Development, Analyze and Clinical Use of Tissue Engineering Large Diameter Autografts

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This study demonstrates the evaluation of tissue-engineered vascular autografts (TEVAs) constructed with autologous mononuclear-bone marrow cells (MN-BMCs) and a biodegradable scaffold using a canine inferior vena cava (IVC) model.MN-BMCs were obtained from a dog and seeded onto a biodegradable tubular scaffold consisting of polyglycolide fiber and poly(1-lactide-co-ε-caprolactone) sponge. This scaffold was implanted in the IVC of the same dog on the day of surgery. TEVAs were analyzed biochemically, biomechanically and histologically after implantation. When TEVAs were explanted and stimulated with acetylcholine at 1 month, they dose dependently produced nitrates and nitrites. N^G-nitro-L-arginine methylester significantly inhibited these reactions. On the stimulation by acetylcholine, factor VIII-positive cells of TEVAs produced eNOS proteins, and the ratio of eNOS/s17 mRNA were similar among native IVC, 1-and 3-months TEVAs. TEVAs had similar biochemical properties and wall thickness as native IVC at 6 months after implantation, and tolerated venous pressure well without any problems such as calcification.These results indicate that TEVAs are biocompatible material with functional endothelial cells and biomechanical properties without unwanted side-effects.