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Immobilization of chitosan film containing semaphorin 3A onto a microarc oxidized titanium implant surface via silane reaction to improve MG63 osteogenic differentiation

Authors Fang K, Song W, Wang L, Jia S, Wei H, Ren S, Xu X, Song Y

Received 5 June 2014

Accepted for publication 19 July 2014

Published 3 October 2014 Volume 2014:9(1) Pages 4649—4657

DOI https://doi.org/10.2147/IJN.S68895

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Kaixiu Fang,1,* Wen Song,2,* Lifeng Wang,1 Sen Jia,3 Hongbo Wei,1 Shuai Ren,1 Xiaoru Xu,1 Yingliang Song1

1State Key Laboratory of Military Stomatology, Department of Implant Dentistry, School of Stomatology, Fourth Military Medical University, Xi’an, People’s Republic of China; 2State Key Laboratory of Military Stomatology, Department of Prosthetic Dentistry, School of Stomatology, Fourth Military Medical University, Xi’an, People’s Republic of China; 3State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, Fourth Military Medical University, Xi’an, People’s Republic of China

*These authors contributed equally to this work

Abstract: Improving osseointegration of extensively used titanium (Ti) implants still remains a main theme in implantology. Recently, grafting biomolecules onto a Ti surface has attracted more attention due to their direct participation in the osseointegration process around the implant. Semaphorin 3A (Sema3A) is a new proven osteoprotection molecule and is considered to be a promising therapeutic agent in bone diseases, but how to immobilize the protein onto a Ti surface to acquire a long-term effect is poorly defined. In our study, we tried to use chitosan to wrap Sema3A (CS/Sema) and connect to the microarc oxidized Ti surface via silane glutaraldehyde coupling. The microarc oxidization could formulate porous topography on a Ti surface, and the covalently bonded coating was homogeneously covered on the ridges between the pores without significant influence on the original topography. A burst release of Sema3A was observed in the first few days in phosphate-buffered saline and could be maintained for >2 weeks. Coating in phosphate-buffered saline containing lysozyme was similar, but the release rate was much more rapid. The coating did not significantly affect cellular adhesion, viability, or cytoskeleton arrangement, but the osteogenic-related gene expression was dramatically increased and calcium deposition was also abundantly detected. In conclusion, covalent bonding of CS/Sema could strongly improve osteogenic differentiation of osteoblasts and might be applied for Ti implant surface biofunctionalization.

Keywords: titanium, semaphorin 3A, silane reaction, microarc oxidation, osteogenic differentiation

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