Atherosclerosis accounts for half of the morbidity and
|
|
- Owen Hunt
- 5 years ago
- Views:
Transcription
1 Brief Rapid Communications Reduced Endothelial Nitric Oxide Synthase Expression and Production in Human Atherosclerosis Barry S. Oemar, MD; Marcel R. Tschudi, PhD; Nelson Godoy, MD; Victor Brovkovich, PhD; Tadeusz Malinski, PhD; Thomas F. Lüscher, MD Background NO regulates vascular tone and structure, platelets, and monocytes. NO is synthesized by endothelial NO synthase (enos). Endothelial dysfunction occurs in atherosclerosis. Methods and Results With a porphyrinic microsensor, NO release was measured in atherosclerotic human carotid arteries and normal mammary arteries obtained during surgery. enos protein expression was analyzed by immunohistochemistry. In normal arteries, the initial rate of NO release after stimulation with calcium ionophore A23187 (10 mol/l) was ( mol/l)/s (n 10). In contrast, the initial rate of NO release was markedly reduced in atherosclerotic segments, to ( mol/l)/s (n 10, P ). NO peak concentration in normal arteries was mol/l (n 10) and in atherosclerotic segments, mol/l (n 10, P ). Reduced NO release in atherosclerotic segments was accompanied by marked reduction of immunoreactive enos in luminal endothelial cells, although specific endothelial cell markers (CD31) were present (n 13). Endothelial cells of vasa vasorum of atherosclerotic segments, however, remained positive for enos, as was the endothelium of normal arteries. Conclusions In clinically relevant human atherosclerosis, enos protein expression and NO release are markedly reduced. This may be involved in the progression of atherosclerosis. (Circulation. 1998;97: ) Key Words: atherosclerosis arteries endothelium nitric oxide stroke Atherosclerosis accounts for half of the morbidity and mortality in Western countries. Its pathogenesis, however, is not clear. Risk factors of atherosclerosis, ie, LDL levels, diabetes mellitus, hypertension, and smoking, are associated with vascular dysfunction, including monocyte adhesion and invasion, smooth muscle proliferation and migration, platelet activation, and extracellular matrix formation. 1,2 In animal models, the endothelial NO pathway appears to be involved in atherosclerosis. 3 6 However, little is known about this in human atherosclerosis. 7 In endothelial cells, NO is formed from L-arginine 8,9 by enos. 10 enos is constitutively expressed and activated by cell surface receptors or mechanical forces such as shear stress and stretch. 1,11 NO relaxes vascular smooth muscle, inhibits platelet activation, and modulates migration and growth of vascular smooth muscle. Furthermore, NO regulates genes that lead to the expression of adhesion molecules for monocytes Indirect evidence suggests that alterations in the NO pathway might be involved in endothelial dysfunction and atherosclerosis. In hypercholesterolemia and atherosclerosis, endothelium-dependent relaxation is reduced. 3 5 Chronic administration of L-arginine to hypercholesterolemic animals improves endothelium-dependent relaxation. 6 In patients with coronary artery disease, basal NO release seems to be impaired, as suggested by a blunted response to L-NMMA. 7 However, in human atherosclerosis, no direct measurement of NO release or NOS protein has been reported. This study presents the first direct evidence that NO release and enos expression are markedly reduced in clinically manifest human atherosclerosis. Methods Blood Vessels Thirty-five arteries of patients undergoing carotid atherectomy or coronary bypass surgery were collected. For NO measurement, carotid arteries from 10 patients (mean age, 66 years; range, 53 to 78 years) and IMAs (normal segments) from 10 age-matched control subjects (mean age, 66 years; range, 54 to 75 years; P NS) were used. The presence or absence of atherosclerosis was confirmed visually, microscopically, and by histology. The absence of atherosclerosis in IMAs is in line with previous studies. 15 Immunohistochemistry for enos and CD31 was performed in 13 carotid arteries and 2 IMAs. Porphyrinic NO Microsensor Measurements of NO were carried out with a porphyrinic microsensor as described 16,17 immediately after surgical removal of segments ( 30 minutes). The amperometric signal was recorded with a chart recorder (Recom Electronic AG), and NO concentration was determined from the measured current by means of a calibration curve Received March 3, 1998; revision received April 21, 1998; accepted April 28, From Cardiovascular Research, Institute of Physiology, University of Zürich (B.S.O., M.R.T.); Cardiology, University Hospital Zürich (T.F.L.); and Neurosurgery, University Hospital Bern (N.G.), Switzerland; and the Department of Chemistry, Institute of Biotechnology, Oakland University, Rochester, Minn (V.B., T.M.). Correspondence to Thomas F. Lüscher, MD, Professor and Head of Cardiology, University Hospital Zürich, CH-8091 Zürich, Switzerland. karluh@usz.unizh.ch 1998 American Heart Association, Inc. 2494
2 Oemar et al June 30, Selected Abbreviations and Acronyms enos endothelial NO synthase IMA internal mammary artery L-NMMA N G -monomethyl-l-arginine NOS NO synthase with NO standards. Standard NO solutions (1.8 mmol/l) were prepared from aqueous solution saturated with pure gaseous NO (Garbagas). Experimental Protocols Isolated vascular segments were cut longitudinally and pinned on the bottom of organ chambers filled with fresh HBSS buffer. The active tip of the L-shaped NO microsensor was placed on the endothelial surface of the IMA or carotid strips. A precision stereo zoom microscope (PZM) and a micromanipulator (M3301) were used for positioning. Ten microliters of a 10 mol/l calcium ionophore A23187 solution was injected on the luminal side of the vascular strips with a pneumatic picoinjector (PV820) positioned with a micromanipulator (PZM, PV820, and M3301 are all from World Precision Instruments). In each tissue sample, NO release was measured at 3 different anatomic sites. Immunohistochemistry Serial paraformaldehyde-fixed paraffin sections were mounted onto silane-coated slides, dewaxed and rehydrated, washed in PBS, and incubated in 1 g/ml anti-enos monoclonal antibodies (Transduction Laboratories; 2 hours at room temperature or overnight at 4 C). Adjacent sections were incubated in a 1:100 dilution of primary monoclonal antibodies for CD-31 (JC/70A; Dako) or preimmune control serum for 2 hours at room temperature, washed in PBS for 10 minutes, incubated in biotinylated secondary antibody for 30 minutes at room temperature, and visualized by use of the avidin-biotinperoxidase labeling system (ABC-elite kit; Vector Laboratories). Sections were counterstained with hematoxylin and mounted with Kaiser s solution (Merck). Calculations and Statistical Analysis For statistical analysis, the initial rate of NO release [slope of NO peak, ( mol/l)/s] and the maximal concentration of NO produced (NO peak; mol/l) were measured. In each tissue sample, NO release was measured at 3 different anatomic sites, and the mean value was calculated for n 1. In each set of experiments, n is the number of blood vessels studied. Data are given as mean SEM. Statistical analysis was performed with unpaired Student s t test. Values of P 0.05 were considered statistically significant. Results NO Release Representative amperometric curves of NO release are shown in Figure 1A. In normal segments, a rapid release of NO was observed after injection of 10 mol/l calcium ionophore A23187 solution (Figure 1A, top). In contrast, the initial rate of NO release and NO peak concentration