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Published on: September 11, 2015
Thermodynamic 2D Silicene for Sequential and Multistage Bone Regeneration
Ni Ni1,2, Min Ge3,4, Rui Huang1,2
1Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, P. R. China.
Engineered nanoparticles (SNSs@AIPH) combined with near-infrared II (NIR-II) light promote bone healing by enhancing cell proliferation, blood vessel growth, and bone formation. This novel biomaterial strategy offers a promising approach for effective bone regeneration in critical-sized defects.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Nanotechnology
Background:
- Bone healing is complex, requiring cell recruitment, revascularization, and osteogenic differentiation.
- Critical-sized bone defects face challenges like insufficient osteoblasts, poor vascularization, and limited bone induction.
- Current strategies often struggle to address these limitations sequentially and efficiently.
Purpose of the Study:
- To design and engineer a novel 2D nanomaterial, SiO2-silicene@azobis(imidazolyl propane) (SNSs@AIPH), for sequential and efficient bone repair.
- To investigate the synergistic effects of SNSs@AIPH and near-infrared II (NIR-II) irradiation on bone healing processes.
- To evaluate the potential of this bionic-oriented strategy in bone tissue engineering.
Main Methods:
- Fabrication of 2D SiO2-silicene@azobis(imidazolyl propane) (SNSs@AIPH) nanoparticles.
- Utilizing controllable NIR-II irradiation to stimulate intracellular reactive oxygen species generation.
- Assessing the impact on bone marrow mesenchymal stem cells (BMSCs) proliferation, angiogenesis, and osteogenic differentiation in vitro.
- Evaluating bone repair efficacy in a rat cranial defect model.
Main Results:
- NIR-II irradiation of SNSs@AIPH significantly accelerated early BMSCs proliferation and angiogenesis.
- The engineered SNSs@AIPH nanoparticles demonstrated high biocompatibility and promoted BMSCs osteogenic differentiation by activating TGFβ and BMP pathways.
- In vivo studies showed enhanced BMSCs proliferation and vascularization, followed by significant osteogenic differentiation, leading to effective bone repair in rat cranial defects.
Conclusions:
- NIR-II-mediated SNSs@AIPH represents a promising bionic-oriented strategy for bone regeneration.
- This approach effectively addresses key limitations in bone healing, including cell availability, vascularization, and osteoinduction.
- The study broadens the perspective on applying cell-instructive biomaterials in bone tissue engineering.
