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Durante W. Glutamine Deficiency Promotes Immune and Endothelial Cell Dysfunction in COVID-19. Int J Mol Sci 2023; 24:7593. [PMID: 37108759 PMCID: PMC10144995 DOI: 10.3390/ijms24087593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/17/2023] [Accepted: 04/19/2023] [Indexed: 04/29/2023] Open
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has caused the death of almost 7 million people worldwide. While vaccinations and new antiviral drugs have greatly reduced the number of COVID-19 cases, there remains a need for additional therapeutic strategies to combat this deadly disease. Accumulating clinical data have discovered a deficiency of circulating glutamine in patients with COVID-19 that associates with disease severity. Glutamine is a semi-essential amino acid that is metabolized to a plethora of metabolites that serve as central modulators of immune and endothelial cell function. A majority of glutamine is metabolized to glutamate and ammonia by the mitochondrial enzyme glutaminase (GLS). Notably, GLS activity is upregulated in COVID-19, favoring the catabolism of glutamine. This disturbance in glutamine metabolism may provoke immune and endothelial cell dysfunction that contributes to the development of severe infection, inflammation, oxidative stress, vasospasm, and coagulopathy, which leads to vascular occlusion, multi-organ failure, and death. Strategies that restore the plasma concentration of glutamine, its metabolites, and/or its downstream effectors, in conjunction with antiviral drugs, represent a promising therapeutic approach that may restore immune and endothelial cell function and prevent the development of occlusive vascular disease in patients stricken with COVID-19.
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Affiliation(s)
- William Durante
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65212, USA
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2
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Li H, Yang L, Jin Y, Jin C. Roles of Endothelial Motilin Receptor and Its Signal Transduction Pathway in Motilin-Induced Left Gastric Artery Relaxation in Dogs. Front Physiol 2021; 12:770430. [PMID: 34777026 PMCID: PMC8581264 DOI: 10.3389/fphys.2021.770430] [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: 09/03/2021] [Accepted: 10/05/2021] [Indexed: 12/04/2022] Open
Abstract
Background: Motilin increases left gastric artery (LGA) blood flow in dogs via the endothelial motilin receptor (MLNR). This article investigates the signaling pathways of endothelial MLNR. Methods: Motilin-induced relaxation of LGA rings was assessed using wire myography. Nitric oxide (NO), and cyclic guanosine monophosphate (cGMP) levels were measured using an NO assay kit and cGMP ELISA kit, respectively. Results: Motilin concentration-dependently (EC50=9.1±1.2×10−8M) relaxed LGA rings precontracted with U46619 (thromboxane A2 receptor agonist). GM-109 (MLNR antagonist) significantly inhibited motilin-induced LGA relaxation and the production of NO and cGMP. N-ethylmaleimide (NEM; G-protein antagonist), U73122 [phospholipase C (PLC) inhibitor], and 2-aminoethyl diphenylborinate [2-APB; inositol trisphosphate (IP3) blocker] partially or completely blocked vasorelaxation. In contrast, chelerythrine [protein kinase C (PKC) inhibitor] and H89 [protein kinase A (PKA) inhibitor] had no such effect. Low-calcium or calcium-free Krebs solutions also reduced vasorelaxation. N-nitro-L-arginine methyl ester [L-NAME; nitric oxide synthase (NOS) inhibitor] and ODQ [soluble guanylyl cyclase (sGC) inhibitor] completely abolished vasodilation and synthesis of NO and cGMP. Indomethacin (cyclooxygenase inhibitor), 18α-glycyrrhetinic acid [18α-GA; myoendothelial gap junction (MEGJ) inhibitor], and K+ channel inhibition through high K+ concentrations or tetraethylammonium (TEA-Cl; KCa channel blocker) partially decreased vasorelaxation, whereas glibenclamide (KATP channel blocker) had no such effect. Conclusion: The current study suggests that motilin-induced LGA relaxation is dependent on endothelial MLNR through the G protein-PLC-IP3 pathway and Ca2+ influx. The NOS-NO-sGC-cGMP pathway, prostacyclin, MEGJ, and K+ channels (especially KCa) are involved in endothelial-dependent relaxation of vascular smooth muscle (VSM) cells.
