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    Metal-catechol-(amine) networks for surface synergistic catalytic modification: Therapeutic gas generation and biomolecule grafting

    Year: 2020

    Journal: Biomaterials, Volume 248, JUL

    Authors: Gao, Peng; Qiu, Hua; Xiong, Kaiqin; Li, Xiangyang; Tu, Qiufen; Wang, Huaiyu; Lyu, Nan; Chen, Xiao; Huang, Nan; Yang, Zhilu

    Keywords: Metal-catechol-(amine) networks; Catalytic surface; Bivalirudin; Nitric oxide; Surface chemistry; Vascular stent

    Regarding the high requirement of cardiac and vascular implants in tissue engineering, a novel concept of surface chemistry strategy featuring multiple functions is proposed in this study, which provides glutathione peroxidase (GPx)-like catalytic activity and allows secondary reactions for grafting functional biomolecules. The suggested strategy is the fabrication of a metal-catechol-(amine) network (MCAN) containing copper ions with GPx-like activity, amine-bearing hexamethylenediamine (HD) and we adhesive catechol dopamine (DA). With a simple one-step molecular/ion co-assembly, the developed copper-DA-HD (Cu-II-DA/HD) network can be used to catalyze the generation of therapeutic nitric oxide (NO) gas in a durable and dose-controllable manner. The primary amine groups in the Cu-II-DA/HD network facilitate the secondary immobilization of bivalirudin (BVLD) to further provide an antithrombotic activity as supplement to the functions of NO. The CO-DA/HD + BVLD coating functionalized on cardiovascular scents successfully improved thromboresistance, anti-restenosis, and promotes re-endothelialization in vivo. With regard to the ease of operation and low cost, the synergetic modification using MCAN strategy is of great potential for developing multifunctional blood-contacting materials/devices.
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