Abstract
Vessel wall inflammation and matrix destruction are critical to abdominal aortic aneurysm (AAA) formation and rupture. We have previously shown that urokinase plasminogen activator (uPA) is highly expressed in experimental AAA and is essential for AAA formation and expansion. In this study, we examined the effects of overexpression of a natural inhibitor of uPA, plasminogen activator inhibitor-1 (PAI-1), on the development of angiotensin (Ang) II-induced AAA in ApoE-deficient (ApoE−/−) mice. Mice were treated with recombinant adenovirus containing either the human PAI-1 gene (Ad5.CMV.PAI-1) or the luciferase gene (Ad5.CMV.Luc) delivered either locally by intra-adventitial injection or systemically by tail vein injection. Our results show that local delivery of the PAI-1 gene completely prevented AAA formation (0 vs 55.6% in Ad5.CMV.Luc controls, P<0.05). In contrast, systemic delivery of the PAI-1 gene did not affect AAA incidence (78 vs 90% in Ad5.CMV.Luc controls, P=0.125). Local delivery of the PAI-1 gene 2 weeks after Ang II infusion prevented further expansion of small aneurysms, but had no significant effect on the progression of larger aneurysms. These data suggest that local PAI-1 gene transfer could be used to stabilize small AAA and reduce the rate of expansion and risk of rupture.
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Acknowledgements
We express sincere thanks to Dr Peter Carmeliet (Center for Molecular and Vascular Biology, Department of Transgene Technology and Gene Therapy, KU Leuven, Belgium) for the gift of Ad5.CMV.PAI-1. We thank Ana Freay and Linda Cashion for technical assistance.
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Qian, H., Gu, JM., Liu, P. et al. Overexpression of PAI-1 prevents the development of abdominal aortic aneurysm in mice. Gene Ther 15, 224–232 (2008). https://doi.org/10.1038/sj.gt.3303069
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DOI: https://doi.org/10.1038/sj.gt.3303069
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