Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:1903-1911
© 2000 American Heart Association, Inc.
Vascular Biology |
Molecular Characterization and Localization of the NAD(P)H Oxidase Components gp91-phox and p22-phox in Endothelial Cells
From the Departments of Cardiology, GKT School of Medicine (U.B., A.M.S.), King’s College, London, and the University of Wales College of Medicine (L.B.), Cardiff, UK.
Correspondence to Professor Ajay M. Shah, Department of Cardiology, GKT School of Medicine, King’s College London, Bessemer Road, London SE5 9PJ, UK. E-mail ajay.shah{at}kcl.ac.uk
Abstract—The production of reactive oxygen species (ROS) within endothelial cells may have several effects, including alterations in the activity of paracrine factors, gene expression, apoptosis, and cellular injury. Recent studies indicate that a phagocyte-type NAD(P)H oxidase is a major source of endothelial ROS. In contrast to the high-output phagocytic oxidase, the endothelial enzyme has much lower biochemical activity and a different substrate specificity (NADH>NADPH). In the present study, we (1) cloned and characterized the cDNA and predicted amino acid structures of the 2 major subunits of rat coronary microvascular endothelial cell NAD(P)H oxidase, gp91-phox and p22-phox; (2) undertook a detailed comparison with phagocytic NADPH oxidase sequences; and (3) studied the subcellular location of these subunits in endothelial cells. Although these studies revealed an overall high degree of homology (>90%) between the endothelial and phagocytic oxidase subunits, the endothelial gp91-phox sequence has potentially important differences in a putative NADPH-binding domain and in putative glycosylation sites. In addition, the subcellular location of the endothelial gp91-phox and p22-phox subunits is significantly different from that reported for the neutrophil oxidase, in that they are predominantly intracellular and collocated in the vicinity of the endoplasmic reticulum. This first detailed characterization of gp91-phox and p22-phox structure and location in endothelial cells provides new data that may account, in part, for the differences in function between the phagocytic and endothelial NAD(P)H oxidases.
Key Words: endothelium • NADPH oxidase • reactive oxygen species • cDNA
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