A new biomimetic bone tissue engineering scaffold material, nano-HAI PLGA-( PEG-Asp )n composite, was synthesized by a biologically inspired self-assembling approach. A novel biodegradable PLGA- ( PEG-Asp )n cop...A new biomimetic bone tissue engineering scaffold material, nano-HAI PLGA-( PEG-Asp )n composite, was synthesized by a biologically inspired self-assembling approach. A novel biodegradable PLGA- ( PEG-Asp )n copolymer with pendant amine functional groups and enhanced hydrophilicity woo synthesized by bulk ring-opening copolymerization by DL-lactide( DLLA) and glycolide( GA ) with Aspartic acid ( Asp )-Polyethylene glycol(PEG) alt-prepolymer. A Three-dimensional, porous scaffold of the PLGA-( PEG- Asp)n copolymer was fabricated by a solvent casting , particulate leaching process. The scaffold woo then incubated in modified simulated body fluid (naSBF). Growth of HA nanocrystals on the inner pore surfaces of the porous scaffold is confirmed by calcium ion binding analyses, SEM , mass increooe meoourements and quantification of phosphate content within scaffolds. SEM analysis demonstrated the nucleation and growth of a continuous bonelike, low crystalline carbonated HA nanocrystals on the inner pore surfaces of the PLGA- ( PEG-Asp )n scaffolds. The amount of calcium binding, total mass and the mass of phosphate on experimental PLGA- ( PEG-Asp ) n scaffolds at different incubation times in mSBF was significantly greater than that of control PLGA scaffolds. This nano-HA/ PLGA-( PEG- Asp )n composite stunts some features of natural bone both in main composition and hierarchical microstrueture. The Asp- PEG alt-prepolymer modified PleA copolymer provide a controllable high surface density and distribution of anionic functional groups which would enhance nucleation and growth of bonelike mineral following exposure to mSBF. This biomimetic treatment provides a simple method for surface functionalization and sabsequent mineral nucleation and self-oosembling on bodegradable polymer scaffolds for tissue engineering.展开更多
As a part of regenerative medicine, biomaterials are largely used in this field of nanotechnology and tissue engineering research. We have recently developed a new scaffold using electrospun nanofibers of Poly (ε-cap...As a part of regenerative medicine, biomaterials are largely used in this field of nanotechnology and tissue engineering research. We have recently developed a new scaffold using electrospun nanofibers of Poly (ε-caprolactone), PCL which is able to mimic the collagen extracellular matrix of cells. The aim of this study was to engineer a biological and implantable structure leading the regeneration of the tooth-bone unit. For this aim, we have cultured mouse osteoblasts embedded in a collagen gel on the nanofibrous membrane and coupled this structure with an embryonic dental germ before implantation. To follow bone and tooth regeneration, we have performed RT-PCR, histology and immunofluorescence analysis. We showed here that this leaving implantable structure represents an accurate strategy for bone-tooth unit regeneration. We report here the first demonstration of bone-tooth unit regeneration by using a strategy based on a synthetic nanostructured membrane. This electrospun membrane is manufactured by using an FDA approved polymer, PCL and functionalized with osteoblasts before incorporation of the tooth germs at ED14 (the first lower molars) to generate bone-tooth unit in vivo after implantation in mice. Our technology represents an excellent platform on which other sophisticated products could be based.展开更多