were significantly reduced in atherosclerotic carotid arteries (Figure 1A, bottom). The initial rate of NO release after calcium ionophore administration was ( mol/l)/s in normal arteries but only ( mol/l)/s in atherosclerotic carotid arteries (Figure 1B, left; n 10, P ). NO peak concentration was mol/l in normal arteries but was reduced to mol/l in atherosclerotic arteries (Figure 1B, right; n 10, P ). Figure 1. A, Amperograms of NO release from normal IMA (top) and atherosclerotic carotid artery (bottom) to calcium ionophore A23187 (10 mol/l) measured on endothelial surface with a porphyrinic microsensor. B, Initial rate of NO release (left) and maximal concentration of NO (right) to calcium ionophore A23187 (10 mol/l) of isolated IMAs (solid bars) and carotid arteries (open bars). Values are mean SEM (P , n 10). Expression of enos Labeling of normal arterial segments with monoclonal antibody for enos revealed high-level expression of enos in luminal endothelial cells (Figure 2A). In contrast, immunoreactive enos was undetectable in luminal endothelial cells of carotid segments with advanced atherosclerosis (Figure 3A). However, endothelial cells of the vasa vasorum inside the atherosclerotic plaques were strongly positive for enos staining (Figure 4A and 4C), indicating that the negative staining in luminal endothelial cells was not due to technical failure but rather reflects downregulation of the enzyme. Smooth muscle cells of normal segments and of atherosclerotic carotid arteries as well as foam cells and macrophages in the plaque were negative for enos. Expression of Endothelial Cell Marker Anti-CD31 staining, a specific marker for endothelial cells, was positive in all instances, indicating the presence of endothelial cells (Figures 2C, 3C, and 4D) and demonstrating that both enos-expressing cells in normal arterial segments and enos-negative cells in atherosclerotic carotid arteries were indeed endothelial cells. The negative staining with control serum demonstrated the specificity of both anti-enos and anti-cd31 antibodies (Figures 2B, 3B, and 4B).
3 2496 enos and Human Atherosclerosis Figure 2. Immunohistology of normal IMA. Serial sections were labeled with anti-enos antibody (A), control nonimmune serum (B), or monoclonal anti-cd31 antibody (C). Positive staining is indicated by dark purple color of luminal endothelial cells. Positive staining for enos (A) demonstrated normal expression of enos protein in CD31-positive (C) endothelial cells. Arrows indicate position of internal elastic lamina. Sections were counterstained with hematoxylin. Magnification 400. LU indicates lumen. Discussion This study provides the first direct evidence that NOS protein expression and NO release are diminished in advanced human atherosclerosis. Initial and peak NO release as determined by direct in situ measurement with a porphyrinic sensor were markedly reduced in atherosclerotic carotid arteries. The impaired NO release was accompanied by a substantial reduction of immunoreactive enos protein in luminal endothelial cells of atherosclerotic plaques but not in vasa vasorum. Figure 3. Immunohistology of atherosclerotic carotid artery. Serial sections were labeled with anti-enos antibody (A), control nonimmune serum (B), or monoclonal anti-cd31 antibody (C). Positive staining is indicated by dark purple color of luminal endothelial cells. Negative staining for enos (A) demonstrated diminished expression of enos protein in CD31-positive (C) endothelial cells. Arrows indicate intact endothelial cell layer in these areas. Sections were counterstained with hematoxylin. Magnification 400. LU indicates lumen. Endothelial NO plays an important role in vascular homeostasis, adhesion of white blood cells, and platelet function. 10 There are at least 3 major mechanisms in the NO pathway that may lead to endothelial dysfunction and consequently atherogenesis: (1) functional abnormalities of NOS due to substrate or cofactor deficiency 10,18 ; (2) increased breakdown of NO 3,5 ; or (3) reduced expression of enos. Until now, even with invasive in vivo studies in humans, no clear distinction between these possibilities could be made. 7 Moreover, studies of the NO pathway in rabbit models of
4 Oemar et al June 30, Figure 4. Immunohistology of atherosclerotic carotid artery. Serial sections were labeled with anti-enos antibody (A and C), control nonimmune serum (B), or monoclonal anti-cd31 antibody (D). Positive staining is indicated by dark purple color. Endothelial cells of vasa vasorum inside plaque are positive for enos. Positive labeling for CD31 confirms endothelial cells. Sections were counterstained with hematoxylin. Magnification 400. atherosclerosis gave unexpected results, ie, both enos protein and mrna are increased in the atherosclerotic aorta of these animals, despite impaired endothelium-dependent vascular relaxation (most likely due to inactivation of NO by superoxide 4 ). In contrast, our results provide the first direct evidence that enos protein expression is markedly diminished in advanced human atherosclerosis and NO release is reduced. These findings are supported by studies in explanted vein grafts in which enos expression is reduced only in diseased segments. 19 The differences in NO release observed in normal and atherosclerotic segments were mirrored by marked differences in NOS expression and are in line with previous work showing potent endothelium-dependent relaxations in normal mammary arteries 20 and reduced responses in atherosclerotic human coronary arteries. 21 We confirmed the presence of endothelial cells in both normal and atherosclerotic segments by light microscopy and by endothelial cell marker (CD31). A heterogeneity in vascular beds is an unlikely explanation for the observed differences, because both mammary and carotid arteries are branches of the subclavian artery and brachiocephalic trunk. Differences in NO production due to anatomic heterogeneity in receptor expression could be excluded by use of the receptor-independent agonist calcium ionophore. Moreover, the amount of NO released from normal arteries was comparable to that of other normal vessels. 17 Finally, it should be noted that IMA samples were obtained from age-matched patients with documented atherosclerosis in the coronary circulation and angiographically normal mammary artery. The discrepancies between our findings in human atherosclerosis and animal models might be explained by the duration of the atherosclerotic process, ie, months in Watanabe rabbits versus decades in patients. Furthermore, the severity of clinically relevant lesions and species differences may play a role. Indeed, vascular lesions of hypercholesterolemic rabbits mimic human plaques only in part. Nevertheless, it is conceivable that enos protein expression and NO release may be normal or increased in early human atherosclerosis, whereas at later stages NOS expression and NO release are reduced. Hence, abnormal endothelium-dependent responses during early atherosclerosis might be due to reduced substrate and/or cofactor concentrations or increased superoxide formation. This could explain why the administration of L-arginine 22 or the cofactor tetrahydrobiopterin 18 improves endothelial function only in early stages of atherosclerosis and in the microcirculation, where no plaques develop, but not in epicardial coronary arteries of patients with clinically relevant coronary disease. 22 Thus, at later stages of the atherosclerotic process, when enos expression and NO production are decreased, these therapies are no longer effective.
