Abstract
A 3D porous lamellar selenium-containing nano-hydroxyapatite (SeHAN)/chitosan (CS) biocomposite was synthesized. The selenium-containing hydroxyapatite (HA) grains of 150∼200 nm in length and 20∼30 nm in width were observed by dynamic light scattering and transmission electron microscopy. A combination of X-ray diffraction, Fourier-transform infrared spectroscopy, and SEM indicated that HA particles were uniformly dispersed in chitosan matrix and there was a chemical interaction between chitosan and HA. Then, a standard critical size calvarial bone defect was created in Wistar rats. In group 1, no implant was made in the defect. In groups 2 and 3, HA nanoparticles (HAN)/CS biocomposite and SeHAN/CS biocomposite were implanted into the defect, respectively. After 4 weeks, the histological assessment clearly exhibited no significant changes, only found some living cells anchored in the periphery of the implants. After 8 and 12 weeks, most newly formed osteoid tissue was found in the SeHAN/CS implant group. Additionally, the newly formed osteoid tissue, both at the edge and in the center of implants, was bioactive and neovascularized. Microfocus computerized tomography measurements also confirmed the much better quality of the newly formed bone tissue in SeHAN/CS implant group than that in HAN/CS implant group (p < 0.01). Collectively, the SeHAN/CS biocomposite, as a bioactive bone grafting substitute, significantly enhanced the repair of bone defect.
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Acknowledgments
Sincerely, we will thank Dr. Yu Teng from Union Hospital of the Huazhong University of Science and Technology for the construction of the bone defect model. This work was supported by the National Natural Science Foundation of China (grant nos. 81071263 and 30870624), National High-Technology Research and Development Program of China (grant nos. 2011AA030105 and 2012CB933601), and International Science and Technology Cooperation Program of China (grant no. 0102011DFA31430).
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Wang, Y., Lv, P., Ma, Z. et al. Enhanced Healing of Rat Calvarial Critical Size Defect with Selenium-Doped Lamellar Biocomposites. Biol Trace Elem Res 155, 72–81 (2013). https://doi.org/10.1007/s12011-013-9763-z
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DOI: https://doi.org/10.1007/s12011-013-9763-z