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Integrative Physiology |
From the Vascular Biology Unit (H.D.W., S.X., D.G.J., Y.D., A.J.C., R.A.C.), Whitaker Cardiovascular Institute, Department of Medicine, Boston University Medical Center, Boston, Mass, and Department of Veterinary Biology (M.T.Q.), Montana State University, Bozeman, Mont.
Correspondence to Richard A. Cohen, MD, Vascular Biology Unit, X708, Boston University School of Medicine, 650 Albany St, Boston, MA 02118. E-mail racohen{at}medicine.bu.edu
AbstractOxygen-derived free radicals are involved in the vascular response to angiotensin II (Ang II), but the role of NADPH oxidase, its subunit proteins, and their vascular localization remain controversial. Our purpose was to address the role of NADPH oxidase in the blood pressure (BP), aortic hypertrophic, and oxidant responses to Ang II by taking advantage of knockout (KO) mice that are genetically deficient in gp91phox, an NADPH oxidase subunit protein. The baseline BP was significantly lower in KO mice than in wild-type (WT) (92±2 [KO] versus 101±1 [WT] mm Hg, P<0.01), but infusion of Ang II for 6 days caused similar increases in BP in the 2 strains (33±4 [KO] versus 38±2 [WT] mm Hg, P>0.4). Ang II increased aortic superoxide anion production 2-fold in the aorta of WT mice but did not do so in KO mice. Aortic medial area increased in WT (0.12±0.02 to 0.17±0.02 mm2, P<0.05), but did not do so in KO mice (0.10±0.01 to 0.11±0.01 mm2, P>0.05). Histochemistry and polymerase chain reaction demonstrated gp91phox localized in endothelium and adventitia of WT mice. Levels of reactive oxidant species as indicated by 3-nitrotyrosine immunoreactivity increased in these regions in WT but not in KO mouse aorta in response to Ang II. These results indicate an essential role in vivo of gp91phox and NADPH oxidasederived superoxide anion in the regulation of basal BP and a pressure-independent vascular hypertrophic and oxidant stress response to Ang II.
Key Words: angiotensin II superoxide anion 3-nitrotyrosine gp91phox NADPH oxidase
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N. Kalinina, A. Agrotis, E. Tararak, Y. Antropova, P. Kanellakis, O. Ilyinskaya, M. T. Quinn, V. Smirnov, and A. Bobik Cytochrome b558-Dependent NAD(P)H Oxidase-Phox Units in Smooth Muscle and Macrophages of Atherosclerotic Lesions Arterioscler. Thromb. Vasc. Biol., December 1, 2002; 22(12): 2037 - 2043. [Abstract] [Full Text] [PDF] |
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D. M. Tham, B. Martin-McNulty, Y.-X. Wang, V. Da Cunha, D. W. Wilson, C. N. Athanassious, A. F. Powers, M. E. Sullivan, and J. C. Rutledge Angiotensin II injures the arterial wall causing increased aortic stiffening in apolipoprotein E-deficient mice Am J Physiol Regulatory Integrative Comp Physiol, December 1, 2002; 283(6): R1442 - R1449. [Abstract] [Full Text] [PDF] |
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F. E. Rey, X.-C. Li, O. A. Carretero, J. L. Garvin, and P. J. Pagano Perivascular Superoxide Anion Contributes to Impairment of Endothelium-Dependent Relaxation: Role of gp91phox Circulation, November 5, 2002; 106(19): 2497 - 2502. [Abstract] [Full Text] [PDF] |
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U. Rueckschloss, M. T. Quinn, J. Holtz, and H. Morawietz Dose-Dependent Regulation of NAD(P)H Oxidase Expression by Angiotensin II in Human Endothelial Cells: Protective Effect of Angiotensin II Type 1 Receptor Blockade in Patients With Coronary Artery Disease Arterioscler. Thromb. Vasc. Biol., November 1, 2002; 22(11): 1845 - 1851. [Abstract] [Full Text] [PDF] |
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S. Delbosc, J.-P. Cristol, B. Descomps, A. Mimran, and B. Jover Simvastatin Prevents Angiotensin II-Induced Cardiac Alteration and Oxidative Stress Hypertension, August 1, 2002; 40(2): 142 - 147. [Abstract] [Full Text] [PDF] |
