmetric and symmetric dimethylarginines (ADMA and SDMA) predict complications and mortality in cardiovascular and renal diseases. Alanine:glyoxylate aminotransferase 2 (AGXT2) can metabolize both ADMA and SDMA; however, this metabolic pathway is still poorly understood. The goal of our study was to test the hypothesis that AGXT2 is compensatory upregulated in the settings of ADMA overload and bilateral nephrectomy. METHODS ADMA was infused for 3 days using osmotic minipumps in mice. Half of the mice underwent bilateral nephrectomy 24 h before the end of the infusion. RESULTS Infusion of ADMA caused a 3- to 4-fold increase in plasma and urine ADMA levels and a 2- to 3-fold increase in plasma and urine levels of the ADMA-specific metabolite of AGXT2 α-keto-δ-(N,N-dimethylguanidino)valeric acid (DMGV). Bilateral nephrectomy led to an ∼4-fold increase of plasma SDMA levels, but did not change plasma ADMA levels. Interestingly, plasma levels of DMGV were elevated 32-fold in the mice, which underwent bilateral nephrectomy. Neither bilateral nephrectomy nor ADMA infusion caused upregulation of AGXT2 expression or activity. CONCLUSIONS Our data demonstrate that short-term elevation of systemic levels of ADMA leads to a dramatic increase of DMGV formation without upregulation of AGXT2 expression or activity, which suggests that AGXT2-mediated pathway of ADMA metabolism is not saturated under normal conditions and may play a major role in the maintenance of ADMA homeostasis in the setting of local or systemic elevation of ADMA levels.
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Affiliation(s)
- Roman N Rodionov
- University Center for Vascular Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | | | - Silke Brilloff
- University Center for Vascular Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Natalia Jarzebska
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Normund Jabs
- University Center for Vascular Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Anja Kittel
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Renke Maas
- Institute of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Norbert Weiss
- University Center for Vascular Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Magdeburg, Germany
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Martens-Lobenhoffer J, Rodionov RN, Bode-Böger SM. Determination of asymmetric Nα-acetyldimethylarginine in humans: a phase II metabolite of asymmetric dimethylarginine. Anal Biochem 2014; 452:25-30. [PMID: 24560726 DOI: 10.1016/j.ab.2014.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 01/28/2014] [Accepted: 02/11/2014] [Indexed: 11/25/2022]
Abstract
Asymmetric dimethylarginine (ADMA) is produced by protein methylation, a common mechanism of posttranslational protein modification. Elevated levels of ADMA lead to impaired endothelial nitric oxide production and subsequently to a range of cardiovascular and other diseases related to decreased nitric oxide production. Knowledge of the elimination pathways of ADMA and the possibility of influencing them is therefore of major clinical interest. One of these pathways is the N-acetylation and subsequent renal elimination of ADMA in the form of asymmetric Nα-acetyldimethylarginine (Ac-ADMA). In this work, we describe the first method to quantitatively determine Ac-ADMA in human plasma and urine. Ac-ADMA was separated by HPLC on a porous graphitic carbon column and selectively analyzed by tandem mass spectrometry. Ac-ADMA and the internal standard D7-Ac-ADMA were synthesized in-house. Precision and accuracy of the method were better than 5% in plasma and urine quality control samples. First results obtained with this method in samples of healthy volunteers showed plasma levels of 0.643±0.454 nmol/L and urine levels of 152.7±76.7 nmol/L or 13.0±8.9 nmol/mmol creatinine. The method is a suitable tool for investigating this currently mostly neglected ADMA elimination pathway.
