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Calcium-dependent NOX5 nicotinamide adenine dinucleotide phosphate oxidase contributes to vascular oxidative stress in human coronary artery disease.

Abstract：

OBJECTIVES:This study sought to examine the expression and activity of the calcium-dependent nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (NOX) in human atherosclerotic coronary arteries. BACKGROUND:The NOX-based NADPH oxidases are major sources of reactive oxygen species (ROS) in human vessels. Several NOX homologues have been identified, but their relative contribution to vascular ROS production in coronary artery disease (CAD) is unclear; NOX5 is a unique homolog in that it is calcium dependent and thus could be activated by vasoconstrictor hormones. Its presence has not yet been studied in human vessels. METHODS:Coronary arteries from patients undergoing cardiac transplantation with CAD or without CAD were studied; NOX5 was quantified and visualized using Western blotting, immunofluorescence, and quantitative real-time polymerase chain reaction. Calcium-dependent NADPH oxidase activity, corresponding greatly to NOX5 activity, was measured by electron paramagnetic resonance. RESULTS:Both Western blotting and quantitative real-time polymerase chain reaction indicated a marked increase in NOX5 protein and messenger ribonucleic acid (mRNA) in CAD versus non-CAD vessels. Calcium-dependent NADPH-driven production of ROS in vascular membranes, reflecting NOX5 activity, was increased 7-fold in CAD and correlated significantly with NOX5 mRNA levels among subjects. Immunofluorescence showed that NOX5 was expressed in the endothelium in the early lesions and in vascular smooth muscle cells in the advanced coronary lesions. CONCLUSIONS:These studies identify NOX5 as a novel, calcium-dependent source of ROS in atherosclerosis.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Guzik TJ,Chen W,Gongora MC,Guzik B,Lob HE,Mangalat D,Hoch N,Dikalov S,Rudzinski P,Kapelak B,Sadowski J,Harrison DG

doi

10.1016/j.jacc.2008.07.063

subject

Has Abstract

pub_date

2008-11-25 00:00:00

pages

1803-9

issue

22

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(08)03057-X

journal_volume

52

pub_type

杂志文章

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