Preparation of biomimetic prosthesis prepared from cultured smooth muscle cells and endothelial cells.

众所周知，动脉假体，特别是那些小直径的假体，往往与血栓形成和增殖有关。此外，保持机械强度以承受动脉压力是必要的。已经进行了一些不成功的试验，使用由涤纶或种植内皮细胞的膨胀聚四氟乙烯(e-PTFE)制成的人工假体来防止血栓形成和增殖。为了解决这些问题，人们尝试了同种异体静脉移植和达迪克移植(用戊二醛处理的脐静脉)。最近，当胸内动脉的同种异体动脉移植用于主动脉-冠状动脉搭桥术时，效果有所改善。有鉴于此，我们认为动脉结构可能在预防动脉增生和动脉压抵抗方面发挥作用。在本研究中，以犬动脉壁为原料，用甲酸提取法制备了一种仿生假体。在此条件下，由弹性板层组成的动脉结构保持不变，抗拉强度保持不变。在胶原、纤维连接蛋白和纤维蛋白原存在的情况下，51&lt；51&gt；铬内皮细胞在假体表面的附着得到增强。这些药物还增强了^&lt；51&gt；Cr血小板的粘附性。然而，内皮细胞预先附着到假体上可以防止血小板粘连。这项研究证明了一种新的仿生动脉假体的生产应该被证明是有用的，特别是在研究血栓形成和增殖的机制方面。这项工作部分得到了日本文部科学省的资助。

It is well know that arterial prostheses, especially those of small diameter, are often associated with thrombus formation and hyperplasia. In addition, it is necessary to retain the mechanical strength to withstand arterial pressure.A number of unsuccessful trials have been carried out using artificial prostheses made of Dacron or expanded polytetra fluoethylene (e-PTFE) seeded with endothelial cells to prevent thrombus formation and hyperplasia. To solve these problems, vein allograft and Dardik graft (umbilical vein treated with glutaraldehyde) have been tried. More recently, improved results have been seen when arterial allografts of the internal thoracic artery have been used in aortocoronary bypass operations. In view of this we considered that the arterial architecture may play a role in the prevention of hyperplasia and reistance to arterial pressure.In this study, a biomimetic prosthesis was prepared from canine arterial wall by extraction with formic acid. Under these conditions, the arterial architecture consisting of elastic lamella was conserved and the tensile strength was retained. Attachment of ^<51>Cr-endothelial cells to the surface of the prosthesis was enhanced in the presence of collagen, fibronectin, and fibrinogen. These agents also enhanced the adhesion of ^<51>Cr platelets. However, preattachment of endothelial cells to prostheses prevented platelet adhesion.This study demonstrates the production of a novel biomimetic arterial prosthesis that should prove useful, particularly in an investigation of the mechanism of thrombosis and hyperplasia.This work was supported in part by a grant from the Ministry of Education, Science and Culture of Japan.