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Reactive oxygen species mediate functional differences in human radial and internal thoracic arteries from smokers.

Abstract：

OBJECTIVE:Smoking not only increases the risk that coronary heart disease will develop but also morbidity and mortality in patients with known coronary atherosclerosis and after coronary artery bypass grafting. Excessive generation of reactive oxygen species (ROS) has been implicated as the final common pathway for the development of endothelial dysfunction in various cardiovascular risk factors. This study assessed the influence of smoking on two different human arteries routinely used as coronary artery bypass graft conduits. METHODS:Isometric tension was recorded on discarded segments of human left internal thoracic artery (ITA) and the radial artery (RA) from smokers and nonsmokers. RESULTS:The contractile response to endothelin-1 was significantly stronger in arteries from smokers than in those from nonsmokers. By contrast, endothelium-dependent relaxant responses to acetylcholine were attenuated in RA rings but enhanced in ITA rings from smokers. In additional experiments, 5-(&6)-chloromethyl-2'-7'-dichlorodihydro-fluorescein diacetate (DCDHF) was used to photochemically detect ROS by confocal imaging of intact ITA and RA. Enhanced production of ROS was induced by exposure of tissues to 28 degrees C. While during exposure to 28 degrees C, basal fluorescence emission was unchanged in ITA rings, it increased significantly in RA rings, indicating enhanced formation of ROS in this peripheral artery. CONCLUSIONS:Data suggest that smoking induces endothelial dysfunction by increasing vascular ROS production. Different levels of endogenous antioxidant enzyme activities and the degree of atherosclerotic changes might modulate physiologic and pharmacologic vasoreactivity and be responsible for decreased graft patency of RA compared with ITA conduits, especially in active smokers.

journal_name

J Vasc Surg

journal_title

Journal of vascular surgery

authors

Müller-Schweinitzer E,Müller SE,Reineke DC,Kern T,Carrel TP,Eckstein FS,Grapow MT

doi

10.1016/j.jvs.2009.09.040

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

438-44

issue

2

eissn

0741-5214

issn

1097-6809

pii

S0741-5214(09)01928-4

journal_volume

51

pub_type

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