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Iritas SB, Dip A, Gunduzoz M, Tutkun L, Turksoy VA, Deniz S, Tekin G, Oztan O, Unlu A. Assessment of potential cardiovascular risk in trichloroethylene exposure by serum methylated arginine levels. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2021; 31:63-74. [PMID: 31232082 DOI: 10.1080/09603123.2019.1628927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 06/04/2019] [Indexed: 06/09/2023]
Abstract
Trichloroethylene (TCE) is a widely used solvent in industrial applications and has toxic effects on various systems. Methylated arginine amino acids (eg asymmetric dimethyl arginine (ADMA), symmetric dimethyl arginine (SDMA)) cause the development of cardiovascular disease by inhibiting NO synthesis, which is considered to be heart-protector. The aim of this study is to determine the risk of cardiovascular diseases in TCE exposure by methylated arginine biomarkers. About 98 controls and 100 TCE-exposed male subjects were included in the study. Trichloroacetic acid (urinary metabolite of TCE), arginine, homoarginine, citrulline ADMA, SDMA, and N-monomethyl L-arginine (L-NMMA) levels were found significantly higher than control group (p < 0.001). The strongest correlation was found between ADMA and Trichloroacetic acid (TCA) level (r = 0.453, p < 0.01). Long-term TCE exposure, may be an important risk factor for cardiovascular diseases by increasing methylated arginine levels.
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Affiliation(s)
- Servet Birgin Iritas
- Department of Ankara Branch Directorate, The Council of Forensic Medicine , Ankara, Turkey
| | - Aybike Dip
- Department of Chemistry, The Council of Forensic Medicine , Adana, Turkey
| | - Meside Gunduzoz
- Department of Family Medicine, Ankara Occupational Diseases Hospital Ankara , Turkey
| | - Lutfiye Tutkun
- Department of Biochemistry, Yozgat Bozok University Faculty of Medicine , Yozgat, Turkey
| | - Vugar Ali Turksoy
- Department of Public Health , Yozgat Bozok University Faculty of Medicine, Yozgat, Turkey
| | - Serdar Deniz
- Unit of Community Health Center, Provincial Health Directorate , Malatya, Turkey
| | - Gulsum Tekin
- Vocational School of Health Sciences, Selcuk University , Konya, Turkey
| | - Ozgur Oztan
- Department of Medical Management, HLC Medical Center , Ankara, Turkey
| | - Ali Unlu
- Department of Biochemistry, Selcuk University Faculty of Medicine , Konya, Turkey
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2
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ADMA: A Key Player in the Relationship between Vascular Dysfunction and Inflammation in Atherosclerosis. J Clin Med 2020; 9:jcm9093026. [PMID: 32962225 PMCID: PMC7563400 DOI: 10.3390/jcm9093026] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 09/16/2020] [Accepted: 09/17/2020] [Indexed: 02/07/2023] Open
Abstract
Atherosclerosis is a chronic cardiovascular disease which increases risk of major cardiovascular events including myocardial infarction and stroke. Elevated plasma concentrations of asymmetric dimethylarginine (ADMA) have long been recognised as a hallmark of cardiovascular disease and are associated with cardiovascular risk factors including hypertension, obesity and hypertriglyceridemia. In this review, we discuss the clinical literature that link ADMA concentrations to increased risk of the development of atherosclerosis. The formation of atherosclerotic lesions relies on the interplay between vascular dysfunction, leading to endothelial activation and the accumulation of inflammatory cells, particularly macrophages, within the vessel wall. Here, we review the mechanisms through which elevated ADMA contributes to endothelial dysfunction, activation and reactive oxygen species (ROS) production; how ADMA may affect vascular smooth muscle phenotype; and finally whether ADMA plays a regulatory role in the inflammatory processes occurring within the vessel wall.
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3
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Cheng P, Pan J, Xia J, Huang W, Bai S, Zhu X, Shao W, Wang H, Xie P, Deng F. Dietary cholesterol intake and stroke risk: a meta-analysis. Oncotarget 2018; 9:25698-25707. [PMID: 29876017 PMCID: PMC5986647 DOI: 10.18632/oncotarget.23933] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 11/03/2017] [Indexed: 01/11/2023] Open
Abstract
Background/Objectives The association between dietary cholesterol and stroke risk has remained controversial over the past two decades. The aim of this meta-analysis was to assess the relationship between dietary cholesterol and stroke risk. Results Seven prospective studies including 269,777 non-overlapping individuals (4,604 strokes) were included. The combined RR of stroke for higher cholesterol intake (> 300 mg/day) was 0.98 (95% CI, 0.90–1.07), and the combined RR of stroke for higher cholesterol intake (> 300 mg/day) in females (age of ≥ 60 years or body mass index of ≥ 24 kg/m2) was 1.18 (95% CI, 1.02–1.36). Materials and Methods The PubMed, Medline, Embase, Web of Knowledge, and Google Scholar databases were searched. Relevant studies were identified by searching these online databases through September 2017. The relative risk (RR) and 95% confidence interval (CI) were used to investigate the strength of the association. Conclusions Higher cholesterol intake has no association with the overall stroke risk. Age and body mass index affect the relationship between dietary cholesterol intake and stroke risk. However, the association between higher dietary cholesterol and stroke risk in males remains unclear.
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Affiliation(s)
- Pengfei Cheng
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.,Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China.,Department of Neurology, The First Affiliated Hospital of Jiamusi University, Jiamusi, Heilongjiang Province, 154002, China
| | - Junxi Pan
- Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China.,The M.O.E. Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China
| | - Jinjun Xia
- Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China.,The M.O.E. Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China
| | - Wen Huang
- Department of Neurology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Shunjie Bai
- Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China.,The M.O.E. Key Laboratory of Laboratory Medical Diagnostics, The College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China
| | - Xiaofeng Zhu
- Institute of Neuroscience, Jiamusi University, Jiamusi, Heilongjiang Province, 154002, China
| | - Weihua Shao
- Department of Respiratory Medicine, The First Affiliated Hospital, Chongqing Medical University, Chongqing, 400016, China
| | - Haiyang Wang
- Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China
| | - Peng Xie
- Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.,Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China
| | - Fengli Deng
- Chongqing Key Laboratory of Neurobiology, Chongqing, 400016, China.,Institute of Neuroscience and The Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing, 400016, China
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Grandvuillemin I, Buffat C, Boubred F, Lamy E, Fromonot J, Charpiot P, Simoncini S, Sabatier F, Dignat-George F, Peyter AC, Simeoni U, Yzydorczyk C. Arginase upregulation and eNOS uncoupling contribute to impaired endothelium-dependent vasodilation in a rat model of intrauterine growth restriction. Am J Physiol Regul Integr Comp Physiol 2018; 315:R509-R520. [PMID: 29741931 DOI: 10.1152/ajpregu.00354.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Individuals born after intrauterine growth restriction (IUGR) are at increased risk of developing cardiovascular diseases in adulthood, notably hypertension (HTN). Alterations in the vascular system, particularly impaired endothelium-dependent vasodilation, may play an important role in long-term effects of IUGR. Whether such vascular dysfunction precedes HTN has not been fully established in individuals born after IUGR. Moreover, the intimate mechanisms of altered endothelium-dependent vasodilation remain incompletely elucidated. We therefore investigated, using a rat model of IUGR, whether impaired endothelium-dependent relaxation precedes the development of HTN and whether key components of the l-arginine-nitric oxide (NO) pathway are involved in its pathogenesis. Pregnant rats were fed with a control (CTRL, 23% casein) or low-protein diet (LPD, 9% casein) to induce IUGR. Systolic blood pressure (SBP) was measured by tail-cuff plethysmography in 5- and 8-wk-old male offspring. Aortic rings were isolated to investigate relaxation to acetylcholine, NO production, endothelial NO synthase (eNOS) protein content, arginase activity, and superoxide anion production. SBP was not different at 5 wk but significantly increased in 8-wk-old offspring of maternal LPD (LP) versus CTRL offspring. In 5-wk-old LP versus CTRL males, endothelium-dependent vasorelaxation was significantly impaired but restored by preincubation with l-arginine or the arginase inhibitor S-(2-boronoethyl)-l-cysteine; NO production was significantly reduced but restored by l-arginine pretreatment; total eNOS protein, dimer-to-monomer ratio, and arginase activity were significantly increased; superoxide anion production was significantly enhanced but normalized by pretreatment with the NO synthase inhibitor Nω-nitro-l-arginine. In this model, IUGR leads to early-impaired endothelium-dependent vasorelaxation, resulting from arginase upregulation and eNOS uncoupling, which precedes the development of HTN.
