Abstract
Type I collagen was added to the composite chitosan solution in a ratio of 1:2 to build a physical cross-linked self-forming chitosan/collagen/β-GP hydrogel. Osteogenic properties of this novel injectable hydrogel were evaluated. Gelation time was about 8 min which offered enough time for handling a mixture containing cells and the subsequent injection. Scanning electronic microscopy (SEM) observations indicated good spreading of bone marrow mesenchymal stem cells (BMSCs) in this hydrogel scaffold. Mineral nodules were found in the dog-BMSCs inoculated hydrogel by SEM after 28 days. After subcutaneous injection into nude mouse dorsum for 4 weeks, partial bone formation was observed in the chitosan/collagen/β-GP hydrogel loaded with pre-osteodifferentiated dog-BMSCs, which indicated that chitosan/collagen/β-GP hydrogel composite could induce osteodifferentiation in BMSCs without exposure to a continual supply of external osteogenic factors. In conclusion, the novel chitosan/collagen/β-GP hydrogel composite should prove useful as a bone regeneration scaffold.
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This work was partly supported by the National Science Foundation of China (NSFC: 50901088).
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Bin Sun and Wei Ma have contributed equally to this work.
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Sun, B., Ma, W., Su, F. et al. The osteogenic differentiation of dog bone marrow mesenchymal stem cells in a thermo-sensitive injectable chitosan/collagen/β-glycerophosphate hydrogel: in vitro and in vivo. J Mater Sci: Mater Med 22, 2111–2118 (2011). https://doi.org/10.1007/s10856-011-4386-4
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DOI: https://doi.org/10.1007/s10856-011-4386-4