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Circulation. 2003
Published online before print June 16, 2003, doi: 10.1161/01.CIR.0000074229.93804.5C
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Submitted on January 10, 2003
Revised on April 3, 2003
Accepted on April 4, 2003

Regular Physical Activity Improves Endothelial Function in Patients With Coronary Artery Disease by Increasing Phosphorylation of Endothelial Nitric Oxide Synthase

R. Hambrecht MD*, V. Adams PhD, S. Erbs MD, A. Linke MD, N. Kränkel BS, Y. Shu BS, Y. Baither BS, S. Gielen MD, H. Thiele MD, J. F. Gummert MD, F. W. Mohr MD, and G. Schuler MD

From the Heart Center, Department of Cardiology (R.H., V.A., S.E., A.L., N.K., Y.S., Y.B., S.G., H.T., G.S.), and Department of Cardiac Surgery (J.F.G., F.W.M.), University of Leipzig, Germany.

* To whom correspondence should be addressed. E-mail: hamr{at}medizin.uni-leipzig.de.

Background--In stable coronary artery disease (CAD), exercise training has well-documented positive effects on arterial endothelial function. NO derived from endothelial NO synthase (eNOS) is regarded as a protective factor against atherosclerosis. The aim of the present study was to investigate the effects of exercise training on the endothelial function in relation to the expression of eNOS and Akt-dependent eNOS phosphorylation in the left internal mammary artery (LIMA) of patients with stable CAD.

Methods and Results--In 17 training patients (T) and 18 control patients (C), endothelium-dependent vasodilation and average peak flow velocity (APV) in response to acetylcholine were measured invasively at study beginning and after 4 weeks in the LIMA. In LIMA tissue sampled during bypass surgery, eNOS expression and content of pospho-eNOS-Ser1177, Akt, and phospho-Akt were determined by Western blot and quantitative reverse transcriptase-polymerase chain reaction. After exercise training, LIMA APV in response to acetylcholine was increased by 56±8% (from +48±8% at beginning to +104±11% after 4 weeks, P<0.001). Patients in T had a 2-fold higher eNOS protein expression (T 1.0±0.7 versus C 0.5±0.3 arbitrary units, P<0.05) and 4-fold higher eNOS Ser1177-phosphorylation levels in LIMA-endothelium (1.2±0.9 versus 0.3±0.2 arbitrary units, P<0.01). A linear correlation was confirmed between Akt phosphorylation and phospho-eNOS levels (R=0.80, P<0.05) and between phospho-eNOS and {Delta} APV (R=0.59, P<0.05).

Conclusions--Exercise training in stable CAD leads to an improved agonist-mediated endothelium-dependent vasodilatory capacity. The change in acetylcholine-induced vasodilatation was closely related to a shear stress-induced/Akt-dependent phosphorylation of eNOS on Ser1177.


Key words: coronary disease • endothelium • exercise • nitric oxide synthase


Related Article:

Exercise and Cardiovascular Health: Get Active to "AKTivate" Your Endothelial Nitric Oxide Synthase
Stefanie Dimmeler and Andreas M. Zeiher
Circulation 2003 107: 3118-3120. [Extract] [Full Text]



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Circulation, April 27, 2004; 109(16): 1911 - 1913.
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R. Hambrecht, C. Walther, S. Mobius-Winkler, S. Gielen, A. Linke, K. Conradi, S. Erbs, R. Kluge, K. Kendziorra, O. Sabri, et al.
Percutaneous Coronary Angioplasty Compared With Exercise Training in Patients With Stable Coronary Artery Disease: A Randomized Trial
Circulation, March 23, 2004; 109(11): 1371 - 1378.
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J. A. Vita and G. F. Mitchell
Effects of shear stress and flow pulsatility on endothelial function: Insights gleaned from external counterpulsation therapy
J. Am. Coll. Cardiol., December 17, 2003; 42(12): 2096 - 2098.
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S. Dimmeler and A. M. Zeiher
Exercise and Cardiovascular Health: Get Active to "AKTivate" Your Endothelial Nitric Oxide Synthase
Circulation, July 1, 2003; 107(25): 3118 - 3120.
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