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Affiliation(s)
- Isabelle Grandvuillemin
- Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Centre de Recherche en Cardiovasculaire et Nutrition (C2VN), Aix Marseille University, Marseille, France.,Department of Neonatology, Assistance Publique Hôpitaux de Marseille (APHM), Centre Hospitalier Universitaire (CHU) La Conception, Marseille, France
| | - Christophe Buffat
- Unité de Recherche sur les Maladies Infectieuses Tropicales, Emergentes, Laboratory of Biochimical and Molecular Biology, Centre National de la Recherche Scientifique (CNRS), APHM, CHU la Conception, Aix Marseille University, Marseille, France
| | - Farid Boubred
- Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Centre de Recherche en Cardiovasculaire et Nutrition (C2VN), Aix Marseille University, Marseille, France.,Department of Neonatology, Assistance Publique Hôpitaux de Marseille (APHM), Centre Hospitalier Universitaire (CHU) La Conception, Marseille, France
| | - Edouard Lamy
- CNRS, Inst Movement Sci (ISM); Service Central de la Qualité et de l'Information Pharmaceutiques, APHM, Aix-Marseille University, Marseille, France
| | - Julien Fromonot
- UMR MD2 and Institute of Biological Research French Defense Ministry (IRBA), Aix-Marseille University, Marseille, France
| | - Philippe Charpiot
- CNRS, Inst Movement Sci (ISM); Service Central de la Qualité et de l'Information Pharmaceutiques, APHM, Aix-Marseille University, Marseille, France
| | - Stephanie Simoncini
- Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Centre de Recherche en Cardiovasculaire et Nutrition (C2VN), Aix Marseille University, Marseille, France
| | - Florence Sabatier
- Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Centre de Recherche en Cardiovasculaire et Nutrition (C2VN), Aix Marseille University, Marseille, France
| | - Françoise Dignat-George
- Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Centre de Recherche en Cardiovasculaire et Nutrition (C2VN), Aix Marseille University, Marseille, France
| | - Anne-Christine Peyter
- Neonatal Research Laboratory, Clinic of Neonatology, Department Woman-Mother-Child, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, Lausanne, Switzerland
| | - Umberto Simeoni
- Developmental Origins of Health and Disease (DOHaD) Laboratory, Division of Pediatrics, Department Woman-Mother-Child, CHUV, University of Lausanne, Lausanne, Switzerland
| | - Catherine Yzydorczyk
- Developmental Origins of Health and Disease (DOHaD) Laboratory, Division of Pediatrics, Department Woman-Mother-Child, CHUV, University of Lausanne, Lausanne, Switzerland
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5
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Endothelial dysfunction in individuals born after fetal growth restriction: cardiovascular and renal consequences and preventive approaches. J Dev Orig Health Dis 2017; 8:448-464. [PMID: 28460648 DOI: 10.1017/s2040174417000265] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Individuals born after intrauterine growth restriction (IUGR) have an increased risk of perinatal morbidity/mortality, and those who survive face long-term consequences such as cardiovascular-related diseases, including systemic hypertension, atherosclerosis, coronary heart disease and chronic kidney disease. In addition to the demonstrated long-term effects of decreased nephron endowment and hyperactivity of the hypothalamic-pituitary-adrenal axis, individuals born after IUGR also exhibit early alterations in vascular structure and function, which have been identified as key factors of the development of cardiovascular-related diseases. The endothelium plays a major role in maintaining vascular function and homeostasis. Therefore, it is not surprising that impaired endothelial function can lead to the long-term development of vascular-related diseases. Endothelial dysfunction, particularly impaired endothelium-dependent vasodilation and vascular remodeling, involves decreased nitric oxide (NO) bioavailability, impaired endothelial NO synthase functionality, increased oxidative stress, endothelial progenitor cells dysfunction and accelerated vascular senescence. Preventive approaches such as breastfeeding, supplementation with folate, vitamins, antioxidants, L-citrulline, L-arginine and treatment with NO modulators represent promising strategies for improving endothelial function, mitigating long-term outcomes and possibly preventing IUGR of vascular origin. Moreover, the identification of early biomarkers of endothelial dysfunction, especially epigenetic biomarkers, could allow early screening and follow-up of individuals at risk of developing cardiovascular and renal diseases, thus contributing to the development of preventive and therapeutic strategies to avert the long-term effects of endothelial dysfunction in infants born after IUGR.
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6
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Asymmetric Dimethylarginine (ADMA) in cardiovascular and renal disease. Clin Chim Acta 2015; 440:36-9. [DOI: 10.1016/j.cca.2014.11.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 10/22/2014] [Accepted: 11/02/2014] [Indexed: 11/16/2022]
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7
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Landim MBP, Dourado PMM, Casella-Filho A, Chagas ACP, da-Luz PL. High plasma concentrations of asymmetric dimethylarginine inhibit ischemic cardioprotection in hypercholesterolemic rats. Braz J Med Biol Res 2013; 46:454-9. [PMID: 23681289 PMCID: PMC3854396 DOI: 10.1590/1414-431x20132595] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 01/29/2013] [Indexed: 11/22/2022] Open
Abstract
A low concentration of nitric oxide associated with a high concentration of
asymmetric dimethylarginine (ADMA) can explain the lack of ischemic
cardioprotection observed in the presence of hypercholesterolemia. The objective
of the present study was to evaluate the effect of hypercholesterolemia on
ischemic pre- and postconditioning and its correlation with plasma
concentrations of ADMA. Male Wistar rats (6-8 weeks old) fed a 2%
cholesterol diet (n = 21) for 8 weeks were compared to controls (n
= 25) and were subjected to experimental myocardial infarction and
reperfusion, with ischemic pre- and postconditioning. Total cholesterol and ADMA
were measured in plasma before the experimental infarct and the infarct area was
quantified. Weight, total cholesterol and plasma ADMA (means ± SE; 1.20
± 0.06, 1.27 ± 0.08 and 1.20 ± 0.08 vs
0.97 ± 0.04, 0.93 ± 0.05 and 0.97 ± 0.04 µM)
were higher in animals on the hypercholesterolemic diet than in controls,
respectively. Cardioprotection did not reduce infarct size in the
hypercholesterolemic animals (pre: 13.55% and post: 8% compared to
7.95% observed in the group subjected only to ischemia and reperfusion),
whereas infarct size was reduced in the animals on a normocholesterolemic diet
(pre: 8.25% and post: 6.10% compared to 12.31%).
Hypercholesterolemia elevated ADMA and eliminated the cardioprotective effects
of ischemic pre- and postconditioning in rats.
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Affiliation(s)
- M B P Landim
- Unidade de Aterosclerose, Instituto do Coração, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
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8
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Noh JS, Choi YH, Song YO. Beneficial effects of the active principle component of Korean cabbage kimchi via increasing nitric oxide production and suppressing inflammation in the aorta of apoE knockout mice. Br J Nutr 2013; 109:17-24. [PMID: 22715945 DOI: 10.1017/s0007114512000633] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The present study investigated the effects of 3'-(4'-hydroxyl-3',5'-dimethoxyphenyl)propionic acid (HDMPPA), the active principle compound of kimchi, on vascular damage in the experimental atherosclerotic animal. HDMPPA was administrated by an intraperitoneal injection of 10 mg/kg per d for 8 weeks to apoE knockout (KO) mice with an atherogenic diet containing 1 % cholesterol, and its effects were compared with vehicle-treated control mice. HDMPPA increased NO content in the aorta, accompanied by a decrease in reactive oxygen species (ROS) concentration. Furthermore, in the HDMPPA-treated group, aortic endothelial NO synthase (eNOS) expression was up-regulated compared with the control group. These results suggested that HDMPPA could maintain NO bioavailability through an increasing eNOS expression and preventing NO degradation by ROS. Furthermore, HDMPPA treatment in apoE KO mice inhibited eNOS uncoupling through an increase in vascular tetrahydrobiopterin content and a decrease in serum asymmetric dimethylarginine levels. Moreover, HDMPPA ameliorates inflammatory-related protein expression in the aorta of apoE KO mice. Therefore, the present study suggests that HDMPPA, the active compound of kimchi, a Korean functional food, may exert its vascular protective effect through the preservation of NO bioavailability and suppression of the inflammatory response.
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Affiliation(s)
- Jeong Sook Noh
- Department of Food Science and Nutrition, Kimchi Research Institute, Pusan National University, Busan 609-735, Republic of Korea
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9
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Abstract
Atherosclerosis is a chronic inflammatory process in the intima of conduit arteries, which disturbs the endothelium-dependent regulation of the vascular tone by the labile liposoluble radical nitric oxide (NO) formed by the constitutive endothelial nitric oxide synthase (eNOS). This defect predisposes to coronary vasospasm and cardiac ischaemia, with anginal pain as the typical clinical manifestation. It is now appreciated that endothelial dysfunction is an early event in atherogenesis and that it may also involve the microcirculation, in which atherosclerotic lesions do not develop. On the other hand, the inflammatory environment in atherosclerotic plaques may result in the expression of the inducible NO synthase (iNOS) isozyme. Whether the dysfunction in endothelial NO production is causal to, or the result of, atherosclerotic lesion formation is still highly debated. Most evidence supports the hypothesis that constitutive endothelial NO release protects against atherogenesis e.g. by preventing smooth muscle cell proliferation and leukocyte adhesion. Nitric oxide generated by the inducible isozyme may be beneficial by replacing the failing endothelial production but excessive release may damage the vascular wall cells, especially in combination with reactive oxygen intermediates.
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Affiliation(s)
- K E Matthys
- University of Antwerp (UIA) Division of Pharmacology Wilrijk Antwerp B2610 Belgium
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10
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The effect of simvastatin on asymmetric dimethylarginine and flow-mediated vasodilation after optimizing the LDL level — A randomized, placebo-controlled study. Vascul Pharmacol 2012; 56:122-30. [DOI: 10.1016/j.vph.2011.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 10/02/2011] [Accepted: 10/30/2011] [Indexed: 01/06/2023]
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11
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Sun L, Zhang T, Yu X, Xin W, Lan X, Zhang D, Huang C, Du G. Asymmetric dimethylarginine confers the communication between endothelial and smooth muscle cells and leads to VSMC migration through p38 and ERK1/2 signaling cascade. FEBS Lett 2011; 585:2727-34. [DOI: 10.1016/j.febslet.2011.07.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 07/26/2011] [Accepted: 07/26/2011] [Indexed: 10/17/2022]
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12
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El-Kirsh AAA, Abd El-Wahab HMF, Abd-Ellah Sayed HF. The effect of L-arginine or L-citrulline supplementation on biochemical parameters and the vascular aortic wall in high-fat and high-cholesterol-fed rats. Cell Biochem Funct 2011; 29:414-28. [PMID: 21638297 DOI: 10.1002/cbf.1766] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2010] [Revised: 04/09/2011] [Accepted: 04/12/2011] [Indexed: 11/06/2022]
Abstract
The aim of the present study is to investigate the potential role of L-arginine or L-citrulline in rats fed high-fat and high-cholesterol (HFC) diet. HFC feeding increased significantly serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities, urea and all lipid profiles and decreased significantly serum high-density lipoprotein-cholesterol (HDL-c) and non significantly serum nitric oxide levels. L-arginine or L-citrulline administration reversed the increase in serum AST and ALT activities, urea and all lipid profiles. These effects were associated with a concomitant increase in HDL-c and nitric oxide levels. In general, rats fed HFC diet and orally treated with L-arginine or L-citrulline had higher relative percentage of 18:0, 20:0 and 22:6 and lower 16:0 fatty acids than rats fed HFC diet. Light and transmission electron microscopic findings of the thoracic aorta confirmed the biochemical results and demonstrated structural changes in the endothelial cells of the intimal layer, medial smooth muscle cells as well as in the adventitial layer in HFC fed-animals. However, these findings indicate little structural alterations in animals supplemented with L-arginine or L-citrulline along with HFC feeding. In the present study, L-arginine or L-citrulline was effective hypocholesterolemic and hypolipidemic agents in rats.
