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Annals of Biomedical Engineering

, Volume 45, Issue 9, pp 2075–2087 | Cite as

Carbon Nanotube Reinforced Collagen/Hydroxyapatite Scaffolds Improve Bone Tissue Formation In Vitro and In Vivo

  • Zheng Jing
  • Yeke Wu
  • Wen Su
  • Mi Tian
  • Wenlu Jiang
  • Li Cao
  • Lixing ZhaoEmail author
  • Zhihe Zhao
Article

Abstract

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.

Keywords

Multi-walled carbon nanotube Osteogenesis Calvarial defect Bone regeneration Nanotechnology 

Notes

Acknowledgment

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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Copyright information

© Biomedical Engineering Society 2017

Authors and Affiliations

  • Zheng Jing
    • 1
  • Yeke Wu
    • 2
  • Wen Su
    • 3
  • Mi Tian
    • 4
  • Wenlu Jiang
    • 4
  • Li Cao
    • 1
  • Lixing Zhao
    • 4
    Email author
  • Zhihe Zhao
    • 4
  1. 1.Chongqing Key Laboratory of Oral Diseases and Biomedical Science, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher EducationStomatological Hospital of Chongqing Medical UniversityChongqingPeople’s Republic of China
  2. 2.Department of StomatologyAffiliated Hospital of Chengdu University of TCMChengduPeople’s Republic of China
  3. 3.National Engineering Research Center for BiomaterialsSichuan UniversityChengduPeople’s Republic of China
  4. 4.State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of StomatologySichuan UniversityChengduPeople’s Republic of China

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