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Fabrication and in vivo osteogenesis of biomimetic poly(propylene carbonate) scaffold with nanofibrous chitosan network in macropores for bone tissue engineering

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Abstract

A biomimetic poly(propylene carbonate) (PPC) porous scaffold with nanofibrous chitosan network within macropores (PPC/CSNFs) for bone tissue engineering was fabricated by a dual solid–liquid phase separation technique. PPC scaffold with interconnected solid pore wall structure was prepared by the first phase separation, which showed a high porosity of 91.9% and a good compressive modulus of 14.2 ± 0.56 MPa, respectively. By the second phase separation, nanofibrous chitosan of 50–500 nm in diameter was formed in the macropores with little influence on the pore structure and the mechanical properties of PPC scaffold. The nanofibrous chitosan content was calculated to be 9.78% by elemental analysis. After incubation in SBF for 14 days, more apatite crystals were deposited on the pore surface as well as the nanofibrous chitosan surface of PPC/CSNFs scaffold compared with PPC scaffold. The in vitro culture of bone mesenchymal stem cells showed that PPC/CSNFs scaffold exhibited a better cell viability than PPC scaffold. After implantation in rabbits for 16 weeks, the defect was entirely repaired by PPC/CSNFs scaffold, as opposed to the incomplete healing for PPC scaffold. It indicated that PPC/CSNFs scaffold showed a faster in vivo osteogenesis rate than PPC scaffold. Hereby, PPC/CSNFs scaffold will be a potential candidate for bone tissue engineering.

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Acknowledgments

The authors are grateful to Dr. Huantian Zhang’s kind help in the discussion of biological results analysis, and thankful to financial support from the National High Technology Research and Development Program of China (863 Program) (No. 2007AA09Z440) and the National Natural Science Foundation of China (No. 30900296).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, 510632, China

    Jianhao Zhao, Wanqing Han, Haodong Chen, Mei Tu, Rong Zeng & Changren Zhou

  2. Engineering Research Center of Artificial Organs and Materials, Ministry of Education, Guangzhou, 510632, China

    Jianhao Zhao, Mei Tu, Rong Zeng, Hao Wu, Zhengang Cha & Changren Zhou

  3. Department of Orthopaedics, First Hospital Attached to Jinan University, Guangzhou, 510632, China

    Songwei Huan, Guiqiang Miao, Hao Wu & Zhengang Cha

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  1. Jianhao Zhao
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  2. Wanqing Han
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  4. Mei Tu
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  10. Changren Zhou
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Correspondence to Jianhao Zhao or Mei Tu.

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Zhao, J., Han, W., Chen, H. et al. Fabrication and in vivo osteogenesis of biomimetic poly(propylene carbonate) scaffold with nanofibrous chitosan network in macropores for bone tissue engineering. J Mater Sci: Mater Med 23, 517–525 (2012). https://doi.org/10.1007/s10856-011-4468-3

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  • DOI: https://doi.org/10.1007/s10856-011-4468-3

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