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13
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Feng M, He ZM, Zhu YX, Liu LH, Lu CW, Xiong Y. Improvement of endothelial dysfunction in atherosclerotic rabbit aortas by ex vivo gene transferring of dimethylarginine dimethylaminohydrolase-2. Int J Cardiol 2010; 144:180-6. [DOI: 10.1016/j.ijcard.2010.04.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2009] [Revised: 01/25/2010] [Accepted: 04/03/2010] [Indexed: 10/19/2022]
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14
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Vladimirova-Kitova LG, Terzieva DD, Nikolov FP. Asymmetric dimethylarginine determines the effect of simvastatin on endothelium-dependent vasodilation in severe hypercholesterolemia. ACTA ACUST UNITED AC 2010. [DOI: 10.2217/clp.09.76] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Jia SJ, Zhou Z, Zhang BK, Hu ZW, Deng HW, Li YJ. Asymmetric dimethylarginine damages connexin43-mediated endothelial gap junction intercellular communication. Biochem Cell Biol 2009; 87:867-74. [PMID: 19935872 DOI: 10.1139/o09-042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Asymmetric dimethylarginine (ADMA), a major endogenous inhibitor of nitric oxide synthase, is recently defined as a novel atherogenic factor. Communication via gap junction (GJIC) is involved in the regulation of a variety of endothelial activities, such as cell differentiation and senescence. The aim of this study is to explore the effects of ADMA on connexin43 (Cx43) mediated endothelial GJIC. Lysophosphatidylcholine (LPC) caused the downregulation of Cx43 expression and GJIC dysfunction in cultured human umbilical vein endothelial cells (HUVECs), which were significantly ameliorated by decreasing ADMA accumulation. Furthermore, we found that ADMA (10 µmol·L–1, 24 h) markedly downregulated Cx43 expression and damaged GJIC function in HUVECs. ADMA also increased production of intracellular reactive oxygen species (ROS) and induced phosphorylation of p38 MAPK. Furthermore, the inhibitory effect of ADMA on Cx43-mediated GJIC could be attenuated by NADPH oxidase inhibitor diphenyleneiodonium and apocynin as well as p38 MAPK inhibitor SB203580, respectively. In conclusion, our present results suggest that ADMA inhibits endothelial GJIC function via downregulating Cx43 expression, which suggesting a novel mechanism linking between elevated ADMA level and progression of atherosclerosis.
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Affiliation(s)
- Su-Jie Jia
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
| | - Zhi Zhou
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
| | - Bi-Kui Zhang
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
| | - Zhuo-Wei Hu
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
| | - Han-Wu Deng
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
| | - Yuan-Jian Li
- Department of Pharmaceutics, The Third XiangYa Hospital of Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
- Institute of Material Medica, Chinese Academy of Medical Sciences, Beijing, China
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16
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Saenger AK, Christenson RH. Stroke biomarkers: progress and challenges for diagnosis, prognosis, differentiation, and treatment. Clin Chem 2009; 56:21-33. [PMID: 19926776 DOI: 10.1373/clinchem.2009.133801] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Stroke is a devastating condition encompassing a wide range of pathophysiological entities that include thrombosis, hemorrhage, and embolism. Current diagnosis of stroke relies on physician clinical examination and is further supplemented with various neuroimaging techniques. A single set or multiple sets of blood biomarkers that could be used in an acute setting to diagnosis stroke, differentiate between stroke types, or even predict an initial/reoccurring stroke would be extremely valuable. CONTENT We discuss the current classification, diagnosis, and treatment of stroke, focusing on use of novel biomarkers (either solitary markers or multiple markers within a panel) that have been studied in a variety of clinical settings. SUMMARY The current diagnosis of stroke remains hampered and delayed due to lack of a suitable mechanism for rapid (ideally point-of-care), accurate, and analytically sensitive biomarker-based testing. There is a clear need for further development and translational research in this area. Potential biomarkers identified need to be transitioned quickly into clinical validation testing for further evaluation in an acute stroke setting; to do so would impact and improve patient outcomes and quality of life.
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Affiliation(s)
- Amy K Saenger
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA.
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Landim MBP, Casella Filho A, Chagas ACP. Asymmetric dimethylarginine (ADMA) and endothelial dysfunction: implications for atherogenesis. Clinics (Sao Paulo) 2009; 64:471-8. [PMID: 19488614 PMCID: PMC2694252 DOI: 10.1590/s1807-59322009000500015] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2009] [Accepted: 02/20/2009] [Indexed: 02/07/2023] Open
Abstract
Atherosclerotic coronary heart disease is the leading cause of morbidity and mortality in industrialized countries, and endothelial dysfunction is considered a precursor phenomenon. The nitric oxide produced by the endothelium under the action of endothelial nitric oxide synthase has important antiatherogenic functions. Its reduced bioavailabilty is the beginning of the atherosclerotic process. The addition of two methyl radicals to arginine, through the action of methyltransferase nuclear proteins, produces asymmetric dimethylarginine, which competes with L-arginine and promotes a reduction in nitric oxide formation in the vascular wall. The asymmetric dimethylarginine, which is itself considered a mediator of the vascular effects of the several risk factors for atherosclerosis, can be eliminated by renal excretion or by the enzymatic action of the dimethylarginine dimethylaminohydrolases. Several basic science and clinical research studies suggest that the increase in asymmetric dimethylarginine occurs in the context of chronic renal insufficiency, dyslipidemia, high blood pressure, diabetes mellitus, and hyperhomocysteinemy, as well as with other conditions. Therapeutic measures to combat atherosclerosis may reverse these asymmetric dimethylarginine effects or at least reduce the concentration of this chemical in the blood. Such an effect can be achieved with competitor molecules or by increasing the expression or activity of its degradation enzyme. Studies are in development to establish the true role of asymmetric dimethylarginine as a marker and mediator of atherosclerosis, with possible therapeutic applications. The main aspects of the formation and degradation of asymmetric dimethylarginine and its implication in the atherogenic process will be addressed in this article.
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Affiliation(s)
- Maurício Batista Paes Landim
- Heart Institute, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.
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The aggravatory effect of nicotine on Helicobacter pylori-induced gastric mucosa injury: role of asymmetric dimethylarginine. J Clin Gastroenterol 2009; 43:261-6. [PMID: 18936714 DOI: 10.1097/mcg.0b013e3181624485] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND GOAL Nitric oxide (NO) is a well-known gastric mucosa protection factor. Recently, it has been reported that methylated arginine compound such as asymmetric dimethylarginine (ADMA), which inhibits nitric oxide synthesis, may be related to the development of gastric mucosa injury in patients with Helicobacter pylori infection. In the present study, we tested the relationship between endogenous ADMA and gastric mucosa injury in H. pylor- infected patients and cultured gastric epithelial cells. METHODS One hundred and fifty subjects with gastric diseases were entered in this study. The levels of ADMA in gastric juice and plasma were measured in both H. pylori+ and H. pylori- patients. We analyzed independent risk factors that contribute to ADMA levels by multiple linear regression analyses. Mucosal epithelium cells were treated with nicotine (10 microM) for 24 hours in the presence or absence of H. pylori. The concentrations of ADMA in the culture medium and the rate of cell apoptosis were determined. RESULTS The ADMA level in gastric juice was significantly increased in H. pylori+ patients (P<0.05), whereas there were no differences in the content of ADMA in the plasma between H. pylori+ patients and H. pylori- patients. Smoking and H. pylori infection were 2 independent risk factors contributing to ADMA levels, and in the population of H. pylori+ patients, the level of ADMA in smokers was higher compared with nonsmokers. Incubation of nicotine (10 microM) with epithelial cells for 24 hours further increased the elevated level of ADMA and the rate of cell apoptosis owing to H. pylori infection. CONCLUSIONS H. pylori infection caused an increase of ADMA levels in gastric juice, which was aggravated by smoking. Endogenous ADMA may be an important factor contributing to gastric mucosa injury.
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Vladimirova-Kitova L, Deneva T, Angelova E, Nikolov F, Marinov B, Mateva N. Relationship of asymmetric dimethylarginine with flow-mediated dilatation in subjects with newly detected severe hypercholesterolemia. Clin Physiol Funct Imaging 2008; 28:417-25. [PMID: 18798847 DOI: 10.1111/j.1475-097x.2008.00825.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Little is know about the relationship between asymmetric dimethylarginine (ADMA) and percent flow-mediated dilatation (%FMD) in subjects with severe hypercholesterolemia (HH). AIM The aim of the present study was the evaluation of the relationship of ADMA to %FMD, as well as to lipid parameters and other markers of endothelial dysfunction in newly detected subjects with severe HH. METHODS One hundred and twenty asymptomatic patients with severe, newly detected HH and 100 controls were evaluated. The plasma level of ADMA was tested by ELISA and total homocysteine (tHcy) - through fluid chromatographic analysis. The %FMD was evaluated by the diameter of brachial artery with 7.5 MHz transducer of HP SONOS 5500. RESULTS Significant difference was found between patients and controls, (P<0.05) regarding lipid total cholesterol, triglycerides, high-density lipoprotein, low-dencity lipoprotein, atherogenic indices) and non-lipid markers (ADMA, sICAM-1, sVCAM-1), as well as the endothelium dependent %FMD in contrast to flow independent vasodilation. (P>0.05) No significant difference was found between the groups with respect to tHcy, P-selectine and E-selectine. (P>0.05) A strong negative correlation was found between %FMD and ADMA. (r(xy) = -0.895; P<0.001), Apolipoprotein-B (r(xy )= -0.687; P<0.0001, tHcy (r(xy) = -0.560; P<0.001) and Apolipoprotein index -B/A1 (r(xy) = -0.518; P<0.001). The subsequent linear and multiple regression analysis selected ADMA as the most significant factor in relation to %FMD. CONCLUSION It is concluded that ADMA is the basic modulator of %FMD among all tested atherogenic risk biomarkers in in newly detected subjects with severe HH.
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Feng M, Liu L, Guo Z, Xiong Y. Gene transfer of dimethylarginine dimethylaminohydrolase-2 improves the impairments of DDAH/ADMA/NOS/NO pathway in endothelial cells induced by lysophosphatidylcholine. Eur J Pharmacol 2008; 584:49-56. [PMID: 18342305 DOI: 10.1016/j.ejphar.2008.01.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2007] [Revised: 01/02/2008] [Accepted: 01/22/2008] [Indexed: 11/16/2022]
Abstract
Dimethylarginine dimethylaminohydrolase (DDAH) is a key enzyme responsible for the metabolism of nitric oxide (NO) synthase (NOS) inhibitor asymmetric dimethylarginine (ADMA), and DDAH2 is the predominant isoform in vascular endothelium. Lysophosphatidylcholine (LPC) and ADMA are implicated in endothelial dysfunction of atherosclerosis. This study was to examine changes in DDAH/ADMA/NOS/NO pathway in endothelial cells after exposure to LPC and investigate whether DDAH2 gene transfer could reverse LPC-induced changes. Human endothelial cell line ECV304 cells were transfected with recombinant pcDNA3.1-hDDAH2 plasmid and incubated with 3 micromol/L LPC for 48 h. Cells were harvested for assays of DDAH transcription, DDAH and NOS activities. The culture medium was collected for measurements of ADMA and nitrite/nitrate concentrations. LPC treatment suppressed DDAH2 transcription and DDAH activity in parallel with increased ADMA concentration, inhibited NOS activity and decreased NO metabolites content. DDAH2 gene transfer not only prevented the suppression of DDAH activity and the elevation of endogenous ADMA, but also attenuated the inhibition of NOS activity and the reduction of NO level induced by LPC in endothelial cells. These results suggest that LPC induces impairments of DDAH/ADMA/NOS/NO pathway, and DDAH2 gene transfer could improve the LPC-elicited impairments in endothelial cells.