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Affiliation(s)
- HongYu Li
- Department of Ultrasound, China-Japan Union Hospital of Jilin University, Changchun, China.,Department of Ultrasound, The First Hospital of Jilin University, Changchun, China
| | - LanLan Yang
- Department of Ultrasound, China-Japan Union Hospital of Jilin University, Changchun, China.,Department of Hepatopancreatobiliary Medicine, The Second Hospital of Jilin University, Changchun, China
| | - Ying Jin
- Department of Breast Surgery, The First Hospital of Jilin University, Changchun, China
| | - ChunXiang Jin
- Department of Ultrasound, China-Japan Union Hospital of Jilin University, Changchun, China
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3
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Beutner F, Ritter C, Scholz M, Teren A, Holdt LM, Teupser D, Becker S, Thiele H, Gielen S, Thiery J, Ceglarek U. A metabolomic approach to identify the link between sports activity and atheroprotection. Eur J Prev Cardiol 2020; 29:436-444. [PMID: 33624084 DOI: 10.1093/eurjpc/zwaa122] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 09/15/2020] [Accepted: 11/10/2020] [Indexed: 12/11/2022]
Abstract
AIMS Physical activity (PA) is a mainstay of cardiovascular prevention. This study aimed to identify metabolic mediators of PA that protect against the development of atherosclerosis. METHODS AND RESULTS A total of 2160 participants in the LIFE heart study were analysed with data on PA and vascular phenotyping. In a targeted metabolomic approach, 61 metabolites (amino acids and acylcarnitines) were measured using liquid chromatography-tandem mass spectrometry. We investigated the interactions between PA, metabolites and markers of atherosclerosis in order to uncover possible mediation effects. Intended sports activity, but no daily PA, was associated with a lower degree of atherosclerosis, odds ratio (OR) for total atherosclerotic burden of 0.76 (95% confidence interval 0.62-0.94), carotid artery plaque OR 0.79 (0.66-0.96), and peripheral artery disease OR 0.74 (0.56-0.98). Twelve amino acids, free carnitine, five acylcarnitines were associated with sports activity. Of these, eight metabolites were also associated with the degree of atherosclerosis. In the mediation analyses, a cluster of amino acids (arginine, glutamine, pipecolic acid, taurine) were considered as possible mediators of atheroprotection. In contrast, a group of members of the carnitine metabolism (free carnitine, acetyl carnitine, octadecenoyl carnitine) were associated with inactivity and higher atherosclerotic burden. CONCLUSION Our metabolomic approach, which is integrated into a mediation model, provides transformative insights into the complex metabolic processes involved in atheroprotection. Metabolites with antioxidant and endothelial active properties are believed to be possible mediators of atheroprotection. The metabolomic mediation approach can support the understanding of complex diseases in order to identify targets for prevention and therapy.
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Affiliation(s)
- Frank Beutner
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Department of Internal Medicine/Cardiology, Heart Center Leipzig at University of Leipzig, 04289 Leipzig, Germany
| | - Christian Ritter
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany
| | - Markus Scholz
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Medical Informatics, Statistics and Epidemiology, University Leipzig, Leipzig, Germany
| | - Andrej Teren
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Department of Internal Medicine/Cardiology, Heart Center Leipzig at University of Leipzig, 04289 Leipzig, Germany
| | - Lesca Miriam Holdt
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Laboratory Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Daniel Teupser
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Laboratory Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Susen Becker
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Laboratory Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Holger Thiele
- Department of Internal Medicine/Cardiology, Heart Center Leipzig at University of Leipzig, 04289 Leipzig, Germany
| | - Stephan Gielen
- Department of Cardiology, Angiology and Intensive Care, Klinikum Lippe, Detmold, Germany
| | - Joachim Thiery
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Laboratory Medicine, University Hospital Leipzig, Leipzig, Germany
| | - Uta Ceglarek
- LIFE Research Center for Civilization Diseases, University Leipzig, Leipzig, Germany.,Institute of Laboratory Medicine, University Hospital Leipzig, Leipzig, Germany
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Zhao Y, Ge J, Li X, Guo Q, Zhu Y, Song J, Zhang L, Ding S, Yang X, Li R. Vasodilatory effect of formaldehyde via the NO/cGMP pathway and the regulation of expression of K ATP, BK Ca and L-type Ca 2+ channels. Toxicol Lett 2019; 312:55-64. [PMID: 30974163 DOI: 10.1016/j.toxlet.2019.04.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 03/28/2019] [Accepted: 04/06/2019] [Indexed: 12/12/2022]
Abstract
Formaldehyde (FA), a well-known toxic gas molecule similar to nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S), is widely produced endogenously via numerous biochemical pathways, and has a number of physiological roles in the biosystem. We attempted to investigate the vasorelaxant effects of FA and their underlying mechanisms. We found that FA induced vasorelaxant effects on rat aortic rings in a concentration-dependent manner. The NO/cyclic guanosine 5' monophosphate (cGMP) pathway was up-regulated when the rat aortas were treated with FA. The expression of large-conductance Ca2+-activated K+ (BKCa) channel subunits α and β of the rat aortas was increased by FA. Similarly, the levels of ATP-sensitive K+ (KATP) channel subunits Kir6.1 and Kir6.2 were also up-regulated when the rat aortas were incubated with FA. In contrast, levels of the L-type Ca2+ channel (LTCC) subunits, Cav1.2 and Cav1.3, decreased dramatically with increasing concentrations of FA. We demonstrated that the regulation of FA on vascular contractility may be via the up-regulation of the NO/cGMP pathway and the modulation of ion channels, including the upregulated expression of the KATP and BKCa channels and the inhibited expression of LTCCs. Further study is needed to explore the in-depth mechanisms of FA induced vasorelaxation.