5 2498 enos and Human Atherosclerosis Acknowledgments This work was supported by Swiss National Science Foundation grants , , and /1; the Swiss Cardiology Foundation; and in part by grant HL from the US Public Health Service. The help of Drs D.S. Hartman, K. Hischikawa, and M. Pech is appreciated. References 1. Lüscher TF, Noll G. The endothelium in coronary vascular control. Heart Disease. 1995;Update 3: Ross R. The pathogenesis of atherosclerosis: a perspective for the 1990s. Nature. 1993;362: Harrison DG, Freiman PC, Armstrong ML, Marcus ML, Heistad DD. Alterations of vascular reactivity in atherosclerosis. Circ Res. 1987;61: Kanazawa K, Kawashima S, Mikami S, Miwa Y, Hirata K, Suematsu M, Hayashi Y, Itoh H, Yokoyama M. Endothelial constitutive nitric oxide synthase protein and mrna increased in rabbit atherosclerotic aorta despite impaired endothelium-dependent vascular relaxation. Am J Pathol. 1996;148: Minor R Jr, Myers PR, Guerra R Jr, Bates JN, Harrison DG. Diet-induced atherosclerosis increases the release of nitrogen oxides from rabbit aorta. J Clin Invest. 1990;86: Cooke JP, Singer AH, Tsao P, Zera P, Rowan RA, Billingham ME. Antiatherogenic effects of L-arginine in the hypercholesterolemic rabbit. J Clin Invest. 1992;90: Quyyumi AA, Dakak N, Mulcahy D, Andrews NP, Husain S, Panza JA, Cannon RO. Nitric oxide activity in the atherosclerotic human coronary circulation. J Am Coll Cardiol. 1997;29: Palmer RM, Ferrige AG, Moncada S. Nitric oxide release accounts for the biological activity of endothelium-derived relaxing factor. Nature. 1987; 327: Palmer RM, Ashton DS, Moncada S. Vascular endothelial cells synthesize nitric oxide from L-arginine. Nature. 1988;333: Cooke JP, Dzau VJ. Nitric oxide synthase: role in the genesis of vascular disease. Annu Rev Med. 1997;48: Topper JN, Cai J, Falb D, Gimbrone MA Jr. Identification of vascular endothelial genes differentially responsive to fluid mechanical stimuli: cyclooxygenase-2, manganese superoxide dismutase, and endothelial cell nitric oxide synthase are selectively up-regulated by steady laminar shear stress. Proc Natl Acad Sci U S A. 1996;93: Khan BV, Harrison DG, Olbrych MT, Alexander RW, Medford RM. Nitric oxide regulates vascular cell adhesion molecule 1 gene expression and redox-sensitive transcriptional events in human vascular endothelial cells. Proc Natl Acad Sci U S A. 1996;93: Takahashi M, Ikeda U, Masuyama JI, Funayama H, Kano S, Shimada K. Nitric oxide attenuates adhesion molecule expression in human endothelial cells. Cytokine. 1996;8: Tsao PS, Buitrago R, Chan JR, Cooke JP. Fluid flow inhibits endothelial adhesiveness: nitric oxide and transcriptional regulation of VCAM-1. Circulation. 1996;94: Sims FH. The pathology of the internal thoracic artery and its contribution to the study of atherosclerosis. In: Green GE, Singh RN, Sosa JA, eds. Surgical Revascularization of the Heart: The Internal Thoracic Arteries. New York, NY: Igaku-Shoin; 1991; Malinski T, Taha Z. Nitric oxide release from a single cell measured in situ by a porphyrinic-based microsensor. Nature. 1992;358: Tschudi MR, Barton M, Bersinger NA, Moreau P, Cosentino F, Noll G, Malinski T, Lüscher TF. Effect of age on kinetics of nitric oxide release in rat aorta and pulmonary artery. J Clin Invest. 1996;98: Stroes E, Kastelein J, Cosentino F, Erkelens W, Wever R, Koomans H, Lüscher T, Rabelink T. Tetrahydrobiopterin restores endothelial function in hypercholesterolemia. J Clin Invest. 1997;99: Buttery LD, Chester AH, Springall DR, Borland JA, Michel T, Yacoub MH, Polak JM. Explanted vein grafts with an intact endothelium demonstrate reduced focal expression of endothelial nitric oxide synthase specific to atherosclerotic sites. J Pathol. 1996;179: Lüscher TF, Diederich D, Siebenmann R, Lehmann K, Stulz P, von Segesser L, Yang ZH, Turina M, Grädel E, Weber E, Bühler FR. Difference between endothelium-dependent relaxation in arterial and in venous coronary bypass grafts. N Engl J Med. 1988;319: Bossaller C, Habib GB, Yamamoto H, Williams C, Wells S, Henry PD. Impaired muscarinic endothelium-dependent relaxation and cyclic guanosine 5 -monophosphate formation in atherosclerotic human coronary artery and rabbit aorta. J Clin Invest. 1987;79: Drexler H, Zeiher AM, Meinzer K, Just H. Correction of endothelial dysfunction in coronary microcirculation of hypercholesterolaemic patients by L-arginine. Lancet. 1991;338:
ATHEROSCLEROSIS زيد ثامر جابر. Zaid. Th. Jaber
ATHEROSCLEROSIS زيد ثامر جابر Zaid. Th. Jaber Objectives 1- Review the normal histological features of blood vessels walls. 2-define the atherosclerosis. 3- display the risk factors of atherosclerosis.