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Affiliation(s)
- Mei Feng
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, Hunan, People's Republic of China
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Zhou Z, Jiang DJ, Jia SJ, Xiao HB, Xiao B, Li YJ. Down-regulation of endogenous nitric oxide synthase inhibitors on endothelial SK3 expression. Vascul Pharmacol 2007; 47:265-71. [PMID: 17869187 DOI: 10.1016/j.vph.2007.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2007] [Revised: 05/23/2007] [Accepted: 08/02/2007] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To investigate role of endogenous nitric oxide synthase inhibitor asymmetric dimethylarginine (ADMA) in down-regulation of the expression of endothelial SK3 in atherosclerosis. METHODS Apolipoprotein E deficient (apo E(-/-)) mice aged 11 approximately 12 weeks were treated with ADMA (5 mg/kg per day, subcutaneous injection) for 4 weeks. Cultured human umbilical venous endothelial cells (HUVECs) were treated with different concentrations of lysophosphatidylcholine (LPC) or ADMA for 48 h. Plasma levels of ADMA were determined by high performance liquid chromatogram (HPLC); protein and mRNA levels of SK3 in the aortas of mice and cultured cells were detected by immunofluorescence, western blot and RT-PCR, respectively. RESULTS Concomitantly with the elevated plasma levels of ADMA, the expressions of both SK3 protein and mRNA in aortas of apo E(-/-) mice were significantly reduced in comparison to those of the wild-type mice. Moreover, 4-week treatment of ADMA made levels of SK3 expression even lower. In cultured HUVECs, either LPC or ADMA notably decreased the expressions of both SK3 protein and mRNA in a concentration dependent manner. CONCLUSIONS Endogenous ADMA may be an important factor for down-regulation of the expression of endothelial SK3 in atherosclerotic animals.
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Affiliation(s)
- Zhi Zhou
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
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Imamura M, Waseda Y, Marinova GV, Ishibashi T, Obayashi S, Sasaki A, Nagai A, Azuma H. Alterations of NOS, arginase, and DDAH protein expression in rabbit cavernous tissue after administration of cigarette smoke extract. Am J Physiol Regul Integr Comp Physiol 2007; 293:R2081-9. [PMID: 17881617 DOI: 10.1152/ajpregu.00406.2007] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Cigarette smoking is an independent risk factor for vasculogenic erectile dysfunction (ED). Nitric oxide (NO) has been demonstrated to be the principal mediator of cavernous smooth muscle relaxation and penile erection. Therefore, we examined whether or not enzyme activities and factors involved in the NO generation pathway are affected in rabbit corpus cavernosum after administration of nicotine- and tar-free cigarette smoke extract (CSE). CSE was prepared by bubbling a stream of cigarette smoke into phosphate-buffered saline. CSE was injected subcutaneously into adult male rabbits once a day for 5 wk. In the CSE group, significantly decreased cyclic GMP production as a marker of NO generation was associated with attenuated overall nitric oxide synthase (NOS) activity, enhanced arginase activity, accumulation of endogenous NOS inhibitors such as monomethylarginine (MMA) and asymmetric dimethylarginine (ADMA), and decreased dimethylarginine dimethylaminohydrolase (DDAH) activity as an metabolizing enzyme of endogenous NOS inhibitors. Neuronal NOS (nNOS) and DDAH I protein expression were decreased without altering endothelial NOS expression, while arginase I expression was upregulated. These results suggest that impaired NO production would result from blunted NOS activity, which is possibly brought about by the downregulation of nNOS protein, accumulation of endogenous NOS inhibitors, and enhanced arginase activity together with upregulation of arginase I protein in cavernous tissue. The impaired DDAH activity due to decreased expression of DDAH I protein would result in an accumulation of endogenous NOS inhibitors with CSE. These alterations may be relevant to induction of the erectile dysfunction following CSE.
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Affiliation(s)
- Masatoshi Imamura
- Dept. of Biosystem Regulation, Tokyo Medical and Dental University, 2-3-10 Surugadai, Kanda, Chiyoda-ku, Tokyo 101-0062, Japan.
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Tan B, Jiang DJ, Huang H, Jia SJ, Jiang JL, Hu CP, Li YJ. Taurine protects against low-density lipoprotein-induced endothelial dysfunction by the DDAH/ADMA pathway. Vascul Pharmacol 2007; 46:338-45. [PMID: 17293168 DOI: 10.1016/j.vph.2006.11.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 11/01/2006] [Indexed: 11/20/2022]
Abstract
Asymmetric dimethylarginine (ADMA), a major endogenous nitric oxide (NO) synthase inhibitor, is thought to be a key contributor for endothelial dysfunction. Decrease in activity of dimethylarginine dimethylaminohydrolase (DDAH), a major hydrolase of ADMA, causes accumulation of ADMA in some risk factors of atherosclerosis, including hypercholesterolemia. Taurine is a semi-essential amino acid that has previously been shown to have endothelial protective effects. The present study was to test whether the protective effect of taurine on endothelial function is related to modulation of the DDAH/ADMA pathway. A single injection of native LDL (4 mg/kg, i.v.) markedly reduced endothelium-dependent vasorelaxation and the plasma level of NO, and increased plasma concentrations of ADMA, malondialdehyde (MDA) and tumor necrosis factor-alpha (TNF-alpha). Treatment with taurine in vivo (60 or 180 mg/kg) significantly attenuated the inhibition of endothelium-dependent vasorelaxation and the reduced level of NO, and decreased the elevated levels of ADMA, MDA, and TNF-alpha. Incubation human umbilical vein endothelial cells (HUVECs) with ox-LDL (100 microg/ml) for 24 h markedly increased the medium levels of lactate dehydrogenase (LDH), ADMA, TNF-alpha and MDA, and decreased the level of NO in the medium and the intracellular activity of DDAH. Taurine (1 or 5 microg/ml) significantly attenuated the increases in the levels of LDH, ADMA, TNF-alpha and MDA, and the decrease in the level of NO and the activity of DDAH induced by ox-LDL in HUVECs. The present results suggested that taurine protected against endothelial dysfunction induced by native LDL in vivo or by ox-LDL in endothelial cells, and the protective effect of taurine on the endothelium is related to decrease in ADMA level by increasing of DDAH activity.
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Affiliation(s)
- Bin Tan
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #110, Changsha 410078, China
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Xiao HB, Yang ZC, Jia SJ, Li NS, Jiang DJ, Zhang XH, Guo R, Zhou Z, Deng HW, Li YJ. Effect of asymmetric dimethylarginine on atherogenesis and erythrocyte deformability in apolipoprotein E deficient mice. Life Sci 2007; 81:1-7. [PMID: 17532008 DOI: 10.1016/j.lfs.2007.04.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2006] [Revised: 03/29/2007] [Accepted: 04/09/2007] [Indexed: 10/23/2022]
Abstract
Previous investigations have shown that the level of asymmetric dimethylarginine (ADMA) was increased in hypercholesterolemic animal and humans, and the decreased erythrocyte deformability has been suggested to be a factor contributing to atherogenesis. In the present study, we investigated the effect of ADMA, endogenous or exogenous, on atherogenesis and erythrocyte deformability in apolipoprotein E deficient (ApoE-/-) mice. On a regular chow diet, ApoE-/- mice or C57BL/6 J mice at 12 weeks of age were treated with ADMA (5 mg/kg/day) for 4 weeks. Atherosclerotic lesion area, erythrocyte deformability, plasma lipids and asymmetric dimethylarginine (ADMA) level were determined. Plasma concentrations of triglyceride (TG), low-density lipoprotein-cholesterol (LDL-C), total cholesterol (TC), ADMA, and atherosclerotic lesion area were significantly increased, and the level of plasma high-density lipoprotein-cholesterol (HDL-C), erythrocyte deformability in ApoE-/- mice were markedly decreased compared with that of C57BL/6J mice (P<0.05 or P<0.01). Exogenous ADMA treatment increased the plasma TG level, produced atherosclerotic lesions, and decreased erythrocyte deformability in C57BL/6J mice (P<0.05 or P<0.01). Treatment with exogenous ADMA further increased the plasma TG level and lesion areas, and decreased erythrocyte deformability in ApoE-/- mice. In vitro, exogenous ADMA caused a decrease of erythrocyte deformability in a concentration-dependent manner, and the effect of ADMA was reversed by L-arginine. The present results suggest that endogenous ADMA is an important contributor to the development of atherosclerosis and that reduction of erythrocyte deformability and impaired endothelial function induced by ADMA may be an important factor facilitating atherosclerotic lesions.
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Affiliation(s)
- Hong-Bo Xiao
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South, University, Changsha, Hunan 410078, China
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Yin QF, Fu SH, He P, Xiong Y. Dimethylarginine dimethylaminohydrolase inhibition and asymmetric dimethylarginine accumulation contribute to endothelial dysfunction in rats exposed to glycosylated protein: Effects of aminoguanidine. Atherosclerosis 2007; 190:53-61. [PMID: 16533509 DOI: 10.1016/j.atherosclerosis.2006.02.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2005] [Revised: 11/30/2005] [Accepted: 02/01/2006] [Indexed: 12/25/2022]
Abstract
OBJECTIVES To determine whether alterations of endogenous asymmetric dimethylarginine (ADMA) concentration and dimethylarginine dimethylaminohydrolase (DDAH) activity are involved in endothelial dysfunction induced by glycosylated bovine serum albumin (GBSA) in rats and effects of aminoguanidine on them. METHODS Endothelium-dependent relaxation of aortic rings from Sprague-Dawley rats after treatment with GBSA in vitro and in vivo was tested. Serum concentrations of ADMA, nitrite/nitrate, and activities of aortic DDAH, nitric oxide synthase (NOS) and superoxide dismutase were measured in GBSA-treated rats. Moreover, serum contents of glycosylated serum protein, and malondialdehyde were also assayed. RESULTS Endothelium-dependent relaxation was significantly impaired either by incubation of aortic rings with GBSA (1.70mmol/l) in vitro for 60min or by injection of GBSA (35mg/kg/d, i.v.) to normal rats for 4 weeks, and serum ADMA levels were remarkably elevated in GBSA-treated rats, which was accompanied by decreases of nitrite/nitrate concentrations, NOS and DDAH activities. Furthermore, elevated glycosylated serum protein, malondialdehyde levels, and reduced superoxide dismutase activity were also observed in GBSA-treated rats. Treatment with aminoguanidine not only improved impairment of endothelium-dependent relaxation but also prevented elevation of endogenous ADMA, which were concomitant with increases of nitrite/nitrate concentration, NOS and DDAH activity. Serum levels of glycosylated serum protein, malondialdehyde, and vascular superoxide dismutase activity were also normalized after aminoguanidine treatment. CONCLUSIONS Decreased DDAH activity and elevated endogenous ADMA is implicated in endothelial dysfunction of rats exposed to GBSA. Aminoguanidine can protect endothelium of rat aorta against injury induced by GBSA both in vitro and in vivo.
