Circulation. 2005;112:2668-2676
Published online before print October 17, 2005, doi: 10.1161/CIRCULATIONAHA.105.538934
Published online before print October 17, 2005, doi: 10.1161/CIRCULATIONAHA.105.538934
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(Circulation. 2005;112:2668-2676.)
© 2005 American Heart Association, Inc.
Hypertension |
Nox1 Overexpression Potentiates Angiotensin II-Induced Hypertension and Vascular Smooth Muscle Hypertrophy in Transgenic Mice
From the Division of Cardiology (A.D., R.C., B.L., S.D., A.S.M., A.L., D.S.W., D.W., W.R.T., K.K.G.) and Department of Pathology (G.C., J.M., J.D.L.), Emory University, Atlanta, Ga; Department of Pharmacology, Monash University, Clayton, Victoria, Australia (H.H.H.W.S.); and Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville (G.K.O.).
Correspondence to Kathy K. Griendling, Emory University, Division of Cardiology, 319 WMB, 1639 Pierce Dr, Atlanta, GA 30322. E-mail kgriend{at}emory.edu
Received January 31, 2005; revision received April 26, 2005; accepted May 10, 2005.
Background— Reactive oxygen species (ROS) have been implicated in the development of cardiovascular pathologies. NAD(P)H oxidases (Noxes) are major sources of reactive oxygen species in the vessel wall, but the importance of individual Nox homologues in specific layers of the vascular wall is unclear. Nox1 upregulation has been implicated in cardiovascular pathologies such as hypertension and restenosis.
Methods and Results— To investigate the pathological role of Nox1 upregulation in vascular smooth muscle, transgenic mice overexpressing Nox1 in smooth muscle cells (TgSMCnox1) were created, and the impact of Nox1 upregulation on the medial hypertrophic response during angiotensin II (Ang II)–induced hypertension was studied. These mice have increased expression of Nox1 protein in the vasculature, which is accompanied by increased superoxide production. Infusion of Ang II (0.7 mg/kg per day) into these mice for 2 weeks led to a potentiation of superoxide production compared with similarly treated negative littermate controls. Systolic blood pressure and aortic hypertrophy were also markedly greater in TgSMCnox1 mice than in their littermate controls. To confirm that this potentiation of vascular hypertrophy and hypertension was due to increased ROS formation, additional groups of mice were coinfused with the antioxidant Tempol. Tempol decreased the level of Ang II-induced aortic superoxide production and partially reversed the hypertrophic and hypertensive responses in these animals.
Conclusions— These data indicate that smooth muscle-specific Nox1 overexpression augments the oxidative, pressor, and hypertrophic responses to Ang II, supporting the concept that medial Nox1 participates in the development of cardiovascular pathologies.
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