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Int. J. Mol. Sci. 2017, 18(4), 858; doi:10.3390/ijms18040858

Silk Fibroin-Alginate-Hydroxyapatite Composite Particles in Bone Tissue Engineering Applications In Vivo

1
Sericultural & Apicultural Materials Division, National Institute of Agricultural Science, Wanju 55365, Korea
2
Department of Oral and Maxillofacial Surgery, Gangneung-Wonju National University, Gangneung 25457, Korea
3
Analysis Research Division, Daegu Center, Korea Basic Science Institute, Daegu 41566, Korea
4
Department of Oral and Maxillofacial Surgery, Chungbuk National University College of Medicine, Cheongju 28644, Korea
5
Department of Oral and Maxillofacial Surgery, Chungbuk National University Hospital, Cheongju 28644, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: John George Hardy
Received: 16 February 2017 / Revised: 28 March 2017 / Accepted: 13 April 2017 / Published: 18 April 2017
(This article belongs to the Section Biomaterial Sciences)
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Abstract

The aim of this study was to evaluate the in vivo bone regeneration capability of alginate (AL), AL/hydroxyapatite (HA), and AL/HA/silk fibroin (SF) composites. Forty Sprague Dawley rats were used for the animal experiments. Central calvarial bone (diameter: 8.0 mm) defects were grafted with AL, AL/HA, or AL/HA/SF. New bone formation was evaluated by histomorphometric analysis. To demonstrate the immunocompatibility of each group, the level of tumor necrosis factor (TNF)-α expression was studied by immunohistochemistry (IHC) and quantitative reverse transcription polymerase chain reaction (qRT-PCR) at eight weeks post implantation. Additionally, osteogenic markers, such as fibroblast growth factor (FGF)-23, osteoprotegerin (OPG), and Runt-related transcription factor (Runx2) were evaluated by qPCR or IHC at eight weeks post implantation. The AL/HA/SF group showed significantly higher new bone formation than did the control group (p = 0.044) and the AL group (p = 0.035) at four weeks post implantation. Additionally, the AL/HA/SF group showed lower relative TNF-α mRNA levels and higher FGF-23 mRNA levels than the other groups did at eight weeks post implantation. IHC results demonstrated that the AL/HA/SF group had lower TNF-α expression and higher OPG and Runx2 expression at eight weeks post implantation. Additionally, no evidence of the inflammatory reaction or giant cell formation was observed around the residual graft material. We concluded that the AL/HA/SF composite could be effective as a scaffold for bone tissue engineering. View Full-Text
Keywords: Keywords: silk fibroin; alginate; hydroxyapatite; tumor necrosis factor α Keywords: silk fibroin; alginate; hydroxyapatite; tumor necrosis factor α
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MDPI and ACS Style

Jo, Y.-Y.; Kim, S.-G.; Kwon, K.-J.; Kweon, H.; Chae, W.-S.; Yang, W.-G.; Lee, E.-Y.; Seok, H. Silk Fibroin-Alginate-Hydroxyapatite Composite Particles in Bone Tissue Engineering Applications In Vivo. Int. J. Mol. Sci. 2017, 18, 858.

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