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Biomimetic porous silk fibroin/biphasic calcium phosphate scaffold for bone tissue regeneration

  • Tissue Engineering Constructs and Cell Substrates
  • Original Research
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Abstract

The purpose of our study is to prepare a biomimetic porous silk fibroin (SF)/biphasic calcium phosphate (BCP) scaffold, and evaluate its performance in bone tissue regeneration. The differences in pore size, porosity, mechanical strength and biocompatibility of four different fibroin-containing scaffolds (0, 20, 40, and 60% SF) were studied in vitro. After inoculation with MC3T3-E1 cells, the ectopic bone formation ability of the SF/BCP bionic scaffold was evaluated in a rat model. The SEM and CT demonstrated that compared with pure BCP group (0% SF), the pore size and porosity of SF/BCP scaffolds were proportional to SF content, of which 40% of SF and 60% of SF groups were more suitable for cell growth. The compressive strength of SF/BCP scaffold was greater than that of the pure BCP scaffold, and showed a trend of first increasing and then decreasing with the increase of SF content, among which 40% of SF group had the maximum compressive strength (40.80 + 0.68) MPa. The SF/BCP scaffold had good biocompatibility, under the electron microscope, the cells can be smoothly attached to and propagated on the scaffold. After loading the osteoblasts, it showed excellent osteogenic capacity in the rat model. The SF/BCP scaffold can highly simulate the micro-environment of natural bone formation and can meet the requirements of tissue engineering.

The SF/BCP biomimetic porous scaffold has excellent physical properties and biocompatibility. It can highly simulate the natural bone matrix composition and microenvironment, and can promote the adhesion and proliferation of osteoblasts. The SF/BCP scaffold has good ectopic osteogenesis after loading with osteoblasts, which can meet the requirements of scaffold materials in tissue engineering, and has broad application prospects in clinical application.

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Acknowledgements

The study was financially supported by the National Natural Science Foundation of China (81071450, 81371930).

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Author notes

  1. These authors contributed equally: Bin Liu, Xiyuan Gao.

Authors and Affiliations

  1. Department of Spine Surgery, Affiliated Hospital of Binzhou Medical University, No. 661, Huanghe 2nd Road, Shandong Province, Binzhou City, P. R. China

    Bin Liu, Xiyuan Gao, Zhaozhong Sun, Qingmin Fang, Xiaopeng Geng, Hanli Zhang, Guanglin Wang, Yongfeng Dou, Peng Hu, Kai Zhu, Dawei Wang, Jianqiang Xing, Dong Liu, Min Zhang & Rui Li

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  1. Bin Liu
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Liu, B., Gao, X., Sun, Z. et al. Biomimetic porous silk fibroin/biphasic calcium phosphate scaffold for bone tissue regeneration. J Mater Sci: Mater Med 30, 4 (2019). https://doi.org/10.1007/s10856-018-6208-4

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