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(Hypertension. 1999;34:943-949.)
© 1999 American Heart Association, Inc.


Scientific Contributions

Role of Angiotensin and Oxidative Stress in Essential Hypertension

J. Carlos Romero; Jane F. Reckelhoff

From the Department of Physiology and Biophysics, Mayo School of Medicine and Division of Hypertension, Mayo Clinic (J.C.R.) Rochester, Minn; and the Department of Physiology and Biophysics and the Center for Excellence in Cardiovascular-Renal Research, University of Mississippi Medical Center (J.F.R.), Jackson, Miss.

Correspondence to J. Carlos Romero, MD, Department of Physiology, Mayo Clinic, Rochester, MN 55905.

Abstract—In this review, we examine the possibility that small increments in angiotensin II are responsible for an increase in blood pressure and maintenance of hypertension through the stimulation of oxidative stress. A low dose of angiotensin II (2 to 10 ng · kg-1 · min-1, which does not elicit an immediate pressor response), when given for 7 to 30 days by continuous intravenous infusion, can increase mean arterial pressure by 30 to 40 mm Hg. This slow pressor response to angiotensin is accompanied by the stimulation of oxidative stress, as measured by a significant increase in levels of 8-iso-prostaglandin F2{alpha} (F2-isoprostane). Superoxide radicals and nitric oxide can combine chemically to form peroxynitrite, which can then oxidize arachidonic acid to form F2-isoprostanes. F2-isoprostanes exert potent vasoconstrictor and antinatriuretic effects. Furthermore, angiotensin II can stimulate endothelin production, which also has been shown to stimulate oxidative stress. In this way, a reduction in the concentration of nitric oxide (which is quenched by superoxide) along with the formation of F2-isoprostanes and endothelin could potentiate the vasoconstrictor effects of angiotensin II. We hypothesize that these mechanisms, which underlie the development of the slow pressor response to angiotensin II, also participate in the production of hypertension when circulating angiotensin II levels appear normal, as occurs in many cases of essential and renovascular hypertension.


Key Words: isoprostane • endothelin • oxidative stress • hypertension, essential • angiotensin II




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A. Nishiyama, S. Kimura, T. Fukui, M. Rahman, H. Yoneyama, H. Kosaka, and Y. Abe
Blood flow-dependent changes in renal interstitial guanosine 3',5'-cyclic monophosphate in rabbits
Am J Physiol Renal Physiol, February 1, 2002; 282(2): F238 - F244.
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