| Title | Reduction of early vein graft thrombosis by tissue plasminogen activator gene transfer. | | Author(s) | Thomas AC, Wyatt MJ, Newby AC | | Institution | Bristol Heart Institute, University of Bristol, 7th Floor, Bristol Royal Infirmary, Bristol BS2 8HW, United Kingdom. E-mail: a.thomas@bristol.ac.uk. | | Source | Thromb Haemost 2009 Jul; 102(1):145-52. | | Abstract | Vein grafts are used to bypass coronary arterial stenosis, but many grafts thrombose soon after surgery. A model was developed in the pig to allow continuous measurement of blood flow and production of flow-restricting thrombi (cyclic flow reductions; CFRs). Saphenous vein lumen was exposed to adenovirus ex vivo, to over-express human tissue plasminogen activator (h-tPA), with beta-galactosidase adenovirus as a control. The vein segments were engrafted into carotid arteries and examined 0, 1 or 3 days later (4-7 animals/group). Untransduced grafts examined on the day of surgery developed repeated CFRs at both normal and restricted flow, but their frequency declined in grafts examined after 3 days. Adenovirus transduction was evident as beta-galactosidase or h-tPA expression 1 day after engraftment. Blood flow was increased 1.4-fold in h-tPA transduced grafts after 1 day [control 390 (280-510), h-tPA 550 (450-660) ml/min; p=0.02 (expressed as mean (95% confidence intervals)]. CFRs were less severe (p=0.002) in the h-tPA transduced grafts than beta-galactosidase-transduced grafts. CFRs were also less frequent in unstenosed undamaged h-tPA grafts [control 17 (6.1-29), h-tPA 7.6 (1.7-14) CFR/hr; p=0.02], but this difference was reduced after damage or stenosis. CFRs formed faster in h-tPA than in beta-galactosidase-transduced grafts [control 14 (11-17), h-tPA 23 (19-27) ml/min(2); p<0.001], and resolved twofold faster [control 25 (22-30), h-tPA 48 (39-60) ml/min(2); p<0.001]. Hence, in this model, local gene therapy with h-tPA increased graft blood flow and decreased measures of early graft thrombosis, namely quicker CFR resolution and decreased frequency and severity. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 19572079 |
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