3D printing technology is an emerging technology.It constructs solid bodies by stacking materials layer by layer,and can quickly and accurately prepare bone tissue engineering scaffolds with specific shapes and struct...3D printing technology is an emerging technology.It constructs solid bodies by stacking materials layer by layer,and can quickly and accurately prepare bone tissue engineering scaffolds with specific shapes and structures to meet the needs of different patients.The field of life sciences has received a great deal of attention.However,different 3D printing technologies and materials have their advantages and disadvantages,and there are limitations in clinical application.In this paper,the technology,materials and clinical applications of 3D printed bone tissue engineering scaffolds are reviewed,and the future development trends and challenges in this field are prospected.展开更多
背景:如何修复骨缺损一直以来是临床难题,中药有效成分在骨修复方面具有良好的生物活性与治疗效果,将中药有效成分与组织工程材料相结合在骨修复领域具有广阔的前景。不同中药有效成分与支架的组合在作用关系方面具有相似之处。目的:搜...背景:如何修复骨缺损一直以来是临床难题,中药有效成分在骨修复方面具有良好的生物活性与治疗效果,将中药有效成分与组织工程材料相结合在骨修复领域具有广阔的前景。不同中药有效成分与支架的组合在作用关系方面具有相似之处。目的:搜集常见的中药有效成分与支架材料组合的案例,基于七情配伍的启发将组织工程支架与中药有效成分类比为产生配伍关系的两类中药,以二者的作用关系为纲进行归纳总结。方法:检索1998年1月至2024年1月Pub Med和中国知网数据库中发表的相关文献,英文检索词:“traditional Chinese medicine,Chinese medicine,traditional Chinese medicine monomers,bone defect,bone repair,bone tissue engineering,tissue engineering,scaffold”,中文检索词:“中药,中药有效成分,中药单体,骨组织工程,骨组织工程支架,支架,组织工程,骨缺损,骨修复”,最终纳入88篇文献进行综述分析。结果与结论:(1)组织工程支架材料与中药有效成分各自均在骨修复领域有广泛的运用,二者在成骨方面优势明显但仍有许多缺陷,许多研究致力于将二者制备成复合材料,希望通过二者间的相互作用发挥减毒增效作用。(2)一些药物与材料在成骨、抗菌、促血管生成方面能互相促进,增强原有的效果,受到传统方剂配伍观念的启发,文章将其归纳为“相须”关系,并举实例佐证。(3)一些药物能提高材料的强度,而某些材料能对负载于其上的药物实现缓释控释效果、增加载药量与稳定性,或是进行靶向递送,文章将这种单方面的提升效果归纳为“相使”关系。(4)一些中药与材料搭配使用能减少对方的毒副反应,文章将这种减毒关系归纳为“相畏相杀”。(5)文章得出了一个由七情配伍关系启发、基于作用关系分类的关于中药复合支架的全新视角,将中药传统观念引入组织工程领域,为后续复合支架的研究者提供新的研究思路,并在选材搭配方面提供一定的便利。展开更多
To investigate the osteoinductive and ectopicly osteogenic effects of a novel peptide P24 derived from bone morphogenetic protein 2 (BMP2), biodegradable collagen scaffolds (CS) were used to load BMP-2-derived pep...To investigate the osteoinductive and ectopicly osteogenic effects of a novel peptide P24 derived from bone morphogenetic protein 2 (BMP2), biodegradable collagen scaffolds (CS) were used to load BMP-2-derived peptide solutions with different concentrations (0.4 mg peptide/CS, 0.1 mg peptide/CS and pure CS, respectively), and the implants were implanted into muscular pockets on the back of Wistar rats. Radiographs and histological analysis were performed to evaluate the ectopic bone effects. Active ectopic bone formation was seen in both groups containing the peptide at different concentration (0.4 mg and 0.1 mg), whereas no bone formation and only fibrous tissue was seen in the pure CS group. The new bone formation induced by the peptide P24 displayed a dose-dependent and time-dependent efficiency. The new bone formation in the 0.4 mg peptide/CS group significantly increased than that of the 0.1 mg peptide/CS group. This novel BMP-2-derived peptide had excellent osteoinductive and ectopicly osteogenic properties which were similar to those of BMP2.展开更多
Objective:To investigate the effect of BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composite on repairing rat critical-sized cranial defects.Methods:The chitosan nanometer hydroxyapatit...Objective:To investigate the effect of BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composite on repairing rat critical-sized cranial defects.Methods:The chitosan nanometer hydroxyapatite collagen composite was prepared and the microcosmic appearance of the composite was observed by scanning electron microscope.The BMP-7 derived-peptide was introduced into the composite by vacuum adsorption.The released peptide content from the scaffold was detected using high performance liquid chromatography at different set times.Critical-sized cranial defects were created on both sides of the parietal bone in 24 adult Sprague-Dawley rats.The BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composites