期刊
BIOMATERIALS
卷 31, 期 4, 页码 779-791出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2009.09.082
关键词
Recombinant protein polymer; Elastin-mimetic; Biocompatibility; Biostability; Magnetic resonance imaging
资金
- NIH [HL60464, HL083867]
- RES
- AWM
- NSF
- Robert P. Apkarian Integrated Electron Microscopy Core of Emory University
Unless chemically crosslinked, matrix proteins, such as collagen or silk, display a limited lifetime in vivo with significant degradation observed over a period of weeks. Likewise, amphiphilic peptides, lipopeptides, or glycolipids that self-assemble through hydrophobic interactions to form thin films, fiber networks, or vesicles do not demonstrate in vivo biostability beyond a few days. We report herein that a self-assembling, recombinant elastin-mimetic triblock copolymer elicited minimal inflammatory response and displayed robust in vivo stability for periods exceeding I year, in the absence of either chemical or ionic crosslinking. Specifically, neither a significant inflammatory response nor calcification was observed upon implantation of test materials into the peritoneal cavity or subcutaneous space of a mouse model. Moreover, serial quantitative magnetic resonance imaging, evaluation of pre- and post-explant ultrastructure by cryo-high resolution scanning electron microscopy, and an examination of implant mechanical responses revealed substantial preservation of form, material architecture, and biomechanical properties, providing convincing evidence of a non-chemically or ionically crosslinked protein polymer system that exhibits long-term stability in vivo. (C) 2009 Elsevier Ltd. All rights reserved.
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