期刊
ACS BIOMATERIALS SCIENCE & ENGINEERING
卷 4, 期 9, 页码 3291-3303出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.8b00459
关键词
strontium-substituted hydroxyapatite; silk fibroin; heparin; BMP-2; bone regeneration
资金
- Natural Science Foundation of China [81573708, 31271019]
- Science Foundation of Guangdong Province [2015A030306049]
- Science and Technology Program of Guangzhou [201601010270, 2017010160489, 201704030083]
- Pearl River S&T Nova Program of Guangzhou [201710010155, 201806010072]
- Guangdong Special Support Program for High-level Talents [2015TQ01R588]
- Discipline of Integrated Chinese and Western Medicine in Guangzhou University of Chinese Medicine [YN2015MS21]
- Science and Technology Project of Guangdong province [2015A010101313, 2017A050506011, 2017A050501013, <LF>2017B090911012]
The objective of this study was to develop heparin-conjugated strontium-substituted hydroxyapatite/silk fibroin (Sr-nHAp/SF-Hep) scaffold loaded bone morphogenetic proteins-2 (BMP-2) with sustained release to improve bone regeneration. The average pore diameters and porosity of Sr-nHAp/SF scaffolds were respectively approximately 150 urn and 90%. The mechanical properties and thermostability of the Sr-nHAp/SF scaffolds were significantly stronger than those of the SF scaffold. The weight of composite scaffolds is higher than that of the SF scaffold in simulated body fluids. The Sr-nHAp/SF scaffold exhibited excellent biological function of bone marrow mesenchymal stem cell (BMSC) proliferation and adhesion. The expression of related osteogenic genes, including osteocalcin, osteopontion, and alkaline phosphatase activity was elevated by Sr-nHAp/SF-Hep-BMP-2 scaffold, which promoted the differentiation of BMSCs into osteoblasts. In vivo results showed that Sr-nHAp/SF-Hep-BMP-2 scaffolds enhanced bone mineral density and improved new bone regeneration, which was accomplished through microcomputed tomography (micro-CT) and histological and histochemical staining analysis. These results demonstrated SrnHAp/SF-Hep-BMP-2 scaffolds with favorable biocompatibility and good mechanical properties have great potential to repair bone defects.
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