© 2002 by European Society of Cardiology
Copyright © 2002, European Society of Cardiology
Vasoprotection by nitric oxide: mechanisms and therapeutic potential
Institut für Pharmakologie und Klinische Pharmakologie, Medizinische Einrichtungen, Heinrich-Heine-Universität, Moorenstrasse 5, 40225 Düsseldorf, Germany
kojda{at}uni-duesseldorf.de
* Corresponding author. Tel.: +49-211-81-12518; fax: +49-211-81-14781
Endothelial production of nitric oxide (nitrogen monoxide, NO) has become a major research area in vascular biology. Some of the most important effects that NO exerts in the vascular wall are potentially vasoprotective, because these effects maintain important physiological functions such as vasodilation, anticoagulation, leucocyte adhesion, smooth muscle proliferation, and the antioxidative capacity. During the last 2 decades it has become apparent that a variety of diseases are associated with an impairment of endothelium-dependent NO activity. One of the major causes is believed to be an increased production of reactive oxygen species, in particular superoxide, which have been shown to interfere with many steps of the NO–cyclic guanosine monophosphate (cGMP) pathway. This phenomenon has been found in diverse conditions such as atherosclerosis, hypertension, diabetes, hypercholesterolemia, heart failure, and cigarette smoking. The aim of this review is to examine the cellular and molecular mechanisms whereby NO exerts potentially vasoprotective effects and to discuss pharmacologic approaches targeting the NO pathway in view of their potential to improve endothelial function and to reduce the progression of atherosclerotic vascular disease. We conclude that there is compelling evidence for vasoprotective actions of NO which are mediated by cGMP-dependent and cGMP-independent mechanisms. These effects may contribute to the beneficial effects of established drugs such as ACE inhibitors or statins. Unfortunately, clinical data on the effect of long-term treatment with nitrates on the progression of coronary artery disease are lacking. Finally, L-arginine or new activators of the NO pathway may become therapeutic options in the future.
KEYWORDS Atherosclerosis; Endothelial function; Nitric oxide; Vasoactive agents
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