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Modification of vascular tone using iNOS under the control of a radiation-inducible promoter

Worthington, Jenny, Robson, T, Murray, M, O'Rourke, M, Keilty, G and Hirst, DG (2000) Modification of vascular tone using iNOS under the control of a radiation-inducible promoter. GENE THERAPY, 7 (13). pp. 1126-1131. [Journal article]

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It may be therapeutically advantageous to alter tumour blood supply specifically. Nitric oxide is a potent vasodilator which is produced in many tissues by the enzyme nitric oxide synthase (NOS). We have transfected cDNA for the inducible isoform of this enzyme (iNOS), under the control of the radiation-inducible promoter WAF1. The activity of the promoter was initially assessed using green fluorescent protein (GFP) in both endothelial cells and rat tail artery segments, Induction of protein expression by 9.5- and 4.5-fold respectively, was observed after a radiation dose of 4 Gy. Artery sections were then transfected with the WAF1/iNOS construct; this gave five-fold induction of iNOS protein after a dose of 4 Gy. The transfected artery was also tested functionally for relaxation, indicative of NO production. One hour after exposure to 4 Gy there was a significant (65%) relaxation of artery segments that had been preconstricted with phenylephrine. This could be partially reversed by the NOS inhibitor nitro-L-arginine. This study demonstrates that we can regulate vascular tone using an X-ray inducible promoter.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Genomic Medicine
ID Code:5819
Deposited By: Dr Jenny Worthington
Deposited On:04 Jan 2010 09:54
Last Modified:10 May 2017 10:33

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