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Inhibition of inducible nitric oxide synthase promotes vein graft neoadventitial inflammation and remodeling

Wu, J. and Wadsworth, R.M. and Kennedy, S. (2010) Inhibition of inducible nitric oxide synthase promotes vein graft neoadventitial inflammation and remodeling. Journal of Vascular Research, 48. pp. 141-149. ISSN 1018-1172

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Abstract

Grafting veins into the arterial circulation causes endothelial damage and neointimal hyperplasia. However, the remodelling of vein grafts and the contribution of the endothelium is not well understood. Since nitric oxide (NO) has a crucial role in vascular function, we investigated the importance of NO synthases (NOSs) in vein graft re-endothelialization and remodelling in this study. Mouse isogenic vena cava was grafted into the carotid artery. Progressive remodelling of the grafted veins was evidenced by re-endothelialization at 2 weeks and subsequent appearance of vasomotor function at 4 weeks. Pharmacological inhibition of inducible NOS (iNOS) with the specific inhibitor 1400W, administered between 2 and 4 weeks after grafting, when re-endothelialization was complete, resulted in neoadventitial inflammation, neoadventitial thickening and impaired functional remodelling. Completion of re-endothelialization is pivotal in vein graft remodelling in the mouse and is associated with a series of changes in inflammation, proliferation and initiation of vascular functional remodelling. After re-endothelial-ization, iNOS upregulation may be an important mechanism to prevent secondary neoadventitial inflammation and preserve ongoing functional remodelling. iNOS activity could therefore be beneficial for long-term patency of the vein graft.

Item type: Article
ID code: 26080
Notes: This paper was not accepted by Atherosclerosis and we subsequently sent it to the journal Journal of Vascular Research. It has been accepted by Journal of Vascular Research (acceptance date June 30)
Keywords: vascular research, vein graft , endothelium, adventitia , neointima , Pharmacy and materia medica, Physiology, Cardiology and Cardiovascular Medicine
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
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Depositing user: Strathprints Administrator
Date Deposited: 06 Oct 2010 14:02
Last modified: 27 Mar 2014 09:01
URI: http://strathprints.strath.ac.uk/id/eprint/26080

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