Molecular design of an ultra-strong tissue adhesive hydrogel with tunable multifunctionality  

作　　者：Yuting Zheng Avijit Baidya Nasim Annabi 

机构地区：[1]Department of Chemical and Biomolecular Engineering,University of Californi1,Los Angeles,Los Angeles,CA,90095,United States [2]Department of Bioengineering,University of Californi1,Los Angeles,Los Angeles,CA,90095,United States

出　　处：《Bioactive Materials》2023年第11期214-229,共16页生物活性材料（英文）

基　　金：the National Institutes of Health(R01-EB023052;R01HL140618).

摘　　要：Designing adhesive hydrogels with optimal properties for the treatment of injured tissues is challenging due to the tradeoff between material stiffness and toughness while maintaining adherence to wet tissue surfaces. In most cases, bioadhesives with improved mechanical strength often lack an appropriate elastic compliance, hindering their application for sealing soft, elastic, and dynamic tissues. Here, we present a novel strategy for engineering tissue adhesives in which molecular building blocks are manipulated to allow for precise control and optimization of the various aforementioned properties without any tradeoffs. To introduce tunable mechanical properties and robust tissue adhesion, the hydrogel network presents different modes of covalent and noncovalent interactions using N-hydroxysuccinimide ester (NHS) conjugated alginate (Alg-NHS), poly (ethylene glycol) diacrylate (PEGDA), tannic acid (TA), and Fe^(3+) ions. Through combining and tuning different molecular interactions and a variety of crosslinking mechanisms, we were able to design an extremely elastic (924%) and tough (4697 kJ/m3) multifunctional hydrogel that could quickly adhere to wet tissue surfaces within 5 s of gentle pressing and deform to support physiological tissue function over time under wet conditions. While Alg-NHS provides covalent bonding with the tissue surfaces, the catechol moieties of TA molecules synergistically adopt a mussel-inspired adhesive mechanism to establish robust adherence to the wet tissue. The strong adhesion of the engineered bioadhesive patch is showcased by its application to rabbit conjunctiva and porcine cornea. Meanwhile, the engineered bioadhesive demonstrated painless detachable characteristics and in vitro biocompatibility. Additionally, due to the molecular interactions between TA and Fe3+, antioxidant and antibacterial properties required to support the wound healing pathways were also highlighted. Overall, by tuning various molecular interactions, we were able to develop a single-hydrogel platform wit

关 键 词：Molecular engineering Tough hydrogel BIOADHESIVE Multifunctionality 

分 类 号：R318[医药卫生—生物医学工程] TB3[医药卫生—基础医学]