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Thick PCL Fibers Improving Host Remodeling of PGS‐PCL Composite Grafts Implanted in Rat Common Carotid Arteries
Small ( IF 13.0 ) Pub Date : 2020-11-30 , DOI: 10.1002/smll.202004133
Jiayin Fu 1 , Michael Wang 2 , Iwijn De Vlaminck 2 , Yadong Wang 2
Affiliation  

Vasculopathy and the consequential ischemia are major medical challenges. Grafting is an effective treatment to vascular occlusion. However, autologous grafting, despite scarcity, is the only choice for small diameter blood vessels. Synthetic grafts can fill the gap if they can work satisfactorily in arterial circulation. Electrospun polycaprolactone (PCL) sheathed porous poly(glycerol sebacate) (PGS) vascular grafts have good performances in arterial circulation in abdominal aortas and carotid arteries in rats. However, a major issue associated with the graft remodeling in vivo is limited neo‐tissue formation inside PCL sheaths. Small pores of PCL sheaths inhibit cell infiltration and migration. To increase porosity of PCL sheaths of PGS‐PCL composite grafts, diameters of electrospun PCL fibers are increased. The thick PCL fibers encourage cell migration and elicit a higher degree of CD206+ cells. In addition, some of the CD206+ cells co‐express vascular cell markers in the thick‐fiber grafts. The thick‐fiber grafts also show improved mechanical properties and a higher elastin and collagen content. The data demonstrate the feasibility of improving graft vascular remodeling by increasing PCL fiber diameters and the critical role of CD206+ cells during graft vascular remodeling.

中文翻译:

粗PCL纤维可改善植入大鼠颈总动脉的PGS‐PCL复合移植物的宿主重塑

血管病和随之而来的缺血是主要的医学挑战。移植是治疗血管阻塞的有效方法。然而,尽管缺乏自体移植,小直径血管的唯一选择。如果合成移植物可以在动脉循环中令人满意地工作,则可以填补空白。电纺聚己内酯(PCL)包覆的多孔聚癸二酸甘油酯(PGS)血管移植物在大鼠腹主动脉和颈动脉的动脉循环中具有良好的性能。但是,与体内移植物重塑相关的主要问题是PCL鞘内新组织的形成受到限制。PCL鞘的小孔抑制细胞浸润和迁移。为了增加PGS‐PCL复合移植物的PCL鞘的孔隙率,增加了电纺PCL纤维的直径。+细胞。此外,一些CD206 +细胞在粗纤维移植物中共表达血管细胞标记物。厚纤维移植物还显示出改善的机械性能以及更高的弹性蛋白和胶原蛋白含量。数据证明了通过增加PCL纤维直径和在移植血管重塑过程中CD206 +细胞的关键作用来改善移植血管重塑的可行性。
更新日期:2020-12-28
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