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Kraler S, Libby P, Evans PC, Akhmedov A, Schmiady MO, Reinehr M, Camici GG, Lüscher TF. Resilience of the Internal Mammary Artery to Atherogenesis: Shifting From Risk to Resistance to Address Unmet Needs. Arterioscler Thromb Vasc Biol 2021; 41:2237-2251. [PMID: 34107731 PMCID: PMC8299999 DOI: 10.1161/atvbaha.121.316256] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Fueled by the global surge in aging, atherosclerotic cardiovascular disease reached pandemic dimensions putting affected individuals at enhanced risk of myocardial infarction, stroke, and premature death. Atherosclerosis is a systemic disease driven by a wide spectrum of factors, including cholesterol, pressure, and disturbed flow. Although all arterial beds encounter a similar atherogenic milieu, the development of atheromatous lesions occurs discontinuously across the vascular system. Indeed, the internal mammary artery possesses unique biological properties that confer protection to intimal growth and atherosclerotic plaque formation, thus making it a conduit of choice for coronary artery bypass grafting. Its endothelium abundantly expresses nitric oxide synthase and shows accentuated nitric oxide release, while its vascular smooth muscle cells exhibit reduced tissue factor expression, high tPA (tissue-type plasminogen activator) production and blunted migration and proliferation, which may collectively mitigate intimal thickening and ultimately the evolution of atheromatous plaques. We aim here to provide insights into the anatomy, physiology, cellular, and molecular aspects of the internal mammary artery thereby elucidating its remarkable resistance to atherogenesis. We propose a change in perspective from risk to resilience to decipher mechanisms of atheroresistance and eventually identification of novel therapeutic targets presently not addressed by currently available remedies.
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Affiliation(s)
- Simon Kraler
- Center for Molecular Cardiology, University of Zürich, 8952 Schlieren, Switzerland
| | - Peter Libby
- Division of Cardiovascular Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, USA
| | - Paul C. Evans
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Alexander Akhmedov
- Center for Molecular Cardiology, University of Zürich, 8952 Schlieren, Switzerland
| | - Martin O. Schmiady
- Clinic for Cardiac Surgery, University Heart Centre, University Hospital Zurich, Zurich, Switzerland
| | - Michael Reinehr
- Institute of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Giovanni G. Camici
- Center for Molecular Cardiology, University of Zürich, 8952 Schlieren, Switzerland
- University Heart Center, Department of Cardiology, University Hospital, Zurich, Switzerland
- Department of Research and Education, University Hospital Zurich, Zurich, Switzerland
| | - Thomas F. Lüscher
- Center for Molecular Cardiology, University of Zürich, 8952 Schlieren, Switzerland
- Royal Brompton and Harefield Hospitals and Imperial College, London, United Kingdom
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Lucas ML, Carraro CC, Belló-Klein A, Kalil AN, Aerts N. Oxidative stress in carotid arteries of patients submitted to carotid endarterectomy. The role of aging process. Acta Cir Bras 2017; 31:564-8. [PMID: 27579885 DOI: 10.1590/s0102-865020160080000010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 07/22/2016] [Indexed: 11/21/2022] Open
Abstract
PURPOSE To evaluated the role of oxidative stress on aging process in patients submitted to carotid endarterectomy. METHODS Twenty patients were divided into two groups: older group (≥ 70 years old); and the younger group (< 70 years old). We evaluated the reactive oxygen species (ROS) concentration, nicotinamide adenine dinucleotide phosphate (NADPH)-oxidase, superoxide dismutase (SOD) and catalase (CAT) activities as so as nitrite levels in fragments of carotid arteries harvested during carotid endarterectomy for treatment of high grade carotid stenosis. RESULTS We observed a higher levels of ROS and NADPH oxidase activity in the older group (p<0.05). Furthermore, the nitrite concentration was lower in the older group (14.55 ± 5.61 x 10-3 versus 26.42 ± 8.14 x 10-3 µM; p=0.0123). However, the activities of antioxidant enzymes (CAT and SOD) were similar in both the groups. CONCLUSIONS : Arterial aging is associated with increased concentrations of oxygen species and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity as so as nitrite reduction in human carotid artery specimens. Maybe therapies that block NADPH oxidase activity and enhance nitrite stores would be a good strategy to reduce the effect of oxidative stress in arterial aging.