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Affiliation(s)
- Yun Zhao
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China
| | - Jing Ge
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China
| | - Xiaoxiao Li
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China
| | - Qing Guo
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China; School of Public Health, Huazhong University of Science and Technology, Hangkong Road, Wuhan, 430030, PR China
| | - Yuqing Zhu
- Centre of Stem Cell and Regenerative medicine, School of Medicine, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, PR China
| | - Jing Song
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China
| | - Luoping Zhang
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Shumao Ding
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China
| | - Xu Yang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China.
| | - Rui Li
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, 152 Luoyu Road, Wuhan 430079, PR China.
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5
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Deidda M, Noto A, Bassareo PP, Cadeddu Dessalvi C, Mercuro G. Metabolomic Approach to Redox and Nitrosative Reactions in Cardiovascular Diseases. Front Physiol 2018; 9:672. [PMID: 29997515 PMCID: PMC6031070 DOI: 10.3389/fphys.2018.00672] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 05/15/2018] [Indexed: 11/16/2022] Open
Abstract
Metabolomics, also referred to as metabonomics, is one of the most recent innovative technologies in medicine. It offers a direct functional read-out of phenotypes by the detection, identification, and quantification of a large number of metabolites within a biological sample such as urine and blood. Metabolites (<1500 Da) represent the output of cellular metabolism, accounting for expression and activity of genes, transcripts, and proteins, and offering unique insights into small molecule regulation, which may uncover new biochemical patterns. Metabolomics research has considerable potential for translating the metabolic fingerprint into personalized therapeutic strategies. Within the field of interest, cardiovascular disease (CVD) is one of the most developed areas. However, CVD remains the leading cause of death worldwide with a marked increase in mortality rates over the past six decades. In this scenario, recent findings indicate the important role of redox and nitrosative (RN) reactions in CVD development and progression. RN reactions are generally involved in the homeostatic modulation of a wide number of cellular and organ functions. Conversely, the imbalance of these reactions may lead to a condition of allostasis that in turn can cause CVD. The aim of this review is to highlight how the use of metabolomics may be useful for the study of RN reactions related to CVD, providing a tool to understand the mechanisms underlying reactions that could lead to impaired ROS or RNS formation.