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Affiliation(s)
- Qing-Feng Yin
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, Hunan, PR China
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Jiang JL, Zhang XH, Li NS, Rang WQ, Hu CP, Li YJ, Deng HW. Probucol Decreases Asymmetrical Dimethylarginine Level by Alternation of Protein Arginine Methyltransferase I and Dimethylarginine Dimethylaminohydrolase Activity. Cardiovasc Drugs Ther 2006; 20:281-94. [PMID: 16897158 DOI: 10.1007/s10557-006-9065-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
HYPOTHESIS Asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor (NOS), may play an important role in endothelium dysfunction. Probucol, a potent antioxidant drug, may improve endothelium function via reduction of NOS inhibitor level. The present study examined whether the decreased level of ADMA by probucol is related to enhancement of protein arginine methyltransferase I (PRMT I) expression and reduction of dimethylarginine dimethylaminohydrolase (DDAH) activity. METHODS Endothelial cells were cultured and used for all these studies. ADMA concentration and DDAH activity were determined by HPLC. Expression of PRMT I and eNOS were characterized by western blot. RESULTS Pretreatment with oxidized-low density lipoprotein (ox-LDL) (10, 30 or 100 microg/ml) or lysophosphatidylcholine (LPC) (1.0, 2.5 or 5.0 microg/ml) for 12, 24 or 48 h markedly increased the activity of lactate dehydrogenase (LDH) in cultured endothelial cell. Incubation ofendothelial cells with ox-LDL (100 microg/ml) or LPC (5.0 microg/ml) for 48 h significantly increased the expression of PRMT I, and levels of MDA and ADMA, and decreased the concentration of nitrite/nitrate, the expression of eNOS and the activity of DDAH. Probucol significantly decreased the level of ADMA, concomitantly with reduction of PRMT I expression and elevation of DDAH activity and up-regulation of eNOS expression. CONCLUSION In summary, the present results suggest that the protective effect of probucol on endothelium is related to reduction of ADMA concentration by inhibition of PRMT I expression and enhancement of DDAH activity.
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Affiliation(s)
- Jun-Lin Jiang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #110, Changsha, Hunan, 410078, PR China
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Siroen MPC, Teerlink T, Nijveldt RJ, Prins HA, Richir MC, van Leeuwen PAM. The Clinical Significance of Asymmetric Dimethylarginine. Annu Rev Nutr 2006; 26:203-28. [PMID: 16848705 DOI: 10.1146/annurev.nutr.26.061505.111320] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In 1992, asymmetrical dimethylarginine (ADMA) was first described as an endogenous inhibitor of the arginine-nitric oxide (NO) pathway. From then, its role in regulating NO production has attracted increasing attention. Nowadays, ADMA is regarded as a novel cardiovascular risk factor. The role of the kidney and the liver in the metabolism of ADMA has been extensively studied and both organs have proven to play a key role in the elimination of ADMA. Although the liver removes ADMA exclusively via degradation by the enzyme dimethylarginine dimethylaminohydrolase (DDAH), the kidney uses both metabolic degradation via DDAH and urinary excretion to eliminate ADMA. Modulating activity and/or expression of DDAH is still under research and may be a potential therapeutic approach to influence ADMA plasma levels. Interestingly, next to its association with cardiovascular disease, ADMA also seems to play a role in other clinical conditions, such as critical illness, hepatic failure, and preeclampsia. To elucidate the clinical significance of ADMA in these conditions, the field of research must be enlarged.
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Affiliation(s)
- Michiel P C Siroen
- Department of Surgery, VU University Medical Center, Amsterdam, The Netherlands.
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Abstract
Many epidemiological studies indicate that consumption of dietary polyphenolic compounds is beneficial in the prevention of cardiovascular diseases. Xanthones are a class of polyphenolic compounds that commonly occur in plants and have been shown to have extensive biological and pharmacological activities. Recently, the pharmacological properties of xanthones in the cardiovascular system have attracted great interest. Xanthones and xanthone derivatives have been shown to have beneficial effects on some cardiovascular diseases, including ischemic heart disease, atherosclerosis, hypertension and thrombosis. The protective effects of xanthones in the cardiovascular system may be due to their antioxidant, antiinflammatory, platelet aggregation inhibitory, antithrombotic and/or vasorelaxant activities. In particular, the antagonism of endogenous nitric oxide synthase inhibitors by xanthones may represent the basis for improved endothelial function and for reduction of events associated with atherosclerosis.
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Affiliation(s)
- De-Jian Jiang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #90, Changsha 410078, China
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Jia SJ, Jiang DJ, Hu CP, Zhang XH, Deng HW, Li YJ. Lysophosphatidylcholine-induced elevation of asymmetric dimethylarginine level by the NADPH oxidase pathway in endothelial cells. Vascul Pharmacol 2006; 44:143-8. [PMID: 16309971 DOI: 10.1016/j.vph.2005.09.005] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2005] [Accepted: 09/28/2005] [Indexed: 11/24/2022]
Abstract
Recent studies suggested that endothelium is a main source of reactive oxygen species (ROS) and the major source was via NADPH oxidase pathway. Various stimuli including lysophosphatidylcholine (LPC), a major component of oxidized low-density lipoprotein (ox-LDL), can enhance the activity of NADPH oxidase and lead to a marked ROS generation. Asymmetric dimethylarginine (ADMA) is an endogenous nitric oxide (NO) synthase (NOS) inhibitor, which is synthesized by protein arginine methyltransferase I (PRMT I) and degraded by dimethylarginine dimethylaminohydrolase (DDAH) in endothelial cells. Much evidence showed that ADMA was closely related to endothelial dysfunction. Our previous study showed that LPC elevated ADMA level in endothelial cells via increasing oxidative stress, but the precise cellular mechanism is not defined yet. The present study was to explore the mechanism of NADPH oxidase in LPC-induced elevation of ADMA. In LPC-treated endothelial cells, the ROS production, cell viability, ADMA and NO levels, the activity of DDAH and expression of PRMT I were detected. Treatment with LPC (10 microg/ml) for 24 h markedly increased intracellular ROS production, the expression of PRMT I, level of ADMA, decreased the concentration of NO and the activity of DDAH. These effects were attenuated by diphenyliodonium, the NADPH oxidase inhibitor. In summary, the present results suggested that LPC-induced elevation of ADMA was due to reduction of DDAH activity and the up-regulation of PRMT expression by stimulation of ROS production via NADPH oxidase pathway.
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Affiliation(s)
- Su-Jie Jia
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #110, Changsha 410078, China
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Bode-Böger SM, Scalera F, Kielstein JT, Martens-Lobenhoffer J, Breithardt G, Fobker M, Reinecke H. Symmetrical dimethylarginine: a new combined parameter for renal function and extent of coronary artery disease. J Am Soc Nephrol 2006; 17:1128-34. [PMID: 16481412 DOI: 10.1681/asn.2005101119] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Symmetrical dimethylarginine (SDMA) is the structural isomer of the endogenous nitric oxide synthase (NOS) inhibitor asymmetric dimethylarginine. Whereas the major route of asymmetric dimethylarginine elimination is the hydrolytic degradation by dimethylarginine dimethylaminohydrolase, SDMA is eliminated by renal excretion. SDMA does not directly inhibit NOS but is a competitor of arginine transport. This study showed for the first time that measurement of SDMA can be a marker of estimated GFR and extent of coronary artery disease (CAD). In 97 patients with CAD, SDMA was a marker of estimated GFR. On multiple regression analysis of the CAD parameter stenosis score, SDMA was the only parameter retained. In addition, endothelial cells from the third passage were cultured in medium that contained 70 micromol/L arginine and was incubated for 24 h in the presence of various concentration of SDMA (0, 2, 5, 10, and 100 micromol/L). The levels of nitrate and nitrite in conditioned media, the protein expression of NOS, and the content of reactive oxygen species in endothelial cells were determined. SDMA inhibited dose dependently the NO synthesis in intact endothelial cells, whereas it had no effect on protein expression of NOS. This effect was associated with an increase in reactive oxygen species. Co-incubation with L-arginine but not D-arginine reversed the effect of SDMA on NOS pathway. Our data suggest that SDMA reduced the endothelial NO synthesis, probably by limiting L-arginine supply to NOS. It is concluded that SDMA might be a useful parameter for detecting patients in very early stages of chronic kidney disease and for determining their risk for developing cardiovascular disease.
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Affiliation(s)
- Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, University Hospital, Otto von Guericke University, Leipziger Strasse 44, D-39120 Magdeburg, Germany.
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Tang WJ, Hu CP, Chen MF, Deng PY, Li YJ. Epigallocatechin gallate preserves endothelial function by reducing the endogenous nitric oxide synthase inhibitor level. Can J Physiol Pharmacol 2006; 84:163-71. [PMID: 16900942 DOI: 10.1139/y05-156] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Asymmetric dimethylarginine (ADMA), the endogenous nitric oxide synthase inhibitor, is thought to be a key factor contributing to endothelial dysfunction. Tea catechins can cause an endothelium-dependent vasorelaxation. The present study examined the effect of epigallocatechin gallate (EGCG), the major component of tea catechins, on endothelial dysfunction induced by native low density lipoprotein (LDL) in rats and oxidized LDL (ox-LDL) in cultured endothelial cells, and whether the protective effect of EGCG is related to reduction of ADMA level. A single injection of LDL (4 mg·kg–1, i.v.) markedly reduced endothelium-dependent relaxation and the serum nitrite/nitrate (NO) level, and increased serum concentrations of ADMA, malondialdehyde (MDA), and tumor necrosis factor-α (TNF-α). EGCG (10 or 50 mg·kg–1, i.p.) significantly attenuated the inhibition of vasodilator response to acetylcholine and the decreased serum nitrite/nitrate level, and reduced the elevated levels of ADMA, MDA, and TNF-α. Exposure of endothelial cells to ox-LDL (100 μg·mL–1) for 24 h markedly increased the medium levels of lactate dehydrogenase (LDH), ADMA, TNF-α, and MDA, and decreased the level of nitrite/nitrate in the medium and the activity of dimethylarginine dimethylaminohydrolase (DDAH) in the endothelial cells. EGCG (10 and 100 μg·mL–1) significantly decreased the levels of LDH, ADMA, TNF-α, and MDA, and increased the level of nitrite/nitrate and the activity of DDAH. These results suggest that EGCG protects endothelial dysfunction induced by native LDL in vivo or by ox-LDL in endothelial cells, and the protective effect of EGCG on the endothelium is related to decrease in ADMA level via increasing of DDAH activity.
