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BACKGROUND: Increased production of reactive oxygen species (ROS) throughout the vascular wall is a feature of cardiovascular disease states, but therapeutic strategies remain limited by our incomplete understanding of the role and contribution of specific vascular cell ROS to disease pathogenesis. To investigate the specific role of endothelial cell (EC) ROS in the development of structural vascular disease, we generated a mouse model of endothelium-specific Nox2 overexpression and tested the susceptibility to aortic dissection after angiotensin II (Ang II) infusion. METHODS AND RESULTS: A specific increase in endothelial ROS production in Nox2 transgenic mice was sufficient to cause Ang II-mediated aortic dissection, which was never observed in wild-type mice. Nox2 transgenic aortas had increased endothelial ROS production, endothelial vascular cell adhesion molecule-1 expression, matrix metalloproteinase activity, and CD45(+) inflammatory cell infiltration. Conditioned media from Nox2 transgenic ECs induced greater Erk1/2 phosphorylation in vascular smooth muscle cells compared with wild-type controls through secreted cyclophilin A (CypA). Nox2 transgenic ECs (but not vascular smooth muscle cells) and aortas had greater secretion of CypA both at baseline and in response to Ang II stimulation. Knockdown of CypA in ECs abolished the increase in vascular smooth muscle cell Erk1/2 phosphorylation conferred by EC conditioned media, and preincubation with CypA augmented Ang II-induced vascular smooth muscle cell ROS production. CONCLUSIONS: These findings demonstrate a pivotal role for EC-derived ROS in the determination of the susceptibility of the aortic wall to Ang II-mediated aortic dissection. ROS-dependent CypA secretion by ECs is an important signaling mechanism through which EC ROS regulate susceptibility of structural components of the aortic wall to aortic dissection.

Original publication

DOI

10.1161/CIRCULATIONAHA.113.005062

Type

Journal article

Journal

Circulation

Publication Date

24/06/2014

Volume

129

Pages

2661 - 2672

Keywords

NADPH oxidase, angiotensin II, aorta, cyclophilin A, dissection, reactive oxygen species, Aneurysm, Dissecting, Angiotensin II, Animals, Aortic Aneurysm, Cyclophilins, Disease Models, Animal, Disease Susceptibility, Endothelium, Vascular, Male, Matrix Metalloproteinases, Membrane Glycoproteins, Mice, Mice, Inbred C57BL, Mice, Transgenic, Muscle, Smooth, Vascular, NADPH Oxidase 2, NADPH Oxidases, Reactive Oxygen Species, Signal Transduction, Vascular Cell Adhesion Molecule-1