利用复合生物支架材料构建全生物型小口径组织工程血管的研究

目的利用复合纤维蛋白胶生物支架材料和血管细胞成分体外构建具有完整中膜及内皮层的全生物型小口径组织工程血管。方法体外培养扩增猪主动脉血管内皮细胞及平滑细胞，将血管平滑肌细胞与猪纤维蛋白胶混合，均匀复合于犬颈总动脉脱细胞基质材料外表面，经培养后将血管内皮细胞悬液种植到基质材料的内表面，构建全生物型小口径组织工程血管。通过组织学染色观察组织工程血管的组织学结构，扫描电镜观察血管的内外表面结构。结果组织学染色结果表明构建的小口径组织工程血管具有完整的内膜层及中膜层结构；扫描电镜结果显示组织工程血管内表面覆盖着完整的内皮细胞层，血管的外表面可见分层排列的血管平滑肌细胞。结论利用纤维蛋白胶血管细胞混合液复合犬颈总动脉脱细胞基质可以构建出具有完整中膜及内膜层的全生物型小口径组织工程血管。

Construction of Completely Biological Tissue-Engineered Small-Diameter Blood Vessel Based on a Biological Hybrid Scaffold

ObjectiveTo prepare completely biological tissue-engineered small-diameter blood vessel based on a biological hybrid scaffold.MethodsEndothelial cells and smooth muscle cells were isolated from the porcine aorta and expanded in vitro. Mixture of smooth muscle cells and porcine fibrin was prayed coating on the decellularized canine carotid artery. Then, the inner surface of the decellularized artery was seeded with the endothelial cells to construction of completely biological tissue-engineered small-diameter blood vessel. The tissue-engineered blood vessel was evaluated with Hematoxylin and Eosin (H&E) staining and scanning electron microscopy.ResultsHistology examination revealed that the completely biological tissue-engineered small-diameter had intact media and intima. Scanning electron microscopy examination confirmed that the inner surface of tissue-engineered blood vessel was covered with intact monolayer endothelial cells and the external surface was covered with multilayer smooth muscle cells.ConclusionThe completely biological tissue-engineered small-diameter with intact media and intima was prepared using mixture of blood vessel cells and porcine fibrin on the decellularized canine carotid artery.