组织工程技术构建小口径血管的实验研究

Experimental study on constructing small-caliber artery by tissue engineering approach

目的 探讨运用组织工程技术构建血管组织的方法。 方法 将体外培养、扩增的新生婴儿脐静脉血管内皮细胞与平滑肌细胞接种于片状聚羟基乙酸材料上 ,形成细胞 材料复合物 ,将该复合物包绕于硅胶管使成管状结构后移植于裸鼠皮下 ,第 2及第 6周后行大体及组织学检测。结果 组织工程技术构建的血管组织大体结构与天然血管相似 ,免疫组化显示组织工程化血管最内层有Ⅷ因子阳性细胞覆盖 ,管壁内有大量细胞外基质及散在的α 平滑肌肌动蛋白阳性细胞存在。结论 运用组织工程技术可形成具有与正常血管组织学结构相似的血管。

Objective To investigate the possibility of constructing small-caliber artery by means of tissue engineering. Methods Cell-PGA mixtures were made by separately seeding 1×10 7smooth muscle cells and 5×10 6 endothelial cells isolated from neonate umbilicus onto PGA scaffold, the cell-PGA constructs were wrapped around a silicone tube before its implantation subcutaneously to nude mice and the mice were sacrificed in 2 and 6 weeks. The tissue engineered artery (TEA) were examined both grossly and immunohistochemically. Results The gross appearance of TEA was similar to that of the natural counterparts; histologic and immunohistochemical analyses of the neoformed tissues revealed a typical artery structure, including the presence of EC at the luminal surface and the presence of SMC and collagen in the wall. Conclusion TEA with histology similar to natural vessel can be constructed by tissue engineering.