Zusammenfassung
L-Arginin ist das Substrat für das Enzym Stickstoffmonoxidsynthase (NOS), welches
für die Produktion von Stickstoffmonoxid (NO) verantwortlich ist. Stickstoffmonoxid
ist ein endogenes Molekül, das eine zentrale Rolle in der Regulation von Gefäßtonus
und Gefäßstruktur spielt und an vielen Prozessen beteiligt ist, die während der Entwicklung
der Atherosklerose ablaufen. Es ist gezeigt worden, dass sowohl die akute als auch
die chronische Gabe von L-Arginin die Endothelfunktion in Tiermodellen mit Hypercholesterinämie
und Atherosklerose verbessern kann. Studien haben gezeigt, dass die diätetische Gabe
von L-Arginin die NO-Bildung beim Menschen steigern kann und dadurch letztlich die
Gefäßgesundheit verbessert werden kann. In dem vorliegenden Artikel wird eine Übersicht
über die Studienergebnisse mit intravenöser und oraler Gabe von L-Arginin beim Menschen
gegeben, die ein breites Spektrum von Dosierungen, Studiendauer und Surrogatparametern
für die Endothelfunktion widerspiegeln. Die Pharmakokinetik von L-Arginin wurde untersucht,
Nebenwirkungen sind selten, meistens ungefährlich und dosisabhängig. Verschiedene
mögliche Wirkungsmechanismen von L-Arginin werden vorgestellt. Abschließend wird eine
Bewertung von L-Arginin als Therapeutikum aus der Sicht der Klinischen Pharmakologie
gegeben.
Summary
L-arginine is the substrate for the enzyme nitric oxide synthase (NOS), which is responsible
for the production of nitric oxide (NO), an endogenous messenger molecule involved
in many of the processes associated with the development of atherosclerosis. Acute
and chronic administration of L-arginine has been shown to improve endothelial function
in animal models of hypercholesterolemia and atherosclerosis. Therefore, a lot of
studies were conducted to elucidate whether dietary L-arginine supplementation can
augment NO production in man and thereby improve vascular health. In this review the
results of studies of intravenous and oral L-arginine supplementation with a colorful
spectrum of doses, study duration and surrogate parameters of endothelial function
are summarized. The pharmacokinetics of L-arginine have been investigated, side effects
are rare and mostly mild and dose-dependent. Several possible mechanisms of action
of L-arginine are discussed. An assessment of L-arginine as a therapeutic agent from
the point of view of a clinical pharmacologist is given.
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Professor Dr. med. Stefanie M. Bode-Böger
Direktorin des Instituts für Klinische Pharmakologie, Universitätsklinikum, Otto-von-Guericke-Universität
Leipziger Straße 44
39120 Magdeburg
Phone: 49/391/6713060
Fax: 49/391/6713062
Email: stefanie.bode-boeger@medizin.uni-magdeburg.de