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Enhancement of critical-sized bone defect regeneration by magnesium oxide-reinforced 3D scaffold with improved osteogenic and angiogenic properties

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Journal of Materials Science & Technology 2023年第4期135卷 186-198页

作者： Bo Chen Zhengjie Lin Qimanguli Saiding Yongcan Huang Yi Sun Xinyun Zhai Ziyu Ning Hai Liang Wei Qiao Binsheng Yu Kelvin W.K.Yeung Jie Shen Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint DiseasesShanghai Institute of Traumatology and OrthopaedicsRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China D Printing Clinical Translational and Regenerative Medicine Center Shenzhen Qianhai Shekou Free Trade Zone HospitalShenzhen 518067China Shenzhen Key Laboratory of Spine Surgery Department of Spine SurgeryPeking University Shenzhen HospitalShenzhen 518036China Department of Orthopaedics and Traumatology the University of Hong KongChina Hong Kong Special Administrative RegionChina Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma the University of Hong Kong Shenzhen HospitalShenzhen 518053China School of Materials Science and Engineering Nankai UniversityTianjin 300071China Department of Pathology Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China Department of Stomatology Shenzhen Qianhai Shekou Free Trade Zone HospitalShenzhen 518067China Applied Oral Sciences and Community Dental Care Faculty of Dentistrythe University of Hong KongChina Hong Kong Special Administrative RegionChina China Orthopaedic Regenerative Medicine Group(CORMed) Hangzhou 310000China

The healing of critical-sized bone defects(CSD)remains a challenge in orthopedic *** recent years,scaffolds with sophisticated microstructures fabricated by the emerging three-dimensional(3D)printing technology have lighted up the treatment of the CSD due to the elaborate microenvironments and support they may ***,we established a magnesium oxide-reinforced 3D-printed biocompos-ite scaffold to investigate the effect of magnesium-enriched 3D microenvironment on CSD *** composite was prepared using a biodegradable polymer matrix,polycaprolactone(PCL),and the disper-sion phase,magnesium oxide(MgO).With the appropriate surface treatment by saline coupling agent,the MgO dispersed homogeneously in the polymer matrix,leading to enhanced mechanical performance and steady release of magnesium ion(Mg^(2+))for superior cytocompatibility,higher cell viability,advanced osteogenic differentiation,and cell mineralization capabilities in comparison with the pure *** in-vivo femoral implantation and critical-sized cranial bone defect studies demonstrated the importance of the 3D magnesium microenvironment,as a scaffold that released appropriate Mg^(2+) exhibited remarkably increased bone volume,enhanced angiogenesis,and almost recovered CSD after 8-week ***,this study suggests that the magnesium-enriched 3D scaffold is a potential candidate for the treatment of CSD in a cell-free therapeutic approach.

关键词： 3D printing Magnesium critical-sized defect Bone regeneration Angiogenesis Scaffold

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Oxysterols as promising small molecules for bone tissue engineering: Systematic review

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World Journal of Orthopedics 2020年第7期11卷 328-344页

作者： Ethan Cottrill Julianna Lazzari Zach Pennington Jeff Ehresman Andrew Schilling Naomi Dirckx Nicholas Theodore Daniel Sciubba Timothy Witham Department of Neurosurgery The Johns Hopkins University School of MedicineBaltimoreMD 21287United States

BACKGROUND Bone tissue engineering is an area of continued interest within orthopaedic surgery,as it promises to create implantable bone substitute materials that obviate the need for autologous bone ***,oxysterols–oxygenated derivatives of cholesterol-have been proposed as a novel class of osteoinductive small molecules for bone tissue ***,we present the first systematic review of the in vivo evidence describing the potential therapeutic utility of oxysterols for bone tissue *** To systematically review the available literature examining the effect of oxysterols on in vivo bone *** We conducted a systematic review of the literature following PRISMA *** the PubMed/MEDLINE,Embase,and Web of Science databases,we queried all publications in the English-language literature investigating the effect of oxysterols on in vivo bone *** were screened for eligibility using PICOS criteria and assessed for potential bias using an expanded version of the SYRCLE Risk of Bias assessment *** full-text articles examining the effect of oxysterols on in vivo bone formation were *** data included:Animal species,surgical/defect model,description of therapeutic and control treatments,and method for assessing bone *** outcome was fusion rate for spinal fusion models and percent bone regeneration for critical-sized defect *** were tabulated and described by both surgical/defect model and oxysterol ***,data from all included studies were aggregated to posit the mechanism by which oxysterols may mediate in vivo bone *** Our search identified 267 unique articles,of which 27 underwent full-text *** studies(all preclinical)met our inclusion/exclusion *** the 13 included studies,5 employed spinal fusion models,2 employed critical-sized alveolar defect models,and 6 employed critical-sized calvarial defect *** upon SYRCLE c

关键词： Oxysterol Bone tissue engineering critical-sized defect Biomaterial Orthopaedic surgery Systematic review

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