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Affiliation(s)
- Márcio Luís Lucas
- Master in Medicine, Vascular Surgeon, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Brazil. Technical procedures, acquisition and interpretation of data, manuscript writing, critical revision
| | - Cristina Campos Carraro
- PhD, Department of Cardiovascular Physiology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre-RS, Brazil. Technical procedures, interpretation of data, critical revision
| | - Adriane Belló-Klein
- PhD, Associate Professor, Department of Physiology, UFRGS, Porto Alegre-RS, Brazil. Technical procedures, interpretation of data
| | - Antônio Nocchi Kalil
- PhD, Associate Professor, Department of Surgery, UFSCPA, Porto Alegre-RS, Brazil. Technical procedures, acquisition of data
| | - Newton Aerts
- PhD, Chairman and Head, Department of Vascular Surgery, UFSCPA, Porto Alegre-RS, Brazil. Interpretation of data, critical revision
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Winnik S, Gaul DS, Siciliani G, Lohmann C, Pasterk L, Calatayud N, Weber J, Eriksson U, Auwerx J, van Tits LJ, Lüscher TF, Matter CM. Mild endothelial dysfunction in Sirt3 knockout mice fed a high-cholesterol diet: protective role of a novel C/EBP-β-dependent feedback regulation of SOD2. Basic Res Cardiol 2016; 111:33. [PMID: 27071400 PMCID: PMC4829622 DOI: 10.1007/s00395-016-0552-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 03/30/2016] [Indexed: 11/25/2022]
Abstract
Sirtuin 3 (Sirt3) is an NAD+-dependent mitochondrial deacetylase associated with superoxide dismutase 2 (SOD2)-mediated protection from oxidative stress. We have reported accelerated weight gain and impaired metabolic flexibility in atherosclerotic Sirt3−/− mice. Oxidative stress is a hallmark of endothelial dysfunction. Yet, the role of Sirt3 in this context remains unknown. Thus, we aimed to unravel the effects of endogenous Sirt3 on endothelial function and oxidative stress. Knockdown of Sirt3 in human aortic endothelial cells (HAEC) increased intracellular mitochondrial superoxide accumulation, as assessed by electron spin resonance spectroscopy and fluorescence imaging. Endothelium-dependent relaxation of aortic rings from Sirt3−/− mice exposed to a normal diet did not differ from wild-type controls. However, following 12 weeks of high-cholesterol diet and increasing oxidative stress, endothelial function of Sirt3−/− mice was mildly impaired compared with wild-type controls. Relaxation was restored upon enhanced superoxide scavenging using pegylated superoxide dismutase. Knockdown of Sirt3 in cultured HAEC diminished SOD2 specific activity, which was compensated for by a CCAAT/enhancer binding protein beta (C/EBP-β)-dependent transcriptional induction of SOD2. Abrogation of this feedback regulation by simultaneous knockdown of C/EBP-β and Sirt3 exacerbated mitochondrial superoxide accumulation and culminated into endothelial cell death upon prolonged culture. Taken together, Sirt3 deficiency induces a mild, superoxide-dependent endothelial dysfunction in mice fed a high-cholesterol diet. In cultured endothelial cells, a novel C/EBP-β-dependent rescue mechanism maintains net SOD2 activity upon transient knockdown of Sirt3.
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Affiliation(s)
- Stephan Winnik
- Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Raemistr. 100, 8091, Zurich, Switzerland. .,Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland.
| | - Daniel S Gaul
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Giovanni Siciliani
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland
| | - Christine Lohmann
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland
| | - Lisa Pasterk
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland.,Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Graz, Austria
| | - Natacha Calatayud
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland
| | - Julien Weber
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland
| | - Urs Eriksson
- Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland.,Division of Cardiology, Department of Medicine, GZO Regional Health Center Wetzikon, Wetzikon, Switzerland
| | - Johan Auwerx
- Laboratory of Integrative Systems Physiology, School of Life Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | | | - Thomas F Lüscher
- Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Raemistr. 100, 8091, Zurich, Switzerland.,Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Christian M Matter
- Department of Cardiology, University Heart Center Zurich, University Hospital Zurich, Raemistr. 100, 8091, Zurich, Switzerland. .,Center for Molecular Cardiology, University of Zurich, Schlieren, Switzerland. .,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.
