Molecular imaging of inflammation and platelet adhesion in advanced atherosclerosis effects of antioxidant therapy with NADPH oxidase inhibition

Liu, Y. and Davidson, B. P. and Yue, Q. and Belcik, T. and Xie, A. and Inaba, Y. and McCarty, O. J. and Tormoen, G. W. and Zhao, Y. and Ruggeri, Z. M. and Kaufmann, B. A. and Lindner, J. R.. (2013) Molecular imaging of inflammation and platelet adhesion in advanced atherosclerosis effects of antioxidant therapy with NADPH oxidase inhibition. Circulation: Cardiovascular Imaging, 6 (1). pp. 74-82.

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Official URL: http://edoc.unibas.ch/dok/A6338428

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In atherosclerosis, local generation of reactive oxygen species amplifies the inflammatory response and contributes to plaque vulnerability. We used molecular imaging to test whether inhibition of NADPH oxidase with apocynin would reduce endothelial inflammatory activation and endothelial-platelet interactions, thereby interrupting progression to high-risk plaque phenotype. METHODS AND RESULTS: Mice deficient for both the low-density lipoprotein receptor and Apobec-1 were studied at 30 weeks of age and again after 10 weeks with or without apocynin treatment (10 or 50 mg/kg per day orally). In vivo molecular imaging of vascular cell adhesion molecule-1 (VCAM 1) P-selectin, and platelet glycoprotein-1balpha (GPIbalpha) in the thoracic aorta was performed with targeted contrast-enhanced ultrasound molecular imaging. Arterial elastic modulus and pulse wave transit time were assessed using ultrahigh frequency ultrasound and invasive hemodynamic measurements. Plaque size and composition were assessed by histology. Molecular imaging in nontreated mice detected a 2-fold increase in P-selectin expression, VCAM-1 expression, and platelet adhesion between 30 and 40 weeks of age. Apocynin reduced all of these endothelial events in a dose-dependent fashion (25% and 50% reduction in signal at 40 weeks for low- and high-dose apocynin). Apocynin also decreased aortic elastic modulus and increased the pulse transit time. On histology, apocynin reduced total monocyte accumulation in a dose-dependent manner as well as platelet adhesion, although total plaque area was reduced in only the high-dose apocynin treatment group. CONCLUSIONS: Inhibition of NADPH oxidase in advanced atherosclerosis reduces endothelial activation and platelet adhesion, which are likely responsible for the arrest of plaque growth and improvement of vascular mechanical properties.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Cardiovascular Molecular Imaging (Kaufmann)
UniBasel Contributors:Kaufmann, Beat
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Lippincott, Williams & Wilkins
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 Oct 2017 11:32
Deposited On:10 Apr 2015 09:12

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