More informationPCTH 400. Endothelial dysfunction and cardiovascular diseases. Blood vessel LAST LECTURE. Endothelium. High blood pressure
PCTH 400 LAST LECTURE Endothelial dysfunction and cardiovascular diseases. Classic Vascular pharmacology -chronic -systemic Local Vascular pharmacology -acute -targeted High blood pressure Blood pressure
More informationInvited Review. Vascular smooth muscle cell proliferation in the pathogenesis of atherosclerotic cardiovascular diseases
Histol Histopathol (2000) 15: 557-571 Histology and Histopathology Cellular and Molecular Biology Invited Review Vascular smooth muscle cell proliferation in the pathogenesis of atherosclerotic cardiovascular
More informationThe dynamic regulation of blood vessel caliber
INVITED BASIC SCIENCE REVIEW The dynamic regulation of blood vessel caliber Colleen M. Brophy, MD, Augusta, Ga BACKGROUND The flow of blood to organs is regulated by changes in the diameter of the blood
More informationBlood Vessel Mechanics
Blood Vessel Mechanics Ying Zheng, Ph.D. Department of Bioengineering BIOEN 326 11/01/2013 Blood Vessel Structure A Typical Artery and a Typical Vein Pressure and Blood Flow Wall stress ~ pressure Poiseuille
More informationEffect of L-Arginine on Human Coronary Endothelium-Dependent and Physiologic Vasodilation
1220 JACC Vol. 30, No. 5 Effect of L-Arginine on Human Coronary Endothelium-Dependent and Physiologic Vasodilation ARSHED A. QUYYUMI, MD, FACC, NADER DAKAK, MD, JEAN G. DIODATI, MD, FACC, DAVID M. GILLIGAN,
More informationThe Role of Massage in Blood Circulation, Pain Relief, and the Recovery Process: Implications of Existing Research
The Role of Massage in Blood Circulation, Pain Relief, and the Recovery Process: Implications of Existing Research I. Basic Physiology of Circulation A. The Vascular Endothelium The endothelium is a complex
More informationThe 1,4-dihydropyridine known as nifedipine is a commonly
Synergistic Antihypertensive Effects of Nifedipine on Endothelium Concurrent Release of NO and Scavenging of Superoxide Viktor Brovkovych, Leszek Kalinowski, Reiner Muller-Peddinghaus, Tadeusz Malinski
More informationThe Study of Endothelial Function in CKD and ESRD
The Study of Endothelial Function in CKD and ESRD Endothelial Diversity in the Human Body Aird WC. Circ Res 2007 Endothelial Diversity in the Human Body The endothelium should be viewed for what it is:
More informationVascular Biology Anatomy and Function of Blood Vessels in Health Fig. 1.1 Endothelial Function Three Layers of Arteries
1 Vascular Biology Scott Kinlay, MBBS, PhD, FACC, FRACP Vascular Biology applies to processes affecting arteries, veins, and other blood vessels. This chapter will focus on the physiology and pathophysiology
More informationRoles of Flow Mechanics in Vascular Cell Biology in Health and Disease
Roles of Flow Mechanics in Vascular Cell Biology in Health and Disease Shu Chien Dept. of Bioengineering & Medicine UC, San Diego Presented by Ming-Shaung Ju Dept. of Mech. Eng., NCKU, Tainan Background
More informationClassification of Endothelial Dysfunction. Stefano Taddei Department of Internal Medicine University of Pisa, Italy
Classification of Endothelial Dysfunction Stefano Taddei Department of Internal Medicine University of Pisa, Italy Pathogenesis of atherosclerosis from endothelial dysfunction to clinical disease endothelial
More informationPathology of Coronary Artery Disease
Pathology of Coronary Artery Disease Seth J. Kligerman, MD Pathology of Coronary Artery Disease Seth Kligerman, MD Assistant Professor Medical Director of MRI University of Maryland Department of Radiology
More informationDyslipidemia Endothelial dysfunction Free radicals Immunologic
ATHEROSCLEROSIS Hossein Mehrani Professor of Clinical Biochemistry Definition Atherosclerosis: Is a chronic inflammatory process characterized by plaque formation within the vessel wall of arteries and
More informationEndothelium. A typical endothelial cell is about 30mm long, Accounts for 1% or less of the arterial weight
Endothelium Discovered in 1845 A typical endothelial cell is about 30mm long, 10mm wide, and 0.2 3 mm thick Accounts for 1% or less of the arterial weight As recently as the late 1960s it was thought of
More informationVascular disease. Structural evaluation of vascular disease. Goo-Yeong Cho, MD, PhD Seoul National University Bundang Hospital
Vascular disease. Structural evaluation of vascular disease Goo-Yeong Cho, MD, PhD Seoul National University Bundang Hospital resistance vessels : arteries
More informationEVects of L- and D-arginine on the basal tone of human diseased coronary arteries and their responses to substance P
Heart 1999;81:55 511 55 Cardiology Unit, Hippokration Hospital, Athens University Medical School, Athens, Greece D Tousoulis C Tentolouris G Katsimaglis C Stefanadis P Toutouzas Cardiology Unit, Imperial
More informationCardiology, CardioVascular Center University Hospital Zurich Zurich, Switzerland
Modification of by the lipoxidation product malondialdehyde leads to LOX-1 dependent activation of endothelial PKCbeta-2 and adverse endothelial effects of in patients with coronary artery disease Christian
More informationROLE OF INFLAMMATION IN HYPERTENSION. Dr Barasa FA Physician Cardiologist Eldoret
ROLE OF INFLAMMATION IN HYPERTENSION Dr Barasa FA Physician Cardiologist Eldoret Outline Inflammation in CVDs the evidence Basic Science in Cardiovascular inflammation: The Main players Inflammation as
More informationDistribution of type IV collagen, laminin, nidogen and fibronectin in the haemodynamically stressed vascular wall
Histol Histopath (1 990) 5: 161-1 67 Histology and Histopathology Distribution of type IV collagen, laminin, nidogen and fibronectin in the haemodynamically stressed vascular wall Reinhold Kittelberger,
More informationEuropean Heart Journal (1999) 20, Article No. euhj , available online at on
European Heart Journal (1999) 20, 1676 1680 Article No. euhj.1999.1689, available online at http://www.idealibrary.com on Vitamin C improves endothelial function of epicardial coronary arteries in patients
More informationCardiovascular Division, Brigham and Women s Hospital, Harvard Medical School
Low Endothelial Shear Stress Upregulates Atherogenic and Inflammatory Genes Extremely Early in the Natural History of Coronary Artery Disease in Diabetic Hyperlipidemic Juvenile Swine Michail I. Papafaklis,
More informationL-Arginine infusion has no effect on systemic haemodynamics in
Br J clin Pharmac 1993; 36: 45-49 L-Arginine infusion has no effect on systemic haemodynamics in normal volunteers, or systemic and pulmonary haemodynamics in patients with elevated pulmonary vascular
More informationRelationship between serum glutathione peroxidase-1activity with endothelial dysfunction level in patients with coronary artery diseases
Relationship between serum glutathione peroxidase-1activity with endothelial dysfunction level in patients with coronary artery diseases Introduction Reactive oxygen species (ROS),such as superoxide and
More informationIt is believed that physiological shear stress exerts atheroprotective
Chronic Physiological Shear Stress Inhibits Tumor Necrosis Factor Induced Proinflammatory Responses in Rabbit Aorta Perfused Ex Vivo Hideyuki Yamawaki, DVM, PhD; Stephanie Lehoux, PhD; Bradford C. Berk,
More informationJournal of the American College of Cardiology Vol. 35, No. 2, by the American College of Cardiology ISSN /00/$20.
