Biomechanics of stretch-induced beading

Vladislav S. Markin, Darrell L. Tanelian, Ralph A. Jersild, Sidney Ochs

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Abstract

To account for the beading of myelinated fibers, and axons of unmyelinated nerve fibers as well of neurites of cultured dorsal root ganglia caused by mild stretching, a model is presented. In this model, membrane tension and hydrostatic pressure are the basic factors responsible for axonal constriction, which causes the movement of axonal fluid from the constricted regions into the adjoining axon, there giving rise to the beading expansions. Beading ranges from a mild undulation, with the smallest degree of stretch, to more globular expansions and narrow intervening constrictions as stretch is increased: the degree of constriction is physically limited by the compaction of the cytoskeleton within the axons. The model is a general one, encompassing the possibility that the membrane skeleton, composed mainly of spectrin and actin associated with the inner face of the axolemma, could be involved in bringing about the constrictions and beading.

Original languageEnglish (US)
Pages (from-to)2852-2860
Number of pages9
JournalBiophysical Journal
Volume76
Issue number5
DOIs
StatePublished - Jan 1 1999

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ASJC Scopus subject areas

  • Biophysics

Cite this

Markin, V. S., Tanelian, D. L., Jersild, R. A., & Ochs, S. (1999). Biomechanics of stretch-induced beading. Biophysical Journal, 76(5), 2852-2860. https://doi.org/10.1016/S0006-3495(99)77439-4