were implanted on the right side as experimental group and the left side was implanted with chitosan nanometer hydroxyapatite biomimetic collagen composites alone as control group.The rats of both groups were killed in batch respectively after 6 and 12 weeks.Macroscopic observation,three-dimensional reconstruction of computed tomography(CT)and histological observation were performed on these samples.Results:The results of scanning electron microscope showed that the surface of the scaffold was porous.The releasing character of BMP-7 derived-peptide belonged to slow release.The result of animal experiment showed that the BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composite could more effectively promote the repair of cranial bone defects comparing with the chitosan nanometer hydroxyapatite biomimetic collagen composite alone.The difference was statistically significant(p<.05).Conclusions:The BMP-7 derived-peptide chitosan nanometer hydroxyapatite collagen biomimetic composite can effectively promote bone regeneration of bone defects.The composite is a kind of ideal scaffold material for bone tissue engineering.展开更多
背景:股骨头坏死出现新月征是病情进程的“分水岭”,修复和稳定骨-软骨界面对阻止病情继续进展和预防股骨头塌陷尤为重要。利用组织工程学同步修复、整合骨-软骨界面具有潜在优势。目的:综述探讨解决股骨头坏死软骨下分离的潜在适宜技...背景:股骨头坏死出现新月征是病情进程的“分水岭”,修复和稳定骨-软骨界面对阻止病情继续进展和预防股骨头塌陷尤为重要。利用组织工程学同步修复、整合骨-软骨界面具有潜在优势。目的:综述探讨解决股骨头坏死软骨下分离的潜在适宜技术。方法:检索1970年1月至2023年4月PubMed、Web of Science及中国知网、万方数据库中发表的相关文献,英文检索词:“Femoral head necrosis,Avascular necrosis of femoral head,Osteonecrosis of femoral head”等,中文检索词:“股骨头坏死,软骨下骨,软骨,软骨与软骨下骨整合”等,最终纳入114篇文献进行综述分析。结果与结论:①结构缺陷、缺血缺氧环境、炎症因素和应力集中可能造成股骨头坏死软骨下分离现象,软骨下骨分离会造成塌陷进展,并且可能与保髋手术失败相关,利用组织工程支架实现支架与骨-软骨界面的整合是治疗股骨头坏死软骨下分离的潜在方法之一。②目前的文献研究表明,多相、梯度支架和复合材料在促进骨、软骨细胞黏附与增殖,骨软骨基质的沉积方面均有提升,有助于支架与骨-软骨界面的整合,对治疗股骨头坏死软骨下分离有参考价值。③通过对支架表面进行修饰可以提高与界面整合的效率,但有各自不同的优缺点,提供不同环境的支架能够诱导同种间充质干细胞差异分化,有助于不同界面之间的整合。④未来有望应用于股骨头坏死软骨下分离的支架应为复合材料,具有梯度化和差异化的仿生结构,通过表面修饰和干细胞加载促进骨-软骨界面与支架的整合以实现治疗目的,但仍需进一步研究验证,而支架的降解速率与修复进度同步和不同界面之间的稳定性是未来需要解决的主要问题。展开更多
文摘A new biomimetic bone tissue engineering scaffold material, nano-HAI PLGA-( PEG-Asp )n composite, was synthesized by a biologically inspired self-assembling approach. A novel biodegradable PLGA- ( PEG-Asp )n copolymer with pendant amine functional groups and enhanced hydrophilicity woo synthesized by bulk ring-opening copolymerization by DL-lactide( DLLA) and glycolide( GA ) with Aspartic acid ( Asp )-Polyethylene glycol(PEG) alt-prepolymer. A Three-dimensional, porous scaffold of the PLGA-( PEG- Asp)n copolymer was fabricated by a solvent casting , particulate leaching process. The scaffold woo then incubated in modified simulated body fluid (naSBF). Growth of HA nanocrystals on the inner pore surfaces of the porous scaffold is confirmed by calcium ion binding analyses, SEM , mass increooe meoourements and quantification of phosphate content within scaffolds. SEM analysis demonstrated the nucleation and growth of a continuous bonelike, low crystalline carbonated HA nanocrystals on the inner pore surfaces of the PLGA- ( PEG-Asp )n scaffolds. The amount of calcium binding, total mass and the mass of phosphate on experimental PLGA- ( PEG-Asp ) n scaffolds at different incubation times in mSBF was significantly greater than that of control PLGA scaffolds. This nano-HA/ PLGA-( PEG- Asp )n composite stunts some features of natural bone both in main composition and hierarchical microstrueture. The Asp- PEG alt-prepolymer modified PleA copolymer provide a controllable high surface density and distribution of anionic functional groups which would enhance nucleation and growth of bonelike mineral following exposure to mSBF. This biomimetic treatment provides a simple method for surface functionalization and sabsequent mineral nucleation and self-oosembling on bodegradable polymer scaffolds for tissue engineering.