Journal of the American College of Cardiology Vol. 35, No. 2, 2000 2000 by the American College of Cardiology ISSN 0735-1097/00/$20.00 Published by Elsevier Science Inc. PII S0735-1097(99)00553-7 Effects
More informationEicosapentaenoic Acid and Docosahexaenoic Acid: Are They Different?
Eicosapentaenoic Acid and Docosahexaenoic Acid: Are They Different? Trevor A Mori, Ph.D., Professor, School of Medicine and Pharmacology, Royal Perth Hospital Unit, University of Western Australia, Perth,
More informationIntroduction. Acute sodium overload produces renal tubulointerstitial inflammation in normal rats
Acute sodium overload produces renal tubulointerstitial inflammation in normal rats MI Roson, et al. Kidney International (2006) Introduction Present by Kanya Bunnan and Wiraporn paebua Tubular sodium
More informationSupplementary Materials. for Garmy-Susini, et al, Integrin 4 1 signaling is required for lymphangiogenesis and tumor metastasis
Supplementary Materials for Garmy-Susini, et al, Integrin 4 1 signaling is required for lymphangiogenesis and tumor metastasis 1 Supplementary Figure Legends Supplementary Figure 1: Integrin expression
More informationPersonalized Medicine: An
Comparative Effectiveness and Personalized Medicine: An Essential interface Clinical exemplers of personalized medicine i Clyde Yancy, MD, FACC, FAHA, MACP Medical Director, Baylor Heart and Vascular Institute
More informationTHROMBOSIS. Dr. Nisreen Abu Shahin Assistant Professor of Pathology Pathology Department University of Jordan
THROMBOSIS Dr. Nisreen Abu Shahin Assistant Professor of Pathology Pathology Department University of Jordan NORMAL BLOOD VESSEL HISTOLOGY THROMBOSIS Pathogenesis (called Virchow's triad): 1. Endothelial*
More information(A) PCR primers (arrows) designed to distinguish wild type (P1+P2), targeted (P1+P2) and excised (P1+P3)14-
1 Supplemental Figure Legends Figure S1. Mammary tumors of ErbB2 KI mice with 14-3-3σ ablation have elevated ErbB2 transcript levels and cell proliferation (A) PCR primers (arrows) designed to distinguish
More informationWho Cares About the Past?
Risk Factors, the New Calcium Score, Rheology and Atherosclerosis Progression Arthur Agatston 2/21/15 The Vulnerable Plaque vs. Plaque Burden CT Angiogram Is There a Role for Coronary Artery Calcium Scoring
More informationAging is a well-documented cardiovascular risk factor.
Physical Activity Prevents Age-Related Impairment in Nitric Oxide Availability in Elderly Athletes Stefano Taddei, MD; Fabio Galetta, MD; Agostino Virdis, MD; Lorenzo Ghiadoni, MD; Guido Salvetti, MD;
More informationBlood Vessels. Types of Blood Vessels Arteries carry blood away from the heart Capillaries smallest blood vessels. Veins carry blood toward the heart
C H A P T E R Blood Vessels 20 Types of Blood Vessels Arteries carry blood away from the heart Capillaries smallest blood vessels The site of exchange of molecules between blood and tissue fluid Veins
More informationConduit Artery Constriction Mediated by Low Flow
Journal of the American College of Cardiology Vol. 51, No. 20, 2008 2008 by the American College of Cardiology Foundation ISSN 0735-1097/08/$34.00 Published by Elsevier Inc. doi:10.1016/j.jacc.2008.01.049
More informationLandmesser U et al. Eur Heart J 2017; https://doi.org/ /eurheartj/ehx549
2017 Update of ESC/EAS Task Force on Practical Clinical Guidance for PCSK9 inhibition in Patients with Atherosclerotic Cardiovascular Disease or in Familial Hypercholesterolaemia Cardiovascular Outcomes
More informationAtherothrombosis And Coronary Artery Disease
Atherothrombosis And Coronary Artery Disease 1 / 6 2 / 6 3 / 6 Atherothrombosis And Coronary Artery Disease Risk factors for coronary artery disease (CAD) were not formally established until the initial
More informationCopyright 2010 Pearson Education, Inc. Blood Vessel Structure
Blood Vessel Structure Structure of Blood Vessel Walls Arteries and veins Tunica intima, tunica media, and tunica externa Lumen Central blood-containing space Capillaries Endothelium with sparse basal
More informationESC Congress 2011 Wednesday August 31st 2011
ESC Congress 211 Wednesday August 31st 211 stimulates endothelial CAT-1 expression and L-arginine uptake: a novel mechanism leading to endothelial-protective effects of that is profoundly impaired in patients
More informationLDL (Human) ELISA Kit
LDL (Human) ELISA Kit Cat. No.:DEIA3864 Pkg.Size:96T Intended use This immunoassay kit allows for the specific measurement of human low density lipoprotein, LDL concentrations in cell culture supernates,
More informationTargeting intracellular arginine / asymmetric dimethylarginine (ADMA).
