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- Title
Bioactivity of porous biphasic calcium phosphate enhanced by recombinant human bone morphogenetic protein 2/silk fibroin microsphere.
- Authors
Chen, Liang; Gu, Yong; Feng, Yu; Zhu, Xue-Song; Wang, Chun-Zeng; Liu, Hai-Long; Niu, Hai-Yun; Zhang, Chi; Yang, Hui-Lin
- Abstract
To prepare a bioactive bone substitute, which integrates biphasic calcium phosphate (BCP) and rhBMP-2/silk fibroin (SF) microsphere, and to evaluate its characteristics. Hydroxyapatite and β-tricalcium phosphate were integrated with a ratio of 60-40 %. RhBMP-2/SF (0.5 μg/1 mg) microsphere was prepared, and its rhBMP-2-release kinetics was assed. After joining pore-forming agent (Sodium chloride, NaCl), porous BCP/rhBMP-2/SF were manufactured, and its characteristics and bioactivity in vitro were evaluated. Mean diameter of rhBMP-2/SF microsphere was 398.7 ± 99.86 nm, with a loading rate of 4.53 ± 0.08 %. RhBMP-2 was released in a dual-phase pattern, of which fast-release (nearly half of protein released) focused on the initial 3 days, and slow-release sustained more than 28 days. With the increase in concentration of NaCl, greater was porosity and pore size, but smaller mechanical strength of BCP/rhBMP-2/SF. Material with 150 % (w/v) NaCl had an optimal performance, with a porosity of 78.83 %, pore size of 293.25 ± 42.77μm and mechanical strength of 31.03 MPa. Proliferation of human placenta-derived mesenchymal stem cells (hPMSCs) on leaching extract medium was similar to the normal medium ( P = 0.89), which was better than that on control group ( P = 0.03). Activity of alkaline phosphatase on BCP/rhBMP-2/SF surface was higher than on pure BCP at each time point except at 1 day ( P < 0.05). RhBMP-2 has a burst release on early times and a sustaining release on later times. BCP/rhBMP-2/SF with 150 % (w/v) pore-forming agent has excellent porosity, pore size and mechanical strength. The biomaterial induces proliferation and differentiation hPMSCs effectively.
- Subjects
CALCIUM phosphate; BONE morphogenetic proteins; MICROSPHERES; SILK; BONE substitutes
- Publication
Journal of Materials Science: Materials in Medicine, 2014, Vol 25, Issue 7, p1709
- ISSN
0957-4530
- Publication type
Article
- DOI
10.1007/s10856-014-5194-4