文摘As a part of regenerative medicine, biomaterials are largely used in this field of nanotechnology and tissue engineering research. We have recently developed a new scaffold using electrospun nanofibers of Poly (ε-caprolactone), PCL which is able to mimic the collagen extracellular matrix of cells. The aim of this study was to engineer a biological and implantable structure leading the regeneration of the tooth-bone unit. For this aim, we have cultured mouse osteoblasts embedded in a collagen gel on the nanofibrous membrane and coupled this structure with an embryonic dental germ before implantation. To follow bone and tooth regeneration, we have performed RT-PCR, histology and immunofluorescence analysis. We showed here that this leaving implantable structure represents an accurate strategy for bone-tooth unit regeneration. We report here the first demonstration of bone-tooth unit regeneration by using a strategy based on a synthetic nanostructured membrane. This electrospun membrane is manufactured by using an FDA approved polymer, PCL and functionalized with osteoblasts before incorporation of the tooth germs at ED14 (the first lower molars) to generate bone-tooth unit in vivo after implantation in mice. Our technology represents an excellent platform on which other sophisticated products could be based.
基金funded by Versus Arthritis UK(Grant No.21977)European Commission via a H2020-MSCA-RISE programme(BAMOS,Grant No.734156)+1 种基金Innovative UK via Newton Fund(Grant No.102872)Engineering and Physical Science Research Council(EPSRC)via DTP CASE programme(Grant No.EP/T517793/1).
文摘3D printing technology is an emerging technology.It constructs solid bodies by stacking materials layer by layer,and can quickly and accurately prepare bone tissue engineering scaffolds with specific shapes and structures to meet the needs of different patients.The field of life sciences has received a great deal of attention.However,different 3D printing technologies and materials have their advantages and disadvantages,and there are limitations in clinical application.In this paper,the technology,materials and clinical applications of 3D printed bone tissue engineering scaffolds are reviewed,and the future development trends and challenges in this field are prospected.
文摘背景:如何修复骨缺损一直以来是临床难题,中药有效成分在骨修复方面具有良好的生物活性与治疗效果,将中药有效成分与组织工程材料相结合在骨修复领域具有广阔的前景。不同中药有效成分与支架的组合在作用关系方面具有相似之处。目的:搜集常见的中药有效成分与支架材料组合的案例,基于七情配伍的启发将组织工程支架与中药有效成分类比为产生配伍关系的两类中药,以二者的作用关系为纲进行归纳总结。方法:检索1998年1月至2024年1月Pub Med和中国知网数据库中发表的相关文献,英文检索词:“traditional Chinese medicine,Chinese medicine,traditional Chinese medicine monomers,bone defect,bone repair,bone tissue engineering,tissue engineering,scaffold”,中文检索词:“中药,中药有效成分,中药单体,骨组织工程,骨组织工程支架,支架,组织工程,骨缺损,骨修复”,最终纳入88篇文献进行综述分析。结果与结论:(1)组织工程支架材料与中药有效成分各自均在骨修复领域有广泛的运用,二者在成骨方面优势明显但仍有许多缺陷,许多研究致力于将二者制备成复合材料,希望通过二者间的相互作用发挥减毒增效作用。(2)一些药物与材料在成骨、抗菌、促血管生成方面能互相促进,增强原有的效果,受到传统方剂配伍观念的启发,文章将其归纳为“相须”关系,并举实例佐证。(3)一些药物能提高材料的强度,而某些材料能对负载于其上的药物实现缓释控释效果、增加载药量与稳定性,或是进行靶向递送,文章将这种单方面的提升效果归纳为“相使”关系。(4)一些中药与材料搭配使用能减少对方的毒副反应,文章将这种减毒关系归纳为“相畏相杀”。(5)文章得出了一个由七情配伍关系启发、基于作用关系分类的关于中药复合支架的全新视角,将中药传统观念引入组织工程领域,为后续复合支架的研究者提供新的研究思路,并在选材搭配方面提供一定的便利。
基金the National Natural Science Foundation of China(No.30200063,30070483,301070270)the Program for New Century Excellent Talents in University from the Ministry of Education of China,and the Excellent Youth Foundation of Wuhan Science and Technology Committee(No.20005006071-10)
文摘To investigate the osteoinductive and ectopicly osteogenic effects of a novel peptide P24 derived from bone morphogenetic protein 2 (BMP2), biodegradable collagen scaffolds (CS) were used to load BMP-2-derived peptide solutions with different concentrations (0.4 mg peptide/CS, 0.1 mg peptide/CS and pure CS, respectively), and the implants were implanted into muscular pockets on the back of Wistar rats. Radiographs and histological analysis were performed to evaluate the ectopic bone effects. Active ectopic bone formation was seen in both groups containing the peptide at different concentration (0.4 mg and 0.1 mg), whereas no bone formation and only fibrous tissue was seen in the pure CS group. The new bone formation induced by the peptide P24 displayed a dose-dependent and time-dependent efficiency. The new bone formation in the 0.4 mg peptide/CS group significantly increased than that of the 0.1 mg peptide/CS group. This novel BMP-2-derived peptide had excellent osteoinductive and ectopicly osteogenic properties which were similar to those of BMP2.
