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(Circulation. 1999;99:2979-2982.)
© 1999 American Heart Association, Inc.

Brief Rapid Communication

Nitric Oxide Synthase Gene Therapy Rapidly Reduces Adhesion Molecule Expression and Inflammatory Cell Infiltration in Carotid Arteries of Cholesterol-Fed Rabbits

HuSheng Qian, MD, PhD; Valentina Neplioueva, MD, PhD; Geetha A. Shetty, MS; Keith M. Channon, MD, MRCP; Samuel E. George, MD

From the Cardiovascular Division, Duke University Medical Center, Durham, NC.

Correspondence to Samuel E. George, MD, Box 3060, Duke University Medical Center, Durham, NC 27710. E-mail segeorge{at}duke.edu

Background—Hypercholesterolemia reduces nitric oxide bioavailability, manifested by reduced endothelium-dependent vascular relaxation, and also induces vascular adhesion molecule expression and inflammatory cell infiltration. We have previously shown that gene therapy with NO synthase in hypercholesterolemic rabbits substantially reverses the deficit in vascular relaxation. In the present study, we show that NO synthase gene therapy rapidly and substantially reduces vascular adhesion molecule expression, lipid deposition, and inflammatory cell infiltration.

Methods and Results—Thirty male New Zealand White rabbits were maintained on a 1% cholesterol diet for 11 to 13 weeks, then underwent carotid artery gene transfer with Ad.nNOS or Ad.ßGal (recombinant adenoviruses expressing neuronal NO synthase or ß-galactosidase, respectively), or received medium alone in a sham procedure. Arteries were harvested at 1 and 3 days after gene transfer, and the following parameters were determined by immunohistochemical and image-analysis techniques: intercellular adhesion molecule-1, vascular cell adhesion molecule-1, lipid deposition by oil red O staining, lymphocyte infiltration (CD43-positive cells), and monocyte infiltration (RAM-11–positive cells). In Ad.nNOS-treated arteries, all markers were significantly decreased relative to Ad.ßGal or sham-treated arteries within 3 days after gene transfer. Ad.nNOS had a particularly striking impact on monocyte infiltration; as early as 24 hours after gene transfer, Ad.nNOS-treated arteries had >3-fold fewer monocytes than Ad.ßGal- or sham-treated arteries.

Conclusions—NO synthase gene therapy rapidly ameliorates several markers of atherosclerosis in the cholesterol-fed rabbit.

Key Words: nitric oxide • viruses • endothelium • gene therapy • atherosclerosis • cell adhesion molecules

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