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Affiliation(s)
- Wei-Jun Tang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No.110 Xiang-Ya Road, Changsha 410078, China
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Pedersen LG, Tarnow I, Olsen LH, Teerlink T, Pedersen HD. Body size, but neither age nor asymptomatic mitral regurgitation, influences plasma concentrations of dimethylarginines in dogs. Res Vet Sci 2005; 80:336-42. [PMID: 16182327 DOI: 10.1016/j.rvsc.2005.07.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Revised: 06/27/2005] [Accepted: 07/15/2005] [Indexed: 12/23/2022]
Abstract
Asymmetric dimethylarginine (ADMA) is a marker of various cardiovascular diseases in man. The aim of the present study was to test if Cavalier King Charles Spaniels (CKCS) with varying degrees of mitral regurgitation (MR) had increased plasma concentration of ADMA and furthermore, characterize the plasma level of ADMA and symmetric dimethylarginine (SDMA) in normal dogs. Seventy-six dogs were included (44 CKCS and 32 dogs of other breeds). The CKCS had various degrees of MR, whereas the remaining dogs had either no or minimal MR. Apart from cardiac murmurs, no dogs showed signs of cardiac or systematic disease. The degree of MR had no significant influence on ADMA (P = 0.33). Body weight was directly associated with ADMA (P = 0.0004) and creatinine was directly associated with SDMA (P<0.0001). Furthermore, the plasma concentration of ADMA was three to four times higher than found in healthy humans.
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Affiliation(s)
- L G Pedersen
- Department of Basic Animal and Veterinary Sciences, The Royal Veterinary and Agricultural University, 7 Groennegaardsvej, DK-1870 Frederiksberg C, Copenhagen, Denmark.
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Mollace V, Muscoli C, Masini E, Cuzzocrea S, Salvemini D. Modulation of prostaglandin biosynthesis by nitric oxide and nitric oxide donors. Pharmacol Rev 2005; 57:217-52. [PMID: 15914468 DOI: 10.1124/pr.57.2.1] [Citation(s) in RCA: 249] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The biosynthesis and release of nitric oxide (NO) and prostaglandins (PGs) share a number of similarities. Two major forms of nitric-oxide synthase (NOS) and cyclooxygenase (COX) enzymes have been identified to date. Under normal circumstances, the constitutive isoforms of these enzymes (constitutive NOS and COX-1) are found in virtually all organs. Their presence accounts for the regulation of several important physiological effects (e.g. antiplatelet activity, vasodilation, and cytoprotection). On the other hand, in inflammatory setting, the inducible isoforms of these enzymes (inducible NOS and COX-2) are detected in a variety of cells, resulting in the production of large amounts of proinflammatory and cytotoxic NO and PGs. The release of NO and PGs by the inducible isoforms of NOS and COX has been associated with the pathological roles of these mediators in disease states as evidenced by the use of selective inhibitors. An important link between the NOS and COX pathways was made in 1993 by Salvemini and coworkers when they demonstrated that the enhanced release of PGs, which follows inflammatory mechanisms, was nearly entirely driven by NO. Such studies raised the possibility that COX enzymes represent important endogenous "receptor" targets for modulating the multifaceted roles of NO. Since then, numerous papers have been published extending the observation across various cellular systems and animal models of disease. Furthermore, other studies have highlighted the importance of such interaction in physiology as well as in the mechanism of action of drugs such as organic nitrates. More importantly, mechanistic studies of how NO switches on/off the PG/COX pathway have been undertaken and additional pathways through which NO modulates prostaglandin production unraveled. On the other hand, NO donors conjugated with COX inhibitors have recently found new interest in the understanding of NO/COX reciprocal interaction and potential clinical use. The purpose of this article is to cover the advances which have occurred over the years, and in particular, to summarize experimental data that outline how the discovery that NO modulates prostaglandin production has impacted and extended our understanding of these two systems in physiopathological events.
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Affiliation(s)
- Vincenzo Mollace
- Faculty of Pharmacy, University of Catanzaro Magna Graecia, Roccelletta di Borgia, Catanazaro, Italy
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Yin QF, Xiong Y. Pravastatin Restores DDAH Activity and Endothelium-Dependent Relaxation of Rat Aorta After Exposure to Glycated Protein. J Cardiovasc Pharmacol 2005; 45:525-32. [PMID: 15897778 DOI: 10.1097/01.fjc.0000159642.44523.7f] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study was designed to investigate whether glycated bovine serum albumin (AGE-BSA) inhibits dimethylarginine dimethylaminohydrolase (DDAH) activity to contribute to its adverse effect on endothelium-dependent relaxation in rat aorta, and whether pravastatin reverses the inhibition of DDAH activity and endothelial dysfunction induced by AGE-BSA. Endothelium-dependent relaxation of aortic rings was measured by isometric tension recording, and DDAH activity, and the contents of nitrite/nitrate as well as malondialdehyde (MDA) in aortic tissue were determined after exposure of Sprague-Dawley rat aorta to AGE-BSA (1.70 mmol/L) for 60 minutes in the presence or absence of pravastatin. In comparison with control, both endothelium-dependent relaxation and DDAH activity (0.032 +/- 0.002 versus 0.095 +/- 0.003 U/g protein, n = 5, P < 0.01) were significantly inhibited in isolated rat aorta after exposure to AGE-BSA, which was accompanied by decreases of nitrite/nitrate contents and elevations of MDA levels in aorta. Treatment with pravastatin (1 mmol/L) not only prevented the inhibition of endothelial function but also reversed the decrease of DDAH activity induced by AGE-BSA and normalized the alterations in nitrite/nitrate and MDA contents. Similar effects were observed when rat aorta exposed to AGE-BSA in the presence of antioxidant pyrrolidine dithiocharbamate (PDTC, 30 micromol/L) or protein kinase C inhibitor chelerythrine (1 micromol/L). These results suggested that decreased DDAH activity may be involved in endothelial dysfunction of rat aorta induced by AGE-BSA, and that pravastatin restores DDAH activity and endothelium-dependent relaxation after aorta exposure to AGE-BSA, which may be secondary to its antioxidative effects.
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Affiliation(s)
- Qing-Feng Yin
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Hunan, P. R. China
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Kang KK, Yu JY, Yoo M, Kwon JW. The effect of DA-8159, a novel PDE5 inhibitor, on erectile function in the rat model of hypercholesterolemic erectile dysfunction. Int J Impot Res 2005; 17:409-16. [PMID: 15920460 DOI: 10.1038/sj.ijir.3901331] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study examined the effects of a new phosphodiesterase type 5 inhibitor, DA-8159, on erectile function associated with hypercholesterolemia. First of all, in order to investigate whether chronic administration of DA-8159 prevents the development of erectile dysfunction associated with hypercholesterolemia, male SD rats were divided into four groups (normal control, hypercholesterolemic control, DA-8159 5 or 20 mg/kg/day). Over a 5-month period, the animals were fed a 2% cholesterol diet and administered DA-8159 orally once a day. After 5 months, the electrostimulation-induced penile erection and the vascular function using acetylcholine-induced vasodilation with endothelium-intact aortic rings were examined. Furthermore, the plasma lipid profiles, endothelin and N(G),N(G)-dimethylarginine (asymmetrical dimethylarginine, ADMA) concentrations were measured. In order to investigate the acute treatment effect of DA-8159 on the erectile function in an established hypercholesterolemic model, additional animals were given a 2% cholesterol diet for 5 months without DA-8159. At the end of 5 months, the rats were divided into three groups (hypercholesterolemic control, DA-8159 0.3 or 1 mg/kg). DA-8159 was administered intravenously 1 min prior to the intracavernous pressure (ICP) measurement. In a chronic treatment study, while the hypercholesterolemic control showed a significantly lower erectile function, vascular reactivity, and increased plasma cholesterol, endothelin and ADMA concentration, the chronic DA-8159 treatment clearly restored the erectile responses by electric stimulation, preserved the potential of thoracic aortic relaxation in a dose-dependent manner, and significantly decreased the plasma endothelin and ADMA concentrations. In an acute treatment study, DA-8159 induced a dose- and frequency-dependent increase in ICP. The ICP/BP ratio and the corresponding AUC values, and the detumescence time were also significantly increased compared to the hypercholesterolemic control. These results suggest that DA-8159 is beneficial for erectile dysfunction in a rat hypercholesterolemic model and provided a rationale for the potential use of DA-8159 for treating erectile dysfunction secondary to hypercholesterolemia.
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Affiliation(s)
- K K Kang
- Research Laboratories of Dong-A Pharmaceutical Company, Preclinical Division, Sangal, Kiheung, Youngin, Kyunggi, Republic of Korea.
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Nijveldt RJ, Teerlink T, Siroen MPC, van der Hoven B, Prins HA, Wiezer MJ, Meijer C, van der Sijp JRM, Cuesta MA, Meijer S, van Leeuwen PAM. Elevation of asymmetric dimethylarginine (ADMA) in patients developing hepatic failure after major hepatectomy. JPEN J Parenter Enteral Nutr 2005; 28:382-7. [PMID: 15568284 DOI: 10.1177/0148607104028006382] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
BACKGROUND Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of the arginine-nitric oxide pathway. It is conceivable that its concentration is tightly regulated by urinary excretion and degradation by the enzyme dimethylarginine dimethylaminohydrolase, which is highly expressed in the liver. In rats, we showed a high net hepatic uptake of ADMA. Therefore, we aimed to confirm the role of the liver in humans and hypothesized elevated ADMA levels after major liver resection by a reduction of functional liver mass and injury to the remnant liver. METHODS Patients undergoing a major hepatic resection (HEP, n = 17) or major abdominal surgery (MAS, n = 12) were included and followed in time. In addition, ADMA levels were measured in 4 patients having severe hepatic failure after a liver resection. Plasma ADMA concentration was measured by high-performance liquid chromatography. RESULTS Preoperatively and on days 1, 3, and 5, plasma levels of ADMA were higher in HEP patients when compared with MAS patients. In HEP patients with prolonged (>7 days) hepatic injury, ADMA levels were especially elevated. On the first postoperative day, ADMA significantly correlated to bilirubin concentration (r = .528, p < .05) as a marker of postoperative hepatic function. Besides, in patients with severe hepatic failure, ADMA levels were highly elevated. CONCLUSIONS In the present study, evidence was found for the role of the liver in the elimination of ADMA in humans. Increased levels of ADMA occur in the postoperative course after a major hepatic resection, especially when liver function is severely impaired. Further studies need to assess the role of ADMA in the development of complications after liver surgery.
