© 2001 American Heart Association, Inc.
Cellular Biology |
NAD(P)H Oxidase–Derived Superoxide Mediates Hypercholesterolemia-Induced Leukocyte–Endothelial Cell Adhesion
From the Department of Molecular and Cellular Physiology (K.Y.S., E.C.C., J.M.R., D.N.G.), Louisiana State University Health Sciences Center, Shreveport, La, and Department of Anatomy and Physiology (C.R.R.), College of Veterinary Medicine, Kansas State University, Manhattan, Kan.
Correspondence to D. Neil Granger, PhD, Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, 1501 E Kings Hwy, Shreveport, LA 71130-3932. E-mail dgrang{at}lsumc.edu
Abstract—Experimental animals placed on a high-cholesterol diet for 2 or more weeks exhibit an inflammatory response in postcapillary venules. The aims of this study were to determine (1) whether superoxide mediates the hypercholesterolemia-induced inflammatory response and (2) whether leukocyte and/or vessel wall NAD(P)H oxidase contributes to this response. Intravital videomicroscopy was used to quantify leukocyte–endothelial cell adhesion in cremasteric postcapillary venules of wild-type (WT) mice, CuZn-superoxide dismutase transgenic (SOD TgN) mice, and mice heterozygous (p47phox+/-) or homozygous (p47phox-/-) for NAD(P)H oxidase placed on either a normal diet or high-cholesterol diet (HCD) for 2 weeks. The number of adherent and emigrated leukocytes in postcapillary venules of WT HCD mice was significantly higher than that detected in venules of their normal-diet counterparts. However, the HCD-induced recruitment of adherent and emigrated leukocytes was not observed in SOD TgN mice. Whereas hypercholesterolemic p47phox+/- and WT mice exhibited similar inflammatory responses, p47phox-/- mice did not. Bone marrow chimeras were developed to selectively delete p47phox from either the vessel wall or circulating leukocytes. Whereas WT marrow transplanted into WT mice produced a normal inflammatory response of venules to HCD, chimeric mice with p47phox deficiency in either the vessel wall or leukocytes exhibited an attenuated inflammatory response to HCD that was comparable with that observed in p47phox-/- HCD mice. Our findings indicate that enhanced superoxide production is a critical event that initiates the leukocyte–endothelial cell adhesion in postcapillary venules of HCD mice. NAD(P)H oxidase appears to be an important source of this superoxide.
Key Words: superoxide dismutase • p47phox • microvasculature • leukocyte emigration • chimeras
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