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Affiliation(s)
- Martino Deidda
- Department of Medical Sciences and Public Health, University of Cagliari, Sardinia, Italy
| | - Antonio Noto
- Department of Medical Sciences and Public Health, University of Cagliari, Sardinia, Italy
| | - Pier P Bassareo
- Department of Medical Sciences and Public Health, University of Cagliari, Sardinia, Italy
| | | | - Giuseppe Mercuro
- Department of Medical Sciences and Public Health, University of Cagliari, Sardinia, Italy
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6
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Maayah ZH, Abdelhamid G, Elshenawy OH, El-Sherbeni AA, Althurwi HN, McGinn E, Dawood D, Alammari AH, El-Kadi AOS. The Role of Soluble Epoxide Hydrolase Enzyme on Daunorubicin-Mediated Cardiotoxicity. Cardiovasc Toxicol 2017; 18:268-283. [DOI: 10.1007/s12012-017-9437-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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7
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Deidda M, Piras C, Cadeddu Dessalvi C, Locci E, Barberini L, Orofino S, Musu M, Mura MN, Manconi PE, Finco G, Atzori L, Mercuro G. Distinctive metabolomic fingerprint in scleroderma patients with pulmonary arterial hypertension. Int J Cardiol 2017; 241:401-406. [PMID: 28476520 DOI: 10.1016/j.ijcard.2017.04.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 03/29/2017] [Accepted: 04/07/2017] [Indexed: 01/03/2023]
Abstract
BACKGROUND Pulmonary arterial hypertension (PAH) in systemic sclerosis (SS) identifies a poor prognosis subset of patients. Recent studies suggested a "metabolic theory" on the development of pulmonary arterial hypertension. On this basis we performed a metabolomic study in order to evaluate whether differences in pulmonary arterial blood metabolites were identifiable in SS patients with increased pulmonary vascular resistance (PVR). METHODS We studied 18 SS patients (age 58.7±15.6years) free of pulmonary fibrosis who underwent a right heart catheterization (RHC). A blood sample was collected during the RHC in the distal peripheral circulation of the pulmonary arteries to perform the metabolomic analysis. RESULTS Based on PVR we divided the population into Group A (n=8; PVR=1.16±0.23WU) and Group B (n=10; PVR=2.67±0.67WU; p<0.001 vs Group A). No significant differences were identified in terms of anthropometric, clinical, echo and therapeutic characteristics. At RHC the 2 groups showed a difference in mean pulmonary pressure values (Group A: 20±4mmHg; Group B: 27±3.4mmHg; p=0.03), with mild PAH in Group B. We applied an OSC-PLS-DA with a clear clusterization; SSc patients with PAH showed an increase in acetate, alanine, lactate, and lipoprotein levels and a decrease in γ-aminobutyrate, arginine, betaine, choline, creatine, creatinine, glucose, glutamate, glutamine, glycine, histidine, phenylalanine, and tyrosine levels CONCLUSIONS: Our results suggest that, despite similar clinical and disease-related parameters, SSc patients who develop PAH have an unfavorable metabolic profile able to cause an impaired production of metabolites with protective effects on endothelial cells.
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Affiliation(s)
- Martino Deidda
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Cristina Piras
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Christian Cadeddu Dessalvi
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Emanuela Locci
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Luigi Barberini
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Susanne Orofino
- Intensive Care Unit, Azienda Ospedaliero-Universitaria di Cagliari, 09128, Cagliari, Italy
| | - Mario Musu
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Mario Nicola Mura
- Department of Internal Medicine, AOU di Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Paolo Emilio Manconi
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Gabriele Finco
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Luigi Atzori
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Cagliari, Italy
| | - Giuseppe Mercuro
- Department of Medical Sciences and Public Health, University of Cagliari, 09042 Monserrato, Cagliari, Italy.
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Schachter D, Buteau J. Glutamate formation via the leucine-to-glutamate pathway of rat pancreas. Am J Physiol Gastrointest Liver Physiol 2014; 306:G938-46. [PMID: 24699330 DOI: 10.1152/ajpgi.00394.2013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The leucine-to-glutamate (Leu→Glu) pathway, which metabolizes the carbon atoms of l-leucine to form l-glutamate, was studied by incubation of rat tissue segments with l-[U-(14)C]leucine and estimation of the [(14)C]glutamate formed. Metabolism of the leucine carbon chain occurs in most rat tissues, but maximal activity of the Leu→Glu pathway for glutamate formation is limited to the thoracic aorta and pancreas. In rat aorta, the Leu→Glu pathway functions to relax the underlying smooth muscle; its functions in the pancreas are unknown. This report characterizes the Leu→Glu pathway of rat pancreas and develops methods to examine its functions. Pancreatic segments effect net formation of glutamate on incubation with l-leucine, l-glutamine, or a mix of 18 other plasma amino acids at their concentrations in normal rat plasma. Glutamate formed from leucine remains mainly in the tissue, whereas that from glutamine enters the medium. The pancreatic Leu→Glu pathway uses the leucine carbons for net glutamate formation; the α-amino group is not used; the stoichiometry is as follows: 1 mol of leucine yields 2 mol of glutamate (2 leucine carbons per glutamate) plus 2 mol of CO2. Comparison of the Leu→Glu pathway in preparations of whole pancreatic segments, isolated acini, and islets of Langerhans localizes it in the acini; relatively high activity is found in cultures of the AR42J cell line and very little in the INS-1 832/13 cell line. Pancreatic tissue glutamate concentration is homeostatically regulated in the range of ∼1-3 μmol/g wet wt. l-Valine and leucine ethyl, benzyl, and tert-butyl esters inhibit the Leu→Glu pathway without decreasing tissue total glutamate.