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Affiliation(s)
| | - Roman N Rodionov
- University Center for Vascular Medicine, University Hospital Carl Gustav Carus, Technical University, Dresden, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, 39120 Magdeburg, Germany
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Cui J, Zhang J, Zhu X, Bai F, Feng Y, Guan W, Cui Q. Separation and Quantification of Water-Soluble Cellular Metabolites inClostridium thermocellumusing Liquid Chromatography-Isotope Dilution Tandem Mass Spectrometry. ANAL LETT 2013. [DOI: 10.1080/00032719.2013.811680] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Opposite associations of plasma homoarginine and ornithine with arginine in healthy children and adolescents. Int J Mol Sci 2013; 14:21819-32. [PMID: 24192823 PMCID: PMC3856037 DOI: 10.3390/ijms141121819] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 09/20/2013] [Accepted: 10/09/2013] [Indexed: 11/17/2022] Open
Abstract
Homoarginine, a non-proteinogenic amino acid, is formed when lysine replaces ornithine in reactions catalyzed by hepatic urea cycle enzymes or lysine substitutes for glycine as a substrate of renal arginine:glycine amidinotransferase. Decreased circulating homoarginine and elevated ornithine, a downstream product of arginase, predict adverse cardiovascular outcome. Our aim was to investigate correlates of plasma homoarginine and ornithine and their relations with carotid vascular structure in 40 healthy children and adolescents aged 3–18 years without coexistent diseases or subclinical carotid atherosclerosis. Homoarginine, ornithine, arginine, asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) were measured by liquid chromatography-tandem mass spectrometry with stable isotope-labeled internal standards. Intima-media thickness (IMT) and extra-medial thickness (EMT) of common carotid arteries were estimated by B-mode ultrasound. Homoarginine correlated with arginine (r = 0.43, p = 0.005), age (r = 0.42, p = 0.007) and, weakly, with an increased arginine-to-ornithine ratio, a putative measure of lower arginase activity (r = 0.31, p = 0.048). Ornithine correlated inversely with arginine (r = −0.64, p < 0.001). IMT, EMT or their sum were unrelated to any of the biochemical parameters (p > 0.12). Thus, opposite associations of plasma homoarginine and ornithine with arginine may partially result from possible involvement of arginase, an enzyme controlling homoarginine degradation and ornithine synthesis from arginine. Age-dependency of homoarginine levels can reflect developmental changes in homoarginine metabolism. However, neither homoarginine nor ornithine appears to be associated with carotid vascular structure in healthy children and adolescents.
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Martens-Lobenhoffer J, Bode-Böger SM. Mass spectrometric quantification of L-arginine and its pathway related substances in biofluids: the road to maturity. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 964:89-102. [PMID: 24210895 DOI: 10.1016/j.jchromb.2013.10.030] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 10/17/2013] [Accepted: 10/19/2013] [Indexed: 11/18/2022]
Abstract
The amino acid L-arginine together with its metabolites and related substances is in the center of many biologically important pathways, especially the urea cycle and the nitric oxide (NO) synthesis. Therefore, the concentrations of these substances in various biological fluids are of great interest as predictive markers for health and disease. Yet, they provide major analytical difficulties as they are very polar in nature and therefore not easily to be separated on standard reversed phase HPLC stationary phases. Furthermore, as endogenous substances, no analyte-free matrix is available, a fact that results in complicated calibration procedures. This review evaluates the analytical literature for the determination of L-arginine, symmetric dimethylarginine, asymmetric dimethylarginine, monomethylarginine, L-citrulline, L-ornithine, L-homoarginine, agmatine and dimethylguanidinovaleric acid in biological fluids. Papers are discussed, which were published since 2007 and describe methods applying capillary electrophoresis (CE), gas chromatography (GC), reversed phase HPLC or polar phase HPLC, coupled to mass spectrometric quantification. Nowadays, many carefully developed and validated methods for L-arginine and its related substances are available to the scientific community. The use of stable isotope labeled internal standards enables high precision and accuracy in mass spectrometry-based quantitative analysis.
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Affiliation(s)
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Magdeburg, Germany
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Martens-Lobenhoffer J, Surdacki A, Bode-Böger SM. Fast and Precise Quantification of l-Homoarginine in Human Plasma by HILIC-Isotope Dilution-MS–MS. Chromatographia 2013. [DOI: 10.1007/s10337-013-2561-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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47
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Worthmann H, Martens-Lobenhoffer J, Joumaah M, Li N, Lichtinghagen R, Hecker H, Kielstein JT, Ehrenreich H, Bode-Böger SM, Weissenborn K. Asymmetric dimethylarginine in response to recombinant tissue-type plasminogen activator and erythropoietin in acute stroke. Stroke 2013; 44:2128-33. [PMID: 23788583 DOI: 10.1161/strokeaha.113.001145] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE In the German Multicenter Erythropoietin (EPO) Stroke Trial, patients not receiving thrombolysis most likely benefited from EPO on clinical recovery, whereas a combination of rtPA and EPO was associated with increased mortality. We investigated whether the combination of rtPA and EPO increased release of the endogenous NO synthase inhibitor asymmetric dimethylarginine (ADMA), and thereby potentially deteriorated ischemic stroke outcome, as suggested from experimental data. METHODS ADMA was determined in serum samples from 90 patients of the German Multicenter EPO Stroke Trial taken at days 1 (within 6 hours after symptom onset), 2, 3, 4, and 7 after stroke using high-performance liquid chromatography-tandem mass spectrometry. ADMA was analyzed for the different treatment groups (EPO, n=25; placebo, n=30; rtPA+placebo, n=18; EPO+rtPA, n=17). Clinical outcome was expressed as difference between National Institutes of Health Stroke Scale at baseline and 90 days. RESULTS ADMA levels significantly increased during the observation time in EPO, EPO+rtPA, and placebo groups (P<0.05). A treatment effect on ADMA levels was revealed by repeated measures ANOVA only in the rtPA+placebo group (P=0.027). Here, ADMA levels were decreased compared with the placebo group (P<0.05). Both the EPO and the rtPA+placebo groups in the Hannover subgroup of the EPO trial had better outcome than the placebo group (P<0.05). CONCLUSIONS Our data underscore the potential benefit of EPO in ischemic stroke. The hypothesis from experimental data, that EPO treatment increases ADMA in stroke patients, was disproved. Further studies are needed to clarify whether decreased ADMA might contribute to therapeutic rtPA effects.