Targeting intracellular arginine / asymmetric dimethylarginine (ADMA). From bench to practice: Novel anti-atherogenic strategies to improve endothelial function Rainer H. Böger, M.D. Institute of Clinical
More informationCholesterol and Cholesterol Oxides on Coronary Heart Diseases
Cholesterol and Cholesterol Oxides on Coronary Heart Diseases Trends in egg consumption in U.S. and the reason A. Egg Consumption: - 403 in 1945-234 in 1993 (176 Table eggs, 58 Processed eggs) - 256 in
More informationArteriosclerosis & Atherosclerosis
Arteriosclerosis & Atherosclerosis Arteriosclerosis = hardening of arteries = arterial wall thickening + loss of elasticity 3 types: -Arteriolosclerosis -Monckeberg medial sclerosis -Atherosclerosis Arteriosclerosis,
More informationAn x-ray microscopic study of the vasa vasorum
Thorax (1964), 19, 561. An x-ray microscopic study of the vasa vasorum of normal human pulmonary arteries JOHN A. CLARKE From the Department of Anatomy, University of Glasgow The first description of the
More informationClinical Investigation and Reports
Clinical Investigation and Reports Prognostic Impact of Coronary Vasodilator Dysfunction on Adverse Long-Term Outcome of Coronary Heart Disease Volker Schächinger, MD; Martina B. Britten, MD; Andreas M.
More informationIKKα Causes Chromatin Modification on Pro-Inflammatory Genes by Cigarette Smoke in Mouse Lung
IKKα Causes Chromatin Modification on Pro-Inflammatory Genes by Cigarette Smoke in Mouse Lung Se-Ran Yang, Samantha Valvo, Hongwei Yao, Aruna Kode, Saravanan Rajendrasozhan, Indika Edirisinghe, Samuel
More informationConflict of Interest Slide
Comparison of six- month clinical outcomes, event free survival rates of patients undergoing enhanced external counterpulsation (EECP) for coronary artery disease in the United States and Europe Ozlem
More informationCho et al., 2009 Journal of Cardiology (2009), 54:
Endothelial Dysfunction, Increased Carotid Artery Intima-media Thickness and Pulse Wave Velocity, and Increased Level of Inflammatory Markers are Associated with Variant Angina Cho et al., 2009 Journal
More informationInactivity of nitric oxide synthase gene in the atherosclerotic human carotid artery
Basic Res Cardiol 102:308 317 (2007) DOI 10.1007/s00395-007-0650-7 ORIGINAL CONTRIBUTION Felix C. Tanner Bernd van der Loo Sidney Shaw Helen Greutert Markus M. Bachschmid Maria Berrozpe Izabela Rozenberg
More informationRole of Endothelial Nitric Oxide in Shear Stress Induced Vasodilation of Human Microvasculature
Role of Endothelial Nitric Oxide in Shear Stress Induced Vasodilation of Human Microvasculature Diminished Activity in Hypertensive and Hypercholesterolemic Patients Oscar A. Paniagua, MD; Melissa B. Bryant,
More informationObserve the effects of atherosclerosis on the coronary artery lumen
Clumps and Bumps: A Look at Atherosclerosis Activity 4B Activity Description This activity features actual photomicrographs of coronary artery disease in young people aged 18 24 years. Students will observe
More information1Why lipids cannot be transported in blood alone? 2How we transport Fatty acids and steroid hormones?
1Why lipids cannot be transported in blood alone? 2How we transport Fatty acids and steroid hormones? 3How are dietary lipids transported? 4How lipids synthesized in the liver are transported? 5 Lipoprotien
More informationAcute Vascular Effects of Estrogen
786 Acute Vascular Effects of Estrogen in Postmenopausal Women David M. Gilligan, MD; Diane M. Badar, RN; Julio A. Panza, MD; Arshed A. Quyyumi, MD; Richard. Cannon III, MD Downloaded from http://ahajournals.org
More informationThe Cardiovascular System. The Structure of Blood Vessels. The Structure of Blood Vessels. The Blood Vessels. Blood Vessel Review
The Cardiovascular System The Blood Vessels The Structure of Blood Vessels Blood Vessel Review Arteries carry blood away from the heart Pulmonary trunk to lungs Aorta to everything else Microcirculation
More informationCell-Derived Inflammatory Mediators
Cell-Derived Inflammatory Mediators Introduction about chemical mediators in inflammation Mediators may be Cellular mediators cell-produced or cell-secreted derived from circulating inactive precursors,
More informationNeutrophils contribute to fracture healing by synthesizing fibronectin+ extracellular matrix rapidly after injury
Neutrophils contribute to fracture healing by synthesizing fibronectin+ extracellular matrix rapidly after injury Bastian OW, Koenderman L, Alblas J, Leenen LPH, Blokhuis TJ. Neutrophils contribute to
More informationUNDERSTANDING ATHEROSCLEROSIS
UNDERSTANDING ATHEROSCLEROSIS UNDERSTANDING ATHEROSCLEROSIS ARTERIES Arteries are blood vessels that carry oxygenated blood to all the organs of the body. Arteries are made up of three important layers:
More informationThe aorta is an integral part of the cardiovascular system and should not be considered as just a conduit for blood supply from the heart to the
The aorta is an integral part of the cardiovascular system and should not be considered as just a conduit for blood supply from the heart to the limbs and major organs. A range of important pathologies
More informationThe coronary vascular endothelium modulates vascular
Long-term L-Arginine Supplementation Improves Small-Vessel Coronary Endothelial Function in Humans Amir Lerman, MD; John C. Burnett, Jr, MD; Stuart T. Higano, MD; Linda J. McKinley, RN; David R. Holmes,
More informationRole of Circulating Endothelin-1 and Tissue Immunoreactivity in Coronary Artery Disease. Gurmukh Sainani, Vibhuti Maru, Arun Mehra INTRODUCTION
Role of Circulating Endothelin-1 and Tissue Immunoreactivity in Coronary Artery Disease Gurmukh Sainani, Vibhuti Maru, Arun Mehra INTRODUCTION Endothelial cell dysfunction is the early and key factor in
More informationEffects of High Cholesterol Diet and Parallel Exercise Training on the Vascular. Function of Rabbit Aortas: A Time Course Study
Articles in PresS. J Appl Physiol (May 16, 2003). 10.1152/japplphysiol.00282.2003 Effects of High Cholesterol Diet and Parallel Exercise Training on the Vascular Function of Rabbit Aortas: A Time Course
More informationPathophysiology of Lipid Disorders
Pathophysiology of Lipid Disorders Henry Ginsberg, M.D. Division of Preventive Medicine and Nutrition CHD in the United States CHD is the single largest killer of men and women 12 million have history
More informationSupplemental Figure I
Supplemental Figure I Kl ( mmol/l)-induced Force orta M (mn) 1 (mn) 1 Supplemental Figure I. Kl-induced contractions. and, Kl ( mmol/l)-induced contractions of the aorta () and those of mesenteric arteries
More informationJournal of the American College of Cardiology Vol. 36, No. 5, by the American College of Cardiology ISSN /00/$20.
