Strain-rate Dependency of Axonal Tolerance for Uniaxial Stretching

Authors: Hiromichi Nakadate, Evrim Kurtoglu, Hidenori Furukawa, Shoko Oikawa, and Shigeru Aomura—Graduate School of System Design, Tokyo Metropolitan University; Akira Kakuta—Advanced Course of Mechanical and Computer Systems Engineering, National Institute of Technology, Tokyo College; Yasuhiro Matsui—National Traffic Safety and Environment Laboratory

Abstract

This study aims to clarify the relation between axonal deformation and the onset of axonal injury. Firstly, to examine the influence of strain rate on the threshold for axonal injury, cultured neurons were subjected to 12 types of stretching (strains were 0.10, 0.15, and 0.20 and strain rates were 10, 30, 50, and 70 s^-1). The formation of axonal swellings and bulbs increased significantly at strain rates of 50 and 30 s^-1 with strains of 0.15 and 0.20, respectively, even though those formations did not depend on strain rates in cultures exposed to a strain of 0.10. Then, to examine the influence of the strain along an axon on axonal injury, swellings were measured at every axonal angle in the stretching direction. The axons that were parallel to stretching direction were injured the most. Finally, we proposed an experimental model that subjected an axon to more accurate strain. This model observed the process of axonal injury formation by detecting the same neuron before and after stretching. These results suggest that the strain-rate dependency of axonal tolerance is induced by a higher magnitude of loading strain and an experiment focusing on axonal strain is required for obtaining more detailed injury criteria for an axon.

Type: Full Paper

Keywords: Axonal injury, axonal swellings, axonal bulb, uniaxial stretching, strain, strain rate, tau protein, directional control of axonal elongation, axonal orientation

© Stapp Association, 2017

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