Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 79, Issue -, Pages 305-314Publisher
ELSEVIER
DOI: 10.1016/j.msec.2017.05.057
Keywords
Heparin; Aptamer; Re-endothelialization; EPC capture; Hemocompatibility; Stent
Categories
Funding
- National Key Research and Development Program of China [2016YFC1100402]
- Natural Science Foundation of China (NSFC) [81330031]
- Sichuan Province Youth Science and Technology Innovation Team [2016TD0026]
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Good hemocompatibility and rapid endothelialization are two key factors in the success of stent interventional therapy. In this study, aptamers with the ability to capture endothelial progenitors and anticoagulant molecular heparin were successfully immobilized on the surface of dopamine/polyethylenimine (PDA/PEI) copolymer coating via electrostatic interaction. The results of X-ray spectroscopy (XPS), water contact angle (WCA), and immunofluorescence staining tests confirmed the successful introduction of heparin and aptamers. Platelet adhesion and whole blood experiments demonstrated that the hemocompatibility of the co-modified surface was improved. Dynamic endothelial progenitor cell (EPC) capture experiments showed that the modified surfaces could effectively capture the endothelial progenitor in dynamic conditions. More importantly, ex vivo experiments revealed that the modified surfaces could regulate the distribution of CD34/vWF-positive cells on stent surfaces, and this was beneficial for the endothelialization of vascular stents. These results suggested that heparin and aptamer co-modified stents could capture EPCs and promote endothelialization. This surface co-modification strategy has great potential for enhancing stent development. (C) 2017 Elsevier B.V. All rights reserved.
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