Choi, Won Sup Joung, Yoon Ki Lee, Yunki Bae, Jin Woo Park, Han Ki Park, Young Hwan Park, Jong-Chul Park, Ki Dong 2024-01-20T05:00:52Z 2024-01-20T05:00:52Z 2021-09-04 2016-02-24 1944-8244 https://pubs.kist.re.kr/handle/201004/124372 The clinical utility of a small-caliber vascular graft is still limited, owing to the occlusion of graft by thrombosis and restenosis. A small-caliber vascular graft (diameter, 2.5 mm) fabricated by electrospinning with a polyurethane (PU) elastomer (Pellethane) and biofunctionalized with heparin and two cell-adhesive peptides, GRGDS and YIGSR, was developed for the purpose of preventing the thrombosis and restenosis through antithrombogenic activities and endothelialization. The vascular grafts showed slightly reduced adhesion of platelets and significantly decreased adsorption of fibrinogen. In vitro studies demonstrated that peptide treatment on a vascular graft enhanced the attachment of human umbilical vein endothelial cells (HUVECs), and the presence of heparin and peptides on the graft significantly increased the proliferation of HUVECs. In vivo implantation of heparin/peptides coimmobilized graft (PU-PEG-Hep/G+Y) and PU (control) grafts was performed using an abdominal aorta rabbit model for 60 days followed by angiographic monitoring and explanting for histological analyses. The patency was significantly higher for the modified PU grafts (71.4%) compared to the PU grafts (46.2%) at 9 weeks after implantation. The nontreated PU grafts showed higher levels of alpha-SMA expression compared to the modified grafts, and for both samples, the proximal and distal regions expressed higher levels compared to the middle region of the grafts. Moreover, immobilization of heparin and peptides and adequate porous structure were found to play important roles in endothelialization and cellular infiltration. Our results strongly encourage that the development of small-caliber vascular grafts is feasible. English American Chemical Society IN-SITU ENDOTHELIALIZATION NEOINTIMAL HYPERPLASIA EXPANDED POLYTETRAFLUOROETHYLENE SURFACE MODIFICATION RGD PEPTIDE BLOOD EPTFE IMMOBILIZATION GROWTH NEOVASCULARIZATION Enhanced Patency and Endothelialization of Small-Caliber Vascular Grafts Fabricated by Coimmobilization of Heparin and Cell-Adhesive Peptides Article 10.1021/acsami.5b12052 1 ACS Applied Materials & Interfaces, v.8, no.7, pp.4336 - 4346 ACS Applied Materials & Interfaces 8 7 4336 4346 scie scopus 000371105800011 2-s2.0-84961792815 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article IN-SITU ENDOTHELIALIZATION NEOINTIMAL HYPERPLASIA EXPANDED POLYTETRAFLUOROETHYLENE SURFACE MODIFICATION RGD PEPTIDE BLOOD EPTFE IMMOBILIZATION GROWTH NEOVASCULARIZATION vascular graft polyurethane heparin cell-adhesive peptide antithrombogenic activities endothelialization