Piezoelectricity in native bones has been well recognized as the key factor in bone regeneration.Thus,bio-piezoelectric materials have gained substantial attention in repairing damaged bone by mimicking the tissue’s ...Piezoelectricity in native bones has been well recognized as the key factor in bone regeneration.Thus,bio-piezoelectric materials have gained substantial attention in repairing damaged bone by mimicking the tissue’s electrical microenvironment(EM).However,traditional manufacturing strategies still encounter limitations in creating personalized bio-piezoelectric scaffolds,hindering their clinical applications.Three-dimensional(3D)/four-dimensional(4D)printing technology based on the principle of layer-by-layer forming and stacking of discrete materials has demonstrated outstanding advantages in fabricating bio-piezoelectric scaffolds in a more complex-shaped structure.Notably,4D printing functionality-shifting bio-piezoelectric scaffolds can provide a time-dependent programmable tissue EM in response to external stimuli for bone regeneration.In this review,we first summarize the physicochemical properties of commonly used bio-piezoelectric materials(including polymers,ceramics,and their composites)and representative biological findings for bone regeneration.Then,we discuss the latest research advances in the 3D printing of bio-piezoelectric scaffolds in terms of feedstock selection,printing process,induction strategies,and potential applications.Besides,some related challenges such as feedstock scalability,printing resolution,stress-to-polarization conversion efficiency,and non-invasive induction ability after implantation have been put forward.Finally,we highlight the potential of shape/property/functionality-shifting smart 4D bio-piezoelectric scaffolds in bone tissue engineering(BTE).Taken together,this review emphasizes the appealing utility of 3D/4D printed biological piezoelectric scaffolds as next-generation BTE implants.展开更多
基金supported by grants from the National Natural Science Foundation of China(52205363)Fundamental Research Funds for the Central Universities(2019kfyRCPY044 and 2021GCRC002)+3 种基金Program for HUST Academic Frontier Youth Team(2018QYTD04)Program for Innovative Research Team of the Ministry of Education(IRT1244)Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park Project:HZQB-KCZYB-2020030the Guangdong Provincial Department of Science and Technology(Key-Area Research and Development Program of Guangdong Province)under the Grant 2020B090923002。
文摘Piezoelectricity in native bones has been well recognized as the key factor in bone regeneration.Thus,bio-piezoelectric materials have gained substantial attention in repairing damaged bone by mimicking the tissue’s electrical microenvironment(EM).However,traditional manufacturing strategies still encounter limitations in creating personalized bio-piezoelectric scaffolds,hindering their clinical applications.Three-dimensional(3D)/four-dimensional(4D)printing technology based on the principle of layer-by-layer forming and stacking of discrete materials has demonstrated outstanding advantages in fabricating bio-piezoelectric scaffolds in a more complex-shaped structure.Notably,4D printing functionality-shifting bio-piezoelectric scaffolds can provide a time-dependent programmable tissue EM in response to external stimuli for bone regeneration.In this review,we first summarize the physicochemical properties of commonly used bio-piezoelectric materials(including polymers,ceramics,and their composites)and representative biological findings for bone regeneration.Then,we discuss the latest research advances in the 3D printing of bio-piezoelectric scaffolds in terms of feedstock selection,printing process,induction strategies,and potential applications.Besides,some related challenges such as feedstock scalability,printing resolution,stress-to-polarization conversion efficiency,and non-invasive induction ability after implantation have been put forward.Finally,we highlight the potential of shape/property/functionality-shifting smart 4D bio-piezoelectric scaffolds in bone tissue engineering(BTE).Taken together,this review emphasizes the appealing utility of 3D/4D printed biological piezoelectric scaffolds as next-generation BTE implants.
文摘目的:观察内环境因素(pH和甘氨酸及离子浓度)对依达拉奉抗神经元缺血性损伤作用的影响。方法:大鼠原代培养皮质神经元,在不同的实验溶液(模拟缺血后脑内环境的变化)以缺氧缺糖(oxygen-g lucose deprivation,OGD)3 h和再灌12 h诱导皮质神经元损伤,以噻唑蓝(MTT)还原反应和乳酸脱氢酶(LDH)释放观察损伤变化。观察不同实验溶液对抗脑缺血药物依达拉奉抗缺血性损伤作用的影响。结果:在弱碱性(pH 7.8)或含甘氨酸(10μm o l/L)的实验溶液中,OGD损伤加重;在弱酸性(pH 6.5)或高M g2+(1.8 mm o l/L)条件下,OGD损伤减轻。依达拉奉(1μm o l/L)能逆转在pH 6.1、7.4、7.8或含甘氨酸溶液中OGD损伤;而对pH 6.5、高M g2+或低Ca2+溶液中的OGD损伤未显示保护作用。结论:内环境因素改变可影响缺血性损伤程度和依达拉奉抗损伤作用。
