Circulation Research. 2002;90:904-910
Published online before print March 28, 2002, doi: 10.1161/01.RES.0000016506.04193.96
Published online before print March 28, 2002, doi: 10.1161/01.RES.0000016506.04193.96
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© 2002 American Heart Association, Inc.
Integrative Physiology |
Functional Reconstitution of Endothelial Nitric Oxide Synthase Reveals the Importance of Serine 1179 in Endothelium-Dependent Vasomotion
From the Department of Pharmacology, Vascular Cell Signaling and Therapeutics Program, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, Conn. The present address for R.D.R. is the Center for Experimental Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, Pa.
Correspondence to William C. Sessa, Dept of Pharmacology, Vascular Cell Signaling and Therapeutics Program, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06536. E-mail william.sessa{at}yale.edu
Phosphorylation of endothelial nitric oxide synthase (eNOS) at serine 1179 can activate the enzyme, leading to NO release. Because eNOS is important in regulating vascular tone, we investigated whether phosphorylation of this residue is involved in vasomotion. Adenoviral transduction of endothelial cells (ECs) with the phosphomimetic S1179DeNOS markedly increased basal and vascular endothelial cell growth factor (VEGF)–stimulated NO release compared with cells transduced with wild-type virus. Conversely, adenoviral transduction of ECs with the non-phosphorylatable S1179AeNOS suppressed basal and stimulated NO release. Using a novel method for luminal delivery of adenovirus, transduction of the endothelium of carotid arteries from eNOS knockout mice with S1179DeNOS completely restored NO-mediated dilatation to acetylcholine (ACh), whereas vasomotor responses in arteries transduced with S1179AeNOS were significantly attenuated. Basal NO release was also significantly reduced in arteries transduced with S1179AeNOS, compared with S1179DeNOS. Thus, our data directly demonstrate that phosphorylation of eNOS at serine 1179 is an important regulator of basal and stimulated NO release in ECs and in intact blood vessels.
Key Words: adenovirus • endothelium • vascular endothelial growth factor • signal transduction • nitric oxide
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