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Zhang C, Wu J, Xu X, Potter BJ, Gao X. Direct relationship between levels of TNF-alpha expression and endothelial dysfunction in reperfusion injury. Basic Res Cardiol 2010; 105:453-64. [PMID: 20091314 DOI: 10.1007/s00395-010-0083-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 12/29/2009] [Accepted: 12/30/2009] [Indexed: 12/12/2022]
Abstract
We previously found that myocardial ischemia/reperfusion (I/R) initiates expression of tumor necrosis factor-alpha (TNF) leading to coronary endothelial dysfunction. However, it is not clear whether there is a direct relationship between levels of TNF expression and endothelial dysfunction in reperfusion injury. We studied levels of TNF expression by using different transgenic animals expressing varying amounts of TNF in I/R. We crossed TNF overexpression (TNF(++/++)) with TNF knockout (TNF(-/-)) mice; thus we have a heterozygote population of mice with the expression of TNF "in between" the TNF(-/-) and TNF(++/++) mice. Mouse hearts were subjected to 30 min of global ischemia followed by 90 min of reperfusion and their vasoactivity before and after I/R was examined in wild type (WT), TNF(-/-), TNF(++/++) and TNF heterozygote (TNF(-/++), cross between TNF(-/-) and TNF(++/++)) mice. In heterozygote TNF(-/++) mice with intermediate cardiac-specific expression of TNF, acetylcholine-induced or flow-induced endothelial-dependent vasodilation following I/R was between TNF(++/++) and TNF(-/-) following I/R. Neutralizing antibodies to TNF administered immediately before the onset of reperfusion-preserved endothelial-dependent dilation following I/R in WT, TNF(-/++) and TNF(++/++) mice. In WT, TNF(-/++) and TNF(++/++) mice, I/R-induced endothelial dysfunction was progressively lessened by administration of free-radical scavenger TEMPOL immediately before initiating reperfusion. During I/R, production of superoxide (O(2) (.-)) was greatest in TNF(++/++) mice as compared to WT, TNF(-/++) and TNF(-/-) mice. Following I/R, arginase mRNA expression was elevated in the WT, substantially elevated in the TNF(-/++) and TNF(++/++) mice and not affected in the TNF(-/-) mice. These results suggest that the level of TNF expression determines arginase expression in endothelial cells during myocardial I/R, which is one of the mechanisms by which TNF compromises coronary endothelial function in reperfusion injury.
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Affiliation(s)
- Cuihua Zhang
- Department of Internal Medicine, Medical Pharmacology and Physiology and Nutritional Sciences, Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, USA.
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Loot AE, Schreiber JG, Fisslthaler B, Fleming I. Angiotensin II impairs endothelial function via tyrosine phosphorylation of the endothelial nitric oxide synthase. ACTA ACUST UNITED AC 2009; 206:2889-96. [PMID: 19934023 PMCID: PMC2806451 DOI: 10.1084/jem.20090449] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Proline-rich tyrosine kinase 2 (PYK2) can be activated by angiotensin II (Ang II) and reactive oxygen species. We report that in endothelial cells, Ang II enhances the tyrosine phosphorylation of endothelial NO synthase (eNOS) in an AT1-, H2O2-, and PYK2-dependent manner. Low concentrations (1–100 µmol/liter) of H2O2 stimulated the phosphorylation of eNOS Tyr657 without affecting that of Ser1177, and attenuated basal and agonist-induced NO production. In isolated mouse aortae, 30 µmol/liter H2O2 induced phosphorylation of eNOS on Tyr657 and impaired acetylcholine-induced relaxation. Endothelial overexpression of a dominant-negative PYK2 mutant protected against H2O2-induced endothelial dysfunction. Correspondingly, carotid arteries from eNOS−/− mice overexpressing the nonphosphorylatable eNOS Y657F mutant were also protected against H2O2. In vivo, 3 wk of treatment with Ang II considerably increased levels of Tyr657-phosphorylated eNOS in the aortae of wild-type but not Nox2y/− mice, and this was again associated with a clear impairment in endothelium-dependent vasodilatation in the wild-type but not in the Nox2y/− mice. Collectively, endothelial PYK2 activation by Ang II and H2O2 causes the phosphorylation of eNOS on Tyr657, attenuating NO production and endothelium-dependent vasodilatation. This mechanism may contribute to the endothelial dysfunction observed in cardiovascular diseases associated with increased activity of the renin–angiotensin system and elevated redox stress.
