© 1998 American Heart Association, Inc.
Original Contributions |
Endothelial NADPH Oxidase as the Source of Oxidants in Lungs Exposed to Ischemia or High K+
From the Institute for Environmental Medicine (A.B.A.-M., G.Z., C.D., K.T., K.C., V.M., A.B.F.), University of Pennsylvania Medical Center, Philadelphia, Pa; the Department of Anatomy and Physiology (C.R., F.B.), Kansas State University College of Veterinary Medicine, Manhattan, Kan; and the Department of Pediatrics (M.D.), Indiana University School of Medicine, Indianapolis, Ind.
Correspondence to Aron B. Fisher, MD, Institute for Environmental Medicine, University of Pennsylvania School of Medicine, 1 John Morgan Building, 3620 Hamilton Walk, Philadelphia, PA 19104-6068. E-mail abf{at}mail.med.upenn.edu
Abstract—We have previously demonstrated the generation of reactive oxygen species (ROS) in cultured bovine pulmonary artery endothelial cells (BPAECs) and in isolated perfused rat lungs exposed to high K+ and during global lung ischemia. The present study evaluates the NADPH oxidase pathway as a source of ROS in these models. ROS production, detected by oxidation of the fluorophore, dichlorodihydrofluorescein, increased 2.5-fold in BPAECs and 6-fold in rat or mouse lungs exposed to high (24 mmol/L) K+. ROS generation was markedly inhibited by diphenyliodonium, a flavoprotein inhibitor, and by the synthetic peptide PR-39, an inhibitor of NADPH oxidase assembly, whereas allopurinol had no effect. With ischemia (1 hour), ROS generation by rat and mouse lungs increased 7-fold; PR-39 showed concentration-dependent inhibition of ROS production, with 50% inhibition at 3 µmol/L PR-39. ROS production in lungs exposed to high K+ or ischemia was essentially abolished in mice with a "knockout" of gp91phox, a membrane-localized cytochrome component of NADPH oxidase; increased ROS production by these lungs after anoxia/reoxygenation was similar to control. PR-39 also inhibited ischemia and the high K+–mediated increase in lung thiobarbituric acid reactive substance. Western blotting of BPAECs and immunocytochemistry of BPAECs and rat and mouse lungs showed the presence of p47phox, a cytoplasmic component of NADPH oxidase and the putative target for PR-39 inhibition. In situ fluorescence imaging in the intact lung demonstrated that the increased dichlorofluorescein fluorescence in these models of ROS generation was localized primarily to the pulmonary endothelium. These studies demonstrate that ROS production in lungs exposed to ischemia or high K+ results from assembly and activation of a membrane-associated NAPDH oxidase of the pulmonary endothelium.
Key Words: p47phox • gp91phox • bovine pulmonary artery endothelial cell • diphenyliodonium • PR-39
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