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Affiliation(s)
- Robert J Nijveldt
- Department of Surgery, VU University Medical Center, Amsterdam, The Netherlands.
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Fu YF, Xiong Y, Guo Z. A reduction of endogenous asymmetric dimethylarginine contributes to the effect of captopril on endothelial dysfunction induced by homocysteine in rats. Eur J Pharmacol 2005; 508:167-75. [PMID: 15680268 DOI: 10.1016/j.ejphar.2004.11.063] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2004] [Revised: 11/19/2004] [Accepted: 11/30/2004] [Indexed: 12/22/2022]
Abstract
We examined whether captopril exerts beneficial effect on homocysteine-induced endothelial dysfunction in vivo and whether this effect of captopril is associated with a reduction of endogenous inhibitor of nitric oxide synthase (NOS) asymmetric dimethylarginine (ADMA) in rats. Male Sprague-Dawley rats were given intravenous injections of homocysteine (10 mg/kg/day) to induce endothelial dysfunction. Captopril treatment (3 mg/kg/day, i.v.) was taken in some rats after homocysteine administration. Endothelium-dependent relaxation was tested in aortic rings. Serum levels of ADMA, nitrite/nitrate, malondialdehyde (MDA), and creatinine were measured. Furthermore, superoxide dismutase activity in liver and angiotensin converting enzyme activity in serum were also assayed. Administration of homocysteine to rats for 4 weeks significantly impaired endothelium-dependent relaxation compared with control rats. This impairment of endothelium-dependent relaxation was accompanied by elevated serum concentration of ADMA and decreased serum content of nitrite/nitrate. Moreover, serum concentration of MDA was remarkably increased, whereas liver superoxide dismutase activity was decreased in homocysteine-treated group compared with control. Chronic captopril treatment not only improved the impaired endothelium-dependent relaxation, but also prevented the elevation of serum ADMA and MDA levels, as well as reduction of serum nitrite/nitrate contents and liver superoxide dismutase activity. Serum angiotensin converting enzyme activity and creatinine had no significant difference between the three groups. These results suggest that chronic captopril treatment reduces endogenous inhibitor of NOS in rats with homocysteine injection, which may contribute to the beneficial effect of captopril on homocysteine-induced endothelial dysfunction in vivo, and may be secondary to the antioxidative action of captopril.
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Affiliation(s)
- Yun-Feng Fu
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, 110 Xiang-ya road, Changsha 410078, Hunan, PR China
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Nijveldt RJ, Siroen MPC, Teerlink T, van Lambalgen AA, Rauwerda JA, van Leeuwen PAM. Gut and liver handling of asymmetric and symmetric dimethylarginine in the rat under basal conditions and during endotoxemia. Liver Int 2004; 24:510-8. [PMID: 15482350 DOI: 10.1111/j.1478-3231.2004.0948.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
INTRODUCTION/AIM Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide (NO) synthase enzymes, whereas symmetric dimethylarginine (SDMA) competes with arginine transport. Although both dimethylarginines may be important regulators of the arginine-NO pathway, their metabolism is largely unknown. In previous studies, evidence was found for the liver in the metabolism of dimethylarginines. We aimed to investigate dimethylarginine handling of the gut and the liver in detail under basal conditions and during endotoxemia. METHODS Twenty-one male Wistar rats were used for this study. Endotoxemia was induced by lipopolysaccharide (LPS) infusion (8 mg/kg). Blood flow was measured using radiolabeled microspheres according to the reference sample method. Concentration of dimethylarginines were measured by high-performance liquid chromatography. The combination of arteriovenous concentration difference and organ blood flow allowed calculation of net organ fluxes and fractional extraction (FE) rates. RESULTS Arterial plasma concentration of ADMA was lower in LPS rats, in contrast to a higher SDMA concentration. For the gut, net release of ADMA was found, which was higher in LPS rats. In contrast, for the gut, net uptake of SDMA was found, which was lower in LPS rats. For the liver, a high net uptake of ADMA was found in both groups, while FE was significantly increased in LPS rats. Hepatic handling of SDMA was negligible. CONCLUSION The liver plays an important role in eliminating ADMA from the circulation and endotoxemia stimulates this capacity. In contrast to the liver, the gut releases ADMA. Endotoxemia results in a reduced systemic ADMA concentration.
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Affiliation(s)
- Robert J Nijveldt
- Department of Surgery, VU University Medical Center, 1007 MB Amsterdam, the Netherlands
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Valkonen VP, Laaksonen R. Asymmetric dimethylarginine (ADMA) and acute vascular events. Clin Chim Acta 2004; 348:9-17. [PMID: 15369730 DOI: 10.1016/j.cccn.2004.05.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2004] [Revised: 05/12/2004] [Accepted: 05/14/2004] [Indexed: 11/25/2022]
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Jiang DJ, Jiang JL, Zhu HQ, Tan GS, Liu SQ, Xu KP, Li YJ. Demethylbellidifolin preserves endothelial function by reduction of the endogenous nitric oxide synthase inhibitor level. JOURNAL OF ETHNOPHARMACOLOGY 2004; 93:295-306. [PMID: 15234768 DOI: 10.1016/j.jep.2004.03.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2004] [Revised: 02/15/2004] [Accepted: 03/26/2004] [Indexed: 05/24/2023]
Abstract
The present study examined the anti-oxidation and protective effects of demethylbellidifolin (DMB), a xanthone compound extracted from swertia davidi Franch, on endothelium. The relationship between the protective effects of DMB on endothelium and the level of asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase, was also determined in the present study. DMB significantly inhibited Cu(2+)-induced low-density lipoprotein (LDL) oxidation and scavenged DPPH radicals. DMB significantly attenuated the inhibition of endothelium-dependent vasodilator responses, induced by lysophosphatidycholine (LPC) in vitro and LDL in vivo, and increased release of lactate dehydrogenase induced by LDL in cultured endothelial cells. DMB significantly attenuated the increased concentration of malondialdehyde and ADMA, and the decreased level of nitric oxide induced by LDL in vivo and in cultured endothelial cells. DMB also significantly reduced the decreased activity of dimethylarginine dimethylaminohydrolase (DDAH) induced by LDL in cultured endothelial cells. In summary, the present results suggest that DMB protects endothelial damage induced by LPC in vitro and LDL in vivo or in endothelial cells, and the protective effect of DMB on the endothelium is related to reduction of ADMA concentration via an increase of DDAH activity by inhibition of lipid peroxidation.
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Affiliation(s)
- De-Jian Jiang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
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Dai Z, Zhu HQ, Jiang DJ, Jiang JL, Deng HW, Li YJ. 17β-Estradiol preserves endothelial function by reduction of the endogenous nitric oxide synthase inhibitor level. Int J Cardiol 2004; 96:223-7. [PMID: 15262037 DOI: 10.1016/j.ijcard.2003.07.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2003] [Revised: 07/22/2003] [Accepted: 07/25/2003] [Indexed: 11/27/2022]
Abstract
Previous studies have shown that endothelial dysfunction is associated to an increase of endogenous nitric oxide synthase (NOS) inhibitor level and estrogen reduces impairment of the endothelium due to oxidized low-density lipoprotein (LDL). The purpose of the present study was to investigate the effect of estradiol on endothelial dysfunction and the increased level of asymmetric dimethylarginine (ADMA), an endogenous nitric oxide synthase inhibitor, induced by LDL. Male Sprague-Dawley rats were treated with a single injection of native LDL (4 mg/kg) for 48 h. Vasodilator responses to acetylcholine in the aortic rings and serum levels of ADMA and malondialdehyde (MDA) were determined. Treatment with native LDL markedly reduced endothelium-dependent relaxation to acetylcholine in the isolated rat thoracic aortic rings and increased serum levels of ADMA and MDA (P < 0.01). Pretreatment with 17beta-estradiol (0.1 or 0.3 mg/kg) significantly attenuated inhibition of vasodilator responses to acetylcholine and elevation of both ADMA and MDA concentration by LDL (P < 0.01). These results suggest that estradiol possesses a protective effect on the endothelium and the protective effect is related to reduction of ADMA concentration by inhibition of lipid peroxidation.
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Affiliation(s)
- Zhong Dai
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road #88, Changsha, Hunan 410078, China
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Jiang DJ, Hu GY, Jiang JL, Xiang HL, Deng HW, Li YJ. Relationship between protective effect of xanthone on endothelial cells and endogenous nitric oxide synthase inhibitors. Bioorg Med Chem 2003; 11:5171-7. [PMID: 14604680 DOI: 10.1016/j.bmc.2003.08.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
1,3,5,6-tetrahydroxyxanthone was synthesized. The relationship between protective effect of xanthone on endothelial cells and endogenous nitric oxide synthase inhibitors was investigated. Endothelial cells were treated with ox-LDL (100 microg/mL) for 48 h. Adhesion of monocytes to endothelial cells and release of lactate dehydrogenase (LDH) was determined. Levels of tumor necrosis factor-alpha (TNF-alpha), monocyte chemoattractant protein-1 (MCP-1), nitric oxide (NO) and asymmetric dimethylarginine (ADMA, an endogenous inhibitor of nitric oxide synthase) in conditioned medium and activity of dimethylarginine dimethylaminohydrolase (DDAH) in endothelial cells were measured. Incubation of endothelial cells with ox-LDL (100 microg/mL) for 48 h markedly enhanced the adhesion of monocytes to endothelial cells, increased the release of LDH, the levels of TNF-alpha, MCP-1 and ADMA, and decreased the content of NO and the activity of DDAH. Xanthone (1,3,5,6-tetrahydroxyxanthone) (1, 3 or 10 micromol/L) significantly inhibited the increased adhesion of monocytes to endothelial cells and attenuated the increased levels of LDH, MCP-1 and ADMA induced by ox-LDL. Xanthone (1,3,5,6-tetrahydroxyxanthone) (3 or 10 micromol/L) significantly attenuated the increased level of TNF-alpha and decreased level of NO and activity of DDAH by ox-LDL. The present results suggest that xanthone (1,3,5,6-tetrahydroxyxanthone) preserves endothelial cells and inhibits the increased adhesion of monocytes to endothelial cells induced by ox-LDL, and that the protective effect of xanthone (1,3,5,6-tetrahydroxyxanthone) on endothelial cells is related to reduction of ADMA concentration via increase of DDAH activity.