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Affiliation(s)
- Annemarieke E Loot
- Institute for Vascular Signaling, Center for Molecular Medicine, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany.
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Vascular control in humans: focus on the coronary microcirculation. Basic Res Cardiol 2009; 104:211-27. [PMID: 19190954 DOI: 10.1007/s00395-009-0775-y] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2008] [Accepted: 12/15/2008] [Indexed: 12/27/2022]
Abstract
Myocardial perfusion is regulated by a variety of factors that influence arteriolar vasomotor tone. An understanding of the physiological and pathophysiological factors that modulate coronary blood flow provides the basis for the judicious use of medications for the treatment of patients with coronary artery disease. Vasomotor properties of the coronary circulation vary among species. This review highlights the results of recent studies that examine the mechanisms by which the human coronary microcirculation is regulated in normal and disease states, focusing on diabetes. Multiple pathways responsible for myogenic constriction and flow-mediated dilation in human coronary arterioles are addressed. The important role of endothelium-derived hyperpolarizing factors, their interactions in mediating dilation, as well as speculation regarding the clinical significance are emphasized. Unique properties of coronary arterioles in human vs. other species are discussed.
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Green and black tea are equally potent stimuli of NO production and vasodilation: new insights into tea ingredients involved. Basic Res Cardiol 2009; 104:100-10. [DOI: 10.1007/s00395-008-0759-3] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Accepted: 10/14/2008] [Indexed: 10/21/2022]
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Bibliography. Current world literature. Atherosclerosis: cell biology and lipoproteins. Curr Opin Lipidol 2008; 19:525-35. [PMID: 18769235 DOI: 10.1097/mol.0b013e328312bffc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Zhang C. The role of inflammatory cytokines in endothelial dysfunction. Basic Res Cardiol 2008; 103:398-406. [PMID: 18600364 DOI: 10.1007/s00395-008-0733-0] [Citation(s) in RCA: 320] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2008] [Accepted: 06/04/2008] [Indexed: 02/02/2023]
Abstract
Clinical and experimental data support a link between endothelial dysfunction and inflammation. Inflammatory cytokines are important protagonists in formation of atherosclerotic plaque, eliciting effects throughout the atherosclerotic vessel. Importantly, the development of atherosclerotic lesions, regardless of the risk factor, e.g., diabetes, hypertension, obesity, is characterized by disruption in normal function of the endothelial cells. Endothelial cells, which line the internal lumen of the vasculature, are part of a complex system that regulates vasodilation and vasoconstriction, growth of vascular smooth muscle cells, inflammation, and hemostasis, maintaining a proper blood supply to tissues and regulating inflammation and coagulation. Current concepts suggest that the earliest event in atherogenesis is endothelial dysfunction, manifested by deficiencies in the production of nitric oxide (NO) and prostacyclin. The focus of this review is to summarize recent evidence showing the effects of inflammation on vascular dysfunction in ischemic-heart disease, which may prompt new directions for targeting inflammation in future therapies.
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Affiliation(s)
- Cuihua Zhang
- Department of Internal Medicine, University of Missouri, Columbia, MO 65211, USA.