文摘Objective:To investigate the effect of BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composite on repairing rat critical-sized cranial defects.Methods:The chitosan nanometer hydroxyapatite collagen composite was prepared and the microcosmic appearance of the composite was observed by scanning electron microscope.The BMP-7 derived-peptide was introduced into the composite by vacuum adsorption.The released peptide content from the scaffold was detected using high performance liquid chromatography at different set times.Critical-sized cranial defects were created on both sides of the parietal bone in 24 adult Sprague-Dawley rats.The BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composites were implanted on the right side as experimental group and the left side was implanted with chitosan nanometer hydroxyapatite biomimetic collagen composites alone as control group.The rats of both groups were killed in batch respectively after 6 and 12 weeks.Macroscopic observation,three-dimensional reconstruction of computed tomography(CT)and histological observation were performed on these samples.Results:The results of scanning electron microscope showed that the surface of the scaffold was porous.The releasing character of BMP-7 derived-peptide belonged to slow release.The result of animal experiment showed that the BMP-7 derived-peptide chitosan nanometer hydroxyapatite biomimetic collagen composite could more effectively promote the repair of cranial bone defects comparing with the chitosan nanometer hydroxyapatite biomimetic collagen composite alone.The difference was statistically significant(p<.05).Conclusions:The BMP-7 derived-peptide chitosan nanometer hydroxyapatite collagen biomimetic composite can effectively promote bone regeneration of bone defects.The composite is a kind of ideal scaffold material for bone tissue engineering.
文摘背景:股骨头坏死出现新月征是病情进程的“分水岭”,修复和稳定骨-软骨界面对阻止病情继续进展和预防股骨头塌陷尤为重要。利用组织工程学同步修复、整合骨-软骨界面具有潜在优势。目的:综述探讨解决股骨头坏死软骨下分离的潜在适宜技术。方法:检索1970年1月至2023年4月PubMed、Web of Science及中国知网、万方数据库中发表的相关文献,英文检索词:“Femoral head necrosis,Avascular necrosis of femoral head,Osteonecrosis of femoral head”等,中文检索词:“股骨头坏死,软骨下骨,软骨,软骨与软骨下骨整合”等,最终纳入114篇文献进行综述分析。结果与结论:①结构缺陷、缺血缺氧环境、炎症因素和应力集中可能造成股骨头坏死软骨下分离现象,软骨下骨分离会造成塌陷进展,并且可能与保髋手术失败相关,利用组织工程支架实现支架与骨-软骨界面的整合是治疗股骨头坏死软骨下分离的潜在方法之一。②目前的文献研究表明,多相、梯度支架和复合材料在促进骨、软骨细胞黏附与增殖,骨软骨基质的沉积方面均有提升,有助于支架与骨-软骨界面的整合,对治疗股骨头坏死软骨下分离有参考价值。③通过对支架表面进行修饰可以提高与界面整合的效率,但有各自不同的优缺点,提供不同环境的支架能够诱导同种间充质干细胞差异分化,有助于不同界面之间的整合。④未来有望应用于股骨头坏死软骨下分离的支架应为复合材料,具有梯度化和差异化的仿生结构,通过表面修饰和干细胞加载促进骨-软骨界面与支架的整合以实现治疗目的,但仍需进一步研究验证,而支架的降解速率与修复进度同步和不同界面之间的稳定性是未来需要解决的主要问题。