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Affiliation(s)
- De-Jian Jiang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
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Xiong Y, Fu YF, Fu SH, Zhou HH. Elevated levels of the serum endogenous inhibitor of nitric oxide synthase and metabolic control in rats with streptozotocin-induced diabetes. J Cardiovasc Pharmacol 2003; 42:191-6. [PMID: 12883321 DOI: 10.1097/00005344-200308000-00006] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This study was designed to determine the relationship between elevated levels of the endogenous inhibitor of nitric oxide synthase, asymmetric dimethylarginine (ADMA), and metabolic control in rats with streptozotocin-induced diabetes. Serum levels of ADMA were measured by high-performance liquid chromatography at 8 weeks after diabetes was induced. Endothelium-dependent relaxation to acetylcholine was tested in aortic rings from nondiabetic age-matched control, untreated diabetic, and insulin-treated diabetic rats to evaluate endothelial function. Serum concentrations of glucose, glycosylated serum protein, and malondialdehyde were examined to estimate metabolic control. Serum levels of ADMA increased dramatically in untreated diabetic rats compared with control rats. This elevation in ADMA levels was accompanied by impairment of the endothelium-dependent relaxation response to acetylcholine in aortic rings. Long-term insulin treatment not only prevented the elevation of serum ADMA levels, but also improved the impairment of endothelium-dependent relaxation in diabetic rats. Serum levels of glucose, glycosylated serum protein, and malondialdehyde were significantly increased in parallel with the elevation of ADMA in untreated diabetic rats compared with control rats. These parameters were normalized after diabetic rats received insulin treatment for 8 weeks. These results provide the first evidence that an elevation in the concentration of ADMA in rats with streptozotocin-induced diabetes is closely related to metabolic control of the disease.
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Affiliation(s)
- Yan Xiong
- Department of Pharmacology, Basic and Clinic Pharmacological Institute, Xiang-ya Medical College, Central South University, 88 Xiang-ya Road, Changsha 410 078 Hunan, P.R. China.
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Huang LF, Guo FQ, Liang YZ, Hu QN, Cheng BM. Rapid simultaneous determination of arginine and methylated arginines in human urine by high-performance liquid chromatography–mass spectrometry. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00554-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Hori T, Matsubara T, Ishibashi T, Ozaki K, Tsuchida K, Mezaki T, Tanaka T, Nasuno A, Kubota K, Nakamura Y, Yamazoe M, Aizawa Y, Nishio M. Significance of asymmetric dimethylarginine (ADMA) concentrations during coronary circulation in patients with vasospastic angina. Circ J 2003; 67:305-11. [PMID: 12655160 DOI: 10.1253/circj.67.305] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The basal activity of nitric oxide (NO) is reduced in spastic arteries of patients with vasospastic angina (VSA). Elevated concentrations of ADMA are associated with reduced NO production and impaired endothelium-dependent vasodilatation. The aim of this study was to elucidate the role of ADMA and its relationship to NO end-products (NOx; nitrate + nitrite) during coronary circulation in patients with VSA. The plasma ADMA and NOx concentrations during coronary circulation were evaluated in 16 VSA and 16 control patients. Blood samples were obtained from the coronary sinus (V) and the ostium of the left coronary artery (A), and the (V-A) differences of ADMA and NOx were determined. The coronary sinus plasma ADMA concentration in patients with VSA was higher than that in the control. The coronary sinus - arterial (V-A) difference of NOx was negative in the VSA group and approximately zero in the control group (VSA group =-1.4 micromol/L, control group =-0.1 micromol/L, p=0.0005). Furthermore, in the VSA patients, there was a negative correlation between the (V-A) difference of NOx and the basal coronary artery tone at the site of spasm (r=-0.60, p=0.015). A significant negative correlation between the (V-A) differences of NOx and ADMA was observed in patients with VSA (r=-0.52, p<0.05), but not in those of the control. Higher ADMA concentrations might cause the reduced formation of NO that underlies the pathophysiology of coronary vasospasm.
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Affiliation(s)
- Tomoyuki Hori
- The First Department of Internal Medicine, Niigata University School of Medicine, Japan
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Lu R, Zhu HQ, Peng J, Li NS, Li YJ. Endothelium-dependent vasorelaxation and the expression of calcitonin gene-related peptide in aged rats. Neuropeptides 2002; 36:407-12. [PMID: 12507435 DOI: 10.1016/s0143-4179(02)00110-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
To explore the age-related change in endothelium-dependent vasorelaxation, plasma concentrations and the expression of calcitonin gene-related peptide (CGRP) as well as serum concentrations of asymmetry dimethylarginine (ADMA), male Sprague-Dawley rats, aged 6 and 24 months were tested. The level of ADMA and CGRP in blood, and CGRP mRNA in dorsal root ganglia (DRG) were determined by high-performance liquid chromatography (HPLC), radioimmunoassay or semi-quantitative reverse-transcription polymerase chain reaction, respectively. Vasodilator responses to cumulative concentrations of acetylcholine (ACh) (3 x 10(-9) - 3 x 10(-7)M) and CGRP (3 x 10(-10) - 3 x 10(-8)M) were tested at the plateau of contraction in aortas rings. Vasodilator responses to ACh or CGRP at 24 months of age were decreased compared with 6 months. The serum concentration of ADMA at 24 months of age was significantly increased compared with 6 months, while both plasma concentrations of CGRP and the expressions of alpha- and beta-CGRP mRNA were unchanged at two age groups. The results suggest that endothelium-dependent relaxation, but not concentrations and the expressions of CGRP, is decreased in aged rats, and the decrease in endothelium dependence of vasodilator response to CGRP may be related to the elevation of endogenous ADMA.
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Affiliation(s)
- R Lu
- Department of Pharmacology, Xiang-Ya School of Medicine, Central South University, Changsha 410078, China
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Nellore K, Harris NR. L-arginine and antineutrophil serum enable venular control of capillary perfusion in hypercholesterolemic rats. Microcirculation 2002; 9:477-85. [PMID: 12483545 DOI: 10.1038/sj.mn.7800162] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2002] [Accepted: 08/03/2002] [Indexed: 11/09/2022]
Abstract
OBJECTIVE The purpose of this study was to investigate and counteract dysfunctional control of capillary flow in hypercholesterolemia. Capillary flow is controlled by arteriolar tone, which in turn is influenced by mediators released from closely paired venules in a mechanism that involves nitric oxide (NO). However, venular control of capillary flow is altered with hypercholesterolemia. METHODS Rats were given a normal or high-cholesterol diet before measurements of mesenteric capillary red blood cell velocity. The arteriolar pathway leading to the capillary was videotaped to measure the percent of the surrounding area (within 15 |gmm) that was occupied by a venule (% pairing). RESULTS Venule-paired arterioles were significantly smaller in hypercholesterolemia compared with normocholesterolemia, corresponding to slower capillary flow. A positive correlation between capillary velocity and % pairing observed in normocholesterolemia was not observed during NO synthase inhibition or in hypercholesterolemic rats. However, positive correlations between the two parameters were found in hypercholesterolemia when the rats were given drinking water supplementation of L-arginine or an injection of antineutrophil serum, both of which tended to improve velocity in capillaries branching from venule-paired arteriolar pathways. CONCLUSIONS Dysfunctional venular control of capillary perfusion in hypercholesterolemia may be a consequence of a neutrophil-mediated deficiency of NO.
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Affiliation(s)
- Kavitha Nellore
- Bioengineering Department, Pennsylvania State University, University Park, PA, USA
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Stokes KY, Cooper D, Tailor A, Granger DN. Hypercholesterolemia promotes inflammation and microvascular dysfunction: role of nitric oxide and superoxide. Free Radic Biol Med 2002; 33:1026-36. [PMID: 12374614 DOI: 10.1016/s0891-5849(02)01015-8] [Citation(s) in RCA: 172] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Relatively brief periods (days) of hypercholesterolemia can exert profound effects on endothelium-dependent functions of the microcirculation, including dilation of arterioles, fluid filtration across capillaries, and regulation of leukocyte recruitment in postcapillary venules. Hypercholesterolemia appears to convert the normal anti-inflammatory phenotype of the microcirculation to a proinflammatory phenotype. This phenotypic change appears to result from a decline in nitric oxide (NO) bioavailability that results from a reduction in NO biosynthesis, inactivation of NO by superoxide (O(2)(*)(-)), or both. A consequence of the hypercholesterolemia-induced microvascular responses is an enhanced vulnerability of the microcirculation to the deleterious effects of ischemia and other inflammatory conditions. Hence, therapeutic strategies that are directed towards preventing the early microcirculatory dysfunction and inflammation caused by hypercholesterolemia may prove effective in reducing the high mortality associated with ischemic tissue diseases. Agents that act to maintain the normal balance between NO and reactive oxygen species (ROS) in vascular endothelial cells may prove particularly useful in this regard.
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Affiliation(s)
- Karen Y Stokes
- Department of Molecular and Cellular Physiology, LSU Health Sciences Center, Shreveport, LA 71130-3932, USA
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MASUDA HITOSHI, TSUJII TOSHIHIKO, OKUNO TETSUO, KIHARA KAZUNORI, GOTO MORITAKA, AZUMA HIROSHI. Localization and Role of Nitric Oxide Synthase and Endogenous Nitric Oxide Synthase Inhibitors in the Rabbit Lower Urinary Tract. J Urol 2002. [DOI: 10.1016/s0022-5347(05)65135-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- HITOSHI MASUDA
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - TOSHIHIKO TSUJII
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - TETSUO OKUNO
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - KAZUNORI KIHARA
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - MORITAKA GOTO
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - HIROSHI AZUMA
- From the Departments of Urology and Reproductive Medicine and Molecular Design, Institute of Biomaterials and Bioengineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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Localization and Role of Nitric Oxide Synthase and Endogenous Nitric Oxide Synthase Inhibitors in the Rabbit Lower Urinary Tract. J Urol 2002. [DOI: 10.1097/00005392-200205000-00078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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