Irregular bone scaffolds fabricated using the Voronoi tessellation method resemble the morphology and properties of human cancellous bones.This has become a prominent topic in bone tissue engineering research in recen...Irregular bone scaffolds fabricated using the Voronoi tessellation method resemble the morphology and properties of human cancellous bones.This has become a prominent topic in bone tissue engineering research in recent years.However,studies on the radial-gradient design of irregular bionic scaffolds are limited.Therefore,this study aims to develop a radial-gradient structure similar to that of natural long bones,enhancing the development of bionic bone scaffolds.A novel gradient method was adopted to maintain constant porosity,control the seed site-specific distribution within the irregular porous structure,and vary the strut diameter to generate radial gradients.The irregular scaffolds were compared with four conventional scaffolds(cube,pillar BCC,vintiles,and diamond)in terms of permeability,stress concentration characteristics,and mechanical properties.The results indicate that the radial-gradient irregular porous structure boasts the widest permeability range and superior stress distribution compared to conventional scaffolds.With an elastic modulus ranging from 4.20 GPa to 22.96 GPa and a yield strength between 68.37 MPa and 149.40 MPa,it meets bone implant performance requirements and demonstrates significant application potential.展开更多
In bone tissue engineering microstructure design,adjusting the structural design of biomimetic bone scaffolds can provide distinct differentiation stimuli to cells on the scaffold surface.This study explored the biome...In bone tissue engineering microstructure design,adjusting the structural design of biomimetic bone scaffolds can provide distinct differentiation stimuli to cells on the scaffold surface.This study explored the biomechanical impacts of different biomimetic microstructures on advanced bone tissue engineering scaffolds.Two irregular bone scaffolds(homogeneous/radial gradient)based on the Voronoi tesselation algorithm and eight regular lattice scaffolds involving pillar body centered cubic,vintiles,diamond,and cube(homogeneous/radial gradient)with constant 80%porosity were constructed.Mechanical stimulation differentiation algorithms,finite element analysis,and computational fluid dynamics were used to investigate the effects of different pore structures on the octahedral shear strain and fluid flow shear stress within the scaffolds,thereby elucidating the differentiation capabilities of the five structural bone/cartilage cell types.The findings demonstrated that irregular structures and radial-gradient designs promoted osteogenic differentiation,whereas regular structures and homogeneous designs facilitated chondrogenic differentiation.The highest percentages of osteoblast and chondrocyte differentiation were observed in radial-gradient irregular scaffolds.This research provides insights into the microstructure design of bone tissue engineering implants.展开更多
以鲤肾脏组织RNA为模板,扩增并克隆鲤环指蛋白2(RING Finger Protein 2,RNF2)基因的CDS区全长,分析其组织表达谱。结果显示,鲤RNF2基因的CDS区序列长1011 bp,编码336个氨基酸;该基因与鲫、斑马鱼、金头鲷、海洋青鳉鱼、鳕鱼、非洲爪蟾...以鲤肾脏组织RNA为模板,扩增并克隆鲤环指蛋白2(RING Finger Protein 2,RNF2)基因的CDS区全长,分析其组织表达谱。结果显示,鲤RNF2基因的CDS区序列长1011 bp,编码336个氨基酸;该基因与鲫、斑马鱼、金头鲷、海洋青鳉鱼、鳕鱼、非洲爪蟾、尖尾娇鹟、小鼠、智人的同源性分别为98.2%、93.1%、78.0%、79.2%、79.2%、73.9%、78.1%、72.7%、72.7%;理化性质分析表明,RNF2蛋白分子质量为37.44 kD,理论等电点(pI)为6.28,脂肪系数为74.97%,不稳定指数为36.75,无跨膜结构和信号肽;亚细胞定位预测分析表明,该蛋白定位于细胞核(52.2%)、线粒体(26.1%)、细胞质(17.4%)和过氧化物酶体(4.3%)。蛋白质结构域分析表明该蛋白含RING结构域和RAWUL结构域,且RING结构域与斑马鱼、小鼠和智人完全一致;二级结构和三级结构表明,鲤鱼RNF2蛋白含有α-螺旋(35.12%)、延伸链(8.63%)、β-转角(0.89%)和无规则卷曲(55.36%);泛素化底物预测显示,TP53、IRF4、HIST2H2AC、H3F3B和HIST3H3作为RNF2蛋白的底物具有较高的置信度;实时荧光定量PCR结果显示,鲤RNF2基因在肌肉中表达量最高,其次是头肾和肝脏,在肾脏中表达量最低。这些结果为进一步研究RNF2在鲤鱼抗病毒应答中的作用提供了基础信息。展开更多
基金the National Natural Science Foundation of China(No.52165026)。
文摘Irregular bone scaffolds fabricated using the Voronoi tessellation method resemble the morphology and properties of human cancellous bones.This has become a prominent topic in bone tissue engineering research in recent years.However,studies on the radial-gradient design of irregular bionic scaffolds are limited.Therefore,this study aims to develop a radial-gradient structure similar to that of natural long bones,enhancing the development of bionic bone scaffolds.A novel gradient method was adopted to maintain constant porosity,control the seed site-specific distribution within the irregular porous structure,and vary the strut diameter to generate radial gradients.The irregular scaffolds were compared with four conventional scaffolds(cube,pillar BCC,vintiles,and diamond)in terms of permeability,stress concentration characteristics,and mechanical properties.The results indicate that the radial-gradient irregular porous structure boasts the widest permeability range and superior stress distribution compared to conventional scaffolds.With an elastic modulus ranging from 4.20 GPa to 22.96 GPa and a yield strength between 68.37 MPa and 149.40 MPa,it meets bone implant performance requirements and demonstrates significant application potential.
基金the National Natural Science Foundation of China(No.52165026)。
文摘In bone tissue engineering microstructure design,adjusting the structural design of biomimetic bone scaffolds can provide distinct differentiation stimuli to cells on the scaffold surface.This study explored the biomechanical impacts of different biomimetic microstructures on advanced bone tissue engineering scaffolds.Two irregular bone scaffolds(homogeneous/radial gradient)based on the Voronoi tesselation algorithm and eight regular lattice scaffolds involving pillar body centered cubic,vintiles,diamond,and cube(homogeneous/radial gradient)with constant 80%porosity were constructed.Mechanical stimulation differentiation algorithms,finite element analysis,and computational fluid dynamics were used to investigate the effects of different pore structures on the octahedral shear strain and fluid flow shear stress within the scaffolds,thereby elucidating the differentiation capabilities of the five structural bone/cartilage cell types.The findings demonstrated that irregular structures and radial-gradient designs promoted osteogenic differentiation,whereas regular structures and homogeneous designs facilitated chondrogenic differentiation.The highest percentages of osteoblast and chondrocyte differentiation were observed in radial-gradient irregular scaffolds.This research provides insights into the microstructure design of bone tissue engineering implants.
