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Physical understanding of axonal growth patterns on grooved substrates:groove ridge crossing versus longitudinal alignment

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Bio-Design and Manufacturing 2020年第4期3卷 348-360页

作者： Deming Zhang Hairui Suo Jin Qian Jun Yin Jianzhong Fu Yong Huang The State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310028China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310028China School of Automation Hangzhou Dianzi UniversityHangzhou 310018China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Department of Mechanical and Aerospace Engineering University of FloridaGainesvilleFL 32611USA

Surface topographies such as micrometric edges and grooves have been widely used to improve neuron ***,finding the mechanism of neuron–surface interactions on grooved substrates remains a *** this work,PC12 cells and chick forebrain neurons(CFNs)were cultured on grooved and smooth polyacrylonitrile *** was found that CFNs showed a tendency of growing across groove ridges;while PC12 cells were only observed to grow in the longitudinal direction of *** further investigate these observations,a 3D physical model of axonal outgrowth was *** this model,axon shafts are simulated as elastic 3D beams,accounting for the axon outgrowth as well as the focal contacts between axons and ***,the bending direction of axon tips during groove ridge crossing is governed by the energy minimization *** physical model predicts that axonal groove ridge crossing is contributed by the bending compliance of axons,caused by lower Young’s modulus and smaller *** work will aid the understanding of the mechanisms involved in axonal alignment and elongation of neurons guided by grooved substrates,and the obtained insights can be used to enhance the design of instructive scaffolds for nerve tissue engineering and regeneration applications.

关键词： grooved substrates Neuron outgrowth Axonal outgrowth model Axonal crossing

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