Journal of the American College of Cardiology Vol. 36, No. 5, 2000 2000 by the American College of Cardiology ISSN 0735-1097/00/$20.00 Published by Elsevier Science Inc. PII S0735-1097(00)00924-4 EXPERIMENTAL
More informationExtra notes for lab- 1 histology. Slide 1 : cross section in the elastic artery ( aortic arch, ascending aorta, descending aorta )
Extra notes for lab- 1 histology Slide 1 : cross section in the elastic artery ( aortic arch, ascending aorta, descending aorta ) - twin of ascending aorta is the pulmonary trunk. Ascending aorta represents
More informationOral Disease as a Risk Factor for Acute Coronary Syndrome Single Center Experience
1167 International Journal of Collaborative Research on Internal Medicine & Public Health Oral Disease as a Risk Factor for Acute Coronary Syndrome Single Center Experience Sachin Kumar Amruthlal Jain
More informationRheological, mechanical and failure properties of biological soft tissues at high strains and rates of deformation
Rheological, mechanical and failure properties of biological soft tissues at high strains and rates of deformation Society of Rheology Conference Salt Lake City, Utah October 10, 2007 Martin L. Sentmanat,
More informationFor unclear reasons, only about 40% of patients with calcific aortic stenosis also have coronary
Αθηροσκλήρωση και ασβεστοποιός στένωση της αορτικής βαλβίδας. Οµοιότητες και διαφορές Ν. Μεζίλης Κλινική «Άγιος Λουκάς» Ασβεστοποιός στένωση της αορτικής βαλβίδας: Μία ακόµα µορφή αθηρωµάτωσης; Some observations
More informationVasoRx: Atherosclerotic Plaque Regression
VasoRx: Atherosclerotic Plaque Regression A progressive disease characterized by plaque build-up in large arteries, leading to heart attacks, stroke, and peripheral vascular disease. Induced by a combination
More informationPCI in Patients with Transplant Coronary Artery Disease. Michael S. Lee, MD, FACC, FSCAI Assistant Professor UCLA School of Medicine
PCI in Patients with Transplant Coronary Artery Disease Michael S. Lee, MD, FACC, FSCAI Assistant Professor UCLA School of Medicine Faculty Disclosure Honararia for Boston Scientific, BMS, Daiichi Sankyo,
More informationInflammation plays a major role in atherosclerosis, 1 and
Soluble P-Selectin and the Risk of Future Cardiovascular Events Paul M. Ridker, MD; Julie E. Buring, ScD; Nader Rifai, PhD Background P-selectin, a cell-surface adhesion molecule involved in leukocyte
More informationImpaired vasodilation of peripheral response to acetylcholine in human with abdominal aortic aneurysm
Impaired vasodilation of peripheral response to acetylcholine in human with abdominal aortic aneurysm arteries beings in Kimihiro Komori, MD, PhD, Kyoutaro Mawatari, MD, Hiroyuki Itoh, MD, and Keizo Sugimachi,
More informationLab Activity 25. Blood Vessels & Circulation. Portland Community College BI 232
Lab Activity 25 Blood Vessels & Circulation Portland Community College BI 232 Artery and Vein Histology Walls have 3 layers: Tunica intima Tunica media Tunica externa 2 Tunica Intima Is the innermost layer
More informationOVERVIEW OF CLINICAL TRIALS
Vascular Bi o l o g y in Clinical Pr a c t i c e Vol. 1, No. 2 A CME Monograph Series OVERVIEW OF CLINICAL TRIALS TO IMPROVE ENDOTHELIAL FUNCTION GUEST EDITOR Arshed A. Quyyumi, MD, MRCP National Institutes
More informationMechanical Properties and Active Remodeling of Blood Vessels. Systemic Arterial Tree. Elastic Artery Structure
Mechanical Properties and Active Remodeling of Blood Vessels Gross anatomy of systemic and pulmonary circulation Microscopic structure Mechanical properties and testing Residual stress Remodeling Systemic
More informationINFLAMM-O-WARS ACTIVITY 4B. Clumps and Bumps: A Look at Atherosclerosis. Student Activity Page 4B. Introduction. Background A LOOK AT ATHEROSCLEROSIS
Clumps and Bumps: A Look at Atherosclerosis Student Activity Page 4B Introduction Chances are that every one in your class knows somebody who has had a heart attack, but how many really understand what
More informationCorrelation between expression and significance of δ-catenin, CD31, and VEGF of non-small cell lung cancer
Correlation between expression and significance of δ-catenin, CD31, and VEGF of non-small cell lung cancer X.L. Liu 1, L.D. Liu 2, S.G. Zhang 1, S.D. Dai 3, W.Y. Li 1 and L. Zhang 1 1 Thoracic Surgery,
More informationAcute coronary syndrome. Dr LM Murray Chemical Pathology Block SA
Acute coronary syndrome Dr LM Murray Chemical Pathology Block SA13-2014 Acute myocardial infarction (MI) MI is still the leading cause of death in many countries It is characterized by severe chest pain,
More informationab LDL Uptake Assay Kit (Cell-Based)
ab133127 LDL Uptake Assay Kit (Cell-Based) Instructions for Use For the detection of LDL uptake into cultured cells. This product is for research use only and is not intended for diagnostic use. Version
More informationAdipose Tissue as an Endocrine Organ. Abdel Moniem Ibrahim, MD Professor of Physiology Cairo University
Adipose Tissue as an Endocrine Organ Abdel Moniem Ibrahim, MD Professor of Physiology Cairo University Functions of Adipose Tissue Adipose tissue expresses and secretes a variety of bioactive peptides,
More informationThe New Gold Standard for Lipoprotein Analysis. Advanced Testing for Cardiovascular Risk