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Affiliation(s)
- Hans Worthmann
- Department of Neurology, Hannover Medical School, Hannover, Germany
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Martens-Lobenhoffer J, Rodionov RN, Bode-Böger SM. Probing AGXT2 enzyme activity in mouse tissue by applying stable isotope-labeled asymmetric dimethyl arginine as substrate. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1594-1600. [PMID: 23280748 DOI: 10.1002/jms.3125] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 10/12/2012] [Accepted: 10/16/2012] [Indexed: 06/01/2023]
Abstract
Asymmetric dimethylarginine (ADMA) is a metabolite of the amino acid L-arginine. It competitively inhibits the enzymatic production of the cell-signaling substance nitric oxide. Therefore, increased levels of ADMA are associated with a range of cardiovascular and other diseases. ADMA is biologically eliminated by direct renal excretion and hydrolysis by the enzyme DDAH. Recently, a further elimination pathway via the transamination by the enzyme AGXT2 to α-keto-δ-(N(G),N(G)-dimethylguanidino)valeric acid (DMGV) has come into the focus of biological research. In this work, we describe an assay for the AGXT2 activity in mouse liver and kidney tissue. It is based on the transformation of isotope-labeled ADMA-d(6) to DMGV-d(6). The quantification of the DMGV-d(6) produced by this reaction in tissue homogenate samples was accomplished by chromatographic separation on a porous graphitic carbon column and tandem mass spectrometric detection. DMGV-d(6) with the deuterium labels in different molecular positions was used as internal standard. The overall production rates of DMGV-d(6) in mice were 195.37 pmol/min/mg total protein in liver and 85.21 pmol/min/mg total protein in kidney tissue, with coefficients of variation of 6.31% and 11.25%, respectively. This method can be applied as a tool for the characterization of the ADMA elimination by the AGXT2 pathway.
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Affiliation(s)
- Jens Martens-Lobenhoffer
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Str. 44, 39120, Magdeburg, Germany.
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Ng EWY, Lam HS, Ng PC, Poon TCW. Quantification of citrulline by parallel fragmentation monitoring--a novel method using graphitized carbon nanoparticles and MALDI-TOF/TOF mass spectrometry. Clin Chim Acta 2012; 420:121-7. [PMID: 23123829 DOI: 10.1016/j.cca.2012.10.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Accepted: 10/10/2012] [Indexed: 11/25/2022]
Abstract
BACKGROUND Selected reaction monitoring (SRM) is a reliable mass spectrometry (MS)-based technique for quantification of small molecules. However, it is not applicable to matrix-assisted laser desorption/ionization time-of-flight/time-of-flight tandem MS (MALDI-TOF/TOF MS) instruments. This work presents a novel comparable MALDI-TOF/TOF MS technique, "Parallel Fragmentation Monitoring" (PFM), for high-throughput quantification of citrulline. METHOD Calibrator/sample solutions were spiked with internal standard that was a stable isotopic analog with 1 mass unit heavier than citrulline. Both citrulline and internal standard were isolated and fragmented in parallel by MALDI-TOF/TOF MS in the presence of graphitized carbon nanoparticles as matrix. The ratio of the peak intensities of the selected fragment of citrulline to that of internal standard was used to calibrate/calculate the concentrations of citrulline in samples. RESULTS Linear calibration curves were obtained in the range of 10-250 μmol/l citrulline with correlation coefficients ≥0.997. Stored calibration curve and batch-specific calibration curve produced highly similar measurement values. Within- and between-day CVs were 3.1-8.7% and 3.5-10.6%, respectively, illustrating the reliability and robustness of PFM. CONCLUSION Using citrulline for proof-of-concept, we have developed the PFM technique with tremendous potential for high-throughput quantification of amino acids and other small molecules.
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Affiliation(s)
- Eddy Wing Yin Ng
- Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong SAR, China
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