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Drelicharz L, Kozlovski V, Skorka T, Heinze-Paluchowska S, Jasinski A, Gebska A, Guzik T, Olszanecki R, Wojnar L, Mende U, Csanyi G, Chlopicki S. NO and PGI(2) in coronary endothelial dysfunction in transgenic mice with dilated cardiomyopathy. Basic Res Cardiol 2008; 103:417-30. [PMID: 18431525 DOI: 10.1007/s00395-008-0723-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2007] [Accepted: 03/11/2008] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The aim of the present work was to analyze coronary endothelial function in the transgenic mouse model of dilated cardiomyopathy (Tgalphaq*44 mice). METHODS Coronary vasodilatation, both NO-dependent (induced by bradykinin) and PGI(2)-dependent (induced by acetylcholine), was assessed in the isolated hearts of Tgalphaq*44 and FVB mice. Cardiac function was analyzed in vivo (MRI). RESULTS In Tgalphaq*44 mice at the age of 2-4 months cardiac function was preserved and there were no alterations in endothelial function. By contrast, in Tgalphaq*44 mice at the age of 14-16 months cardiac function was significantly impaired and NO, but not PGI(2)-dependent coronary function was altered. Interestingly, the basal level of PGI(2) in coronary circulation increased fourfold as compared to FVB mice. Cardiac O(2) (-) production increased 1.5-fold and 3-fold in Tgalphaq*44 vs. FVB mice at the age of 2-6 and 14-16 months, respectively, and was inhibited by apocynin. Interestingly, inhibition of NADPH oxidase or NOS-3 normalized augmented PGI(2) production in Tgalphaq*44 mice. There was also an increased expression of gp91phox in Tgalphaq*44 vs. FVB hearts, without evident alterations in the expression of COX-1, COX-2, NOS-3 and PGI(2)-synthase. CONCLUSIONS In the mouse model of dilated cardiomyopathy, endothelial dysfunction in coronary circulation is present in the late but not the early stage of heart failure pathology and is characterized by a decrease in NO bioavailability and a compensatory increase in PGI(2). Both the decrease in NO activity and the increase in PGI(2) activity may result from excessive O(2) (-) production by cardiac NADPH oxidase in Tgalphaq*44 hearts.
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Affiliation(s)
- Lukasz Drelicharz
- Dept. of Experimental Pharmacology, Jagiellonian University Medical College, Grzegorzecka 16, Krakow, 31-531, Poland
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Age-dependent endothelial dysfunction is associated with failure to increase plasma nitrite in response to exercise. Basic Res Cardiol 2008; 103:291-7. [PMID: 18347836 DOI: 10.1007/s00395-008-0714-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Accepted: 01/29/2008] [Indexed: 10/22/2022]
Abstract
Age-dependent alterations of the vessel wall may predispose older individuals to increased cardiovascular pathology. Aging is associated with an impaired bioactivity of nitric oxide (NO). Plasma nitrite reflects NO-synthase activity under fasting conditions and is an important storage pool of NO. To test the hypothesis that aging is associated with an impaired capacity of the vasculature to increase plasma nitrite during exercise, 29 young and 28 old healthy individuals (25 +/- 1 years and 58 +/- 2 years; P < 0.001) without major cardiovascular risk factors were enrolled. Exercise stress was similar in both groups. Baseline nitrite did not differ (107 +/- 8 vs. 82 +/- 10 nmol/l, young vs. old; n.s.) although a trend toward higher nitrite levels in young individuals was seen. In young subjects, exercise increased plasma nitrite by 38 +/- 7% (P < 0.001) compared to only 13 +/- 8% (P = n.s.) in older subjects. L-NMMA blocked increases of nitrite. Endothelial function, as defined by flow-mediated-dilation (FMD) of the brachial artery via ultrasound, was impaired in older subjects (5.4 +/- 0.4% vs. 6.7 +/- 0.3%; P < 0.01). Multivariate analysis showed that age (P = 0.007), BMI (P = 0.010), and LDL (P = 0.021) were independent predictors of nitrite increase. The fact that aging is associated with an impaired capacity of the vasculature to adequately increase nitrite to physiological stimuli may contribute to attenuated maintenance and further deterioration of vascular homeostasis with aging.
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Effects of pentoxifylline on the vascular response to injury after angioplasty in rabbit iliac arteries. Basic Res Cardiol 2007; 103:257-64. [DOI: 10.1007/s00395-007-0694-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2007] [Accepted: 11/22/2007] [Indexed: 10/22/2022]
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