The New Gold Standard for Lipoprotein Analysis Advanced Testing for Cardiovascular Risk Evolution of Lipoprotein Testing The Lipid Panel Total Cholesterol = VLDL + LDL + HDL Evolution of Lipoprotein Testing
More informationMechanical Properties and Active Remodeling of Blood Vessels. Blood Vessels
Mechanical Properties and Active Remodeling of Blood Vessels Gross anatomy of systemic and pulmonary circulation Microscopic structure Mechanical properties and testing Residual stress Remodeling Blood
More informationPart 1 Risk Factors and Atherosclerosis. LO1. Define the Different Forms of CVD
Week 3: Cardiovascular Disease Learning Outcomes: 1. Define the difference forms of CVD 2. Describe the various risk factors of CVD 3. Describe atherosclerosis and its stages 4. Describe the role of oxidation,
More informationPrevalence of Coronary Artery Disease: A Tertiary Care Hospital Based Autopsy Study
Article History Received: 03 Feb 2016 Revised: 05 Feb 2016 Accepted: 08 Feb 2016 *Correspondence to: Dr. Alpana Jain Senior demonstrator SMS Medical College, Jaipur, Rajasthan, INDIA. dr.alpana.jain@gmail.com
More informationHistology of the myocardium and blood vessels. Prof. Abdulameer Al-Nuaimi
Histology of the myocardium and blood vessels Prof. Abdulameer Al-Nuaimi E-mail: a.al-nuaimi@sheffield.ac.uk E-mail: abdulameerh@yahoo.com Histology of blood vessels The walls of arteries and veins are
More informationATHEROSCLEROSIS. Secondary changes are found in other coats of the vessel wall.
ATHEROSCLEROSIS Atherosclerosis Atherosclerosis is a disease process affecting the intima of the aorta and large and medium arteries, taking the form of focal thickening or plaques of fibrous tissue and
More informationEXPRESSION OF LIPOPROTEIN LIPASE IN THE RENAL ARTERY AND VEIN OF THE DOMESTIC PIG AN ENZYME-HISTOCHEMICAL STUDY
Bulgarian Journal of Veterinary Medicine (2007), 10, No 3, 155 160 EXPRESSION OF LIPOPROTEIN LIPASE IN THE RENAL ARTERY AND VEIN OF THE DOMESTIC PIG AN ENZYME-HISTOCHEMICAL STUDY Summary A. VODENICHAROV
More informationTHE RELATION BETWEEN LEFT ATRIAL HYPERTENSION
Thorax (1960), 15, 54. THE RELATION BETWEEN LEFT ATRIAL HYPERTENSION AND LYMPHATIC DISTENSION IN LUNG BIOPSIES BY DONALD HEATH AND PETER HICKEN From the Department of Pathology, University of Birmingham
More informationDoes Acute Improvement of Endothelial Dysfunction in Coronary Artery Disease Improve Myocardial Ischemia?
904 JACC Vol. 32, No. 4 MYOCARDIAL ISCHEMIA Does Acute Improvement of Endothelial Dysfunction in Coronary Artery Disease Improve Myocardial Ischemia? A Double-Blind Comparison of Parenteral D- and L-Arginine
More informationSerotonin Receptor Blockade Effective for Postprandial Vasospastic Angina Associated With Dumping Syndrome After Esophagectomy:
1 Serotonin Receptor Blockade Effective for Postprandial Vasospastic Angina Associated With Dumping Syndrome After Esophagectomy: A Case Report Takamasa Takanori Norifumi Mikihisa Masatoshi Masanobu Muneyasu
More informationStable Ischemic Heart Disease. Ivan Anderson, MD RIHVH Cardiology
Stable Ischemic Heart Disease Ivan Anderson, MD RIHVH Cardiology Outline Review of the vascular biology of atherosclerosis Why not just cath everyone with angina? Medical management of ischemic cardiomyopathy
More informationKEY COMPONENTS. Metabolic Risk Cardiovascular Risk Vascular Inflammation Markers
CardioMetabolic Risk Poor blood sugar regulation and unhealthy triglyceride and lipoprotein levels often present long before the diagnosis of type 2 Diabetes. SpectraCell s CardioMetabolic and Pre-Diabetes
More informationSupporting Information
Supporting Information Pang et al. 10.1073/pnas.1322009111 SI Materials and Methods ELISAs. These assays were performed as previously described (1). ELISA plates (MaxiSorp Nunc; Thermo Fisher Scientific)
More informationMitochondrial Implications in Coronary Heart Disease. (Pre-Ischemia)
Mitochondrial Implications in Coronary Heart Disease (Pre-Ischemia) Arteriosclerotic Vascular Disease (ASVD) ASVD is the build up of plaque along arterial walls. Plaque is composed of cholesterol, fat,
More informationAnatomy of the Blood Vessels
Biology 212: Anatomy and Physiology II Anatomy of the Blood Vessels References: Saladin, KS: Anatomy and Physiology, The Unity of Form and Function 8 th (2018). Required reading before beginning this lab:
More informationHypercholesterolemia is associated with abnormal endothelium-dependent
In Vivo Gene Transfer of Endothelial Nitric Oxide Synthase to Carotid Arteries From Hypercholesterolemic Rabbits Enhances Endothelium-Dependent Relaxations Jun ichi Sato, MD, PhD; Tibor Mohácsi, MD; Audra
More informationMorphometric Study of the Right Gastroepiploic and Inferior Epigastric Arteries
Morphometric Study of the Right Gastroepiploic and Inferior Epigastric Arteries Jacques A. M. van Son, MD, PhD, Frank M. Smedts, MD, PhD, Cheng-Qin Yang, MD, Marcel Mravunac, MD, Volkmar Falk, MD, Friedrich
More informationLipoprotein Particle Profile
Lipoprotein Particle Profile 50% of people at risk for HEART DISEASE are not identified by routine testing. Why is LPP Testing The Most Comprehensive Risk Assessment? u Provides much more accurate cardiovascular
More information