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Chitosan/biphasic calcium phosphate scaffolds functionalized with BMP‐2‐encapsulated nanoparticles and RGD for bone regeneration
Author(s) -
Gan Donglin,
Liu Min,
Xu Tong,
Wang Kefeng,
Tan Hui,
Lu Xiong
Publication year - 2018
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.36453
Subject(s) - materials science , chitosan , bioceramic , tissue engineering , extracellular matrix , nanoparticle , bone morphogenetic protein 2 , bone tissue , regeneration (biology) , biomedical engineering , biophysics , in vitro , nanotechnology , chemistry , microbiology and biotechnology , biochemistry , medicine , biology
Advancements in bone tissue engineering require the improvement of tissue scaffolds, which should not only exhibit suitable mechanical properties and highly porous structures, but also effectively carry signaling molecules that can mediate bone formation and tissue regeneration. In the present study, we established chitosan/biphasic calcium phosphate (CS/BCP) scaffolds functionalized with Arg–Gly–Asp (RGD) and BMP‐2‐loaded nanoparticles. The resulting scaffolds were highly similar to natural bone extracellular matrix (ECM) in terms of composition and structural properties. First, we synthesized CS/BCP composite bionic scaffolds via the freeze‐drying method. Then, RGD peptides were covalently conjugated onto the scaffolds via the EDC/NHS method. The BMP‐2‐encapsulated BSA nanoparticles were prepared via a desolvation method and then coated with CS and oxidized alginate to achieve sustained release of BMP‐2. In vitro cell culture and in vivo implantation tests confirmed that RGD and BMP‐2 synergistically enhanced cell attachment and spreading by providing integrin binding surface and facilitating osteogenic differentiation. In summary, the bioceramic/biopolymer scaffolds functionalized with signaling biomolecules successfully provided a favorable microenvironment for bone formation and thus serve as potential candidates for use in bone tissue engineering. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2613–2624, 2018.