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C. Vecchione and R. P. Brandes Withdrawal of 3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase Inhibitors Elicits Oxidative Stress and Induces Endothelial Dysfunction in Mice Circ. Res., July 26, 2002; 91(2): 173 - 179. [Abstract] [Full Text] [PDF] |
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R. M. Touyz, X. Chen, F. Tabet, G. Yao, G. He, M. T. Quinn, P. J. Pagano, and E. L. Schiffrin Expression of a Functionally Active gp91phox-Containing Neutrophil-Type NAD(P)H Oxidase in Smooth Muscle Cells From Human Resistance Arteries: Regulation by Angiotensin II Circ. Res., June 14, 2002; 90(11): 1205 - 1213. [Abstract] [Full Text] [PDF] |
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T. Adachi, R. Matsui, S. Xu, M. Kirber, H. L. Lazar, V. S. Sharov, C. Schoneich, and R. A. Cohen Antioxidant Improves Smooth Muscle Sarco/Endoplasmic Reticulum Ca2+-ATPase Function and Lowers Tyrosine Nitration in Hypercholesterolemia and Improves Nitric Oxide-Induced Relaxation Circ. Res., May 31, 2002; 90(10): 1114 - 1121. [Abstract] [Full Text] [PDF] |
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K. A. Gauss, P. L. Mascolo, D. W. Siemsen, L. K. Nelson, P. L. Bunger, P. J. Pagano, and M. T. Quinn Cloning and sequencing of rabbit leukocyte NADPH oxidase genes reveals a unique p67phox homolog J. Leukoc. Biol., February 1, 2002; 71(2): 319 - 328. [Abstract] [Full Text] [PDF] |
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R. Ferrari, G. Guardigli, G. Cicchitelli, M. Valgimigli, E. Merli, O. Soukhomorskaia, and C. Ceconi Angiotensin II overproduction: enemy of the vessel wall Eur. Heart J. Suppl., February 1, 2002; 4(suppl_A): A26 - A30. [Abstract] [PDF] |
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J. K. Bendall, A. C. Cave, C. Heymes, N. Gall, and A. M. Shah Pivotal Role of a gp91phox-Containing NADPH Oxidase in Angiotensin II-Induced Cardiac Hypertrophy in Mice Circulation, January 22, 2002; 105(3): 293 - 296. [Abstract] [Full Text] [PDF] |
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M. Ruiz-Ortega, O. Lorenzo, M. Ruperez, V. Esteban, Y. Suzuki, S. Mezzano, J.J. Plaza, and J. Egido Role of the Renin-Angiotensin System in Vascular Diseases: Expanding the Field Hypertension, December 1, 2001; 38(6): 1382 - 1387. [Abstract] [Full Text] [PDF] |
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A. J. Cayatte, A. Rupin, J. Oliver-Krasinski, K. Maitland, P. Sansilvestri-Morel, M.-F. Boussard, M. Wierzbicki, T. J. Verbeuren, and R. A. Cohen S17834, a New Inhibitor of Cell Adhesion and Atherosclerosis That Targets NADPH Oxidase Arterioscler. Thromb. Vasc. Biol., October 1, 2001; 21(10): 1577 - 1584. [Abstract] [Full Text] [PDF] |
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K. Irani Angiotensin II-Stimulated Vascular Remodeling : The Search for the Culprit Oxidase Circ. Res., May 11, 2001; 88(9): 858 - 860. [Full Text] [PDF] |
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H. D. Wang, D. G. Johns, S. Xu, and R. A. Cohen Role of superoxide anion in regulating pressor and vascular hypertrophic response to angiotensin II Am J Physiol Heart Circ Physiol, May 1, 2002; 282(5): H1697 - H1702. [Abstract] [Full Text] [PDF] |
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D. Sorescu, D. Weiss, B. Lassegue, R. E. Clempus, K. Szocs, G. P. Sorescu, L. Valppu, M. T. Quinn, J. D. Lambeth, J. D. Vega, et al. Superoxide Production and Expression of Nox Family Proteins in Human Atherosclerosis Circulation, March 26, 2002; 105(12): 1429 - 1435. [Abstract] [Full Text] [PDF] |
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