Carbon Nanotube Reinforced Collagen/Hydroxyapatite Scaffolds Improve Bone Tissue Formation In Vitro and In Vivo
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Current bone regeneration strategies faced major challenges in fabricating the bionic scaffolds with nano-structure, constituents and mechanical features of native bone. In this study, we developed a new porous scaffold by adding the multi-walled carbon nanotube (MWCNT) into collagen (Col)/hydroxyapatite (HA) composites. Data showed that 0.5%CNT/Col/HA (0.5%CNT) group was approximately tenfolds stiffer than Col–HA, and it was superior in promoting bone marrow mesenchymal stem proliferation and spreading, mRNA and protein expressions of bone sialoprotein (BSP) and osteocalcin (OCN) than Col–HA group. Moreover, we utilized 0.5%CNT composite to repair the rat calvarial defects (8 mm diameter) in vivo, and observed the new bone formation by 3D reconstruction of micro CT, HE and Masson staining, and BSP, OCN by immunohistochemical analysis. Results showed that newly formed bone in 0.5%CNT group was significantly higher than that in Col–HA group at 12 weeks. These findings highlighted a promising strategy in healing of large area bone defect with MWCNT added into the Col–HA scaffold as they possessed the combined effects of mechanical strength and osteogenicity.
KeywordsMulti-walled carbon nanotube Osteogenesis Calvarial defect Bone regeneration Nanotechnology
This work was supported by grants from National Nature Science Foundation of China (Nos. 31271052, 31470904, 31670992), Sichuan Provincial Science and Technology Department Fund (No. 2013SZ0057), and Medical Scientific Research Projects of Chongqing Health Department (No. 2013-2-070), Program for Innovation Team Building at Institutions of Higher Education in Chongqing in 2016 (CXTDG201602006), and Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education.
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