Abstract
Though the efficacy of intravascular gene transfer has been demonstrated in native vessels following acute injury, this methodology has not been validated in complex models of vascular injury that more closely mimic clinical angioplasty procedures. Previous studies have shown that Gax gene overexpression modulates the injury-induced remodeling of the vessel in rat carotid and normal rabbit iliac arteries. Here, we evaluated the effect of the Gax gene delivery in atheromatous stented vessels. Rabbits were fed 120 g daily of 1% cholesterol diet for 3 weeks. At 1 week they underwent initial injury on the external iliac artery, then balloon angioplasty was performed at 3 weeks at the same site with a 2.5 mm diameter channel balloon catheter (three times 1 min at 6 atm). Either saline (n = 4) or the control viral construct Ad-CMVluc (5 × 109p.f.u.) (n = 5) or Ad-CMVGax (5 × 109 p.f.u.) (n = 4) was delivered with a poloxamer mixture via a channel balloon (6 atm, 30 min), and a 15 mm long Palmaz–Schatz stent (PS154) was then deployed at the site (1 min, 8 atm). Arteries were analyzed 1 month later. At 1 month, the Ad-CMVGax treated arteries exhibited a lower maximal intimal area (1.15 ± 0.1 mm2) than saline (1.87 ± 0.15 mm2, P = 0.007) or Ad-CMVluc-treated vessels (1.98 ± 0.31 mm2, P = 0.04). Likewise Ad-CMVGax-treated vessels displayed a lower maximal percentage cross-sectional area narrowing (35.1 ± 3.5%) than saline (65.3 ± 9.4%, P = 0.01) or Ad-CMVluc-treated vessels (62.7 ± 6.7%, P = 0.02). Angiographic analysis revealed larger minimal lumen diameter in Ad-CMVGax treated arteries (2.0 ± 0.1 mm) than saline (1.14 ± 0.36 mm, P = 0.06) or Ad-CMVluc-treated vessels (1.23 ± 0.25 mm, P = 0.02). Overexpression of the Gax gene inhibits neointimal hyperplasia and lumen loss in atheromatous stented rabbit iliac arteries.
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Acknowledgements
This work was supported by NIH grants AR40197 and AG15052 and HL50692 to KW and NIH grants HL02824 and HL53354 to JMI. LM was supported by the French Federation of Cardiology. Eric Van Belle was the recipient of a fellowship from the French Ministry of Foreign Affairs ‘Bourse Lavoisier’ and a grant from the University Hospital of Lille. The authors gratefully acknowledge Jim Barry and Maria Palasis, Boston Scientific for providing catheters and Johnson and Johnson for providing stents. Our thanks to Aude Le Roux and Jean-Marc Guillaume for viral supply/stock production.
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Maillard, L., Van Belle, E., Tio, F. et al. Effect of percutaneous adenovirus-mediated Gax gene delivery to the arterial wall in double-injured atheromatous stented rabbit iliac arteries. Gene Ther 7, 1353–1361 (2000). https://doi.org/10.1038/sj.gt.3301255
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DOI: https://doi.org/10.1038/sj.gt.3301255
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