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Affiliation(s)
- David Schachter
- Department of Physiology and Cellular Biophysics, Columbia University College of Physicians and Surgeons, New York, New York; and
| | - Jean Buteau
- Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York, and University of Alberta, Edmonton, Alberta, Canada
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9
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Addabbo F, Chen Q, Patel DP, Rabadi M, Ratliff B, Zhang F, Jasmin JF, Wolin M, Lisanti M, Gross SS, Goligorsky MS. Glutamine supplementation alleviates vasculopathy and corrects metabolic profile in an in vivo model of endothelial cell dysfunction. PLoS One 2013; 8:e65458. [PMID: 23776484 PMCID: PMC3679132 DOI: 10.1371/journal.pone.0065458] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 04/25/2013] [Indexed: 02/07/2023] Open
Abstract
Endothelial Cell Dysfunction (ECD) is a recognized harbinger of a host of chronic cardiovascular diseases. Using a mouse model of ECD triggered by treatment with L-Nω-methylarginine (L-NMMA), we previously demonstrated that renal microvasculature displays a perturbed protein profile, including diminished expression of two key enzymes of the Krebs cycle associated with a Warburg-type suppression of mitochondrial metabolism. We hypothesized that supplementation with L-glutamine (GLN), that can enter the Krebs cycle downstream this enzymatic bottleneck, would normalize vascular function and alleviate mitochondrial dysfunction. To test this hypothesis, mice with chronic L-NMMA-induced ECD were co-treated with GLN at different concentrations for 2 months. Results confirmed that L-NMMA led to a defect in acetylcholine-induced relaxation of aortic rings that was dose-dependently prevented by GLN. In caveolin-1 transgenic mice characterized by eNOS inactivation, L-NMMA further impaired vasorelaxation which was partially rescued by GLN co-treatment. Pro-inflammatory profile induced by L-NMMA was blunted in mice co-treated with GLN. Using an LC/MS platform for metabolite profiling, we sought to identify metabolic perturbations associated with ECD and offset by GLN supplementation. 3453 plasma molecules could be detected with 100% frequency in mice from at least one treatment group. Among these, 37 were found to be differentially expressed in a 4-way comparison of control vs. LNMMA both with and without GLN. One of such molecules, hippuric acid, an “uremic toxin” was found to be elevated in our non-uremic mice receiving L-NMMA, but normalized by treatment with GLN. Ex vivo analysis of hippuric acid effects on vasomotion demonstrated that it significantly reduced acetylcholine-induced vasorelaxation of vascular rings. In conclusion, functional and metabolic profiling of animals with early ECD revealed macrovasculopathy and that supplementation GLN is capable of improving vascular function. Metabolomic analyses reveal elevation of hippuric acid, which may further exacerbate vasculopathy even before the development of uremia.
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Affiliation(s)
- Francesco Addabbo
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
- Department of Experimental Immunopathology, National Institute of Gastroenterology, IRCCS “S. De Bellis” Castellana Grotte, Italy
- * E-mail: (FA); (MSG)
| | - Qiuying Chen
- Department of Pharmacology, Weill Cornell Medical College, New York, New York, United States of America
| | - Dhara P. Patel
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
| | - May Rabadi
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
| | - Brian Ratliff
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
| | - Frank Zhang
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
| | - Jean-Francois Jasmin
- Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Michael Wolin
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
| | - Michael Lisanti
- Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- Breakthrough Breast Cancer Research Unit, University of Manchester, United Kingdom
| | - Steven S. Gross
- Department of Pharmacology, Weill Cornell Medical College, New York, New York, United States of America
| | - Michael S. Goligorsky
- Departments of Medicine, Pharmacology and Physiology, New York Medical College, Valhalla, New York, United States of America
- * E-mail: (FA); (MSG)
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10
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Li J, Li R, Meng Z. Sulfur dioxide upregulates the aortic nitric oxide pathway in rats. Eur J Pharmacol 2010; 645:143-50. [PMID: 20674563 DOI: 10.1016/j.ejphar.2010.07.034] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2010] [Revised: 06/10/2010] [Accepted: 07/15/2010] [Indexed: 10/19/2022]
Abstract
Sulfur dioxide (SO(2)) is a common gaseous pollutant. It is also, however, endogenously generated from sulfur-containing amino acids. Recent studies have demonstrated that rat blood pressure can be lowered by SO(2)-exposure in vivo and that vasodilation caused by SO(2) at low concentrations (<450 microM) is endothelium-dependent in rat aorta. However, effects of SO(2) on nitric oxide synthase (NOS) and nitric oxide (NO) production have not been previously studied in rat aorta. The objective of the present study is to assess the effects of acute (10 min) and prolonged (2h) stimulation with different concentrations of SO(2) on NO/cGMP pathway in isolated rat aorta. The results show that: (1) the acute and prolonged pretreatments with SO(2) produced an inhibition of vasoconstrictions induced by norepinephrine. (2) SO(2) potentiated activity of endothelial nitric oxide synthase (eNOS), but not of induced NOS (iNOS). (3) SO(2) could increase expression of eNOS gene on the transcription and translation levels in rat aorta. (4) SO(2) enhanced NO formation in aortic tissue. (5) The level of cGMP in rat aorta was increased by SO(2) and no change of cAMP. These findings led to the conclusion: there were acute and prolonged effects of SO(2) on the NO/cGMP signalling pathway; and SO(2) could upregulate the eNOS-NO-cGMP pathway and at least partly by which the SO(2) might cause vasodilation and inhibition to vasoconstriction.
