Biomimetic Nanosilica-Collagen Scaffolds for In Situ Bone Regeneration: Toward a Cell-Free, One-Step Surgery.
Shao-Jie WangDong JiangZheng-Zheng ZhangYou-Rong ChenZheng-Dong YangJi-Ying ZhangJinjun ShiXing WangJia-Kuo YuPublished in: Advanced materials (Deerfield Beach, Fla.) (2019)
Current approaches to fabrication of nSC composites for bone tissue engineering (BTE) have limited capacity to achieve uniform surface functionalization while replicating the complex architecture and bioactivity of native bone, compromising application of these nanocomposites for in situ bone regeneration. A robust biosilicification strategy is reported to impart a uniform and stable osteoinductive surface to porous collagen scaffolds. The resultant nSC composites possess a native-bone-like porous structure and a nanosilica coating. The osteoinductivity of the nSC scaffolds is strongly dependent on the surface roughness and silicon content in the silica coating. Notably, without the use of exogenous cells and growth factors (GFs), the nSC scaffolds induce successful repair of a critical-sized calvarium defect in a rabbit model. It is revealed that topographic and chemical cues presented by nSC scaffolds could synergistically activate multiple signaling pathways related to mesenchymal stem cell recruitment and bone regeneration. Thus, this facile surface biosilicification approach could be valuable by enabling production of BTE scaffolds with large sizes, complex porous structures, and varied osteoinductivity. The nanosilica-functionalized scaffolds can be implanted via a cell/GF-free, one-step surgery for in situ bone regeneration, thus demonstrating high potential for clinical translation in treatment of massive bone defects.
Keyphrases
- tissue engineering
- bone regeneration
- cell free
- minimally invasive
- reduced graphene oxide
- mesenchymal stem cells
- induced apoptosis
- signaling pathway
- single cell
- high resolution
- epithelial mesenchymal transition
- gold nanoparticles
- mass spectrometry
- combination therapy
- surgical site infection
- pi k akt
- atrial fibrillation
- molecularly imprinted
- percutaneous coronary intervention
- walled carbon nanotubes