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AJP - Heart and Circulatory Physiology, Vol 271, Issue 4 1626-H1634, Copyright © 1996 by American Physiological Society
ARTICLES |
S. A. Jones, V. B. O'Donnell, J. D. Wood, J. P. Broughton, E. J. Hughes and O. T. Jones
Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.
Low-level generation of reactive oxygen species (ROS) by endothelial cells in response to a variety of stimuli has been observed; however, the enzyme system responsible is unknown. Using a variety of techniques, we examined for components of the phagocyte superoxide-generating NADPH oxidase to elucidate whether this enzyme could be a source of endothelial-derived ROS. Superoxide generation on addition of 100 microM NAD(P)H to human umbilical vein endothelial cell (HUVEC) sonicates (using lucigenin-enhanced chemiluminescence) was partially inhibited on addition of the flavoenzyme inhibitor diphenyliodonium (IDP). Reverse transcriptase-polymerase chain reaction (RT-PCR) demonstrated expression of gp91phox, p22phox, p67phox, and p47phox in four independent HUVEC isolates. Expression of p22phox was also confirmed by Northern blotting. RT-PCR for tumor necrosis factor-alpha was negative, indicating an absence of mononuclear cell contamination (a potential source of NADPH oxidase). Immunoperoxidase staining, using anti-p47phox (JW-1)- and anti-p67phox (JW-2)-specific antibodies, showed protein expression of these cytosolic components. However, heme spectroscopy failed to indicate the presence of the low-potential cytochrome b558. These data indicate that cultured human endothelial cells express both mRNA and protein for cytosolic components of the phagocyte superoxide-generating NADPH oxidase. However, because the cytochrome b558 heme could not be conclusively demonstrated, a contribution of the phagocyte NADPH oxidase to endothelial oxidant generation may be unlikely.
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