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Affiliation(s)
- Junling Li
- School of Physical Education, Shanxi University of Finance and Economics, Taiyuan 030006, China
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11
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Development of a High Throughput Cell-Based Assay for Soluble Epoxide Hydrolase Using BacMam Technology. Mol Biotechnol 2010; 45:207-17. [DOI: 10.1007/s12033-010-9271-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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12
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Kaspera R, Totah RA. Epoxyeicosatrienoic acids: formation, metabolism and potential role in tissue physiology and pathophysiology. Expert Opin Drug Metab Toxicol 2010; 5:757-71. [PMID: 19505190 DOI: 10.1517/17425250902932923] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND CYP enzymes from the CYP2C and CYP2J subfamilies metabolize arachidonic acid in a regiospecific and stereoselective manner to eight epoxyeicosatrienoic acids (EETs). Various EETs have been detected in the liver, as well as in many extrahepatic tissues, and have been implicated in numerous physiological functions from cell signaling to vasodilation and angiogenesis. OBJECTIVE This report reviews the sites of expression and activity of arachidonic acid epoxygenase CYP isoforms, as well as the physiological role and metabolism of EETs in various extrahepatic tissues. Possible functions of EETs in tissue pathophysiology and implications as potential drug targets are also discussed. METHODS The most recent primary research literature on EET forming enzymes and the new physiological functions of EETs in various tissues were reviewed. RESULTS/CONCLUSIONS Epoxyeicosatrienoic acids are important in maintaining the homeostasis and in responding to stress in various extra hepatic tissues. It is not clear whether these effects are owing to EETs acting on a universal receptor or through a mechanism involving a second messenger. A better understanding of the regulation of EET levels and their mechanism of action on various receptors will accelerate research aiming at developing therapeutic agents that target EET formation or metabolism pathways.
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Affiliation(s)
- Rüdiger Kaspera
- University of Washington, Department of Medicinal Chemistry, Seattle, WA 98195, USA
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Honda M, Nozawa Y, Ishizaki T, Kuroda M. Ingestion of bonito extract ameliorates peripheral blood flow in mice loaded from over crowding stress. ACTA ACUST UNITED AC 2009; 30:129-35. [PMID: 19420737 DOI: 10.2220/biomedres.30.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Bonito extract (BE) has been shown to improve various fatigue-related symptoms. The possibility that the improvement of blood flow contributes to the improvement of fatigue-related symptoms has been reported. However, even though BE has been found to increase peripheral blood flow in humans, an understanding of its mechanisms has remained elusive. The purpose of the present study is to construct an animal model system with which the blood flow-increasing effects of BE can be examined. Using mice loaded with crowding stress, an attempt was made to reproduce the increases in peripheral blood flow observed in humans after a single administration of BE. In this study, the crowded-condition mice (20 mice/cage) showed significantly increased catecholamine levels (noradrenaline, adrenaline, and dopamine) in their circulating blood and a decreased rate of skin blood perfusion in comparison with the normal-condition mice (6 mice/cage). The rate of skin blood perfusion was significantly increased by BE in the crowded-condition mice in comparison with the controls, but not influenced by BE in the normal-condition mice. This suggests that BE expands the vascular diameter by affecting the constriction of vessels induced by catecholamines.
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Affiliation(s)
- Masashi Honda
- Research Institute for Health Fundamentals, Ajinomoto Co., Inc
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