A completely biological "off-the-shelf" arteriovenous graft that recellularizes in baboons

Science Translational Medicine
Zeeshan SyedainRobert T Tranquillo

Abstract

Prosthetic arteriovenous grafts (AVGs) conventionally used for hemodialysis are associated with inferior primary patency rates and increased risk of infection compared with autogenous vein grafts. We tissue-engineered an AVG grown from neonatal human dermal fibroblasts entrapped in bovine fibrin gel that is then decellularized. This graft is both "off-the-shelf" (nonliving) and completely biological. Grafts that are 6 mm in diameter and about 15 cm in length were evaluated in a baboon model of hemodialysis access in an axillary-cephalic or axillary-brachial upper arm AVG construction procedure. Daily antiplatelet therapy was given. Grafts underwent both ultrasound assessment and cannulation at 1, 2, 3, and 6 months and were then explanted for analysis. Excluding grafts with cephalic vein outflow that rapidly clotted during development of the model, 3- and 6-month primary patency rates were 83% (5 of 6) and 60% (3 of 5), respectively. At explant, patent grafts were found to be extensively recellularized (including smoothelin-positive smooth muscle cells with a developing endothelium on the luminal surface). We observed no calcifications, loss of burst strength, or outflow stenosis, which are common failure modes of other graft m...Continue Reading

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